X-Git-Url: https://gerrit.fd.io/r/gitweb?p=vpp.git;a=blobdiff_plain;f=src%2Fvnet%2Fipsec%2Fipsec_sa.c;h=0e1e63d0db4ab16b976ba5c0f5bf88c027e22c74;hp=b0de76ac5086987dcca9be7bfd80f1b4b41844a5;hb=e5d34919b;hpb=b4cfd55f25cb87acff732fc40633d055cfedd816

diff --git a/src/vnet/ipsec/ipsec_sa.c b/src/vnet/ipsec/ipsec_sa.c
index b0de76ac508..0e1e63d0db4 100644
--- a/src/vnet/ipsec/ipsec_sa.c
+++ b/src/vnet/ipsec/ipsec_sa.c
@@ -14,7 +14,21 @@
  */
 
 #include <vnet/ipsec/ipsec.h>
+#include <vnet/ipsec/esp.h>
+#include <vnet/udp/udp.h>
 #include <vnet/fib/fib_table.h>
+#include <vnet/fib/fib_entry_track.h>
+#include <vnet/ipsec/ipsec_tun.h>
+
+/**
+ * @brief
+ * SA packet & bytes counters
+ */
+vlib_combined_counter_main_t ipsec_sa_counters = {
+  .name = "SA",
+  .stat_segment_name = "/net/ipsec/sa",
+};
+
 
 static clib_error_t *
 ipsec_call_add_del_callbacks (ipsec_main_t * im, ipsec_sa_t * sa,
@@ -54,43 +68,77 @@ ipsec_mk_key (ipsec_key_t * key, const u8 * data, u8 len)
 /**
  * 'stack' (resolve the recursion for) the SA tunnel destination
  */
-void
+static void
 ipsec_sa_stack (ipsec_sa_t * sa)
 {
   ipsec_main_t *im = &ipsec_main;
   fib_forward_chain_type_t fct;
   dpo_id_t tmp = DPO_INVALID;
 
-  fct = fib_forw_chain_type_from_fib_proto ((sa->is_tunnel_ip6 ?
-					     FIB_PROTOCOL_IP6 :
-					     FIB_PROTOCOL_IP4));
+  fct =
+    fib_forw_chain_type_from_fib_proto ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
+					 FIB_PROTOCOL_IP6 :
+					 FIB_PROTOCOL_IP4));
 
   fib_entry_contribute_forwarding (sa->fib_entry_index, fct, &tmp);
 
-  dpo_stack_from_node ((sa->is_tunnel_ip6 ?
-			im->ah6_encrypt_node_index :
-			im->ah4_encrypt_node_index),
-		       &sa->dpo[IPSEC_PROTOCOL_AH], &tmp);
-  dpo_stack_from_node ((sa->is_tunnel_ip6 ?
-			im->esp6_encrypt_node_index :
-			im->esp4_encrypt_node_index),
-		       &sa->dpo[IPSEC_PROTOCOL_ESP], &tmp);
+  if (IPSEC_PROTOCOL_AH == sa->protocol)
+    dpo_stack_from_node ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
+			  im->ah6_encrypt_node_index :
+			  im->ah4_encrypt_node_index), &sa->dpo, &tmp);
+  else
+    dpo_stack_from_node ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
+			  im->esp6_encrypt_node_index :
+			  im->esp4_encrypt_node_index), &sa->dpo, &tmp);
   dpo_reset (&tmp);
 }
 
