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zebra: add interface address apis for dplane
Add new apis for dplane interface address handling, based on the existing api. The existing api is basically split in two: the first part processes an incoming netlink message in the dplane pthread, creating a dplane context with info about the event. The second part runs in the main pthread and uses the context data to update an interface or connected object. Signed-off-by: Mark Stapp <mjs.ietf@gmail.com>
This commit is contained in:
Mark Stapp
parent
9d59df634c
commit
e7c2c1985c
@ -1443,7 +1443,6 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
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NULL, ifa->ifa_prefixlen);
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}
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/*
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* Linux kernel does not send route delete on interface down/addr del
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* so we have to re-process routes it owns (i.e. kernel routes)
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@ -1454,6 +1453,323 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
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return 0;
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}
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/*
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* Parse and validate an incoming interface address change message,
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* generating a dplane context object.
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* This runs in the dplane pthread; the context is enqueued to the
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* main pthread for processing.
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*/
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int netlink_interface_addr_dplane(struct nlmsghdr *h, ns_id_t ns_id,
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int startup /*ignored*/)
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{
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int len;
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struct ifaddrmsg *ifa;
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struct rtattr *tb[IFA_MAX + 1];
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void *addr;
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void *broad;
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char *label = NULL;
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uint32_t metric = METRIC_MAX;
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uint32_t kernel_flags = 0;
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struct zebra_dplane_ctx *ctx;
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struct prefix p;
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ifa = NLMSG_DATA(h);
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/* Validate message types */
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if (h->nlmsg_type != RTM_NEWADDR && h->nlmsg_type != RTM_DELADDR)
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return 0;
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if (ifa->ifa_family != AF_INET && ifa->ifa_family != AF_INET6) {
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: %s: Invalid address family: %u",
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__func__, nl_msg_type_to_str(h->nlmsg_type),
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ifa->ifa_family);
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return 0;
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}
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len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct ifaddrmsg));
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if (len < 0) {
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: %s: netlink msg bad size: %d %zu",
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__func__, nl_msg_type_to_str(h->nlmsg_type),
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h->nlmsg_len,
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(size_t)NLMSG_LENGTH(
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sizeof(struct ifaddrmsg)));
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return -1;
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}
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netlink_parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), len);
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/* Flags passed through */
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if (tb[IFA_FLAGS])
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kernel_flags = *(int *)RTA_DATA(tb[IFA_FLAGS]);
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else
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kernel_flags = ifa->ifa_flags;
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if (IS_ZEBRA_DEBUG_KERNEL) { /* remove this line to see initial ifcfg */
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char buf[PREFIX_STRLEN];
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zlog_debug("%s: %s nsid %u ifindex %u flags 0x%x:", __func__,
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nl_msg_type_to_str(h->nlmsg_type), ns_id,
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ifa->ifa_index, kernel_flags);
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if (tb[IFA_LOCAL])
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zlog_debug(" IFA_LOCAL %s/%d",
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inet_ntop(ifa->ifa_family,
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RTA_DATA(tb[IFA_LOCAL]), buf,
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sizeof(buf)),
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ifa->ifa_prefixlen);
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if (tb[IFA_ADDRESS])
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zlog_debug(" IFA_ADDRESS %s/%d",
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inet_ntop(ifa->ifa_family,
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RTA_DATA(tb[IFA_ADDRESS]), buf,
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sizeof(buf)),
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ifa->ifa_prefixlen);
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if (tb[IFA_BROADCAST])
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zlog_debug(" IFA_BROADCAST %s/%d",
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inet_ntop(ifa->ifa_family,
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RTA_DATA(tb[IFA_BROADCAST]), buf,
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sizeof(buf)),
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ifa->ifa_prefixlen);
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if (tb[IFA_LABEL])
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zlog_debug(" IFA_LABEL %s",
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(const char *)RTA_DATA(tb[IFA_LABEL]));
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if (tb[IFA_CACHEINFO]) {
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struct ifa_cacheinfo *ci = RTA_DATA(tb[IFA_CACHEINFO]);
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zlog_debug(" IFA_CACHEINFO pref %d, valid %d",
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ci->ifa_prefered, ci->ifa_valid);
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}
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}
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/* Validate prefix length */
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if (ifa->ifa_family == AF_INET
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&& ifa->ifa_prefixlen > IPV4_MAX_BITLEN) {
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: %s: Invalid prefix length: %u",
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__func__, nl_msg_type_to_str(h->nlmsg_type),
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ifa->ifa_prefixlen);
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return -1;
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}
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if (ifa->ifa_family == AF_INET6) {
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if (ifa->ifa_prefixlen > IPV6_MAX_BITLEN) {
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: %s: Invalid prefix length: %u",
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__func__,
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nl_msg_type_to_str(h->nlmsg_type),
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ifa->ifa_prefixlen);
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return -1;
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}
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/* Only consider valid addresses; we'll not get a kernel
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* notification till IPv6 DAD has completed, but at init
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* time, FRR does query for and will receive all addresses.
