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vrrp.c
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/*
* VRRP global definitions and state machine.
* Copyright (C) 2018-2019 Cumulus Networks, Inc.
* Quentin Young
*
* 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 2 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; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "lib/hash.h"
#include "lib/hook.h"
#include "lib/if.h"
#include "lib/linklist.h"
#include "lib/memory.h"
#include "lib/network.h"
#include "lib/prefix.h"
#include "lib/sockopt.h"
#include "lib/sockunion.h"
#include "lib/vrf.h"
#include "lib/vty.h"
#include "vrrp.h"
#include "vrrp_arp.h"
#include "vrrp_debug.h"
#include "vrrp_ndisc.h"
#include "vrrp_packet.h"
#include "vrrp_zebra.h"
#define VRRP_LOGPFX "[CORE] "
DEFINE_MTYPE_STATIC(VRRPD, VRRP_IP, "VRRP IP address")
DEFINE_MTYPE_STATIC(VRRPD, VRRP_RTR, "VRRP Router")
/* statics */
struct hash *vrrp_vrouters_hash;
bool vrrp_autoconfig_is_on;
int vrrp_autoconfig_version;
struct vrrp_defaults vd;
const char *const vrrp_state_names[3] = {
[VRRP_STATE_INITIALIZE] = "Initialize",
[VRRP_STATE_MASTER] = "Master",
[VRRP_STATE_BACKUP] = "Backup",
};
static const char *const vrrp_event_names[2] = {
[VRRP_EVENT_STARTUP] = "Startup",
[VRRP_EVENT_SHUTDOWN] = "Shutdown",
};
/* Utility functions ------------------------------------------------------- */
/*
* Sets an ethaddr to RFC-defined Virtual Router MAC address.
*
* mac
* ethaddr to set
*
* v6
* Whether this is a V6 or V4 Virtual Router MAC
*
* vrid
* Virtual Router Identifier
*/
static void vrrp_mac_set(struct ethaddr *mac, bool v6, uint8_t vrid)
{
/*
* V4: 00-00-5E-00-01-{VRID}
* V6: 00-00-5E-00-02-{VRID}
*/
mac->octet[0] = 0x00;
mac->octet[1] = 0x00;
mac->octet[2] = 0x5E;
mac->octet[3] = 0x00;
mac->octet[4] = v6 ? 0x02 : 0x01;
mac->octet[5] = vrid;
}
/*
* Recalculates and sets skew_time and master_down_interval based
* values.
*
* r
* VRRP Router to operate on
*/
static void vrrp_recalculate_timers(struct vrrp_router *r)
{
uint16_t mdiadv = r->vr->version == 3 ? r->master_adver_interval
: r->vr->advertisement_interval;
uint16_t skm = (r->vr->version == 3) ? r->master_adver_interval : 100;
r->skew_time = ((256 - r->vr->priority) * skm) / 256;
r->master_down_interval = 3 * mdiadv;
r->master_down_interval += r->skew_time;
}
/*
* Determines if a VRRP router is the owner of the specified address.
*
* The determining factor for whether an interface is the address owner is
* simply whether the address is assigned to the VRRP base interface by someone
* other than vrrpd.
*
* This function should always return the correct answer regardless of
* master/backup status.
*
* ifp
* The interface to check owernship of. This should be the base interface of
* a VRRP router.
*
* vr
* Virtual Router
*
* Returns:
* whether or not vr owns the specified address
*/
static bool vrrp_is_owner(struct interface *ifp, struct ipaddr *addr)
{
/*
* This code sanity checks implicit ownership configuration. Ideally,
* the way we determine address ownership status for this VRRP router
* is by looking at whether our VIPs are also assigned to the base
* interface, and therefore count as "real" addresses. This frees the
* user from having to manually configure priority 255 to indicate
* address ownership. However, this means one of the VIPs will be used
* as the source address for VRRP advertisements, which in turn means
* that other VRRP routers will be receiving packets with a source
* address they themselves have. This causes lots of different issues
* so for now we're disabling this and forcing the user to configure
* priority 255 to indicate ownership.
