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bgpd: Reformat bpacket_reformat_for_peer
This function was heavily indented, reformat to reduce indentation levels a bit. Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp
parent
4b08a72ed1
commit
f041034e44
@ -397,253 +397,243 @@ struct stream *bpacket_reformat_for_peer(struct bpacket *pkt,
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peer = PAF_PEER(paf);
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vec = &pkt->arr.entries[BGP_ATTR_VEC_NH];
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if (CHECK_FLAG(vec->flags, BPKT_ATTRVEC_FLAGS_UPDATED)) {
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uint8_t nhlen;
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afi_t nhafi;
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int route_map_sets_nh;
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nhlen = stream_getc_from(s, vec->offset);
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filter = &peer->filter[paf->afi][paf->safi];
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if (peer_cap_enhe(peer, paf->afi, paf->safi))
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nhafi = AFI_IP6;
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else
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nhafi = BGP_NEXTHOP_AFI_FROM_NHLEN(nhlen);
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if (!CHECK_FLAG(vec->flags, BPKT_ATTRVEC_FLAGS_UPDATED))
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return s;
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if (nhafi == AFI_IP) {
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struct in_addr v4nh, *mod_v4nh;
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int nh_modified = 0;
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size_t offset_nh = vec->offset + 1;
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uint8_t nhlen;
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afi_t nhafi;
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int route_map_sets_nh;
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route_map_sets_nh =
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(CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_IPV4_NH_CHANGED)
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|| CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS));
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nhlen = stream_getc_from(s, vec->offset);
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filter = &peer->filter[paf->afi][paf->safi];
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switch (nhlen) {
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case BGP_ATTR_NHLEN_IPV4:
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break;
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case BGP_ATTR_NHLEN_VPNV4:
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offset_nh += 8;
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break;
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default:
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/* TODO: handle IPv6 nexthops */
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flog_warn(
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EC_BGP_INVALID_NEXTHOP_LENGTH,
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"%s: %s: invalid MP nexthop length (AFI IP): %u",
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__func__, peer->host, nhlen);
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stream_free(s);
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return NULL;
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}
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if (peer_cap_enhe(peer, paf->afi, paf->safi))
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nhafi = AFI_IP6;
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else
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nhafi = BGP_NEXTHOP_AFI_FROM_NHLEN(nhlen);
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stream_get_from(&v4nh, s, offset_nh, IPV4_MAX_BYTELEN);
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mod_v4nh = &v4nh;
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if (nhafi == AFI_IP) {
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struct in_addr v4nh, *mod_v4nh;
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int nh_modified = 0;
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size_t offset_nh = vec->offset + 1;
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/*
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* If route-map has set the nexthop, that is normally
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* used; if it is specified as peer-address, the peering
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* address is picked up. Otherwise, if NH is unavailable
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* from attribute, the peering addr is picked up; the
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* "NH unavailable" case also covers next-hop-self and
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* some other scenarios - see subgroup_announce_check().
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* In all other cases, use the nexthop carried in the
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* attribute unless it is EBGP non-multiaccess and there
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* is no next-hop-unchanged setting or the peer is EBGP
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* and the route-map that changed the next-hop value
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* was applied inbound rather than outbound. Updates to
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* an EBGP peer should only modify the next-hop if it
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* was set in an outbound route-map to that peer.
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* Note: It is assumed route-map cannot set the nexthop
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* to an invalid value.
