diff options
Diffstat (limited to 'proto/bgp')
| -rw-r--r-- | proto/bgp/bgp.c | 48 | ||||
| -rw-r--r-- | proto/bgp/bgp.h | 5 | ||||
| -rw-r--r-- | proto/bgp/config.Y | 3 |
3 files changed, 53 insertions, 3 deletions
diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c index 7cad75df..07ad31f3 100644 --- a/proto/bgp/bgp.c +++ b/proto/bgp/bgp.c @@ -59,8 +59,9 @@ #include "nest/iface.h" #include "nest/protocol.h" #include "nest/route.h" -#include "nest/locks.h" +#include "nest/bfd.h" #include "nest/cli.h" +#include "nest/locks.h" #include "conf/conf.h" #include "lib/socket.h" #include "lib/resource.h" @@ -76,6 +77,7 @@ static void bgp_close(struct bgp_proto *p, int apply_md5); static void bgp_connect(struct bgp_proto *p); static void bgp_active(struct bgp_proto *p); static sock *bgp_setup_listen_sk(ip_addr addr, unsigned port, u32 flags); +static void bgp_update_bfd(struct bgp_proto *p, int use_bfd); /** @@ -153,8 +155,12 @@ bgp_initiate(struct bgp_proto *p) if (rv < 0) return; + if (p->cf->bfd) + bgp_update_bfd(p, p->cf->bfd); + if (p->startup_delay) { + p->start_state = BSS_DELAY; BGP_TRACE(D_EVENTS, "Startup delayed by %d seconds", p->startup_delay); bgp_start_timer(p->startup_timer, p->startup_delay); } @@ -765,6 +771,37 @@ bgp_neigh_notify(neighbor *n) } } +static void +bgp_bfd_notify(struct bfd_request *req) +{ + struct bgp_proto *p = req->data; + int ps = p->p.proto_state; + + if (req->down && ((ps == PS_START) || (ps == PS_UP))) + { + BGP_TRACE(D_EVENTS, "BFD session down"); + bgp_store_error(p, NULL, BE_MISC, BEM_BFD_DOWN); + if (ps == PS_UP) + bgp_update_startup_delay(p); + bgp_stop(p, 0); + } +} + +static void +bgp_update_bfd(struct bgp_proto *p, int use_bfd) +{ + if (use_bfd && !p->bfd_req) + p->bfd_req = bfd_request_session(p->p.pool, p->cf->remote_ip, p->source_addr, + p->cf->multihop ? NULL : p->neigh->iface, + bgp_bfd_notify, p); + + if (!use_bfd && p->bfd_req) + { + rfree(p->bfd_req); + p->bfd_req = NULL; + } +} + static int bgp_reload_routes(struct proto *P) { @@ -825,6 +862,7 @@ bgp_start(struct proto *P) p->outgoing_conn.state = BS_IDLE; p->incoming_conn.state = BS_IDLE; p->neigh = NULL; + p->bfd_req = NULL; rt_lock_table(p->igp_table); @@ -992,6 +1030,9 @@ bgp_check_config(struct bgp_config *c) ipa_has_link_scope(c->source_addr))) cf_error("Multihop BGP cannot be used with link-local addresses"); + if (c->multihop && c->bfd && ipa_zero(c->source_addr)) + cf_error("Multihop BGP with BFD requires specified source address"); + /* Different default based on rs_client */ if (!c->missing_lladdr) @@ -1034,6 +1075,9 @@ bgp_reconfigure(struct proto *P, struct proto_config *C) || (old->password && new->password && !strcmp(old->password, new->password))) && (get_igp_table(old) == get_igp_table(new)); + if (same && (p->start_state > BSS_PREPARE)) + bgp_update_bfd(p, new->bfd); + /* We should update our copy of configuration ptr as old configuration will be freed */ if (same) p->cf = new; @@ -1115,7 +1159,7 @@ bgp_store_error(struct bgp_proto *p, struct bgp_conn *c, u8 class, u32 code) static char *bgp_state_names[] = { "Idle", "Connect", "Active", "OpenSent", "OpenConfirm", "Established", "Close" }; static char *bgp_err_classes[] = { "", "Error: ", "Socket: ", "Received: ", "BGP Error: ", "Automatic shutdown: ", ""}; -static char *bgp_misc_errors[] = { "", "Neighbor lost", "Invalid next hop", "Kernel MD5 auth failed", "No listening socket" }; +static char *bgp_misc_errors[] = { "", "Neighbor lost", "Invalid next hop", "Kernel MD5 auth failed", "No listening socket", "BFD session down" }; static char *bgp_auto_errors[] = { "", "Route limit exceeded"}; static const char * diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h index bcbdf2cc..d2a96bbb 100644 --- a/proto/bgp/bgp.h +++ b/proto/bgp/bgp.h @@ -14,6 +14,7 @@ struct linpool; struct eattr; +struct bfd_request; struct bgp_config { struct proto_config c; @@ -53,8 +54,10 @@ struct bgp_config { unsigned error_delay_time_min; /* Time to wait after an error is detected */ unsigned error_delay_time_max; unsigned disable_after_error; /* Disable the protocol when error is detected */ + char *password; /* Password used for MD5 authentication */ struct rtable_config *igp_table; /* Table used for recursive next hop lookups */ + int bfd; /* Use BFD for liveness detection */ }; #define MLL_SELF 1 @@ -100,6 +103,7 @@ struct bgp_proto { struct bgp_conn incoming_conn; /* Incoming connection we have neither accepted nor rejected yet */ struct object_lock *lock; /* Lock for neighbor connection */ struct neighbor *neigh; /* Neighbor entry corresponding to remote ip, NULL if multihop */ + struct bfd_request *bfd_req; /* BFD request, if BFD is used */ ip_addr source_addr; /* Local address used as an advertised next hop */ rtable *igp_table; /* Table used for recursive next hop lookups */ struct event *event; /* Event for respawning and shutting process */ @@ -288,6 +292,7 @@ void bgp_log_error(struct bgp_proto *p, u8 class, char *msg, unsigned code, unsi #define BEM_INVALID_NEXT_HOP 2 #define BEM_INVALID_MD5 3 /* MD5 authentication kernel request failed (possibly not supported) */ #define BEM_NO_SOCKET 4 +#define BEM_BFD_DOWN 5 /* Automatic shutdown error codes */ diff --git a/proto/bgp/config.Y b/proto/bgp/config.Y index f4b2c5fe..185b1bda 100644 --- a/proto/bgp/config.Y +++ b/proto/bgp/config.Y @@ -26,7 +26,7 @@ CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY, PREFER, OLDER, MISSING, LLADDR, DROP, IGNORE, ROUTE, REFRESH, INTERPRET, COMMUNITIES, BGP_ORIGINATOR_ID, BGP_CLUSTER_LIST, IGP, TABLE, GATEWAY, DIRECT, RECURSIVE, MED, TTL, SECURITY, DETERMINISTIC, - SECONDARY, ALLOW) + SECONDARY, ALLOW, BFD) CF_GRAMMAR @@ -112,6 +112,7 @@ bgp_proto: | bgp_proto ALLOW LOCAL AS expr ';' { BGP_CFG->allow_local_as = $5; } | bgp_proto IGP TABLE rtable ';' { BGP_CFG->igp_table = $4; } | bgp_proto TTL SECURITY bool ';' { BGP_CFG->ttl_security = $4; } + | bgp_proto BFD bool ';' { BGP_CFG->bfd = $3; cf_check_bfd($3); } ; CF_ADDTO(dynamic_attr, BGP_ORIGIN |