*/
return false;
#if 0
struct prefix p;
p.family = IS_IPADDR_V4(addr) ? AF_INET : AF_INET6;
p.prefixlen = IS_IPADDR_V4(addr) ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN;
memcpy(&p.u, &addr->ip, sizeof(addr->ip));
return !!connected_lookup_prefix_exact(ifp, &p);
#endif
}
/*
* Whether an interface has a MAC address that matches the VRRP RFC.
*
* ifp
* Interface to check
*
* Returns:
* Whether the interface has a VRRP mac or not
*/
static bool vrrp_ifp_has_vrrp_mac(struct interface *ifp)
{
struct ethaddr vmac4;
struct ethaddr vmac6;
vrrp_mac_set(&vmac4, 0, 0x00);
vrrp_mac_set(&vmac6, 1, 0x00);
return !memcmp(ifp->hw_addr, vmac4.octet, sizeof(vmac4.octet) - 1)
|| !memcmp(ifp->hw_addr, vmac6.octet, sizeof(vmac6.octet) - 1);
}
/*
* Lookup a Virtual Router instance given a macvlan subinterface.
*
* The VRID is extracted from the interface MAC and the 2-tuple (iface, vrid)
* is used to look up any existing instances that match the interface. It does
* not matter whether the instance is already bound to the interface or not.
*
* Note that the interface linkages must be correct for this to work. In other
* words, the macvlan must have a valid VRRP MAC, and its link_ifindex must be
* be equal to the ifindex of another interface in the interface RB trees (its
* parent). If these conditions aren't satisfied we won't find the VR.
*
* mvl_ifp
* Interface pointer to use to lookup. Should be a macvlan device.
*
* Returns:
* Virtual Router, if found
* NULL otherwise
*/
static struct vrrp_vrouter *vrrp_lookup_by_if_mvl(struct interface *mvl_ifp)
{
struct interface *p;
if (!mvl_ifp || mvl_ifp->link_ifindex == 0
|| !vrrp_ifp_has_vrrp_mac(mvl_ifp)) {
if (mvl_ifp && mvl_ifp->link_ifindex == 0)
DEBUGD(&vrrp_dbg_zebra,
VRRP_LOGPFX
"Interface %s has no parent ifindex; disregarding",
mvl_ifp->name);
if (mvl_ifp && !vrrp_ifp_has_vrrp_mac(mvl_ifp))
DEBUGD(&vrrp_dbg_zebra,
VRRP_LOGPFX
"Interface %s has a non-VRRP MAC; disregarding",
mvl_ifp->name);
return NULL;
}
p = if_lookup_by_index(mvl_ifp->link_ifindex, mvl_ifp->vrf_id);
if (!p) {
DEBUGD(&vrrp_dbg_zebra,
VRRP_LOGPFX
"Tried to lookup interface %d, parent of %s, but it doesn't exist",
mvl_ifp->link_ifindex, mvl_ifp->name);
return NULL;
}
uint8_t vrid = mvl_ifp->hw_addr[5];
return vrrp_lookup(p, vrid);
}
/*
* Lookup the Virtual Router instances configured on a particular interface.
*
* ifp
* Interface pointer to use to lookup. Should not be a macvlan device.
*
* Returns:
* List of virtual routers found
*/
static struct list *vrrp_lookup_by_if(struct interface *ifp)
{
struct list *l = hash_to_list(vrrp_vrouters_hash);
struct listnode *ln, *nn;
struct vrrp_vrouter *vr;
for (ALL_LIST_ELEMENTS(l, ln, nn, vr))
if (vr->ifp != ifp)
list_delete_node(l, ln);
return l;
}
/*
* Lookup any Virtual Router instances associated with a particular interface.
* This is a combination of the results from vrrp_lookup_by_if_mvl and
* vrrp_lookup_by_if.
