IPSEC: minor refactor

No function change. Only breaking the monster ipsec.[hc]
into smaller constituent parts

Change-Id: I3fd4d2d041673db5865d46a4002f6bd383f378af
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 174 insertions, 0 deletions

diff --git a/src/vnet/ipsec/ipsec_sa.c b/src/vnet/ipsec/ipsec_sa.c
new file mode 100644
index 00000000000..a76197b9f50
--- /dev/null
+++ b/src/vnet/ipsec/ipsec_sa.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/ipsec/ipsec.h>
+
+static clib_error_t *
+ipsec_call_add_del_callbacks (ipsec_main_t * im, ipsec_sa_t * sa,
+			      u32 sa_index, int is_add)
+{
+  ipsec_ah_backend_t *ab;
+  ipsec_esp_backend_t *eb;
+  switch (sa->protocol)
+    {
+    case IPSEC_PROTOCOL_AH:
+      ab = pool_elt_at_index (im->ah_backends, im->ah_current_backend);
+      if (ab->add_del_sa_sess_cb)
+	return ab->add_del_sa_sess_cb (sa_index, is_add);
+      break;
+    case IPSEC_PROTOCOL_ESP:
+      eb = pool_elt_at_index (im->esp_backends, im->esp_current_backend);
+      if (eb->add_del_sa_sess_cb)
+	return eb->add_del_sa_sess_cb (sa_index, is_add);
+      break;
+    }
+  return 0;
+}
+
+int
+ipsec_add_del_sa (vlib_main_t * vm, ipsec_sa_t * new_sa, int is_add)
+{
+  ipsec_main_t *im = &ipsec_main;
+  ipsec_sa_t *sa = 0;
+  uword *p;
+  u32 sa_index;
+  clib_error_t *err;
+
+  clib_warning ("id %u spi %u", new_sa->id, new_sa->spi);
+
+  p = hash_get (im->sa_index_by_sa_id, new_sa->id);
+  if (p && is_add)
+    return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
+  if (!p && !is_add)
+    return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+  if (!is_add)			/* delete */
+    {
+      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);
+	  return VNET_API_ERROR_SYSCALL_ERROR_1;	/* sa used in policy */
+	}
+      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;
+      pool_put (im->sad, sa);
+    }
+  else				/* create new SA */
+    {
+      pool_get (im->sad, sa);
+      clib_memcpy (sa, new_sa, sizeof (*sa));
+      sa_index = sa - im->sad;
+      hash_set (im->sa_index_by_sa_id, sa->id, sa_index);
+      err = ipsec_call_add_del_callbacks (im, sa, sa_index, 1);
+      if (err)
+	return VNET_API_ERROR_SYSCALL_ERROR_1;
+    }
+  return 0;
+}
+
+u8
+ipsec_is_sa_used (u32 sa_index)
+{
+  ipsec_main_t *im = &ipsec_main;
+  ipsec_spd_t *spd;
+  ipsec_policy_t *p;
+  ipsec_tunnel_if_t *t;
+
+  /* *INDENT-OFF* */
+  pool_foreach(spd, im->spds, ({
+    pool_foreach(p, spd->policies, ({
+      if (p->policy == IPSEC_POLICY_ACTION_PROTECT)
+        {
+          if (p->sa_index == sa_index)
+            return 1;
+        }
+    }));
+  }));
+
+  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* */
+
+  return 0;
+}
+
+int
+ipsec_set_sa_key (vlib_main_t * vm, ipsec_sa_t * sa_update)
+{
+  ipsec_main_t *im = &ipsec_main;
+  uword *p;
+  u32 sa_index;
+  ipsec_sa_t *sa = 0;
+  clib_error_t *err;
+
+  p = hash_get (im->sa_index_by_sa_id, sa_update->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 (0 < sa_update->crypto_key_len)
+    {
+      clib_memcpy (sa->crypto_key, sa_update->crypto_key,
+		   sa_update->crypto_key_len);
+      sa->crypto_key_len = sa_update->crypto_key_len;
+    }
+
+  /* new integ key */
+  if (0 < sa_update->integ_key_len)
+    {
+      clib_memcpy (sa->integ_key, sa_update->integ_key,
+		   sa_update->integ_key_len);
+      sa->integ_key_len = sa_update->integ_key_len;
+    }
+
+  if (0 < sa_update->crypto_key_len || 0 < sa_update->integ_key_len)
+    {
+      err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
+      if (err)
+	return VNET_API_ERROR_SYSCALL_ERROR_1;
+    }
+
+  return 0;
+}
+
+u32
+ipsec_get_sa_index_by_sa_id (u32 sa_id)
+{
+  ipsec_main_t *im = &ipsec_main;
+  uword *p = hash_get (im->sa_index_by_sa_id, sa_id);
+  if (!p)
+    return ~0;
+
+  return p[0];
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */