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bgpd: add handling for special label

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Add handling for reserved MPLS label like IMPLICIT_NULL (3).

Signed-off-by: Ryoga Saito <ryoga.saito@linecorp.com>
This commit is contained in:
Ryoga Saito 2022-09-20 18:42:38 +09:00
parent bee2e7d08f
commit d8b596bd23
1 changed files with 20 additions and 3 deletions
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23
bgpd/bgp_mplsvpn.c
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@ -540,8 +540,8 @@ static uint32_t alloc_new_sid(struct bgp *bgp, uint32_t index,
return false;
for (ALL_LIST_ELEMENTS_RO(bgp->srv6_locator_chunks, node, chunk)) {
if (chunk->function_bits_length >
BGP_PREFIX_SID_SRV6_MAX_FUNCTION_LENGTH) {
if (chunk->function_bits_length >
BGP_PREFIX_SID_SRV6_MAX_FUNCTION_LENGTH) {
if (debug)
zlog_debug(
"%s: invalid SRv6 Locator chunk (%pFX): Function Length must be less or equal to %d",
@ -568,15 +568,32 @@ static uint32_t alloc_new_sid(struct bgp *bgp, uint32_t index,
if (index != 0) {
label = index << shift_len;
if (label < MPLS_LABEL_UNRESERVED_MIN) {
if (debug)
zlog_debug(
"%s: skipped to allocate SRv6 SID (%pFX): Label (%u) is too small to use",
__func__, &chunk->prefix,
label);
continue;
}
transpose_sid(sid, label, offset, func_len);
if (sid_exist(bgp, sid))
return false;
continue;
alloced = true;
break;
}
for (uint32_t i = 1; i < index_max; i++) {
label = i << shift_len;
if (label < MPLS_LABEL_UNRESERVED_MIN) {
if (debug)
zlog_debug(
"%s: skipped to allocate SRv6 SID (%pFX): Label (%u) is too small to use",
__func__, &chunk->prefix,
label);
continue;
}
transpose_sid(sid, label, offset, func_len);
if (sid_exist(bgp, sid))
continue;