*
* Suppose the system interface list looks like the following:
*
* eth0
* \- eth0-v0 00:00:5e:00:01:01
* \- eth0-v1 00:00:5e:00:02:01
* \- eth0-v2 00:00:5e:00:01:0a
*
* Passing eth0-v2 to this function will give you the VRRP instance configured
* on eth0 with VRID 10. Passing eth0-v0 or eth0-v1 will give you the VRRP
* instance configured on eth0 with VRID 1. Passing eth0 will give you both.
*
* ifp
* Interface pointer to use to lookup. Can be any interface.
*
* Returns:
* List of virtual routers found
*/
static struct list *vrrp_lookup_by_if_any(struct interface *ifp)
{
struct vrrp_vrouter *vr;
struct list *vrs;
vr = vrrp_lookup_by_if_mvl(ifp);
vrs = vr ? list_new() : vrrp_lookup_by_if(ifp);
if (vr)
listnode_add(vrs, vr);
return vrs;
}
/* Configuration controllers ----------------------------------------------- */
void vrrp_check_start(struct vrrp_vrouter *vr)
{
struct vrrp_router *r;
bool start;
const char *whynot = NULL;
if (vr->shutdown || vr->ifp == NULL)
return;
r = vr->v4;
/* Must not already be started */
start = r->fsm.state == VRRP_STATE_INITIALIZE;
whynot = (!start && !whynot) ? "Already running" : whynot;
/* Must have a parent interface */
start = start && (vr->ifp != NULL);
whynot = (!start && !whynot) ? "No base interface" : whynot;
#if 0
/* Parent interface must be up */
start = start && if_is_operative(vr->ifp);
start = (!start && !whynot) ? "Base interface inoperative" : whynot;
#endif
/* Parent interface must have at least one v4 */
start = start && connected_count_by_family(vr->ifp, AF_INET) > 0;
whynot = (!start && !whynot) ? "No primary IPv4 address" : whynot;
/* Must have a macvlan interface */
start = start && (r->mvl_ifp != NULL);
whynot = (!start && !whynot) ? "No VRRP interface" : whynot;
#if 0
/* Macvlan interface must be admin up */
start = start && CHECK_FLAG(r->mvl_ifp->flags, IFF_UP);
start = (!start && !whynot) ? "Macvlan device admin down" : whynot;
#endif
/* Must have at least one VIP configured */
start = start && r->addrs->count > 0;
whynot = (!start && !whynot) ? "No Virtual IP address configured"
: whynot;
if (start)
vrrp_event(r, VRRP_EVENT_STARTUP);
else if (whynot)
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Refusing to start Virtual Router: %s",
vr->vrid, family2str(r->family), whynot);
whynot = NULL;
r = vr->v6;
/* Must not already be started */
start = r->fsm.state == VRRP_STATE_INITIALIZE;
whynot = (!start && !whynot) ? "Already running" : whynot;
/* Must not be v2 */
start = start && vr->version != 2;
whynot = (!start && !whynot) ? "VRRPv2 does not support v6" : whynot;
/* Must have a parent interface */
start = start && (vr->ifp != NULL);
whynot = (!start && !whynot) ? "No base interface" : whynot;
#if 0
/* Parent interface must be up */
start = start && if_is_operative(vr->ifp);
start = (!start && !whynot) ? "Base interface inoperative" : whynot;
#endif
/* Must have a macvlan interface */
start = start && (r->mvl_ifp != NULL);
whynot = (!start && !whynot) ? "No VRRP interface" : whynot;
#if 0
/* Macvlan interface must be admin up */
start = start && CHECK_FLAG(r->mvl_ifp->flags, IFF_UP);
start = (!start && !whynot) ? "Macvlan device admin down" : whynot;
/* Macvlan interface must have a link local */
start = start && connected_get_linklocal(r->mvl_ifp);
whynot =
