From 338f9a9659807eecb08e7e9cd3488d864da990a7 Mon Sep 17 00:00:00 2001 From: Arnaud Andre Date: Thu, 10 Sep 2015 00:45:29 +0200 Subject: [PATCH] Initializing uvrrpd repository --- COPYING | 675 +++++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 49 ++++ bits.h | 106 ++++++++ common.h | 205 +++++++++++++++ list.h | 424 +++++++++++++++++++++++++++++++ log.c | 87 +++++++ log.h | 158 ++++++++++++ uvrrpd.c | 199 +++++++++++++++ uvrrpd.h | 42 +++ vrrp.c | 121 +++++++++ vrrp.h | 119 +++++++++ vrrp_adv.c | 288 +++++++++++++++++++++ vrrp_adv.h | 79 ++++++ vrrp_arp.c | 197 +++++++++++++++ vrrp_arp.h | 29 +++ vrrp_exec.c | 236 +++++++++++++++++ vrrp_exec.h | 31 +++ vrrp_ip4.c | 245 ++++++++++++++++++ vrrp_ip6.c | 324 ++++++++++++++++++++++++ vrrp_ipx.h | 93 +++++++ vrrp_na.c | 241 ++++++++++++++++++ vrrp_na.h | 29 +++ vrrp_net.c | 544 +++++++++++++++++++++++++++++++++++++++ vrrp_net.h | 148 +++++++++++ vrrp_options.c | 250 ++++++++++++++++++ vrrp_options.h | 28 ++ vrrp_rfc.h | 54 ++++ vrrp_state.c | 320 +++++++++++++++++++++++ vrrp_state.h | 42 +++ vrrp_switch.sh | 62 +++++ vrrp_timer.c | 168 ++++++++++++ vrrp_timer.h | 75 ++++++ 32 files changed, 5668 insertions(+) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 bits.h create mode 100644 common.h create mode 100644 list.h create mode 100644 log.c create mode 100644 log.h create mode 100644 uvrrpd.c create mode 100644 uvrrpd.h create mode 100644 vrrp.c create mode 100644 vrrp.h create mode 100644 vrrp_adv.c create mode 100644 vrrp_adv.h create mode 100644 vrrp_arp.c create mode 100644 vrrp_arp.h create mode 100644 vrrp_exec.c create mode 100644 vrrp_exec.h create mode 100644 vrrp_ip4.c create mode 100644 vrrp_ip6.c create mode 100644 vrrp_ipx.h create mode 100644 vrrp_na.c create mode 100644 vrrp_na.h create mode 100644 vrrp_net.c create mode 100644 vrrp_net.h create mode 100644 vrrp_options.c create mode 100644 vrrp_options.h create mode 100644 vrrp_rfc.h create mode 100644 vrrp_state.c create mode 100644 vrrp_state.h create mode 100755 vrrp_switch.sh create mode 100644 vrrp_timer.c create mode 100644 vrrp_timer.h diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..10926e8 --- /dev/null +++ b/COPYING @@ -0,0 +1,675 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. + diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..0c9a3b7 --- /dev/null +++ b/Makefile @@ -0,0 +1,49 @@ +### Makefile +## simple makefile for dev purpose + + +TIME := $(shell date '+%D_%H:%M'| sed 's/\//\\\//g') + +CC := gcc + +CFLAGS += -std=gnu99 -D_GNU_SOURCE\ + -Wall -Wextra -Werror -Wbad-function-cast -Wshadow \ + -Wcast-qual -Wold-style-definition -Wmissing-noreturn \ + -Wstrict-prototypes -Waggregate-return -Wformat=2 \ + -Wundef -Wbad-function-cast -Wunused-parameter -Wnonnull +LDFLAGS += -lrt -Wall + +CFLAGS += -DPATH=\"$(shell pwd)\" + +ifdef DEBUG + CFLAGS += -g -ggdb -DDEBUG + LDFLAGS += +else + CFLAGS += #-Os -fomit-frame-pointer -DNDEBUG +endif + +# select C-files +sources := $(wildcard *.c) +headers := $(wildcard *.h) + +# Get objects from C-files +objects := $(sources:.c=.o) + +uvrrpd: $(objects) + +.PHONY: all +all: uvrrpd + + +INDENT_ARGS := -kr -i8 -c8 -nprs -nce -l80 -cp1 +.PHONY: indent +indent: + @echo "indent $(INDENT_ARGS)" + @indent $(INDENT_ARGS) $(sources) > /dev/null + @indent $(INDENT_ARGS) $(headers) > /dev/null + @find -name "*~" -delete + +.PHONY: clean +clean: + find -name "*.o" -delete + @rm -f uvrrpd diff --git a/bits.h b/bits.h new file mode 100644 index 0000000..a5be71f --- /dev/null +++ b/bits.h @@ -0,0 +1,106 @@ +/* + * bits.h + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _BITS_H_ +#define _BITS_H_ + +#include +#include +#include +#include +#include +#include + +/** + * BIT_MASK(nr) - bit mask + */ +#define BIT_MASK(nr) (1 << (nr)) + + +/** + * set_bit - Set a bit in memory + */ +static inline void set_bit(int nr, unsigned long *addr) +{ + *addr |= BIT_MASK(nr); +} + +/** + * clear_bit - Clear a bit in memory + */ +static inline void clear_bit(int nr, unsigned long *addr) +{ + *addr &= ~BIT_MASK(nr); +} + +/** + * change_bit - Toggle a bit in memory + */ +static inline void change_bit(int nr, unsigned long *addr) +{ + *addr ^= BIT_MASK(nr); +} + +/** + * test_and_set_bit - Set a bit and return its old value + */ +static inline int test_and_set_bit(int nr, unsigned long *addr) +{ + unsigned long mask = BIT_MASK(nr); + unsigned long old = *addr; + + *addr = old | mask; + return (old & mask) != 0; +} + +/** + * test_and_clear_bit - Clear a bit and return its old value + */ +static inline int test_and_clear_bit(int nr, unsigned long *addr) +{ + unsigned long mask = BIT_MASK(nr); + unsigned long old = *addr; + + *addr = old & ~mask; + return (old & mask) != 0; +} + +/** + * test_and_change_bit - Toggle a bit and return its old value + */ +static inline int test_and_change_bit(int nr, unsigned long *addr) +{ + unsigned long mask = BIT_MASK(nr); + unsigned long old = *addr; + + *addr = old ^ mask; + return (old & mask) != 0; +} + +/** + * test_bit - Determine whether a bit is set + */ +static inline int test_bit(int nr, const unsigned long *addr) +{ + return 1UL & (*addr >> nr); +} + +#endif /* _BITS_H_ */ diff --git a/common.h b/common.h new file mode 100644 index 0000000..ead19f7 --- /dev/null +++ b/common.h @@ -0,0 +1,205 @@ +/* + * common.h - common types and macros + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + + +#ifndef _COMMON_H_ +#define _COMMON_H_ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "log.h" + +/** + * bool - boolean type + */ +typedef enum { + FALSE, + TRUE +} bool; + +/** + * matches( s, c_str ) - Compare strings. + * s Data strings + * c_str C-Strings + */ +#define matches( s, c_str ) \ +({ \ + const char __dummy[] = c_str; \ + (void)(&__dummy); \ + ( memcmp ( s, c_str, sizeof( c_str ) ) == 0 ); \ +}) + +/** + * ARRAY_SIZE() + */ +#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0])) + + +/** + * cksum - compute IP checksum + */ +static inline int unsigned short cksum(unsigned short *buf, int nbytes) +{ + uint32_t sum; + uint16_t oddbyte; + + sum = 0; + while (nbytes > 1) { + sum += *buf++; + nbytes -= 2; + } + + if (nbytes == 1) { + oddbyte = 0; + *((uint16_t *) & oddbyte) = *(uint16_t *) buf; + sum += oddbyte; + } + + sum = (sum >> 16) + (sum & 0xffff); + sum += (sum >> 16); + + return (uint16_t) ~ sum; +} + +/** + * mystrtoul - convert a string to an unsigned long int + */ +static inline int mystrtoul(unsigned long *const dest, + const char *const str, unsigned long max) +{ + unsigned long val; + char *endptr; + + errno = 0; + val = strtoull(str, &endptr, 0); + + if ((val == 0 || val == LONG_MAX) && errno == ERANGE) + return -ERANGE; + + if (val > max) + return -ERANGE; + + if (*endptr != '\0') + return -EINVAL; + + *dest = val; + return 0; +} + +/** + * is_file_executable + */ +static inline int is_file_executable(const char *filename) +{ + struct stat sb; + + if (stat(filename, &sb) == -1) { + perror("stat"); + return 0; + } + + if (S_ISREG(sb.st_mode) && + (sb.st_mode & S_IRUSR) && (sb.st_mode & S_IXUSR)) + return 1; + + return 0; +} + + +#define IP4_NMASK 32 +#define IP6_NMASK 128 +/** + * split_ip_netmask() - split IPvX and netmask from a string + */ +static inline int split_ip_netmask(int family, + const char *str, void *addr, + uint8_t * netmask) +{ + char *tmp; + unsigned long ul; + + int netmask_length; + + /* IPv4 */ + if (family == AF_INET) + netmask_length = IP4_NMASK; + + /* IPv6 */ + if (family == AF_INET6) + netmask_length = IP6_NMASK; + + tmp = strstr(str, "/"); + *netmask = 0; + + if (tmp != NULL) { + *tmp = '\0'; + ++tmp; + if (mystrtoul(&ul, tmp, netmask_length) == -ERANGE) { + log_error("%s", "CIDR netmask out of range"); + return -ERANGE; + } + if (netmask != NULL) + *netmask = (uint8_t) ul; + } + + if (inet_pton(family, str, addr) == 0) { + log_error("inet_pton - %s", strerror(errno)); + return -1; + } + + return 0; +} + + +#ifdef DEBUG +/** + * print buf hexa + */ +static inline void print_buf_hexa(const char *str, void *buf, size_t x) +{ + uint8_t i; + int j = 0; + + unsigned char *pbuf = (unsigned char *) buf; + + printf("*** %s ***\n", str); + + for (i = 0; i < x; ++i, ++j) { + if (j == 4) { + printf("\n"); + j = 0; + } + if (j > 0) + printf(":"); + printf("%02X", pbuf[i]); + } + printf("\n"); +} +#endif + +#endif /* _COMMON_H_ */ diff --git a/list.h b/list.h new file mode 100644 index 0000000..5eb520d --- /dev/null +++ b/list.h @@ -0,0 +1,424 @@ +/** + * list.h Copied from the Linux kernel source tree + * + * Implement doubly linked list (list_head) + * + * Licensed under the GPL v2 as per the whole kernel source tree. + * + */ + +#ifndef _LIB_LIST_H_ +#define _LIB_LIST_H_ + + +#include + +/*! + * container_of - cast a member of a descriptor out to the containing descriptor + * + * @ptr: the pointer to the member. + * @type: the type of the container struct this is embedded in. + * @member: the name of the member within the struct. + * + */ +#define container_of(ptr, type, member) ({ \ + typeof( ((type *)0)->member ) *__mptr = (ptr); \ + (type *)( (char *)__mptr - offsetof(type,member) );}) + +/*! + * These are non-NULL pointers that will result in page faults + * under normal circumstances, used to verify that nobody uses + * non-initialized list entries. + */ +#define LIST_POISON1 ((void *) 0x00100100) +#define LIST_POISON2 ((void *) 0x00200200) + +/*! + * Simple doubly linked list implementation. + * + * Some of the internal functions ("__xxx") are useful when + * manipulating whole lists rather than single entries, as + * sometimes we already know the next/prev entries and we can + * generate better code by using them directly rather than + * using the generic single-entry routines. + */ + +struct list_head { + struct list_head *next, *prev; +}; + +#define LIST_HEAD_INIT(name) { &(name), &(name) } + +#define LIST_HEAD(name) \ + struct list_head name = LIST_HEAD_INIT(name) + +static inline void INIT_LIST_HEAD(struct list_head *list) +{ + list->next = list; + list->prev = list; +} + +/*! + * Insert a new entry between two known consecutive entries. + * + * This is only for internal list manipulation where we know + * the prev/next entries already! + */ +static inline void +__list_add(struct list_head *new, + struct list_head *prev, struct list_head *next) +{ + next->prev = new; + new->next = next; + new->prev = prev; + prev->next = new; +} + +/*! + * list_add - add a new entry + * @new: new entry to be added + * @head: list head to add it after + * + * Insert a new entry after the specified head. + * This is good for implementing stacks. + */ +static inline void list_add(struct list_head *new, struct list_head *head) +{ + __list_add(new, head, head->next); +} + +/*! + * list_add_tail - add a new entry + * @new: new entry to be added + * @head: list head to add it before + * + * Insert a new entry before the specified head. + * This is useful for implementing queues. + */ +static inline void list_add_tail(struct list_head *new, struct list_head *head) +{ + __list_add(new, head->prev, head); +} + +/*! + * Delete a list entry by making the prev/next entries + * point to each other. + * + * This is only for internal list manipulation where we know + * the prev/next entries already! + */ +static inline void __list_del(struct list_head *prev, struct list_head *next) +{ + next->prev = prev; + prev->next = next; +} + +/*! + * list_del - deletes entry from list. + * @entry: the element to delete from the list. + * Note: list_empty on entry does not return true after this, the entry is + * in an undefined state. + */ +static inline void list_del(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); + entry->next = LIST_POISON1; + entry->prev = LIST_POISON2; +} + +/*! + * list_del_init - deletes entry from list and reinitialize it. + * @entry: the element to delete from the list. + */ +static inline void list_del_init(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); + INIT_LIST_HEAD(entry); +} + +/** + * list_replace - replace old entry by new one + * @old : the element to be replaced + * @new : the new element to insert + * + * If @old was empty, it will be overwritten. + */ +static inline void list_replace(struct list_head *old, struct list_head *new) +{ + new->next = old->next; + new->next->prev = new; + new->prev = old->prev; + new->prev->next = new; +} + +static inline void +list_replace_init(struct list_head *old, struct list_head *new) +{ + list_replace(old, new); + INIT_LIST_HEAD(old); +} + +/*! + * list_swap - swap elements from list + * @a: the entry to move to a + * @b: the entry to move to b + */ +static inline void list_swap(struct list_head *a, struct list_head *b) +{ + if (a->next == b) { + list_replace(a, b); + list_add(b, a); + } + else if (a->prev == b) { + list_replace(b, a); + list_add(a, b); + } + else { + struct list_head tmp; + + tmp.next = b->next; + tmp.prev = b->prev; + list_replace(a, b); + list_replace(&tmp, a); + } +} + +/*! + * list_move - delete from one list and add as another's head + * @list: the entry to move + * @head: the head that will precede our entry + */ +static inline void list_move(struct list_head *list, struct list_head *head) +{ + __list_del(list->prev, list->next); + list_add(list, head); +} + +/*! + * list_move_tail - delete from one list and add as another's tail + * @list: the entry to move + * @head: the head that will follow our entry + */ +static inline void +list_move_tail(struct list_head *list, struct list_head *head) +{ + __list_del(list->prev, list->next); + list_add_tail(list, head); +} + +/** + * list_is_last - tests whether @list is the last entry in list @head + * @list: the entry to test + * @head: the head of the list + */ +static inline int +list_is_last(const struct list_head *list, const struct list_head *head) +{ + return list->next == head; +} + +/*! + * list_empty - tests whether a list is empty + * @head: the list to test. + */ +static inline int list_empty(struct list_head const *head) +{ + return head->next == head; +} + +static inline void __list_splice(struct list_head *list, struct list_head *head) +{ + struct list_head *first = list->next; + struct list_head *last = list->prev; + struct list_head *at = head->next; + + first->prev = head; + head->next = first; + + last->next = at; + at->prev = last; +} + +/*! + * list_splice - join two lists + * @list: the new list to add. + * @head: the place to add it in the first list. + */ +static inline void list_splice(struct list_head *list, struct list_head *head) +{ + if (!list_empty(list)) + __list_splice(list, head); +} + +/*! + * list_splice_init - join two lists and reinitialise the emptied list. + * @list: the new list to add. + * @head: the place to add it in the first list. + * + * The list at @list is reinitialised + */ +static inline void +list_splice_init(struct list_head *list, struct list_head *head) +{ + if (!list_empty(list)) { + __list_splice(list, head); + INIT_LIST_HEAD(list); + } +} + +/*! + * list_entry - get the struct for this entry + * @ptr: the &struct list_head pointer. + * @type: the type of the struct this is embedded in. + * @member: the name of the list_struct within the struct. + */ +#define list_entry(ptr, type, member) \ + container_of(ptr, type, member) + +/** + * list_first_entry - get the first element from a list + * @ptr: the list head to take the element from. + * @type: the type of the struct this is embedded in. + * @member: the name of the list_struct within the struct. + * + * Note, that list is expected to be not empty. + */ +#define list_first_entry(ptr, type, member) \ + list_entry((ptr)->next, type, member) + +/*! + * list_for_each - iterate over a list + * @pos: the &struct list_head to use as a loop counter. + * @head: the head for your list. + */ +#define list_for_each(pos, head) \ + for (pos = (head)->next; pos != (head); pos = pos->next) + +/*! + * list_for_each_prev - iterate over a list backwards + * @pos: the &struct list_head to use as a loop counter. + * @head: the head for your list. + */ +#define list_for_each_prev(pos, head) \ + for (pos = (head)->prev; pos != (head); pos = pos->prev) + +/*! + * list_for_each_safe - iterate over a list safe against removal of list entry + * @pos: the &struct list_head to use as a loop counter. + * @n: another &struct list_head to use as temporary storage + * @head: the head for your list. + */ +#define list_for_each_safe(pos, n, head) \ + for (pos = (head)->next, n = pos->next; pos != (head); \ + pos = n, n = pos->next) + +/*! + * list_for_each_entry - iterate over list of given type + * @pos: the type * to use as a loop counter. + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + */ +#define list_for_each_entry(pos, head, member) \ + for (pos = list_entry((head)->next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = list_entry(pos->member.next, typeof(*pos), member)) + +/*! + * list_for_each_entry_reverse - iterate backwards over list of given type. + * @pos: the type * to use as a loop counter. + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + */ +#define list_for_each_entry_reverse(pos, head, member) \ + for (pos = list_entry((head)->prev, typeof(*pos), member); \ + &pos->member != (head); \ + pos = list_entry(pos->member.prev, typeof(*pos), member)) + +/** + * list_for_each_entry_continue - continue iteration over list of given type + * @pos: the type * to use as a loop cursor. + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Continue to iterate over list of given type, continuing after + * the current position. + */ +#define list_for_each_entry_continue(pos, head, member) \ + for (pos = list_entry(pos->member.next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = list_entry(pos->member.next, typeof(*pos), member)) + +/** + * list_for_each_entry_from - iterate over list of given type from the current point + * @pos: the type * to use as a loop cursor. + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Iterate over list of given type, continuing from current position. + */ +#define list_for_each_entry_from(pos, head, member) \ + for (; &pos->member != (head); \ + pos = list_entry(pos->member.next, typeof(*pos), member)) + +/*! + * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry + * @pos: the type * to use as a loop counter. + * @n: another type * to use as temporary storage + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + */ +#define list_for_each_entry_safe(pos, n, head, member) \ + for (pos = list_entry((head)->next, typeof(*pos), member), \ + n = list_entry(pos->member.next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = n, n = list_entry(n->member.next, typeof(*n), member)) + +/** + * list_for_each_entry_safe_continue + * @pos: the type * to use as a loop cursor. + * @n: another type * to use as temporary storage + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Iterate over list of given type, continuing after current point, + * safe against removal of list entry. + */ +#define list_for_each_entry_safe_continue(pos, n, head, member) \ + for (pos = list_entry(pos->member.next, typeof(*pos), member), \ + n = list_entry(pos->member.next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = n, n = list_entry(n->member.next, typeof(*n), member)) + +/** + * list_for_each_entry_safe_from + * @pos: the type * to use as a loop cursor. + * @n: another type * to use as temporary storage + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Iterate over list of given type from current point, safe against + * removal of list entry. + */ +#define list_for_each_entry_safe_from(pos, n, head, member) \ + for (n = list_entry(pos->member.next, typeof(*pos), member); \ + &pos->member != (head); \ + pos = n, n = list_entry(n->member.next, typeof(*n), member)) + +/** + * list_for_each_entry_safe_reverse + * @pos: the type * to use as a loop cursor. + * @n: another type * to use as temporary storage + * @head: the head for your list. + * @member: the name of the list_struct within the struct. + * + * Iterate backwards over list of given type, safe against removal + * of list entry. + */ +#define list_for_each_entry_safe_reverse(pos, n, head, member) \ + for (pos = list_entry((head)->prev, typeof(*pos), member), \ + n = list_entry(pos->member.prev, typeof(*pos), member); \ + &pos->member != (head); \ + pos = n, n = list_entry(n->member.prev, typeof(*n), member)) + + +#endif /* _LIB_LIST_H_ */ diff --git a/log.c b/log.c new file mode 100644 index 0000000..f536952 --- /dev/null +++ b/log.c @@ -0,0 +1,87 @@ +/* + * log.c + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +/* ISO C */ +#include +#include +#include + +/* POSIX */ +#include + +#include "common.h" + +#ifdef DEBUG +int __log_trigger = LOG_DEBUG; +#else +int __log_trigger = LOG_NOTICE; +#endif + +int log_trigger(char const *level) +{ + /* + * LOG_ERR error conditions + * LOG_WARNING warning conditions + * LOG_NOTICE normal, but significant, condition + * LOG_INFO informational message + * LOG_DEBUG + */ + if (level == NULL) { + return __log_trigger; + } + else if (matches(level, "err")) { + __log_trigger = LOG_ERR; + } + else if (matches(level, "warning")) { + __log_trigger = LOG_WARNING; + } + else if (matches(level, "notice")) { + __log_trigger = LOG_NOTICE; + } + else if (matches(level, "info")) { + __log_trigger = LOG_INFO; + } + else if (matches(level, "debug")) { + __log_trigger = LOG_DEBUG; + } + + return __log_trigger; +} + +void log_open(char const *app, char const *level) +{ + openlog(app ? app : "-", LOG_PERROR | LOG_PID, LOG_DAEMON); + log_trigger(level); +} + +void log_close(void) +{ + closelog(); +} + +void log_it(int priority, char const *format, ...) +{ + va_list ap; + + va_start(ap, format); + vsyslog(priority, format, ap); + va_end(ap); +} diff --git a/log.h b/log.h new file mode 100644 index 0000000..6b7ae28 --- /dev/null +++ b/log.h @@ -0,0 +1,158 @@ +/* + * log.h + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _LOG_H_ +#define _LOG_H_ + + +/* ISO C */ +#include +#include + +/* POSIX */ +#include + +/** + * log_trigger (char const *level) + * Set up logs level trigger. If level is NULL return current level trigger + * - err Error conditions + * - warning Warning conditions + * - notice Normal, but significant, condition + * - info Informational message + * - debug Debug message + */ +int log_trigger(char const *level); + +/** + * log_open (char const *app, char const *level) + * Open logs system. Define logs level trigger. + * @app Application name + * @level Logs level + */ +void log_open(char const *app, char const *level); + +/** + * log_close( void ) + * Close logs system. + */ +void log_close(void); + +/** + * log_it( int priority, char const *format, ...) + * Log message if priority is higher than level trigger + * @priority Message + * @format Log message + * @... Arguments list + */ +void log_it(int priority, char const *format, ...) + __attribute__ ((__format__(__printf__, 2, 3))); + +/** + * log_error( fmt, ... ) + * @fmt Log message + * @... Arguments list + */ +#define log_error( fmt, ... ) \ +do { \ + log_it( LOG_ERR, "%s::%s "fmt, \ + "error", __func__, ##__VA_ARGS__ ); \ +} while ( 0 ) + +/** + * log_sys_error( fmt, ... ) + * @fmt Log message + * @... Arguments list + */ +#define log_sys_error( fmt, ... ) \ +do { \ + log_it( LOG_ERR, "%s::%s "fmt" %s", \ + "error", __func__, ##__VA_ARGS__, strerror(errno) ); \ +} while ( 0 ) + +/** + * log_warning( fmt, ... ) + * @fmt Log message + * @... Arguments list + */ +#define log_warning( fmt, ... ) \ +do { \ + log_it( LOG_WARNING, "%s::%s "fmt, \ + "warning", __func__, ##__VA_ARGS__ ); \ +} while ( 0 ) + +/** + * log_notice( ... ) + * @... Log message and arguments list + */ +#define log_notice( ... ) \ +do { \ + log_it( LOG_NOTICE, ##__VA_ARGS__ ); \ +} while ( 0 ) + +/** + * log_info( ... ) + * Log message. Enable in info or higher level + * @... Log message and arguments list + */ +#define log_info( ... ) \ +do { \ + extern int __log_trigger; \ + \ + if ( LOG_INFO <= __log_trigger ) \ + log_it( LOG_INFO, ##__VA_ARGS__ ); \ +} while ( 0 ) + +/** + * log_debug( fmt, ... ) + * Log message. Enable in debug level + * @fmt Log message + * @... Arguments list + */ +#define log_debug( fmt, ... ) \ +do { \ + extern int __log_trigger; \ + \ + if ( LOG_DEBUG <= __log_trigger ) \ + log_it( LOG_DEBUG, "%s %s "fmt, \ + "--- DEBUG ---", __func__, ##__VA_ARGS__ ); \ +} while ( 0 ) + +#ifdef DEBUG +/** + * log_devel( fmt, ... ) + * Log message. Enable in devel level + * @fmt Log message + * @... Arguments list + */ +#define log_devel( fmt, ... ) \ +do { \ + extern int __log_trigger; \ + \ + if ( LOG_DEBUG <= __log_trigger ) \ + log_it( LOG_DEBUG, "%s %s( " fmt " )", \ + "--- DEVEL ---", __func__, ##__VA_ARGS__ ); \ +} while ( 0 ) +#else +#define log_devel( fmt, ... ) +#endif /* DEBUG */ + + +#endif /* _LOG_H_ */ diff --git a/uvrrpd.c b/uvrrpd.c new file mode 100644 index 0000000..03e9e4c --- /dev/null +++ b/uvrrpd.c @@ -0,0 +1,199 @@ +/* + * uvrrpd.c - main entry point, server initialization + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#include +#include +#include +#include + +#include "uvrrpd.h" +#include "vrrp.h" +#include "vrrp_net.h" +#include "vrrp_adv.h" +#include "vrrp_arp.h" +#include "vrrp_na.h" +#include "vrrp_options.h" +#include "vrrp_exec.h" + +#include "log.h" + +unsigned long reg = 0UL; +int background = 1; +char *loglevel = NULL; + +static void signal_handler(int sig); +static void signal_setup(void); + +/** + * main() - entry point + * + * Declare VRRP instance, init daemon + * and launch state machine + */ +int main(int argc, char *argv[]) +{ + signal_setup(); + + /* Current VRRP instance */ + struct vrrp vrrp; + struct vrrp_net vnet; + + /* Init VRRP instance */ + vrrp_init(&vrrp); + vrrp_net_init(&vnet); + + /* cmdline options */ + if (! !vrrp_options(&vrrp, &vnet, argc, argv)) + exit(EXIT_FAILURE); + + /* open sockets */ + if ((vrrp_net_socket(&vnet) != 0) || (vrrp_net_socket_xmit(&vnet) != 0)) + exit(EXIT_FAILURE); + + /* hook script */ + if (vrrp_exec_init(&vrrp) != 0) + exit(EXIT_FAILURE); + + /* advertisement pkt */ + if (vrrp_adv_init(&vnet, &vrrp) != 0) + exit(EXIT_FAILURE); + + /* net topology */ + if (vnet.family == AF_INET) { + if (vrrp_arp_init(&vnet) != 0) + exit(EXIT_FAILURE); + } + else if (vnet.family == AF_INET6) { + if (vrrp_na_init(&vnet) != 0) + exit(EXIT_FAILURE); + } + + /* daemonize */ + log_open("uvrrpd", (char const *) loglevel); + if (background) { + daemon(0, (log_trigger(NULL) > LOG_INFO)); + } + else + chdir("/"); + + /* process */ + set_bit(KEEP_GOING, ®); + while (test_bit(KEEP_GOING, ®) && !vrrp_process(&vrrp, &vnet)); + + /* shutdown */ + vrrp_adv_cleanup(&vnet); + + if (vnet.family == AF_INET) + vrrp_arp_cleanup(&vnet); + + vrrp_cleanup(&vrrp); + vrrp_exec_cleanup(&vrrp); + vrrp_net_cleanup(&vnet); + + log_close(); + free(loglevel); + + return EXIT_SUCCESS; +} + + +/** + * signal_handler - Signal handler + */ +static void signal_handler(int sig) +{ + switch (sig) { + case SIGHUP: + log_notice("HUP to the init