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*/
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if (h->nlmsg_type == RTM_NEWADDR
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&& (kernel_flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))) {
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: %s: Invalid/tentative addr",
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__func__,
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nl_msg_type_to_str(h->nlmsg_type));
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return 0;
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}
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}
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/* logic copied from iproute2/ip/ipaddress.c:print_addrinfo() */
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if (tb[IFA_LOCAL] == NULL)
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tb[IFA_LOCAL] = tb[IFA_ADDRESS];
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if (tb[IFA_ADDRESS] == NULL)
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tb[IFA_ADDRESS] = tb[IFA_LOCAL];
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/* local interface address */
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addr = (tb[IFA_LOCAL] ? RTA_DATA(tb[IFA_LOCAL]) : NULL);
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/* addr is primary key, SOL if we don't have one */
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if (addr == NULL) {
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: %s: No local interface address",
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__func__, nl_msg_type_to_str(h->nlmsg_type));
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return -1;
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}
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/* Allocate a context object, now that validation is done. */
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ctx = dplane_ctx_alloc();
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if (h->nlmsg_type == RTM_NEWADDR)
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dplane_ctx_set_op(ctx, DPLANE_OP_INTF_ADDR_ADD);
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else
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dplane_ctx_set_op(ctx, DPLANE_OP_INTF_ADDR_DEL);
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dplane_ctx_set_ifindex(ctx, ifa->ifa_index);
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dplane_ctx_set_ns_id(ctx, ns_id);
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/* Convert addr to prefix */
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memset(&p, 0, sizeof(p));
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p.family = ifa->ifa_family;
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p.prefixlen = ifa->ifa_prefixlen;
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if (p.family == AF_INET)
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p.u.prefix4 = *(struct in_addr *)addr;
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else
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p.u.prefix6 = *(struct in6_addr *)addr;
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dplane_ctx_set_intf_addr(ctx, &p);
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/* is there a peer address? */
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if (tb[IFA_ADDRESS]
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&& memcmp(RTA_DATA(tb[IFA_ADDRESS]), RTA_DATA(tb[IFA_LOCAL]),
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RTA_PAYLOAD(tb[IFA_ADDRESS]))) {
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broad = RTA_DATA(tb[IFA_ADDRESS]);
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dplane_ctx_intf_set_connected(ctx);
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} else if (tb[IFA_BROADCAST]) {
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/* seeking a broadcast address */
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broad = RTA_DATA(tb[IFA_BROADCAST]);
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dplane_ctx_intf_set_broadcast(ctx);
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} else
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broad = NULL;
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if (broad) {
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/* Convert addr to prefix */
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memset(&p, 0, sizeof(p));
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p.family = ifa->ifa_family;
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p.prefixlen = ifa->ifa_prefixlen;
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if (p.family == AF_INET)
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p.u.prefix4 = *(struct in_addr *)broad;
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else
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p.u.prefix6 = *(struct in6_addr *)broad;
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dplane_ctx_set_intf_dest(ctx, &p);
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}
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/* Flags. */
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if (kernel_flags & IFA_F_SECONDARY)
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dplane_ctx_intf_set_secondary(ctx);
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/* Label */
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if (tb[IFA_LABEL]) {
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label = (char *)RTA_DATA(tb[IFA_LABEL]);
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dplane_ctx_set_intf_label(ctx, label);
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}
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if (tb[IFA_RT_PRIORITY])
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metric = *(uint32_t *)RTA_DATA(tb[IFA_RT_PRIORITY]);
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dplane_ctx_set_intf_metric(ctx, metric);
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/* Enqueue ctx for main pthread to process */
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dplane_provider_enqueue_to_zebra(ctx);
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return 0;
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}
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/*
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* Handle an interface addr event based on info in a dplane context object.
