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isisd: Pack SR-Algorithm Sub-TLV for SRv6

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Extend Router Capabilities TLV pack function to pack SR-Algorithm
Sub-TLV with infomation relevant for SRv6 (RFC 9352 section #3).

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
This commit is contained in:
Carmine Scarpitta 2022-11-30 19:35:22 +01:00
parent b85ecd30a9
commit c8004f7fe7
1 changed files with 20 additions and 0 deletions
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20
isisd/isis_tlvs.c
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@ -4235,6 +4235,7 @@ static int pack_tlv_router_cap(const struct isis_router_cap *router_cap,
{ {
size_t tlv_len, len_pos; size_t tlv_len, len_pos;
uint8_t nb_algo; uint8_t nb_algo;
bool sr_algo_subtlv_present = false;
if (!router_cap) if (!router_cap)
return 0; return 0;
@ -4268,6 +4269,7 @@ static int pack_tlv_router_cap(const struct isis_router_cap *router_cap,
for (int i = 0; i < SR_ALGORITHM_COUNT; i++) for (int i = 0; i < SR_ALGORITHM_COUNT; i++)
if (router_cap->algo[i] != SR_ALGORITHM_UNSET) if (router_cap->algo[i] != SR_ALGORITHM_UNSET)
stream_putc(s, router_cap->algo[i]); stream_putc(s, router_cap->algo[i]);
sr_algo_subtlv_present = true;
} }
/* Local Block if defined as per RFC8667 section #3.3 */ /* Local Block if defined as per RFC8667 section #3.3 */
@ -4371,6 +4373,24 @@ static int pack_tlv_router_cap(const struct isis_router_cap *router_cap,
stream_putc(s, ISIS_SUBTLV_SRV6_CAPABILITIES); stream_putc(s, ISIS_SUBTLV_SRV6_CAPABILITIES);
stream_putc(s, ISIS_SUBTLV_SRV6_CAPABILITIES_SIZE); stream_putc(s, ISIS_SUBTLV_SRV6_CAPABILITIES_SIZE);
stream_putw(s, router_cap->srv6_cap.flags); stream_putw(s, router_cap->srv6_cap.flags);
/*
* Then add SR Algorithm if set and if we haven't already
* added it when we processed SR-MPLS related Sub-TLVs as
* per RFC 9352 section #3
*/
if (!sr_algo_subtlv_present) {
nb_algo = isis_tlvs_sr_algo_count(router_cap);
if (nb_algo > 0) {
stream_putc(s, ISIS_SUBTLV_ALGORITHM);
stream_putc(s, nb_algo);
for (int i = 0; i < SR_ALGORITHM_COUNT; i++)
if (router_cap->algo[i] !=
SR_ALGORITHM_UNSET)
stream_putc(s,
router_cap->algo[i]);
}
}
} }
/* Adjust TLV length which depends on subTLVs presence */ /* Adjust TLV length which depends on subTLVs presence */