diff options
author | John Lo <loj@cisco.com> | 2016-12-08 16:10:02 -0500 |
---|---|---|
committer | Damjan Marion <dmarion.lists@gmail.com> | 2016-12-09 09:00:11 +0000 |
commit | 56912c896ae803fad01af390ade921be68ea5ba2 (patch) | |
tree | ef05ce91055c3304e1d8c27d4091ffe1f32d93a9 /vnet/vnet/vxlan/vxlan.c | |
parent | 6d403a013276f095e542c9b6281db96354fa6f07 (diff) |
Add extra validation for VXLAN packets and tunnels
- On VXLAN packet decap, validate its DIP against VXLAN tunnel.
- Add extra logic to validate and handle creation of multicast
VXLAN tunnels.
Change-Id: I6abdddd7be4cd9f1bcfc88d9970ba681fdd72f7c
Signed-off-by: John Lo <loj@cisco.com>
Diffstat (limited to 'vnet/vnet/vxlan/vxlan.c')
-rw-r--r-- | vnet/vnet/vxlan/vxlan.c | 141 |
1 files changed, 87 insertions, 54 deletions
diff --git a/vnet/vnet/vxlan/vxlan.c b/vnet/vnet/vxlan/vxlan.c index a2b89208116..894cc3dcbf2 100644 --- a/vnet/vnet/vxlan/vxlan.c +++ b/vnet/vnet/vxlan/vxlan.c @@ -49,7 +49,7 @@ static u8 * format_decap_next (u8 * s, va_list * args) case VXLAN_INPUT_NEXT_L2_INPUT: return format (s, "l2"); default: - return format (s, "next-index %d", next_index); + return format (s, "index %d", next_index); } return s; } @@ -59,14 +59,18 @@ u8 * format_vxlan_tunnel (u8 * s, va_list * args) vxlan_tunnel_t * t = va_arg (*args, vxlan_tunnel_t *); vxlan_main_t * ngm = &vxlan_main; - s = format (s, - "[%d] src %U dst %U vni %d encap_fib_index %d sw_if_index %d " - "fib_entry_index %d", + s = format (s, "[%d] src %U dst %U vni %d sw_if_index %d ", t - ngm->tunnels, format_ip46_address, &t->src, IP46_TYPE_ANY, format_ip46_address, &t->dst, IP46_TYPE_ANY, - t->vni, t->encap_fib_index, t->sw_if_index, t->fib_entry_index); - s = format (s, " decap_next %U\n", format_decap_next, t->decap_next_index); + t->vni, t->sw_if_index); + + if (ip46_address_is_multicast (&t->dst)) + s = format (s, "mcast_sw_if_index %d ", t->mcast_sw_if_index); + + s = format (s, "encap_fib_index %d fib_entry_index %d decap_next %U\n", + t->encap_fib_index, t->fib_entry_index, + format_decap_next, t->decap_next_index); return s; } @@ -300,20 +304,24 @@ int vnet_vxlan_add_del_tunnel vxlan6_tunnel_key_t key6; u32 is_ip6 = a->is_ip6; - if (!is_ip6) { - key4.src = a->dst.ip4.as_u32; /* decap src in key is encap dst in config */ - key4.vni = clib_host_to_net_u32 (a->vni << 8); - - p = hash_get (vxm->vxlan4_tunnel_by_key, key4.as_u64); - pvtep = hash_get (vxm->vtep4, a->src.ip4.as_u32); - } else { - key6.src.as_u64[0] = a->dst.ip6.as_u64[0]; - key6.src.as_u64[1] = a->dst.ip6.as_u64[1]; - key6.vni = clib_host_to_net_u32 (a->vni << 8); - - p = hash_get_mem (vxm->vxlan6_tunnel_by_key, &key6); - pvtep = NULL; /* ip6 vxlan-bypass not yet implemented */ - } + if (!is_ip6) + { + key4.src = a->dst.ip4.as_u32; /* decap src in key is encap dst in config */ + key4.vni = clib_host_to_net_u32 (a->vni << 8); + p = hash_get (vxm->vxlan4_tunnel_by_key, key4.as_u64); + if (ip4_address_is_multicast (&a->dst.ip4)) + pvtep = hash_get (vxm->vtep4, a->dst.ip4.as_u32); + else + pvtep = hash_get (vxm->vtep4, a->src.ip4.as_u32); + } + else + { + key6.src.as_u64[0] = a->dst.ip6.as_u64[0]; + key6.src.as_u64[1] = a->dst.ip6.as_u64[1]; + key6.vni = clib_host_to_net_u32 (a->vni << 8); + p = hash_get_mem (vxm->vxlan6_tunnel_by_key, &key6); + pvtep = NULL; /* ip6 vxlan-bypass not yet implemented */ + } if (a->is_add) { @@ -348,11 +356,10 @@ int vnet_vxlan_add_del_tunnel t->key4 = 0; /* not yet used */ } - if (!is_ip6) { + if (!is_ip6) rv = vxlan4_rewrite (t); - } else { - rv = vxlan6_rewrite (t); - } + else + rv = vxlan6_rewrite (t); if (rv) { @@ -363,8 +370,15 @@ int vnet_vxlan_add_del_tunnel if (!is_ip6) { hash_set (vxm->vxlan4_tunnel_by_key, key4.as_u64, t - vxm->tunnels); - if (pvtep) pvtep[0]++; - else hash_set (vxm->vtep4, a->src.ip4.as_u32, 1); + if (pvtep) + pvtep[0]++; + else + { + if (ip4_address_is_multicast (&a->dst.ip4)) + hash_set (vxm->vtep4, a->dst.ip4.as_u32, 1); + else + hash_set (vxm->vtep4, a->src.ip4.as_u32, 1); + } } else hash_set_mem (vxm->vxlan6_tunnel_by_key, t->key6, t - vxm->tunnels); @@ -419,8 +433,28 @@ int vnet_vxlan_add_del_tunnel vnet_flood_class_t flood_class = VNET_FLOOD_CLASS_TUNNEL_NORMAL; fib_prefix_from_ip46_addr(&t->dst, &tun_dst_pfx); - if (ip46_address_is_multicast(&t->dst)) - { + if (!ip46_address_is_multicast(&t->dst)) + { + /* Unicast tunnel - + * source the FIB entry for the tunnel's destination + * and become a child thereof. The tunnel will then get poked + * when the forwarding for the entry updates, and the tunnel can + * re-stack accordingly + */ + t->fib_entry_index = fib_table_entry_special_add + (t->encap_fib_index, &tun_dst_pfx, FIB_SOURCE_RR, + FIB_ENTRY_FLAG_NONE, ADJ_INDEX_INVALID); + t->sibling_index = fib_entry_child_add + (t->fib_entry_index, FIB_NODE_TYPE_VXLAN_TUNNEL, t - vxm->tunnels); + vxlan_tunnel_restack_dpo(t); + } + else if (pvtep == NULL) + { + /* Multicast tunnel - + * as the same mcast group can be used for mutiple mcast tunnels + * with different VNIs, create the output fib adjecency only if + * it does not already exist + */ fib_protocol_t fp; u8 mcast_mac[6]; if (!is_ip6) { @@ -446,21 +480,11 @@ int vnet_vxlan_add_del_tunnel /* Add local mcast adj. */ receive_dpo_add_or_lock(dproto, ~0, NULL, &dpo); t->fib_entry_index = fib_table_entry_special_dpo_add - (t->encap_fib_index, &tun_dst_pfx, FIB_SOURCE_SPECIAL, FIB_ENTRY_FLAG_NONE, &dpo); + (t->encap_fib_index, &tun_dst_pfx, + FIB_SOURCE_SPECIAL, FIB_ENTRY_FLAG_NONE, &dpo); dpo_reset(&dpo); - } else { - /* - * source the FIB entry for the tunnel's destination - * and become a child thereof. The tunnel will then get poked - * when the forwarding for the entry updates, and the tunnel can - * re-stack accordingly - */ - t->fib_entry_index = fib_table_entry_special_add - (t->encap_fib_index, &tun_dst_pfx, FIB_SOURCE_RR, FIB_ENTRY_FLAG_NONE, ADJ_INDEX_INVALID); - t->sibling_index = fib_entry_child_add - (t->fib_entry_index, FIB_NODE_TYPE_VXLAN_TUNNEL, t - vxm->tunnels); - vxlan_tunnel_restack_dpo(t); - } + } + /* Set vxlan tunnel output node */ hi->output_node_index = encap_index; @@ -481,17 +505,18 @@ int vnet_vxlan_add_del_tunnel vxm->tunnel_index_by_sw_if_index[t->sw_if_index] = ~0; - if (ip46_address_is_multicast(&t->dst)) - { - adj_unlock(t->mcast_adj_index); - fib_table_entry_delete_index(t->fib_entry_index, FIB_SOURCE_SPECIAL); - } - else - { - fib_entry_child_remove(t->fib_entry_index, t->sibling_index); - fib_table_entry_delete_index(t->fib_entry_index, FIB_SOURCE_RR); - } - fib_node_deinit(&t->node); + if (!ip46_address_is_multicast(&t->dst)) + { + fib_entry_child_remove(t->fib_entry_index, t->sibling_index); + fib_table_entry_delete_index(t->fib_entry_index, FIB_SOURCE_RR); + fib_node_deinit(&t->node); + } + else if (pvtep == NULL || pvtep[0] == 1) + { + adj_unlock(t->mcast_adj_index); + fib_table_entry_delete_index(t->fib_entry_index, FIB_SOURCE_SPECIAL); + fib_node_deinit(&t->node); + } if (!is_ip6) { @@ -500,7 +525,12 @@ int vnet_vxlan_add_del_tunnel { pvtep[0]--; if (pvtep[0] == 0) - hash_unset (vxm->vtep4, a->src.ip4.as_u32); + { + if (ip4_address_is_multicast (&a->dst.ip4)) + hash_unset (vxm->vtep4, a->dst.ip4.as_u32); + else + hash_unset (vxm->vtep4, a->src.ip4.as_u32); + } } } else @@ -688,6 +718,9 @@ vxlan_add_del_tunnel_command_fn (vlib_main_t * vm, if (grp_set && !ip46_address_is_multicast(&dst)) return clib_error_return (0, "tunnel group address not multicast"); + if (grp_set == 0 && ip46_address_is_multicast(&dst)) + return clib_error_return (0, "dst address must be unicast"); + if (grp_set && mcast_sw_if_index == ~0) return clib_error_return (0, "tunnel nonexistent multicast device"); |