X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/350b06e6f4e8c49fc68105c834e99db226de8720..ae7d3c9fca4afa0dcc83095c4405ce3461276075:/bgp.c diff --git a/bgp.c b/bgp.c index 31e6424..901ea55 100644 --- a/bgp.c +++ b/bgp.c @@ -101,7 +101,7 @@ int bgp_setup(int as) /* start connection with a peer */ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive, - int hold, int enable) + int hold, struct in_addr update_source, int enable) { struct hostent *h; int ibgp; @@ -130,6 +130,7 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive, } memcpy(&peer->addr, h->h_addr, sizeof(peer->addr)); + peer->source_addr = update_source.s_addr; peer->as = as > 0 ? as : our_as; ibgp = peer->as == our_as; @@ -232,7 +233,14 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive, /* NEXT_HOP */ a.flags = BGP_PATH_ATTR_FLAG_TRANS; a.code = BGP_PATH_ATTR_CODE_NEXT_HOP; - ip = my_address; /* we're it */ + if (config->nexthop_address) + { + ip = config->nexthop_address; + } + else + { + ip = my_address; /* we're it */ + } a.data.s.len = sizeof(ip); memcpy(a.data.s.value, &ip, sizeof(ip)); @@ -905,6 +913,7 @@ static int bgp_connect(struct bgp_peer *peer) { static int bgp_port = 0; struct sockaddr_in addr; + struct sockaddr_in source_addr; struct epoll_event ev; if (!bgp_port) @@ -936,6 +945,19 @@ static int bgp_connect(struct bgp_peer *peer) /* set to non-blocking */ fcntl(peer->sock, F_SETFL, fcntl(peer->sock, F_GETFL, 0) | O_NONBLOCK); + /* set source address */ + memset(&source_addr, 0, sizeof(source_addr)); + source_addr.sin_family = AF_INET; + source_addr.sin_addr.s_addr = peer->source_addr; /* defaults to INADDR_ANY */ + if (bind(peer->sock, (struct sockaddr *) &source_addr, sizeof(source_addr)) < 0) + { + LOG(1, 0, 0, "Can't set source address to %s: %s\n", + inet_ntoa(source_addr.sin_addr), strerror(errno)); + + bgp_set_retry(peer); + return 0; + } + /* try connect */ memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; @@ -1294,7 +1316,7 @@ static int bgp_handle_input(struct bgp_peer *peer) if (notification->error_code == BGP_ERR_CEASE) { LOG(4, 0, 0, "BGP peer %s sent CEASE\n", peer->name); - bgp_restart(peer); + bgp_set_retry(peer); return 0; } @@ -1303,7 +1325,7 @@ static int bgp_handle_input(struct bgp_peer *peer) { LOG(4, 0, 0, "BGP peer %s doesn't support BGP Capabilities\n", peer->name); peer->mp_handling = DoesntHandleIPv6Routes; - bgp_restart(peer); + bgp_set_retry(peer); return 0; } @@ -1361,7 +1383,11 @@ static int bgp_send_open(struct bgp_peer *peer) data.version = BGP_VERSION; data.as = htons(our_as); data.hold_time = htons(peer->hold); - data.identifier = my_address; + /* use the source IP we use as identifier, if available */ + if (peer->source_addr != INADDR_ANY) + data.identifier = peer->source_addr; + else + data.identifier = my_address; /* if we know peer doesn't support MP (mp_handling == DoesntHandleIPv6Routes) then don't add this parameter */ @@ -1555,9 +1581,9 @@ static int bgp_send_update(struct bgp_peer *peer) /* send/buffer UPDATE message for IPv6 routes */ static int bgp_send_update6(struct bgp_peer *peer) { - uint16_t unf_len = 0; uint16_t attr_len; - char *unreach_len; + uint16_t unreach_len = 0; + char *unreach_len_pos; uint8_t reach_len; uint16_t len = sizeof(peer->outbuf->packet.header); struct bgp_route6_list *have = peer->routes6; @@ -1580,24 +1606,24 @@ static int bgp_send_update6(struct bgp_peer *peer) peer->outbuf->packet.header.type = BGP_MSG_UPDATE; - /* insert