diff --git a/bgpd/bgp_nht.c b/bgpd/bgp_nht.c index aefcaeff3a20..a74b5f91ac08 100644 --- a/bgpd/bgp_nht.c +++ b/bgpd/bgp_nht.c @@ -146,6 +146,11 @@ int bgp_find_or_add_nexthop(struct bgp *bgp_route, struct bgp *bgp_nexthop, afi = BGP_ATTR_NEXTHOP_AFI_IP6(pi->attr) ? AFI_IP6 : AFI_IP; + /* Validation for the ipv4 mapped ipv6 nexthop. */ + if (IS_MAPPED_IPV6(&pi->attr->mp_nexthop_global)) { + afi = AFI_IP; + } + /* This will return true if the global IPv6 NH is a link local * addr */ if (make_prefix(afi, pi, &p) < 0) @@ -533,6 +538,7 @@ static int make_prefix(int afi, struct bgp_path_info *pi, struct prefix *p) : 0; struct bgp_dest *net = pi->net; const struct prefix *p_orig = bgp_dest_get_prefix(net); + struct in_addr ipv4; if (p_orig->family == AF_FLOWSPEC) { if (!pi->peer) @@ -548,8 +554,15 @@ static int make_prefix(int afi, struct bgp_path_info *pi, struct prefix *p) p->u.prefix4 = p_orig->u.prefix4; p->prefixlen = p_orig->prefixlen; } else { - p->u.prefix4 = pi->attr->nexthop; - p->prefixlen = IPV4_MAX_BITLEN; + if (IS_MAPPED_IPV6(&pi->attr->mp_nexthop_global)) { + ipv4_mapped_ipv6_to_ipv4( + &pi->attr->mp_nexthop_global, &ipv4); + p->u.prefix4 = ipv4; + p->prefixlen = IPV4_MAX_BITLEN; + } else { + p->u.prefix4 = pi->attr->nexthop; + p->prefixlen = IPV4_MAX_BITLEN; + } } break; case AFI_IP6: diff --git a/bgpd/bgp_updgrp_packet.c b/bgpd/bgp_updgrp_packet.c index 4de5ec3b04ff..684b4b7cd406 100644 --- a/bgpd/bgp_updgrp_packet.c +++ b/bgpd/bgp_updgrp_packet.c @@ -574,6 +574,18 @@ struct stream *bpacket_reformat_for_peer(struct bpacket *pkt, gnh_modified = 1; } + if (IN6_IS_ADDR_UNSPECIFIED(mod_v6nhg)) { + if (peer->nexthop.v4.s_addr) { + ipv4_to_ipv4_mapped_ipv6(mod_v6nhg, + peer->nexthop.v4); + } + } + + if (IS_MAPPED_IPV6(&peer->nexthop.v6_global)) { + 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, diff --git a/lib/ipaddr.h b/lib/ipaddr.h index cd7f79a04ebc..e26523fdbaf6 100644 --- a/lib/ipaddr.h +++ b/lib/ipaddr.h @@ -93,6 +93,13 @@ static inline char *ipaddr2str(const struct ipaddr *ip, char *buf, int size) return buf; } +#define IS_MAPPED_IPV6(A) \ + ((A)->s6_addr32[0] == 0x00000000 \ + ? ((A)->s6_addr32[1] == 0x00000000 \ + ? (ntohl((A)->s6_addr32[2]) == 0xFFFF ? 1 : 0) \ + : 0) \ + : 0) + /* * Convert IPv4 address to IPv4-mapped IPv6 address which is of the * form ::FFFF: (RFC 4291). This IPv6 address can then diff --git a/zebra/rt_netlink.c b/zebra/rt_netlink.c index 07e8e37b8232..8d38b6defe1f 100644 --- a/zebra/rt_netlink.c +++ b/zebra/rt_netlink.c @@ -1051,14 +1051,17 @@ static bool _netlink_route_add_gateway_info(uint8_t route_family, bytelen + 2)) return false; } else { - if (gw_family == AF_INET) { - if (!nl_attr_put(nlmsg, req_size, RTA_GATEWAY, - &nexthop->gate.ipv4, bytelen)) - return false; - } else { - if (!nl_attr_put(nlmsg, req_size, RTA_GATEWAY, - &nexthop->gate.ipv6, bytelen)) - return false; + if (!(nexthop->rparent + && IS_MAPPED_IPV6(&nexthop->rparent->gate.ipv6))) { + if (gw_family == AF_INET) { + if (!nl_attr_put(nlmsg, req_size, RTA_GATEWAY, + &nexthop->gate.ipv4, bytelen)) + return false; + } else { + if (!nl_attr_put(nlmsg, req_size, RTA_GATEWAY, + &nexthop->gate.ipv6, bytelen)) + return false; + } } } diff --git a/zebra/zebra_fpm_netlink.c b/zebra/zebra_fpm_netlink.c index a18885ddb74e..5831093b5053 100644 --- a/zebra/zebra_fpm_netlink.c +++ b/zebra/zebra_fpm_netlink.c @@ -364,6 +364,7 @@ static int netlink_route_info_encode(struct netlink_route_info *ri, struct rtattr *nest, *inner_nest; struct rtnexthop *rtnh; struct vxlan_encap_info_t *vxlan; + struct in6_addr ipv6; struct { struct nlmsghdr n; @@ -423,8 +424,15 @@ static int netlink_route_info_encode(struct netlink_route_info *ri, nhi = &ri->nhs[0]; if (nhi->gateway) { - nl_attr_put(&req->n, in_buf_len, RTA_GATEWAY, - nhi->gateway, bytelen); + if (nhi->type == NEXTHOP_TYPE_IPV4_IFINDEX + && ri->af == AF_INET6) { + ipv4_to_ipv4_mapped_ipv6(&ipv6, + nhi->gateway->ipv4); + nl_attr_put(&req->n, in_buf_len, RTA_GATEWAY, + &ipv6, bytelen); + } else + nl_attr_put(&req->n, in_buf_len, RTA_GATEWAY, + nhi->gateway, bytelen); } if (nhi->if_index) { diff --git a/zebra/zebra_nhg.c b/zebra/zebra_nhg.c index c0580908444c..43bf74589651 100644 --- a/zebra/zebra_nhg.c +++ b/zebra/zebra_nhg.c @@ -1775,6 +1775,7 @@ static int nexthop_active(afi_t afi, struct route_entry *re, struct interface *ifp; rib_dest_t *dest; struct zebra_vrf *zvrf; + struct in_addr ipv4; if ((nexthop->type == NEXTHOP_TYPE_IPV4) || nexthop->type == NEXTHOP_TYPE_IPV6) @@ -1835,13 +1836,23 @@ static int nexthop_active(afi_t afi, struct route_entry *re, return 0; } + /* Validation for ipv4 mapped ipv6 nexthop. */ + if (IS_MAPPED_IPV6(&nexthop->gate.ipv6)) { + afi = AFI_IP; + } + /* Make lookup prefix. */ memset(&p, 0, sizeof(struct prefix)); switch (afi) { case AFI_IP: p.family = AF_INET; p.prefixlen = IPV4_MAX_PREFIXLEN; - p.u.prefix4 = nexthop->gate.ipv4; + if (IS_MAPPED_IPV6(&nexthop->gate.ipv6)) { + ipv4_mapped_ipv6_to_ipv4(&nexthop->gate.ipv6, &ipv4); + p.u.prefix4 = ipv4; + } else { + p.u.prefix4 = nexthop->gate.ipv4; + } break; case AFI_IP6: p.family = AF_INET6;