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bgpd: add L2 attr community support as per RFC8214

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The L2 attribute extended community can not be decoded when using L2VPN
EVPN as a route reflector. Decode the extended community and dump the
detailed information about flags and MTU information.

> rt4# show bgp l2vpn evpn
> BGP table version is 1, local router ID is 4.4.4.4
> Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
> EVPN type-1 prefix: [1]:[EthTag]:[ESI]:[IPlen]:[VTEP-IP]:[Frag-id]
> EVPN type-2 prefix: [2]:[EthTag]:[MAClen]:[MAC]:[IPlen]:[IP]
> EVPN type-3 prefix: [3]:[EthTag]:[IPlen]:[OrigIP]
> EVPN type-4 prefix: [4]:[ESI]:[IPlen]:[OrigIP]
> EVPN type-5 prefix: [5]:[EthTag]:[IPlen]:[IP]
>
>    Network          Next Hop            Metric LocPrf Weight Path
> Route Distinguisher: 1.1.1.1:100
>  *>i[1]:[12]:[00:00:00:00:00:00:00:00:00:00]:[32]:[0.0.0.0]:[0]
>                     1.1.1.1                       100      0 i
>                     RT:65500:100 L2: P flag:N, B Flag N, C word N, MTU 0
> Route Distinguisher: 5.5.5.5:100
>  *>i[1]:[10]:[00:00:00:00:00:00:00:00:00:00]:[32]:[0.0.0.0]:[0]
>                     5.5.5.5                       100      0 i
>                     RT:65500:100 L2: P flag:N, B Flag N, C word N, MTU 0
>

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2025-02-03 16:08:45 +01:00
parent f74fa9543b
commit af8e792205
2 changed files with 31 additions and 0 deletions
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25
bgpd/bgp_ecommunity.c
View File

@ -1337,6 +1337,31 @@ char *ecommunity_ecom2str(struct ecommunity *ecom, int format, int filter)
snprintf(encbuf, sizeof(encbuf),
"DF: (alg: %u, pref: %u)", alg,
pref);
} else if (*pnt == ECOMMUNITY_EVPN_SUBTYPE_LAYER2_ATTR) {
uint16_t flags, l2mtu;
++pnt;
memcpy(&flags, pnt, 2);
++pnt;
++pnt;
memcpy(&l2mtu, pnt, 2);
snprintf(encbuf, sizeof(encbuf),
"L2: P flag:%c, B Flag %c, C word %c, MTU %d",
CHECK_FLAG(flags,
ECOMMUNITY_EVPN_SUBTYPE_LAYER2_ATTR_PRIMARY_PE_FLAG)
? 'Y'
: 'N',
CHECK_FLAG(flags,
ECOMMUNITY_EVPN_SUBTYPE_LAYER2_ATTR_BACKUP_PE_FLAG)
? 'Y'
: 'N',
CHECK_FLAG(flags,
ECOMMUNITY_EVPN_SUBTYPE_LAYER2_ATTR_CONTROL_WORD_FLAG)
? 'Y'
: 'N',
l2mtu);
} else
unk_ecom = true;
} else if (type == ECOMMUNITY_ENCODE_REDIRECT_IP_NH) {

6
bgpd/bgp_ecommunity.h
View File

@ -68,12 +68,18 @@
#define ECOMMUNITY_EVPN_SUBTYPE_ESI_LABEL 0x01
#define ECOMMUNITY_EVPN_SUBTYPE_ES_IMPORT_RT 0x02
#define ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC 0x03
#define ECOMMUNITY_EVPN_SUBTYPE_LAYER2_ATTR 0x04
#define ECOMMUNITY_EVPN_SUBTYPE_DF_ELECTION 0x06
#define ECOMMUNITY_EVPN_SUBTYPE_DEF_GW 0x0d
#define ECOMMUNITY_EVPN_SUBTYPE_ND 0x08
#define ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY_FLAG_STICKY 0x01
/* Layer2 Attributes: RFC8214 */
#define ECOMMUNITY_EVPN_SUBTYPE_LAYER2_ATTR_PRIMARY_PE_FLAG 0x01
#define ECOMMUNITY_EVPN_SUBTYPE_LAYER2_ATTR_BACKUP_PE_FLAG 0x02
#define ECOMMUNITY_EVPN_SUBTYPE_LAYER2_ATTR_CONTROL_WORD_FLAG 0x04
/* DF alg bits - only lower 5 bits are applicable */
#define ECOMMUNITY_EVPN_SUBTYPE_DF_ALG_BITS 0x1f