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vrrpd: bind sockets to interfaces

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Bind Rx socket to inbound interface.

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2019-01-17 22:34:25 +00:00
parent 7e205b4a8f
commit b523b2419e
1 changed files with 92 additions and 14 deletions
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106
vrrpd/vrrp.c
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@ -602,8 +602,6 @@ static int vrrp_bind_to_primary_connected(struct vrrp_router *r)
* all transmitted IPvX packets
* - Requests the kernel to deliver IPv6 header values needed to validate VRRP
* packets
* - FIXME: Binds the Tx socket to the first address on the macvlan
* subinterface.
*
* If any of the above fail, the sockets are closed. The only exception is if
* the TTL / Hop Limit settings fail; these are logged, but configuration
@ -661,12 +659,58 @@ static int vrrp_socket(struct vrrp_router *r)
r->vr->vrid);
}
/* Bind Rx socket to exact interface */
vrrp_privs.change(ZPRIVS_RAISE);
{
ret = setsockopt(r->sock_rx, SOL_SOCKET,
SO_BINDTODEVICE, r->vr->ifp->name,
strlen(r->vr->ifp->name));
}
vrrp_privs.change(ZPRIVS_LOWER);
if (ret) {
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Failed to bind Rx socket to %s: %s",
r->vr->vrid, r->vr->ifp->name,
safe_strerror(errno));
failed = true;
goto done;
}
zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "Bound Rx socket to %s",
r->vr->vrid, r->vr->ifp->name);
/* Bind Rx socket to v4 multicast address */
struct sockaddr_in sa = {0};
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = htonl(VRRP_MCASTV4_GROUP);
if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) {
zlog_err(
VRRP_LOGPFX VRRP_LOGPFX_VRID
"Failed to bind Rx socket to VRRP %s multicast group: %s",
r->vr->vrid, family2str(r->family),
safe_strerror(errno));
failed = true;
goto done;
}
zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Bound Rx socket to VRRP %s multicast group",
r->vr->vrid, family2str(r->family));
/* Join Rx socket to VRRP IPv4 multicast group */
struct connected *c = listhead(r->vr->ifp->connected)->data;
struct in_addr v4 = c->address->u.prefix4;
ret = setsockopt_ipv4_multicast(r->sock_rx, IP_ADD_MEMBERSHIP,
v4, htonl(VRRP_MCASTV4_GROUP),
r->vr->ifp->ifindex);
if (ret < 0) {
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Failed to join VRRP %s multicast group",
r->vr->vrid, family2str(r->family));
failed = true;
goto done;
}
zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Joined %s VRRP multicast group",
r->vr->vrid, family2str(r->family));
/* Set outgoing interface for advertisements */
struct ip_mreqn mreqn = {};
@ -702,6 +746,42 @@ static int vrrp_socket(struct vrrp_router *r)
goto done;
}
/* Bind Rx socket to exact interface */
vrrp_privs.change(ZPRIVS_RAISE);
{
ret = setsockopt(r->sock_rx, SOL_SOCKET,
SO_BINDTODEVICE, r->vr->ifp->name,
strlen(r->vr->ifp->name));
}
vrrp_privs.change(ZPRIVS_LOWER);
if (ret) {
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Failed to bind Rx socket to %s: %s",
r->vr->vrid, r->vr->ifp->name,
safe_strerror(errno));
failed = true;
goto done;
}
zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID "Bound Rx socket to %s",
r->vr->vrid, r->vr->ifp->name);
/* Bind Rx socket to v6 multicast address */
struct sockaddr_in6 sa = {0};
sa.sin6_family = AF_INET6;
inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR, &sa.sin6_addr);
if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) {
zlog_err(
VRRP_LOGPFX VRRP_LOGPFX_VRID
"Failed to bind Rx socket to VRRP %s multicast group: %s",
r->vr->vrid, family2str(r->family),
safe_strerror(errno));
failed = true;
goto done;
}
zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Bound Rx socket to VRRP %s multicast group",
r->vr->vrid, family2str(r->family));
/* Join VRRP IPv6 multicast group */
struct ipv6_mreq mreq;
inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR,
@ -709,6 +789,16 @@ static int vrrp_socket(struct vrrp_router *r)
mreq.ipv6mr_interface = r->vr->ifp->ifindex;
ret = setsockopt(r->sock_rx, IPPROTO_IPV6, IPV6_JOIN_GROUP,
&mreq, sizeof(mreq));
if (ret < 0) {
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Failed to join VRRP %s multicast group",
r->vr->vrid, family2str(r->family));
failed = true;
goto done;
}
zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Joined %s VRRP multicast group",
r->vr->vrid, family2str(r->family));
/* Set outgoing interface for advertisements */
ret = setsockopt(r->sock_tx, IPPROTO_IPV6, IPV6_MULTICAST_IF,
@ -726,18 +816,6 @@ static int vrrp_socket(struct vrrp_router *r)
r->vr->vrid, r->mvl_ifp->name);
}
if (ret < 0) {
zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Failed to join VRRP %s multicast group",
r->vr->vrid, family2str(r->family));
failed = true;
goto done;
} else {
zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID
"Joined %s VRRP multicast group",
r->vr->vrid, family2str(r->family));
}
/* Bind Tx socket to link-local address */
if (vrrp_bind_to_primary_connected(r) < 0) {
failed = true;