mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 17:51:53 +00:00
BGP now has its own loop
This commit is contained in:
Maria Matejka
parent
836e857b30
commit
e33902e15c
125
proto/bgp/bgp.c
125
proto/bgp/bgp.c
@ -126,13 +126,13 @@
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#include "bgp.h"
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static void bgp_listen_create(void *);
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static list STATIC_LIST_INIT(bgp_sockets); /* Global list of listening sockets */
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static list STATIC_LIST_INIT(bgp_listen_pending); /* Global list of listening socket open requests */
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static event bgp_listen_event = { .hook = bgp_listen_create };
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DOMAIN(rtable) bgp_listen_domain;
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static void bgp_connect(struct bgp_proto *p);
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static void bgp_active(struct bgp_proto *p);
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@ -151,6 +151,13 @@ static void bgp_graceful_restart_feed(struct bgp_channel *c);
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static inline int
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bgp_setup_auth(struct bgp_proto *p, int enable)
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{
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/* Beware. This is done from main_birdloop and protocol birdloop is NOT ENTERED.
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* Anyway, we are only accessing:
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* - protocol config which can be changed only from main_birdloop (reconfig)
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* - protocol listen socket which is always driven by main_birdloop
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* - protocol name which is set on reconfig
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*/
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if (p->cf->password && p->listen.sock)
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{
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ip_addr prefix = p->cf->remote_ip;
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@ -184,16 +191,21 @@ bgp_setup_auth(struct bgp_proto *p, int enable)
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static void
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bgp_close(struct bgp_proto *p)
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{
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LOCK_DOMAIN(rtable, bgp_listen_domain);
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struct bgp_listen_request *req = &p->listen;
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struct bgp_socket *bs = req->sock;
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ASSERT(bs);
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if (bs)
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{
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req->sock = NULL;
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rem_node(&req->n);
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if (EMPTY_LIST(bs->requests))
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ev_schedule(&bgp_listen_event);
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if (bs && EMPTY_LIST(bs->requests))
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ev_send(&global_event_list, &bgp_listen_event);
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}
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UNLOCK_DOMAIN(rtable, bgp_listen_domain);
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}
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/**
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@ -208,6 +220,8 @@ bgp_close(struct bgp_proto *p)
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static void
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bgp_open(struct bgp_proto *p)
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{
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LOCK_DOMAIN(rtable, bgp_listen_domain);
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struct bgp_listen_request *req = &p->listen;
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/* We assume that cf->iface is defined iff cf->local_ip is link-local */
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req->iface = p->cf->strict_bind ? p->cf->iface : NULL;
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@ -220,17 +234,28 @@ bgp_open(struct bgp_proto *p)
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BGP_TRACE(D_EVENTS, "Requesting listen socket at %I%J port %u", req->addr, req->iface, req->port);
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add_tail(&bgp_listen_pending, &req->n);
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ev_schedule(&bgp_listen_event);
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ev_send(&global_event_list, &bgp_listen_event);
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UNLOCK_DOMAIN(rtable, bgp_listen_domain);
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}
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static void
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bgp_listen_create(void *_ UNUSED)
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{
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ASSERT_DIE(birdloop_inside(&main_birdloop));
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uint flag_mask = SKF_FREEBIND;
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struct bgp_listen_request *req;
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WALK_LIST_FIRST(req, bgp_listen_pending)
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while (1) {
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LOCK_DOMAIN(rtable, bgp_listen_domain);
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if (EMPTY_LIST(bgp_listen_pending))
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{
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UNLOCK_DOMAIN(rtable, bgp_listen_domain);
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break;
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}
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/* Get the first request to match */
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struct bgp_listen_request *req = HEAD(bgp_listen_pending);
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struct bgp_proto *p = SKIP_BACK(struct bgp_proto, listen, req);
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rem_node(&req->n);
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@ -249,6 +274,8 @@ bgp_listen_create(void *_ UNUSED)
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BGP_TRACE(D_EVENTS, "Found a listening socket: %p", bs);
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else
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{
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/* Allocating new socket from global protocol pool.
