Babel: Add source-specific routing support
This patch adds support for source-specific routing to the Babel protocol. It changes the protocol to support both NET_IP6 and NET_IP6_SADR channels for IPv6 addresses. If only a NET_IP6 channel is configured, source-specific updates are ignored. Otherwise, non-source-specific routes are simply treated as source-specific routes with SADR prefix 0. Thanks to Toke Hoiland-Jorgensen for the original patch. Minor changes by Ondrej Santiago Zajicek.
This commit is contained in:
Ondrej Zajicek (work)
parent
be17805c0b
commit
185a0a51f8
3 changed files with 224 additions and 28 deletions
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@ -1935,8 +1935,10 @@ babel_show_neighbors(struct proto *P, char *iff)
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}
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static void
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babel_show_entries_(struct babel_proto *p UNUSED, struct fib *rtable)
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babel_show_entries_(struct babel_proto *p, struct fib *rtable)
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{
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int width = babel_sadr_enabled(p) ? -54 : -24;
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FIB_WALK(rtable, struct babel_entry, e)
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{
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struct babel_route *r = NULL;
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@ -1950,13 +1952,13 @@ babel_show_entries_(struct babel_proto *p UNUSED, struct fib *rtable)
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srcs++;
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if (e->valid)
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cli_msg(-1025, "%-24N %-23lR %6u %5u %7u %7u",
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cli_msg(-1025, "%-*N %-23lR %6u %5u %7u %7u", width,
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e->n.addr, e->router_id, e->metric, e->seqno, rts, srcs);
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else if (r = e->selected)
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cli_msg(-1025, "%-24N %-23lR %6u %5u %7u %7u",
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cli_msg(-1025, "%-*N %-23lR %6u %5u %7u %7u", width,
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e->n.addr, r->router_id, r->metric, r->seqno, rts, srcs);
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else
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cli_msg(-1025, "%-24N %-23s %6s %5s %7u %7u",
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cli_msg(-1025, "%-*N %-23s %6s %5s %7u %7u", width,
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e->n.addr, "<none>", "-", "-", rts, srcs);
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}
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FIB_WALK_END;
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@ -1966,6 +1968,7 @@ void
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babel_show_entries(struct proto *P)
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{
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struct babel_proto *p = (void *) P;
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int width = babel_sadr_enabled(p) ? -54 : -24;
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if (p->p.proto_state != PS_UP)
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{
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@ -1975,7 +1978,7 @@ babel_show_entries(struct proto *P)
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}
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cli_msg(-1025, "%s:", p->p.name);
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cli_msg(-1025, "%-24s %-23s %6s %5s %7s %7s",
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cli_msg(-1025, "%-*s %-23s %6s %5s %7s %7s", width,
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"Prefix", "Router ID", "Metric", "Seqno", "Routes", "Sources");
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babel_show_entries_(p, &p->ip4_rtable);
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@ -1985,8 +1988,10 @@ babel_show_entries(struct proto *P)
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}
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static void
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babel_show_routes_(struct babel_proto *p UNUSED, struct fib *rtable)
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babel_show_routes_(struct babel_proto *p, struct fib *rtable)
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{
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int width = babel_sadr_enabled(p) ? -54 : -24;
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FIB_WALK(rtable, struct babel_entry, e)
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{
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struct babel_route *r;
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@ -1994,7 +1999,7 @@ babel_show_routes_(struct babel_proto *p UNUSED, struct fib *rtable)
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{
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char c = (r == e->selected) ? '*' : (r->feasible ? '+' : ' ');
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btime time = r->expires ? r->expires - current_time() : 0;
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cli_msg(-1025, "%-24N %-25I %-10s %5u %c %5u %7t",
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cli_msg(-1025, "%-*N %-25I %-10s %5u %c %5u %7t", width,
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e->n.addr, r->next_hop, r->neigh->ifa->ifname,
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r->metric, c, r->seqno, MAX(time, 0));
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}
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@ -2006,6 +2011,7 @@ void
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babel_show_routes(struct proto *P)
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{
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struct babel_proto *p = (void *) P;
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int width = babel_sadr_enabled(p) ? -54 : -24;
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if (p->p.proto_state != PS_UP)
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{
