Started work on BGP. Wrote main part of the connection handling code.
This commit is contained in:
Martin Mares
parent
1cf716f075
commit
c01e37416d
7 changed files with 370 additions and 8 deletions
2
TODO
2
TODO
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@ -9,6 +9,8 @@ Core
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- tagging of external routes?
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- when an identical route is received, don't trigger updates
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Commands
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~~~~~~~~
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- showing of routing table as seen by given protocol
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@ -1,4 +1,4 @@
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source=bgp.c
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source=bgp.c attrs.c
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root-rel=../../
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dir-name=proto/bgp
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15
proto/bgp/attrs.c
Normal file
15
proto/bgp/attrs.c
Normal file
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@ -0,0 +1,15 @@
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/*
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* BIRD -- BGP Attributes
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*
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* (c) 2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "nest/bird.h"
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#include "nest/iface.h"
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#include "nest/protocol.h"
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#include "nest/route.h"
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#include "conf/conf.h"
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#include "bgp.h"
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260
proto/bgp/bgp.c
260
proto/bgp/bgp.c
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@ -12,10 +12,20 @@
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#include "nest/iface.h"
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#include "nest/protocol.h"
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#include "nest/route.h"
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#include "nest/locks.h"
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#include "conf/conf.h"
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#include "lib/socket.h"
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#include "bgp.h"
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static sock *bgp_listen_sk; /* Global listening socket */
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static int bgp_counter; /* Number of protocol instances using the listening socket */
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static list bgp_list; /* List of active BGP instances */
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static void bgp_close_conn(struct bgp_conn *conn);
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static void bgp_connect(struct bgp_proto *p);
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static void bgp_setup_sk(struct bgp_proto *p, struct bgp_conn *conn, sock *s);
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static void
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bgp_rt_notify(struct proto *P, net *n, rte *new, rte *old, ea_list *tmpa)
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{
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@ -29,18 +39,266 @@ bgp_init(struct proto_config *C)
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struct bgp_proto *p = (struct bgp_proto *) P;
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P->rt_notify = bgp_rt_notify;
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p->cf = c;
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p->local_as = c->local_as;
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p->remote_as = c->remote_as;
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p->is_internal = (c->local_as == c->remote_as);
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p->conn.state = BS_IDLE;
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p->incoming_conn.state = BS_IDLE;
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p->local_id = C->global->router_id;
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return P;
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}
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static void
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bgp_close(struct bgp_proto *p)
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{
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rem_node(&p->bgp_node);
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ASSERT(bgp_counter);
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bgp_counter--;
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if (!bgp_counter)
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{
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rfree(bgp_listen_sk);
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bgp_listen_sk = NULL;
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}
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/* FIXME: Automatic restart after errors? */
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}
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static void
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bgp_reset(struct bgp_proto *p)
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{
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bgp_close(p);
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proto_notify_state(&p->p, PS_DOWN);
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}
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static void
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bgp_start_timer(timer *t, int value)
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{
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/* FIXME: Randomize properly */
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/* FIXME: Check if anybody uses tm_start directly */
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tm_start(t, value);
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}
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static int
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bgp_rx(sock *sk, int size)
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{
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DBG("BGP: Got %d bytes\n", size);
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return 1; /* Start from the beginning */
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}
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static void
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bgp_send_open(struct bgp_conn *conn)
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{
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DBG("BGP: Sending open\n");
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conn->sk->rx_hook = bgp_rx;
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tm_stop(conn->connect_retry_timer);
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/* FIXME */
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conn->state = BS_OPENSENT;
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}
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static int
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bgp_connected(sock *sk, int dummy)
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{
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struct bgp_conn *conn = sk->data;
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DBG("BGP: Connected\n");
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bgp_send_open(conn);
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return 0;
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}
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static void
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bgp_connect_timeout(timer *t)
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{
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struct bgp_proto *p = t->data;
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struct bgp_conn *conn = &p->conn;
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DBG("BGP: Connect timeout, retrying\n");
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bgp_close_conn(conn);
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bgp_connect(p);
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}
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static void
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bgp_err(sock *sk, int err)
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{
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struct bgp_conn *conn = sk->data;
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DBG("BGP: Socket error %d in state %d\n", err, conn->state);
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sk->type = SK_DELETED; /* FIXME: Need to do this always! */
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switch (conn->state)
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{
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case BS_CONNECT:
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case BS_OPENSENT:
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conn->state = BS_ACTIVE;
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bgp_start_timer(conn->connect_retry_timer, conn->bgp->cf->connect_retry_time);
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break;
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case BS_OPENCONFIRM:
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case BS_ESTABLISHED:
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/* FIXME: Should close the connection and go to Idle state */
