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https://gitlab.nic.cz/labs/bird.git
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More BGP. This time it connects, but the state machine still isn't complete.
This commit is contained in:
Martin Mares
parent
320f417357
commit
3fdbafb6f4
@ -22,7 +22,6 @@ 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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@ -63,18 +62,19 @@ bgp_close(struct bgp_proto *p)
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/* FIXME: Automatic restart after errors? */
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}
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static void
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static void /* FIXME: Nobody uses */
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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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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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if (value)
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tm_start(t, value);
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}
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@ -86,36 +86,34 @@ bgp_send_open(struct bgp_conn *conn)
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tm_stop(conn->connect_retry_timer);
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bgp_schedule_packet(conn, PKT_OPEN);
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conn->state = BS_OPENSENT;
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bgp_start_timer(conn->hold_timer, conn->bgp->cf->initial_hold_time);
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}
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static int
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bgp_connected(sock *sk, int dummy)
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static void
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bgp_connected(sock *sk)
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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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struct bgp_conn *conn = t->data;
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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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bgp_connect(conn->bgp);
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}
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static void
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bgp_err(sock *sk, int err)
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bgp_sock_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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@ -125,10 +123,11 @@ bgp_err(sock *sk, int err)
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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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/* FIXME */
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default:
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bug("bgp_err called in invalid state %d", conn->state);
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bug("bgp_sock_err called in invalid state %d", conn->state);
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}
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bgp_close_conn(conn);
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}
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static int
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@ -158,6 +157,24 @@ bgp_incoming_connection(sock *sk, int dummy)
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return 0;
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}
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static void
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bgp_hold_timeout(timer *t)
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{
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struct bgp_conn *conn = t->data;
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DBG("BGP: Hold timeout, closing connection\n"); /* FIXME: Check states? */
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bgp_error(conn, 4, 0, 0, 0);
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}
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static void
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bgp_keepalive_timeout(timer *t)
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{
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struct bgp_conn *conn = t->data;
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DBG("BGP: Keepalive timer\n");
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bgp_schedule_packet(conn, PKT_KEEPALIVE);
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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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@ -168,7 +185,7 @@ bgp_setup_sk(struct bgp_proto *p, struct bgp_conn *conn, sock *s)
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s->rbsize = BGP_RX_BUFFER_SIZE;
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s->tbsize = BGP_TX_BUFFER_SIZE;
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s->tx_hook = bgp_tx;
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s->err_hook = bgp_err;
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s->err_hook = bgp_sock_err;
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s->tos = IP_PREC_INTERNET_CONTROL;
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conn->bgp = p;
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@ -177,27 +194,27 @@ bgp_setup_sk(struct bgp_proto *p, struct bgp_conn *conn, sock *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->data = conn;
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t = conn->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->data = conn;
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t = conn->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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t->data = conn;
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}
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static void
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void
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bgp_close_conn(struct bgp_conn *conn)
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{
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DBG("BGP: Closing connection\n");
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conn->packets_to_send = 0;
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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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sk_close(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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@ -217,12 +234,12 @@ bgp_connect(struct bgp_proto *p) /* Enter Connect state and start establishing c
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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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s->tx_hook = bgp_connected;
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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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bgp_sock_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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@ -294,6 +311,21 @@ bgp_shutdown(struct proto *P)
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return PS_DOWN;
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}
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void
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bgp_error(struct bgp_conn *c, unsigned code, unsigned subcode, unsigned data, unsigned len)
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{
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DBG("BGP: Error %d,%d,%d,%d\n", code, subcode, data, len); /* FIXME: Better messages */
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if (c->error_flag)
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return;
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c->error_flag = 1;
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c->notify_code = code;
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c->notify_subcode = subcode;
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c->notify_arg = data;
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c->notify_arg_size = len;
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proto_notify_state(&c->bgp->p, PS_STOP);
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bgp_schedule_packet(c, PKT_NOTIFICATION);
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}
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void
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bgp_check(struct bgp_config *c)