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@ -2015,7 +2021,7 @@ babel_show_routes(struct proto *P)
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}
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cli_msg(-1025, "%s:", p->p.name);
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cli_msg(-1025, "%-24s %-25s %-9s %6s F %5s %7s",
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cli_msg(-1025, "%-*s %-25s %-9s %6s F %5s %7s", width,
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"Prefix", "Nexthop", "Interface", "Metric", "Seqno", "Expires");
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babel_show_routes_(p, &p->ip4_rtable);
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@ -2182,14 +2188,32 @@ babel_rte_same(struct rte *new, struct rte *old)
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}
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static void
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babel_postconfig(struct proto_config *CF)
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{
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struct babel_config *cf = (void *) CF;
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struct channel_config *ip4, *ip6, *ip6_sadr;
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ip4 = proto_cf_find_channel(CF, NET_IP4);
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ip6 = proto_cf_find_channel(CF, NET_IP6);
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ip6_sadr = proto_cf_find_channel(CF, NET_IP6_SADR);
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if (ip6 && ip6_sadr)
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cf_error("Both ipv6 and ipv6-sadr channels");
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cf->ip4_channel = ip4;
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cf->ip6_channel = ip6 ?: ip6_sadr;
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}
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static struct proto *
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babel_init(struct proto_config *CF)
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{
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struct proto *P = proto_new(CF);
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struct babel_proto *p = (void *) P;
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struct babel_config *cf = (void *) CF;
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proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4));
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proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6));
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proto_configure_channel(P, &p->ip4_channel, cf->ip4_channel);
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proto_configure_channel(P, &p->ip6_channel, cf->ip6_channel);
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P->if_notify = babel_if_notify;
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P->rt_notify = babel_rt_notify;
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@ -2207,10 +2231,11 @@ babel_start(struct proto *P)
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{
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struct babel_proto *p = (void *) P;
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struct babel_config *cf = (void *) P->cf;
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u8 ip6_type = cf->ip6_channel ? cf->ip6_channel->net_type : NET_IP6;
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fib_init(&p->ip4_rtable, P->pool, NET_IP4, sizeof(struct babel_entry),
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OFFSETOF(struct babel_entry, n), 0, babel_init_entry);
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fib_init(&p->ip6_rtable, P->pool, NET_IP6, sizeof(struct babel_entry),
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fib_init(&p->ip6_rtable, P->pool, ip6_type, sizeof(struct babel_entry),
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OFFSETOF(struct babel_entry, n), 0, babel_init_entry);
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init_list(&p->interfaces);
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@ -2258,11 +2283,15 @@ babel_reconfigure(struct proto *P, struct proto_config *CF)
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{
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struct babel_proto *p = (void *) P;
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struct babel_config *new = (void *) CF;
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u8 ip6_type = new->ip6_channel ? new->ip6_channel->net_type : NET_IP6;
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TRACE(D_EVENTS, "Reconfiguring");
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if (!proto_configure_channel(P, &p->ip4_channel, proto_cf_find_channel(CF, NET_IP4)) ||
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!proto_configure_channel(P, &p->ip6_channel, proto_cf_find_channel(CF, NET_IP6)))
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if (p->ip6_rtable.addr_type != ip6_type)
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return 0;
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if (!proto_configure_channel(P, &p->ip4_channel, new->ip4_channel) ||
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!proto_configure_channel(P, &p->ip6_channel, new->ip6_channel))
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return 0;
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p->p.cf = CF;
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@ -2280,9 +2309,10 @@ struct protocol proto_babel = {
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.template = "babel%d",
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.attr_class = EAP_BABEL,
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.preference = DEF_PREF_BABEL,
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.channel_mask = NB_IP,
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.channel_mask = NB_IP | NB_IP6_SADR,
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.proto_size = sizeof(struct babel_proto),
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.config_size = sizeof(struct babel_config),
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.postconfig = babel_postconfig,
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.init = babel_init,
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.dump = babel_dump,
