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vrrpd: use address cmp for priority tiebreak

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Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2019-02-01 21:22:18 +00:00
parent d04bb25ace
commit 0f1f98e837
1 changed files with 27 additions and 6 deletions
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33
vrrpd/vrrp.c
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@ -464,9 +464,25 @@ static void vrrp_send_advertisement(struct vrrp_router *r)
* 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).
*
* 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 vrrp_pkt *pkt,
size_t pktsize)
static int vrrp_recv_advertisement(struct vrrp_router *r, struct ipaddr *src,
struct vrrp_pkt *pkt, size_t pktsize)
{
char dumpbuf[BUFSIZ];
vrrp_pkt_adver_dump(dumpbuf, sizeof(dumpbuf), pkt);
@ -500,8 +516,14 @@ static int vrrp_recv_advertisement(struct vrrp_router *r, struct vrrp_pkt *pkt,
r->addrs->count);
}
int addrcmp;
size_t cmpsz = IS_IPADDR_V6(src) ? sizeof(struct in6_addr)
: sizeof(struct in_addr);
switch (r->fsm.state) {
case VRRP_STATE_MASTER:
addrcmp = memcmp(&src->ip, &r->src.ip, cmpsz);
if (pkt->hdr.priority == 0) {
vrrp_send_advertisement(r);
THREAD_OFF(r->t_adver_timer);
@ -509,9 +531,8 @@ static int vrrp_recv_advertisement(struct vrrp_router *r, struct vrrp_pkt *pkt,
master, vrrp_adver_timer_expire, r,
r->vr->advertisement_interval * 10,
&r->t_adver_timer);
/* FIXME: 6.4.3 mandates checking sender IP address */
} else if (pkt->hdr.priority > r->priority) {
zlog_err("NOT IMPLEMENTED");
} else if (pkt->hdr.priority > r->priority
|| ((pkt->hdr.priority == r->priority) && addrcmp > 0)) {
THREAD_OFF(r->t_adver_timer);
r->master_adver_interval = ntohs(pkt->hdr.v3.adver_int);
vrrp_recalculate_timers(r);
@ -606,7 +627,7 @@ static int vrrp_read(struct thread *thread)
} else {
zlog_debug(VRRP_LOGPFX VRRP_LOGPFX_VRID "Packet looks good",
r->vr->vrid);
vrrp_recv_advertisement(r, pkt, pktsize);
vrrp_recv_advertisement(r, &src, pkt, pktsize);
}
resched = true;