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zebra: Refactor kernel_rtm to be a bit smarter about how it handles options
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
parent
08ea27d112
commit
86afd5292f
@ -135,6 +135,19 @@ static int kernel_rtm(int cmd, const struct prefix *p,
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if (IS_ZEBRA_DEBUG_RIB)
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prefix2str(p, prefix_buf, sizeof(prefix_buf));
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/*
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* We only have the ability to ADD or DELETE at this point
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* in time.
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*/
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if (cmd != RTM_ADD && cmd != RTM_DELETE) {
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: %s odd command %s for flags %d",
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__func__, prefix_buf,
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lookup_msg(rtm_type_str, cmd, NULL),
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nexthop->flags);
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return 0;
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}
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memset(&sin_dest, 0, sizeof(sin_dest));
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memset(&sin_gate, 0, sizeof(sin_gate));
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memset(&sin_mask, 0, sizeof(sin_mask));
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@ -164,32 +177,29 @@ static int kernel_rtm(int cmd, const struct prefix *p,
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/* Make gateway. */
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for (ALL_NEXTHOPS_PTR(ng, nexthop)) {
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if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
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/*
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* We only want to use the actual good nexthops
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*/
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if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE) ||
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!CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE))
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continue;
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gate = 0;
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char gate_buf[INET_ADDRSTRLEN] = "NULL";
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/*
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* XXX We need to refrain from kernel operations in some cases,
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* but this if statement seems overly cautious - what about
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* other than ADD and DELETE?
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*/
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if ((cmd == RTM_ADD && NEXTHOP_IS_ACTIVE(nexthop->flags))
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|| (cmd == RTM_DELETE)) {
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switch (nexthop->type) {
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case NEXTHOP_TYPE_IPV4:
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case NEXTHOP_TYPE_IPV4_IFINDEX:
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sin_gate.sin.sin_addr = nexthop->gate.ipv4;
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sin_gate.sin.sin_family = AF_INET;
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ifindex = nexthop->ifindex;
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gate = 1;
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break;
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case NEXTHOP_TYPE_IPV6:
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case NEXTHOP_TYPE_IPV6_IFINDEX:
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sin_gate.sin6.sin6_addr = nexthop->gate.ipv6;
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sin_gate.sin6.sin6_family = AF_INET6;
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ifindex = nexthop->ifindex;
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switch (nexthop->type) {
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case NEXTHOP_TYPE_IPV4:
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case NEXTHOP_TYPE_IPV4_IFINDEX:
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sin_gate.sin.sin_addr = nexthop->gate.ipv4;
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sin_gate.sin.sin_family = AF_INET;
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ifindex = nexthop->ifindex;
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gate = 1;
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break;
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case NEXTHOP_TYPE_IPV6:
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case NEXTHOP_TYPE_IPV6_IFINDEX:
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sin_gate.sin6.sin6_addr = nexthop->gate.ipv6;
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sin_gate.sin6.sin6_family = AF_INET6;
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ifindex = nexthop->ifindex;
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/* Under kame set interface index to link local address */
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#ifdef KAME
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@ -199,132 +209,118 @@ static int kernel_rtm(int cmd, const struct prefix *p,
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(a).s6_addr[3] = (i)&0xff; \
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} while (0)
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if (IN6_IS_ADDR_LINKLOCAL(
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&sin_gate.sin6.sin6_addr))
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SET_IN6_LINKLOCAL_IFINDEX(
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sin_gate.sin6.sin6_addr,
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ifindex);
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if (IN6_IS_ADDR_LINKLOCAL(&sin_gate.sin6.sin6_addr))
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SET_IN6_LINKLOCAL_IFINDEX(
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sin_gate.sin6.sin6_addr,
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ifindex);
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#endif /* KAME */
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gate = 1;
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break;
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case NEXTHOP_TYPE_IFINDEX:
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ifindex = nexthop->ifindex;
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break;
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case NEXTHOP_TYPE_BLACKHOLE:
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bh_type = nexthop->bh_type;
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switch (p->family) {
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case AFI_IP: {
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struct in_addr loopback;
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loopback.s_addr =
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htonl(INADDR_LOOPBACK);
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sin_gate.sin.sin_addr = loopback;
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gate = 1;
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}
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break;
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case AFI_IP6:
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break;
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}
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}
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gate = 1;
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break;
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case NEXTHOP_TYPE_IFINDEX:
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ifindex = nexthop->ifindex;
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break;
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case NEXTHOP_TYPE_BLACKHOLE:
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bh_type = nexthop->bh_type;
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switch (p->family) {
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case AF_INET:
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if (gate && p->prefixlen == 32)
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mask = NULL;
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else {
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masklen2ip(p->prefixlen,
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&sin_mask.sin.sin_addr);
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sin_mask.sin.sin_family = AF_INET;
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#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
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sin_mask.sin.sin_len = sin_masklen(
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sin_mask.sin.sin_addr);
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#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
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mask = &sin_mask;
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}
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case AFI_IP: {
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struct in_addr loopback;
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loopback.s_addr = htonl(INADDR_LOOPBACK);
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sin_gate.sin.sin_addr = loopback;
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gate = 1;
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}
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break;
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case AF_INET6:
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if (gate && p->prefixlen == 128)
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mask = NULL;
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else {
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masklen2ip6(p->prefixlen,
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&sin_mask.sin6.sin6_addr);
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sin_mask.sin6.sin6_family = AF_INET6;
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#ifdef SIN6_LEN
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sin_mask.sin6.sin6_len = sin6_masklen(
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sin_mask.sin6.sin6_addr);
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#endif /* SIN6_LEN */
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mask = &sin_mask;
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}
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case AFI_IP6:
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break;
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}
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}