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{
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@ -14,9 +14,9 @@ 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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unsigned connect_retry_time;
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unsigned hold_time, initial_hold_time;
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unsigned keepalive_time;
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};
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struct bgp_conn {
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@ -26,20 +26,20 @@ struct bgp_conn {
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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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unsigned int packets_to_send; /* Bitmap of packet types to be sent */
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unsigned int notify_code, notify_subcode, notify_arg, notify_arg_size;
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unsigned int error_flag; /* Error state, ignore all input */
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int packets_to_send; /* Bitmap of packet types to be sent */
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int notify_code, notify_subcode, notify_arg, notify_arg_size;
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int error_flag; /* Error state, ignore all input */
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unsigned hold_time, keepalive_time; /* Times calculated from my and neighbor's requirements */
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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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unsigned 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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@ -52,7 +52,10 @@ struct bgp_proto {
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#define BGP_RX_BUFFER_SIZE 4096
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#define BGP_TX_BUFFER_SIZE BGP_MAX_PACKET_LENGTH
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void bgp_start_timer(struct timer *t, int value);
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void bgp_check(struct bgp_config *c);
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void bgp_error(struct bgp_conn *c, unsigned code, unsigned subcode, unsigned data, unsigned len);
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void bgp_close_conn(struct bgp_conn *conn);
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/* attrs.c */
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@ -15,7 +15,7 @@ CF_HDR
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CF_DECLS
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CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY, KEEPALIVE,
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MULTIHOP)
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MULTIHOP, STARTUP)
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CF_GRAMMAR
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@ -26,7 +26,7 @@ bgp_proto_start: proto_start BGP {
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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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BGP_CFG->initial_hold_time = 300;
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}
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;
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@ -43,6 +43,7 @@ bgp_proto:
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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 STARTUP HOLD TIME NUM ';' { BGP_CFG->initial_hold_time = $5; }
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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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@ -53,6 +53,7 @@ static byte *
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bgp_create_update(struct bgp_conn *conn, byte *buf)
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{
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DBG("BGP: Sending update\n");
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bug("Don't know how to create updates");
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}
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@ -64,7 +65,7 @@ bgp_create_header(byte *buf, unsigned int len, unsigned int type)
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buf[18] = type;
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}
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static void
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static int
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bgp_fire_tx(struct bgp_conn *conn)
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{
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unsigned int s = conn->packets_to_send;
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@ -76,8 +77,8 @@ bgp_fire_tx(struct bgp_conn *conn)
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if (s & (1 << PKT_SCHEDULE_CLOSE))
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{
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conn->packets_to_send = 0;
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bug("Scheduled close"); /* FIXME */
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bgp_close_conn(conn);
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return 0;
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}
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if (s & (1 << PKT_NOTIFICATION))
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{
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@ -91,6 +92,7 @@ bgp_fire_tx(struct bgp_conn *conn)
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type = PKT_KEEPALIVE;
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end = pkt; /* Keepalives carry no data */
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DBG("BGP: Sending keepalive\n");
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bgp_start_timer(conn->keepalive_timer, conn->keepalive_time);
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}
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else if (s & (1 << PKT_OPEN))
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{
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@ -105,14 +107,14 @@ bgp_fire_tx(struct bgp_conn *conn)
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if (!end)
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{
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conn->packets_to_send = 0;
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return;
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return 0;
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}
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}
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else
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return;
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return 0;
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conn->packets_to_send = s;
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bgp_create_header(buf, end - buf, type);
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sk_send(sk, end - buf);
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return sk_send(sk, end - buf);
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}
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void
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@ -120,8 +122,9 @@ bgp_schedule_packet(struct bgp_conn *conn, int type)
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{
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DBG("BGP: Scheduling packet type %d\n", type);
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conn->packets_to_send |= 1 << type;
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if (conn->sk->tpos != conn->sk->tbuf)
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bgp_fire_tx(conn);
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if (conn->sk->tpos == conn->sk->tbuf)
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while (bgp_fire_tx(conn))
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;
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}
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void
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@ -130,7 +133,124 @@ bgp_tx(sock *sk)
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struct bgp_conn *conn = sk->data;
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DBG("BGP: TX hook\n");
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bgp_fire_tx(conn);
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while (bgp_fire_tx(conn))
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;
