BFD: Option to specify which class of BFD sessions are accepted
Allows to configure IPv4/IPv6-only or direct/multihop-only BFD protocol instances.
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7f9adafc10
4 changed files with 61 additions and 6 deletions
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@ -1955,6 +1955,7 @@ milliseconds.
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<code>
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protocol bfd [<name>] {
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accept [ipv4|ipv6] [direct|multihop];
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interface <interface pattern> {
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interval <time>;
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min rx interval <time>;
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@ -1989,6 +1990,14 @@ protocol bfd [<name>] {
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</code>
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<descrip>
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<tag><label id="bfd-accept">accept [ipv4|ipv6] [direct|multihop]</tag>
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A BFD protocol instance accepts (by default) all BFD session requests
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(with regard to VRF restrictions, see above). This option controls
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whether IPv4 / IPv6 and direct / multihop session requests are accepted
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(and which listening sockets are opened). It can be used, for example,
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to configure separate BFD protocol instances for IPv4 and for IPv6
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sessions.
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<tag><label id="bfd-iface">interface <m/pattern/ [, <m/.../] { <m/options/ }</tag>
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Interface definitions allow to specify options for sessions associated
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with such interfaces and also may contain interface specific options.
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@ -624,9 +624,17 @@ bfd_request_notify(struct bfd_request *req, u8 state, u8 diag)
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static int
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bfd_add_request(struct bfd_proto *p, struct bfd_request *req)
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{
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struct bfd_config *cf = (struct bfd_config *) (p->p.cf);
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if (p->p.vrf_set && (p->p.vrf != req->vrf))
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return 0;
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if (ipa_is_ip4(req->addr) ? !cf->accept_ipv4 : !cf->accept_ipv6)
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return 0;
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if (req->iface ? !cf->accept_direct : !cf->accept_multihop)
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return 0;
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struct bfd_session *s = bfd_find_session_by_addr(p, req->addr);
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u8 state, diag;
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@ -986,10 +994,19 @@ bfd_start(struct proto *P)
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add_tail(&bfd_proto_list, &p->bfd_node);
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birdloop_enter(p->loop);
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p->rx4_1 = bfd_open_rx_sk(p, 0, SK_IPV4);
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p->rx4_m = bfd_open_rx_sk(p, 1, SK_IPV4);
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p->rx6_1 = bfd_open_rx_sk(p, 0, SK_IPV6);
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p->rx6_m = bfd_open_rx_sk(p, 1, SK_IPV6);
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if (cf->accept_ipv4 && cf->accept_direct)
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p->rx4_1 = bfd_open_rx_sk(p, 0, SK_IPV4);
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if (cf->accept_ipv4 && cf->accept_multihop)
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p->rx4_m = bfd_open_rx_sk(p, 1, SK_IPV4);
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if (cf->accept_ipv6 && cf->accept_direct)
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p->rx6_1 = bfd_open_rx_sk(p, 0, SK_IPV6);
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if (cf->accept_ipv6 && cf->accept_multihop)
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p->rx6_m = bfd_open_rx_sk(p, 1, SK_IPV6);
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birdloop_leave(p->loop);
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bfd_take_requests(p);
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@ -1034,10 +1051,17 @@ static int
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bfd_reconfigure(struct proto *P, struct proto_config *c)
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{
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struct bfd_proto *p = (struct bfd_proto *) P;
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// struct bfd_config *old = (struct bfd_config *) (P->cf);
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struct bfd_config *old = (struct bfd_config *) (P->cf);
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struct bfd_config *new = (struct bfd_config *) c;
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struct bfd_iface *ifa;
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/* TODO: Improve accept reconfiguration */
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if ((new->accept_ipv4 != old->accept_ipv4) ||
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(new->accept_ipv6 != old->accept_ipv6) ||
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(new->accept_direct != old->accept_direct) ||
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(new->accept_multihop != old->accept_multihop))
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return 0;
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birdloop_mask_wakeups(p->loop);
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WALK_LIST(ifa, p->iface_list)
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@ -43,6 +43,10 @@ struct bfd_config
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list patt_list; /* List of iface configs (struct bfd_iface_config) */
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list neigh_list; /* List of configured neighbors (struct bfd_neighbor) */
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struct bfd_iface_config *multihop; /* Multihop pseudoiface config */
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u8 accept_ipv4;
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u8 accept_ipv6;
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u8 accept_direct;
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u8 accept_multihop;
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};
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struct bfd_iface_config
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@ -23,7 +23,7 @@ CF_DECLS
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CF_KEYWORDS(BFD, MIN, IDLE, RX, TX, INTERVAL, MULTIPLIER, PASSIVE,
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INTERFACE, MULTIHOP, NEIGHBOR, DEV, LOCAL, AUTHENTICATION,
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NONE, SIMPLE, METICULOUS, KEYED, MD5, SHA1)
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NONE, SIMPLE, METICULOUS, KEYED, MD5, SHA1, IPV4, IPV6, DIRECT)
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%type <iface> bfd_neigh_iface
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%type <a> bfd_neigh_local
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@ -38,10 +38,13 @@ bfd_proto_start: proto_start BFD
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this_proto = proto_config_new(&proto_bfd, $1);
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init_list(&BFD_CFG->patt_list);
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init_list(&BFD_CFG->neigh_list);
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BFD_CFG->accept_ipv4 = BFD_CFG->accept_ipv6 = 1;
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BFD_CFG->accept_direct = BFD_CFG->accept_multihop = 1;
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};
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bfd_proto_item:
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proto_item
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| ACCEPT bfd_accept
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| INTERFACE bfd_iface
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| MULTIHOP bfd_multihop
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| NEIGHBOR bfd_neighbor
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@ -56,6 +59,21 @@ bfd_proto:
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bfd_proto_start proto_name '{' bfd_proto_opts '}';
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bfd_accept_item:
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IPV4 { BFD_CFG->accept_ipv4 = 1; BFD_CFG->accept_ipv6 = 0; }
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| IPV6 { BFD_CFG->accept_ipv4 = 0; BFD_CFG->accept_ipv6 = 1; }
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| DIRECT { BFD_CFG->accept_direct = 1; BFD_CFG->accept_multihop = 0; }
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| MULTIHOP { BFD_CFG->accept_direct = 0; BFD_CFG->accept_multihop = 1; }
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;
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bfd_accept:
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{
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BFD_CFG->accept_ipv4 = BFD_CFG->accept_ipv6 = 1;
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BFD_CFG->accept_direct = BFD_CFG->accept_multihop = 1;
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}
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| bfd_accept bfd_accept_item
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bfd_iface_start:
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{
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this_ipatt = cfg_allocz(sizeof(struct bfd_iface_config));
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