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-rw-r--r--proto/bgp/bgp.c22
-rw-r--r--proto/bgp/bgp.h13
-rw-r--r--proto/bgp/config.Y3
-rw-r--r--proto/bgp/packets.c29
4 files changed, 53 insertions, 14 deletions
diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c
index 9e28b278..f549b0ed 100644
--- a/proto/bgp/bgp.c
+++ b/proto/bgp/bgp.c
@@ -569,6 +569,7 @@ bgp_send_open(struct bgp_conn *conn)
conn->peer_gr_time = 0;
conn->peer_gr_flags = 0;
conn->peer_gr_aflags = 0;
+ conn->peer_ext_messages_support = 0;
DBG("BGP: Sending open\n");
conn->sk->rx_hook = bgp_rx;
@@ -733,8 +734,8 @@ bgp_connect(struct bgp_proto *p) /* Enter Connect state and start establishing c
s->dport = p->cf->remote_port;
s->iface = p->neigh ? p->neigh->iface : NULL;
s->ttl = p->cf->ttl_security ? 255 : hops;
- s->rbsize = BGP_RX_BUFFER_SIZE;
- s->tbsize = BGP_TX_BUFFER_SIZE;
+ s->rbsize = p->cf->enable_extended_messages ? BGP_RX_BUFFER_EXT_SIZE : BGP_RX_BUFFER_SIZE;
+ s->tbsize = p->cf->enable_extended_messages ? BGP_TX_BUFFER_EXT_SIZE : BGP_TX_BUFFER_SIZE;
s->tos = IP_PREC_INTERNET_CONTROL;
s->password = p->cf->password;
s->tx_hook = bgp_connected;
@@ -843,6 +844,13 @@ bgp_incoming_connection(sock *sk, int dummy UNUSED)
if (sk_set_min_ttl(sk, 256 - hops) < 0)
goto err;
+ if (p->cf->enable_extended_messages)
+ {
+ sk->rbsize = BGP_RX_BUFFER_EXT_SIZE;
+ sk->tbsize = BGP_TX_BUFFER_EXT_SIZE;
+ sk_reallocate(sk);
+ }
+
bgp_setup_conn(p, &p->incoming_conn);
bgp_setup_sk(&p->incoming_conn, sk);
bgp_send_open(&p->incoming_conn);
@@ -1518,21 +1526,23 @@ bgp_show_proto_info(struct proto *P)
else if (P->proto_state == PS_UP)
{
cli_msg(-1006, " Neighbor ID: %R", p->remote_id);
- cli_msg(-1006, " Neighbor caps: %s%s%s%s%s%s",
+ cli_msg(-1006, " Neighbor caps: %s%s%s%s%s%s%s",
c->peer_refresh_support ? " refresh" : "",
c->peer_enhanced_refresh_support ? " enhanced-refresh" : "",
c->peer_gr_able ? " restart-able" : (c->peer_gr_aware ? " restart-aware" : ""),
c->peer_as4_support ? " AS4" : "",
(c->peer_add_path & ADD_PATH_RX) ? " add-path-rx" : "",
- (c->peer_add_path & ADD_PATH_TX) ? " add-path-tx" : "");
- cli_msg(-1006, " Session: %s%s%s%s%s%s%s",
+ (c->peer_add_path & ADD_PATH_TX) ? " add-path-tx" : "",
+ c->peer_ext_messages_support ? " ext-messages" : "");
+ cli_msg(-1006, " Session: %s%s%s%s%s%s%s%s",
p->is_internal ? "internal" : "external",
p->cf->multihop ? " multihop" : "",
p->rr_client ? " route-reflector" : "",
p->rs_client ? " route-server" : "",
p->as4_session ? " AS4" : "",
p->add_path_rx ? " add-path-rx" : "",
- p->add_path_tx ? " add-path-tx" : "");
+ p->add_path_tx ? " add-path-tx" : "",
+ p->ext_messages ? " ext-messages" : "");
cli_msg(-1006, " Source address: %I", p->source_addr);
if (P->cf->in_limit)
cli_msg(-1006, " Route limit: %d/%d",
diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h
index b6e80fe5..274794f1 100644
--- a/proto/bgp/bgp.h
+++ b/proto/bgp/bgp.h
@@ -40,6 +40,7 @@ struct bgp_config {
int capabilities; /* Enable capability handshake [RFC3392] */
int enable_refresh; /* Enable local support for route refresh [RFC2918] */
