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isisd: Pack Node MSD Sub-TLV for SRv6

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Extend Router Capabilities TLV pack function to pack Node MSD Sub-TLV
with the infomation relevant for SRv6 (RFC 9352 section #4).

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
This commit is contained in:
Carmine Scarpitta 2023-02-02 10:42:45 +01:00
parent 8d00f272f6
commit 15abfb1239
1 changed files with 53 additions and 0 deletions
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53
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;
uint8_t nb_algo;
size_t subtlv_len, subtlv_len_pos;
bool sr_algo_subtlv_present = false;
if (!router_cap)
@ -4391,6 +4392,58 @@ static int pack_tlv_router_cap(const struct isis_router_cap *router_cap,
router_cap->algo[i]);
}
}
/* And finish with MSDs if set as per RFC 9352 section #4 */
if (router_cap->srv6_msd.max_seg_left_msd +
router_cap->srv6_msd.max_end_pop_msd +
router_cap->srv6_msd.max_h_encaps_msd +
router_cap->srv6_msd.max_end_d_msd !=
0) {
stream_putc(s, ISIS_SUBTLV_NODE_MSD);
subtlv_len_pos = stream_get_endp(s);
/* Put 0 as Sub-TLV length for now, real length will be
* adjusted later */
stream_putc(s, 0);
/* RFC 9352 section #4.1 */
if (router_cap->srv6_msd.max_seg_left_msd != 0) {
stream_putc(s, ISIS_SUBTLV_SRV6_MAX_SL_MSD);
stream_putc(
s,
router_cap->srv6_msd.max_seg_left_msd);
}
/* RFC 9352 section #4.2 */
if (router_cap->srv6_msd.max_end_pop_msd != 0) {
stream_putc(s,
ISIS_SUBTLV_SRV6_MAX_END_POP_MSD);
stream_putc(
s,
router_cap->srv6_msd.max_end_pop_msd);
}
/* RFC 9352 section #4.3 */
if (router_cap->srv6_msd.max_h_encaps_msd != 0) {
stream_putc(s,
ISIS_SUBTLV_SRV6_MAX_H_ENCAPS_MSD);
stream_putc(
s,
router_cap->srv6_msd.max_h_encaps_msd);
}
/* RFC 9352 section #4.4 */
if (router_cap->srv6_msd.max_end_d_msd != 0) {
stream_putc(s, ISIS_SUBTLV_SRV6_MAX_END_D_MSD);
stream_putc(s,
router_cap->srv6_msd.max_end_d_msd);
}
/* Adjust Node MSD Sub-TLV length which depends on MSDs
* presence */
subtlv_len = stream_get_endp(s) - subtlv_len_pos - 1;
stream_putc_at(s, subtlv_len_pos, subtlv_len);
}
}
/* Adjust TLV length which depends on subTLVs presence */