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*/
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if (route_map_sets_nh
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&& ((peer->sort != BGP_PEER_EBGP)
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|| ROUTE_MAP_OUT(filter))) {
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if (CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)) {
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mod_v4nh = &peer->nexthop.v4;
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nh_modified = 1;
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}
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} else if (v4nh.s_addr == INADDR_ANY) {
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mod_v4nh = &peer->nexthop.v4;
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nh_modified = 1;
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} else if (peer->sort == BGP_PEER_EBGP
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&& (bgp_multiaccess_check_v4(v4nh, peer)
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== 0)
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&& !CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED)
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&& !peer_af_flag_check(
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peer, paf->afi, paf->safi,
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PEER_FLAG_NEXTHOP_UNCHANGED)) {
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/* NOTE: not handling case where NH has new AFI
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*/
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mod_v4nh = &peer->nexthop.v4;
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nh_modified = 1;
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}
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route_map_sets_nh =
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(CHECK_FLAG(vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_IPV4_NH_CHANGED)
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|| CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS));
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if (nh_modified) /* allow for VPN RD */
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stream_put_in_addr_at(s, offset_nh, mod_v4nh);
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if (bgp_debug_update(peer, NULL, NULL, 0))
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zlog_debug("u%" PRIu64 ":s%" PRIu64
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" %s send UPDATE w/ nexthop %s%s",
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PAF_SUBGRP(paf)->update_group->id,
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PAF_SUBGRP(paf)->id, peer->host,
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inet_ntoa(*mod_v4nh),
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(nhlen == 12 ? " and RD" : ""));
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} else if (nhafi == AFI_IP6) {
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struct in6_addr v6nhglobal, *mod_v6nhg;
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struct in6_addr v6nhlocal, *mod_v6nhl;
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int gnh_modified, lnh_modified;
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size_t offset_nhglobal = vec->offset + 1;
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size_t offset_nhlocal = vec->offset + 1;
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gnh_modified = lnh_modified = 0;
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mod_v6nhg = &v6nhglobal;
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mod_v6nhl = &v6nhlocal;
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route_map_sets_nh =
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(CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_IPV6_GNH_CHANGED)
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|| CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS));
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/*
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* The logic here is rather similar to that for IPv4,
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* the
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* additional work being to handle 1 or 2 nexthops.
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* Also, 3rd
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* party nexthop is not propagated for EBGP right now.
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*/
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switch (nhlen) {
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case BGP_ATTR_NHLEN_IPV6_GLOBAL:
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break;
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case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL:
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offset_nhlocal += IPV6_MAX_BYTELEN;
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break;
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case BGP_ATTR_NHLEN_VPNV6_GLOBAL:
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offset_nhglobal += 8;
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break;
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case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL:
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offset_nhglobal += 8;
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offset_nhlocal += 8 * 2 + IPV6_MAX_BYTELEN;
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break;
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default:
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/* TODO: handle IPv4 nexthops */
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flog_warn(
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EC_BGP_INVALID_NEXTHOP_LENGTH,
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"%s: %s: invalid MP nexthop length (AFI IP6): %u",
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__func__, peer->host, nhlen);
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stream_free(s);
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return NULL;
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}
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stream_get_from(&v6nhglobal, s, offset_nhglobal,
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IPV6_MAX_BYTELEN);
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/*
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* Updates to an EBGP peer should only modify the
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* next-hop if it was set in an outbound route-map
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* to that peer.