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.start = babel_start,
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@ -85,7 +85,10 @@ enum babel_tlv_type {
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enum babel_subtlv_type {
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BABEL_SUBTLV_PAD1 = 0,
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BABEL_SUBTLV_PADN = 1
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BABEL_SUBTLV_PADN = 1,
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/* Mandatory subtlvs */
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BABEL_SUBTLV_SOURCE_PREFIX = 128,
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};
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enum babel_iface_type {
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@ -109,6 +112,9 @@ struct babel_config {
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struct proto_config c;
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list iface_list; /* List of iface configs (struct babel_iface_config) */
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uint hold_time; /* Time to hold stale entries and unreachable routes */
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struct channel_config *ip4_channel;
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struct channel_config *ip6_channel;
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};
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struct babel_iface_config {
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@ -303,7 +309,10 @@ struct babel_msg_update {
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u16 seqno;
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u16 metric;
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u64 router_id;
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net_addr net;
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union {
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net_addr net;
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net_addr_ip6_sadr net_sadr;
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};
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ip_addr next_hop;
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ip_addr sender;
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};
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@ -311,7 +320,10 @@ struct babel_msg_update {
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struct babel_msg_route_request {
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u8 type;
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u8 full;
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net_addr net;
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union {
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net_addr net;
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net_addr_ip6_sadr net_sadr;
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};
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};
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struct babel_msg_seqno_request {
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@ -319,7 +331,10 @@ struct babel_msg_seqno_request {
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u8 hop_count;
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u16 seqno;
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u64 router_id;
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net_addr net;
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union {
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net_addr net;
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net_addr_ip6_sadr net_sadr;
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};
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ip_addr sender;
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};
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@ -339,6 +354,8 @@ struct babel_msg_node {
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union babel_msg msg;
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};
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static inline int babel_sadr_enabled(struct babel_proto *p)
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{ return p->ip6_rtable.addr_type == NET_IP6_SADR; }
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/* babel.c */
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void babel_handle_ack_req(union babel_msg *msg, struct babel_iface *ifa);
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@ -105,6 +105,13 @@ struct babel_tlv_seqno_request {
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u8 addr[0];
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} PACKED;
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struct babel_subtlv_source_prefix {
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u8 type;
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u8 length;
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u8 plen;
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u8 addr[0];
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} PACKED;
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/* Hello flags */
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#define BABEL_HF_UNICAST 0x8000
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@ -127,6 +134,7 @@ struct babel_parse_state {
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u8 def_ip6_prefix_seen; /* def_ip6_prefix is valid */
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u8 def_ip4_prefix_seen; /* def_ip4_prefix is valid */
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u8 current_tlv_endpos; /* End of self-terminating TLVs (offset from start) */
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u8 sadr_enabled;
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};
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enum parse_result {
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@ -237,6 +245,7 @@ static int babel_read_next_hop(struct babel_tlv *hdr, union babel_msg *msg, stru
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static int babel_read_update(struct babel_tlv *hdr, union babel_msg *msg, struct babel_parse_state *state);
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static int babel_read_route_request(struct babel_tlv *hdr, union babel_msg *msg, struct babel_parse_state *state);
