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BGP: Separate runtime and config usage of local/remote ip and as fields

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This commit is contained in:
Ondrej Zajicek (work) 2019-04-02 17:22:31 +02:00
parent 3a22a6e858
commit a22c3e5968
5 changed files with 41 additions and 40 deletions
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2
proto/bgp/attrs.c
View file

@ -1733,7 +1733,7 @@ bgp_rte_better(rte *new, rte *old)
return 0;
/* RFC 4271 9.1.2.2. g) Compare peer IP adresses */
return (ipa_compare(new_bgp->cf->remote_ip, old_bgp->cf->remote_ip) < 0);
return ipa_compare(new_bgp->remote_ip, old_bgp->remote_ip) < 0;
}

63
proto/bgp/bgp.c
View file

@ -387,7 +387,7 @@ bgp_close_conn(struct bgp_conn *conn)
void
bgp_update_startup_delay(struct bgp_proto *p)
{
struct bgp_config *cf = p->cf;
const struct bgp_config *cf = p->cf;
DBG("BGP: Updating startup delay\n");
@ -504,8 +504,8 @@ bgp_conn_enter_established_state(struct bgp_conn *conn)
BGP_TRACE(D_EVENTS, "BGP session established");
/* For multi-hop BGP sessions */
if (ipa_zero(p->source_addr))
p->source_addr = conn->sk->saddr;
if (ipa_zero(p->local_ip))
p->local_ip = conn->sk->saddr;
/* In case of LLv6 is not valid during BGP start */
if (ipa_zero(p->link_addr) && p->neigh && p->neigh->iface && p->neigh->iface->llv6)
@ -1047,8 +1047,8 @@ bgp_connect(struct bgp_proto *p) /* Enter Connect state and start establishing c
DBG("BGP: Connecting\n");
sock *s = sk_new(p->p.pool);
s->type = SK_TCP_ACTIVE;
s->saddr = p->source_addr;
s->daddr = p->cf->remote_ip;
s->saddr = p->local_ip;
s->daddr = p->remote_ip;
s->dport = p->cf->remote_port;
s->iface = p->neigh ? p->neigh->iface : NULL;
s->vrf = p->p.vrf;
@ -1209,11 +1209,11 @@ bgp_start_neighbor(struct bgp_proto *p)
{
/* Called only for single-hop BGP sessions */
if (ipa_zero(p->source_addr))
p->source_addr = p->neigh->ifa->ip;
if (ipa_zero(p->local_ip))
p->local_ip = p->neigh->ifa->ip;
if (ipa_is_link_local(p->source_addr))
p->link_addr = p->source_addr;
if (ipa_is_link_local(p->local_ip))
p->link_addr = p->local_ip;
else if (p->neigh->iface->llv6)
p->link_addr = p->neigh->iface->llv6->ip;
@ -1302,7 +1302,7 @@ static void
bgp_update_bfd(struct bgp_proto *p, int use_bfd)
{
if (use_bfd && !p->bfd_req)
p->bfd_req = bfd_request_session(p->p.pool, p->cf->remote_ip, p->source_addr,
p->bfd_req = bfd_request_session(p->p.pool, p->remote_ip, p->local_ip,
p->cf->multihop ? NULL : p->neigh->iface,
bgp_bfd_notify, p);
@ -1383,7 +1383,7 @@ static void
bgp_start_locked(struct object_lock *lock)
{
struct bgp_proto *p = lock->data;
struct bgp_config *cf = p->cf;
const struct bgp_config *cf = p->cf;
if (p->p.proto_state != PS_START)
{
@ -1400,10 +1400,10 @@ bgp_start_locked(struct object_lock *lock)
return;
}
neighbor *n = neigh_find(&p->p, cf->remote_ip, cf->iface, NEF_STICKY);
neighbor *n = neigh_find(&p->p, p->remote_ip, cf->iface, NEF_STICKY);
if (!n)
{
log(L_ERR "%s: Invalid remote address %I%J", p->p.name, cf->remote_ip, cf->iface);
log(L_ERR "%s: Invalid remote address %I%J", p->p.name, p->remote_ip, cf->iface);
/* As we do not start yet, we can just disable protocol */
p->p.disabled = 1;
bgp_store_error(p, NULL, BE_MISC, BEM_INVALID_NEXT_HOP);
@ -1414,7 +1414,7 @@ bgp_start_locked(struct object_lock *lock)
p->neigh = n;
if (n->scope <= 0)
BGP_TRACE(D_EVENTS, "Waiting for %I%J to become my neighbor", cf->remote_ip, cf->iface);
