OSPFD: Fix Segment Routing Lan Adjacency TLVs

 - 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>

diff --git a/ospfd/ospf_ext.c b/ospfd/ospf_ext.c
index d7faf4b0de5ceff253f2579a83c0c087fcdd501e..95835cfd0b462e35b645ca512b621c59f372f850 100644 (file)
--- a/ospfd/ospf_ext.c
+++ b/ospfd/ospf_ext.c
@@ -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)

diff --git a/ospfd/ospf_sr.c b/ospfd/ospf_sr.c
index 9827eac71b0ff78da64f96a120cb2dd669a4aee1..1560977ae86bfece3fb1f21651e88302ea1ada3e 100644 (file)
--- a/ospfd/ospf_sr.c
+++ b/ospfd/ospf_sr.c
@@ -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];

diff --git a/ospfd/ospf_sr.h b/ospfd/ospf_sr.h
index cb7d0833ec36346fd5604f1bef644c232aac7cc1..4d3f5f441a902c0587d6f639e29c14bd9a461532 100644 (file)
--- a/ospfd/ospf_sr.h
+++ b/ospfd/ospf_sr.h
@@ -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