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switch (p->family) {
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case AF_INET:
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if (gate && p->prefixlen == 32)
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mask = NULL;
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else {
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masklen2ip(p->prefixlen,
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&sin_mask.sin.sin_addr);
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sin_mask.sin.sin_family = AF_INET;
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#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
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sin_mask.sin.sin_len = sin_masklen(
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sin_mask.sin.sin_addr);
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#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
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mask = &sin_mask;
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}
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break;
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case AF_INET6:
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if (gate && p->prefixlen == 128)
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mask = NULL;
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else {
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masklen2ip6(p->prefixlen,
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&sin_mask.sin6.sin6_addr);
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sin_mask.sin6.sin6_family = AF_INET6;
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#ifdef SIN6_LEN
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sin_mask.sin6.sin6_len = sin6_masklen(
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sin_mask.sin6.sin6_addr);
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#endif /* SIN6_LEN */
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mask = &sin_mask;
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}
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break;
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}
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#ifdef __OpenBSD__
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if (nexthop->nh_label
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&& !kernel_rtm_add_labels(nexthop->nh_label,
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&smpls))
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continue;
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smplsp = (union sockunion *)&smpls;
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if (nexthop->nh_label
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&& !kernel_rtm_add_labels(nexthop->nh_label, &smpls))
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continue;
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smplsp = (union sockunion *)&smpls;
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#endif
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error = rtm_write(cmd, &sin_dest, mask,
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gate ? &sin_gate : NULL, smplsp,
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ifindex, bh_type, metric);
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error = rtm_write(cmd, &sin_dest, mask,
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gate ? &sin_gate : NULL, smplsp,
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ifindex, bh_type, metric);
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if (IS_ZEBRA_DEBUG_KERNEL) {
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if (!gate) {
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zlog_debug(
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"%s: %s: attention! gate not found for re",
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__func__, prefix_buf);
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} else
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inet_ntop(p->family == AFI_IP ? AF_INET
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: AF_INET6,
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&sin_gate.sin.sin_addr,
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gate_buf, INET_ADDRSTRLEN);
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}
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switch (error) {
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/* We only flag nexthops as being in FIB if
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* rtm_write() did its work. */
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case ZEBRA_ERR_NOERROR:
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nexthop_num++;
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug(
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"%s: %s: successfully did NH %s",
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__func__, prefix_buf, gate_buf);
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if (cmd == RTM_ADD)
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SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
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break;
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if (IS_ZEBRA_DEBUG_KERNEL) {
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if (!gate) {
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zlog_debug("%s: %s: attention! gate not found for re",
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__func__, prefix_buf);
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} else
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inet_ntop(p->family == AFI_IP ? AF_INET
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: AF_INET6,
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&sin_gate.sin.sin_addr,
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gate_buf, INET_ADDRSTRLEN);
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}
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switch (error) {
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/* We only flag nexthops as being in FIB if
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* rtm_write() did its work. */
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case ZEBRA_ERR_NOERROR:
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nexthop_num++;
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: %s: successfully did NH %s",
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__func__, prefix_buf, gate_buf);
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if (cmd == RTM_ADD)
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SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
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break;
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/* The only valid case for this error is
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* kernel's failure to install a multipath
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* route, which is common for FreeBSD. This
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* should be
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* ignored silently, but logged as an error
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* otherwise.
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*/
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case ZEBRA_ERR_RTEXIST:
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if (cmd != RTM_ADD)
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flog_err(
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EC_LIB_SYSTEM_CALL,
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"%s: rtm_write() returned %d for command %d",
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__func__, error, cmd);
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continue;
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/* The only valid case for this error is
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* kernel's failure to install a multipath
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* route, which is common for FreeBSD. This
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* should be ignored silently, but logged as an error
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* otherwise.
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*/
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case ZEBRA_ERR_RTEXIST:
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if (cmd != RTM_ADD)
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flog_err(EC_LIB_SYSTEM_CALL,
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"%s: rtm_write() returned %d for command %d",
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__func__, error, cmd);
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continue;
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/* Note any unexpected status returns */
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default:
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flog_err(
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EC_LIB_SYSTEM_CALL,
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"%s: %s: rtm_write() unexpectedly returned %d for command %s",
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__func__,
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prefix2str(p, prefix_buf,
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sizeof(prefix_buf)),
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error,
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lookup_msg(rtm_type_str, cmd, NULL));
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break;
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}
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} /* if (cmd and flags make sense) */
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else if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: odd command %s for flags %d", __func__,
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lookup_msg(rtm_type_str, cmd, NULL),
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nexthop->flags);
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/* Note any unexpected status returns */
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default:
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flog_err(EC_LIB_SYSTEM_CALL,
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"%s: %s: rtm_write() unexpectedly returned %d for command %s",
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__func__,
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prefix2str(p, prefix_buf,
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sizeof(prefix_buf)),
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error, lookup_msg(rtm_type_str, cmd, NULL));
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break;
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}
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} /* for (ALL_NEXTHOPS(...))*/
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/* If there was no useful nexthop, then complain. */
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