state"); + set_bit(UVRRPD_RELOAD, ®); + break; + + case SIGUSR1: + case SIGUSR2: + set_bit(UVRRPD_DUMP, ®); + break; + + case SIGPIPE: + log_notice("this is not a SIGPIPE"); + set_bit(UVRRPD_LOGOUT, ®); + break; + + case SIGINT: + case SIGTERM: + case SIGQUIT: + log_notice("%s - exit daemon", strsignal(sig)); + set_bit(UVRRPD_RELOAD, ®); + clear_bit(KEEP_GOING, ®); + break; + + case SIGCHLD: + /* bleh */ + break; + + default: + log_error("%s %d", strsignal(sig), sig); + break; + } +} + +/** + * signal_setup + * - register signal handler + * - SIGTERM: shutdown daemon + * - SIGHUP: reload daemon (switch to init state) + * - SIGCHLD: notify end of task (vrrp_exec()) + * - SIGUSR1: logs daemon context: vrrp_context() + * - SIGUSR2: todo, same as USR1 for the moment + * - SIGPIPE: socket write failure + * + * - blocked signal, unblocked them on select() syscall vrrp_process() + */ +static void signal_setup(void) +{ + struct sigaction sa; + + /* setup signal */ + memset(&sa, 0x00, sizeof(sa)); + sa.sa_handler = signal_handler; + sa.sa_flags = 0; + + sigaction(SIGINT, &sa, NULL); + sigaction(SIGTERM, &sa, NULL); + sigaction(SIGQUIT, &sa, NULL); + sigaction(SIGHUP, &sa, NULL); + sigaction(SIGCHLD, &sa, NULL); + sigaction(SIGUSR1, &sa, NULL); + sigaction(SIGUSR2, &sa, NULL); + sigaction(SIGALRM, &sa, NULL); + sigaction(SIGPIPE, &sa, NULL); + + /* setup signal mask */ + sigemptyset(&sa.sa_mask); + + sigaddset(&sa.sa_mask, SIGINT); + sigaddset(&sa.sa_mask, SIGTERM); + sigaddset(&sa.sa_mask, SIGQUIT); + sigaddset(&sa.sa_mask, SIGHUP); + sigaddset(&sa.sa_mask, SIGUSR1); + sigaddset(&sa.sa_mask, SIGUSR2); + + sigprocmask(SIG_BLOCK, &sa.sa_mask, NULL); +} diff --git a/uvrrpd.h b/uvrrpd.h new file mode 100644 index 0000000..ca8ea73 --- /dev/null +++ b/uvrrpd.h @@ -0,0 +1,42 @@ +/* + * uvrrpd.h + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _UVRRPD_H_ +#define _UVRRPD_H_ + +#include "bits.h" + +/** + * uvrrpd_control + * Enum server control register flags + */ +enum uvrrpd_control { + /* daemon keep going bit */ + KEEP_GOING = BIT_MASK(0), + /* daemon dump bit */ + UVRRPD_DUMP = BIT_MASK(1), + /* daemon logout bit */ + UVRRPD_LOGOUT = BIT_MASK(2), + /* daemon reload bit */ + UVRRPD_RELOAD = BIT_MASK(3), +}; + +#endif /* _UVRRPD_ */ diff --git a/vrrp.c b/vrrp.c new file mode 100644 index 0000000..8589b7f --- /dev/null +++ b/vrrp.c @@ -0,0 +1,121 @@ +/* + * vrrp.c - init VRRP instance and VRRP state functions + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#include + +#include "vrrp.h" +#include "vrrp_net.h" +#include "vrrp_state.h" + +#include "uvrrpd.h" +#include "bits.h" + +#include "log.h" + +extern unsigned long reg; + +/** + * vrrp_init() - init struct vrrp with default values + */ +void vrrp_init(struct vrrp *vrrp) +{ + /* VRRP version */ + vrrp->version = RFC3768; + + vrrp->vrid = 0; + vrrp->priority = PRIO_DFL; + vrrp->naddr = 0; + + /* auth */ + vrrp->auth_type = NOAUTH; + vrrp->auth_data = NULL; + + /* state */ + vrrp->state = INIT; + vrrp->preempt = PREEMPT_DFL; + + /* script */ + vrrp->scriptname = NULL; + vrrp->argv = NULL; + + /* timers */ + vrrp->adv_int = 0; + vrrp->master_adv_int = 0; + vrrp_timer_clear(&vrrp->adv_timer); + vrrp_timer_clear(&vrrp->masterdown_timer); +} + +/** + * vrrp_context() - dump vrrp info + */ +static void vrrp_context(struct vrrp *vrrp) +{ + log_notice("===================="); + log_notice("VRID %d", vrrp->vrid); + log_notice("current_state %s", STR_STATE(vrrp->state)); + log_notice("adv_int %d", vrrp->adv_int); + if (vrrp->version == RFC5798) + log_notice("master_adv_int %d", vrrp->master_adv_int); + log_notice("preempt %s", STR_PREEMPT(vrrp->preempt)); + log_notice("naddr %d", vrrp->naddr); + log_notice("===================="); +} + + +/** + * vrrp_process() - vrrp control and state machine + */ +int vrrp_process(struct vrrp *vrrp, struct vrrp_net *vnet) +{ + switch (vrrp->state) { + case INIT: + vrrp_state_init(vrrp, vnet); + break; + + case BACKUP: + vrrp_state_backup(vrrp, vnet); + break; + + case MASTER: + vrrp_state_master(vrrp, vnet); + break; + + default: + /* invalid state */ + return -ENOSYS; + break; + } + + if (test_and_clear_bit(UVRRPD_DUMP, ®)) + vrrp_context(vrrp); + + return 0; +} + + +/** + * vrrp_cleanup() - clean before exiting + */ +void vrrp_cleanup(struct vrrp *vrrp) +{ + free(vrrp->scriptname); + free(vrrp->auth_data); +} diff --git a/vrrp.h b/vrrp.h new file mode 100644 index 0000000..0c7a6de --- /dev/null +++ b/vrrp.h @@ -0,0 +1,119 @@ +/* + * vrrp.h - define main struct vrrp (VRRP instance) and some + * constants + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _VRRP_H_ +#define _VRRP_H_ + +#include + +#include "common.h" +#include "vrrp_net.h" +#include "vrrp_timer.h" +#include "vrrp_state.h" + +/* MAX values */ +#define VRID_MAX 255 +#define VRRP_PRIO_MAX 255 +#define ADVINT_MAX 4095 /* RFC5798 */ +#define PRIO_OWNER VRRP_PRIO_MAX + +/* DEFAULT values */ +#define PREEMPT_DFL TRUE +#define PRIO_DFL 100 + +/* External script */ +#define VRRP_SCRIPT PATH "/vrrp_switch.sh" +#define VRRP_SCRIPT_MAX sysconf(_SC_ARG_MAX) + +/* preemption */ +#define STR_PREEMPT(s) (s == TRUE ? "true" : "false") + +/** + * vrrp_version - VRRP version protocol + * @RFC2338 : VRRPv2 (deprecated) + * @RFC3768 : VRRPv2 + * @RFC5798 : VRRPv3 + */ +typedef enum { + RFC2338 = 2, + RFC3768 = 2, + RFC5798 = 3 +} vrrp_version; + +/** + * vrrp_authtype - Authentication type + * (from VRRPv2 / rfc2332) + */ +#define VRRP_AUTH_PASS_LEN 8 +typedef enum { + NOAUTH, + SIMPLE, + HMAC /* not supported */ +} vrrp_authtype; + +/** + * vrrp - Main structure defining VRRP instance + */ +struct vrrp { + vrrp_version version; /* VRRP version */ + uint8_t vrid; /* VRID 1 - 255 */ + uint8_t priority; /* PRIO 0 - 255 */ + uint8_t naddr; /* count ip addresses */ + + /* Advertisement interval + * + * VRRPv2 : + * - delay in s + * - default 1s + * - 8 bits field + * + * VRRPv3 : + * - delay in centisecond + * - default 100cs (1s) + * - 12 bits field + */ + uint16_t adv_int; + + /* Master advertisement interval + * only in VRRPv3 / rfc5798 + */ + uint16_t master_adv_int; + + vrrp_authtype auth_type; + char *auth_data; + + vrrp_state state; + bool preempt; + + char *scriptname; + char **argv; + + struct vrrp_timer adv_timer; + struct vrrp_timer masterdown_timer; +}; + +/* funcs */ +void vrrp_init(struct vrrp *vrrp); +void vrrp_cleanup(struct vrrp *vrrp); +int vrrp_process(struct vrrp *vrrp, struct vrrp_net *vnet); + +#endif /* _VRRP_H_ */ diff --git a/vrrp_adv.c b/vrrp_adv.c new file mode 100644 index 0000000..def1809 --- /dev/null +++ b/vrrp_adv.c @@ -0,0 +1,288 @@ +/* + * vrrp_adv.c - VRRP advertisement + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#include +#include +#include +#include // ETH_P_IP = 0x0800, ETH_P_IPV6 = 0x86DD +#include +#include +#include + +#include "log.h" +#include "vrrp.h" +#include "vrrp_net.h" +#include "vrrp_rfc.h" + +/* VRRP multicast group */ +#define INADDR_VRRP_GROUP 0xe0000012 /* 224.0.0.18 */ +#define IN6ADDR_VRRP_GROUP "FF02::12" + +#define ETHDR_SIZE sizeof(struct ether_header) + +#define VRRP_TYPE_ADV 1 + +/** + * ether_header vrrp_adv_eth - VRRP ethernet header + */ +static struct ether_header vrrp_adv_eth = { + .ether_dhost = {0x01, + 0x00, + 0x5e, + (INADDR_VRRP_GROUP >> 16) & 0x7F, + (INADDR_VRRP_GROUP >> 8) & 0xFF, + INADDR_VRRP_GROUP & 0xFF}, + .ether_shost = {0x00, + 0x00, + 0x5e, + 0x00, + 0x01, + 0x00}, /* vrrp->vrid */ +}; + +/** + * vrrp_adv_eth_build() - build VRRP adv ethernet header + */ +static int vrrp_adv_eth_build(struct iovec *iov, const uint8_t vrid, + const int family) +{ + iov->iov_base = malloc(sizeof(struct ether_header)); + struct ether_header *hdr = iov->iov_base; + + if (hdr == NULL) { + log_error("[%d] malloc: %s", vrid, strerror(errno)); + return -1; + } + + memcpy(hdr, &vrrp_adv_eth, sizeof(struct ether_header)); + hdr->ether_shost[5] = vrid; + if (family == AF_INET) + hdr->ether_type = htons(ETH_P_IP); + else /* AF_INET6 */ + hdr->ether_type = htons(ETH_P_IPV6); + + iov->iov_len = ETHDR_SIZE; + + return 0; +} + + +/** + * vrrp_adv_ip4_build() - build VRRP IPv4 advertisement + */ +static int vrrp_adv_ip4_build(struct iovec *iov, const struct vrrp_net *vnet) +{ + iov->iov_base = malloc(sizeof(struct iphdr)); + + struct iphdr *iph = iov->iov_base; + + if (iph == NULL) { + log_error("[%d] malloc: %s", vnet->vrid, strerror(errno)); + return -1; + } + + iph->ihl = 0x5; + iph->version = IPVERSION; + iph->tos = 0x00; + iph->tot_len = htons(IPHDR_SIZE + vnet->adv_getsize(vnet)); + iph->id = htons(0xdead); + iph->ttl = 0xff; /* VRRP_TTL */ + iph->frag_off = 0x00; + iph->protocol = IPPROTO_VRRP; + + iph->saddr = vnet->vif.ipx.addr.s_addr; + iph->daddr = htonl(INADDR_VRRP_GROUP); + + iph->check = cksum((unsigned short *) iph, IPHDR_SIZE); + + iov->iov_len = IPHDR_SIZE; + + return 0; +} + + +/** + * vrrp_adv_ip6_build() - build VRRP IPv6 advertisement + */ +static int vrrp_adv_ip6_build(struct iovec *iov, const struct vrrp_net *vnet) +{ + iov->iov_base = malloc(sizeof(struct ip6_hdr)); + + struct ip6_hdr *ip6h = iov->iov_base; + + if (ip6h == NULL) { + log_error("[%d] malloc: %s", vnet->vrid, strerror(errno)); + return -1; + } + + ip6h->ip6_flow = htonl((6 << 28) | (0 << 20) | 0); + ip6h->ip6_plen = htons(vnet->adv_getsize(vnet)); + ip6h->ip6_nxt = IPPROTO_VRRP; + ip6h->ip6_hlim = 0xff; /* VRRP_TTL */ + + memcpy(&ip6h->ip6_src, &vnet->vif.ip_addr6, sizeof(struct in6_addr)); + + if (inet_pton(AF_INET6, IN6ADDR_VRRP_GROUP, &(ip6h->ip6_dst)) != 1) { + log_error("[%d] inet_pton: %s", vnet->vrid, strerror(errno)); + return -1; + } + + iov->iov_len = sizeof(struct ip6_hdr); + + return 0; +} + + + +/** + * vrrp_net_adv_build() - build VRRP adv pkt + */ +static int vrrp_adv_build(struct iovec *iov, const struct vrrp_net *vnet, + const struct vrrp *vrrp) +{ + iov->iov_base = malloc(vnet->adv_getsize(vnet)); + + struct vrrphdr *pkt = iov->iov_base; + + if (pkt == NULL) { + log_error("[%d] malloc: %s", vnet->vrid, strerror(errno)); + return -1; + } + + pkt->version_type = (vrrp->version << 4) | VRRP_TYPE_ADV; + pkt->vrid = vnet->vrid; + pkt->priority = vrrp->priority; + pkt->naddr = vrrp->naddr; + if (vrrp->version == RFC3768) { + pkt->auth_type = vrrp->auth_type; + pkt->adv_int = vrrp->adv_int; + } + if (vrrp->version == RFC5798) { + pkt->max_adv_int = htons(vrrp->adv_int); + } + + /* write vrrp_ip addresses */ + uint32_t *vip_addr = + (uint32_t *) ((unsigned char *) pkt + VRRP_PKTHDR_SIZE); + + struct vrrp_ip *vip_ptr = NULL; + uint32_t pos = 0; + int naddr = 0; + + list_for_each_entry_reverse(vip_ptr, &vnet->vip_list, iplist) { + if (vnet->family == AF_INET) { + vip_addr[pos] = vip_ptr->ip_addr.s_addr; + ++pos; + } + else { /* AF_INET6 */ + memcpy(&vip_addr[pos], &vip_ptr->ip_addr6, + sizeof(struct in6_addr)); + pos += 4; + } + ++naddr; + if (naddr > vrrp->naddr) { + log_error + ("[%d] Build invalid avd pkt : try to write more vip than expected", + vnet->vrid); + return -1; + } + }; + + /* auth password */ + if ((vrrp->version == RFC2338) && (vrrp->auth_type == SIMPLE) + && (vrrp->auth_data != NULL)) { + uint32_t *auth_data = vip_addr + pos; + memcpy(auth_data, vrrp->auth_data, strlen(vrrp->auth_data)); + } + + /* chksum */ + pkt->chksum = vnet->adv_checksum(vnet, pkt, NULL, NULL); + + /* iov_len */ + iov->iov_len = vnet->adv_getsize(vnet); + + return 0; +} + +/** + * vrrp_adv_send() - send VRRP adv pkt + */ +int vrrp_adv_send(struct vrrp_net *vnet) +{ + return vrrp_net_send(vnet, vnet->__adv, ARRAY_SIZE(vnet->__adv)); +} + +/** + * vrrp_adv_send_zero() - send VRRP adv pkt with priority 0 + */ +int vrrp_adv_send_zero(struct vrrp_net *vnet) +{ + /* get adv buffer */ + struct iovec *iov = &vnet->__adv[2]; + struct vrrphdr *pkt = iov->iov_base; + + /* set priority to 0 and recompute checksum */ + uint8_t priority = pkt->priority; + pkt->priority = 0; + uint16_t chksum = pkt->chksum; + + /* chksum */ + + pkt->chksum = vnet->adv_checksum(vnet, pkt, NULL, NULL); + + /* send adv pkt */ + int ret = vrrp_net_send(vnet, vnet->__adv, ARRAY_SIZE(vnet->__adv)); + + /* restaure original priority and checksum */ + pkt->priority = priority; + pkt->chksum = chksum; + + return ret; +} + +/** + * vrrp_adv_init() - init advertisement pkt to send + */ +int vrrp_adv_init(struct vrrp_net *vnet, const struct vrrp *vrrp) +{ + int status = 0; + + status = vrrp_adv_eth_build(&vnet->__adv[0], vnet->vrid, vnet->family); + if (vnet->family == AF_INET) + status |= vrrp_adv_ip4_build(&vnet->__adv[1], vnet); + else + status |= vrrp_adv_ip6_build(&vnet->__adv[1], vnet); + status |= vrrp_adv_build(&vnet->__adv[2], vnet, vrrp); + + return status; +} + +/** + * vrrp_adv_cleanup() + */ +void vrrp_adv_cleanup(struct vrrp_net *vnet) +{ + /* clean iovec */ + for (int i = 0; i < 3; ++i) { + struct iovec *iov = &vnet->__adv[i]; + free(iov->iov_base); + } +} diff --git a/vrrp_adv.h b/vrrp_adv.h new file mode 100644 index 0000000..bbcc7fd --- /dev/null +++ b/vrrp_adv.h @@ -0,0 +1,79 @@ +/* + * vrrp_adv.h - VRRP advertisement + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _VRRP_ADV_H_ +#define _VRRP_ADV_H_ + + +int vrrp_adv_init(struct vrrp_net *vnet, const struct vrrp *vrrp); +void vrrp_adv_cleanup(struct vrrp_net *vnet); +int vrrp_adv_send(struct vrrp_net *vnet); +int vrrp_adv_send_zero(struct vrrp_net *vnet); +uint16_t vrrp_adv_chksum(struct vrrp_net *vnet, struct vrrphdr *pkt, + uint32_t saddr, uint32_t daddr); + +uint16_t vrrp_adv_ip6_chksum(struct vrrp_net *vnet, struct vrrphdr *pkt, + struct in6_addr *saddr, struct in6_addr *daddr); + +/** + * vrrp_adv_get_version() - get version_type from received adv pkt + */ +static inline int vrrp_adv_get_version(const struct vrrp_net *vnet) +{ + return vnet->__pkt.adv.version_type; +} + +/** + * vrrp_adv_get_priority() - get priority from received adv priority + */ +static inline int vrrp_adv_get_priority(const struct vrrp_net *vnet) +{ + return vnet->__pkt.adv.priority; +} + +/** + * vrrp_adv_get_ntoa_addr() - return a string ip4 address + */ +static inline char *vrrp_adv_get_ntoa_addr(const struct vrrp_net *vnet) +{ + return inet_ntoa(vnet->__pkt.ip_saddr); +} + +/** + * vrrp_adv_get_ntohl_addr() + */ +static inline uint32_t vrrp_adv_get_ntohl_addr(const struct vrrp_net *vnet) +{ + return ntohl(vnet->__pkt.ip_saddr.s_addr); +} + +/** + * vrrp_adv_get_advint() - get adv interval + */ +static inline uint16_t vrrp_adv_get_advint(const struct vrrp_net *vnet) +{ + if (vnet->__pkt.adv.version_type >> 4 == RFC5798) + return ntohs(vnet->__pkt.adv.max_adv_int); + + return vnet->__pkt.adv.adv_int; + +} +#endif /* _VRRP_ADV_H_ */ diff --git a/vrrp_arp.c b/vrrp_arp.c new file mode 100644 index 0000000..c765af4 --- /dev/null +++ b/vrrp_arp.c @@ -0,0 +1,197 @@ +/* + * vrrp_arp.c + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#include +#include +#include +#include // ETH_P_IP = 0x0800, ETH_P_IPV6 = 0x86DD +#include +#include +#include + +#include "log.h" +#include "vrrp.h" +#include "vrrp_net.h" + +#define ETHDR_SIZE sizeof(struct ether_header) + +/** + * ether_header vrrp_arp_eth + */ +static struct ether_header vrrp_arp_eth = { + .ether_dhost = {0xff, 0xff, 0xff, + 0xff, 0xff, 0xff}, + .ether_shost = {0x00, + 0x00, + 0x5e, + 0x00, + 0x01, + 0x00}, /* vrrp->vrid */ +}; + + +#define IP_ALEN 4 +/** + * arphdr_eth - ARP header + */ +struct arphdr_eth { + unsigned char ar_sha[ETH_ALEN]; /* Sender hardware address */ + unsigned char ar_sip[IP_ALEN]; /* Sender IP address */ + unsigned char ar_tha[ETH_ALEN]; /* Target hardware address */ + unsigned char ar_tip[IP_ALEN]; /* Target IP address */ +}; + + +/** + * vrrp_arp_eth_build() + */ +static int vrrp_arp_eth_build(struct iovec *iov, const uint8_t vrid) +{ + iov->iov_base = malloc(sizeof(struct ether_header)); + + struct ether_header *hdr = iov->iov_base; + + if (hdr == NULL) { + log_error("[%d] malloc: %s", vrid, strerror(errno)); + return -1; + } + + memcpy(hdr, &vrrp_arp_eth, sizeof(struct ether_header)); + + hdr->ether_shost[5] = vrid; + hdr->ether_type = htons(ETHERTYPE_ARP); + + iov->iov_len = ETHDR_SIZE; + + return 0; +} + +/** + * vrrp_arp_send() - Send arp gratuitous for each vip + */ +int vrrp_arp_send(struct vrrp_net *vnet) +{ + struct vrrp_ip *vip_ptr = NULL; + + /* we have to send one arp pkt by vip */ + list_for_each_entry_reverse(vip_ptr, &vnet->vip_list, iplist) { + vrrp_net_send(vnet, vip_ptr->__topology, + ARRAY_SIZE(vip_ptr->__topology)); + } + + return 0; +} + +/** + * vrrp_arp_build() - Build arp header + */ +static int vrrp_arp_build(struct iovec *iov, const uint8_t vrid) +{ + iov->iov_base = malloc(sizeof(struct arphdr)); + + struct arphdr *arph = iov->iov_base; + + if (arph == NULL) { + log_error("[%d] malloc: %s", vrid, strerror(errno)); + return -1; + } + + arph->ar_hrd = htons(ARPHRD_ETHER); /* Format of hardware address */ + arph->ar_pro = htons(ETHERTYPE_IP); /* Format of protocol address */ + arph->ar_hln = ETH_ALEN; /* Length of hardware address */ + arph->ar_pln = IP_ALEN; /* Length of protocol address */ + arph->ar_op = htons(ARPOP_REQUEST); /* ARP opcode (command) */ + + iov->iov_len = sizeof(struct arphdr); + + return 0; +} + +/** + * vrrp_arp_vrrp_build() - VRRP arp payload + */ +static int vrrp_arp_vrrp_build(struct iovec *iov, struct vrrp_ip *vip, + struct vrrp_net *vnet) +{ + iov->iov_base = malloc(sizeof(struct arphdr_eth)); + + struct arphdr_eth *arpeth = iov->iov_base; + + if (arpeth == NULL) { + log_error("[%d] malloc: %s", vnet->vrid, strerror(errno)); + return -1; + } + + arpeth->ar_sha[0] = 0x00; + arpeth->ar_sha[1] = 0x00; + arpeth->ar_sha[2] = 0x5e; + arpeth->ar_sha[3] = 0x00; + arpeth->ar_sha[4] = 0x01; + arpeth->ar_sha[5] = vnet->vrid; + + memcpy(arpeth->ar_sip, &vip->ip_addr.s_addr, IP_ALEN); + memset(arpeth->ar_tha, 0xFF, ETH_ALEN); + memcpy(arpeth->ar_tip, &arpeth->ar_sip, IP_ALEN); + + iov->iov_len = sizeof(struct arphdr_eth); + + return 0; +} + +/** + * vrrp_arp_init() + */ +int vrrp_arp_init(struct vrrp_net *vnet) +{ + int status = 0; + + /* we have to build one arp pkt by vip */ + struct vrrp_ip *vip_ptr = NULL; + + list_for_each_entry_reverse(vip_ptr, &vnet->vip_list, iplist) { + status = + vrrp_arp_eth_build(&vip_ptr->__topology[0], vnet->vrid); + status |= vrrp_arp_build(&vip_ptr->__topology[1], vnet->vrid); + status |= + vrrp_arp_vrrp_build(&vip_ptr->__topology[2], vip_ptr, vnet); + } + + return status; +} + +/** + * vrrp_arp_cleanup() + */ +void vrrp_arp_cleanup(struct vrrp_net *vnet) +{ + /* clean arp buffer for each vrrp_ip addr */ + struct vrrp_ip *vip_ptr = NULL; + + list_for_each_entry(vip_ptr, &vnet->vip_list, iplist) { + + /* clean iovec */ + for (int i = 0; i < 3; ++i) { + struct iovec *iov = &vip_ptr->__topology[i]; + free(iov->iov_base); + } + + } +} diff --git a/vrrp_arp.h b/vrrp_arp.h new file mode 100644 index 0000000..54f5304 --- /dev/null +++ b/vrrp_arp.h @@ -0,0 +1,29 @@ +/* + * vrrp_arp.h - ARP for VRRP IPv4 advertisement + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _VRRP_ARP_H_ +#define _VRRP_ARP_H_ + +int vrrp_arp_init(struct vrrp_net *vnet); +void vrrp_arp_cleanup(struct vrrp_net *vnet); +int vrrp_arp_send(struct vrrp_net *vnet); + +#endif /* _VRRP_ARP_H_ */ diff --git a/vrrp_exec.c b/vrrp_exec.c new file mode 100644 index 0000000..180d902 --- /dev/null +++ b/vrrp_exec.c @@ -0,0 +1,236 @@ +/* + * vrrp_exec.c - call an external script while changing state + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "vrrp.h" +#include "vrrp_exec.h" +#include "common.h" +#include "log.h" + +/* SCRIPT_ARG_MAX : bytes of args + * (255 IPv6 addresses might be specified) + * 1 IPv6 = 45 bytes in a string format + */ +#define SCRIPT_ARG_MAX INET6_ADDRSTRLEN * NI_MAXHOST +#define SCRIPT_NARGS 10 + +/** + * vrrp_build_args() - prepare args that will be passed to + * external script + * + * Build a argv array destined to execve() + */ +static int vrrp_build_args(const char *scriptname, char **argv, + const struct vrrp *vrrp, const struct vrrp_net *vnet, + vrrp_state state) +{ + /* get basename from scriptname */ + char *name = strchr(scriptname, '/'); + if (name != NULL) { + name++; + snprintf(argv[0], SCRIPT_ARG_MAX, "%s", name); + } + else + snprintf(argv[0], SCRIPT_ARG_MAX, "%s", scriptname); + + /* List of args passed to script : + * 1. state + * 2. vrid + * 3. ifname + * 4. priority + * 5. adv_int + * 6. naddr + * 7. family + * 8 & more. vipaddrs ... + */ + snprintf(argv[1], SCRIPT_ARG_MAX, "%s", STR_STATE(state)); + snprintf(argv[2], SCRIPT_ARG_MAX, "%d", vrrp->vrid); + snprintf(argv[3], SCRIPT_ARG_MAX, "%s", vnet->vif.ifname); + snprintf(argv[4], SCRIPT_ARG_MAX, "%d", vrrp->priority); + snprintf(argv[5], SCRIPT_ARG_MAX, "%d", vrrp->adv_int); + snprintf(argv[6], SCRIPT_ARG_MAX, "%d", vrrp->naddr); + snprintf(argv[7], SCRIPT_ARG_MAX, "%d", + (vnet->family == AF_INET ? 4 : 6)); + + /* serialize vipaddrs + * ip0,ip1,...,ipn */ + //argv[7] = '\0'; + int argv_ips = SCRIPT_NARGS - 2; + memset(argv[argv_ips], 0, strlen(argv[argv_ips])); + int plen = 0; + struct vrrp_ip *vip_ptr = NULL; + list_for_each_entry_reverse(vip_ptr, &vnet->vip_list, iplist) { + plen = strlen(argv[argv_ips]); + if (plen != 0) + argv[argv_ips][plen] = ','; + + if (vnet->family == AF_INET) + snprintf(argv[argv_ips] + strlen(argv[argv_ips]), + SCRIPT_ARG_MAX - plen + 1, "%s", + inet_ntoa(vip_ptr->ip_addr)); + + if (vnet->family == AF_INET6) { + char straddr[INET6_ADDRSTRLEN]; + snprintf(argv[argv_ips] + strlen(argv[argv_ips]), + SCRIPT_ARG_MAX - plen + 1, "%s", + inet_ntop(AF_INET6, &vip_ptr->ip_addr6, + straddr, INET6_ADDRSTRLEN)); + } + + } + + /* the last elmt must be NULL */ + argv[SCRIPT_NARGS - 1] = NULL; + + return 0; +} + +/** + * vrrp_exec() + */ +int vrrp_exec(struct vrrp *vrrp, const struct vrrp_net *vnet, vrrp_state state) +{ + const char *scriptname; + + if (vrrp->scriptname == NULL) + scriptname = VRRP_SCRIPT; + else + scriptname = vrrp->scriptname; + + if (!is_file_executable(scriptname)) { + log_error("File %s doesn't exist or is not executable", + scriptname); + return -1; + } + + vrrp_build_args(scriptname, vrrp->argv, vrrp, vnet, state); + + /* Sig gestion */ + sigset_t blockmask, origmask; + struct sigaction sa_ignore, sa_origquit, sa_origint, sa_default; + + sigemptyset(&blockmask); /* Block SIGCHLD */ + sigaddset(&blockmask, SIGCHLD); + sigprocmask(SIG_BLOCK, &blockmask, &origmask); + sa_ignore.sa_handler = SIG_IGN; /* Ignore SIGINT and SIGQUIT */ + sa_ignore.sa_flags = 0; + sigemptyset(&sa_ignore.sa_mask); + sigaction(SIGINT, &sa_ignore, &sa_origint); + sigaction(SIGQUIT, &sa_ignore, &sa_origquit); + + /* fork */ + pid_t child = fork(); + int status, savedErrno; + + if (child == -1) { + log_error("fork: %s", strerror(errno)); + vrrp_exec_cleanup(vrrp); + return -1; + } + + /* child */ + if (child == 0) { + sa_default.sa_handler = SIG_DFL; + sa_default.sa_flags = 0; + sigemptyset(&sa_default.sa_mask); + if (sa_origint.sa_handler != SIG_IGN) + sigaction(SIGINT, &sa_default, NULL); + if (sa_origquit.sa_handler != SIG_IGN) + sigaction(SIGQUIT, &sa_default, NULL); + sigprocmask(SIG_SETMASK, &origmask, NULL); + + /* execve */ + execve(scriptname, (char *const *) vrrp->argv, NULL); + + log_error("execve: %s", strerror(errno)); + vrrp_exec_cleanup(vrrp); + return -1; + } + + /* parent */ + if (child > 0) { + + while (waitpid(child, &status, 0) == -1) { + if (errno != EINTR) { /* Error other than EINTR */ + log_error("waitpid: %s", strerror(errno)); + status = -1; + break; /* So exit loop */ + } + } + } + + /* Unblock SIGCHLD, restore dispositions of SIGINT and SIGQUIT */ + savedErrno = errno; /* The following may change 'errno' */ + sigprocmask(SIG_SETMASK, &origmask, NULL); + sigaction(SIGINT, &sa_origint, NULL); + sigaction(SIGQUIT, &sa_origquit, NULL); + errno = savedErrno; + + return status; +} + +/** + * vrrp_exec_init() - init vrrp->argv buffer + */ +int vrrp_exec_init(struct vrrp *vrrp) +{ + vrrp->argv = malloc(sizeof(char *) * SCRIPT_NARGS); + + if (vrrp->argv == NULL) { + log_error("malloc: %s", strerror(errno)); + return -1; + } + + for (int i = 0; i < SCRIPT_NARGS - 1; ++i) { + vrrp->argv[i] = malloc(sizeof(char) * SCRIPT_ARG_MAX); + if (vrrp->argv[i] == NULL) { + log_error("malloc: %s", strerror(errno)); + return -1; + } + bzero(vrrp->argv[i], sizeof(char) * SCRIPT_ARG_MAX); + } + + return 0; +} + +/** + * vrrp_exec_cleanup() - cleanup vrrp->argv buffer + */ +void vrrp_exec_cleanup(struct vrrp *vrrp) +{ + if (vrrp->argv != NULL) { + for (int i = 0; i < SCRIPT_NARGS - 1; ++i) { + free(vrrp->argv[i]); + vrrp->argv[i] = NULL; + } + free(vrrp->argv); + vrrp->argv = NULL; + } +} diff --git a/vrrp_exec.h b/vrrp_exec.h new file mode 100644 index 0000000..5054b5e --- /dev/null +++ b/vrrp_exec.h @@ -0,0 +1,31 @@ +/* + * vrrp_exec.h - export prototype of vrrp_exec() + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _VRRP_EXEC_H_ +#define _VRRP_EXEC_H_ + +#include "vrrp.h" + +int vrrp_exec(struct vrrp *vrrp, const struct vrrp_net *vnet, vrrp_state state); +int vrrp_exec_init(struct vrrp *vrrp); +void vrrp_exec_cleanup(struct vrrp *vrrp); + +#endif /* _VRRP_EXEC_H_ */ diff --git a/vrrp_ip4.c b/vrrp_ip4.c new file mode 100644 index 0000000..9a454d6 --- /dev/null +++ b/vrrp_ip4.c @@ -0,0 +1,245 @@ +/* + * vrrp_ip4.c - IP4 helpers functions + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + + +#include +#include +#include +#include +#include +#include +#include +#include +#include +/* ifreq + ioctl */ +#include +#include +#include +#include + +#include "vrrp.h" +#include "vrrp_ipx.h" +#include "vrrp_net.h" +#include "vrrp_adv.h" +#include "log.h" +#include "common.h" + +#define VRRP_MGROUP4 "224.0.0.18" + +/** + * pshdr_ip4 - pseudo header IPv4 + */ +struct pshdr_ip4 { + uint32_t saddr; + uint32_t daddr; + uint8_t zero; + uint8_t protocol; + uint16_t len; +}; + +/** + * vrrp_ip4_search_vip() - search one vip in vip list + * if vip is found + * set found = 1 + * _vip_ptr point to vip in vnet->vip_list + */ +#define vrrp_ip4_search_vip(vnet, _vip_ptr, _addr, found) \ + do { \ + if (_addr != NULL) \ + list_for_each_entry_reverse(_vip_ptr, &vnet->vip_list, iplist) { \ + if ( _vip_ptr->ip_addr.s_addr == *_addr) {\ + found = 1; \ + break; \ + } \ + } \ + } while(0) + + +/** + * vrrp_ip4_mgroup() - join IPv4 VRRP multicast group + */ +static int vrrp_ip4_mgroup(struct vrrp_net *vnet) +{ + /* Join VRRP multicast group */ + struct ip_mreq group = { {0}, {0} }; + struct in_addr group_addr = { 0 }; + + if (inet_pton(AF_INET, VRRP_MGROUP4, &group_addr) < 0) { + log_error("vrid %d :: inet_pton - %s", vnet->vrid, + strerror(errno)); + return -1; + } + group.imr_multiaddr.s_addr = group_addr.s_addr; + group.imr_interface.s_addr = vnet->vif.ip_addr.s_addr; + + if (setsockopt + (vnet->socket, IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, + sizeof(struct ip_mreq)) < 0) { + log_error("vrid %d :: setsockopt - %s", vnet->vrid, + strerror(errno)); + return -1; + } + + return 0; +} + +/** + * vrrp_ip4_cmp() - Compare VIP list between received vrrpkt and our instance + * Return 0 if the list is the same, + * the number of different VIP else + */ +static int