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bgp_open.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/* BGP open message handling
* Copyright (C) 1998, 1999 Kunihiro Ishiguro
*/
#include <zebra.h>
#include "linklist.h"
#include "prefix.h"
#include "stream.h"
#include "frrevent.h"
#include "log.h"
#include "command.h"
#include "memory.h"
#include "queue.h"
#include "filter.h"
#include "lib/json.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_errors.h"
#include "bgpd/bgp_fsm.h"
#include "bgpd/bgp_packet.h"
#include "bgpd/bgp_open.h"
#include "bgpd/bgp_aspath.h"
#include "bgpd/bgp_vty.h"
#include "bgpd/bgp_memory.h"
const struct message capcode_str[] = {
{ CAPABILITY_CODE_MP, "MultiProtocol Extensions" },
{ CAPABILITY_CODE_REFRESH, "Route Refresh" },
{ CAPABILITY_CODE_ORF, "Cooperative Route Filtering" },
{ CAPABILITY_CODE_RESTART, "Graceful Restart" },
{ CAPABILITY_CODE_AS4, "4-octet AS number" },
{ CAPABILITY_CODE_ADDPATH, "AddPath" },
{ CAPABILITY_CODE_DYNAMIC, "Dynamic" },
{ CAPABILITY_CODE_ENHE, "Extended Next Hop Encoding" },
{ CAPABILITY_CODE_FQDN, "FQDN" },
{ CAPABILITY_CODE_ENHANCED_RR, "Enhanced Route Refresh" },
{ CAPABILITY_CODE_EXT_MESSAGE, "BGP Extended Message" },
{ CAPABILITY_CODE_LLGR, "Long-lived BGP Graceful Restart" },
{ CAPABILITY_CODE_ROLE, "Role" },
{ CAPABILITY_CODE_SOFT_VERSION, "Software Version" },
{ CAPABILITY_CODE_PATHS_LIMIT, "Paths-Limit" },
{ CAPABILITY_CODE_LINK_LOCAL, "Link-Local Next Hop" },
{ 0 }
};
/* Minimum sizes for length field of each cap (so not inc. the header) */
const size_t cap_minsizes[] = {
[CAPABILITY_CODE_MP] = CAPABILITY_CODE_MP_LEN,
[CAPABILITY_CODE_REFRESH] = CAPABILITY_CODE_REFRESH_LEN,
[CAPABILITY_CODE_ORF] = CAPABILITY_CODE_ORF_LEN,
[CAPABILITY_CODE_RESTART] = CAPABILITY_CODE_RESTART_LEN,
[CAPABILITY_CODE_AS4] = CAPABILITY_CODE_AS4_LEN,
[CAPABILITY_CODE_ADDPATH] = CAPABILITY_CODE_ADDPATH_LEN,
[CAPABILITY_CODE_DYNAMIC] = CAPABILITY_CODE_DYNAMIC_LEN,
[CAPABILITY_CODE_ENHE] = CAPABILITY_CODE_ENHE_LEN,
[CAPABILITY_CODE_FQDN] = CAPABILITY_CODE_MIN_FQDN_LEN,
[CAPABILITY_CODE_ENHANCED_RR] = CAPABILITY_CODE_ENHANCED_LEN,
[CAPABILITY_CODE_EXT_MESSAGE] = CAPABILITY_CODE_EXT_MESSAGE_LEN,
[CAPABILITY_CODE_LLGR] = CAPABILITY_CODE_LLGR_LEN,
[CAPABILITY_CODE_ROLE] = CAPABILITY_CODE_ROLE_LEN,
[CAPABILITY_CODE_SOFT_VERSION] = CAPABILITY_CODE_SOFT_VERSION_LEN,
[CAPABILITY_CODE_PATHS_LIMIT] = CAPABILITY_CODE_PATHS_LIMIT_LEN,
[CAPABILITY_CODE_LINK_LOCAL] = CAPABILITY_CODE_LINK_LOCAL_LEN,
};
/* value the capability must be a multiple of.
* 0-data capabilities won't be checked against this.
* Other capabilities whose data doesn't fall on convenient boundaries for this
* table should be set to 1.