int enable_as4; /* Enable local support for 4B AS numbers [RFC4893] */
+ int enable_extended_messages; /* Enable local support for extended messages [draft] */
u32 rr_cluster_id; /* Route reflector cluster ID, if different from local ID */
int rr_client; /* Whether neighbor is RR client of me */
int rs_client; /* Whether neighbor is RS client of me */
@@ -109,6 +110,7 @@ struct bgp_conn {
u16 peer_gr_time;
u8 peer_gr_flags;
u8 peer_gr_aflags;
+ u8 peer_ext_messages_support; /* Peer supports extended message length [draft] */
unsigned hold_time, keepalive_time; /* Times calculated from my and neighbor's requirements */
};
@@ -121,6 +123,7 @@ struct bgp_proto {
u8 as4_session; /* Session uses 4B AS numbers in AS_PATH (both sides support it) */
u8 add_path_rx; /* Session expects receive of ADD-PATH extended NLRI */
u8 add_path_tx; /* Session expects transmit of ADD-PATH extended NLRI */
+ u8 ext_messages; /* Session allows to use extended messages (both sides support it) */
u32 local_id; /* BGP identifier of this router */
u32 remote_id; /* BGP identifier of the neighbor */
u32 rr_cluster_id; /* Route reflector cluster ID */
@@ -180,9 +183,15 @@ struct bgp_bucket {
#define BGP_PORT 179
#define BGP_VERSION 4
#define BGP_HEADER_LENGTH 19
-#define BGP_MAX_PACKET_LENGTH 4096
+#define BGP_MAX_MESSAGE_LENGTH 4096
+#define BGP_MAX_EXT_MSG_LENGTH 65535
#define BGP_RX_BUFFER_SIZE 4096
-#define BGP_TX_BUFFER_SIZE BGP_MAX_PACKET_LENGTH
+#define BGP_TX_BUFFER_SIZE 4096
+#define BGP_RX_BUFFER_EXT_SIZE 65535
+#define BGP_TX_BUFFER_EXT_SIZE 65535
+
+static inline int bgp_max_packet_length(struct bgp_proto *p)
+{ return p->ext_messages ? BGP_MAX_EXT_MSG_LENGTH : BGP_MAX_MESSAGE_LENGTH; }
extern struct linpool *bgp_linpool;
diff --git a/proto/bgp/config.Y b/proto/bgp/config.Y
index 49afe5ae..85b93a6b 100644
--- a/proto/bgp/config.Y
+++ b/proto/bgp/config.Y
@@ -27,7 +27,7 @@ CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY,
INTERPRET, COMMUNITIES, BGP_ORIGINATOR_ID, BGP_CLUSTER_LIST, IGP,
TABLE, GATEWAY, DIRECT, RECURSIVE, MED, TTL, SECURITY, DETERMINISTIC,
SECONDARY, ALLOW, BFD, ADD, PATHS, RX, TX, GRACEFUL, RESTART, AWARE,
- CHECK, LINK, PORT)
+ CHECK, LINK, PORT, EXTENDED, MESSAGES)
CF_GRAMMAR
@@ -108,6 +108,7 @@ bgp_proto:
| bgp_proto DISABLE AFTER ERROR bool ';' { BGP_CFG->disable_after_error = $5; }
| bgp_proto ENABLE ROUTE REFRESH bool ';' { BGP_CFG->enable_refresh = $5; }
| bgp_proto ENABLE AS4 bool ';' { BGP_CFG->enable_as4 = $4; }
+ | bgp_proto ENABLE EXTENDED MESSAGES bool ';' { BGP_CFG->enable_extended_messages = $5; }
| bgp_proto CAPABILITIES bool ';' { BGP_CFG->capabilities = $3; }
| bgp_proto ADVERTISE IPV4 bool ';' { BGP_CFG->advertise_ipv4 = $4; }
| bgp_proto PASSWORD text ';' { BGP_CFG->password = $3; }
diff --git a/proto/bgp/packets.c b/proto/bgp/packets.c
index 378f5ab1..ed99f623 100644
--- a/proto/bgp/packets.c
+++ b/proto/bgp/packets.c
@@ -84,7 +84,7 @@ mrt_put_bgp4_hdr(byte *buf, struct bgp_conn *conn, int as4)
static void
mrt_dump_bgp_packet(struct bgp_conn *conn, byte *pkt, unsigned len)
{
- byte buf[BGP_MAX_PACKET_LENGTH + 128];
+ byte *buf = alloca(128+len); /* 128 is enough for MRT headers */
