From aa7cfd04e7bb89208afe57cd84e96ced32153044 Mon Sep 17 00:00:00 2001 From: Neale Ranns Date: Thu, 24 Mar 2022 12:28:42 +0000 Subject: [PATCH] ip: The check for 'same packet' must include the FIB index Type: fix otherwise if two packets arrive with the same source address but from different VRFs, then they are treated as the same and they use the same LB and thus share the same fate. but the lookup, when done, results in two different LBs, and hence the fate can be different. Signed-off-by: Neale Ranns Change-Id: Id6e16f7c577a561d9ddd7066339fa4385361d07f --- src/vnet/ip/ip4_forward.c | 13 +++- test/test_ip4.py | 181 ++++++++++++++++++++++++++++++++++++++++++++++ test/vpp_ip.py | 1 + 3 files changed, 193 insertions(+), 2 deletions(-) diff --git a/src/vnet/ip/ip4_forward.c b/src/vnet/ip/ip4_forward.c index 3556d357f50..c1bfc7d4ce5 100644 --- a/src/vnet/ip/ip4_forward.c +++ b/src/vnet/ip/ip4_forward.c @@ -1517,7 +1517,9 @@ ip4_local_set_next_and_error (vlib_node_runtime_t * error_node, typedef struct { + /* The src and fib-index together determine if packet n is the same as n-1 */ ip4_address_t src; + u32 fib_index; u32 lbi; u8 error; u8 first; @@ -1551,7 +1553,8 @@ ip4_local_check_src (vlib_buffer_t *b, ip4_header_t *ip0, * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the * adjacency for the source address (the remote sender's address) */ - if (PREDICT_TRUE (last_check->src.as_u32 != ip0->src_address.as_u32) || + if (PREDICT_TRUE ((last_check->src.as_u32 != ip0->src_address.as_u32)) || + (last_check->fib_index != vnet_buffer (b)->ip.fib_index) || last_check->first) { lbi0 = ip4_fib_forwarding_lookup (vnet_buffer (b)->ip.fib_index, @@ -1587,6 +1590,7 @@ ip4_local_check_src (vlib_buffer_t *b, ip4_header_t *ip0, last_check->lbi = lbi0; last_check->error = *error0; last_check->first = 0; + last_check->fib_index = vnet_buffer (b)->ip.fib_index; } else { @@ -1621,6 +1625,9 @@ ip4_local_check_src_x2 (vlib_buffer_t **b, ip4_header_t **ip, vnet_buffer (b[1])->sw_if_index[VLIB_TX] : vnet_buffer (b[1])->ip.fib_index; + not_last_hit |= vnet_buffer (b[0])->ip.fib_index ^ last_check->fib_index; + not_last_hit |= vnet_buffer (b[1])->ip.fib_index ^ last_check->fib_index; + if (is_receive_dpo) { const receive_dpo_t *rd0, *rd1; @@ -1683,6 +1690,7 @@ ip4_local_check_src_x2 (vlib_buffer_t **b, ip4_header_t **ip, last_check->lbi = lbi[1]; last_check->error = error[1]; last_check->first = 0; + last_check->fib_index = vnet_buffer (b[1])->ip.fib_index; } else { @@ -1752,10 +1760,11 @@ ip4_local_inline (vlib_main_t *vm, vlib_node_runtime_t *node, * member to make sure the .lbi is initialised for the first * packet. */ - .src = {.as_u32 = 0}, + .src = { .as_u32 = 0 }, .lbi = ~0, .error = IP4_ERROR_UNKNOWN_PROTOCOL, .first = 1, + .fib_index = 0, }; from = vlib_frame_vector_args (frame); diff --git a/test/test_ip4.py b/test/test_ip4.py index fb9b8faa769..3a48274691a 100644 --- a/test/test_ip4.py +++ b/test/test_ip4.py @@ -7,6 +7,7 @@ import unittest import scapy.compat from scapy.contrib.mpls import MPLS from scapy.layers.inet import