ipsec: huge anti-replay window support

Type: improvement

Since RFC4303 does not specify the anti-replay window size, VPP should
support multiple window size. It is done through a clib_bitmap.

Signed-off-by: Maxime Peim <mpeim@cisco.com>
Change-Id: I3dfe30efd20018e345418bef298ec7cec19b1cfc

1 files changed, 179 insertions, 17 deletions

diff --git a/src/vnet/ipsec/ipsec_api.c b/src/vnet/ipsec/ipsec_api.c
index 7fc68f60369..6e7308ddf75 100644
--- a/src/vnet/ipsec/ipsec_api.c
+++ b/src/vnet/ipsec/ipsec_api.c
@@ -382,10 +382,10 @@ static void vl_api_ipsec_sad_entry_add_del_t_handler
   ip_address_decode2 (&mp->entry.tunnel_src, &tun.t_src);
   ip_address_decode2 (&mp->entry.tunnel_dst, &tun.t_dst);
 
-  rv = ipsec_sa_add_and_lock (id, spi, proto, crypto_alg, &crypto_key,
-			      integ_alg, &integ_key, flags, mp->entry.salt,
-			      htons (mp->entry.udp_src_port),
-			      htons (mp->entry.udp_dst_port), &tun, &sa_index);
+  rv = ipsec_sa_add_and_lock (
+    id, spi, proto, crypto_alg, &crypto_key, integ_alg, &integ_key, flags,
+    mp->entry.salt, htons (mp->entry.udp_src_port),
+    htons (mp->entry.udp_dst_port), 0, &tun, &sa_index);
 
 out:
   /* *INDENT-OFF* */
@@ -456,10 +456,10 @@ static void vl_api_ipsec_sad_entry_add_del_v2_t_handler
   ip_address_decode2 (&mp->entry.tunnel_src, &tun.t_src);
   ip_address_decode2 (&mp->entry.tunnel_dst, &tun.t_dst);
 
-    rv = ipsec_sa_add_and_lock (
-      id, spi, proto, crypto_alg, &crypto_key, integ_alg, &integ_key, flags,
-      mp->entry.salt, htons (mp->entry.udp_src_port),
-      htons (mp->entry.udp_dst_port), &tun, &sa_index);
+  rv = ipsec_sa_add_and_lock (
+    id, spi, proto, crypto_alg, &crypto_key, integ_alg, &integ_key, flags,
+    mp->entry.salt, htons (mp->entry.udp_src_port),
+    htons (mp->entry.udp_dst_port), 0, &tun, &sa_index);
 
 out:
   /* *INDENT-OFF* */
@@ -514,10 +514,10 @@ ipsec_sad_entry_add_v3 (const vl_api_ipsec_sad_entry_v3_t *entry,
   ipsec_key_decode (&entry->crypto_key, &crypto_key);
   ipsec_key_decode (&entry->integrity_key, &integ_key);
 
-  return ipsec_sa_add_and_lock (id, spi, proto, crypto_alg, &crypto_key,
-				integ_alg, &integ_key, flags, entry->salt,
-				htons (entry->udp_src_port),
-				htons (entry->udp_dst_port), &tun, sa_index);
+  return ipsec_sa_add_and_lock (
+    id, spi, proto, crypto_alg, &crypto_key, integ_alg, &integ_key, flags,
+    entry->salt, htons (entry->udp_src_port), htons (entry->udp_dst_port), 0,
+    &tun, sa_index);
 }
 
 static void
@@ -543,6 +543,56 @@ vl_api_ipsec_sad_entry_add_del_v3_t_handler (
 		{ rmp->stat_index = htonl (sa_index); });
 }
 
