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zebra: Refactor kernel_rtm to be a bit smarter about how it handles options

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The ADD/DELETE messages are the only ones we support, so leave
early from the function, in other words don't check it every
nexthop loop.

Additionally nexthops only care about non recursive active flags.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2018-12-17 18:21:38 -05:00
parent 08ea27d112
commit 86afd5292f
1 changed files with 131 additions and 135 deletions
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58
zebra/rt_socket.c
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@ -135,6 +135,19 @@ static int kernel_rtm(int cmd, const struct prefix *p,
if (IS_ZEBRA_DEBUG_RIB)
prefix2str(p, prefix_buf, sizeof(prefix_buf));
/*
* We only have the ability to ADD or DELETE at this point
* in time.
*/
if (cmd != RTM_ADD && cmd != RTM_DELETE) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: %s odd command %s for flags %d",
__func__, prefix_buf,
lookup_msg(rtm_type_str, cmd, NULL),
nexthop->flags);
return 0;
}
memset(&sin_dest, 0, sizeof(sin_dest));
memset(&sin_gate, 0, sizeof(sin_gate));
memset(&sin_mask, 0, sizeof(sin_mask));
@ -164,19 +177,16 @@ static int kernel_rtm(int cmd, const struct prefix *p,
/* Make gateway. */
for (ALL_NEXTHOPS_PTR(ng, nexthop)) {
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
/*
* We only want to use the actual good nexthops
*/
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE) ||
!CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE))
continue;
gate = 0;
char gate_buf[INET_ADDRSTRLEN] = "NULL";
/*
* XXX We need to refrain from kernel operations in some cases,
* but this if statement seems overly cautious - what about
* other than ADD and DELETE?
*/
if ((cmd == RTM_ADD && NEXTHOP_IS_ACTIVE(nexthop->flags))
|| (cmd == RTM_DELETE)) {
switch (nexthop->type) {
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
@ -199,8 +209,7 @@ static int kernel_rtm(int cmd, const struct prefix *p,
(a).s6_addr[3] = (i)&0xff; \
} while (0)
if (IN6_IS_ADDR_LINKLOCAL(
&sin_gate.sin6.sin6_addr))
if (IN6_IS_ADDR_LINKLOCAL(&sin_gate.sin6.sin6_addr))
SET_IN6_LINKLOCAL_IFINDEX(
sin_gate.sin6.sin6_addr,
ifindex);
@ -216,8 +225,7 @@ static int kernel_rtm(int cmd, const struct prefix *p,
switch (p->family) {
case AFI_IP: {
struct in_addr loopback;
loopback.s_addr =
htonl(INADDR_LOOPBACK);
loopback.s_addr = htonl(INADDR_LOOPBACK);
sin_gate.sin.sin_addr = loopback;
gate = 1;
}
@ -260,8 +268,7 @@ static int kernel_rtm(int cmd, const struct prefix *p,
#ifdef __OpenBSD__
if (nexthop->nh_label
&& !kernel_rtm_add_labels(nexthop->nh_label,
&smpls))
&& !kernel_rtm_add_labels(nexthop->nh_label, &smpls))
continue;
smplsp = (union sockunion *)&smpls;
#endif
@ -271,8 +278,7 @@ static int kernel_rtm(int cmd, const struct prefix *p,
if (IS_ZEBRA_DEBUG_KERNEL) {
if (!gate) {
zlog_debug(
"%s: %s: attention! gate not found for re",
zlog_debug("%s: %s: attention! gate not found for re",
__func__, prefix_buf);
} else
inet_ntop(p->family == AFI_IP ? AF_INET
@ -286,8 +292,7 @@ static int kernel_rtm(int cmd, const struct prefix *p,
case ZEBRA_ERR_NOERROR:
nexthop_num++;
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"%s: %s: successfully did NH %s",
zlog_debug("%s: %s: successfully did NH %s",
__func__, prefix_buf, gate_buf);
if (cmd == RTM_ADD)
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
@ -296,35 +301,26 @@ static int kernel_rtm(int cmd, const struct prefix *p,
/* The only valid case for this error is
* kernel's failure to install a multipath
* route, which is common for FreeBSD. This
* should be
* ignored silently, but logged as an error
* should be ignored silently, but logged as an error
* otherwise.
*/
case ZEBRA_ERR_RTEXIST:
if (cmd != RTM_ADD)
flog_err(
EC_LIB_SYSTEM_CALL,
flog_err(EC_LIB_SYSTEM_CALL,
"%s: rtm_write() returned %d for command %d",
__func__, error, cmd);
continue;
/* Note any unexpected status returns */
default:
flog_err(
EC_LIB_SYSTEM_CALL,
flog_err(EC_LIB_SYSTEM_CALL,
"%s: %s: rtm_write() unexpectedly returned %d for command %s",
__func__,
prefix2str(p, prefix_buf,
sizeof(prefix_buf)),
error,
lookup_msg(rtm_type_str, cmd, NULL));
error, lookup_msg(rtm_type_str, cmd, NULL));
break;
}
} /* if (cmd and flags make sense) */
else if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: odd command %s for flags %d", __func__,
lookup_msg(rtm_type_str, cmd, NULL),
nexthop->flags);
} /* for (ALL_NEXTHOPS(...))*/
/* If there was no useful nexthop, then complain. */