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}
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static void
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bgp_rx_open(struct bgp_conn *conn, byte *pkt, int len)
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{
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struct bgp_proto *p = conn->bgp;
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struct bgp_config *cf = p->cf;
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unsigned as, hold;
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u32 id;
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/* Check state */
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if (conn->state != BS_OPENSENT)
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{ bgp_error(conn, 5, 0, conn->state, 0); }
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/* Check message contents */
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if (len < 29 || len != 29 + pkt[28])
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{ bgp_error(conn, 1, 2, len, 2); return; }
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if (pkt[19] != BGP_VERSION)
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{ bgp_error(conn, 2, 1, pkt[19], 2); return; }
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as = get_u16(pkt+20);
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hold = get_u16(pkt+22);
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id = get_u32(pkt+24);
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DBG("BGP: OPEN as=%d hold=%d id=%08x\n", as, hold, id);
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if (cf->remote_as && as != p->remote_as)
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{ bgp_error(conn, 2, 2, as, 0); return; }
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if (hold > 0 && hold < 3)
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{ bgp_error(conn, 2, 6, hold, 0); return; }
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p->remote_id = id;
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if (pkt[28]) /* Currently we support no optional parameters */
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{ bgp_error(conn, 2, 4, pkt[28], 0); return; }
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if (!id || id == 0xffffffff || id == p->local_id)
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{ bgp_error(conn, 2, 3, id, 0); return; }
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/* FIXME: What to do with the other connection??? */
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ASSERT(conn == &p->conn);
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/* Update our local variables */
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if (hold < p->cf->hold_time)
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conn->hold_time = hold;
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else
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conn->hold_time = p->cf->hold_time;
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conn->keepalive_time = p->cf->keepalive_time ? : conn->hold_time / 3;
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p->remote_as = as;
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p->remote_id = id;
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DBG("BGP: Hold timer set to %d, keepalive to %d, AS to %d, ID to %x\n", conn->hold_time, conn->keepalive_time, p->remote_as, p->remote_id);
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bgp_schedule_packet(conn, PKT_KEEPALIVE);
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bgp_start_timer(conn->hold_timer, conn->hold_time);
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conn->state = BS_OPENCONFIRM;
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}
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static void
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bgp_rx_update(struct bgp_conn *conn, byte *pkt, int len)
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{
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if (conn->state != BS_ESTABLISHED)
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{ bgp_error(conn, 5, 0, conn->state, 0); return; }
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bgp_start_timer(conn->hold_timer, conn->hold_time);
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DBG("BGP: UPDATE (ignored)\n");
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}
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static void
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bgp_rx_notification(struct bgp_conn *conn, byte *pkt, int len)
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{
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unsigned arg;
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if (len < 21)
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{
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bgp_error(conn, 1, 2, len, 2);
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return;
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}
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switch (len)
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{
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case 21: arg = 0; break;
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case 22: arg = pkt[21]; break;
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case 23: arg = get_u16(pkt+21); break;
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case 25: arg = get_u32(pkt+23); break;
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default: DBG("BGP: NOTIFICATION with too much data\n"); /* FIXME */ arg = 0;
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}
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DBG("BGP: NOTIFICATION %d.%d %08x\n", pkt[19], pkt[20], arg); /* FIXME: Better reporting */
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conn->error_flag = 1;
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proto_notify_state(&conn->bgp->p, PS_STOP);
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bgp_schedule_packet(conn, PKT_SCHEDULE_CLOSE);
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}
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static void
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bgp_rx_keepalive(struct bgp_conn *conn, byte *pkt, unsigned len)
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{
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DBG("BGP: KEEPALIVE\n");
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bgp_start_timer(conn->hold_timer, conn->hold_time);
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switch (conn->state)
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{
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case BS_OPENCONFIRM:
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DBG("BGP: UP!!!\n");
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conn->state = BS_ESTABLISHED;
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proto_notify_state(&conn->bgp->p, PS_UP);
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break;
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case BS_ESTABLISHED:
|
||||
break;
|
||||
default:
|
||||
bgp_error(conn, 5, 0, conn->state, 0);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
bgp_rx_packet(struct bgp_conn *conn, byte *pkt, unsigned len)
|
||||
{
|
||||
DBG("BGP: Got packet %02x (%d bytes)\n", pkt[18], len);
|
||||
switch (pkt[18])
|
||||
{
|
||||
case PKT_OPEN: return bgp_rx_open(conn, pkt, len);
|
||||
case PKT_UPDATE: return bgp_rx_update(conn, pkt, len);
|
||||
case PKT_NOTIFICATION: return bgp_rx_notification(conn, pkt, len);
|
||||
case PKT_KEEPALIVE: return bgp_rx_keepalive(conn, pkt, len);
|
||||
default: bgp_error(conn, 1, 3, pkt[18], 1);
|
||||
}
|
||||
}
|
||||
|
||||
int
|
||||
@ -139,13 +259,33 @@ bgp_rx(sock *sk, int size)
|
||||
struct bgp_conn *conn = sk->data;
|
||||
byte *pkt_start = sk->rbuf;
|
||||
byte *end = pkt_start + size;
|
||||
unsigned i, len;
|
||||
|
||||
DBG("BGP: RX hook: Got %d bytes\n", size);
|
||||
while (end >= pkt_start + BGP_HEADER_LENGTH)
|
||||
{
|
||||
if (conn->error_flag)
|
||||
{
|
||||
DBG("BGP: Error, dropping input\n");
|
||||
return 1;
|
||||
bug("Incoming packets not handled"); /* FIXME */
|
||||
}
|
||||
for(i=0; i<16; i++)
|
||||
if (pkt_start[i] != 0xff)
|
||||
{
|
||||
bgp_error(conn, 1, 1, 0, 0);
|
||||
break;
|
||||
}
|
||||
len = get_u16(pkt_start+16);
|
||||
if (len < BGP_HEADER_LENGTH || len > BGP_MAX_PACKET_LENGTH)
|
||||
{
|
||||
bgp_error(conn, 1, 2, len, 2);
|
||||
break;
|
||||
}
|
||||
if (end >= pkt_start + len)
|
||||
{
|
||||
bgp_rx_packet(conn, pkt_start, len);
|
||||
pkt_start += len;
|
||||
}
|
||||
}
|
||||
if (pkt_start != sk->rbuf)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user