+static int
+ipsec_sad_entry_add_v4 (const vl_api_ipsec_sad_entry_v4_t *entry,
+			u32 *sa_index)
+{
+  ipsec_key_t crypto_key, integ_key;
+  ipsec_crypto_alg_t crypto_alg;
+  ipsec_integ_alg_t integ_alg;
+  ipsec_protocol_t proto;
+  ipsec_sa_flags_t flags;
+  u32 id, spi;
+  tunnel_t tun = { 0 };
+  int rv;
+
+  id = ntohl (entry->sad_id);
+  spi = ntohl (entry->spi);
+
+  rv = ipsec_proto_decode (entry->protocol, &proto);
+
+  if (rv)
+    return rv;
+
+  rv = ipsec_crypto_algo_decode (entry->crypto_algorithm, &crypto_alg);
+
+  if (rv)
+    return rv;
+
+  rv = ipsec_integ_algo_decode (entry->integrity_algorithm, &integ_alg);
+
+  if (rv)
+    return rv;
+
+  flags = ipsec_sa_flags_decode (entry->flags);
+
+  if (flags & IPSEC_SA_FLAG_IS_TUNNEL)
+    {
+      rv = tunnel_decode (&entry->tunnel, &tun);
+
+      if (rv)
+	return rv;
+    }
+
+  ipsec_key_decode (&entry->crypto_key, &crypto_key);
+  ipsec_key_decode (&entry->integrity_key, &integ_key);
+
+  return ipsec_sa_add_and_lock (
+    id, spi, proto, crypto_alg, &crypto_key, integ_alg, &integ_key, flags,
+    entry->salt, htons (entry->udp_src_port), htons (entry->udp_dst_port),
+    ntohl (entry->anti_replay_window_size), &tun, sa_index);
+}
+
 static void
 vl_api_ipsec_sad_entry_del_t_handler (vl_api_ipsec_sad_entry_del_t *mp)
 {
@@ -568,6 +618,19 @@ vl_api_ipsec_sad_entry_add_t_handler (vl_api_ipsec_sad_entry_add_t *mp)
 }
 
 static void
+vl_api_ipsec_sad_entry_add_v2_t_handler (vl_api_ipsec_sad_entry_add_v2_t *mp)
+{
+  vl_api_ipsec_sad_entry_add_reply_t *rmp;
+  u32 sa_index = ~0;
+  int rv;
+
+  rv = ipsec_sad_entry_add_v4 (&mp->entry, &sa_index);
+
+  REPLY_MACRO2 (VL_API_IPSEC_SAD_ENTRY_ADD_V2_REPLY,
+		{ rmp->stat_index = htonl (sa_index); });
+}
+
+static void
 vl_api_ipsec_sad_entry_update_t_handler (vl_api_ipsec_sad_entry_update_t *mp)
 {
   vl_api_ipsec_sad_entry_update_reply_t *rmp;
@@ -953,7 +1016,10 @@ send_ipsec_sa_details (ipsec_sa_t * sa, void *arg)
       mp->last_seq_inbound |= (u64) (clib_host_to_net_u32 (sa->seq_hi));
     }
   if (ipsec_sa_is_set_USE_ANTI_REPLAY (sa))
-    mp->replay_window = clib_host_to_net_u64 (sa->replay_window);
+    {
+      mp->replay_window =
+	clib_host_to_net_u64 (ipsec_sa_anti_replay_get_64b_window (sa));
+    }
 
   mp->stat_index = clib_host_to_net_u32 (sa->stat_index);
 
@@ -1040,7 +1106,10 @@ send_ipsec_sa_v2_details (ipsec_sa_t * sa, void *arg)
       mp->last_seq_inbound |= (u64) (clib_host_to_net_u32 (sa->seq_hi));
     }
   if (ipsec_sa_is_set_USE_ANTI_REPLAY (sa))
-    mp->replay_window = clib_host_to_net_u64 (sa->replay_window);
+    {
+      mp->replay_window =
+	clib_host_to_net_u64 (ipsec_sa_anti_replay_get_64b_window (sa));
+    }
 
   mp->stat_index = clib_host_to_net_u32 (sa->stat_index);
 
@@ -1120,7 +1189,10 @@ send_ipsec_sa_v3_details (ipsec_sa_t *sa, void *arg)
       mp->last_seq_inbound |= (u64) (clib_host_to_net_u32 (sa->seq_hi));
     }
   if (ipsec_sa_is_set_USE_ANTI_REPLAY (sa))
-    mp->replay_window = clib_host_to_net_u64 (sa->replay_window);
+    {
+      mp->replay_window =
+	clib_host_to_net_u64 (ipsec_sa_anti_replay_get_64b_window (sa));
+    }
 
   mp->stat_index = clib_host_to_net_u32 (sa->stat_index);
 