+void
+ipsec_sa_set_crypto_alg (ipsec_sa_t * sa, ipsec_crypto_alg_t crypto_alg)
+{
+  ipsec_main_t *im = &ipsec_main;
+  sa->crypto_alg = crypto_alg;
+  sa->crypto_iv_size = im->crypto_algs[crypto_alg].iv_size;
+  sa->crypto_block_size = im->crypto_algs[crypto_alg].block_size;
+  sa->crypto_enc_op_id = im->crypto_algs[crypto_alg].enc_op_id;
+  sa->crypto_dec_op_id = im->crypto_algs[crypto_alg].dec_op_id;
+  sa->crypto_calg = im->crypto_algs[crypto_alg].alg;
+  ASSERT (sa->crypto_iv_size <= ESP_MAX_IV_SIZE);
+  ASSERT (sa->crypto_block_size <= ESP_MAX_BLOCK_SIZE);
+  if (IPSEC_CRYPTO_ALG_IS_GCM (crypto_alg))
+    {
+      sa->integ_icv_size = im->crypto_algs[crypto_alg].icv_size;
+      ipsec_sa_set_IS_AEAD (sa);
+    }
+}
+
+void
+ipsec_sa_set_integ_alg (ipsec_sa_t * sa, ipsec_integ_alg_t integ_alg)
+{
+  ipsec_main_t *im = &ipsec_main;
+  sa->integ_alg = integ_alg;
+  sa->integ_icv_size = im->integ_algs[integ_alg].icv_size;
+  sa->integ_op_id = im->integ_algs[integ_alg].op_id;
+  sa->integ_calg = im->integ_algs[integ_alg].alg;
+  ASSERT (sa->integ_icv_size <= ESP_MAX_ICV_SIZE);
+}
+
 int
-ipsec_sa_add (u32 id,
-	      u32 spi,
-	      ipsec_protocol_t proto,
-	      ipsec_crypto_alg_t crypto_alg,
-	      const ipsec_key_t * ck,
-	      ipsec_integ_alg_t integ_alg,
-	      const ipsec_key_t * ik,
-	      ipsec_sa_flags_t flags,
-	      u32 tx_table_id,
-	      const ip46_address_t * tun_src,
-	      const ip46_address_t * tun_dst, u32 * sa_out_index)
+ipsec_sa_add_and_lock (u32 id,
+		       u32 spi,
+		       ipsec_protocol_t proto,
+		       ipsec_crypto_alg_t crypto_alg,
+		       const ipsec_key_t * ck,
+		       ipsec_integ_alg_t integ_alg,
+		       const ipsec_key_t * ik,
+		       ipsec_sa_flags_t flags,
+		       u32 tx_table_id,
+		       u32 salt,
+		       const ip46_address_t * tun_src,
+		       const ip46_address_t * tun_dst, u32 * sa_out_index,
+		       u16 dst_port)
 {
+  vlib_main_t *vm = vlib_get_main ();
   ipsec_main_t *im = &ipsec_main;
   clib_error_t *err;
   ipsec_sa_t *sa;
@@ -101,31 +149,54 @@ ipsec_sa_add (u32 id,
   if (p)
     return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
 
-  pool_get_zero (im->sad, sa);
+  pool_get_aligned_zero (im->sad, sa, CLIB_CACHE_LINE_BYTES);
 
   fib_node_init (&sa->node, FIB_NODE_TYPE_IPSEC_SA);
+  fib_node_lock (&sa->node);
   sa_index = sa - im->sad;
 
+  vlib_validate_combined_counter (&ipsec_sa_counters, sa_index);
+  vlib_zero_combined_counter (&ipsec_sa_counters, sa_index);
+
   sa->id = id;
   sa->spi = spi;
+  sa->stat_index = sa_index;
   sa->protocol = proto;
-  sa->crypto_alg = crypto_alg;
+  sa->flags = flags;
+  sa->salt = salt;
+  sa->encrypt_thread_index = (vlib_num_workers ())? ~0 : 0;
+  sa->decrypt_thread_index = (vlib_num_workers ())? ~0 : 0;
+  if (integ_alg != IPSEC_INTEG_ALG_NONE)
+    {
+      ipsec_sa_set_integ_alg (sa, integ_alg);
+      clib_memcpy (&sa->integ_key, ik, sizeof (sa->integ_key));
+    }
+  ipsec_sa_set_crypto_alg (sa, crypto_alg);
   clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
-  sa->integ_alg = integ_alg;
-  clib_memcpy (&sa->integ_key, ik, sizeof (sa->integ_key));
   ip46_address_copy (&sa->tunnel_src_addr, tun_src);
   ip46_address_copy (&sa->tunnel_dst_addr, tun_dst);
 