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* We can do this in main_birdloop. */
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sock *sk = sk_new(proto_pool);
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sk->type = SK_TCP_PASSIVE;
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sk->ttl = 255;
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@ -268,8 +295,9 @@ bgp_listen_create(void *_ UNUSED)
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sk_log_error(sk, p->p.name);
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log(L_ERR "%s: Cannot open listening socket", p->p.name);
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rfree(sk);
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bgp_initiate_disable(p, BEM_NO_SOCKET);
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UNLOCK_DOMAIN(rtable, bgp_listen_domain);
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bgp_initiate_disable(p, BEM_NO_SOCKET);
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continue;
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}
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@ -283,17 +311,25 @@ bgp_listen_create(void *_ UNUSED)
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BGP_TRACE(D_EVENTS, "Created new listening socket: %p", bs);
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}
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add_tail(&bs->requests, &req->n);
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req->sock = bs;
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add_tail(&bs->requests, &req->n);
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if (bgp_setup_auth(p, 1) < 0)
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{
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bgp_close(p);
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rem_node(&req->n);
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req->sock = NULL;
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UNLOCK_DOMAIN(rtable, bgp_listen_domain);
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bgp_initiate_disable(p, BEM_INVALID_MD5);
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continue;
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}
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UNLOCK_DOMAIN(rtable, bgp_listen_domain);
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}
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/* Cleanup leftover listening sockets */
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LOCK_DOMAIN(rtable, bgp_listen_domain);
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struct bgp_socket *bs;
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node *nxt;
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WALK_LIST_DELSAFE(bs, nxt, bgp_sockets)
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@ -303,6 +339,7 @@ bgp_listen_create(void *_ UNUSED)
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rem_node(&bs->n);
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mb_free(bs);
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}
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UNLOCK_DOMAIN(rtable, bgp_listen_domain);
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}
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static inline struct bgp_channel *
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@ -328,6 +365,9 @@ bgp_startup(struct bgp_proto *p)
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if (p->postponed_sk)
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{
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/* Apply postponed incoming connection */
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sk_unmain(p->postponed_sk);
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sk_start(p->postponed_sk);
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bgp_setup_conn(p, &p->incoming_conn);
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bgp_setup_sk(&p->incoming_conn, p->postponed_sk);
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bgp_send_open(&p->incoming_conn);
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@ -354,7 +394,7 @@ bgp_initiate(struct bgp_proto *p)
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{
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p->start_state = BSS_DELAY;
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BGP_TRACE(D_EVENTS, "Startup delayed by %d seconds due to errors", p->startup_delay);
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bgp_start_timer(p->startup_timer, p->startup_delay);
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bgp_start_timer(p, p->startup_timer, p->startup_delay);
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}
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else
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bgp_startup(p);
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@ -363,13 +403,19 @@ bgp_initiate(struct bgp_proto *p)
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static void
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bgp_initiate_disable(struct bgp_proto *p, int err_val)
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{
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PROTO_LOCKED_FROM_MAIN(&p->p)
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{
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/* The protocol may be already down for another reason.
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* Shutdown the protocol only if it isn't already shutting down. */
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switch (p->p.proto_state)
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{
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case PS_START:
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case PS_UP:
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p->p.disabled = 1;
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bgp_store_error(p, NULL, BE_MISC, err_val);
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p->neigh = NULL;
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proto_notify_state(&p->p, PS_DOWN);
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return;
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bgp_stop(p, err_val, NULL, 0);
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}
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}
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}
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/**
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@ -382,14 +428,14 @@ bgp_initiate_disable(struct bgp_proto *p, int err_val)
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* timers.
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*/
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void
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bgp_start_timer(timer *t, uint value)
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bgp_start_timer(struct bgp_proto *p, timer *t, uint value)
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{
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if (value)
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{
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/* The randomization procedure is specified in RFC 4271 section 10 */
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btime time = value S;
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btime randomize = random() % ((time / 4) + 1);
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tm_start(t, time - randomize);
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tm_start_in(t, time - randomize, p->p.loop);
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}
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else
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tm_stop(t);
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@ -419,6 +465,7 @@ bgp_close_conn(struct bgp_conn *conn)
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rfree(conn->tx_ev);
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conn->tx_ev = NULL;
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rfree(conn->sk);
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conn->sk = NULL;
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@ -564,7 +611,7 @@ bgp_stop(struct bgp_proto *p, int subcode, byte *data, uint len)
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if (c->ptx)
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bgp_free_pending_tx(c);
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ev_schedule(p->event);
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proto_send_event(&p->p, p->event);
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}
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static inline void
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@ -755,7 +802,7 @@ bgp_conn_enter_close_state(struct bgp_conn *conn)
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conn->sk->rx_hook = NULL;
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/* Timeout for CLOSE state, if we cannot send notification soon then we just hangup */
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bgp_start_timer(conn->hold_timer, 10);
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bgp_start_timer(p, conn->hold_timer, 10);
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if (os == BS_ESTABLISHED)
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bgp_conn_leave_established_state(p);
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@ -769,7 +816,7 @@ bgp_conn_enter_idle_state(struct bgp_conn *conn)
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bgp_close_conn(conn);
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bgp_conn_set_state(conn, BS_IDLE);
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ev_schedule(p->event);
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proto_send_event(&p->p, p->event);
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if (os == BS_ESTABLISHED)
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bgp_conn_leave_established_state(p);
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@ -840,7 +887,7 @@ bgp_handle_graceful_restart(struct bgp_proto *p)
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ASSERT(p->gr_active_num > 0);
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proto_notify_state(&p->p, PS_START);
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tm_start(p->gr_timer, p->conn->remote_caps->gr_time S);
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tm_start_in(p->gr_timer, p->conn->remote_caps->gr_time S, p->p.loop);
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}
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static void
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@ -954,7 +1001,7 @@ bgp_graceful_restart_timeout(timer *t)
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/* Channel is in GR, and supports LLGR -> start LLGR */
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c->gr_active = BGP_GRS_LLGR;
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tm_start(c->stale_timer, c->stale_time S);
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tm_start_in(c->stale_timer, c->stale_time S, p->p.loop);
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bgp_graceful_restart_feed(c);
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}
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}
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@ -1028,7 +1075,7 @@ bgp_send_open(struct bgp_conn *conn)
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bgp_prepare_capabilities(conn);
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bgp_schedule_packet(conn, NULL, PKT_OPEN);
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bgp_conn_set_state(conn, BS_OPENSENT);
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bgp_start_timer(conn->hold_timer, conn->bgp->cf->initial_hold_time);
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bgp_start_timer(conn->bgp, conn->hold_timer, conn->bgp->cf->initial_hold_time);
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}
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static void
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@ -1105,7 +1152,7 @@ bgp_hold_timeout(timer *t)
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and perhaps just not processed BGP packets in time. */
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if (sk_rx_ready(conn->sk) > 0)
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bgp_start_timer(conn->hold_timer, 10);
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bgp_start_timer(p, conn->hold_timer, 10);
