diff options
| -rw-r--r-- | src/plugins/map/ip6_map_t.c | 16 | ||||
| -rw-r--r-- | src/plugins/map/test/test_map_br.py | 265 |
2 files changed, 279 insertions, 2 deletions
diff --git a/src/plugins/map/ip6_map_t.c b/src/plugins/map/ip6_map_t.c index 95104dc78f4..e205c60e29a 100644 --- a/src/plugins/map/ip6_map_t.c +++ b/src/plugins/map/ip6_map_t.c @@ -66,7 +66,7 @@ ip6_to_ip4_set_icmp_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *arg) // Security check // Note that this prevents an intermediate IPv6 router from answering // the request. - ip4_sadr = map_get_ip4 (&ip6->src_address, ctx->d->flags); + ip4_sadr = map_get_ip4 (&ip6->src_address, ctx->d->ip6_src_len); if (ip6->src_address.as_u64[0] != map_get_pfx_net (ctx->d, ip4_sadr, ctx->sender_port) || ip6->src_address.as_u64[1] != map_get_sfx_net (ctx->d, ip4_sadr, @@ -88,7 +88,7 @@ ip6_to_ip4_set_inner_icmp_cb (ip6_header_t * ip6, ip4_header_t * ip4, u32 inner_ip4_dadr; //Security check of inner packet - inner_ip4_dadr = map_get_ip4 (&ip6->dst_address, ctx->d->flags); + inner_ip4_dadr = map_get_ip4 (&ip6->dst_address, ctx->d->ip6_src_len); if (ip6->dst_address.as_u64[0] != map_get_pfx_net (ctx->d, inner_ip4_dadr, ctx->sender_port) || ip6->dst_address.as_u64[1] != map_get_sfx_net (ctx->d, @@ -305,6 +305,8 @@ ip6_map_t_fragmented (vlib_main_t * vm, /* * Translate IPv6 UDP/TCP packet to IPv4. + * Returns 0 on success. + * Returns a non-zero error code on error. */ always_inline int map_ip6_to_ip4_tcp_udp (vlib_main_t * vm, vlib_buffer_t * p, @@ -370,6 +372,16 @@ map_ip6_to_ip4_tcp_udp (vlib_main_t * vm, vlib_buffer_t * p, ip4->dst_address.as_u32 = vnet_buffer (p)->map_t.v6.daddr; ip4->src_address.as_u32 = vnet_buffer (p)->map_t.v6.saddr; + /* + * Drop spoofed packets that from a known domain source. + */ + u32 map_domain_index = -1; + u8 error = 0; + + ip4_map_get_domain (&ip4->src_address, &map_domain_index, &error); + if (error) + return error; + ip4->ip_version_and_header_length = IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS; ip4->tos = ip6_translate_tos (ip6->ip_version_traffic_class_and_flow_label); diff --git a/src/plugins/map/test/test_map_br.py b/src/plugins/map/test/test_map_br.py new file mode 100644 index 00000000000..7869e5f24f1 --- /dev/null +++ b/src/plugins/map/test/test_map_br.py @@ -0,0 +1,265 @@ +#!/usr/bin/env python3 + +import ipaddress +import unittest + +from framework import VppTestCase, VppTestRunner +from vpp_ip import DpoProto +from vpp_ip_route import VppIpRoute, VppRoutePath +from util import fragment_rfc791, fragment_rfc8200 + +import scapy.compat +from scapy.layers.l2 import Ether +from scapy.packet import Raw +from scapy.layers.inet import IP, UDP, ICMP, TCP +from scapy.layers.inet6 import IPv6, ICMPv6TimeExceeded, IPv6ExtHdrFragment +from scapy.layers.inet6 import ICMPv6EchoRequest, ICMPv6EchoReply + + +class TestMAPBR(VppTestCase): + """ MAP-T Test Cases """ + + @classmethod + def setUpClass(cls): + super(TestMAPBR, cls).setUpClass() + + @classmethod + def tearDownClass(cls): + super(TestMAPBR, cls).tearDownClass() + + def setUp(self): + super(TestMAPBR, self).setUp() + + # + # Create 2 pg interfaces. + # pg0 is IPv4 + # pg1 is IPv6 + # + self.create_pg_interfaces(range(2)) + + self.pg0.admin_up() + self.pg0.config_ip4() + self.pg1.generate_remote_hosts(20) + self.pg1.configure_ipv4_neighbors() + self.pg0.resolve_arp() + + self.pg1.admin_up() + self.pg1.config_ip6() + self.pg1.generate_remote_hosts(20) + self.pg1.configure_ipv6_neighbors() + + # + # BR configuration parameters used for all test. + # + self.ip4_prefix = '198.18.0.0/24' + self.ip6_prefix = '2001:db8:f0::/48' + self.ip6_src = '2001:db8:ffff:ff00::/64' + self.ea_bits_len = 12 + self.psid_offset = 6 + self.psid_length = 4 + self.mtu = 1500 + self.tag = 'MAP-T BR' + + self.ipv4_internet_address = self.pg0.remote_ip4 + self.ipv4_map_address = "198.18.0.12" + self.ipv4_udp_or_tcp_internet_port = 65000 + self.ipv4_udp_or_tcp_map_port = 16606 + + self.ipv6_cpe_address = "2001:db8:f0:c30:0:c612:c:3" # 198.18.0.12 + self.ipv6_spoof_address = "2001:db8:f0:c30:0:c612:1c:3" # 198.18.0.28 + self.ipv6_spoof_prefix = "2001:db8:f0:c30:0:a00:c:3" # 10.0.0.12 + self.ipv6_spoof_psid = "2001:db8:f0:c30:0:c612:c:4" # 4 + self.ipv6_spoof_subnet = "2001:db8:f1:c30:0:c612:c:3" # f1 + + self.ipv6_udp_or_tcp_internet_port = 65000 + self.ipv6_udp_or_tcp_map_port = 16606 + self.ipv6_udp_or_tcp_spoof_port = 16862 + + self.ipv6_map_address = ( + "2001:db8:ffff:ff00:ac:1001:200:0") # 176.16.1.2 + self.ipv6_map_same_rule_diff_addr = ( + "2001:db8:ffff:ff00:c6:1200:10:0") # 198.18.0.16 + + self.map_br_prefix = "2001:db8:f0::" + self.map_br_prefix_len = 48 + self.psid_number = 3 + + # + # Add an IPv6 route to the MAP-BR. + # + map_route = VppIpRoute(self, + self.map_br_prefix, + self.map_br_prefix_len, + [VppRoutePath(self.pg1.remote_ip6, + self.pg1.sw_if_index)]) + map_route.add_vpp_config() + + ip4_map_route = VppIpRoute(self, + "198.18.0.0", + 24, + [VppRoutePath(self.pg1.remote_ip4, + self.pg1.sw_if_index)]) + ip4_map_route.add_vpp_config() + + # + # Add a MAP BR domain that maps from pg0 to pg1. + # + self.vapi.map_add_domain(ip4_prefix=self.ip4_prefix, + ip6_prefix=self.ip6_prefix, + ip6_src=self.ip6_src, + ea_bits_len=self.ea_bits_len, + psid_offset=self.psid_offset, + psid_length=self.psid_length, + mtu=self.mtu, + tag=self.tag) + + # + # Set BR parameters. + # + self.vapi.map_param_set_fragmentation(inner=1, ignore_df=0) + self.vapi.map_param_set_fragmentation(inner=0, ignore_df=0) + self.vapi.map_param_set_icmp(ip4_err_relay_src=self.pg0.local_ip4) + self.vapi.map_param_set_traffic_class(copy=1) + + # + # Enable MAP-T on interfaces. + # + self.vapi.map_if_enable_disable(is_enable=1, + sw_if_index=self.pg0.sw_if_index, + is_translation=1) + + self.vapi.map_if_enable_disable(is_enable=1, + sw_if_index=self.pg1.sw_if_index, + is_translation=1) + + self.vapi.map_if_enable_disable(is_enable=1, + sw_if_index=self.pg1.sw_if_index, + is_translation=1) + + def tearDown(self): + super(TestMAPBR, self).tearDown() + for i in self.pg_interfaces: + i.unconfig_ip4() + i.unconfig_ip6() + i.admin_down() + + # + # Spoofed IPv4 Source Address v6 -> v4 direction + # Send a packet with a wrong IPv4 address embedded in bits 72-103. + # The BR should either drop the packet, or rewrite the spoofed + # source IPv4 as the actual source IPv4 address. + # The BR really should drop the packet. + # + + def test_map_t_spoof_ipv4_src_addr_ip6_to_ip4(self): + """ MAP-T spoof ipv4 src addr IPv6 -> IPv4 """ + + eth = Ether(src=self.pg1.remote_mac, + dst=self.pg1.local_mac) + ip = IPv6(src=self.ipv6_spoof_address, + dst=self.ipv6_map_address) + udp = UDP(sport=self.ipv6_udp_or_tcp_map_port, + dport=self.ipv6_udp_or_tcp_internet_port) + payload = "a" * 82 + tx_pkt = eth / ip / udp / payload + + self.pg_send(self.pg1, tx_pkt * 1) + + self.pg0.get_capture(0, timeout=1) + self.pg0.assert_nothing_captured("Should drop IPv4 spoof address") + + # + # Spoofed IPv4 Source Prefix v6 -> v4 direction + # Send a packet with a wrong IPv4 prefix embedded in bits 72-103. + # The BR should either drop the packet, or rewrite the source IPv4 + # to the prefix that matches the source IPv4 address. + # + + def test_map_t_spoof_ipv4_src_prefix_ip6_to_ip4(self): + """ MAP-T spoof ipv4 src prefix IPv6 -> IPv4 """ + + eth = Ether(src=self.pg1.remote_mac, + dst=self.pg1.local_mac) + ip = IPv6(src=self.ipv6_spoof_prefix, + dst=self.ipv6_map_address) + udp = UDP(sport=self.ipv6_udp_or_tcp_map_port, + dport=self.ipv6_udp_or_tcp_internet_port) + payload = "a" * 82 + tx_pkt = eth / ip / udp / payload + + self.pg_send(self.pg1, tx_pkt * 1) + + self.pg0.get_capture(0, timeout=1) + self.pg0.assert_nothing_captured("Should drop IPv4 spoof prefix") + + # + # Spoofed IPv6 PSID v6 -> v4 direction + # Send a packet with a wrong IPv6 port PSID + # The BR should drop the packet. + # + + def test_map_t_spoof_psid_ip6_to_ip4(self): + """ MAP-T spoof psid IPv6 -> IPv4 """ + + eth = Ether(src=self.pg1.remote_mac, + dst=self.pg1.local_mac) + ip = IPv6(src=self.ipv6_spoof_psid, + dst=self.ipv6_map_address) + udp = UDP(sport=self.ipv6_udp_or_tcp_map_port, + dport=self.ipv6_udp_or_tcp_internet_port) + payload = "a" * 82 + tx_pkt = eth / ip / udp / payload + + self.pg_send(self.pg1, tx_pkt * 1) + + self.pg0.get_capture(0, timeout=1) + self.pg0.assert_nothing_captured("Should drop IPv6 spoof PSID") + + # + # Spoofed IPv6 subnet field v6 -> v4 direction + # Send a packet with a wrong IPv6 subnet as "2001:db8:f1" + # The BR should drop the packet. + # + + def test_map_t_spoof_subnet_ip6_to_ip4(self): + """ MAP-T spoof subnet IPv6 -> IPv4 """ + + eth = Ether(src=self.pg1.remote_mac, + dst=self.pg1.local_mac) + ip = IPv6(src=self.ipv6_spoof_subnet, + dst=self.ipv6_map_address) + udp = UDP(sport=self.ipv6_udp_or_tcp_map_port, + dport=self.ipv6_udp_or_tcp_internet_port) + payload = "a" * 82 + tx_pkt = eth / ip / udp / payload + + self.pg_send(self.pg1, tx_pkt * 1) + + self.pg0.get_capture(0, timeout=1) + self.pg0.assert_nothing_captured("Should drop IPv6 spoof subnet") + + # + # Spoofed IPv6 port PSID v6 -> v4 direction + # Send a packet with a wrong IPv6 port PSID + # The BR should drop the packet. + # + + def test_map_t_spoof_port_psid_ip6_to_ip4(self): + """ MAP-T spoof port psid IPv6 -> IPv4 """ + + eth = Ether(src=self.pg1.remote_mac, + dst=self.pg1.local_mac) + ip = IPv6(src=self.ipv6_cpe_address, + dst=self.ipv6_map_address) + udp = UDP(sport=self.ipv6_udp_or_tcp_spoof_port, + dport=self.ipv6_udp_or_tcp_internet_port) + payload = "a" * 82 + tx_pkt = eth / ip / udp / payload + + self.pg_send(self.pg1, tx_pkt * 1) + + self.pg0.get_capture(0, timeout=1) + self.pg0.assert_nothing_captured("Should drop IPv6 spoof port PSID") + +if __name__ == '__main__': + unittest.main(testRunner=VppTestRunner) |