wireguard: fix crash by not sending arp via wg interface

Type: fix

Currently, neighbor adjacencies on a wg interface are converted into a
midchain only if one of the peers has a matching allowed prefix
configured. If create a route that goes through a wg interface but the
next-hop address does not match any allowed prefixes, an ARP/ND request
will try to be sent via the wg interface to resolve the next-hop address
when matching traffic occurs. And sending an ARP request will cause VPP
to crash while copying hardware address of the wg interface which is
NULL. Sending an ND message will not cause VPP to crash but the error
logged will be unclear (no source address).

With this fix, convert all neighbor adjacencies on a wg interface into a
midchain and update tests to cover the case. If there is no matching
allowed prefix configured, traffic going such routes will be dropped
because of "Peer error". No changes if there is matching allowed prefix
configured.

Also, fix getting peer by adjacency index.

Signed-off-by: Alexander Chernavin <achernavin@netgate.com>
Change-Id: I15bc1e1f83de719e97edf3f7210a5359a35bddbd

2 files changed, 9 insertions, 1 deletions

diff --git a/src/plugins/wireguard/wireguard_if.c b/src/plugins/wireguard/wireguard_if.c
index ab37d086492..fd123471a8c 100644
--- a/src/plugins/wireguard/wireguard_if.c
+++ b/src/plugins/wireguard/wireguard_if.c
@@ -153,6 +153,14 @@ wg_if_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
 {
   index_t wgii;
 
+  /* Convert any neighbour adjacency that has a next-hop reachable through
+   * the wg interface into a midchain. This is to avoid sending ARP/ND to
+   * resolve the next-hop address via the wg interface. Then, if one of the
+   * peers has matching prefix among allowed prefixes, the midchain will be
+   * updated to the corresponding one.
+   */
+  adj_nbr_midchain_update_rewrite (ai, NULL, NULL, ADJ_FLAG_NONE, NULL);
+
   wgii = wg_if_find_by_sw_if_index (sw_if_index);
   wg_if_peer_walk (wg_if_get (wgii), wg_peer_if_adj_change, &ai);
 }
diff --git a/src/plugins/wireguard/wireguard_peer.h b/src/plugins/wireguard/wireguard_peer.h
index f3d80fbf9fe..a14f2692b1c 100644
--- a/src/plugins/wireguard/wireguard_peer.h
+++ b/src/plugins/wireguard/wireguard_peer.h
@@ -166,7 +166,7 @@ wg_peer_get (index_t peeri)
 static inline index_t
 wg_peer_get_by_adj_index (index_t ai)
 {
-  if (ai > vec_len (wg_peer_by_adj_index))
+  if (ai >= vec_len (wg_peer_by_adj_index))
     return INDEX_INVALID;
   return (wg_peer_by_adj_index[ai]);
 }