vrrp_ip4_cmp(struct vrrp_net *vnet, struct vrrphdr *vrrpkt) +{ + /* compare IP address(es) */ + uint32_t *vip_addr = + (uint32_t *) ((unsigned char *) vrrpkt + VRRP_PKTHDR_SIZE); + + uint32_t naddr = 0; + int ndiff = 0; + + for (naddr = 0; naddr < vnet->naddr; ++naddr) { + /* vip in vrrpkt */ + in_addr_t *addr = vip_addr + naddr; + + /* search in vrrp_ip list */ + struct vrrp_ip *vip_ptr = NULL; + int found = 0; + vrrp_ip4_search_vip(vnet, vip_ptr, addr, found); + + if (!found) { + log_warning + ("vrid %d :: Invalid pkt - Virtual IP address unexpected", + vnet->vrid); + ++ndiff; + } + } + return ndiff; +} + +/** + * vrrp_ip4_recv() - Fill vrrp_l3 header from received pkt + */ +static int vrrp_ip4_recv(int sock_fd, struct vrrp_recv *recv, + unsigned char *buf, ssize_t buf_size, int *payload_pos) +{ + ssize_t len; + struct iphdr *ip; + + len = read(sock_fd, buf, buf_size); + ip = (struct iphdr *) buf; + + recv->header.len = ip->ihl << 2; + recv->header.proto = ip->protocol; + recv->header.totlen = ntohs(ip->tot_len); + recv->header.ttl = ip->ttl; + + /* saddr and daddr of the ip header */ + recv->ip_saddr.s_addr = ip->saddr; + recv->ip_daddr.s_addr = ip->daddr; + + /* VRRP adv begin here */ + *payload_pos = recv->header.len; + + return len; +} + +/** + * vrrp_ip4_getsize() - return the current size of vrrp instance + */ +static int vrrp_ip4_getsize(const struct vrrp_net *vnet) +{ + return sizeof(struct vrrphdr) + vnet->naddr * sizeof(uint32_t) + + VRRP_AUTH_SIZE; +} + +/** + * vrrp_ip4_chksum() - compute vrrp adv chksum + */ +static uint16_t vrrp_ip4_chksum(const struct vrrp_net *vnet, + struct vrrphdr *pkt, + union vrrp_ipx_addr *ipx_saddr, + union vrrp_ipx_addr *ipx_daddr) +{ + /* reset chksum */ + pkt->chksum = 0; + + if ((pkt->version_type >> 4) == RFC3768) + return cksum((unsigned short *) pkt, vrrp_ip4_getsize(vnet)); + + if ((pkt->version_type >> 4) == RFC5798) { + const struct iovec *iov_iph = &vnet->__adv[1]; + const struct iphdr *iph = iov_iph->iov_base; + + /* get saddr and daddr */ + uint32_t saddr = 0; + uint32_t daddr = 0; + + if (ipx_saddr != NULL) + saddr = ipx_saddr->addr.s_addr; + if (ipx_daddr != NULL) + daddr = ipx_daddr->addr.s_addr; + + /* pseudo_header ipv4 */ + struct pshdr_ip4 psh = { 0 }; + + /* if saddr and daddr are not specified, use addresses from iphdr */ + psh.saddr = (saddr ? saddr : iph->saddr); + psh.daddr = (daddr ? daddr : iph->daddr); + psh.zero = 0; + psh.protocol = iph->protocol; + psh.len = htons(vrrp_ip4_getsize(vnet)); + + uint32_t psh_size = + sizeof(struct pshdr_ip4) + vrrp_ip4_getsize(vnet); + + unsigned short buf[psh_size / sizeof(short)]; + + memcpy(buf, &psh, sizeof(struct pshdr_ip4)); + memcpy(buf + sizeof(struct pshdr_ip4) / sizeof(short), pkt, + vrrp_ip4_getsize(vnet)); + + return cksum(buf, psh_size); + } + + return 0; +} + + +/** + * vrrp_ip4_setsockopt() - no need to setsockopt() in IPv4 + */ +static int vrrp_ip4_setsockopt( __attribute__ ((unused)) + int sock_fd, __attribute__ ((unused)) + int vrid) +{ + return 0; +} + +/* exported VRRP_IP4 helper */ +struct vrrp_ipx VRRP_IP4 = { + .family = AF_INET, + .setsockopt = vrrp_ip4_setsockopt, + .mgroup = vrrp_ip4_mgroup, + .cmp = vrrp_ip4_cmp, + .recv = vrrp_ip4_recv, + .chksum = vrrp_ip4_chksum, + .getsize = vrrp_ip4_getsize, +}; diff --git a/vrrp_ip6.c b/vrrp_ip6.c new file mode 100644 index 0000000..03de274 --- /dev/null +++ b/vrrp_ip6.c @@ -0,0 +1,324 @@ +/* + * vrrp_ip6.c - IPv6 helpers functions + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + + +#include +#include +#include +#include +#include +#include +#include +#include +#include +/* ifreq + ioctl */ +#include +#include +#include +#include +#include /* NI_MAXHOST */ + +#include "vrrp_ipx.h" +#include "vrrp_net.h" +#include "log.h" +#include "common.h" + +#define VRRP_MGROUP6 "ff02::12" +#define IP6HDR_SIZE sizeof(struct ip6_hdr) + +/** + * pshdr_ip6 - pseudo header IPv6 + */ +struct pshdr_ip6 { + struct in6_addr saddr; + struct in6_addr daddr; + uint32_t len; + uint8_t zeros[3]; + uint8_t next_header; +}; + +/** + * vrrp_ip6_search_vip() - search one vip in vip list + * if vip is found + * set found = 1 + * _vip_ptr point to vip in vnet->vip_list + */ +#define vrrp_ip6_search_vip(vnet, _vip_ptr, _addr, found) \ + do { \ + list_for_each_entry_reverse(_vip_ptr, &vnet->vip_list, iplist) { \ + if (memcmp(&(_vip_ptr->ip_addr6), _addr, sizeof(struct in6_addr)) == 0) { \ + found = 1; \ + break; \ + }\ + } \ + } while(0) + +/** + * vrrp_ip6_setsockopt() - Set socket option + * used to find ancillary data in recvmsg() + * see vrrp_ip6_recv() + */ +static int vrrp_ip6_setsockopt(int socket, int vrid) +{ + int on = 1; + + /* IPV6_RECVPKTINFO */ + if (setsockopt + (socket, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, sizeof(on)) < 0) { + log_error("vrid %d :: setsockopt - %s", vrid, strerror(errno)); + return -1; + } + + /* IPV6_RECVHOPLIMIT */ + if (setsockopt + (socket, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, sizeof(on)) < 0) { + log_error("vrid %d :: setsockopt - %s", vrid, strerror(errno)); + return -1; + } + + return 0; +} + +/** + * vrrp_net_join_mgroup6() - join IPv6 VRRP multicast group + */ +static int vrrp_ip6_mgroup(struct vrrp_net *vnet) +{ + /* Join VRRP multicast group */ + struct ipv6_mreq group = { IN6ADDR_ANY_INIT, 0 }; + struct in6_addr group_addr = IN6ADDR_ANY_INIT; + + if (inet_pton(AF_INET6, VRRP_MGROUP6, &group_addr) < 0) { + log_error("vrid %d :: inet_pton - %s", vnet->vrid, + strerror(errno)); + return -1; + } + + memcpy(&group.ipv6mr_multiaddr, &group_addr, sizeof(struct in6_addr)); + + group.ipv6mr_interface = if_nametoindex(vnet->vif.ifname); + + if (setsockopt + (vnet->socket, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &group, + sizeof(struct ipv6_mreq)) < 0) { + log_error("vrid %d :: setsockopt - %s", vnet->vrid, + strerror(errno)); + return -1; + } + + return 0; +} + + +/** + * vrrp_ip6_cmp() - Compare VIP list between received vrrpkt and our instance + * Return 0 if the list is the same, + * the number of differente VIP else + */ +static int vrrp_ip6_cmp(struct vrrp_net *vnet, struct vrrphdr *vrrpkt) +{ + uint32_t *vip_addr = + (uint32_t *) ((unsigned char *) vrrpkt + VRRP_PKTHDR_SIZE); + +#ifdef DEBUG + print_buf_hexa("vrrp_net_vip6_check vip_addr", vip_addr, + sizeof(struct in6_addr)); +#endif + + uint32_t pos = 0; + int naddr = 0; + int ndiff = 0; + + while (naddr < vnet->naddr) { + /* vip in vrrpkt */ + struct in6_addr *vip = (struct in6_addr *) (vip_addr + pos); + + /* search in vrrp_ip list */ + struct vrrp_ip *vip_ptr = NULL; + int found = 0; + + vrrp_ip6_search_vip(vnet, vip_ptr, vip->s6_addr, found); + + if (!found) { + char host[NI_MAXHOST]; + log_warning + ("vrid %d :: Invalid pkt - Virtual IPv6 address unexpected %s", + vnet->vrid, inet_ntop(vnet->family, vip, host, + sizeof(host))); + ++ndiff; + } + pos += 4; + ++naddr; + } + return ndiff; +} + +/** + * find_ancillary() - search & find IPv6 ancillary data after + * receiving data in a struct msghdr msg (recvmsg()) + */ +static inline void *find_ancillary(struct msghdr *msg, int cmsg_type) +{ + struct cmsghdr *cmsg = NULL; + + for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; + cmsg = CMSG_NXTHDR(msg, cmsg)) { + if ((cmsg->cmsg_level == IPPROTO_IPV6) + && (cmsg->cmsg_type == cmsg_type)) { + return (CMSG_DATA(cmsg)); + } + } + + return NULL; +} + +/** + * vrrp_ip6_recv() - Fill vrrp_ipx_header from received pkt + */ +static int vrrp_ip6_recv(int sock_fd, struct vrrp_recv *recv, + unsigned char *buf, ssize_t buf_size, int *payload_pos) +{ + ssize_t len; + + /* IPv6 raw sockets return no IP header. We must query + * src/dest via socket options/ancillary data */ + struct msghdr msg; + struct sockaddr_in6 src; + struct iovec iov; + uint8_t ancillary[64]; + + msg.msg_name = &src; + msg.msg_namelen = sizeof(src); + iov.iov_base = buf; + iov.iov_len = buf_size; + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = ancillary; + msg.msg_controllen = sizeof(ancillary); + msg.msg_flags = 0; + + len = recvmsg(sock_fd, &msg, 0); + + if (len < 0) { + log_error("recvmsg - %s", strerror(errno)); + return -1; + } + + /* SRC ADDRESS */ + memcpy(&recv->ip_saddr6, &src.sin6_addr, sizeof(struct in6_addr)); + + uint8_t *opt; + + /* HOPLIMIT */ + opt = find_ancillary(&msg, IPV6_HOPLIMIT); + if (opt == NULL) { + log_error("recvmsg - unknown hop limit"); + return -1; + } + + recv->header.ttl = *(int *) opt; + + /* DST ADDRESS */ + opt = find_ancillary(&msg, IPV6_PKTINFO); + if (opt == NULL) { + log_error("recvmsg - unknown dst address"); + return -1; + } + + struct in6_pktinfo *pktinfo = (struct in6_pktinfo *) opt; + + memcpy(&recv->ip_daddr6, &pktinfo->ipi6_addr, sizeof(struct in6_addr)); + + recv->header.len = sizeof(struct ip6_hdr); + recv->header.totlen = recv->header.len + len; + /* kludge, we force it since we have no way to read it in recvmsg() */ + recv->header.proto = IPPROTO_VRRP; + + /* buf is directly filled with VRRP adv + * no need to skip IPv6 header */ + *payload_pos = 0; + + return len; +} + +/** + * vrrp_ip6_getsize() - return the current size of vrrp instance + */ +static int vrrp_ip6_getsize(const struct vrrp_net *vnet) +{ + return sizeof(struct vrrphdr) + vnet->naddr * sizeof(struct in6_addr); +} + +/** + * vrrp_ip6_chksum() - compute VRRP adv chksum + */ +uint16_t vrrp_ip6_chksum(const struct vrrp_net *vnet, struct vrrphdr *pkt, + union vrrp_ipx_addr *ipx_saddr, + union vrrp_ipx_addr *ipx_daddr) +{ + /* reset chksum */ + pkt->chksum = 0; + + const struct iovec *iov_iph = &vnet->__adv[1]; + const struct ip6_hdr *iph = iov_iph->iov_base; + + /* pseudo_header ipv6 */ + struct pshdr_ip6 psh = { IN6ADDR_ANY_INIT, + IN6ADDR_ANY_INIT, + 0, + {0, 0, 0}, + 0 + }; + + if ((ipx_saddr != NULL) && (ipx_daddr != NULL)) { + memcpy(&psh.saddr, &ipx_saddr->addr6, sizeof(struct in6_addr)); + memcpy(&psh.daddr, &ipx_daddr->addr6, sizeof(struct in6_addr)); + } + else { + memcpy(&psh.saddr, &iph->ip6_src, sizeof(struct in6_addr)); + memcpy(&psh.daddr, &iph->ip6_dst, sizeof(struct in6_addr)); + } + + + bzero(&psh.zeros, sizeof(psh.zeros)); + psh.next_header = IPPROTO_VRRP; + psh.len = htons(vrrp_ip6_getsize(vnet)); + + uint32_t psh_size = sizeof(struct pshdr_ip6) + vrrp_ip6_getsize(vnet); + unsigned short buf[psh_size / sizeof(short)]; + + memcpy(buf, &psh, sizeof(struct pshdr_ip6)); + memcpy(buf + sizeof(struct pshdr_ip6) / sizeof(short), pkt, + vrrp_ip6_getsize(vnet)); + + return cksum(buf, psh_size); +} + +/* exported VRRP_IP6 helper */ +struct vrrp_ipx VRRP_IP6 = { + .family = AF_INET6, + .setsockopt = vrrp_ip6_setsockopt, + .mgroup = vrrp_ip6_mgroup, + .cmp = vrrp_ip6_cmp, + .recv = vrrp_ip6_recv, + .chksum = vrrp_ip6_chksum, + .getsize = vrrp_ip6_getsize, +}; diff --git a/vrrp_ipx.h b/vrrp_ipx.h new file mode 100644 index 0000000..dac198c --- /dev/null +++ b/vrrp_ipx.h @@ -0,0 +1,93 @@ +/** + * vrrp_ipx.h + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _VRRP_IPX_ +#define _VRRP_IPX_ + + +/* from vrrp_net.h */ +struct vrrp_net; +struct vrrphdr; +struct vrrp_recv; + +/** + * struct vrrp_ipx_header - IPvX header informations from received adv pkt + */ +struct vrrp_ipx_header { + int len; + int proto; + int totlen; + int ttl; +}; + +/** + * union vrrp_ipx_addr - IPv4 and IPv6 addr struct + */ +union vrrp_ipx_addr { + struct in_addr addr; + struct in6_addr addr6; +}; +#define ip_addr ipx.addr +#define ip_addr6 ipx.addr6 +#define ip_saddr s_ipx.addr +#define ip_daddr d_ipx.addr +#define ip_saddr6 s_ipx.addr6 +#define ip_daddr6 d_ipx.addr6 + +/** + * struct vrrp_ipx - Helper functions + */ +struct vrrp_ipx { + int family; + int (*setsockopt) (int, int); + int (*mgroup) (struct vrrp_net *); + int (*cmp) (struct vrrp_net *, struct vrrphdr *); + int (*recv) (int, struct vrrp_recv *, unsigned char *, ssize_t, int *); + uint16_t(*chksum) (const struct vrrp_net *, struct vrrphdr *, + union vrrp_ipx_addr *, union vrrp_ipx_addr *); + int (*getsize) (const struct vrrp_net *); +}; +#define set_sockopt ipx_helper->setsockopt +#define join_mgroup ipx_helper->mgroup +#define vip_compare ipx_helper->cmp +#define pkt_receive ipx_helper->recv +#define adv_checksum ipx_helper->chksum +#define adv_getsize ipx_helper->getsize + +extern struct vrrp_ipx VRRP_IP4; /* IPv4 module */ +extern struct vrrp_ipx VRRP_IP6; /* IPv6 module */ + +/** + * vrrp_ipx_set() - Set l3 helper for vrrp_net + */ +static inline struct vrrp_ipx *vrrp_ipx_set(int family) +{ + if (family == AF_INET) { + return &VRRP_IP4; + } + if (family == AF_INET6) { + return &VRRP_IP6; + } + + return NULL; +} + +#endif /* _VRRP_IPX_ */ diff --git a/vrrp_na.c b/vrrp_na.c new file mode 100644 index 0000000..9b2e839 --- /dev/null +++ b/vrrp_na.c @@ -0,0 +1,241 @@ +/* + * vrrp_na.c - Neighbour Advertisement + * + * TODO : need work to use chksum helper in vrrp_ip6.c + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include // struct nd_neighbor_advert + +#include "log.h" +#include "vrrp.h" +#include "vrrp_net.h" + +#define IN6ADDR_MCAST "ff02::1" + +#define ETHDR_SIZE sizeof(struct ether_header) +/** + * ether_header vrrp_na_eth + */ +static struct ether_header vrrp_na_eth = { + .ether_dhost = {0x33, 0x33, 0x00, + 0x00, 0x00, 0x01}, + .ether_shost = {0x00, + 0x00, + 0x52, + 0x00, + 0x01, + 0x00}, /* vrrp->vrid */ +}; + + +/** + * pshdr_ip6 - pseudo header IPv6 + */ +struct pshdr_ip6 { + struct in6_addr saddr; + struct in6_addr daddr; + uint32_t len; + uint8_t zeros[3]; + uint8_t next_header; +}; + +/** + * vrrp_na_eth_build() + */ +static int