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isisd: Unpack SRv6 (LAN) End.X SID Sub-TLV

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Extend the Extended IS Reachability TLV unpack function to unpack the
SRv6 End.X SID Sub-TLV and SRv6 LAN End.X SID Sub-TLV, if present.

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
This commit is contained in:
Carmine Scarpitta 2023-05-25 15:21:50 +02:00
parent 8b6a73c306
commit d56c0d23b0
2 changed files with 99 additions and 0 deletions
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97
isisd/isis_tlvs.c
View File

@ -120,6 +120,10 @@ static void isis_format_subsubtlvs(struct isis_subsubtlvs *subsubtlvs,
int indent);
static int isis_pack_subsubtlvs(struct isis_subsubtlvs *subsubtlvs,
struct stream *s);
static int unpack_tlvs(enum isis_tlv_context context, size_t avail_len,
struct stream *stream, struct sbuf *log, void *dest,
int indent, bool *unpacked_known_tlvs);
static void isis_free_subsubtlvs(struct isis_subsubtlvs *subsubtlvs);
/* For tests/isisd, TLV text requires ipv4-unicast instead of standard */
static const char *isis_mtid2str_fake(uint16_t mtid)
@ -1656,6 +1660,7 @@ static int unpack_item_ext_subtlvs(uint16_t mtid, uint8_t len, struct stream *s,
uint8_t sum = 0;
uint8_t subtlv_type;
uint8_t subtlv_len;
uint8_t subsubtlv_len;
size_t nb_groups;
uint32_t val;
@ -1994,6 +1999,92 @@ static int unpack_item_ext_subtlvs(uint16_t mtid, uint8_t len, struct stream *s,
SET_SUBTLV(exts, EXT_LAN_ADJ_SID);
}
break;
/* SRv6 End.X SID as per RFC9352 section #8.1 */
case ISIS_SUBTLV_SRV6_ENDX_SID:
if (subtlv_len < ISIS_SUBTLV_SRV6_ENDX_SID_SIZE) {
TLV_SIZE_MISMATCH(log, indent,
"SRv6 End.X SID");
stream_forward_getp(s, subtlv_len);
} else {
struct isis_srv6_endx_sid_subtlv *adj;
adj = XCALLOC(
MTYPE_ISIS_SUBTLV,
sizeof(struct
isis_srv6_endx_sid_subtlv));
adj->flags = stream_getc(s);
adj->algorithm = stream_getc(s);
adj->weight = stream_getc(s);
adj->behavior = stream_getw(s);
stream_get(&adj->sid, s, IPV6_MAX_BYTELEN);
subsubtlv_len = stream_getc(s);
adj->subsubtlvs = isis_alloc_subsubtlvs(
ISIS_CONTEXT_SUBSUBTLV_SRV6_ENDX_SID);
bool unpacked_known_tlvs = false;
if (unpack_tlvs(
ISIS_CONTEXT_SUBSUBTLV_SRV6_ENDX_SID,
subsubtlv_len, s, log,
adj->subsubtlvs, indent + 4,
&unpacked_known_tlvs)) {
XFREE(MTYPE_ISIS_SUBTLV, adj);
break;
}
if (!unpacked_known_tlvs) {
isis_free_subsubtlvs(adj->subsubtlvs);
adj->subsubtlvs = NULL;
}
append_item(&exts->srv6_endx_sid,
(struct isis_item *)adj);
SET_SUBTLV(exts, EXT_SRV6_ENDX_SID);
}
break;
/* SRv6 LAN End.X SID as per RFC9352 section #8.2 */
case ISIS_SUBTLV_SRV6_LAN_ENDX_SID:
if (subtlv_len < ISIS_SUBTLV_SRV6_LAN_ENDX_SID_SIZE) {
TLV_SIZE_MISMATCH(log, indent,
"SRv6 LAN End.X SID");
stream_forward_getp(s, subtlv_len);
} else {
struct isis_srv6_lan_endx_sid_subtlv *lan;
lan = XCALLOC(
MTYPE_ISIS_SUBTLV,
sizeof(struct
isis_srv6_lan_endx_sid_subtlv));
stream_get(&(lan->neighbor_id), s,
ISIS_SYS_ID_LEN);
lan->flags = stream_getc(s);
lan->algorithm = stream_getc(s);
lan->weight = stream_getc(s);
lan->behavior = stream_getw(s);
stream_get(&lan->sid, s, IPV6_MAX_BYTELEN);
subsubtlv_len = stream_getc(s);
lan->subsubtlvs = isis_alloc_subsubtlvs(
ISIS_CONTEXT_SUBSUBTLV_SRV6_ENDX_SID);
bool unpacked_known_tlvs = false;
if (unpack_tlvs(
ISIS_CONTEXT_SUBSUBTLV_SRV6_ENDX_SID,
subsubtlv_len, s, log,
lan->subsubtlvs, indent + 4,
&unpacked_known_tlvs)) {
XFREE(MTYPE_ISIS_SUBTLV, lan);
break;
}
if (!unpacked_known_tlvs) {
isis_free_subsubtlvs(lan->subsubtlvs);
lan->subsubtlvs = NULL;
}
append_item(&exts->srv6_lan_endx_sid,
(struct isis_item *)lan);
SET_SUBTLV(exts, EXT_SRV6_LAN_ENDX_SID);
}
break;
case ISIS_SUBTLV_ASLA:
if (unpack_item_ext_subtlv_asla(mtid, subtlv_len, s,
log, indent,
@ -7147,6 +7238,12 @@ static const struct tlv_ops *const tlv_table[ISIS_CONTEXT_MAX][ISIS_TLV_MAX] = {
},
[ISIS_CONTEXT_SUBSUBTLV_SRV6_END_SID] = {
[ISIS_SUBSUBTLV_SRV6_SID_STRUCTURE] = &subsubtlv_srv6_sid_structure_ops,
},
[ISIS_CONTEXT_SUBSUBTLV_SRV6_ENDX_SID] = {
[ISIS_SUBSUBTLV_SRV6_SID_STRUCTURE] = &subsubtlv_srv6_sid_structure_ops,
},
[ISIS_CONTEXT_SUBSUBTLV_SRV6_LAN_ENDX_SID] = {
[ISIS_SUBSUBTLV_SRV6_SID_STRUCTURE] = &subsubtlv_srv6_sid_structure_ops,
}
};

2
isisd/isis_tlvs.h
View File

@ -423,6 +423,8 @@ enum isis_tlv_context {
ISIS_CONTEXT_SUBTLV_IPV6_REACH,
ISIS_CONTEXT_SUBTLV_SRV6_LOCATOR,
ISIS_CONTEXT_SUBSUBTLV_SRV6_END_SID,
ISIS_CONTEXT_SUBSUBTLV_SRV6_ENDX_SID,
ISIS_CONTEXT_SUBSUBTLV_SRV6_LAN_ENDX_SID,
ISIS_CONTEXT_MAX,
};