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bgpd: allocate SID according to Function length

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Allocate SID according to Function length to eliminate old SID
allocation limits (255).

Signed-off-by: Ryoga Saito <ryoga.saito@linecorp.com>
This commit is contained in:
Ryoga Saito 2022-09-20 18:19:13 +09:00
parent df237bd4f0
commit c4ab9fd927
2 changed files with 32 additions and 7 deletions
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37
bgpd/bgp_mplsvpn.c
View File

@ -527,34 +527,57 @@ static uint32_t alloc_new_sid(struct bgp *bgp, uint32_t index,
struct in6_addr *sid_locator,
struct in6_addr *sid)
{
int debug = BGP_DEBUG(vpn, VPN_LEAK_LABEL);
struct listnode *node;
struct srv6_locator_chunk *chunk;
bool alloced = false;
int label = 0;
uint8_t offset = 0;
uint8_t len = 0;
uint8_t func_len = 0, shift_len = 0;
uint32_t index_max = 0;
if (!bgp || !sid_locator || !sid)
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 (debug)
zlog_debug(
"%s: invalid SRv6 Locator chunk (%pFX): Function Length must be less or equal to %d",
__func__, &chunk->prefix,
BGP_PREFIX_SID_SRV6_MAX_FUNCTION_LENGTH);
continue;
}
index_max = (1 << chunk->function_bits_length) - 1;
if (index > index_max) {
if (debug)
zlog_debug(
"%s: skipped SRv6 Locator chunk (%pFX): Function Length is too short to support specified index (%u)",
__func__, &chunk->prefix, index);
continue;
}
*sid_locator = chunk->prefix.prefix;
*sid = chunk->prefix.prefix;
offset = chunk->block_bits_length + chunk->node_bits_length;
len = chunk->function_bits_length ?: 16;
func_len = chunk->function_bits_length;
shift_len = BGP_PREFIX_SID_SRV6_MAX_FUNCTION_LENGTH - func_len;
if (index != 0) {
label = index << 12;
transpose_sid(sid, label, offset, len);
label = index << shift_len;
transpose_sid(sid, label, offset, func_len);
if (sid_exist(bgp, sid))
return false;
alloced = true;
break;
}
for (size_t i = 1; i < 255; i++) {
label = i << 12;
transpose_sid(sid, label, offset, len);
for (uint32_t i = 1; i < index_max; i++) {
label = i << shift_len;
transpose_sid(sid, label, offset, func_len);
if (sid_exist(bgp, sid))
continue;
alloced = true;

2
bgpd/bgp_mplsvpn.h
View File

@ -41,6 +41,8 @@
#define V4_HEADER_OVERLAY \
" Network Next Hop EthTag Overlay Index RouterMac\n"
#define BGP_PREFIX_SID_SRV6_MAX_FUNCTION_LENGTH 20
extern void bgp_mplsvpn_init(void);
extern int bgp_nlri_parse_vpn(struct peer *, struct attr *, struct bgp_nlri *);
extern uint32_t decode_label(mpls_label_t *);