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default:
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bug("bgp_err called in invalid state %d", conn->state);
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}
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}
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static int
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bgp_incoming_connection(sock *sk, int dummy)
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{
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node *n;
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DBG("BGP: Incoming connection from %I port %d\n", sk->daddr, sk->dport);
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WALK_LIST(n, bgp_list)
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{
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struct bgp_proto *p = SKIP_BACK(struct bgp_proto, bgp_node, n);
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if (ipa_equal(p->cf->remote_ip, sk->daddr) && sk->dport == BGP_PORT)
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{
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DBG("BGP: Authorized\n");
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if (p->incoming_conn.sk)
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{
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DBG("BGP: But one incoming connection already exists, how is that possible?\n");
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break;
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}
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bgp_setup_sk(p, &p->incoming_conn, sk);
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bgp_send_open(&p->incoming_conn);
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return 0;
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}
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}
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DBG("BGP: Unauthorized\n");
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rfree(sk);
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return 0;
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}
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static void
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bgp_setup_sk(struct bgp_proto *p, struct bgp_conn *conn, sock *s)
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{
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timer *t;
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s->data = conn;
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s->ttl = p->cf->multihop ? : 1;
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s->rbsize = BGP_RX_BUFFER_SIZE;
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#if 0
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s->tx_hook = bgp_tx;
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#endif
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s->err_hook = bgp_err;
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s->tos = IP_PREC_INTERNET_CONTROL;
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conn->bgp = p;
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conn->sk = s;
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t = conn->connect_retry_timer = tm_new(p->p.pool);
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t->hook = bgp_connect_timeout;
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t->data = p;
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#if 0
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t = p->hold_timer = tm_new(p->p.pool);
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t->hook = bgp_hold_timeout;
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t->data = p;
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t = p->keepalive_timer = tm_new(p->p.pool);
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t->hook = bgp_keepalive_timeout;
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t->data = p;
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#endif
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}
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static void
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bgp_close_conn(struct bgp_conn *conn)
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{
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rfree(conn->connect_retry_timer);
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conn->connect_retry_timer = NULL;
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rfree(conn->keepalive_timer);
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conn->keepalive_timer = NULL;
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rfree(conn->hold_timer);
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conn->hold_timer = NULL;
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rfree(conn->sk);
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conn->sk = NULL;
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conn->state = BS_IDLE;
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}
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static void
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bgp_connect(struct bgp_proto *p) /* Enter Connect state and start establishing connection */
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{
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sock *s;
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struct bgp_conn *conn = &p->conn;
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DBG("BGP: Connecting\n");
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s = sk_new(p->p.pool);
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s->type = SK_TCP_ACTIVE;
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s->saddr = _MI(0x3ea80001); /* FIXME: Hack */
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s->daddr = p->cf->remote_ip;
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#if 0
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s->sport = /* FIXME */
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#endif
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s->dport = BGP_PORT;
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s->rx_hook = bgp_connected;
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bgp_setup_sk(p, conn, s);
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conn->state = BS_CONNECT;
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if (sk_open(s))
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{
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bgp_err(s, 0);
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return;
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}
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DBG("BGP: Waiting for connect success\n");
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bgp_start_timer(conn->connect_retry_timer, p->cf->connect_retry_time);
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}
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static void
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bgp_start_locked(struct object_lock *lock)
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{
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struct bgp_proto *p = lock->data;
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DBG("BGP: Got lock\n");
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if (!bgp_counter++)
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init_list(&bgp_list);
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if (!bgp_listen_sk)
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{
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sock *s = sk_new(&root_pool);
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DBG("BGP: Creating incoming socket\n");
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s->type = SK_TCP_PASSIVE;
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s->sport = BGP_PORT;
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s->tos = IP_PREC_INTERNET_CONTROL;
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s->ttl = 1;
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s->rbsize = BGP_RX_BUFFER_SIZE;
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s->rx_hook = bgp_incoming_connection;
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if (sk_open(s))
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{
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log(L_ERR "Unable to open incoming BGP socket");
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rfree(s);
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}
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else
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bgp_listen_sk = s;
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}
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add_tail(&bgp_list, &p->bgp_node);
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bgp_connect(p); /* FIXME: Use neighbor cache for fast up/down transitions? */
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}
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static int
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bgp_start(struct proto *P)
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{
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return PS_UP;
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struct bgp_proto *p = (struct bgp_proto *) P;
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struct object_lock *lock;
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/*
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* Before attempting to create the connection, we need to lock the
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* port, so that are sure we're the only instance attempting to talk
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* with that neighbor.