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else if ((conn->state == BS_ESTABLISHED) && p->llgr_ready)
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{
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BGP_TRACE(D_EVENTS, "Hold timer expired");
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@ -1165,7 +1212,7 @@ bgp_active(struct bgp_proto *p)
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BGP_TRACE(D_EVENTS, "Connect delayed by %d seconds", delay);
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bgp_setup_conn(p, conn);
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bgp_conn_set_state(conn, BS_ACTIVE);
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bgp_start_timer(conn->connect_timer, delay);
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bgp_start_timer(p, conn->connect_timer, delay);
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}
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/**
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@ -1196,6 +1243,7 @@ bgp_connect(struct bgp_proto *p) /* Enter Connect state and start establishing c
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s->tos = IP_PREC_INTERNET_CONTROL;
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s->password = p->cf->password;
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s->tx_hook = bgp_connected;
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s->flags = SKF_THREAD;
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BGP_TRACE(D_EVENTS, "Connecting to %I%J from local address %I%J",
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s->daddr, ipa_is_link_local(s->daddr) ? p->cf->iface : NULL,
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s->saddr, ipa_is_link_local(s->saddr) ? s->iface : NULL);
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@ -1212,7 +1260,7 @@ bgp_connect(struct bgp_proto *p) /* Enter Connect state and start establishing c
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goto err;
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DBG("BGP: Waiting for connect success\n");
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bgp_start_timer(conn->connect_timer, p->cf->connect_retry_time);
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bgp_start_timer(p, conn->connect_timer, p->cf->connect_retry_time);
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return;
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err:
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@ -1239,6 +1287,8 @@ bgp_find_proto(sock *sk)
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/* sk->iface is valid only if src or dst address is link-local */
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int link = ipa_is_link_local(sk->saddr) || ipa_is_link_local(sk->daddr);
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LOCK_DOMAIN(rtable, bgp_listen_domain);
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WALK_LIST(req, bs->requests)
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{
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struct bgp_proto *p = SKIP_BACK(struct bgp_proto, listen, req);
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@ -1257,6 +1307,7 @@ bgp_find_proto(sock *sk)
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}
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}
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UNLOCK_DOMAIN(rtable, bgp_listen_domain);
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return best;
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}
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@ -1275,6 +1326,8 @@ bgp_find_proto(sock *sk)
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static int
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bgp_incoming_connection(sock *sk, uint dummy UNUSED)
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{
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ASSERT_DIE(birdloop_inside(&main_birdloop));
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struct bgp_proto *p;
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int acc, hops;
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@ -1288,6 +1341,8 @@ bgp_incoming_connection(sock *sk, uint dummy UNUSED)
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return 0;
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}
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birdloop_enter(p->p.loop);
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/*
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* BIRD should keep multiple incoming connections in OpenSent state (for
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* details RFC 4271 8.2.1 par 3), but it keeps just one. Duplicate incoming
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@ -1317,7 +1372,7 @@ bgp_incoming_connection(sock *sk, uint dummy UNUSED)
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if (!acc)
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{
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rfree(sk);
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return 0;
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goto leave;
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}
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hops = p->cf->multihop ? : 1;
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@ -1342,19 +1397,24 @@ bgp_incoming_connection(sock *sk, uint dummy UNUSED)
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p = bgp_spawn(p, sk->daddr);
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p->postponed_sk = sk;
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rmove(sk, p->p.pool);
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return 0;
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goto leave;
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}
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rmove(sk, p->p.pool);
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sk_reloop(sk, p->p.loop);