non-MP unf_len */ - memcpy(data, &unf_len, sizeof(unf_len)); - /* skip over attr_len too; will be filled when known */ - data += sizeof(unf_len) + sizeof(attr_len); - len += sizeof(unf_len) + sizeof(attr_len); + /* insert non-MP unfeasible routes length */ + memcpy(data, &unreach_len, sizeof(unreach_len)); + /* skip over it and attr_len too; it will be filled when known */ + data += sizeof(unreach_len) + sizeof(attr_len); + len += sizeof(unreach_len) + sizeof(attr_len); /* copy usual attributes */ memcpy(data, peer->path_attrs, peer->path_attr_len_without_nexthop); data += peer->path_attr_len_without_nexthop; - len += peer->path_attr_len_without_nexthop; + attr_len = peer->path_attr_len_without_nexthop; /* copy MP unreachable NLRI heading */ memcpy(data, peer->mp_unreach_nlri_partial, BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE); /* remember where to update this attr len */ - unreach_len = data + 2; + unreach_len_pos = data + 2; data += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; - len += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; + attr_len += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; peer->update_routes6 = 0; /* tentatively clear */ @@ -1619,8 +1645,8 @@ static int bgp_send_update6(struct bgp_peer *peer) s = BGP_IP_PREFIX_SIZE(tmp->dest); memcpy(data, &tmp->dest, s); data += s; - unf_len += s; - len += s; + unreach_len += s; + attr_len += s; LOG(5, 0, 0, "Withdrawing route %s/%d from BGP peer %s\n", inet_ntop(AF_INET6, &tmp->dest.prefix, ipv6addr, INET6_ADDRSTRLEN), @@ -1662,21 +1688,21 @@ static int bgp_send_update6(struct bgp_peer *peer) peer->update_routes6 = 1; /* more to do */ /* anything changed? */ - if (!(unf_len || add)) + if (!(unreach_len || add)) return 1; - if (unf_len) + if (unreach_len) { - /* go back and insert MP unf_len */ - unf_len += sizeof(struct bgp_attr_mp_unreach_nlri_partial); - unf_len = htons(unf_len); - memcpy(unreach_len, &unf_len, sizeof(unf_len)); + /* go back and insert MP unreach_len */ + unreach_len += sizeof(struct bgp_attr_mp_unreach_nlri_partial); + unreach_len = htons(unreach_len); + memcpy(unreach_len_pos, &unreach_len, sizeof(unreach_len)); } else { /* we can remove this attribute, then */ data -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; - len -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; + attr_len -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; } if (add) @@ -1701,20 +1727,23 @@ static int bgp_send_update6(struct bgp_peer *peer) reach_len = BGP_IP_PREFIX_SIZE(add->dest); data[2] = sizeof(struct bgp_attr_mp_reach_nlri_partial) + reach_len; data += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE; - len += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE; + attr_len += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE; memcpy(data, &add->dest, reach_len); data += reach_len; - len += reach_len; + attr_len += reach_len; LOG(5, 0, 0, "Advertising route %s/%d to BGP peer %s\n", inet_ntop(AF_INET6, &add->dest.prefix, ipv6addr, INET6_ADDRSTRLEN), add->dest.len, peer->name); } + /* update len with attributes we added */ + len += attr_len; + /* go back and insert attr_len */ - attr_len = htons(len - 4); - memcpy(&peer->outbuf->packet.data + 2, &attr_len, sizeof(attr_len)); + attr_len = htons(attr_len); + memcpy((char *)&peer->outbuf->packet.data + 2, &attr_len, sizeof(attr_len)); peer->outbuf->packet.header.len = htons(len); peer->outbuf->done = 0;