vrrp_na_eth_build(struct iovec *iov, const uint8_t vrid) +{ + iov->iov_base = malloc(sizeof(struct ether_header)); + + struct ether_header *hdr = iov->iov_base; + + if (hdr == NULL) { + log_error("[%d] malloc: %s", vrid, strerror(errno)); + return -1; + } + + memcpy(hdr, &vrrp_na_eth, sizeof(struct ether_header)); + + hdr->ether_shost[5] = vrid; + hdr->ether_type = htons(ETH_P_IPV6); + + iov->iov_len = ETHDR_SIZE; + + return 0; +} + +/** + * vrrp_na_ip6_build() + */ +static int vrrp_na_ip6_build(struct iovec *iov, struct vrrp_ip *ip, + const struct vrrp_net *vnet) +{ + iov->iov_base = malloc(sizeof(struct ip6_hdr)); + + struct ip6_hdr *ip6h = iov->iov_base; + + if (ip6h == NULL) { + log_error("[%d] malloc: %s", vnet->vrid, strerror(errno)); + return -1; + } + + ip6h->ip6_flow = htonl((6 << 28) | (0 << 20) | 0); + ip6h->ip6_plen = htons(sizeof(struct nd_neighbor_advert)); + ip6h->ip6_nxt = IPPROTO_ICMPV6; + ip6h->ip6_hlim = 0xff; + + memcpy(&ip6h->ip6_src, &ip->ip_addr6, sizeof(struct in6_addr)); + + if (inet_pton(AF_INET6, IN6ADDR_MCAST, &(ip6h->ip6_dst)) != 1) { + log_error("[%d] inet_pton: %s", vnet->vrid, strerror(errno)); + return -1; + } + + iov->iov_len = sizeof(struct ip6_hdr); + + return 0; +} + + +/** + * vrrp_na_chksum() - compute na chksum + */ +uint16_t vrrp_na_chksum(struct iovec * iov, struct nd_neighbor_advert * na) +{ + /* reset chksum */ + na->nd_na_hdr.icmp6_cksum = 0; + + const struct ip6_hdr *iph = iov->iov_base; + + /* pseudo_header ipv6 */ + struct pshdr_ip6 psh = { IN6ADDR_ANY_INIT, /* saddr */ + IN6ADDR_ANY_INIT, /* daddr */ + 0, /* length */ + {0, 0, 0}, /* zeros[3] */ + 0 /* next_header */ + }; + + memcpy(&psh.saddr, &iph->ip6_src, sizeof(struct in6_addr)); + memcpy(&psh.daddr, &iph->ip6_dst, sizeof(struct in6_addr)); + + bzero(&psh.zeros, sizeof(psh.zeros)); + psh.next_header = IPPROTO_ICMPV6; + psh.len = htons(sizeof(struct nd_neighbor_advert)); + + uint32_t psh_size = + sizeof(struct pshdr_ip6) + sizeof(struct nd_neighbor_advert); + unsigned short buf[psh_size / sizeof(short)]; + + memcpy(buf, &psh, sizeof(struct pshdr_ip6)); + memcpy(buf + sizeof(struct pshdr_ip6) / sizeof(short), na, + sizeof(struct nd_neighbor_advert)); + + return cksum(buf, psh_size); +} + +/** + * vrrp_na_build() + */ +static int vrrp_na_build(struct iovec *iov, struct vrrp_ip *ip, + const struct vrrp_net *vnet) +{ + iov->iov_base = malloc(sizeof(struct nd_neighbor_advert)); + + struct nd_neighbor_advert *na = iov->iov_base; + + if (na == NULL) { + log_error("[%d] malloc: %s", vnet->vrid, strerror(errno)); + return -1; + } + + na->nd_na_hdr.icmp6_type = ND_NEIGHBOR_ADVERT; + na->nd_na_hdr.icmp6_code = 0; + na->nd_na_hdr.icmp6_cksum = 0; + /* Set R/S/O flags as = R=1, S=0, O=1 (RFC 5798, 6.4.2.(395)) */ + na->nd_na_flags_reserved = ND_NA_FLAG_ROUTER | ND_NA_FLAG_OVERRIDE; + memcpy(&na->nd_na_target, &ip->ip_addr6, sizeof(struct in6_addr)); + + na->nd_na_hdr.icmp6_cksum = vrrp_na_chksum(&ip->__topology[1], na); + + iov->iov_len = sizeof(struct nd_neighbor_advert); + + return 0; +} + +/** + * vrrp_na_send() - for each vip send an unsollicited neighbor advertisement + */ +int vrrp_na_send(struct vrrp_net *vnet) +{ + struct vrrp_ip *vip_ptr = NULL; + + /* we have to send one na by vip */ + list_for_each_entry_reverse(vip_ptr, &vnet->vip_list, iplist) { + vrrp_net_send(vnet, vip_ptr->__topology, + ARRAY_SIZE(vip_ptr->__topology)); + } + + return 0; +} + +/** + * vrrp_na_init() + */ +int vrrp_na_init(struct vrrp_net *vnet) +{ + int status = 0; + + /* we have to build one na pkt by vip */ + struct vrrp_ip *vip_ptr = NULL; + + list_for_each_entry_reverse(vip_ptr, &vnet->vip_list, iplist) { + status = vrrp_na_eth_build(&vip_ptr->__topology[0], vnet->vrid); + status |= + vrrp_na_ip6_build(&vip_ptr->__topology[1], vip_ptr, vnet); + status |= vrrp_na_build(&vip_ptr->__topology[2], vip_ptr, vnet); + } + + return status; +} + + +/** + * vrrp_na_cleanup() + */ +void vrrp_na_cleanup(struct vrrp_net *vnet) +{ + /* clean na buffer for each vrrp_ip addr */ + struct vrrp_ip *vip_ptr = NULL; + + list_for_each_entry(vip_ptr, &vnet->vip_list, iplist) { + + /* clean iovec */ + for (int i = 0; i < 3; ++i) { + struct iovec *iov = &vip_ptr->__topology[i]; + free(iov->iov_base); + } + + } +} diff --git a/vrrp_na.h b/vrrp_na.h new file mode 100644 index 0000000..a61c4ca --- /dev/null +++ b/vrrp_na.h @@ -0,0 +1,29 @@ +/* + * vrrp_na.h - Neighbour Advertisement + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _VRRP_NA_H_ +#define _VRRP_NA_H_ + +int vrrp_na_init(struct vrrp_net *vnet); +void vrrp_na_cleanup(struct vrrp_net *vnet); +int vrrp_na_send(struct vrrp_net *vnet); + +#endif /* _VRRP_NA_H_ */ diff --git a/vrrp_net.c b/vrrp_net.c new file mode 100644 index 0000000..7bb9427 --- /dev/null +++ b/vrrp_net.c @@ -0,0 +1,544 @@ +/* + * vrrp_net.c - net layer + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +/* ifreq + ioctl */ +#include +#include +/* pselect() */ +#include +#include +#include +#include +#include /* NI_MAXHOST */ + +#include "vrrp.h" +#include "vrrp_net.h" +#include "vrrp_timer.h" +#include "vrrp_adv.h" + +#include "common.h" +#include "list.h" +#include "log.h" + +#include "linux/types.h" + + + + +#define VRRP_MGROUP4 "224.0.0.18" +#define VRRP_MGROUP6 "ff02::12" +#define VRRP_TTL 255 + +static inline void vrrp_net_invalidate_buffer(struct vrrp_net *vnet); + +/** + * vrrp_net_init() - init struct vrrp_net of vrrp instance + */ +void vrrp_net_init(struct vrrp_net *vnet) +{ + vnet->vrid = 0; + vnet->naddr = 0; + vnet->socket = 0; + vnet->xmit = 0; + vnet->family = AF_INET; + vnet->ipx_helper = NULL; + + /* init VRRP IPs list */ + INIT_LIST_HEAD(&vnet->vip_list); + + /* init vrrp interface */ + bzero((void *) &vnet->vif, sizeof(struct vrrp_if)); + + /* init pkt buffer */ + bzero((void *) &vnet->__pkt, sizeof(struct vrrp_recv)); +} + +/** + * vrrp_net_cleanup() - cleanup struct vrrp_net + */ +void vrrp_net_cleanup(struct vrrp_net *vnet) +{ + /* clean VIP addr */ + struct vrrp_ip *vip_ptr = NULL; + struct vrrp_ip *n = NULL; + list_for_each_entry_safe(vip_ptr, n, &vnet->vip_list, iplist) + free(vip_ptr); + + free(vnet->vif.ifname); + + /* close sockets */ + close(vnet->socket); + close(vnet->xmit); +} + +/** + * vrrp_net_socket() - create VRRP socket destined to receive VRRP pkt + */ +int vrrp_net_socket(struct vrrp_net *vnet) +{ + /* Open RAW socket */ + vnet->socket = socket(vnet->family, SOCK_RAW, IPPROTO_VRRP); + + if (vnet->socket < 0) { + log_error("vrid %d :: socket - %s", vnet->vrid, + strerror(errno)); + return -1; + } + + vnet->ipx_helper = vrrp_ipx_set(vnet->family); + + if (vnet->ipx_helper == NULL) { + log_error("family not valid"); + return -1; + } + + int status = -1; + + status = vnet->set_sockopt(vnet->socket, vnet->vrid); + status |= vnet->join_mgroup(vnet); + + return status; +} + +/** + * vrrp_net_socket_xmit() - open raw VRRP xmit socket + */ +int vrrp_net_socket_xmit(struct vrrp_net *vnet) +{ + vnet->xmit = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); + + if (vnet->xmit < 0) { + log_error("vrid %d :: socket xmit - %s", vnet->vrid, + strerror(errno)); + return -1; + } + + return 0; +} + + +/** + * vrrp_net_vif_getaddr() - get IPvX addr from a VRRP interface + */ +int vrrp_net_vif_getaddr(struct vrrp_net *vnet) +{ + + struct ifaddrs *ifaddr, *ifa; + int family; + + if (getifaddrs(&ifaddr) == -1) { + log_error("vrid %d :: getifaddrs - %s", vnet->vrid, + strerror(errno)); + return -1; + } + + /* search address */ + for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { + if (strcmp(ifa->ifa_name, vnet->vif.ifname) != 0) + continue; + + if (ifa->ifa_addr == NULL) + continue; + + family = ifa->ifa_addr->sa_family; + + if (family != vnet->family) + continue; + + if (vnet->family == AF_INET) { + vnet->vif.ip_addr.s_addr = + ((struct sockaddr_in *) ifa->ifa_addr)-> + sin_addr.s_addr; + } + else { /* AF_INET6 */ + struct sockaddr_in6 *src = + (struct sockaddr_in6 *) ifa->ifa_addr; + memcpy(&vnet->vif.ip_addr6, &src->sin6_addr, + sizeof(struct in6_addr)); + } + } + + freeifaddrs(ifaddr); + + vrrp_net_vif_mtu(vnet); + + return 0; +} + +/** + * vrrp_net_vif_mtu() - get MTU of vrrp interface + */ +int vrrp_net_vif_mtu(struct vrrp_net *vnet) +{ + struct ifreq ifr; + + strncpy(ifr.ifr_name, vnet->vif.ifname, IFNAMSIZ - 1); + + int fd = socket(AF_INET, SOCK_DGRAM, 0); + + ifr.ifr_addr.sa_family = AF_INET; + + if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) { + log_error("vrid %d :: ioctl - %s", vnet->vrid, strerror(errno)); + return -1; + } + + vnet->vif.mtu = ifr.ifr_mtu; + log_debug("%s mtu : %d", vnet->vif.ifname, vnet->vif.mtu); + + close(fd); + + return 0; +} + + +/** + * vrrp_net_vip_set() - register VRRP virtual IPvX addresses + */ +int vrrp_net_vip_set(struct vrrp_net *vnet, const char *ip) +{ + struct vrrp_ip *vip = malloc(sizeof(struct vrrp_ip)); + + if (vip == NULL) { + log_error("vrid %d :: malloc - %s", vnet->vrid, + strerror(errno)); + return -1; + } + + /* split ip / netmask */ + int status = -1; + + if (vnet->family == AF_INET) + status = + split_ip_netmask(vnet->family, ip, &vip->ip_addr, + &vip->netmask); + + if (vnet->family == AF_INET6) + status = + split_ip_netmask(vnet->family, ip, &vip->ip_addr6, + &vip->netmask); + + if (status != 0) { + fprintf(stderr, "vrid %d :: invalid IP addr %s", vnet->vrid, + ip); + free(vip); + return -1; + } + + list_add_tail(&vip->iplist, &vnet->vip_list); + + return 0; +} + +/** + * vrrp_net_listen() - Wait for a VRRP pkt on vnet->socket + * + * @return TIMER if current timer is expired + * @return PKT else + */ +int vrrp_net_listen(struct vrrp_net *vnet, struct vrrp *vrrp) +{ + struct vrrp_timer *vt; + + /* Check which timer is running + * Advertisement timer or Masterdown timer ? + */ + if (vrrp_timer_is_running(&vrrp->adv_timer)) { + log_debug("vrid %d :: adv_timer is running", vrrp->vrid); + vt = &vrrp->adv_timer; + } + else if (vrrp_timer_is_running(&vrrp->masterdown_timer)) { + log_debug("vrid %d :: masterdown_timer is running", vrrp->vrid); + vt = &vrrp->masterdown_timer; + } + else { /* No timer ? ... exit */ + log_error("vrid %d :: no timer running !", vrrp->vrid); + /* TODO die() */ + exit(EXIT_FAILURE); + } + + /* update timer before pselect() */ + if (vrrp_timer_update(vt)) { + log_debug("vrid %d :: timer expired before pselect", + vrrp->vrid); + /* timer expired or invalid */ + return TIMER; + } + + /* pselect */ + fd_set readfds; + FD_ZERO(&readfds); + FD_SET(vnet->socket, &readfds); + + sigset_t emptyset; + sigemptyset(&emptyset); + + /* Wait for packet or timer expiration */ + if (pselect + (vnet->socket + 1, &readfds, NULL, NULL, + (const struct timespec *) &vt->delta, &emptyset) >= 0) { + + + /* Timer is expired */ + if (vrrp_timer_is_expired(vt)) { + log_debug("vrid %d :: timer expired", vrrp->vrid); + return TIMER; + } + + /* Else we have received a pkt */ + log_debug("vrid %d :: VRRP pkt received", vrrp->vrid); + + /* check if received is valid or not */ + if (vrrp_net_recv(vnet, vrrp) > 0) + return PKT; + else { + log_error("vrid %d :: %s", vrrp->vrid, + "Received an invalid packet"); + return INVALID; + } + } + else { /* Signal or pselect error */ + if (errno == EINTR) { + log_debug("vrid %d :: signal caught", vrrp->vrid); + + return SIGNAL; + } + + log_error("vrid %d :: pselect - %s %d", vrrp->vrid, + strerror(errno), errno); + } + + return INVALID; +} + +/** + * vrrp_net_invalidate_buffer() + * invalidate internal buffer used to stock received pkt + * vnet->__pkt + */ +static inline void vrrp_net_invalidate_buffer(struct vrrp_net *vnet) +{ + vnet->__pkt.adv.version_type = 0; +} + +/** + * vrrp_net_recv() - read and check a received VRRP pkt advertisement + * + * @return len of VRRP pkt if valid, -1 if invalid + */ +int vrrp_net_recv(struct vrrp_net *vnet, const struct vrrp *vrrp) +{ + /* fetch pkt data received to buf */ + unsigned char buf[IP_MAXPACKET]; + + /* read IPvX header values and fill vrrp_recv buffer __pkt */ + int payload_pos = 0; + ssize_t len = vnet->pkt_receive(vnet->socket, &vnet->__pkt, buf, + IP_MAXPACKET, &payload_pos); + + /* check len */ + if (len == -1) { + log_error("vrid %d :: invalid pkt", vnet->vrid); + return INVALID; + } + + if ((len > vnet->vif.mtu) || (len < vnet->adv_getsize(vnet))) { + log_error("vrid %d :: invalid pkt len", vnet->vrid); + return INVALID; + } + + /* read and check vrrp advertisement pkt */ + struct vrrphdr *vrrpkt; + + vrrpkt = (struct vrrphdr *) (buf + payload_pos); + + /* TODO : is this really necessary ?? */ + vrrp_net_invalidate_buffer(vnet); + + /* check VRRP pkt size (including VRRP IP address(es) and Auth data) */ + unsigned int payload_size = + vnet->__pkt.header.totlen - vnet->__pkt.header.len; + + if ((payload_size < VRRP_PKT_MINSIZE) + || (payload_size > VRRP_PKT_MAXSIZE)) { + log_info + ("vrid %d :: Invalid pkt - Invalid packet size %d, expecting size between %ld and %ld", + vrrp->vrid, payload_size, VRRP_PKT_MINSIZE, + VRRP_PKT_MAXSIZE); + return INVALID; + } + + /* verify ip proto */ + if (vnet->__pkt.header.proto != IPPROTO_VRRP) { + log_info("vrid %d :: Invalid pkt - ip proto not valid %d", + vrrp->vrid, vnet->__pkt.header.proto); + return INVALID; + } + + /* verify VRRP version */ + if ((vrrpkt->version_type >> 4) != vrrp->version) { + log_info + ("vrid %d :: Invalid pkt - version %d mismatch, expecting %d", + vrrp->vrid, vrrpkt->version_type >> 4, vrrp->version); + return INVALID; + } + + /* TTL must be 255 */ + if (vnet->__pkt.header.ttl != VRRP_TTL) { + log_info("vrid %d :: Invalid pkt - TTL isn't %d", vrrp->vrid, + VRRP_TTL); + return INVALID; + } + + /* verify VRRP checksum */ + int chksum = vrrpkt->chksum; /* save checksum */ + if (vnet->adv_checksum(vnet, vrrpkt, &vnet->__pkt.s_ipx, + &vnet->__pkt.d_ipx) != chksum) { + log_info("vrid %d :: Invalid pkt - Invalid checksum %x", + vrrp->vrid, chksum); + + return INVALID; + } + /* restore checksum */ + vrrpkt->chksum = chksum; + + /* check if VRID is the same as the current instance */ + if (vrrpkt->vrid != vrrp->vrid) { + log_info("vrid %d :: Invalid pkt - Invalid VRID %d", + vrrp->vrid, vrrpkt->vrid); + return INVALID; + } + + /* local router is the IP address owner + * (Priority equals 255) + */ + if (vrrp->priority == PRIO_OWNER) { + log_info + ("vrid %d :: Invalid pkt - *We* are the owner of IP address(es) (priority %d)", + vrrp->vrid, vrrp->priority); + return INVALID; + } + + + /* Auth type (RFC2338/3768) */ + if (vrrp->version != RFC5798) { + + /* auth type must be the same locally configured */ + if (vrrpkt->auth_type != vrrp->auth_type) { + log_info + ("vrid %d :: Invalid pkt - Invalid authentication type", + vrrp->vrid); + return INVALID; + } + + /* auth type is simple */ + if (vrrpkt->auth_type == SIMPLE) { + uint32_t *auth_data = + (uint32_t *) ((unsigned char *) vrrpkt + + VRRP_PKTHDR_SIZE + + vrrp->naddr * sizeof(uint32_t)); + if (memcmp + (auth_data, vrrp->auth_data, + strlen(vrrp->auth_data)) + != 0) { + log_info + ("vrid %d :: Invalid pkt - Invalid authentication password", + vrrp->vrid); + return INVALID; + } + } + } + + /* count of IP address(es) and list may be the same + * or generated by the owner + */ + if (((vrrpkt->naddr != vrrp->naddr) + || (vnet->vip_compare(vnet, vrrpkt) != 0)) + && (vrrpkt->priority != PRIO_OWNER) && (vrrp->version == 2)) { + log_info + ("vrid %d :: Invalid pkt not generated by the owner, drop it", + vrrp->vrid); + return INVALID; + } + + /* advert interval must be the same as the locally configured */ + if (vrrpkt->adv_int != vrrp->adv_int) { + log_info + ("vrid %d :: Invalid pkt - Advertisement interval mismatch\n", + vrrp->vrid); + return INVALID; + } + + /* pkt is valid, keep it in internal buffer */ + memcpy(&vnet->__pkt.adv, vrrpkt, sizeof(struct vrrphdr)); + + return len; +} + +/** + * vrrp_net_send - send pkt + */ +int vrrp_net_send(const struct vrrp_net *vnet, struct iovec *iov, size_t len) +{ + if (iov == NULL) { + log_error("vrid %d :: No data to send !?", vnet->vrid); + return -1; + } + + struct sockaddr_ll device = { 0 }; + + device.sll_family = AF_PACKET; + device.sll_ifindex = if_nametoindex(vnet->vif.ifname); + + if (device.sll_ifindex == 0) { + log_error("vrid %d :: if_nametoindex - %s", vnet->vrid, + strerror(errno)); + return -1; + } + + struct msghdr msg = { 0 }; + + msg.msg_name = &device; + msg.msg_namelen = sizeof(device); + msg.msg_iov = iov; + msg.msg_iovlen = len; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_flags = 0; + + if (sendmsg(vnet->xmit, &msg, 0) < 0) { + log_error("vrid %d :: sendmsg - %s", vnet->vrid, + strerror(errno)); + return -1; + } + + return 0; +} diff --git a/vrrp_net.h b/vrrp_net.h new file mode 100644 index 0000000..db266d8 --- /dev/null +++ b/vrrp_net.h @@ -0,0 +1,148 @@ +/* + * vrrp_net.h + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + + +#ifndef _VRRP_NET_ +#define _VRRP_NET_ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "vrrp_ipx.h" +#include "vrrp_rfc.h" +#include "list.h" + +/* from vrrp.h */ +struct vrrp; + +/** + * constants + */ +#define IPPROTO_VRRP 112 +#define VIP_MAX 255 + +#define VRRP_AUTH_SIZE 2*sizeof(uint32_t) +#define VRRP_VIPMAX_SIZE VIP_MAX * sizeof(uint32_t) +#define VRRP_PKTHDR_SIZE sizeof(struct vrrphdr) +#define VRRP_PKT_MINSIZE VRRP_PKTHDR_SIZE + sizeof(uint32_t) +#define VRRP_PKT_MAXSIZE VRRP_PKTHDR_SIZE + VRRP_VIPMAX_SIZE + VRRP_AUTH_SIZE + +#define IPHDR_SIZE sizeof(struct iphdr) + +/** + * struct vrrp_ip - VRRP IPs addresses + */ +struct vrrp_ip { + union vrrp_ipx_addr ipx; + uint8_t netmask; + struct list_head iplist; + /* internal buffer for topology update pkt */ + struct iovec __topology[3]; +}; + +/** + * struct vrrp_if - VRRP interface + */ +struct vrrp_if { + char *ifname; + int mtu; + union vrrp_ipx_addr ipx; +}; + + +/** + * struct vrrp_recv - VRRP buffer recv + */ +struct vrrp_recv { + union vrrp_ipx_addr s_ipx; + union vrrp_ipx_addr d_ipx; + struct vrrp_ipx_header header; + struct vrrphdr adv; +}; + +/** + * struct vrrp_net - VRRP net structure + */ +struct vrrp_net { + /* VRRP id */ + uint8_t vrid; + + /* VRRP interface */ + struct vrrp_if vif; + + /* list of VRRP IP adresses */ + struct list_head vip_list; + + /* family */ + int family; + + /* count IP addresses */ + uint8_t naddr; + + /* listen VRRP socket */ + int socket; + + /* xmit VRRP socket */ + int xmit; + + /* buffer for received pkt */ + struct vrrp_recv __pkt; + + /* buffer for advertisement pkt */ + struct iovec __adv[3]; + + /* family helper functions */ + struct vrrp_ipx *ipx_helper; +}; + + +/** + * enum vrrp_ret - Return code used in vrrp_net_listen + */ +enum vrrp_ret { + INVALID = -1, + PKT, /* valid packet received */ + SIGNAL, /* signal catch */ + TIMER /* timer expired */ +}; + +/* + * funcs + */ +void vrrp_net_init(struct vrrp_net *vnet); +void vrrp_net_cleanup(struct vrrp_net *vnet); +int vrrp_net_socket(struct vrrp_net *vnet); +int vrrp_net_socket_xmit(struct vrrp_net *vnet); +int vrrp_net_vif_getaddr(struct vrrp_net *vnet); +int vrrp_net_vif_mtu(struct vrrp_net *vnet); +int vrrp_net_vip_set(struct vrrp_net *vnet, const char *ip); +int vrrp_net_listen(struct vrrp_net *vnet, struct vrrp *vrrp); +int vrrp_net_recv(struct vrrp_net *vnet, const struct vrrp *vrrp); +int vrrp_net_send(const struct vrrp_net *vnet, struct iovec *iov, size_t len); + +#endif /* _VRRP_NET_ */ diff --git a/vrrp_options.c b/vrrp_options.c new file mode 100644 index 0000000..ba49451 --- /dev/null +++ b/vrrp_options.c @@ -0,0 +1,250 @@ +/* + * vrrp_options.c + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#include +#include +#include +#include + +#include "vrrp.h" +#include "vrrp_net.h" +#include "vrrp_options.h" +#include "common.h" +#include "log.h" + +/* from uvrrpd.c */ +extern int background; +extern char *loglevel; + +/** + * vrrp_usage() + */ +static void vrrp_usage(void) +{ + fprintf(stdout, + "Usage: uvrrpd -v vrid -i ifname [OPTIONS] VIP1 [… VIPn]\n\n" + "Mandatory options:\n" + " -v, --vrid vrid Virtual router identifier\n" + " -i, --interface iface Interface\n" + " VIP Virtual IP(s), 1 to 255 VIPs\n\n" + "Optional arguments:\n" + " -p, --priority prio Priority of VRRP Instance, (0-255, default 100)\n" + " -t, --time delay Time interval between advertisements\n" + " Seconds in VRRPv2 (default 1s),\n" + " Centiseconds in VRRPv3 (default 100cs)\n" + " -P, --preempt on|off Switch preempt (default on)\n" + " -r, --rfc version Specify protocol 'version'\n" + " 2 (VRRPv2, RFC3768) by default,\n" + " 3 (VRRPv3, RFC5798)\n" + " -6, --ipv6 IPv6 support, (only in VRRPv3)\n" + " -a, --auth pass Simple text password (only in VRRPv2)\n" + " -f, --foreground Execute uvrrpd in foreground\n" + " -s, --script Path of hook script (default /etc/uvrrpd/uvrrpd-switch.sh)\n" +#if 0 /* todo */ + " --pidfile name Create pid file 'name'\n" +#endif + " -d, --debug\n" " -h, --help\n"); +} + +/** + * vrrp_options() - Parse command line options + */ +int vrrp_options(struct vrrp *vrrp, struct vrrp_net *vnet, int argc, + char *argv[]) +{ + int optc; + unsigned long opt; /* strtoul */ + + static struct option const opts[] = { + {"vrid", required_argument, 0, 'v'}, + {"interface", required_argument, 0, 'i'}, + {"priority", required_argument, 0, 'p'}, + {"time", required_argument, 0, 't'}, + {"preempt", required_argument, 0, 'P'}, + {"rfc", required_argument, 0, 'r'}, + {"ipv6", no_argument, 0, '6'}, + {"auth", required_argument, 0, 'a'}, + {"foreground", no_argument, 0, 'f'}, + {"script", required_argument, 0, 's'}, + {"debug", no_argument, 0, 'd'}, + {"help", no_argument, 0, 'h'}, + {NULL, 0, 0, 0} + }; + + while ((optc = + getopt_long(argc, argv, "v:i:p:t:P:r:6a:fs:dh", opts, + NULL)) != EOF) { + switch (optc) { + + /* vrid */ + case 'v': + if ((mystrtoul(&opt, optarg, VRID_MAX) == -ERANGE) + || (opt == 0)) { + fprintf(stderr, "1 < vrid < 255\n"); + vrrp_usage(); + return -1; + } + vrrp->vrid = vnet->vrid = (uint8_t) opt; + break; + + /* interface */ + case 'i': + vnet->vif.ifname = strndup(optarg, IFNAMSIZ); + if (vnet->vif.ifname == NULL) { + perror("strndup"); + return -1; + } + break; + + /* priority */ + case 'p': + if (mystrtoul(&opt, optarg, VRRP_PRIO_MAX) == -ERANGE) { + fprintf(stderr, "0 < priority < 255\n"); + vrrp_usage(); + return -1; + } + vrrp->priority = (uint8_t) opt; + break; + + /* delay */ + case 't': + if (mystrtoul(&opt, optarg, ADVINT_MAX) == -ERANGE) { + vrrp_usage(); + return -1; + } + vrrp->adv_int = (uint16_t) opt; + break; + + /* preempt mode */ + case 'P': + if (matches(optarg, "on")) + vrrp->preempt = TRUE; + else if (matches(optarg, "off")) + vrrp->preempt = FALSE; + else { + fprintf(stderr, + "preempt mode 'on' or 'off', by default 'on'\n"); + vrrp_usage(); + return -1; + } + break; + + /* RFC - version */ + case 'r': + if ((mystrtoul(&opt, optarg, RFC5798) == -ERANGE) + || (opt < RFC3768)) { + fprintf(stderr, "Version 2 or 3 : %ld\n", opt); + vrrp_usage(); + return -1; + } + vrrp->version = (uint8_t) opt; + break; + + /* IPv6 */ + case '6': /* Force RFC5798/VRRPv3 */ + vrrp->version = RFC5798; + vnet->family = AF_INET6; + break; + + /* auth */ + case 'a': /* only SIMPLE password supported */ + if (strlen(optarg) > VRRP_AUTH_PASS_LEN) { + fprintf(stderr, + "Password too long (8 char max)\n"); + vrrp_usage(); + return -1; + } + vrrp->auth_data = strndup(optarg, VRRP_AUTH_PASS_LEN); + vrrp->auth_type = SIMPLE; + /* hide passwd from ps */ + strncpy(optarg, "********", strlen(optarg)); + break; + + /* foreground */ + case 'f': + background = 0; + break; + + + /* script */ + case 's': + vrrp->scriptname = strndup(optarg, VRRP_SCRIPT_MAX); + if (vrrp->scriptname == NULL) { + perror("strndup"); + return -1; + } + break; + + /* debug */ + case 'd': + loglevel = strndup("debug", 6); + break; + + /* help */ + case 'h': + default: + vrrp_usage(); + return -1; + break; + } + } + + /* Fetch virtual IP addresses */ + if (optind == argc) { + fprintf(stderr, "Specify at least one virtual IP addr !\n"); + vrrp_usage(); + return -1; + } + + /* Number of IP addresses */ + vrrp->naddr = vnet->naddr = argc - optind; + + /* Register vrrp_vip addresses */ + while (optind != argc) { + if (vrrp_net_vip_set(vnet, argv[optind]) != 0) { + fprintf(stderr, "Invalid IP\n"); + vrrp_usage(); + return -1; + } + ++optind; + } + + /* minimal configuration */ + if (vrrp->vrid == 0) { + fprintf(stderr, "Specify VRRP id\n"); + vrrp_usage(); + return -1; + } + if (vnet->vif.ifname == NULL) { + fprintf(stderr, "Specify VRRP interface\n"); + vrrp_usage(); + return -1; + } + + /* default adv int */ + if ((vrrp->version == RFC3768) && (vrrp->adv_int == 0)) + vrrp->adv_int = 1; + if ((vrrp->version == RFC5798) && (vrrp->adv_int == 0)) + vrrp->adv_int = 100; + + /* Get IP addresse from interface name */ + return vrrp_net_vif_getaddr(vnet); +} diff --git a/vrrp_options.h b/vrrp_options.h new file mode 100644 index 0000000..765be1e --- /dev/null +++ b/vrrp_options.h @@ -0,0 +1,28 @@ +/* + * vrrp_options.h + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _VRRP_OPTIONS_H_ +#define _VRRP_OPTIONS_H_ + +int vrrp_options(struct vrrp *vrrp, struct vrrp_net *vnet, int argc, + char *argv[]); + +#endif /* _VRRP_OPTIONS_H_ */ diff --git a/vrrp_rfc.h b/vrrp_rfc.h new file mode 100644 index 0000000..e09e24b --- /dev/null +++ b/vrrp_rfc.h @@ -0,0 +1,54 @@ +/* + * vrrp_rfc.h + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _VRRP_RFC_H_ +#define _VRRP_RFC_H_ + +#include + +/* + * vrrphdr + * Header structure for rfc3768 et rfc5798 + */ + +struct vrrphdr { + uint8_t version_type; /* 0-3=version, 4-7=type */ + uint8_t vrid; + uint8_t priority; + uint8_t naddr; + union { + + /* rfc 3768 */ + struct { + uint8_t auth_type; + uint8_t adv_int; + }; + + /* rfc 5798 */ + uint16_t max_adv_int; /* 0-3=rsvd, 4-5=adv_int */ + }; + uint16_t chksum; + + /* virtual IPs start here */ + +} __attribute__ ((packed)); + +#endif /* _VRRP_RFC_H_ */ diff --git a/vrrp_state.c b/vrrp_state.c new file mode 100644 index 0000000..0eab552 --- /dev/null +++ b/vrrp_state.c @@ -0,0 +1,320 @@ +/* + * vrrp_state.c + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#include + +#include "vrrp.h" +#include "vrrp_net.h" +#include "vrrp_adv.h" +#include "vrrp_arp.h" +#include "vrrp_na.h" +#include "vrrp_exec.h" + +#include "log.h" +#include "bits.h" +#include "uvrrpd.h" + +extern unsigned long reg; + +/** + * switching state functions + */ +static int vrrp_state_goto_master(struct vrrp *vrrp, struct vrrp_net *vnet); +static int vrrp_state_goto_backup(struct vrrp *vrrp, struct vrrp_net *vnet); + +/** + * vrrp_state_init() - Initial state of VRRP instance + * + * Switch to master or backup state + */ +int vrrp_state_init(struct vrrp *vrrp, struct vrrp_net *vnet) +{ + log_notice("vrid %d :: %s", vrrp->vrid, "init"); + + /* init Master_Adver_Interval */ + vrrp->master_adv_int = vrrp->adv_int; + log_debug("%d", vrrp->master_adv_int); + + /* router owns ip address(es) */ + if (vrrp->priority == 255) { + log_debug("%s %d :%s", "priority", vrrp->priority, + "router owns VIP address(es)"); + return vrrp_state_goto_master(vrrp, vnet); + } + + return vrrp_state_goto_backup(vrrp, vnet); +} + +/** + * vrrp_state_backup() - handle