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bgp_setup_conn(p, &p->incoming_conn);
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bgp_setup_sk(&p->incoming_conn, sk);
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bgp_send_open(&p->incoming_conn);
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return 0;
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goto leave;
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err:
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sk_log_error(sk, p->p.name);
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log(L_ERR "%s: Incoming connection aborted", p->p.name);
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rfree(sk);
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leave:
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birdloop_leave(p->p.loop);
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return 0;
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}
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@ -1679,7 +1739,7 @@ bgp_start(struct proto *P)
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.hook = bgp_start_locked,
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.data = p,
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};
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lock->target = &global_event_list;
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lock->target = proto_event_list(P);
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/* For dynamic BGP, we use inst 1 to avoid collisions with regular BGP */
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if (bgp_is_dynamic(p))
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@ -2776,4 +2836,5 @@ void bgp_build(void)
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{
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proto_build(&proto_bgp);
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bgp_register_attrs();
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bgp_listen_domain = DOMAIN_NEW(rtable, "BGP Listen Sockets");
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}
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@ -547,7 +547,7 @@ bgp_parse_error(struct bgp_parse_state *s, uint subcode)
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}
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void bgp_start_timer(timer *t, uint value);
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void bgp_start_timer(struct bgp_proto *p, timer *t, uint value);
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void bgp_check_config(struct bgp_config *c);
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void bgp_error(struct bgp_conn *c, unsigned code, unsigned subcode, byte *data, int len);
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void bgp_close_conn(struct bgp_conn *c);
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@ -52,6 +52,7 @@ proto: bgp_proto '}' ;
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bgp_proto_start: proto_start BGP {
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this_proto = proto_config_new(&proto_bgp, $1);
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this_proto->loop_order = DOMAIN_ORDER(proto);
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BGP_CFG->local_port = BGP_PORT;
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BGP_CFG->remote_port = BGP_PORT;
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BGP_CFG->multihop = -1; /* undefined */
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@ -973,7 +973,7 @@ bgp_rx_open(struct bgp_conn *conn, byte *pkt, uint len)
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conn->hold_time, conn->keepalive_time, p->remote_as, p->remote_id, conn->as4_session);
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bgp_schedule_packet(conn, NULL, PKT_KEEPALIVE);
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bgp_start_timer(conn->hold_timer, conn->hold_time);
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bgp_start_timer(p, conn->hold_timer, conn->hold_time);
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bgp_conn_enter_openconfirm_state(conn);
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}
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@ -2572,7 +2572,7 @@ bgp_rx_update(struct bgp_conn *conn, byte *pkt, uint len)
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if (conn->state != BS_ESTABLISHED)
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{ bgp_error(conn, 5, fsm_err_subcode[conn->state], NULL, 0); return; }
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|
||||
bgp_start_timer(conn->hold_timer, conn->hold_time);
|
||||
bgp_start_timer(p, conn->hold_timer, conn->hold_time);
|
||||
|
||||
struct lp_state tmpp;
|
||||
lp_save(tmp_linpool, &tmpp);
|
||||
@ -2913,7 +2913,7 @@ bgp_fire_tx(struct bgp_conn *conn)
|
||||
{
|
||||
conn->packets_to_send &= ~(1 << PKT_KEEPALIVE);
|
||||
BGP_TRACE(D_PACKETS, "Sending KEEPALIVE");
|
||||
bgp_start_timer(conn->keepalive_timer, conn->keepalive_time);
|
||||
bgp_start_timer(p, conn->keepalive_timer, conn->keepalive_time);
|
||||
return bgp_send(conn, PKT_KEEPALIVE, BGP_HEADER_LENGTH);
|
||||
}
|
||||
else while (conn->channels_to_send)
|
||||
@ -3002,7 +3002,7 @@ bgp_schedule_packet(struct bgp_conn *conn, struct bgp_channel *c, int type)
|
||||
conn->packets_to_send |= 1 << type;
|
||||
|
||||
if ((conn->sk->tpos == conn->sk->tbuf) && !ev_active(conn->tx_ev))
|
||||
ev_schedule(conn->tx_ev);
|
||||
proto_send_event(&p->p, conn->tx_ev);
|
||||
}
|
||||
void
|
||||
bgp_kick_tx(void *vconn)
|
||||
@ -3219,7 +3219,7 @@ bgp_rx_keepalive(struct bgp_conn *conn)
|
||||
struct bgp_proto *p = conn->bgp;
|
||||
|
||||
BGP_TRACE(D_PACKETS, "Got KEEPALIVE");
|
||||
bgp_start_timer(conn->hold_timer, conn->hold_time);
|
||||
bgp_start_timer(p, conn->hold_timer, conn->hold_time);
|
||||
|
||||
if (conn->state == BS_OPENCONFIRM)
|
||||
{ bgp_conn_enter_established_state(conn); return; }
|
||||
|
||||
Loading…
Reference in New Issue
Block a user