BGP_TRACE(D_EVENTS, "Waiting for %I%J to become my neighbor", p->remote_ip, cf->iface);
else if (p->cf->check_link && !(n->iface->flags & IF_LINK_UP))
BGP_TRACE(D_EVENTS, "Waiting for link on %s", n->iface->name);
else
@ -1425,9 +1425,18 @@ static int
bgp_start(struct proto *P)
{
struct bgp_proto *p = (struct bgp_proto *) P;
struct object_lock *lock;
const struct bgp_config *cf = p->cf;
p->local_ip = cf->local_ip;
p->remote_ip = cf->remote_ip;
p->local_as = cf->local_as;
p->remote_as = cf->remote_as;
p->public_as = cf->local_as;
/* Confederation ID is used for truly external peers */
if (p->cf->confederation && !p->is_interior)
p->public_as = cf->confederation;
DBG("BGP: Startup.\n");
p->start_state = BSS_PREPARE;
p->outgoing_conn.state = BS_IDLE;
p->incoming_conn.state = BS_IDLE;
@ -1445,7 +1454,6 @@ bgp_start(struct proto *P)
p->rr_cluster_id = p->cf->rr_cluster_id ? p->cf->rr_cluster_id : p->local_id;
p->remote_id = 0;
p->source_addr = p->cf->local_ip;
p->link_addr = IPA_NONE;
/* Lock all channels when in GR recovery mode */
@ -1460,9 +1468,9 @@ bgp_start(struct proto *P)
* Before attempting to create the connection, we need to lock the port,
* so that we are the only instance attempting to talk with that neighbor.
*/
struct object_lock *lock;
lock = p->lock = olock_new(P->pool);
lock->addr = p->cf->remote_ip;
lock->addr = p->remote_ip;
lock->port = p->cf->remote_port;
lock->iface = p->cf->iface;
lock->vrf = p->cf->iface ? NULL : p->p.vrf;
@ -1570,18 +1578,11 @@ bgp_init(struct proto_config *CF)
P->rte_modify = bgp_rte_modify_stale;
p->cf = cf;
p->local_as = cf->local_as;
p->remote_as = cf->remote_as;
p->public_as = cf->local_as;
p->is_internal = (cf->local_as == cf->remote_as);
p->is_interior = p->is_internal || cf->confederation_member;
p->rs_client = cf->rs_client;
p->rr_client = cf->rr_client;
/* Confederation ID is used for truly external peers */
if (cf->confederation && !p->is_interior)
p->public_as = cf->confederation;
/* Add all channels */
struct bgp_channel_config *cc;
WALK_LIST(cc, CF->channels)
@ -1612,7 +1613,7 @@ bgp_channel_start(struct channel *C)
{
struct bgp_proto *p = (void *) C->proto;
struct bgp_channel *c = (void *) C;
ip_addr src = p->source_addr;
ip_addr src = p->local_ip;
if (c->igp_table_ip4)
rt_lock_table(c->igp_table_ip4);
@ -1893,8 +1894,8 @@ static int
bgp_reconfigure(struct proto *P, struct proto_config *CF)
{
struct bgp_proto *p = (void *) P;
struct bgp_config *new = (void *) CF;
struct bgp_config *old = p->cf;
const struct bgp_config *new = (void *) CF;
const struct bgp_config *old = p->cf;
if (proto_get_router_id(CF) != p->local_id)
return 0;
@ -2241,7 +2242,7 @@ bgp_show_proto_info(struct proto *P)
cli_msg(-1006, " BGP state: %s", bgp_state_dsc(p));
cli_msg(-1006, " Neighbor address: %I%J", p->cf->remote_ip, p->cf->iface);
cli_msg(-1006, " Neighbor AS: %u", p->remote_as);
cli_msg(-1006, " Neighbor AS: %u", p->cf->remote_as);
if (p->gr_active_num)
cli_msg(-1006, " Neighbor graceful restart active");
@ -2277,7 +2278,7 @@ bgp_show_proto_info(struct proto *P)
p->rr_client ? " route-reflector" : "",
p->rs_client ? " route-server" : "",
p->as4_session ? " AS4" : "");
cli_msg(-1006, " Source address: %I", p->source_addr);
cli_msg(-1006, " Source address: %I", p->local_ip);
cli_msg(-1006, " Hold timer: %t/%u",
tm_remains(p->conn->hold_timer), p->conn->hold_time);
cli_msg(-1006, " Keepalive timer: %t/%u",