backup state + */ +int vrrp_state_backup(struct vrrp *vrrp, struct vrrp_net *vnet) +{ + int event = vrrp_net_listen(vnet, vrrp); + + switch (event) { + case TIMER: + log_notice("vrid %d :: %s", vrrp->vrid, + "masterdown_timer expired"); + + vrrp_state_goto_master(vrrp, vnet); + break; + + case PKT: /* valid PKT adv */ + /* Must be impossible */ + if (vrrp_adv_get_version(vnet) == 0) { + log_error("vrid %d :: %s", vrrp->vrid, + "recv buffer empty !?"); + break; + } + + log_debug("vrid %d :: %s", vrrp->vrid, + "pkt received from current master"); + log_debug("vrid %d :: %s:%d %s:%d %s:%s", vrrp->vrid, "prio", + vrrp->priority, "prio recv", + vrrp_adv_get_priority(vnet), "preempt", + STR_PREEMPT(vrrp->preempt)); + + /* Priority of received pkt is 0 + * => set Master_Down_Timer to skew_time + */ + if (vrrp_adv_get_priority(vnet) == 0) { + log_info("vrid %d :: %s", vrrp->vrid, + "receive packet with priority 0"); + log_notice("vrid %d :: %s %d", vrrp->vrid, + "set masterdown_timer to skew_time", + SKEW_TIME(vrrp)); + + VRRP_SET_SKEW_TIME(vrrp); + break; + } + + /* Master has send its adv pkt, or preemption mode is false + */ + if ((vrrp->preempt == FALSE) || + (vrrp_adv_get_priority(vnet) >= vrrp->priority)) { + + /* RFC5798: Set Master_Adver_Interval to + * Advertisement_Interval + */ + if (vrrp->version == RFC5798) + vrrp->master_adv_int = + vrrp_adv_get_advint(vnet); + +#ifdef DEBUG + print_buf_hexa("hexa master_adv_int", + &vrrp->master_adv_int, sizeof(uint16_t)); +#endif + + + + VRRP_SET_MASTERDOWN_TIMER(vrrp); + break; + } + + /* Our priority is greater and preemption mode is true + * So we discard advertisement. + * Maybe we'll become Master if Master_Down_Timer expire, + */ + log_info("vrid %d :: %s", vrrp->vrid, "discard advertisement"); + + break; + + case SIGNAL: + log_debug("vrid %d :: signal", vrrp->vrid); + + /* shutdown/reload event ? */ + if (test_and_clear_bit(UVRRPD_RELOAD, ®)) { + vrrp_timer_clear(&vrrp->masterdown_timer); + vrrp->state = INIT; + } + + break; + + case INVALID: + log_warning("vrid %d :: %s %s, %s", vrrp->vrid, + "receive an invalid advertisement packet from", + vrrp_adv_get_ntoa_addr(vnet), "ignore it"); + + break; + + default: + log_error("vrid %d :: %s r:%d", vrrp->vrid, "unknown event", + event); + break; + } + + return event; +} + + +/** + * vrrp_state_master() - handle master state + */ +int vrrp_state_master(struct vrrp *vrrp, struct vrrp_net *vnet) +{ + int event = vrrp_net_listen(vnet, vrrp); + + switch (event) { + case TIMER: + /* adv_timer expired, time to send another */ + log_info("vrid %d :: %s", vrrp->vrid, "adv_timer expired"); + vrrp_adv_send(vnet); + VRRP_SET_ADV_TIMER(vrrp); + break; + + case PKT: + if (vrrp_adv_get_version(vnet) == 0) { + log_error("vrid %d :: %s", vrrp->vrid, + "recv buffer empty !?"); + break; + } + + log_debug("vrid %d :: %s:%d %s:%d %s:%s", vrrp->vrid, "prio", + vrrp->priority, "prio recv", + vrrp_adv_get_priority(vnet), "preempt", + STR_PREEMPT(vrrp->preempt)); + + /* Priority of received pkt is 0 + * We send an advertisement + * and rearm Adv_timer + */ + if (vrrp_adv_get_priority(vnet) == 0) { + log_info("vrid %d :: %s", vrrp->vrid, + "receive packet with priority 0"); + vrrp_adv_send(vnet); + VRRP_SET_ADV_TIMER(vrrp); + break; + } + + /* Priority of received pkt is greater than our, + * or Priority of received pkt is equal, but + * primary IP address of the sender is greater than + * the local primary IP address + * => switch to backup + * TODO : /!\ don't work in IPv6 /!\ + */ + if ((vrrp_adv_get_priority(vnet) > vrrp->priority) || + ((vrrp_adv_get_priority(vnet) == vrrp->priority) && + (vrrp_adv_get_ntohl_addr(vnet) > + ntohl(vnet->vif.ip_addr.s_addr)))) { + + log_notice("vrid %d :: %s", vrrp->vrid, + "receive packet with higher priority"); + + vrrp_state_goto_backup(vrrp, vnet); + break; + } + + /* We have the greatest priority */ + log_info("vrid %d :: %s", vrrp->vrid, "discard advertisement"); + + break; + + case SIGNAL: + log_debug("vrid %d :: signal", vrrp->vrid); + + /* shutdown/reload event ? */ + if (test_and_clear_bit(UVRRPD_RELOAD, ®)) { + vrrp_timer_clear(&vrrp->adv_timer); + vrrp_adv_send_zero(vnet); + /* berk */ + vrrp_exec(vrrp, vnet, BACKUP); + vrrp->state = INIT; + } + + break; + + case INVALID: + log_warning("vrid %d :: invalid event", vrrp->vrid); + break; + + default: + log_error("vrid %d :: %s r:%d", vrrp->vrid, "unknown event", + event); + break; + } + + return event; +} + + +/** + * vrrp_state_goto_master() - switch state to master + */ +static int vrrp_state_goto_master(struct vrrp *vrrp, struct vrrp_net *vnet) +{ + log_notice("vrid %d :: %s -> %s", vrrp->vrid, + STR_STATE(vrrp->state), "master"); + + vrrp->state = MASTER; + + /* IPv4 specific */ + vrrp_adv_send(vnet); + + if (vnet->family == AF_INET) + vrrp_arp_send(vnet); + else if (vnet->family == AF_INET6) + vrrp_na_send(vnet); + + /* script */ + vrrp_exec(vrrp, vnet, vrrp->state); + + /* reset masterdown_timer && set ADV timer */ + vrrp_timer_clear(&vrrp->masterdown_timer); + VRRP_SET_ADV_TIMER(vrrp); + + return 0; +} + + +/** + * vrrp_state_goto_backup() - switch state to backup + */ +static int vrrp_state_goto_backup(struct vrrp *vrrp, struct vrrp_net *vnet) +{ + log_notice("vrid %d :: %s -> %s", vrrp->vrid, + STR_STATE(vrrp->state), "backup"); + + int previous_state = vrrp->state; + vrrp->state = BACKUP; + + log_debug("%s:%s", STR_STATE(previous_state), STR_STATE(vrrp->state)); + + /* script */ + if (previous_state != INIT) + vrrp_exec(vrrp, vnet, vrrp->state); + + if (vrrp->version == RFC5798) { + if (previous_state == INIT) + vrrp->master_adv_int = vrrp->adv_int; + if (previous_state == MASTER) + vrrp->master_adv_int = vrrp_adv_get_advint(vnet); + } + + /* clear adv timer && set masterdown_timer */ + vrrp_timer_clear(&vrrp->adv_timer); + VRRP_SET_MASTERDOWN_TIMER(vrrp); + + log_debug("%d %d", vrrp->master_adv_int, + 3 * vrrp->master_adv_int + SKEW_TIME(vrrp)); + return 0; +} diff --git a/vrrp_state.h b/vrrp_state.h new file mode 100644 index 0000000..96055e0 --- /dev/null +++ b/vrrp_state.h @@ -0,0 +1,42 @@ +/* + * vrrp_state.h - VRRP state machine + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + +#ifndef _VRRP_STATE_H_ +#define _VRRP_STATE_H_ + +/** + * vrrp_state - VRRP states + */ +typedef enum { + INIT, + BACKUP, + MASTER +} vrrp_state; + + +#define STR_STATE(s) (s == INIT ? "init" : \ + ((s == BACKUP) ? "backup" : "master")) + +int vrrp_state_init(struct vrrp *vrrp, struct vrrp_net *vnet); +int vrrp_state_master(struct vrrp *vrrp, struct vrrp_net *vnet); +int vrrp_state_backup(struct vrrp *vrrp, struct vrrp_net *vnet); + +#endif /* _VRRP_STATE_H_ */ diff --git a/vrrp_switch.sh b/vrrp_switch.sh new file mode 100755 index 0000000..61a500c --- /dev/null +++ b/vrrp_switch.sh @@ -0,0 +1,62 @@ +#!/bin/sh + +state=$1 +vrid=$2 +ifname=$3 +priority=$4 +adv_int=$5 +naddr=$6 +family=$7 +ips=$8 + +echo "state\t\t$state +vrid\t\t$vrid +ifname\t\t$ifname +priority\t$priority +adv_int\t\t$adv_int +naddr\t\t$naddr +ips\t\t$ips" > /tmp/state.vrrp_${vrid}_${ifname} + +interface=vrrp_${ifname}_${vrid} + +echo $ips + +case "$state" in + + "init" ) + # adjust sysctl + sysctl -w net.ipv4.conf.all.rp_filter=0 + sysctl -w net.ipv4.conf.all.arp_ignore=1 + sysctl -w net.ipv4.conf.all.arp_announce=2 + + ;; + + "master" ) + # create macvlan interface + HEXA_VRID=$(printf %x $vrid) + ip link add link $ifname address 00:00:5E:00:01:$HEXA_VRID $interface type macvlan + + # set virtual ips addresses + OIFS=$IFS + IFS=',' + + for ip in $ips; do + ip -$family addr add $ip dev $interface + sysctl -w net.ipv6.conf.$interface.autoconf=0 + sysctl -w net.ipv6.conf.$interface.accept_ra=0 + sysctl -w net.ipv6.conf.$interface.forwarding=1 + done + ip link set dev $interface up + + IFS=$OIFS + + ;; + + "backup" ) + # destroy macvlan interface + ip link del $interface + + ;; +esac + +exit 0 diff --git a/vrrp_timer.c b/vrrp_timer.c new file mode 100644 index 0000000..97c0d90 --- /dev/null +++ b/vrrp_timer.c @@ -0,0 +1,168 @@ +/* + * vrrp_timer.c - functions manipulating VRRP timers + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + * + * + * These functions use clock_gettime() and CLOCK_MONOTONIC_RAW + * which access to a raw hardware-based time that is not subject to + * NTP adjustements. + */ + +#include +#include +#include +#include + +#include "vrrp_timer.h" +#include "log.h" + +/* 1s for timespec operations */ +#define NANOUL 1000000000 +#define CENTUL 10000000 + +/** + * timespec_substract() - substract two timestamp + * + * Subtract the `struct timespec' values X and Y, + * The difference is stored in timespect result. + * @return 1 if the difference is negative, otherwise 0. + */ +static inline int timespec_substract(struct timespec *result, + struct timespec *x, struct timespec *y) +{ + /* Perform the carry for the later subtraction by updating y. */ + if (x->tv_nsec < y->tv_nsec) { + time_t nsec = (y->tv_nsec - x->tv_nsec) / NANOUL + 1; + y->tv_nsec -= NANOUL * nsec; + y->tv_sec += nsec; + } + if (x->tv_nsec - y->tv_nsec > NANOUL) { + time_t nsec = (x->tv_nsec - y->tv_nsec) / NANOUL; + y->tv_nsec += NANOUL * nsec; + y->tv_sec -= nsec; + } + + /* Compute the time remaining to wait. + tv_nsec is certainly positive. */ + result->tv_sec = x->tv_sec - y->tv_sec; + result->tv_nsec = x->tv_nsec - y->tv_nsec; + + /* Return 1 if result is negative. */ + return x->tv_sec < y->tv_sec; +} + +/** + * vrrp_timer_set() - set timer and reset delta + * + * @delay + * @return -1 if clock_gettime() fail, 0 else + */ +int vrrp_timer_set(struct vrrp_timer *timer, time_t delay, long delay_cs) +{ + if (clock_gettime(CLOCK_MONOTONIC_RAW, &timer->ts) == -1) { + log_error("clock_gettime: %s", strerror(errno)); + return -1; + } + + timer->ts.tv_sec += delay; + timer->ts.tv_nsec += delay_cs * CENTUL; + + log_debug("delay %ld", delay); + log_debug("delay_cs %ld", delay_cs); + + log_debug("timer->ts.tv_sec %ld", timer->ts.tv_sec); + log_debug("timer->ts.tv_nsec %ld", timer->ts.tv_nsec); + + /* reset delta */ + timer->delta.tv_sec = 0; + timer->delta.tv_nsec = 0; + + return 0; +} + +/** + * vrrp_timer_clear() - clear (reset) timer + */ +void vrrp_timer_clear(struct vrrp_timer *timer) +{ + if (timer == NULL) + return; + + timer->ts.tv_sec = 0; + timer->ts.tv_nsec = 0; + timer->delta.tv_sec = 0; + timer->delta.tv_nsec = 0; +} + +/** + * vrrp_timer_is_running() - determine if a timer is + * currently used + * + * @return 1 if running, 0 else + */ +int vrrp_timer_is_running(struct vrrp_timer *timer) +{ + if ((timer->ts.tv_sec != 0) || (timer->ts.tv_nsec != 0)) + return 1; + + return 0; +} + +/** + * vrrp_timer_update() - update a timer + * + * @return -1 if clock_gettime() failed + * @return ETIME if timer is expired + * @return 0 if timer is successfully updated + */ +int vrrp_timer_update(struct vrrp_timer *timer) +{ + struct timespec ts; + + if (clock_gettime(CLOCK_MONOTONIC_RAW, &ts) == -1) { + log_error("clock_gettime: %s", strerror(errno)); + return -1; /* TODO die() */ + } + + if (timespec_substract(&timer->delta, &timer->ts, &ts)) { + log_debug("current timer expired"); + return 1; + } + + timer->ts.tv_sec = ts.tv_sec + timer->delta.tv_sec; + timer->ts.tv_nsec = ts.tv_nsec + timer->delta.tv_nsec; + + log_debug("timer->ts.tv_sec %ld", timer->ts.tv_sec); + log_debug("timer->ts.tv_nsec %ld", timer->ts.tv_nsec); + + return 0; +} + +/** + * vrrp_timer_is_expired() - check if a timer is expired + * + */ +int vrrp_timer_is_expired(struct vrrp_timer *timer) +{ + if (vrrp_timer_update(timer) + || ((timer->ts.tv_sec <= 0) && (timer->ts.tv_nsec <= 0))) + return 1; + + return 0; +} diff --git a/vrrp_timer.h b/vrrp_timer.h new file mode 100644 index 0000000..cf4b290 --- /dev/null +++ b/vrrp_timer.h @@ -0,0 +1,75 @@ +/* + * vrrp_timer.h - functions manipulating VRRP timers + * + * These functions use clock_gettime() and CLOCK_MONOTONIC_RAW + * which use a raw hardware-based time that is not subject to + * NTP adjustements. + * + * Copyright (C) 2014 Arnaud Andre + * + * This file is part of uvrrpd. + * + * uvrrpd is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * uvrrpd is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with uvrrpd. If not, see . + */ + + +#ifndef _VRRP_TIMER_H_ +#define _VRRP_TIMER_H_ + +#include + +/** + * struct vrrp_timer + * + * @ts timestamp in ns + * @delta time since the last update + */ +struct vrrp_timer { + struct timespec ts; + struct timespec delta; +}; + +/* prototype functions */ +int vrrp_timer_set(struct vrrp_timer *timer, time_t delay, long delay_cs); +void vrrp_timer_clear(struct vrrp_timer *timer); +int vrrp_timer_is_running(struct vrrp_timer *timer); +int vrrp_timer_update(struct vrrp_timer *timer); +int vrrp_timer_is_expired(struct vrrp_timer *timer); + +/* Specific VRRP timer macros */ + +#define SKEW_TIME( v ) \ + ( (256 - v->priority) * \ + (v->version==3?v->master_adv_int:1) / 256 ) + +#define MASTERDOWN_INT( v ) \ + (3 * v->master_adv_int + SKEW_TIME( v )) + +#define VRRP_SET_ADV_TIMER( v ) \ + vrrp_timer_set(&v->adv_timer, \ + (v->version == 3 ? 0:v->adv_int), \ + (v->version == 3 ? v->master_adv_int:0)) + +#define VRRP_SET_MASTERDOWN_TIMER( v ) \ + vrrp_timer_set(&v->masterdown_timer, \ + (v->version == 3 ? 0:MASTERDOWN_INT( v )), \ + (v->version == 3 ? MASTERDOWN_INT( v ):0)) + +#define VRRP_SET_SKEW_TIME( v ) \ + vrrp_timer_set(&v->masterdown_timer, \ + (v->version == 3 ? 0:SKEW_TIME( v )), \ + (v->version == 3 ? SKEW_TIME( v ):0)) + + +#endif /* _VRRP_TIMER_H_ */