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*/
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if (route_map_sets_nh
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&& ((peer->sort != BGP_PEER_EBGP)
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|| ROUTE_MAP_OUT(filter))) {
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if (CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)) {
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mod_v6nhg = &peer->nexthop.v6_global;
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gnh_modified = 1;
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}
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} else if (IN6_IS_ADDR_UNSPECIFIED(&v6nhglobal)) {
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mod_v6nhg = &peer->nexthop.v6_global;
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gnh_modified = 1;
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} else if (
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(peer->sort == BGP_PEER_EBGP)
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&& (!bgp_multiaccess_check_v6(v6nhglobal, peer))
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&& !CHECK_FLAG(vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED)
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&& !peer_af_flag_check(
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peer, nhafi, paf->safi,
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PEER_FLAG_NEXTHOP_UNCHANGED)) {
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/* NOTE: not handling case where NH has new AFI
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*/
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mod_v6nhg = &peer->nexthop.v6_global;
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gnh_modified = 1;
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}
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if (nhlen == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
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|| nhlen == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) {
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stream_get_from(&v6nhlocal, s, offset_nhlocal,
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IPV6_MAX_BYTELEN);
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if (IN6_IS_ADDR_UNSPECIFIED(&v6nhlocal)) {
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mod_v6nhl = &peer->nexthop.v6_local;
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lnh_modified = 1;
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}
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}
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if (gnh_modified)
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stream_put_in6_addr_at(s, offset_nhglobal,
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mod_v6nhg);
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if (lnh_modified)
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stream_put_in6_addr_at(s, offset_nhlocal,
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mod_v6nhl);
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if (bgp_debug_update(peer, NULL, NULL, 0)) {
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if (nhlen == 32 || nhlen == 48)
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zlog_debug(
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"u%" PRIu64 ":s%" PRIu64
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" %s send UPDATE w/ mp_nexthops %s, %s%s",
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PAF_SUBGRP(paf)
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->update_group->id,
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PAF_SUBGRP(paf)->id, peer->host,
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inet_ntop(AF_INET6, mod_v6nhg,
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buf, BUFSIZ),
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inet_ntop(AF_INET6, mod_v6nhl,
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buf2, BUFSIZ),
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(nhlen == 48 ? " and RD" : ""));
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else
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zlog_debug(
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"u%" PRIu64 ":s%" PRIu64
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" %s send UPDATE w/ mp_nexthop %s%s",
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PAF_SUBGRP(paf)
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->update_group->id,
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PAF_SUBGRP(paf)->id, peer->host,
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inet_ntop(AF_INET6, mod_v6nhg,
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buf, BUFSIZ),
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(nhlen == 24 ? " and RD" : ""));
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}
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} else if (paf->afi == AFI_L2VPN) {
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struct in_addr v4nh, *mod_v4nh;
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int nh_modified = 0;
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stream_get_from(&v4nh, s, vec->offset + 1, 4);
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mod_v4nh = &v4nh;
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/* No route-map changes allowed for EVPN nexthops. */
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if (v4nh.s_addr == INADDR_ANY) {
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mod_v4nh = &peer->nexthop.v4;
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nh_modified = 1;
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}
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if (nh_modified)
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stream_put_in_addr_at(s, vec->offset + 1,
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mod_v4nh);
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if (bgp_debug_update(peer, NULL, NULL, 0))
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zlog_debug("u%" PRIu64 ":s%" PRIu64
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" %s send UPDATE w/ nexthop %s",
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PAF_SUBGRP(paf)->update_group->id,
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PAF_SUBGRP(paf)->id, peer->host,
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inet_ntoa(*mod_v4nh));
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switch (nhlen) {
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case BGP_ATTR_NHLEN_IPV4:
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break;
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case BGP_ATTR_NHLEN_VPNV4:
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offset_nh += 8;
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break;
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default:
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/* TODO: handle IPv6 nexthops */
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flog_warn(
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EC_BGP_INVALID_NEXTHOP_LENGTH,
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"%s: %s: invalid MP nexthop length (AFI IP): %u",
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__func__, peer->host, nhlen);
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stream_free(s);
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return NULL;
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}
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stream_get_from(&v4nh, s, offset_nh, IPV4_MAX_BYTELEN);
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mod_v4nh = &v4nh;
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/*
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* If route-map has set the nexthop, that is normally
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* used; if it is specified as peer-address, the peering
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* address is picked up. Otherwise, if NH is unavailable
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* from attribute, the peering addr is picked up; the
|
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* "NH unavailable" case also covers next-hop-self and
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* some other scenarios - see subgroup_announce_check().
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* In all other cases, use the nexthop carried in the
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* attribute unless it is EBGP non-multiaccess and there
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* is no next-hop-unchanged setting or the peer is EBGP
|
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* and the route-map that changed the next-hop value
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* was applied inbound rather than outbound. Updates to
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* an EBGP peer should only modify the next-hop if it
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* was set in an outbound route-map to that peer.
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* Note: It is assumed route-map cannot set the nexthop
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* to an invalid value.