-  if (flags & IPSEC_SA_FLAG_USE_EXTENDED_SEQ_NUM)
-    sa->use_esn = 1;
-  if (flags & IPSEC_SA_FLAG_USE_ANTI_REPLAY)
-    sa->use_anti_replay = 1;
-  if (flags & IPSEC_SA_FLAG_IS_TUNNEL)
-    sa->is_tunnel = 1;
-  if (flags & IPSEC_SA_FLAG_IS_TUNNEL_V6)
-    sa->is_tunnel_ip6 = 1;
-  if (flags & IPSEC_SA_FLAG_UDP_ENCAP)
-    sa->udp_encap = 1;
+  sa->crypto_key_index = vnet_crypto_key_add (vm,
+					      im->crypto_algs[crypto_alg].alg,
+					      (u8 *) ck->data, ck->len);
+  if (~0 == sa->crypto_key_index)
+    {
+      pool_put (im->sad, sa);
+      return VNET_API_ERROR_KEY_LENGTH;
+    }
+
+  if (integ_alg != IPSEC_INTEG_ALG_NONE)
+    {
+      sa->integ_key_index = vnet_crypto_key_add (vm,
+						 im->
+						 integ_algs[integ_alg].alg,
+						 (u8 *) ik->data, ik->len);
+      if (~0 == sa->integ_key_index)
+	{
+	  pool_put (im->sad, sa);
+	  return VNET_API_ERROR_KEY_LENGTH;
+	}
+    }
 
   err = ipsec_check_support_cb (im, sa);
   if (err)
@@ -142,13 +213,13 @@ ipsec_sa_add (u32 id,
       return VNET_API_ERROR_SYSCALL_ERROR_1;
     }
 
-  if (sa->is_tunnel)
+  if (ipsec_sa_is_set_IS_TUNNEL (sa) && !ipsec_sa_is_set_IS_INBOUND (sa))
     {
-      fib_protocol_t fproto = (sa->is_tunnel_ip6 ?
+      fib_protocol_t fproto = (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
 			       FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
       fib_prefix_t pfx = {
 	.fp_addr = sa->tunnel_dst_addr,
-	.fp_len = (sa->is_tunnel_ip6 ? 128 : 32),
+	.fp_len = (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ? 128 : 32),
 	.fp_proto = fproto,
       };
       sa->tx_fib_index = fib_table_find (fproto, tx_table_id);
@@ -158,14 +229,59 @@ ipsec_sa_add (u32 id,
 	  return VNET_API_ERROR_NO_SUCH_FIB;
 	}
 
-      sa->fib_entry_index = fib_table_entry_special_add (sa->tx_fib_index,
-							 &pfx,
-							 FIB_SOURCE_RR,
-							 FIB_ENTRY_FLAG_NONE);
-      sa->sibling = fib_entry_child_add (sa->fib_entry_index,
-					 FIB_NODE_TYPE_IPSEC_SA, sa_index);
+      sa->fib_entry_index = fib_entry_track (sa->tx_fib_index,
+					     &pfx,
+					     FIB_NODE_TYPE_IPSEC_SA,
+					     sa_index, &sa->sibling);
       ipsec_sa_stack (sa);
+
+      /* generate header templates */
+      if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa))
+	{
+	  sa->ip6_hdr.ip_version_traffic_class_and_flow_label = 0x60;
+	  sa->ip6_hdr.hop_limit = 254;
+	  sa->ip6_hdr.src_address.as_u64[0] =
+	    sa->tunnel_src_addr.ip6.as_u64[0];
+	  sa->ip6_hdr.src_address.as_u64[1] =
+	    sa->tunnel_src_addr.ip6.as_u64[1];
+	  sa->ip6_hdr.dst_address.as_u64[0] =
+	    sa->tunnel_dst_addr.ip6.as_u64[0];
+	  sa->ip6_hdr.dst_address.as_u64[1] =
+	    sa->tunnel_dst_addr.ip6.as_u64[1];
+	  if (ipsec_sa_is_set_UDP_ENCAP (sa))
+	    sa->ip6_hdr.protocol = IP_PROTOCOL_UDP;
+	  else
+	    sa->ip6_hdr.protocol = IP_PROTOCOL_IPSEC_ESP;
+	}
+      else
+	{
+	  sa->ip4_hdr.ip_version_and_header_length = 0x45;
+	  sa->ip4_hdr.ttl = 254;
+	  sa->ip4_hdr.src_address.as_u32 = sa->tunnel_src_addr.ip4.as_u32;
+	  sa->ip4_hdr.dst_address.as_u32 = sa->tunnel_dst_addr.ip4.as_u32;
+
+	  if (ipsec_sa_is_set_UDP_ENCAP (sa))
+	    sa->ip4_hdr.protocol = IP_PROTOCOL_UDP;
+	  else
+	    sa->ip4_hdr.protocol = IP_PROTOCOL_IPSEC_ESP;
+	  sa->ip4_hdr.checksum = ip4_header_checksum (&sa->ip4_hdr);
+	}
     }
+
+  if (ipsec_sa_is_set_UDP_ENCAP (sa))
+    {
+      if (dst_port == IPSEC_UDP_PORT_NONE)
+	{
+	  sa->udp_hdr.src_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
+	  sa->udp_hdr.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
+	}
+      else
+	{
+	  sa->udp_hdr.src_port = clib_host_to_net_u16 (dst_port);
+	  sa->udp_hdr.dst_port = clib_host_to_net_u16 (dst_port);
+	}
+    }
+
   hash_set (im->sa_index_by_sa_id, sa->id, sa_index);
 