IP, UDP, TCP, ICMP, icmptypes, icmpcodes +from scapy.layers.inet6 import IPv6 from scapy.layers.l2 import Ether, Dot1Q, ARP from scapy.packet import Raw from six import moves @@ -1460,6 +1461,20 @@ class IPPuntSetup(object): self.vapi.set_punt(is_add=1, punt=punt_udp) + af_ip6 = VppEnum.vl_api_address_family_t.ADDRESS_IP6 + punt_udp = { + 'type': pt_l4, + 'punt': { + 'l4': { + 'af': af_ip6, + 'protocol': udp_proto, + 'port': 1236, + } + } + } + + self.vapi.set_punt(is_add=1, punt=punt_udp) + self.pkt = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) / IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) / @@ -1569,6 +1584,172 @@ class TestIPPunt(IPPuntSetup, VppTestCase): self.send_and_expect(self.pg0, pkts, self.pg1) ip_punt_redirect.remove_vpp_config() + def test_ip_punt_vrf(self): + """ IP punt/local with VRFs """ + + # use a punt redirect to test if for-us packets are accepted + pkts = self.pkt * 1025 + + vlans_pg0 = [VppDot1QSubint(self, self.pg0, v) + for v in range(100, 104)] + vlans_pg1 = [VppDot1QSubint(self, self.pg1, v) + for v in range(100, 104)] + tbl4 = [VppIpTable(self, v).add_vpp_config() + for v in range(100, 104)] + tbl6 = [VppIpTable(self, v, True).add_vpp_config() + for v in range(100, 104)] + + for v in vlans_pg0 + vlans_pg1: + v.admin_up() + v.set_table_ip4(v.vlan) + v.set_table_ip6(v.vlan) + v.config_ip4() + v.config_ip6() + v.resolve_arp() + v.resolve_ndp() + + [VppIpPuntRedirect + (self, + vlans_pg0[i].sw_if_index, + vlans_pg1[i].sw_if_index, + vlans_pg1[i].remote_ip4).add_vpp_config() + for i in range(4)] + [VppIpPuntRedirect + (self, + vlans_pg0[i].sw_if_index, + vlans_pg1[i].sw_if_index, + vlans_pg1[i].remote_ip6).add_vpp_config() + for i in range(4)] + + pkts = [(Ether(src=self.pg0.remote_mac, + dst=self.pg0.local_mac) / + Dot1Q(vlan=i.vlan) / + IP(src=i.remote_ip4, + dst=i.local_ip4) / + UDP(sport=1234, dport=1234) / + Raw(b'\xa5' * 100)) + for i in vlans_pg0] + + self.send_and_expect(self.pg0, pkts, self.pg1) + + # + # IPv4 + # + + # we reject packets for source addresses in the wrong vlan/VRF + pkts = [(Ether(src=self.pg0.remote_mac, + dst=self.pg0.local_mac) / + Dot1Q(vlan=i.vlan) / + IP(src="1.1.1.1", + dst=i.local_ip4) / + UDP(sport=1234, dport=1234) / + Raw(b'\xa5' * 100)) + for i in vlans_pg0] + # single and dual loop + self.send_and_assert_no_replies(self.pg0, [pkts[0]]) + self.send_and_assert_no_replies(self.pg0, pkts) + + self.assert_error_counter_equal( + "/err/ip4-local/ip4 source lookup miss", + len(pkts) + 1) + + # using the same source in different tables, should reject + # for the table that the source is not present in + # the first packet in the stream is drop + pkts = [(Ether(src=self.pg0.remote_mac, + dst=self.pg0.local_mac) / + Dot1Q(vlan=i.vlan) / + IP(src=vlans_pg0[0].remote_ip4, + dst=i.local_ip4) / + UDP(sport=1234, dport=1234) / + Raw(b'\xa5' * 100)) + for i in vlans_pg0] + # single loop accept and drop + # followed by both in the same frame/loop + self.send_and_expect(self.pg0, [pkts[0]], self.pg1) + self.send_and_assert_no_replies(self.pg0, [pkts[1]]) + self.send_and_expect(self.pg0, pkts * 4, self.pg1, n_rx=4) + + # using the same source in different tables, should reject + # for the table that the source is not present in + # the first packet in the stream is accept + pkts = [(Ether(src=self.pg0.remote_mac, + dst=self.pg0.local_mac) / + Dot1Q(vlan=i.vlan) / + IP(src=vlans_pg0[3].remote_ip4, + dst=i.local_ip4) / + UDP(sport=1234, dport=1234) / + Raw(b'\xa5' * 100)) + for i in vlans_pg0] + + # single loop accept and drop + # followed by both in the same frame/loop + self.send_and_expect(self.pg0, [pkts[3]], self.pg1) + self.send_and_assert_no_replies(self.pg0, [pkts[1]]) + self.send_and_expect(self.pg0, pkts * 4, self.pg1, n_rx=4) + + # + # IPv6 + # + + # we reject packets for source addresses in the wrong vlan/VRF + pkts = [(Ether(src=self.pg0.remote_mac, + dst=self.pg0.local_mac) / + Dot1Q(vlan=i.vlan) / + IPv6(src="1::1", + dst=i.local_ip6) / + UDP(sport=1236, dport=1236) / + Raw(b'\xa5' * 100)) + for i in vlans_pg0] + # single and dual loop + self.send_and_assert_no_replies(self.pg0, [pkts[0]]) + self.send_and_assert_no_replies(self.pg0, pkts) + + self.assert_error_counter_equal( + "/err/ip6-input/ip6 source lookup miss", + len(pkts) + 1) + + # using the same source in different tables, should reject + # for the table that the source is not present in + # the first packet in the stream is drop + pkts = [(Ether(src=self.pg0.remote_mac, + dst=self.pg0.local_mac) / + Dot1Q(vlan=i.vlan) / + IPv6(src=vlans_pg0[0].remote_ip6, + dst=i.local_ip6) / + UDP(sport=1236, dport=1236) / + Raw(b'\xa5' * 100)) + for i in vlans_pg0] + # single loop accept and drop + # followed by both in the same frame/loop + self.send_and_expect(self.pg0, [pkts[0]], self.pg1) + self.send_and_assert_no_replies(self.pg0, [pkts[1]]) + self.send_and_expect(self.pg0, pkts * 4, self.pg1, n_rx=4) + + # using the same source in different tables, should reject + # for the table that the source is not present in + # the first packet in the stream is accept + pkts = [(Ether(src=self.pg0.remote_mac, + dst=self.pg0.local_mac) / + Dot1Q(vlan=i.vlan) / + IPv6(src=vlans_pg0[3].remote_ip6, + dst=i.local_ip6) / + UDP(sport=1236, dport=1236) / + Raw(b'\xa5' * 100)) + for i in vlans_pg0] + + # single loop accept and drop + # followed by both in the same frame/loop + self.send_and_expect(self.pg0, [pkts[3]], self.pg1) + self.send_and_assert_no_replies(self.pg0, [pkts[1]]) + self.send_and_expect(self.pg0, pkts * 4, self.pg1, n_rx=4) + + for v in vlans_pg0 + vlans_pg1: + v.unconfig_ip4() + v.unconfig_ip6() + v.set_table_ip4(0) + v.set_table_ip6(0) + def test_ip_punt_dump(self): """ IP4 punt redirect dump""" diff --git a/test/vpp_ip.py b/test/vpp_ip.py index 81305b2dd9b..48b6b9d2da6 100644 --- a/test/vpp_ip.py +++ b/test/vpp_ip.py @@ -168,6 +168,7 @@ class VppIpPuntRedirect(VppObject): def add_vpp_config(self): self._test.vapi.ip_punt_redirect(punt=self.encode(), is_add=True) self._test.registry.register(self, self._test.logger) + return self def remove_vpp_config(self): self._test.vapi.ip_punt_redirect(punt=self.encode(), is_add=False) -- 2.16.6