*/
const size_t cap_modsizes[] = {
[CAPABILITY_CODE_MP] = 4,
[CAPABILITY_CODE_REFRESH] = 1,
[CAPABILITY_CODE_ORF] = 1,
[CAPABILITY_CODE_RESTART] = 1,
[CAPABILITY_CODE_AS4] = 4,
[CAPABILITY_CODE_ADDPATH] = 4,
[CAPABILITY_CODE_DYNAMIC] = 1,
[CAPABILITY_CODE_ENHE] = 6,
[CAPABILITY_CODE_FQDN] = 1,
[CAPABILITY_CODE_ENHANCED_RR] = 1,
[CAPABILITY_CODE_EXT_MESSAGE] = 1,
[CAPABILITY_CODE_LLGR] = 1,
[CAPABILITY_CODE_ROLE] = 1,
[CAPABILITY_CODE_SOFT_VERSION] = 1,
[CAPABILITY_CODE_PATHS_LIMIT] = 5,
};
/* BGP-4 Multiprotocol Extentions lead us to the complex world. We can
negotiate remote peer supports extentions or not. But if
remote-peer doesn't supports negotiation process itself. We would
like to do manual configuration.
So there is many configurable point. First of all we want set each
peer whether we send capability negotiation to the peer or not.
Next, if we send capability to the peer we want to set my capability
inforation at each peer. */
void bgp_capability_vty_out(struct vty *vty, struct peer *peer, bool use_json,
json_object *json_neigh)
{
char *pnt;
char *end;
struct capability_mp_data mpc;
struct capability_header *hdr;
json_object *json_cap = NULL;
if (use_json)
json_cap = json_object_new_object();
pnt = peer->notify.data;
end = pnt + peer->notify.length;
while (pnt < end) {
if (pnt + sizeof(struct capability_mp_data) + 2 > end)
return;
hdr = (struct capability_header *)pnt;
if (pnt + hdr->length + 2 > end)
return;
memcpy(&mpc, pnt + 2, sizeof(struct capability_mp_data));
if (hdr->code == CAPABILITY_CODE_MP) {
afi_t afi;
safi_t safi;
(void)bgp_map_afi_safi_iana2int(ntohs(mpc.afi),
mpc.safi, &afi, &safi);
if (use_json) {
switch (afi) {
case AFI_IP:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolAfi",
"IPv4");
break;
case AFI_IP6:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolAfi",
"IPv6");
break;
case AFI_L2VPN:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolAfi",
"L2VPN");
break;
case AFI_UNSPEC:
case AFI_MAX:
json_object_int_add(
json_cap,
"capabilityErrorMultiProtocolAfiUnknown",
ntohs(mpc.afi));
break;
}
switch (safi) {
case SAFI_UNICAST:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolSafi",
"unicast");
break;
case SAFI_MULTICAST:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolSafi",
"multicast");
break;
case SAFI_LABELED_UNICAST:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolSafi",
"labeled-unicast");
break;
case SAFI_MPLS_VPN:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolSafi",
"MPLS-labeled VPN");
break;
case SAFI_ENCAP:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolSafi",
"encap");
break;
case SAFI_EVPN:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolSafi",
"EVPN");
break;
case SAFI_FLOWSPEC:
json_object_string_add(
json_cap,
"capabilityErrorMultiProtocolSafi",
"flowspec");
break;
case SAFI_UNSPEC:
case SAFI_MAX:
json_object_int_add(
json_cap,
"capabilityErrorMultiProtocolSafiUnknown",
mpc.safi);
break;
}
} else {
vty_out(vty,
" Capability error for: Multi protocol ");
switch (afi) {
case AFI_IP:
vty_out(vty, "AFI IPv4, ");
break;
case AFI_IP6:
vty_out(vty, "AFI IPv6, ");
break;
case AFI_L2VPN:
vty_out(vty, "AFI L2VPN, ");