   if (sa_out_index)
@@ -174,119 +290,97 @@ ipsec_sa_add (u32 id,
   return (0);
 }
 
-u32
-ipsec_sa_del (u32 id)
+static void
+ipsec_sa_del (ipsec_sa_t * sa)
 {
+  vlib_main_t *vm = vlib_get_main ();
   ipsec_main_t *im = &ipsec_main;
-  ipsec_sa_t *sa = 0;
-  uword *p;
   u32 sa_index;
-  clib_error_t *err;
 
-  p = hash_get (im->sa_index_by_sa_id, id);
+  sa_index = sa - im->sad;
+  hash_unset (im->sa_index_by_sa_id, sa->id);
 
-  if (!p)
-    return VNET_API_ERROR_NO_SUCH_ENTRY;
+  /* no recovery possible when deleting an SA */
+  (void) ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
 
-  sa_index = p[0];
-  sa = pool_elt_at_index (im->sad, sa_index);
-  if (ipsec_is_sa_used (sa_index))
-    {
-      clib_warning ("sa_id %u used in policy", sa->id);
-      /* sa used in policy */
-      return VNET_API_ERROR_SYSCALL_ERROR_1;
-    }
-  hash_unset (im->sa_index_by_sa_id, sa->id);
-  err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
-  if (err)
-    return VNET_API_ERROR_SYSCALL_ERROR_1;
-  if (sa->is_tunnel)
+  if (ipsec_sa_is_set_IS_TUNNEL (sa) && !ipsec_sa_is_set_IS_INBOUND (sa))
     {
-      fib_entry_child_remove (sa->fib_entry_index, sa->sibling);
-      fib_table_entry_special_remove
-	(sa->tx_fib_index,
-	 fib_entry_get_prefix (sa->fib_entry_index), FIB_SOURCE_RR);
-      dpo_reset (&sa->dpo[IPSEC_PROTOCOL_AH]);
-      dpo_reset (&sa->dpo[IPSEC_PROTOCOL_ESP]);
+      fib_entry_untrack (sa->fib_entry_index, sa->sibling);
+      dpo_reset (&sa->dpo);
     }
+  vnet_crypto_key_del (vm, sa->crypto_key_index);
+  if (sa->integ_alg != IPSEC_INTEG_ALG_NONE)
+    vnet_crypto_key_del (vm, sa->integ_key_index);
   pool_put (im->sad, sa);
-  return 0;
 }
 
-u8
-ipsec_is_sa_used (u32 sa_index)
+void
+ipsec_sa_unlock (index_t sai)
 {
   ipsec_main_t *im = &ipsec_main;
-  ipsec_tunnel_if_t *t;
-  ipsec_policy_t *p;
+  ipsec_sa_t *sa;
 
-  /* *INDENT-OFF* */
-  pool_foreach(p, im->policies, ({
-     if (p->policy == IPSEC_POLICY_ACTION_PROTECT)
-       {
-         if (p->sa_index == sa_index)
-           return 1;
-       }
-  }));
+  if (INDEX_INVALID == sai)
+    return;
 
