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isisd: Unpack SRv6 Capabilities Sub-TLV

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Extend Router Capabilities TLV unpack function to unpack SRv6
Capabilities Sub-TLV (RFC 9352 section #2).

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
This commit is contained in:
Carmine Scarpitta 2023-02-02 10:55:25 +01:00
parent 451ef283cc
commit 94b08a4910
1 changed files with 41 additions and 0 deletions
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41
isisd/isis_tlvs.c
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@ -4647,6 +4647,47 @@ static int unpack_tlv_router_cap(enum isis_tlv_context context,
}
break;
#endif /* ifndef FABRICD */
case ISIS_SUBTLV_SRV6_CAPABILITIES:
sbuf_push(log, indent,
"Unpacking SRv6 Capabilities sub-TLV...\n");
/* Check that SRv6 capabilities sub-TLV is correctly
* formated */
if (length < ISIS_SUBTLV_SRV6_CAPABILITIES_SIZE) {
sbuf_push(
log, indent,
"WARNING: Unexpected SRv6 Capabilities sub-TLV size (expected %d or more bytes, got %hhu)\n",
ISIS_SUBTLV_SRV6_CAPABILITIES_SIZE,
length);
stream_forward_getp(s, length);
break;
}
/* Only one SRv6 capabilities is supported. Skip
* subsequent one */
if (rcap->srv6_cap.is_srv6_capable) {
sbuf_push(
log, indent,
"WARNING: SRv6 Capabilities sub-TLV present multiple times, ignoring.\n");
stream_forward_getp(s, length);
break;
}
rcap->srv6_cap.is_srv6_capable = true;
rcap->srv6_cap.flags = stream_getw(s);
/* The SRv6 Capabilities Sub-TLV may contain optional
* Sub-Sub-TLVs, as per RFC 9352 section #2.
* Skip any Sub-Sub-TLV contained in the SRv6
* Capabilities Sub-TLV that is not currently supported
* by IS-IS.
*/
if (length > ISIS_SUBTLV_SRV6_CAPABILITIES_SIZE)
sbuf_push(
log, indent,
"Skipping unknown sub-TLV (%hhu bytes)\n",
length);
stream_forward_getp(
s, length - ISIS_SUBTLV_SRV6_CAPABILITIES_SIZE);
break;
default:
stream_forward_getp(s, length);
break;