break;
case AFI_UNSPEC:
case AFI_MAX:
vty_out(vty, "AFI Unknown %d, ",
ntohs(mpc.afi));
break;
}
switch (safi) {
case SAFI_UNICAST:
vty_out(vty, "SAFI Unicast");
break;
case SAFI_MULTICAST:
vty_out(vty, "SAFI Multicast");
break;
case SAFI_LABELED_UNICAST:
vty_out(vty, "SAFI Labeled-unicast");
break;
case SAFI_MPLS_VPN:
vty_out(vty, "SAFI MPLS-labeled VPN");
break;
case SAFI_ENCAP:
vty_out(vty, "SAFI ENCAP");
break;
case SAFI_FLOWSPEC:
vty_out(vty, "SAFI FLOWSPEC");
break;
case SAFI_EVPN:
vty_out(vty, "SAFI EVPN");
break;
case SAFI_UNSPEC:
case SAFI_MAX:
vty_out(vty, "SAFI Unknown %d ",
mpc.safi);
break;
}
vty_out(vty, "\n");
}
} else if (hdr->code >= 128) {
if (use_json)
json_object_int_add(
json_cap,
"capabilityErrorVendorSpecificCapabilityCode",
hdr->code);
else
vty_out(vty,
" Capability error: vendor specific capability code %d",
hdr->code);
} else {
if (use_json)
json_object_int_add(
json_cap,
"capabilityErrorUnknownCapabilityCode",
hdr->code);
else
vty_out(vty,
" Capability error: unknown capability code %d",
hdr->code);
}
pnt += hdr->length + 2;
}
if (use_json)
json_object_object_add(json_neigh, "capabilityErrors",
json_cap);
}
static void bgp_capability_mp_data(struct stream *s,
struct capability_mp_data *mpc)
{
mpc->afi = stream_getw(s);
mpc->reserved = stream_getc(s);
mpc->safi = stream_getc(s);
}
/* Set negotiated capability value. */
static int bgp_capability_mp(struct peer *peer, struct capability_header *hdr)
{
struct capability_mp_data mpc;
struct stream *s = BGP_INPUT(peer);
afi_t afi;
safi_t safi;
/* Verify length is 4 */
if (hdr->length != 4) {
flog_warn(
EC_BGP_CAPABILITY_INVALID_LENGTH,
"MP Cap: Received invalid length %d, non-multiple of 4",
hdr->length);
return -1;
}
bgp_capability_mp_data(s, &mpc);
if (bgp_debug_neighbor_events(peer))
zlog_debug("%s OPEN has %s capability for afi/safi: %s/%s",
peer->host, lookup_msg(capcode_str, hdr->code, NULL),
iana_afi2str(mpc.afi), iana_safi2str(mpc.safi));
/* Convert AFI, SAFI to internal values, check. */
if (bgp_map_afi_safi_iana2int(mpc.afi, mpc.safi, &afi, &safi))
return -1;
/* Now safi remapped, and afi/safi are valid array indices */
peer->afc_recv[afi][safi] = 1;
if (peer->afc[afi][safi])
peer->afc_nego[afi][safi] = 1;
else
return -1;
return 0;
}
static void bgp_capability_orf_not_support(struct peer *peer, iana_afi_t afi,
iana_safi_t safi, uint8_t type,
uint8_t mode)
{
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %d/%d has ORF type/mode %d/%d not supported",
peer->host, afi, safi, type, mode);
}
const struct message orf_type_str[] = { { ORF_TYPE_RESERVED, "Reserved" },
{ ORF_TYPE_PREFIX, "Prefixlist" },
{ 0 } };
const struct message orf_mode_str[] = { { ORF_MODE_RECEIVE, "Receive" },
{ ORF_MODE_SEND, "Send" },
{ ORF_MODE_BOTH, "Both" },
{ 0 } };
static int bgp_capability_orf_entry(struct peer *peer,
struct capability_header *hdr)
{
struct stream *s = BGP_INPUT(peer);
struct capability_mp_data mpc;
uint8_t num;
iana_afi_t pkt_afi;
afi_t afi;
iana_safi_t pkt_safi;
safi_t safi;
uint8_t type;
uint8_t mode;
uint16_t sm_cap = 0; /* capability send-mode receive */
uint16_t rm_cap = 0; /* capability receive-mode receive */
