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OSPFD: Fix Segment Routing Lan Adjacency TLVs

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- Lan Adjacency TLVs was incorrectly formatted due to an error in
TLV size computation. Add new macro to fix this issue
 - Update SR link nexthop when it corresponds to an LAN Adj SID. The nexthop
is set to the router id in the TLVi (as per draft), but we need the neighbor
IP address to set the corresponding MPLS LFIB entry

Signed-off-by: Olivier Dugeon <olivier.dugeon@orange.com>
This commit is contained in:
Olivier Dugeon 2018-02-19 10:17:41 +01:00
parent 97133f7f9f
commit d922605d28
3 changed files with 26 additions and 14 deletions
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29
ospfd/ospf_ext.c
View File

@ -334,10 +334,12 @@ static void set_prefix_sid(struct ext_itf *exti, uint8_t algorithm,
/* Set Label or Index value */
if (value_type == SID_LABEL) {
TLV_LEN(exti->node_sid) = htons(SID_LABEL_SIZE);
TLV_LEN(exti->node_sid) =
htons(SID_LABEL_SIZE(EXT_SUBTLV_PREFIX_SID_SIZE));
exti->node_sid.value = htonl(SET_LABEL(value));
} else {
TLV_LEN(exti->node_sid) = htons(SID_INDEX_SIZE);
TLV_LEN(exti->node_sid) =
htons(SID_INDEX_SIZE(EXT_SUBTLV_PREFIX_SID_SIZE));
exti->node_sid.value = htonl(value);
}
@ -370,11 +372,13 @@ static void set_adj_sid(struct ext_itf *exti, bool backup, uint32_t value,
/* Adjust Length, Flags and Value depending on the type of Label */
if (value_type == SID_LABEL) {
SET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG);
TLV_LEN(exti->adj_sid[index]) = htons(SID_LABEL_SIZE);
TLV_LEN(exti->adj_sid[index]) =
htons(SID_LABEL_SIZE(EXT_SUBTLV_ADJ_SID_SIZE));
exti->adj_sid[index].value = htonl(SET_LABEL(value));
} else {
UNSET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG);
TLV_LEN(exti->adj_sid[index]) = htons(SID_INDEX_SIZE);
TLV_LEN(exti->adj_sid[index]) =
htons(SID_INDEX_SIZE(EXT_SUBTLV_ADJ_SID_SIZE));
exti->adj_sid[index].value = htonl(value);
}
@ -402,7 +406,7 @@ static void set_lan_adj_sid(struct ext_itf *exti, bool backup, uint32_t value,
}
/* Set Header */
TLV_TYPE(exti->lan_sid[index]) = htons(EXT_SUBTLV_ADJ_SID);
TLV_TYPE(exti->lan_sid[index]) = htons(EXT_SUBTLV_LAN_ADJ_SID);
/* Only Local ADJ-SID is supported for the moment */
SET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_LFLG);
@ -410,11 +414,13 @@ static void set_lan_adj_sid(struct ext_itf *exti, bool backup, uint32_t value,
/* Adjust Length, Flags and Value depending on the type of Label */
if (value_type == SID_LABEL) {
SET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG);
TLV_LEN(exti->lan_sid[index]) = htons(SID_LABEL_SIZE);
TLV_LEN(exti->lan_sid[index]) =
htons(SID_LABEL_SIZE(EXT_SUBTLV_PREFIX_RANGE_SIZE));
exti->lan_sid[index].value = htonl(SET_LABEL(value));
} else {
UNSET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG);
TLV_LEN(exti->lan_sid[index]) = htons(SID_INDEX_SIZE);
TLV_LEN(exti->lan_sid[index]) =
htons(SID_INDEX_SIZE(EXT_SUBTLV_PREFIX_RANGE_SIZE));
exti->lan_sid[index].value = htonl(value);
}
@ -906,7 +912,7 @@ static void ospf_ext_link_lsa_body_set(struct stream *s, struct ext_itf *exti)
/* Build LSA body for an Extended Link TLV with Adj. SID */
build_tlv_header(s, &exti->link.header);
stream_put(s, TLV_DATA(&exti->link.header), EXT_TLV_LINK_SIZE);
/* then add Ajacency SubTLVs */
/* then add Adjacency SubTLVs */
build_tlv(s, &exti->adj_sid[1].header);
build_tlv(s, &exti->adj_sid[0].header);
@ -921,8 +927,8 @@ static void ospf_ext_link_lsa_body_set(struct stream *s, struct ext_itf *exti)
/* Build LSA body for an Extended Link TLV with LAN SID */
build_tlv_header(s, &exti->link.header);
stream_put(s, &exti->link.header, EXT_TLV_LINK_SIZE);
/* then add LAN-Ajacency SubTLVs */
stream_put(s, TLV_DATA(&exti->link.header), EXT_TLV_LINK_SIZE);
/* then add LAN-Adjacency SubTLVs */
build_tlv(s, &exti->lan_sid[1].header);
build_tlv(s, &exti->lan_sid[0].header);
}
@ -1671,8 +1677,9 @@ static uint16_t show_vty_ext_link_lan_adj_sid(struct vty *vty,
vty_out(vty,
" LAN-Adj-SID Sub-TLV: Length %u\n\tFlags: "
"0x%x\n\tMT-ID:0x%x\n\tWeight: 0x%x\n\tNeighbor ID: "
"%s\n\tLabel: %u\n",
"%s\n\t%s: %u\n",
ntohs(top->header.length), top->flags, top->mtid, top->weight,
inet_ntoa(top->neighbor_id),
CHECK_FLAG(top->flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG) ? "Label"
: "Index",
CHECK_FLAG(top->flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG)

6
ospfd/ospf_sr.c
View File

@ -491,6 +491,12 @@ static int compute_link_nhlfe(struct sr_link *srl)
srl->nhlfe[0].ifindex = nh->oi->ifp->ifindex;
srl->nhlfe[1].ifindex = nh->oi->ifp->ifindex;
/* Update neighbor address for LAN_ADJ_SID */
if (srl->type == LAN_ADJ_SID) {
IPV4_ADDR_COPY(&srl->nhlfe[0].nexthop, &nh->src);
IPV4_ADDR_COPY(&srl->nhlfe[1].nexthop, &nh->src);
}
/* Set Input & Output Label */
if (CHECK_FLAG(srl->flags[0], EXT_SUBTLV_LINK_ADJ_SID_VFLG))
srl->nhlfe[0].label_in = srl->sid[0];

5
ospfd/ospf_sr.h
View File

@ -49,11 +49,10 @@
/* Segment Routing TLVs as per draft-ietf-ospf-segment-routing-extensions-19 */
/* Segment ID could be a Label (3 bytes) or an Index (4 bytes) */
#define SID_BASE_SIZE 4
#define SID_LABEL 3
#define SID_LABEL_SIZE (SID_BASE_SIZE + SID_LABEL)
#define SID_LABEL_SIZE(U) (U - 1)
#define SID_INDEX 4
#define SID_INDEX_SIZE (SID_BASE_SIZE + SID_INDEX)
#define SID_INDEX_SIZE(U) (U)
/* SID/Label Sub TLV - section 2.1 */
#define SUBTLV_SID_LABEL 1