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*/
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DBG("BGP: Startup. Acquiring lock.\n");
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lock = p->lock = olock_new(P->pool);
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lock->addr = p->cf->remote_ip;
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lock->type = OBJLOCK_TCP;
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lock->port = BGP_PORT;
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lock->iface = NULL;
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lock->hook = bgp_start_locked;
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lock->data = p;
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olock_acquire(lock);
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return PS_START;
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}
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static int
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bgp_shutdown(struct proto *P)
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{
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struct bgp_proto *p = (struct bgp_proto *) P;
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DBG("BGP: Explicit shutdown\n");
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bgp_close(p);
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return PS_DOWN;
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}
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@ -14,18 +14,82 @@ struct bgp_config {
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unsigned int local_as, remote_as;
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ip_addr remote_ip;
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int multihop; /* Number of hops if multihop */
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int connect_retry_time;
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int hold_time;
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int keepalive_time;
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};
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struct bgp_conn {
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struct bgp_proto *bgp;
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struct birdsock *sk;
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int state; /* State of connection state machine */
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struct timer *connect_retry_timer;
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struct timer *hold_timer;
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struct timer *keepalive_timer;
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};
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struct bgp_proto {
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struct proto p;
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struct bgp_config *cf; /* Shortcut to BGP configuration */
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node bgp_node; /* Node in global BGP protocol list */
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int local_as, remote_as;
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int is_internal; /* Internal BGP connection (local_as == remote_as) */
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u32 local_id; /* BGP identifier of this router */
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u32 remote_id; /* BGP identifier of the neighbor */
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int hold_time; /* Hold time calculated from my and neighbor's requirements */
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struct bgp_conn conn; /* Our primary connection */
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struct bgp_conn incoming_conn; /* Incoming connection we have neither accepted nor rejected yet */
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struct object_lock *lock; /* Lock for neighbor connection */
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};
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struct bgp_route {
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};
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struct bgp_attrs {
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};
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#define BGP_PORT 179
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#define BGP_RX_BUFFER_SIZE 4096
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void bgp_check(struct bgp_config *c);
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/* attrs.c */
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/* packets.c */
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/* Packet types */
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#define PKT_OPEN 0x01
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#define PKT_UPDATE 0x02
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#define PKT_NOTIFICATION 0x03
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#define PKT_KEEPALIVE 0x04
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/* Attributes */
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#define BAF_OPTIONAL 0x80
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#define BAF_TRANSITIVE 0x40
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#define BAF_PARTIAL 0x20
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#define BAF_EXT_LEN 0x10
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#define BA_ORIGIN 0x01 /* [RFC1771] */ /* WM */
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#define BA_AS_PATH 0x02 /* WM */
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#define BA_NEXT_HOP 0x03 /* WM */
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#define BA_MULTI_EXIT_DISC 0x04 /* ON */
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#define BA_LOCAL_PREF 0x05 /* WM */
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#define BA_ATOMIC_AGGR 0x06 /* WD */
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#define BA_AGGREGATOR 0x07 /* OT */
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#define BA_COMMUNITY 0x08 /* [RFC1997] */ /* OT */
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#define BA_ORIGINATOR_ID 0x09 /* [RFC1966] */ /* ON */
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#define BA_CLUSTER_LIST 0x0a /* ON */
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/* We don't support these: */
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#define BA_DPA 0x0b /* ??? */
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#define BA_ADVERTISER 0x0c /* [RFC1863] */
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#define BA_RCID_PATH 0x0d
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#define BA_MP_REACH_NLRI 0x0e /* [RFC2283] */
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#define BA_MP_UNREACH_NLRI 0x0f
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#define BA_EXTENDED_COMM 0x10 /* draft-ramachandra-bgp-ext-communities */
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/* BGP states */
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#define BS_IDLE 0
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#define BS_CONNECT 1 /* Attempting to connect */
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#define BS_ACTIVE 2 /* Waiting for connection retry & listening */
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#define BS_OPENSENT 3
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#define BS_OPENCONFIRM 4
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#define BS_ESTABLISHED 5
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#endif
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@ -14,7 +14,8 @@ CF_HDR
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CF_DECLS
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CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS)
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CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY, KEEPALIVE,
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MULTIHOP)
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CF_GRAMMAR
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@ -23,6 +24,9 @@ CF_ADDTO(proto, bgp_proto '}' { bgp_check(BGP_CFG); } )
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bgp_proto_start: proto_start BGP {
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this_proto = proto_config_new(&proto_bgp, sizeof(struct bgp_config));
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this_proto->preference = DEF_PREF_BGP;
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BGP_CFG->hold_time = 240;
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BGP_CFG->connect_retry_time = 120;
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BGP_CFG->keepalive_time = 30;
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}
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;
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@ -38,6 +42,10 @@ bgp_proto:
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BGP_CFG->remote_ip = $3;
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BGP_CFG->remote_as = $5;
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}
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| bgp_proto HOLD TIME NUM ';' { BGP_CFG->hold_time = $4; }
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| bgp_proto CONNECT RETRY TIME NUM ';' { BGP_CFG->connect_retry_time = $5; }
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| bgp_proto KEEPALIVE TIME NUM ';' { BGP_CFG->connect_retry_time = $4; }
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| bgp_proto MULTIHOP NUM ';' { BGP_CFG->multihop = $3; }
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;
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CF_CODE
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15
proto/bgp/packets.c
Normal file
15
proto/bgp/packets.c
Normal file
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@ -0,0 +1,15 @@
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/*
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* BIRD -- BGP Packet Processing
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*
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* (c) 2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "nest/bird.h"
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#include "nest/iface.h"
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#include "nest/protocol.h"
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#include "nest/route.h"
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#include "conf/conf.h"
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#include "bgp.h"
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