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static int babel_read_seqno_request(struct babel_tlv *hdr, union babel_msg *msg, struct babel_parse_state *state);
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static int babel_read_source_prefix(struct babel_tlv *hdr, union babel_msg *msg, struct babel_parse_state *state);
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static uint babel_write_ack(struct babel_tlv *hdr, union babel_msg *msg, struct babel_write_state *state, uint max_len);
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static uint babel_write_hello(struct babel_tlv *hdr, union babel_msg *msg, struct babel_write_state *state, uint max_len);
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@ -244,6 +253,7 @@ static uint babel_write_ihu(struct babel_tlv *hdr, union babel_msg *msg, struct
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static uint babel_write_update(struct babel_tlv *hdr, union babel_msg *msg, struct babel_write_state *state, uint max_len);
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static uint babel_write_route_request(struct babel_tlv *hdr, union babel_msg *msg, struct babel_write_state *state, uint max_len);
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static uint babel_write_seqno_request(struct babel_tlv *hdr, union babel_msg *msg, struct babel_write_state *state, uint max_len);
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static int babel_write_source_prefix(struct babel_tlv *hdr, net_addr *net, uint max_len);
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struct babel_tlv_data {
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u8 min_length;
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@ -640,6 +650,9 @@ babel_read_update(struct babel_tlv *hdr, union babel_msg *m,
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ip6_addr prefix6 = get_ip6(buf);
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net_fill_ip6(&msg->net, prefix6, tlv->plen);
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if (state->sadr_enabled)
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net_make_ip6_sadr(&msg->net);
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if (tlv->flags & BABEL_UF_DEF_PREFIX)
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{
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put_ip6(state->def_ip6_prefix, prefix6);
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@ -770,12 +783,21 @@ babel_write_update(struct babel_tlv *hdr, union babel_msg *m,
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put_u16(&tlv->seqno, msg->seqno);
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put_u16(&tlv->metric, msg->metric);
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if (msg->net.type == NET_IP6_SADR)
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{
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int l = babel_write_source_prefix(hdr, &msg->net, max_len - (len0 + len));
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if (l < 0)
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return 0;
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len += l;
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}
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return len0 + len;
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}
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static int
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babel_read_route_request(struct babel_tlv *hdr, union babel_msg *m,
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struct babel_parse_state *state UNUSED)
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struct babel_parse_state *state)
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{
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struct babel_tlv_route_request *tlv = (void *) hdr;
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struct babel_msg_route_request *msg = &m->route_request;
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@ -812,6 +834,10 @@ babel_read_route_request(struct babel_tlv *hdr, union babel_msg *m,
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read_ip6_px(&msg->net, tlv->addr, tlv->plen);
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state->current_tlv_endpos += BYTES(tlv->plen);
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if (state->sadr_enabled)
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net_make_ip6_sadr(&msg->net);
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return PARSE_SUCCESS;
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case BABEL_AE_IP6_LL:
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@ -856,6 +882,15 @@ babel_write_route_request(struct babel_tlv *hdr, union babel_msg *m,
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put_ip6_px(tlv->addr, &msg->net);
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}
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if (msg->net.type == NET_IP6_SADR)
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{
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int l = babel_write_source_prefix(hdr, &msg->net, max_len - len);
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if (l < 0)
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return 0;
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len += l;
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}
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return len;
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}
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@ -900,6 +935,10 @@ babel_read_seqno_request(struct babel_tlv *hdr, union babel_msg *m,
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read_ip6_px(&msg->net, tlv->addr, tlv->plen);
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state->current_tlv_endpos += BYTES(tlv->plen);
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if (state->sadr_enabled)
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net_make_ip6_sadr(&msg->net);
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return PARSE_SUCCESS;
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case BABEL_AE_IP6_LL:
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@ -943,38 +982,147 @@ babel_write_seqno_request(struct babel_tlv *hdr, union babel_msg *m,
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tlv->hop_count = msg->hop_count;
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put_u64(&tlv->router_id, msg->router_id);