(!start && !whynot) ? "No link local address configured" : whynot;
/* Macvlan interface must have a v6 IP besides the link local */
start = start && (connected_count_by_family(r->mvl_ifp, AF_INET6) > 1);
whynot = (!start && !whynot)
? "No Virtual IPv6 address configured on macvlan device"
: whynot;
#endif
/* Must have at least one VIP configured */
start = start && r->addrs->count > 0;
whynot =
(!start && !whynot) ? "No Virtual IP address configured" : whynot;
if (start)
vrrp_event(r, VRRP_EVENT_STARTUP);
else if (whynot)
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Refusing to start Virtual Router: %s",
vr->vrid, family2str(r->family), whynot);
}
void vrrp_set_priority(struct vrrp_vrouter *vr, uint8_t priority)
{
vr->priority = priority;
vr->v4->priority = priority;
vr->v6->priority = priority;
}
void vrrp_set_advertisement_interval(struct vrrp_vrouter *vr,
uint16_t advertisement_interval)
{
if (vr->advertisement_interval == advertisement_interval)
return;
vr->advertisement_interval = advertisement_interval;
vrrp_recalculate_timers(vr->v4);
vrrp_recalculate_timers(vr->v6);
}
static bool vrrp_has_ip(struct vrrp_vrouter *vr, struct ipaddr *ip)
{
struct vrrp_router *r = ip->ipa_type == IPADDR_V4 ? vr->v4 : vr->v6;
struct listnode *ln;
struct ipaddr *iter;
for (ALL_LIST_ELEMENTS_RO(r->addrs, ln, iter))
if (!memcmp(&iter->ip, &ip->ip, IPADDRSZ(ip)))
return true;
return false;
}
int vrrp_add_ip(struct vrrp_vrouter *vr, struct ipaddr *ip)
{
struct vrrp_router *r = IS_IPADDR_V4(ip) ? vr->v4 : vr->v6;
int af = r->family;
assert(r->family == af);
assert(!(r->vr->version == 2 && ip->ipa_type == IPADDR_V6));
if (vrrp_has_ip(r->vr, ip))
return 0;
if (!vrrp_is_owner(r->vr->ifp, ip) && r->is_owner) {
char ipbuf[INET6_ADDRSTRLEN];
inet_ntop(r->family, &ip->ip, ipbuf, sizeof(ipbuf));
zlog_err(
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"This VRRP router is not the address owner of %s, but is the address owner of other addresses; this config is unsupported.",
r->vr->vrid, family2str(r->family), ipbuf);
return -1;
}
struct ipaddr *new = XCALLOC(MTYPE_VRRP_IP, sizeof(struct ipaddr));
*new = *ip;
listnode_add(r->addrs, new);
if (r->fsm.state == VRRP_STATE_MASTER) {
switch (r->family) {
case AF_INET:
vrrp_garp_send(r, &new->ipaddr_v4);
break;
case AF_INET6:
vrrp_ndisc_una_send(r, new);
break;
}
}
return 0;
}
int vrrp_add_ipv4(struct vrrp_vrouter *vr, struct in_addr v4)
{
struct ipaddr ip;
ip.ipa_type = IPADDR_V4;
ip.ipaddr_v4 = v4;
return vrrp_add_ip(vr, &ip);
}
int vrrp_add_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6)
{
assert(vr->version != 2);
struct ipaddr ip;
ip.ipa_type = IPADDR_V6;
ip.ipaddr_v6 = v6;
return vrrp_add_ip(vr, &ip);
}
int vrrp_del_ip(struct vrrp_vrouter *vr, struct ipaddr *ip)
{
struct listnode *ln, *nn;
struct ipaddr *iter;
int ret = 0;
struct vrrp_router *r = IS_IPADDR_V4(ip) ? vr->v4 : vr->v6;
if (!vrrp_has_ip(r->vr, ip))
return 0;
for (ALL_LIST_ELEMENTS(r->addrs, ln, nn, iter))
if (!memcmp(&iter->ip, &ip->ip, IPADDRSZ(ip)))
list_delete_node(r->addrs, ln);
/*
* NB: Deleting the last address and then issuing a shutdown will cause
* transmission of a priority 0 VRRP Advertisement - as per the RFC -
* but it will have no addresses. This is not forbidden in the RFC but
* might confuse other implementations.