int i;
/* ORF Entry header */
bgp_capability_mp_data(s, &mpc);
num = stream_getc(s);
pkt_afi = mpc.afi;
pkt_safi = mpc.safi;
if (bgp_debug_neighbor_events(peer))
zlog_debug("%s ORF Cap entry for afi/safi: %s/%s", peer->host,
iana_afi2str(mpc.afi), iana_safi2str(mpc.safi));
/* Convert AFI, SAFI to internal values, check. */
if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
zlog_info(
"%s Addr-family %d/%d not supported. Ignoring the ORF capability",
peer->host, pkt_afi, pkt_safi);
return 0;
}
mpc.afi = pkt_afi;
mpc.safi = safi;
/* validate number field */
if (CAPABILITY_CODE_ORF_LEN + (num * 2) > hdr->length) {
zlog_info(
"%s ORF Capability entry length error, Cap length %u, num %u",
peer->host, hdr->length, num);
bgp_notify_send(peer->connection, BGP_NOTIFY_OPEN_ERR,
BGP_NOTIFY_OPEN_MALFORMED_ATTR);
return -1;
}
for (i = 0; i < num; i++) {
type = stream_getc(s);
mode = stream_getc(s);
/* ORF Mode error check */
switch (mode) {
case ORF_MODE_BOTH:
case ORF_MODE_SEND:
case ORF_MODE_RECEIVE:
break;
default:
bgp_capability_orf_not_support(peer, pkt_afi, pkt_safi,
type, mode);
continue;
}
/* ORF Type and afi/safi error checks */
/* capcode versus type */
switch (hdr->code) {
case CAPABILITY_CODE_ORF:
switch (type) {
case ORF_TYPE_RESERVED:
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %d/%d has reserved ORF type, ignoring",
peer->host, afi, safi);
break;
case ORF_TYPE_PREFIX:
break;
default:
bgp_capability_orf_not_support(
peer, pkt_afi, pkt_safi, type, mode);
continue;
}
break;
default:
bgp_capability_orf_not_support(peer, pkt_afi, pkt_safi,
type, mode);
continue;
}
/* AFI vs SAFI */
if (!((afi == AFI_IP && safi == SAFI_UNICAST)
|| (afi == AFI_IP && safi == SAFI_MULTICAST)
|| (afi == AFI_IP6 && safi == SAFI_UNICAST))) {
bgp_capability_orf_not_support(peer, pkt_afi, pkt_safi,
type, mode);
continue;
}
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s OPEN has %s ORF capability as %s for afi/safi: %s/%s",
peer->host,
lookup_msg(orf_type_str, type, NULL),
lookup_msg(orf_mode_str, mode, NULL),
iana_afi2str(pkt_afi), iana_safi2str(pkt_safi));
if (hdr->code == CAPABILITY_CODE_ORF) {
sm_cap = PEER_CAP_ORF_PREFIX_SM_RCV;
rm_cap = PEER_CAP_ORF_PREFIX_RM_RCV;
} else {
bgp_capability_orf_not_support(peer, pkt_afi, pkt_safi,
type, mode);
continue;
}
switch (mode) {
case ORF_MODE_BOTH:
SET_FLAG(peer->af_cap[afi][safi], sm_cap);
SET_FLAG(peer->af_cap[afi][safi], rm_cap);
break;
case ORF_MODE_SEND:
SET_FLAG(peer->af_cap[afi][safi], sm_cap);
break;
case ORF_MODE_RECEIVE:
SET_FLAG(peer->af_cap[afi][safi], rm_cap);
break;
}
}
return 0;
}
static int bgp_capability_restart(struct peer *peer,
struct capability_header *caphdr)
{
struct stream *s = BGP_INPUT(peer);
uint16_t restart_flag_time;
size_t end = stream_get_getp(s) + caphdr->length;
/* Verify length is a multiple of 4 */
if ((caphdr->length - 2) % 4) {
flog_warn(
EC_BGP_CAPABILITY_INVALID_LENGTH,
"Restart Cap: Received invalid length %d, non-multiple of 4",
caphdr->length);
return -1;
}
SET_FLAG(peer->cap, PEER_CAP_RESTART_RCV);
restart_flag_time = stream_getw(s);
/* The most significant bit is defined in [RFC4724] as
* the Restart State ("R") bit.