6
proto/bgp/bgp.h
View file

@ -256,7 +256,8 @@ struct bgp_conn {
struct bgp_proto {
struct proto p;
struct bgp_config *cf; /* Shortcut to BGP configuration */
const struct bgp_config *cf; /* Shortcut to BGP configuration */
ip_addr local_ip, remote_ip;
u32 local_as, remote_as;
u32 public_as; /* Externally visible ASN (local_as or confederation id) */
u32 local_id; /* BGP identifier of this router */
@ -284,8 +285,7 @@ struct bgp_proto {
struct neighbor *neigh; /* Neighbor entry corresponding to remote ip, NULL if multihop */
struct bgp_socket *sock; /* Shared listening socket */
struct bfd_request *bfd_req; /* BFD request, if BFD is used */
ip_addr source_addr; /* Local address used as an advertised next hop */
ip_addr link_addr; /* Link-local version of source_addr */
ip_addr link_addr; /* Link-local version of local_ip */
event *event; /* Event for respawning and shutting process */
timer *startup_timer; /* Timer used to delay protocol startup due to previous errors (startup_delay) */
timer *gr_timer; /* Timer waiting for reestablishment after graceful restart */

6
proto/bgp/packets.c
View file

@ -100,7 +100,7 @@ init_mrt_bgp_data(struct bgp_conn *conn, struct mrt_bgp_data *d)
d->peer_as = p->remote_as;
d->local_as = p->local_as;
d->index = (p->neigh && p->neigh->iface) ? p->neigh->iface->index : 0;
d->af = ipa_is_ip4(p->cf->remote_ip) ? BGP_AFI_IPV4 : BGP_AFI_IPV6;
d->af = ipa_is_ip4(p->remote_ip) ? BGP_AFI_IPV4 : BGP_AFI_IPV6;
d->peer_ip = conn->sk ? conn->sk->daddr : IPA_NONE;
d->local_ip = conn->sk ? conn->sk->saddr : IPA_NONE;
d->as4 = p_ok ? p->as4_session : 0;
@ -1007,7 +1007,7 @@ bgp_update_next_hop_ip(struct bgp_export_state *s, eattr *a, ea_list **to)
WITHDRAW(NO_NEXT_HOP);
ip_addr *nh = (void *) a->u.ptr->data;
ip_addr peer = s->proto->cf->remote_ip;
ip_addr peer = s->proto->remote_ip;
uint len = a->u.ptr->length;
/* Forbid zero next hop */
@ -2325,7 +2325,7 @@ bgp_decode_nlri(struct bgp_parse_state *s, u32 afi, byte *nlri, uint len, ea_lis
a->source = RTS_BGP;
a->scope = SCOPE_UNIVERSE;
a->from = s->proto->cf->remote_ip;
a->from = s->proto->remote_ip;
a->eattrs = ea;
c->desc->decode_next_hop(s, nh, nh_len, a);

4
proto/mrt/mrt.c
View file

@ -361,7 +361,7 @@ mrt_peer_table_dump(struct mrt_table_dump_state *s)
if ((P->proto == &proto_bgp) && (P->proto_state != PS_DOWN))
{
struct bgp_proto *p = (void *) P;
mrt_peer_table_entry(s, p->remote_id, p->remote_as, p->cf->remote_ip);
mrt_peer_table_entry(s, p->remote_id, p->remote_as, p->remote_ip);
}
#endif
@ -429,7 +429,7 @@ mrt_rib_table_entry(struct mrt_table_dump_state *s, rte *r)
{
struct bgp_proto *p = (void *) r->attrs->src->proto;
struct mrt_peer_entry *n =
HASH_FIND(s->peer_hash, PEER, p->remote_id, p->remote_as, p->cf->remote_ip);
HASH_FIND(s->peer_hash, PEER, p->remote_id, p->remote_as, p->remote_ip);
peer = n ? n->index : 0;
}