*/
if (r->addrs->count == 0 && r->fsm.state != VRRP_STATE_INITIALIZE)
ret = vrrp_event(r, VRRP_EVENT_SHUTDOWN);
return ret;
}
int vrrp_del_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6)
{
struct ipaddr ip;
ip.ipa_type = IPADDR_V6;
ip.ipaddr_v6 = v6;
return vrrp_del_ip(vr, &ip);
}
int vrrp_del_ipv4(struct vrrp_vrouter *vr, struct in_addr v4)
{
struct ipaddr ip;
ip.ipa_type = IPADDR_V4;
ip.ipaddr_v4 = v4;
return vrrp_del_ip(vr, &ip);
}
/* Creation and destruction ------------------------------------------------ */
static void vrrp_router_addr_list_del_cb(void *val)
{
struct ipaddr *ip = val;
XFREE(MTYPE_VRRP_IP, ip);
}
/*
* Search for a suitable macvlan subinterface we can attach to, and if found,
* attach to it.
*
* r
* Router to attach to interface
*
* Returns:
* Whether an interface was successfully attached
*/
static bool vrrp_attach_interface(struct vrrp_router *r)
{
/* Search for existing interface with computed MAC address */
struct interface **ifps;
size_t ifps_cnt =
if_lookup_by_hwaddr(r->vmac.octet, sizeof(r->vmac.octet), &ifps,
r->vr->ifp->vrf_id);
/*
* Filter to only those macvlan interfaces whose parent is the base
* interface this VRRP router is configured on.
*
* If there are still multiple interfaces we just select the first one,
* as it should be functionally identical to the others.
*/
unsigned int candidates = 0;
struct interface *selection = NULL;
for (unsigned int i = 0; i < ifps_cnt; i++) {
if (ifps[i]->link_ifindex != r->vr->ifp->ifindex)
ifps[i] = NULL;
else {
selection = selection ? selection : ifps[i];
candidates++;
}
}
if (ifps_cnt)
XFREE(MTYPE_TMP, ifps);
char ethstr[ETHER_ADDR_STRLEN];
prefix_mac2str(&r->vmac, ethstr, sizeof(ethstr));
assert(!!selection == !!candidates);
if (candidates == 0)
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Interface: None (no interface found w/ MAC %s)",
r->vr->vrid, family2str(r->family), ethstr);
else if (candidates > 1)
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Interface: Multiple interfaces found; using %s",
r->vr->vrid, family2str(r->family), selection->name);
else
zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Interface: %s",
r->vr->vrid, family2str(r->family), selection->name);
r->mvl_ifp = selection;
return !!r->mvl_ifp;
}
static struct vrrp_router *vrrp_router_create(struct vrrp_vrouter *vr,
int family)
{
struct vrrp_router *r =
XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_router));
r->family = family;
r->sock_rx = -1;
r->sock_tx = -1;
r->vr = vr;
r->addrs = list_new();
r->addrs->del = vrrp_router_addr_list_del_cb;
r->priority = vr->priority;
r->fsm.state = VRRP_STATE_INITIALIZE;
vrrp_mac_set(&r->vmac, family == AF_INET6, vr->vrid);
vrrp_attach_interface(r);
return r;
}
static void vrrp_router_destroy(struct vrrp_router *r)
{
if (r->is_active)
vrrp_event(r, VRRP_EVENT_SHUTDOWN);
if (r->sock_rx >= 0)
close(r->sock_rx);
if (r->sock_tx >= 0)
close(r->sock_tx);
/* FIXME: also delete list elements */
list_delete(&r->addrs);
XFREE(MTYPE_VRRP_RTR, r);
}
struct vrrp_vrouter *vrrp_vrouter_create(struct interface *ifp, uint8_t vrid,
uint8_t version)
{
struct vrrp_vrouter *vr = vrrp_lookup(ifp, vrid);
if (vr)
return vr;
if (version != 2 && version != 3)
return NULL;
vr = XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_vrouter));