*/
if (CHECK_FLAG(restart_flag_time, GRACEFUL_RESTART_R_BIT))
SET_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_R_BIT_RCV);
else
UNSET_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_R_BIT_RCV);
/* The second most significant bit is defined in this
* document as the Graceful Notification ("N") bit.
*/
if (CHECK_FLAG(restart_flag_time, GRACEFUL_RESTART_N_BIT))
SET_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_N_BIT_RCV);
else
UNSET_FLAG(peer->cap, PEER_CAP_GRACEFUL_RESTART_N_BIT_RCV);
UNSET_FLAG(restart_flag_time, 0xF000);
peer->v_gr_restart = restart_flag_time;
if (bgp_debug_neighbor_events(peer))
zlog_debug("%pBP OPEN has GR capability, Restart time %d R-bit %s N-bit %s",
peer, peer->v_gr_restart,
CHECK_FLAG(peer->cap,
PEER_CAP_GRACEFUL_RESTART_R_BIT_RCV)
? "SET"
: "NOT-SET",
CHECK_FLAG(peer->cap,
PEER_CAP_GRACEFUL_RESTART_N_BIT_RCV)
? "SET"
: "NOT-SET");
while (stream_get_getp(s) + 4 <= end) {
afi_t afi;
safi_t safi;
iana_afi_t pkt_afi = stream_getw(s);
iana_safi_t pkt_safi = stream_getc(s);
uint8_t flag = stream_getc(s);
/* Convert AFI, SAFI to internal values, check. */
if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %s/%s(afi/safi) not supported. Ignore the Graceful Restart capability for this AFI/SAFI",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
} else if (!peer->afc[afi][safi]) {
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %s/%s(afi/safi) not enabled. Ignore the Graceful Restart capability",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
} else {
if (bgp_debug_neighbor_events(peer))
zlog_debug("%pBP F-bit %s for %s", peer,
CHECK_FLAG(peer->af_cap[afi][safi],
PEER_CAP_RESTART_AF_PRESERVE_RCV)
? "SET"
: "NOT-SET",
get_afi_safi_str(afi, safi, false));
SET_FLAG(peer->af_cap[afi][safi],
PEER_CAP_RESTART_AF_RCV);
if (CHECK_FLAG(flag, GRACEFUL_RESTART_F_BIT))
SET_FLAG(peer->af_cap[afi][safi],
PEER_CAP_RESTART_AF_PRESERVE_RCV);
}
}
return 0;
}
static int bgp_capability_llgr(struct peer *peer,
struct capability_header *caphdr)
{
struct stream *s = BGP_INPUT(peer);
size_t end = stream_get_getp(s) + caphdr->length;
SET_FLAG(peer->cap, PEER_CAP_LLGR_RCV);
while (stream_get_getp(s) + BGP_CAP_LLGR_MIN_PACKET_LEN <= end) {
afi_t afi;
safi_t safi;
iana_afi_t pkt_afi = stream_getw(s);
iana_safi_t pkt_safi = stream_getc(s);
uint8_t flags = stream_getc(s);
uint32_t stale_time = stream_get3(s);
if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %s/%s(afi/safi) not supported. Ignore the Long-lived Graceful Restart capability for this AFI/SAFI",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
} else if (!peer->afc[afi][safi]
|| !CHECK_FLAG(peer->af_cap[afi][safi],
PEER_CAP_RESTART_AF_RCV)) {
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %s/%s(afi/safi) not enabled. Ignore the Long-lived Graceful Restart capability",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
} else {
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %s/%s(afi/safi) Long-lived Graceful Restart capability stale time %u sec",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi), stale_time);