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*/
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if (route_map_sets_nh
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&& ((peer->sort != BGP_PEER_EBGP)
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|| ROUTE_MAP_OUT(filter))) {
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if (CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)) {
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mod_v4nh = &peer->nexthop.v4;
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nh_modified = 1;
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}
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} else if (v4nh.s_addr == INADDR_ANY) {
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mod_v4nh = &peer->nexthop.v4;
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nh_modified = 1;
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} else if (peer->sort == BGP_PEER_EBGP
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&& (bgp_multiaccess_check_v4(v4nh, peer) == 0)
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&& !CHECK_FLAG(vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED)
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&& !peer_af_flag_check(
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peer, paf->afi, paf->safi,
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PEER_FLAG_NEXTHOP_UNCHANGED)) {
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/* NOTE: not handling case where NH has new AFI
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*/
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mod_v4nh = &peer->nexthop.v4;
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nh_modified = 1;
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}
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if (nh_modified) /* allow for VPN RD */
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stream_put_in_addr_at(s, offset_nh, mod_v4nh);
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if (bgp_debug_update(peer, NULL, NULL, 0))
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zlog_debug("u%" PRIu64 ":s%" PRIu64
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" %s send UPDATE w/ nexthop %s%s",
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PAF_SUBGRP(paf)->update_group->id,
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PAF_SUBGRP(paf)->id, peer->host,
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inet_ntoa(*mod_v4nh),
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(nhlen == 12 ? " and RD" : ""));
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} else if (nhafi == AFI_IP6) {
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struct in6_addr v6nhglobal, *mod_v6nhg;
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struct in6_addr v6nhlocal, *mod_v6nhl;
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int gnh_modified, lnh_modified;
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size_t offset_nhglobal = vec->offset + 1;
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size_t offset_nhlocal = vec->offset + 1;
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gnh_modified = lnh_modified = 0;
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mod_v6nhg = &v6nhglobal;
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mod_v6nhl = &v6nhlocal;
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route_map_sets_nh =
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(CHECK_FLAG(vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_IPV6_GNH_CHANGED)
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|| CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS));
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/*
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* The logic here is rather similar to that for IPv4, the
|
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* additional work being to handle 1 or 2 nexthops.
|
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* Also, 3rd party nexthop is not propagated for EBGP
|
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* right now.
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*/
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switch (nhlen) {
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case BGP_ATTR_NHLEN_IPV6_GLOBAL:
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break;
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case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL:
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offset_nhlocal += IPV6_MAX_BYTELEN;
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break;
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case BGP_ATTR_NHLEN_VPNV6_GLOBAL:
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offset_nhglobal += 8;
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break;
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case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL:
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offset_nhglobal += 8;
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offset_nhlocal += 8 * 2 + IPV6_MAX_BYTELEN;
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break;
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default:
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/* TODO: handle IPv4 nexthops */
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flog_warn(
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EC_BGP_INVALID_NEXTHOP_LENGTH,
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"%s: %s: invalid MP nexthop length (AFI IP6): %u",
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__func__, peer->host, nhlen);
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stream_free(s);
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return NULL;
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}
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stream_get_from(&v6nhglobal, s, offset_nhglobal,
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IPV6_MAX_BYTELEN);
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/*
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* Updates to an EBGP peer should only modify the
|
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* next-hop if it was set in an outbound route-map
|
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* to that peer.