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if (msg->net.type == NET_IP6_SADR)
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{
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int l = babel_write_source_prefix(hdr, &msg->net, max_len - len);
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if (l < 0)
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return 0;
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len += l;
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}
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return len;
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}
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static int
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babel_read_source_prefix(struct babel_tlv *hdr, union babel_msg *msg,
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struct babel_parse_state *state UNUSED)
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{
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struct babel_subtlv_source_prefix *tlv = (void *) hdr;
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net_addr_ip6_sadr *net;
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/*
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* We would like to skip the sub-TLV if SADR is not enabled, but we do not
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* know AF of the enclosing TLV yet. We will do that later.
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*/
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/* Check internal consistency */
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if ((tlv->length < 1) ||
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(tlv->plen > IP6_MAX_PREFIX_LENGTH) ||
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(tlv->length < (1 + BYTES(tlv->plen))))
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return PARSE_ERROR;
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/* Plen MUST NOT be 0 */
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if (tlv->plen == 0)
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return PARSE_ERROR;
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switch(msg->type)
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{
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case BABEL_TLV_UPDATE:
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/* Wildcard updates with source prefix MUST be silently ignored */
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if (msg->update.wildcard)
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return PARSE_IGNORE;
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net = (void *) &msg->update.net;
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break;
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case BABEL_TLV_ROUTE_REQUEST:
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/* Wildcard requests with source addresses MUST be silently ignored */
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if (msg->route_request.full)
|
||||
return PARSE_IGNORE;
|
||||
|
||||
net = (void *) &msg->route_request.net;
|
||||
break;
|
||||
|
||||
case BABEL_TLV_SEQNO_REQUEST:
|
||||
net = (void *) &msg->seqno_request.net;
|
||||
break;
|
||||
|
||||
default:
|
||||
return PARSE_ERROR;
|
||||
}
|
||||
|
||||
/* If SADR is active, the net has appropriate type */
|
||||
if (net->type != NET_IP6_SADR)
|
||||
return PARSE_IGNORE;
|
||||
|
||||
/* Duplicate Source Prefix sub-TLV; SHOULD ignore whole TLV */
|
||||
if (net->src_pxlen > 0)
|
||||
return PARSE_IGNORE;
|
||||
|
||||
net_addr_ip6 src;
|
||||
read_ip6_px((void *) &src, tlv->addr, tlv->plen);
|
||||
net->src_prefix = src.prefix;
|
||||
net->src_pxlen = src.pxlen;
|
||||
|
||||
return PARSE_SUCCESS;
|
||||
}
|
||||
|
||||
static int
|
||||
babel_write_source_prefix(struct babel_tlv *hdr, net_addr *n, uint max_len)
|
||||
{
|
||||
struct babel_subtlv_source_prefix *tlv = (void *) NEXT_TLV(hdr);
|
||||
net_addr_ip6_sadr *net = (void *) n;
|
||||
|
||||
/* Do not use this sub-TLV for default prefix */
|
||||
if (net->src_pxlen == 0)
|
||||
return 0;
|
||||
|
||||
uint len = sizeof(*tlv) + BYTES(net->src_pxlen);
|
||||
|
||||
if (len > max_len)
|
||||
return -1;
|
||||
|
||||
TLV_HDR(tlv, BABEL_SUBTLV_SOURCE_PREFIX, len);
|
||||
hdr->length += len;
|
||||
|
||||
net_addr_ip6 src = NET_ADDR_IP6(net->src_prefix, net->src_pxlen);
|
||||
tlv->plen = src.pxlen;
|
||||
put_ip6_px(tlv->addr, (void *) &src);
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
|
||||
static inline int
|
||||
babel_read_subtlvs(struct babel_tlv *hdr,
|
||||
union babel_msg *msg UNUSED,
|
||||
union babel_msg *msg,
|
||||
struct babel_parse_state *state)
|
||||
{
|
||||
struct babel_tlv *tlv;
|
||||
byte *pos, *end = (byte *) hdr + TLV_LENGTH(hdr);
|
||||
int res;
|
||||
|
||||
for (tlv = (void *) hdr + state->current_tlv_endpos;
|
||||
(void *) tlv < (void *) hdr + TLV_LENGTH(hdr);
|
||||
(byte *) tlv < end;
|
||||
tlv = NEXT_TLV(tlv))
|
||||
{
|
||||
/* Ugly special case */
|
||||
if (tlv->type == BABEL_TLV_PAD1)
|
||||
continue;
|
||||
|
||||
/* The end of the common TLV header */
|
||||
pos = (byte *)tlv + sizeof(struct babel_tlv);
|
||||
if ((pos > end) || (pos + tlv->length > end))
|
||||
return PARSE_ERROR;
|
||||
|
||||
/*
|
||||
* The subtlv type space is non-contiguous (due to the mandatory bit), so
|
||||
* use a switch for dispatch instead of the mapping array we use for TLVs
|
||||
*/
|
||||
switch (tlv->type)
|
||||
{
|
||||
case BABEL_SUBTLV_PAD1:
|
||||
case BABEL_SUBTLV_PADN:
|
||||
/* FIXME: Framing errors in PADN are silently ignored, see babel_process_packet() */
|
||||
case BABEL_SUBTLV_SOURCE_PREFIX:
|
||||
res = babel_read_source_prefix(tlv, msg, state);
|
||||
if (res != PARSE_SUCCESS)
|
||||
return res;
|
||||
break;
|
||||
|
||||
case BABEL_SUBTLV_PADN:
|
||||
default:
|
||||
/* Unknown mandatory subtlv; PARSE_IGNORE ignores the whole TLV */
|
||||
if (tlv->type > 128)
|
||||
{
|
||||
DBG("Babel: Mandatory subtlv %d found; skipping TLV\n", tlv->type);
|
||||
if (tlv->type >= 128)
|
||||
return PARSE_IGNORE;
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
@ -1197,6 +1345,7 @@ babel_process_packet(struct babel_pkt_header *pkt, int len,
|
|||
.ifa = ifa,
|
||||
.saddr = saddr,
|
||||
.next_hop_ip6 = saddr,
|
||||
.sadr_enabled = babel_sadr_enabled(p),
|
||||
};
|
||||
|
||||
if ((pkt->magic != BABEL_MAGIC) || (pkt->version != BABEL_VERSION))
|
||||
|
|
|
|||
Loading…
Reference in a new issue