vr->ifp = ifp;
vr->version = version;
vr->vrid = vrid;
vr->priority = vd.priority;
vr->preempt_mode = vd.preempt_mode;
vr->accept_mode = vd.accept_mode;
vr->shutdown = vd.shutdown;
vr->v4 = vrrp_router_create(vr, AF_INET);
vr->v6 = vrrp_router_create(vr, AF_INET6);
vrrp_set_advertisement_interval(vr, vd.advertisement_interval);
hash_get(vrrp_vrouters_hash, vr, hash_alloc_intern);
return vr;
}
void vrrp_vrouter_destroy(struct vrrp_vrouter *vr)
{
vrrp_router_destroy(vr->v4);
vrrp_router_destroy(vr->v6);
hash_release(vrrp_vrouters_hash, vr);
XFREE(MTYPE_VRRP_RTR, vr);
}
struct vrrp_vrouter *vrrp_lookup(const struct interface *ifp, uint8_t vrid)
{
struct vrrp_vrouter vr;
vr.vrid = vrid;
vr.ifp = (struct interface *)ifp;
return hash_lookup(vrrp_vrouters_hash, &vr);
}
/* Network ----------------------------------------------------------------- */
/* Forward decls */
static void vrrp_change_state(struct vrrp_router *r, int to);
static int vrrp_adver_timer_expire(struct thread *thread);
static int vrrp_master_down_timer_expire(struct thread *thread);
/*
* Finds the first connected address of the appropriate family on a VRRP
* router's interface and binds the Tx socket of the VRRP router to that
* address.
*
* Also sets src field of vrrp_router.
*
* r
* VRRP router to operate on
*
* Returns:
* 0 on success
* -1 on failure
*/
static int vrrp_bind_to_primary_connected(struct vrrp_router *r)
{
char ipstr[INET6_ADDRSTRLEN];
struct interface *ifp;
/*
* A slight quirk: the RFC specifies that advertisements under IPv6 must
* be transmitted using the link local address of the source interface
*/
ifp = r->family == AF_INET ? r->vr->ifp : r->mvl_ifp;
struct listnode *ln;
struct connected *c = NULL;
for (ALL_LIST_ELEMENTS_RO(ifp->connected, ln, c))
if (c->address->family == r->family) {
if (r->family == AF_INET6
&& IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6))
break;
else if (r->family == AF_INET)
break;
}
if (c == NULL) {
zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Failed to find address to bind on %s",
r->vr->vrid, family2str(r->family), ifp->name);
return -1;
}
union sockunion su;
memset(&su, 0x00, sizeof(su));
switch (r->family) {
case AF_INET:
r->src.ipa_type = IPADDR_V4;
r->src.ipaddr_v4 = c->address->u.prefix4;
su.sin.sin_family = AF_INET;
su.sin.sin_addr = c->address->u.prefix4;
break;
case AF_INET6:
r->src.ipa_type = IPADDR_V6;
r->src.ipaddr_v6 = c->address->u.prefix6;
su.sin6.sin6_family = AF_INET6;
su.sin6.sin6_scope_id = ifp->ifindex;
su.sin6.sin6_addr = c->address->u.prefix6;
break;
}
int ret = 0;
sockopt_reuseaddr(r->sock_tx);
if (bind(r->sock_tx, (const struct sockaddr *)&su, sizeof(su)) < 0) {
zlog_err(
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Failed to bind Tx socket to primary IP address %s: %s",
r->vr->vrid, family2str(r->family),
inet_ntop(r->family,
(const void *)&c->address->u.prefix, ipstr,
sizeof(ipstr)),
safe_strerror(errno));
ret = -1;
} else {
DEBUGD(&vrrp_dbg_sock,
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Bound Tx socket to primary IP address %s",
r->vr->vrid, family2str(r->family),
inet_ntop(r->family, (const void *)&c->address->u.prefix,
ipstr, sizeof(ipstr)));
}
return ret;
}
/*
* Create and multicast a VRRP ADVERTISEMENT message.