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* This runs in the main pthread, using the info in the context object to
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* modify an interface.
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*/
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int netlink_interface_addr_ctx(struct zebra_dplane_ctx *ctx)
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{
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int ret = -1;
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struct interface *ifp;
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uint8_t flags = 0;
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const char *label = NULL;
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ns_id_t ns_id;
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struct zebra_ns *zns;
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uint32_t metric = METRIC_MAX;
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ifindex_t ifindex;
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const struct prefix *addr, *dest = NULL;
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enum dplane_op_e op;
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op = dplane_ctx_get_op(ctx);
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ns_id = dplane_ctx_get_ns_id(ctx);
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zns = zebra_ns_lookup(ns_id);
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if (zns == NULL) {
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/* No ns - deleted maybe? */
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: can't find zns id %u", __func__, ns_id);
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goto done;
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}
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ifindex = dplane_ctx_get_ifindex(ctx);
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ifp = if_lookup_by_index_per_ns(zns, ifindex);
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if (ifp == NULL) {
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: can't find ifp at nsid %u index %d",
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__func__, ns_id, ifindex);
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goto done;
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}
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addr = dplane_ctx_get_intf_addr(ctx);
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_debug("%s: %s: ifindex %u, addr %pFX", __func__,
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dplane_op2str(op), ifindex, addr);
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/* Is there a peer or broadcast address? */
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dest = dplane_ctx_get_intf_dest(ctx);
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if (dest->prefixlen == 0)
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dest = NULL;
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if (dplane_ctx_intf_is_connected(ctx))
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SET_FLAG(flags, ZEBRA_IFA_PEER);
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/* Flags. */
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if (dplane_ctx_intf_is_secondary(ctx))
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SET_FLAG(flags, ZEBRA_IFA_SECONDARY);
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/* Label? */
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if (dplane_ctx_intf_has_label(ctx))
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label = dplane_ctx_get_intf_label(ctx);
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if (label && strcmp(ifp->name, label) == 0)
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label = NULL;
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metric = dplane_ctx_get_intf_metric(ctx);
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/* Register interface address to the interface. */
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if (addr->family == AF_INET) {
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if (op == DPLANE_OP_INTF_ADDR_ADD)
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connected_add_ipv4(
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ifp, flags, &addr->u.prefix4, addr->prefixlen,
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dest ? &dest->u.prefix4 : NULL, label, metric);
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else if (CHECK_FLAG(flags, ZEBRA_IFA_PEER)) {
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/* Delete with a peer address */
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connected_delete_ipv4(ifp, flags, &addr->u.prefix4,
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addr->prefixlen,
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&dest->u.prefix4);
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} else
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connected_delete_ipv4(ifp, flags, &addr->u.prefix4,
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addr->prefixlen, NULL);
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}
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if (addr->family == AF_INET6) {
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if (op == DPLANE_OP_INTF_ADDR_ADD) {
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connected_add_ipv6(ifp, flags, &addr->u.prefix6,
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dest ? &dest->u.prefix6 : NULL,
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addr->prefixlen, label, metric);
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} else
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connected_delete_ipv6(ifp, &addr->u.prefix6, NULL,
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addr->prefixlen);
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}
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/*
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* Linux kernel does not send route delete on interface down/addr del
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* so we have to re-process routes it owns (i.e. kernel routes)
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*/
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if (op != DPLANE_OP_INTF_ADDR_ADD)
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rib_update(RIB_UPDATE_KERNEL);
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ret = 0;
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done:
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/* We're responsible for the ctx object */
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dplane_ctx_fini(&ctx);
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return ret;
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}
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int netlink_link_change(struct nlmsghdr *h, ns_id_t ns_id, int startup)
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{
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int len;
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@ -29,6 +29,17 @@ extern "C" {
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extern int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id,
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int startup);
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/*
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* Parse an incoming interface address change message, generate a dplane
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* context object for processing.
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*/
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int netlink_interface_addr_dplane(struct nlmsghdr *h, ns_id_t ns_id,
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int startup);
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/* Handle an interface addr change event. */
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int netlink_interface_addr_ctx(struct zebra_dplane_ctx *ctx);
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extern int netlink_link_change(struct nlmsghdr *h, ns_id_t ns_id, int startup);
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extern int interface_lookup_netlink(struct zebra_ns *zns);
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