peer->llgr[afi][safi].flags = flags;
peer->llgr[afi][safi].stale_time =
MIN(stale_time, peer->bgp->llgr_stale_time);
SET_FLAG(peer->af_cap[afi][safi], PEER_CAP_LLGR_AF_RCV);
}
}
return 0;
}
/* Unlike other capability parsing routines, this one returns 0 on error */
static as_t bgp_capability_as4(struct peer *peer, struct capability_header *hdr)
{
if (hdr->length != CAPABILITY_CODE_AS4_LEN) {
flog_err(EC_BGP_PKT_OPEN,
"%s AS4 capability has incorrect data length %d",
peer->host, hdr->length);
return -1;
}
as_t as4 = stream_getl(BGP_INPUT(peer));
SET_FLAG(peer->cap, PEER_CAP_AS4_RCV);
if (BGP_DEBUG(as4, AS4))
zlog_debug(
"%s [AS4] about to set cap PEER_CAP_AS4_RCV, got as4 %u",
peer->host, as4);
return as4;
}
static int bgp_capability_ext_message(struct peer *peer,
struct capability_header *hdr)
{
if (hdr->length != CAPABILITY_CODE_EXT_MESSAGE_LEN) {
flog_err(
EC_BGP_PKT_OPEN,
"%s: BGP Extended Message capability has incorrect data length %d",
peer->host, hdr->length);
return -1;
}
SET_FLAG(peer->cap, PEER_CAP_EXTENDED_MESSAGE_RCV);
return 0;
}
static int bgp_capability_addpath(struct peer *peer,
struct capability_header *hdr)
{
struct stream *s = BGP_INPUT(peer);
size_t end = stream_get_getp(s) + hdr->length;
/* Verify length is a multiple of 4 */
if (hdr->length % CAPABILITY_CODE_ADDPATH_LEN) {
flog_warn(
EC_BGP_CAPABILITY_INVALID_LENGTH,
"Add Path: Received invalid length %d, non-multiple of 4",
hdr->length);
return -1;
}
SET_FLAG(peer->cap, PEER_CAP_ADDPATH_RCV);
while (stream_get_getp(s) + CAPABILITY_CODE_ADDPATH_LEN <= end) {
afi_t afi;
safi_t safi;
iana_afi_t pkt_afi = stream_getw(s);
iana_safi_t pkt_safi = stream_getc(s);
uint8_t send_receive = stream_getc(s);
/* If any other value (other than 1-3) is received, then
* the capability SHOULD be treated as not understood
* and ignored.
*/
if (!send_receive || send_receive > 3) {
flog_warn(EC_BGP_CAPABILITY_INVALID_DATA,
"Add Path: Received invalid send/receive value %u in Add Path capability",
send_receive);
continue;
}
if (bgp_debug_neighbor_events(peer))
zlog_debug("%s OPEN has %s capability for afi/safi: %s/%s%s%s",
peer->host,
lookup_msg(capcode_str, hdr->code, NULL),
iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi),
CHECK_FLAG(send_receive, BGP_ADDPATH_RX)
? ", receive"
: "",
CHECK_FLAG(send_receive, BGP_ADDPATH_TX)
? ", transmit"
: "");
/* Convert AFI, SAFI to internal values, check. */
if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %s/%s(afi/safi) not supported. Ignore the Addpath Attribute for this AFI/SAFI",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
continue;
} else if (!peer->afc[afi][safi]) {
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %s/%s(afi/safi) not enabled. Ignore the AddPath capability for this AFI/SAFI",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
continue;
}
if (CHECK_FLAG(send_receive, BGP_ADDPATH_RX))
SET_FLAG(peer->af_cap[afi][safi],
PEER_CAP_ADDPATH_AF_RX_RCV);
else
UNSET_FLAG(peer->af_cap[afi][safi],
PEER_CAP_ADDPATH_AF_RX_RCV);
if (CHECK_FLAG(send_receive, BGP_ADDPATH_TX))
SET_FLAG(peer->af_cap[afi][safi],
PEER_CAP_ADDPATH_AF_TX_RCV);