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*/
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if (route_map_sets_nh
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&& ((peer->sort != BGP_PEER_EBGP)
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|| ROUTE_MAP_OUT(filter))) {
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if (CHECK_FLAG(
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vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_PEER_ADDRESS)) {
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mod_v6nhg = &peer->nexthop.v6_global;
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gnh_modified = 1;
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}
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} else if (IN6_IS_ADDR_UNSPECIFIED(&v6nhglobal)) {
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mod_v6nhg = &peer->nexthop.v6_global;
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gnh_modified = 1;
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} else if ((peer->sort == BGP_PEER_EBGP)
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&& (!bgp_multiaccess_check_v6(v6nhglobal, peer))
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&& !CHECK_FLAG(vec->flags,
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BPKT_ATTRVEC_FLAGS_RMAP_NH_UNCHANGED)
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&& !peer_af_flag_check(
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peer, nhafi, paf->safi,
|
||||
PEER_FLAG_NEXTHOP_UNCHANGED)) {
|
||||
/* NOTE: not handling case where NH has new AFI
|
||||
*/
|
||||
mod_v6nhg = &peer->nexthop.v6_global;
|
||||
gnh_modified = 1;
|
||||
}
|
||||
|
||||
if (nhlen == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL
|
||||
|| nhlen == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) {
|
||||
stream_get_from(&v6nhlocal, s, offset_nhlocal,
|
||||
IPV6_MAX_BYTELEN);
|
||||
if (IN6_IS_ADDR_UNSPECIFIED(&v6nhlocal)) {
|
||||
mod_v6nhl = &peer->nexthop.v6_local;
|
||||
lnh_modified = 1;
|
||||
}
|
||||
}
|
||||
|
||||
if (gnh_modified)
|
||||
stream_put_in6_addr_at(s, offset_nhglobal, mod_v6nhg);
|
||||
if (lnh_modified)
|
||||
stream_put_in6_addr_at(s, offset_nhlocal, mod_v6nhl);
|
||||
|
||||
if (bgp_debug_update(peer, NULL, NULL, 0)) {
|
||||
if (nhlen == 32 || nhlen == 48)
|
||||
zlog_debug(
|
||||
"u%" PRIu64 ":s%" PRIu64
|
||||
" %s send UPDATE w/ mp_nexthops %s, %s%s",
|
||||
PAF_SUBGRP(paf)->update_group->id,
|
||||
PAF_SUBGRP(paf)->id, peer->host,
|
||||
inet_ntop(AF_INET6, mod_v6nhg, buf,
|
||||
BUFSIZ),
|
||||
inet_ntop(AF_INET6, mod_v6nhl, buf2,
|
||||
BUFSIZ),
|
||||
(nhlen == 48 ? " and RD" : ""));
|
||||
else
|
||||
zlog_debug("u%" PRIu64 ":s%" PRIu64
|
||||
" %s send UPDATE w/ mp_nexthop %s%s",
|
||||
PAF_SUBGRP(paf)->update_group->id,
|
||||
PAF_SUBGRP(paf)->id, peer->host,
|
||||
inet_ntop(AF_INET6, mod_v6nhg, buf,
|
||||
BUFSIZ),
|
||||
(nhlen == 24 ? " and RD" : ""));
|
||||
}
|
||||
} else if (paf->afi == AFI_L2VPN) {
|
||||
struct in_addr v4nh, *mod_v4nh;
|
||||
int nh_modified = 0;
|
||||
|
||||
stream_get_from(&v4nh, s, vec->offset + 1, 4);
|
||||
mod_v4nh = &v4nh;
|
||||
|
||||
/* No route-map changes allowed for EVPN nexthops. */
|
||||
if (v4nh.s_addr == INADDR_ANY) {
|
||||
mod_v4nh = &peer->nexthop.v4;
|
||||
nh_modified = 1;
|
||||
}
|
||||
|
||||
if (nh_modified)
|
||||
stream_put_in_addr_at(s, vec->offset + 1, mod_v4nh);
|
||||
|
||||
if (bgp_debug_update(peer, NULL, NULL, 0))
|
||||
zlog_debug("u%" PRIu64 ":s%" PRIu64
|
||||
" %s send UPDATE w/ nexthop %s",
|
||||
PAF_SUBGRP(paf)->update_group->id,
|
||||
PAF_SUBGRP(paf)->id, peer->host,
|
||||
inet_ntoa(*mod_v4nh));
|
||||
}
|
||||
|
||||
return s;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user