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isisd: Add unpack func for SRv6 End SID Sub-TLV

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Add a function to unpack an SRv6 End SID Sub-TLV
(RFC 9352 section FRRouting#7.2).

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
This commit is contained in:
Carmine Scarpitta 2023-02-21 19:47:03 +01:00
parent b38fed40a1
commit 71b8756f80
1 changed files with 55 additions and 0 deletions
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55
isisd/isis_tlvs.c
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@ -2120,6 +2120,61 @@ static int pack_item_srv6_end_sid(struct isis_item *i, struct stream *s,
return 0;
}
static int unpack_item_srv6_end_sid(uint16_t mtid, uint8_t len,
struct stream *s, struct sbuf *log,
void *dest, int indent)
{
struct isis_subtlvs *subtlvs = dest;
struct isis_srv6_end_sid_subtlv *sid;
size_t consume;
uint8_t subsubtlv_len;
sbuf_push(log, indent, "Unpacking SRv6 End SID...\n");
consume = 19;
if (len < consume) {
sbuf_push(
log, indent,
"Not enough data left. (expected 19 or more bytes, got %hhu)\n",
len);
return 1;
}
sid = XCALLOC(MTYPE_ISIS_SUBTLV, sizeof(*sid));
sid->flags = stream_getc(s);
sid->behavior = stream_getw(s);
stream_get(&sid->sid, s, IPV6_MAX_BYTELEN);
format_item_srv6_end_sid(mtid, (struct isis_item *)sid, log, NULL,
indent + 2);
/* Process Sub-Sub-TLVs */
consume += 1;
if (len < consume) {
sbuf_push(
log, indent,
"Expected 1 byte of Sub-Sub-TLV len, but no more data persent.\n");
goto out;
}
subsubtlv_len = stream_getc(s);
consume += subsubtlv_len;
if (len < consume) {
sbuf_push(log, indent,
"Expected %hhu bytes of Sub-Sub-TLVs, but only %u bytes available.\n",
subsubtlv_len, len - ((uint8_t)consume - subsubtlv_len));
goto out;
}
append_item(&subtlvs->srv6_end_sids, (struct isis_item *)sid);
return 0;
out:
if (sid)
free_item_srv6_end_sid((struct isis_item *)sid);
return 1;
}
/* Functions related to TLVs 1 Area Addresses */
static struct isis_item *copy_item_area_address(struct isis_item *i)