ikev2: fix issue when sending multiple requests at once

Type: fix

Change-Id: I8ed556de4370a03d10c56cce101cd5ea0d0aaf8b
Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
(cherry picked from commit 38340fa32c96e9c6cb1593f03117dd504efbd5f4)

2 files changed, 68 insertions, 20 deletions

diff --git a/src/plugins/ikev2/ikev2.c b/src/plugins/ikev2/ikev2.c
index a2640f03bdb..2423bf2058d 100644
--- a/src/plugins/ikev2/ikev2.c
+++ b/src/plugins/ikev2/ikev2.c
@@ -1413,7 +1413,9 @@ ikev2_process_create_child_sa_req (vlib_main_t * vm,
   if (sa->is_initiator && proposal
       && proposal->protocol_id == IKEV2_PROTOCOL_ESP)
     {
-      ikev2_rekey_t *rekey = &sa->rekey[0];
+      ikev2_rekey_t *rekey = sa->rekey;
+      if (vec_len (rekey) == 0)
+	goto cleanup_and_exit;
       rekey->protocol_id = proposal->protocol_id;
       rekey->i_proposal =
 	ikev2_select_proposal (proposal, IKEV2_PROTOCOL_ESP);
@@ -4433,6 +4435,7 @@ ikev2_rekey_child_sa_internal (vlib_main_t * vm, ikev2_sa_t * sa,
   sa->last_init_msg_id += 1;
 
   ikev2_rekey_t *rekey;
+  vec_reset_length (sa->rekey);
   vec_add2 (sa->rekey, rekey, 1);
   ikev2_sa_proposal_t *proposals = vec_dup (csa->i_proposals);
 
diff --git a/src/plugins/ikev2/test/test_ikev2.py b/src/plugins/ikev2/test/test_ikev2.py
index 453a47e04c8..eb2c5f988d4 100644
--- a/src/plugins/ikev2/test/test_ikev2.py
+++ b/src/plugins/ikev2/test/test_ikev2.py
@@ -586,6 +586,27 @@ class IkePeer(VppTestCase):
         self.vapi.cli('ikev2 set logging level 4')
         self.vapi.cli('event-lo clear')
 
+    def create_rekey_request(self):
+        sa, first_payload = self.generate_auth_payload(is_rekey=True)
+        header = ikev2.IKEv2(
+                init_SPI=self.sa.ispi,
+                resp_SPI=self.sa.rspi, id=self.sa.new_msg_id(),
+                flags='Initiator', exch_type='CREATE_CHILD_SA')
+
+        ike_msg = self.encrypt_ike_msg(header, sa, first_payload)
+        return self.create_packet(self.pg0, ike_msg, self.sa.sport,
+                                  self.sa.dport, self.sa.natt, self.ip6)
+
+    def create_empty_request(self):
+        header = ikev2.IKEv2(init_SPI=self.sa.ispi, resp_SPI=self.sa.rspi,
+                             id=self.sa.new_msg_id(), flags='Initiator',
+                             exch_type='INFORMATIONAL',
+                             next_payload='Encrypted')
+
+        msg = self.encrypt_ike_msg(header, b'', None)
+        return self.create_packet(self.pg0, msg, self.sa.sport,
+                                  self.sa.dport, self.sa.natt, self.ip6)
+
     def create_packet(self, src_if, msg, sport=500, dport=500, natt=False,
                       use_ip6=False):
         if use_ip6:
@@ -1591,6 +1612,47 @@ class TestInitiatorPsk(TemplateInitiator, Ikev2Params):
                 'integ_alg': 12}})
 