-  pool_foreach(t, im->tunnel_interfaces, ({
-    if (t->input_sa_index == sa_index)
-      return 1;
-    if (t->output_sa_index == sa_index)
-      return 1;
-  }));
-  /* *INDENT-ON* */
+  sa = pool_elt_at_index (im->sad, sai);
 
-  return 0;
+  fib_node_unlock (&sa->node);
 }
 
-int
-ipsec_set_sa_key (u32 id, const ipsec_key_t * ck, const ipsec_key_t * ik)
+void
+ipsec_sa_lock (index_t sai)
 {
   ipsec_main_t *im = &ipsec_main;
+  ipsec_sa_t *sa;
+
+  if (INDEX_INVALID == sai)
+    return;
+
+  sa = pool_elt_at_index (im->sad, sai);
+
+  fib_node_lock (&sa->node);
+}
+
+index_t
+ipsec_sa_find_and_lock (u32 id)
+{
+  ipsec_main_t *im = &ipsec_main;
+  ipsec_sa_t *sa;
   uword *p;
-  u32 sa_index;
-  ipsec_sa_t *sa = 0;
-  clib_error_t *err;
 
   p = hash_get (im->sa_index_by_sa_id, id);
-  if (!p)
-    return VNET_API_ERROR_SYSCALL_ERROR_1;	/* no such sa-id */
 
-  sa_index = p[0];
-  sa = pool_elt_at_index (im->sad, sa_index);
-
-  /* new crypto key */
-  if (ck)
-    {
-      clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
-    }
+  if (!p)
+    return INDEX_INVALID;
 
-  /* new integ key */
-  if (ik)
-    {
-      clib_memcpy (&sa->integ_key, 0, sizeof (sa->integ_key));
-    }
+  sa = pool_elt_at_index (im->sad, p[0]);
 
-  if (ck || ik)
-    {
-      err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
-      if (err)
-	return VNET_API_ERROR_SYSCALL_ERROR_1;
-    }
+  fib_node_lock (&sa->node);
 
-  return 0;
+  return (p[0]);
 }
 
-u32
-ipsec_get_sa_index_by_sa_id (u32 sa_id)
+int
+ipsec_sa_unlock_id (u32 id)
 {
   ipsec_main_t *im = &ipsec_main;
-  uword *p = hash_get (im->sa_index_by_sa_id, sa_id);
+  uword *p;
+
+  p = hash_get (im->sa_index_by_sa_id, id);
+
   if (!p)
-    return ~0;
+    return VNET_API_ERROR_NO_SUCH_ENTRY;
 
-  return p[0];
+  ipsec_sa_unlock (p[0]);
+
+  return (0);
+}
+
+void
+ipsec_sa_clear (index_t sai)
+{
+  vlib_zero_combined_counter (&ipsec_sa_counters, sai);
 }
 
 void
@@ -319,6 +413,15 @@ ipsec_sa_fib_node_get (fib_node_index_t index)
   return (&sa->node);
 }
 
+static ipsec_sa_t *
+ipsec_sa_from_fib_node (fib_node_t * node)
+{
+  ASSERT (FIB_NODE_TYPE_IPSEC_SA == node->fn_type);
+  return ((ipsec_sa_t *) (((char *) node) -
+			  STRUCT_OFFSET_OF (ipsec_sa_t, node)));
+
+}
+
 /**
  * Function definition to inform the FIB node that its last lock has gone.
  */
@@ -329,16 +432,7 @@ ipsec_sa_last_lock_gone (fib_node_t * node)
    * The ipsec SA is a root of the graph. As such
    * it never has children and thus is never locked.
    */
-  ASSERT (0);
-}
-
-static ipsec_sa_t *
-ipsec_sa_from_fib_node (fib_node_t * node)
-{
-  ASSERT (FIB_NODE_TYPE_IPSEC_SA == node->fn_type);
-  return ((ipsec_sa_t *) (((char *) node) -
-			  STRUCT_OFFSET_OF (ipsec_sa_t, node)));
-
+  ipsec_sa_del (ipsec_sa_from_fib_node (node));
 }
 
 /**
@@ -353,7 +447,7 @@ ipsec_sa_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
 }
 
 /*
- * Virtual function table registered by MPLS GRE tunnels
+ * Virtual function table registered by SAs
  * for participation in the FIB object graph.
  */
 const static fib_node_vft_t ipsec_sa_vft = {