byte *bp = buf + MRTDUMP_HDR_LENGTH;
int as4 = conn->bgp->as4_session;
@@ -223,6 +223,14 @@ bgp_put_cap_err(struct bgp_proto *p UNUSED, byte *buf)
return buf;
}
+static byte *
+bgp_put_cap_ext_msg(struct bgp_proto *p UNUSED, byte *buf)
+{
+ *buf++ = 230; /* Capability TBD: Support for extended messages */
+ *buf++ = 0; /* Capability data length */
+ return buf;
+}
+
static byte *
bgp_create_open(struct bgp_conn *conn, byte *buf)
@@ -274,6 +282,9 @@ bgp_create_open(struct bgp_conn *conn, byte *buf)
if (p->cf->enable_refresh)
cap = bgp_put_cap_err(p, cap);
+ if (p->cf->enable_extended_messages)
+ cap = bgp_put_cap_ext_msg(p, cap);
+
cap_len = cap - buf - 12;
if (cap_len > 0)
{
@@ -342,7 +353,7 @@ bgp_create_update(struct bgp_conn *conn, byte *buf)
{
struct bgp_proto *p = conn->bgp;
struct bgp_bucket *buck;
- int remains = BGP_MAX_PACKET_LENGTH - BGP_HEADER_LENGTH - 4;
+ int remains = bgp_max_packet_length(p) - BGP_HEADER_LENGTH - 4;
byte *w;
int wd_size = 0;
int r_size = 0;
@@ -428,7 +439,7 @@ bgp_create_update(struct bgp_conn *conn, byte *buf)
struct bgp_proto *p = conn->bgp;
struct bgp_bucket *buck;
int size, second, rem_stored;
- int remains = BGP_MAX_PACKET_LENGTH - BGP_HEADER_LENGTH - 4;
+ int remains = bgp_max_packet_length(p) - BGP_HEADER_LENGTH - 4;
byte *w, *w_stored, *tmp, *tstart;
ip_addr *ipp, ip, ip_ll;
ea_list *ea;
@@ -856,6 +867,12 @@ bgp_parse_capabilities(struct bgp_conn *conn, byte *opt, int len)
conn->peer_enhanced_refresh_support = 1;
break;
+ case 230: /* Extended message length capability, draft, cap number TBD */
+ if (cl != 0)
+ goto err;
+ conn->peer_ext_messages_support = 1;
+ break;
+
/* We can safely ignore all other capabilities */
}
len -= 2 + cl;
@@ -1019,6 +1036,7 @@ bgp_rx_open(struct bgp_conn *conn, byte *pkt, int len)
p->add_path_rx = (p->cf->add_path & ADD_PATH_RX) && (conn->peer_add_path & ADD_PATH_TX);
p->add_path_tx = (p->cf->add_path & ADD_PATH_TX) && (conn->peer_add_path & ADD_PATH_RX);
p->gr_ready = p->cf->gr_mode && conn->peer_gr_able;
+ p->ext_messages = p->cf->enable_extended_messages && conn->peer_ext_messages_support;
if (p->add_path_tx)
p->p.accept_ra_types = RA_ANY;
@@ -1418,7 +1436,7 @@ static struct {
{ 2, 4, "Unsupported optional parameter" },
{ 2, 5, "Authentication failure" },
{ 2, 6, "Unacceptable hold time" },
- { 2, 7, "Required capability missing" }, /* [RFC3392] */
+ { 2, 7, "Required capability missing" }, /* [RFC5492] */
{ 2, 8, "No supported AFI/SAFI" }, /* This error msg is nonstandard */
{ 3, 0, "Invalid UPDATE message" },
{ 3, 1, "Malformed attribute list" },
@@ -1666,6 +1684,7 @@ int
bgp_rx(sock *sk, int size)
{
struct bgp_conn *conn = sk->data;
+ struct bgp_proto *p = conn->bgp;
byte *pkt_start = sk->rbuf;
byte *end = pkt_start + size;
unsigned i, len;
@@ -1682,7 +1701,7 @@ bgp_rx(sock *sk, int size)
break;
}
len = get_u16(pkt_start+16);
- if (len < BGP_HEADER_LENGTH || len > BGP_MAX_PACKET_LENGTH)
+ if (len < BGP_HEADER_LENGTH || len > bgp_max_packet_length(p))
{
bgp_error(conn, 1, 2, pkt_start+16, 2);
break;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 15:47:07 +0000