 
+class TestInitiatorRequestWindowSize(TestInitiatorPsk):
+    """ test initiator - request window size (1) """
+
+    def rekey_respond(self, req, update_child_sa_data):
+        ih = self.get_ike_header(req)
+        plain = self.sa.hmac_and_decrypt(ih)
+        sa = ikev2.IKEv2_payload_SA(plain)
+        if update_child_sa_data:
+            prop = sa[ikev2.IKEv2_payload_Proposal]
+            self.sa.i_nonce = sa[ikev2.IKEv2_payload_Nonce].load
+            self.sa.r_nonce = self.sa.i_nonce
+            self.sa.child_sas[0].ispi = prop.SPI
+            self.sa.child_sas[0].rspi = prop.SPI
+            self.sa.calc_child_keys()
+
+        header = ikev2.IKEv2(init_SPI=self.sa.ispi, resp_SPI=self.sa.rspi,
+                             flags='Response', exch_type=36,
+                             id=ih.id, next_payload='Encrypted')
+        resp = self.encrypt_ike_msg(header, sa, 'SA')
+        packet = self.create_packet(self.pg0, resp, self.sa.sport,
+                                    self.sa.dport, self.sa.natt, self.ip6)
+        self.send_and_assert_no_replies(self.pg0, packet)
+
+    def test_initiator(self):
+        super(TestInitiatorRequestWindowSize, self).test_initiator()
+        self.pg0.enable_capture()
+        self.pg_start()
+        ispi = int.from_bytes(self.sa.child_sas[0].ispi, 'little')
+        self.vapi.ikev2_initiate_rekey_child_sa(ispi=ispi)
+        self.vapi.ikev2_initiate_rekey_child_sa(ispi=ispi)
+        capture = self.pg0.get_capture(2)
+
+        # reply in reverse order
+        self.rekey_respond(capture[1], True)
+        self.rekey_respond(capture[0], False)
+
+        # verify that only the second request was accepted
+        self.verify_ike_sas()
+        self.verify_ipsec_sas(is_rekey=True)
+
+
 class TestInitiatorRekey(TestInitiatorPsk):
     """ test ikev2 initiator - rekey """
 
@@ -1607,7 +1669,6 @@ class TestInitiatorRekey(TestInitiatorPsk):
         plain = self.sa.hmac_and_decrypt(ih)
         sa = ikev2.IKEv2_payload_SA(plain)
         prop = sa[ikev2.IKEv2_payload_Proposal]
-        nonce = sa[ikev2.IKEv2_payload_Nonce]
         self.sa.i_nonce = sa[ikev2.IKEv2_payload_Nonce].load
         self.sa.r_nonce = self.sa.i_nonce
         # update new responder SPI
@@ -1700,15 +1761,7 @@ class TestResponderRekey(TestResponderPsk):
     """ test ikev2 responder - rekey """
 
     def rekey_from_initiator(self):
-        sa, first_payload = self.generate_auth_payload(is_rekey=True)
-        header = ikev2.IKEv2(
-                init_SPI=self.sa.ispi,
-                resp_SPI=self.sa.rspi, id=self.sa.new_msg_id(),
-                flags='Initiator', exch_type='CREATE_CHILD_SA')
-
-        ike_msg = self.encrypt_ike_msg(header, sa, first_payload)
-        packet = self.create_packet(self.pg0, ike_msg, self.sa.sport,
-                                    self.sa.dport, self.sa.natt, self.ip6)
+        packet = self.create_rekey_request()
         self.pg0.add_stream(packet)
         self.pg0.enable_capture()
         self.pg_start()
@@ -1717,7 +1770,6 @@ class TestResponderRekey(TestResponderPsk):
         plain = self.sa.hmac_and_decrypt(ih)
         sa = ikev2.IKEv2_payload_SA(plain)
         prop = sa[ikev2.IKEv2_payload_Proposal]
-        nonce = sa[ikev2.IKEv2_payload_Nonce]
         self.sa.r_nonce = sa[ikev2.IKEv2_payload_Nonce].load
         # update new responder SPI
         self.sa.child_sas[0].rspi = prop.SPI
@@ -1794,14 +1846,7 @@ class TestInitiatorKeepaliveMsg(TestInitiatorPsk):
     """
 
     def send_empty_req_from_responder(self):
-        header = ikev2.IKEv2(init_SPI=self.sa.ispi, resp_SPI=self.sa.rspi,
-                             id=self.sa.new_msg_id(), flags='Initiator',
-                             exch_type='INFORMATIONAL',
-                             next_payload='Encrypted')
-
-        msg = self.encrypt_ike_msg(header, b'', None)
-        packet = self.create_packet(self.pg0, msg, self.sa.sport,
-                                    self.sa.dport, self.sa.natt, self.ip6)
+        packet = self.create_empty_request()
         self.pg0.add_stream(packet)
         self.pg0.enable_capture()
         self.pg_start()