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bgpd: update logic to allocate SRv6 locator

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For the later patches, this patch changes the behavior of alloc_new sid
so that bgpd record not only SID for VRF, but also Locator of SID.

Signed-off-by: Ryoga Saito <ryoga.saito@linecorp.com>
This commit is contained in:
Ryoga Saito 2022-02-25 13:40:28 +00:00
parent 41ff140670
commit 921c7e77b0
2 changed files with 18 additions and 8 deletions
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25
bgpd/bgp_mplsvpn.c
View File

@ -520,7 +520,7 @@ static bool sid_exist(struct bgp *bgp, const struct in6_addr *sid)
* else: try to allocate as auto-mode
*/
static uint32_t alloc_new_sid(struct bgp *bgp, uint32_t index,
struct in6_addr *sid)
struct in6_addr *sid_locator)
{
struct listnode *node;
struct prefix_ipv6 *chunk;
@ -528,10 +528,11 @@ static uint32_t alloc_new_sid(struct bgp *bgp, uint32_t index,
bool alloced = false;
int label = 0;
if (!bgp || !sid)
if (!bgp || !sid_locator)
return false;
for (ALL_LIST_ELEMENTS_RO(bgp->srv6_locator_chunks, node, chunk)) {
*sid_locator = chunk->prefix;
sid_buf = chunk->prefix;
if (index != 0) {
label = index << 12;
@ -556,7 +557,6 @@ static uint32_t alloc_new_sid(struct bgp *bgp, uint32_t index,
return 0;
sid_register(bgp, &sid_buf, bgp->srv6_locator_name);
*sid = sid_buf;
return label;
}
@ -564,7 +564,7 @@ void ensure_vrf_tovpn_sid(struct bgp *bgp_vpn, struct bgp *bgp_vrf, afi_t afi)
{
int debug = BGP_DEBUG(vpn, VPN_LEAK_FROM_VRF);
char buf[256];
struct in6_addr *sid;
struct in6_addr *tovpn_sid, *tovpn_sid_locator;
uint32_t tovpn_sid_index = 0, tovpn_sid_transpose_label;
bool tovpn_sid_auto = false;
@ -598,24 +598,33 @@ void ensure_vrf_tovpn_sid(struct bgp *bgp_vpn, struct bgp *bgp_vrf, afi_t afi)
return;
}
sid = XCALLOC(MTYPE_BGP_SRV6_SID, sizeof(struct in6_addr));
tovpn_sid_locator =
XCALLOC(MTYPE_BGP_SRV6_SID, sizeof(struct in6_addr));
tovpn_sid_transpose_label =
alloc_new_sid(bgp_vpn, tovpn_sid_index, sid);
alloc_new_sid(bgp_vpn, tovpn_sid_index, tovpn_sid_locator);
if (tovpn_sid_transpose_label == 0) {
zlog_debug("%s: not allocated new sid for vrf %s: afi %s",
__func__, bgp_vrf->name_pretty, afi2str(afi));
return;
}
tovpn_sid = XCALLOC(MTYPE_BGP_SRV6_SID, sizeof(struct in6_addr));
*tovpn_sid = *tovpn_sid_locator;
transpose_sid(tovpn_sid, tovpn_sid_transpose_label,
BGP_PREFIX_SID_SRV6_TRANSPOSITION_OFFSET,
BGP_PREFIX_SID_SRV6_TRANSPOSITION_LENGTH);
if (debug) {
inet_ntop(AF_INET6, sid, buf, sizeof(buf));
inet_ntop(AF_INET6, tovpn_sid, buf, sizeof(buf));
zlog_debug("%s: new sid %s allocated for vrf %s: afi %s",
__func__, buf, bgp_vrf->name_pretty,
afi2str(afi));
}
bgp_vrf->vpn_policy[afi].tovpn_sid = tovpn_sid;
bgp_vrf->vpn_policy[afi].tovpn_sid_locator = tovpn_sid_locator;
bgp_vrf->vpn_policy[afi].tovpn_sid_transpose_label =
tovpn_sid_transpose_label;
bgp_vrf->vpn_policy[afi].tovpn_sid = sid;
}
void transpose_sid(struct in6_addr *sid, uint32_t label, uint8_t offset,

1
bgpd/bgpd.h
View File

@ -234,6 +234,7 @@ struct vpn_policy {
*/
uint32_t tovpn_sid_index; /* unset => set to 0 */
struct in6_addr *tovpn_sid;
struct in6_addr *tovpn_sid_locator;
uint32_t tovpn_sid_transpose_label;
struct in6_addr *tovpn_zebra_vrf_sid_last_sent;
};