*
* r
* VRRP Router for which to send ADVERTISEMENT
*/
static void vrrp_send_advertisement(struct vrrp_router *r)
{
struct vrrp_pkt *pkt;
ssize_t pktsz;
struct ipaddr *addrs[r->addrs->count];
union sockunion dest;
if (r->src.ipa_type == IPADDR_NONE
&& vrrp_bind_to_primary_connected(r) < 0)
return;
list_to_array(r->addrs, (void **)addrs, r->addrs->count);
pktsz = vrrp_pkt_adver_build(&pkt, &r->src, r->vr->version, r->vr->vrid,
r->priority, r->vr->advertisement_interval,
r->addrs->count, (struct ipaddr **)&addrs);
if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt, DEBUG_MODE_ALL))
zlog_hexdump(pkt, (size_t)pktsz);
const char *group = r->family == AF_INET ? VRRP_MCASTV4_GROUP_STR
: VRRP_MCASTV6_GROUP_STR;
(void)str2sockunion(group, &dest);
ssize_t sent = sendto(r->sock_tx, pkt, (size_t)pktsz, 0, &dest.sa,
sockunion_sizeof(&dest));
vrrp_pkt_free(pkt);
if (sent < 0) {
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Failed to send VRRP Advertisement: %s",
r->vr->vrid, family2str(r->family),
safe_strerror(errno));
} else {
++r->stats.adver_tx_cnt;
}
}
/*
* Receive and parse VRRP advertisement.
*
* By the time we get here all fields have been validated for basic correctness
* and the packet is a valid VRRP packet.
*
* However, we have not validated whether the VRID is correct for this virtual
* router, nor whether the priority is correct (i.e. is not 255 when we are the
* address owner), nor whether the advertisement interval equals our own
* configured value (this check is only performed in VRRPv2).
*
* r
* VRRP Router associated with the socket this advertisement was received on
*
* src
* Source address of sender
*
* pkt
* The advertisement they sent
*
* pktsize
* Size of advertisement
*
* Returns:
* -1 if advertisement is invalid
* 0 otherwise
*/
static int vrrp_recv_advertisement(struct vrrp_router *r, struct ipaddr *src,
struct vrrp_pkt *pkt, size_t pktsize)
{
char sipstr[INET6_ADDRSTRLEN];
char dipstr[INET6_ADDRSTRLEN];
ipaddr2str(src, sipstr, sizeof(sipstr));
ipaddr2str(&r->src, dipstr, sizeof(dipstr));
char dumpbuf[BUFSIZ];
vrrp_pkt_adver_dump(dumpbuf, sizeof(dumpbuf), pkt);
DEBUGD(&vrrp_dbg_proto,
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Received VRRP Advertisement from %s:\n%s",
r->vr->vrid, family2str(r->family), sipstr, dumpbuf);
/* Check that VRID matches our configured VRID */
if (pkt->hdr.vrid != r->vr->vrid) {
DEBUGD(&vrrp_dbg_proto,
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Datagram invalid: Advertisement contains VRID %" PRIu8
" which does not match our instance",
r->vr->vrid, family2str(r->family), pkt->hdr.vrid);
return -1;
}
/* Verify that we are not the IPvX address owner */
if (r->is_owner) {
DEBUGD(&vrrp_dbg_proto,
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Datagram invalid: Received advertisement but we are the address owner",
r->vr->vrid, family2str(r->family));
return -1;
}
/* If v2, verify that adver time matches ours */
bool adveq = (pkt->hdr.v2.adver_int
== MAX(r->vr->advertisement_interval / 100, 1));
if (r->vr->version == 2 && !adveq) {
DEBUGD(&vrrp_dbg_proto,