else
UNSET_FLAG(peer->af_cap[afi][safi],
PEER_CAP_ADDPATH_AF_TX_RCV);
}
return 0;
}
static int bgp_capability_paths_limit(struct peer *peer,
struct capability_header *hdr)
{
struct stream *s = BGP_INPUT(peer);
size_t end = stream_get_getp(s) + hdr->length;
if (hdr->length % CAPABILITY_CODE_PATHS_LIMIT_LEN) {
flog_warn(EC_BGP_CAPABILITY_INVALID_LENGTH,
"Paths-Limit: Received invalid length %d, non-multiple of %d",
hdr->length, CAPABILITY_CODE_PATHS_LIMIT_LEN);
return -1;
}
if (!CHECK_FLAG(peer->cap, PEER_CAP_ADDPATH_RCV)) {
flog_warn(EC_BGP_CAPABILITY_INVALID_DATA,
"Paths-Limit: Received Paths-Limit capability without Add-Path capability");
return -1;
}
SET_FLAG(peer->cap, PEER_CAP_PATHS_LIMIT_RCV);
while (stream_get_getp(s) + CAPABILITY_CODE_PATHS_LIMIT_LEN <= end) {
afi_t afi;
safi_t safi;
iana_afi_t pkt_afi = stream_getw(s);
iana_safi_t pkt_safi = stream_getc(s);
uint16_t paths_limit = stream_getw(s);
if (bgp_debug_neighbor_events(peer))
zlog_debug("%s OPEN has %s capability for afi/safi: %s/%s limit: %u",
peer->host,
lookup_msg(capcode_str, hdr->code, NULL),
iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi), paths_limit);
if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
if (bgp_debug_neighbor_events(peer))
zlog_debug("%s Addr-family %s/%s(afi/safi) not supported. Ignore the Paths-Limit capability for this AFI/SAFI",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
continue;
} else if (!peer->afc[afi][safi]) {
if (bgp_debug_neighbor_events(peer))
zlog_debug("%s Addr-family %s/%s(afi/safi) not enabled. Ignore the Paths-Limit capability for this AFI/SAFI",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
continue;
}
SET_FLAG(peer->af_cap[afi][safi], PEER_CAP_PATHS_LIMIT_AF_RCV);
peer->addpath_paths_limit[afi][safi].receive = paths_limit;
}
return 0;
}
static int bgp_capability_enhe(struct peer *peer, struct capability_header *hdr)
{
struct stream *s = BGP_INPUT(peer);
size_t end = stream_get_getp(s) + hdr->length;
/* Verify length is a multiple of 4 */
if (hdr->length % 6) {
flog_warn(
EC_BGP_CAPABILITY_INVALID_LENGTH,
"Extended NH: Received invalid length %d, non-multiple of 6",
hdr->length);
return -1;
}
while (stream_get_getp(s) + 6 <= end) {
iana_afi_t pkt_afi = stream_getw(s);
afi_t afi;
iana_safi_t pkt_safi = stream_getw(s);
safi_t safi;
iana_afi_t pkt_nh_afi = stream_getw(s);
afi_t nh_afi;
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Received with afi/safi/next-hop afi: %s/%s/%u",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi), pkt_nh_afi);
/* Convert AFI, SAFI to internal values, check. */
if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%s Addr-family %s/%s(afi/safi) not supported. Ignore the ENHE Attribute for this AFI/SAFI",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
continue;
}
/* RFC 5549 specifies use of this capability only for IPv4 AFI,
* with
* the Nexthop AFI being IPv6. A future spec may introduce other
* possibilities, so we ignore other values with a log. Also,
* only
* SAFI_UNICAST and SAFI_LABELED_UNICAST are currently supported
* (and expected).