@@ -1200,7 +1272,10 @@ send_ipsec_sa_v4_details (ipsec_sa_t *sa, void *arg)
       mp->last_seq_inbound |= (u64) (clib_host_to_net_u32 (sa->seq_hi));
     }
   if (ipsec_sa_is_set_USE_ANTI_REPLAY (sa))
-    mp->replay_window = clib_host_to_net_u64 (sa->replay_window);
+    {
+      mp->replay_window =
+	clib_host_to_net_u64 (ipsec_sa_anti_replay_get_64b_window (sa));
+    }
 
   mp->thread_index = clib_host_to_net_u32 (sa->thread_index);
   mp->stat_index = clib_host_to_net_u32 (sa->stat_index);
@@ -1227,8 +1302,95 @@ vl_api_ipsec_sa_v4_dump_t_handler (vl_api_ipsec_sa_v4_dump_t *mp)
   ipsec_sa_walk (send_ipsec_sa_v4_details, &ctx);
 }
 
+static walk_rc_t
+send_ipsec_sa_v5_details (ipsec_sa_t *sa, void *arg)
+{
+  ipsec_dump_walk_ctx_t *ctx = arg;
+  vl_api_ipsec_sa_v5_details_t *mp;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  clib_memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IPSEC_SA_V5_DETAILS);
+  mp->context = ctx->context;
+
+  mp->entry.sad_id = htonl (sa->id);
+  mp->entry.spi = htonl (sa->spi);
+  mp->entry.protocol = ipsec_proto_encode (sa->protocol);
+
+  mp->entry.crypto_algorithm = ipsec_crypto_algo_encode (sa->crypto_alg);
+  ipsec_key_encode (&sa->crypto_key, &mp->entry.crypto_key);
+
+  mp->entry.integrity_algorithm = ipsec_integ_algo_encode (sa->integ_alg);
+  ipsec_key_encode (&sa->integ_key, &mp->entry.integrity_key);
+
+  mp->entry.flags = ipsec_sad_flags_encode (sa);
+  mp->entry.salt = clib_host_to_net_u32 (sa->salt);
+
+  if (ipsec_sa_is_set_IS_PROTECT (sa))
+    {
+      ipsec_sa_dump_match_ctx_t ctx = {
+	.sai = sa - ipsec_sa_pool,
+	.sw_if_index = ~0,
+      };
+      ipsec_tun_protect_walk (ipsec_sa_dump_match_sa, &ctx);
+
+      mp->sw_if_index = htonl (ctx.sw_if_index);
+    }
+  else
+    mp->sw_if_index = ~0;
+
+  if (ipsec_sa_is_set_IS_TUNNEL (sa))
+    tunnel_encode (&sa->tunnel, &mp->entry.tunnel);
+
+  if (ipsec_sa_is_set_UDP_ENCAP (sa))
+    {
+      mp->entry.udp_src_port = sa->udp_hdr.src_port;
+      mp->entry.udp_dst_port = sa->udp_hdr.dst_port;
+    }
+
+  mp->seq_outbound = clib_host_to_net_u64 (((u64) sa->seq));
+  mp->last_seq_inbound = clib_host_to_net_u64 (((u64) sa->seq));
+  if (ipsec_sa_is_set_USE_ESN (sa))
+    {
+      mp->seq_outbound |= (u64) (clib_host_to_net_u32 (sa->seq_hi));
+      mp->last_seq_inbound |= (u64) (clib_host_to_net_u32 (sa->seq_hi));
+    }
+  if (ipsec_sa_is_set_USE_ANTI_REPLAY (sa))
+    {
+      mp->replay_window =
+	clib_host_to_net_u64 (ipsec_sa_anti_replay_get_64b_window (sa));
+
+      mp->entry.anti_replay_window_size =
+	clib_host_to_net_u32 (IPSEC_SA_ANTI_REPLAY_WINDOW_SIZE (sa));
+    }
+
+  mp->thread_index = clib_host_to_net_u32 (sa->thread_index);
+  mp->stat_index = clib_host_to_net_u32 (sa->stat_index);
+
+  vl_api_send_msg (ctx->reg, (u8 *) mp);
+
+  return (WALK_CONTINUE);
+}
+
+static void
+vl_api_ipsec_sa_v5_dump_t_handler (vl_api_ipsec_sa_v5_dump_t *mp)
+{
+  vl_api_registration_t *reg;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  ipsec_dump_walk_ctx_t ctx = {
+    .reg = reg,
+    .context = mp->context,
+  };
+
+  ipsec_sa_walk (send_ipsec_sa_v5_details, &ctx);
+}
+
 static void
-vl_api_ipsec_backend_dump_t_handler (vl_api_ipsec_backend_dump_t * mp)
+vl_api_ipsec_backend_dump_t_handler (vl_api_ipsec_backend_dump_t *mp)
 {
   vl_api_registration_t *rp;
   ipsec_main_t *im = &ipsec_main;