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Datagram invalid: Received advertisement with advertisement interval %" PRIu8
" unequal to our configured value %u",
r->vr->vrid, family2str(r->family),
pkt->hdr.v2.adver_int,
MAX(r->vr->advertisement_interval / 100, 1));
return -1;
}
/* Check that # IPs received matches our # configured IPs */
if (pkt->hdr.naddr != r->addrs->count)
DEBUGD(&vrrp_dbg_proto,
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Datagram has %" PRIu8
" addresses, but this VRRP instance has %u",
r->vr->vrid, family2str(r->family), pkt->hdr.naddr,
r->addrs->count);
++r->stats.adver_rx_cnt;
int addrcmp;
switch (r->fsm.state) {
case VRRP_STATE_MASTER:
addrcmp = memcmp(&src->ip, &r->src.ip, IPADDRSZ(src));
if (pkt->hdr.priority == 0) {
vrrp_send_advertisement(r);
THREAD_OFF(r->t_adver_timer);
thread_add_timer_msec(
master, vrrp_adver_timer_expire, r,
r->vr->advertisement_interval * CS2MS,
&r->t_adver_timer);
} else if (pkt->hdr.priority > r->priority
|| ((pkt->hdr.priority == r->priority)
&& addrcmp > 0)) {
zlog_info(
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Received advertisement from %s w/ priority %" PRIu8
"; switching to Backup",
r->vr->vrid, family2str(r->family), sipstr,
pkt->hdr.priority);
THREAD_OFF(r->t_adver_timer);
if (r->vr->version == 3) {
r->master_adver_interval =
htons(pkt->hdr.v3.adver_int);
}
vrrp_recalculate_timers(r);
THREAD_OFF(r->t_master_down_timer);
thread_add_timer_msec(master,
vrrp_master_down_timer_expire, r,
r->master_down_interval * CS2MS,
&r->t_master_down_timer);
vrrp_change_state(r, VRRP_STATE_BACKUP);
} else {
/* Discard advertisement */
DEBUGD(&vrrp_dbg_proto,
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Discarding advertisement from %s (%" PRIu8
" <= %" PRIu8 " & %s <= %s)",
r->vr->vrid, family2str(r->family), sipstr,
pkt->hdr.priority, r->priority, sipstr, dipstr);
}
break;
case VRRP_STATE_BACKUP:
if (pkt->hdr.priority == 0) {
THREAD_OFF(r->t_master_down_timer);
thread_add_timer_msec(
master, vrrp_master_down_timer_expire, r,
r->skew_time * CS2MS, &r->t_master_down_timer);
} else if (!r->vr->preempt_mode
|| pkt->hdr.priority >= r->priority) {
if (r->vr->version == 3) {
r->master_adver_interval =
ntohs(pkt->hdr.v3.adver_int);
}
vrrp_recalculate_timers(r);
THREAD_OFF(r->t_master_down_timer);
thread_add_timer_msec(master,
vrrp_master_down_timer_expire, r,
r->master_down_interval * CS2MS,
&r->t_master_down_timer);
} else if (r->vr->preempt_mode
&& pkt->hdr.priority < r->priority) {
/* Discard advertisement */
DEBUGD(&vrrp_dbg_proto,
VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Discarding advertisement from %s (%" PRIu8
" < %" PRIu8 " & preempt = true)",
r->vr->vrid, family2str(r->family), sipstr,
pkt->hdr.priority, r->priority);
}
break;
case VRRP_STATE_INITIALIZE:
zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
"Received ADVERTISEMENT in state %s; this is a bug",
r->vr->vrid, family2str(r->family),
vrrp_state_names[r->fsm.state]);
break;
}
return 0;
}
/*
* Read and process next IPvX datagram.
*/
static int vrrp_read(struct thread *thread)
{
struct vrrp_router *r = thread->arg;