*/
nh_afi = afi_iana2int(pkt_nh_afi);
if (afi != AFI_IP || nh_afi != AFI_IP6
|| !(safi == SAFI_UNICAST || safi == SAFI_MPLS_VPN
|| safi == SAFI_LABELED_UNICAST)) {
flog_warn(
EC_BGP_CAPABILITY_INVALID_DATA,
"%s Unexpected afi/safi/next-hop afi: %s/%s/%u in Extended Next-hop capability, ignoring",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi), pkt_nh_afi);
continue;
}
SET_FLAG(peer->af_cap[afi][safi], PEER_CAP_ENHE_AF_RCV);
if (CHECK_FLAG(peer->af_cap[afi][safi], PEER_CAP_ENHE_AF_ADV))
SET_FLAG(peer->af_cap[afi][safi],
PEER_CAP_ENHE_AF_NEGO);
}
SET_FLAG(peer->cap, PEER_CAP_ENHE_RCV);
return 0;
}
static int bgp_capability_hostname(struct peer *peer,
struct capability_header *hdr)
{
struct stream *s = BGP_INPUT(peer);
char str[BGP_MAX_HOSTNAME + 1];
size_t end = stream_get_getp(s) + hdr->length;
uint8_t len;
len = stream_getc(s);
if (stream_get_getp(s) + len > end) {
flog_warn(
EC_BGP_CAPABILITY_INVALID_DATA,
"%s: Received malformed hostname capability from peer %s",
__func__, peer->host);
return -1;
}
if (len > BGP_MAX_HOSTNAME) {
stream_get(str, s, BGP_MAX_HOSTNAME);
stream_forward_getp(s, len - BGP_MAX_HOSTNAME);
len = BGP_MAX_HOSTNAME; /* to set the '\0' below */
} else if (len)
stream_get(str, s, len);
if (len) {
str[len] = '\0';
XFREE(MTYPE_BGP_PEER_HOST, peer->hostname);
XFREE(MTYPE_BGP_PEER_HOST, peer->domainname);
peer->hostname = XSTRDUP(MTYPE_BGP_PEER_HOST, str);
}
if (stream_get_getp(s) + 1 > end) {
flog_warn(
EC_BGP_CAPABILITY_INVALID_DATA,
"%s: Received invalid domain name len (hostname capability) from peer %s",
__func__, peer->host);
return -1;
}
len = stream_getc(s);
if (stream_get_getp(s) + len > end) {
flog_warn(
EC_BGP_CAPABILITY_INVALID_DATA,
"%s: Received runt domain name (hostname capability) from peer %s",
__func__, peer->host);
return -1;
}
if (len > BGP_MAX_HOSTNAME) {
stream_get(str, s, BGP_MAX_HOSTNAME);
stream_forward_getp(s, len - BGP_MAX_HOSTNAME);
len = BGP_MAX_HOSTNAME; /* to set the '\0' below */
} else if (len)
stream_get(str, s, len);
if (len) {
str[len] = '\0';
XFREE(MTYPE_BGP_PEER_HOST, peer->domainname);
peer->domainname = XSTRDUP(MTYPE_BGP_PEER_HOST, str);
}
SET_FLAG(peer->cap, PEER_CAP_HOSTNAME_RCV);
if (bgp_debug_neighbor_events(peer)) {
zlog_debug("%s received hostname %s, domainname %s", peer->host,
peer->hostname, peer->domainname);
}
return 0;
}
static int bgp_capability_role(struct peer *peer, struct capability_header *hdr)
{
if (hdr->length != CAPABILITY_CODE_ROLE_LEN) {
flog_warn(EC_BGP_CAPABILITY_INVALID_LENGTH,
"Role: Received invalid length %d", hdr->length);
return -1;
}
uint8_t role = stream_getc(BGP_INPUT(peer));
SET_FLAG(peer->cap, PEER_CAP_ROLE_RCV);
peer->remote_role = role;
return 0;
}
static int bgp_capability_software_version(struct peer *peer,
struct capability_header *hdr)
{
struct stream *s = BGP_INPUT(peer);
char str[BGP_MAX_SOFT_VERSION + 1];
size_t end = stream_get_getp(s) + hdr->length;
uint8_t len;
len = stream_getc(s);
if (stream_get_getp(s) + len > end) {
flog_warn(
EC_BGP_CAPABILITY_INVALID_DATA,
"%s: Received malformed Software Version capability from peer %s",
__func__, peer->host);
return -1;
}
SET_FLAG(peer->cap, PEER_CAP_SOFT_VERSION_RCV);
if (len > BGP_MAX_SOFT_VERSION) {
flog_warn(EC_BGP_CAPABILITY_INVALID_LENGTH,
"%s: Received Software Version, but the length is too big, truncating, from peer %s",
__func__, peer->host);
stream_get(str, s, BGP_MAX_SOFT_VERSION);
stream_forward_getp(s, len - BGP_MAX_SOFT_VERSION);
len = BGP_MAX_SOFT_VERSION;
} else if (len) {
stream_get(str, s, len);
}
if (len) {
str[len] = '\0';
XFREE(MTYPE_BGP_SOFT_VERSION, peer->soft_version);
peer->soft_version = XSTRDUP(MTYPE_BGP_SOFT_VERSION, str);
if (bgp_debug_neighbor_events(peer))
zlog_debug("%s received Software Version: %s",
peer->host, peer->soft_version);
}