2 * node.c: ipip packet processing
4 * Copyright (c) 2018 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or aipiped to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vlib/vlib.h>
19 #include <vnet/ipip/ipip.h>
20 #include <vnet/ip/ip6_packet.h>
21 #include <vnet/mpls/mpls.h>
22 #include <vnet/tunnel/tunnel_dp.h>
23 #include <vppinfra/sparse_vec.h>
25 #define foreach_ipip_input_next \
26 _ (PUNT, "error-punt") \
27 _ (DROP, "error-drop") \
28 _ (IP4_INPUT, "ip4-input") \
29 _ (IP6_INPUT, "ip6-input") \
30 _ (MPLS_INPUT, "mpls-input")
34 #define _(s, n) IPIP_INPUT_NEXT_##s,
35 foreach_ipip_input_next
50 format_ipip_rx_trace (u8 * s, va_list * args)
52 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
53 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
54 ipip_rx_trace_t *t = va_arg (*args, ipip_rx_trace_t *);
56 s = format (s, "IPIP: tunnel %d len %d src %U dst %U", t->tunnel_id,
57 clib_net_to_host_u16 (t->length), format_ip46_address, &t->src,
58 IP46_TYPE_ANY, format_ip46_address, &t->dst, IP46_TYPE_ANY);
63 ipip_input (vlib_main_t * vm, vlib_node_runtime_t * node,
64 vlib_frame_t * from_frame, bool is_ipv6)
66 ipip_main_t *gm = &ipip_main;
67 u32 n_left_from, next_index, *from, *to_next, n_left_to_next;
68 u32 tunnel_sw_if_index = ~0;
69 u32 thread_index = vm->thread_index;
71 vnet_interface_main_t *im = &gm->vnet_main->interface_main;
73 from = vlib_frame_vector_args (from_frame);
74 n_left_from = from_frame->n_vectors;
75 next_index = node->cached_next_index;
76 while (n_left_from > 0)
78 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
80 while (n_left_from > 0 && n_left_to_next > 0)
86 u32 next0 = IPIP_INPUT_NEXT_DROP;
89 bi0 = to_next[0] = from[0];
95 b0 = vlib_get_buffer (vm, bi0);
97 ipip_tunnel_key_t key0 = {
98 .fib_index = vnet_buffer (b0)->ip.fib_index,
99 .mode = IPIP_MODE_P2P,
104 ip60 = vlib_buffer_get_current (b0);
105 /* Check for outer fragmentation */
106 if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
108 next0 = IPIP_INPUT_NEXT_DROP;
109 b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET];
113 vlib_buffer_advance (b0, sizeof (*ip60));
114 ip_set (&key0.dst, &ip60->src_address, false);
115 ip_set (&key0.src, &ip60->dst_address, false);
116 inner_protocol0 = ip60->protocol;
117 key0.transport = IPIP_TRANSPORT_IP6;
121 ip40 = vlib_buffer_get_current (b0);
122 /* Check for outer fragmentation */
123 if (ip40->flags_and_fragment_offset &
124 clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS))
126 next0 = IPIP_INPUT_NEXT_DROP;
127 b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET];
130 vlib_buffer_advance (b0, sizeof (*ip40));
131 ip_set (&key0.dst, &ip40->src_address, true);
132 ip_set (&key0.src, &ip40->dst_address, true);
133 inner_protocol0 = ip40->protocol;
134 key0.transport = IPIP_TRANSPORT_IP4;
138 * Find tunnel. First a lookup for P2P tunnels, then a lookup
139 * for multipoint tunnels
141 ipip_tunnel_t *t0 = ipip_tunnel_db_find (&key0);
144 ip46_address_reset (&key0.dst);
145 key0.mode = IPIP_MODE_6RD;
146 t0 = ipip_tunnel_db_find (&key0);
149 next0 = IPIP_INPUT_NEXT_DROP;
150 b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
154 tunnel_sw_if_index = t0->sw_if_index;
156 len = vlib_buffer_length_in_chain (vm, b0);
157 vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
159 if (inner_protocol0 == IP_PROTOCOL_IPV6)
161 next0 = IPIP_INPUT_NEXT_IP6_INPUT;
164 tunnel_decap_fixup_6o6 (t0->flags, (ip60 + 1), ip60);
166 tunnel_decap_fixup_6o4 (t0->flags,
167 (ip6_header_t *) (ip40 + 1), ip40);
169 else if (inner_protocol0 == IP_PROTOCOL_IP_IN_IP)
171 next0 = IPIP_INPUT_NEXT_IP4_INPUT;
174 tunnel_decap_fixup_4o6 (t0->flags,
175 (ip4_header_t *) (ip60 + 1), ip60);
177 tunnel_decap_fixup_4o4 (t0->flags, ip40 + 1, ip40);
179 else if (inner_protocol0 == IP_PROTOCOL_MPLS_IN_IP)
181 next0 = IPIP_INPUT_NEXT_MPLS_INPUT;
184 tunnel_decap_fixup_mplso6 (
185 t0->flags, (mpls_unicast_header_t *) (ip60 + 1), ip60);
187 tunnel_decap_fixup_mplso4 (
188 t0->flags, (mpls_unicast_header_t *) ip40 + 1, ip40);
191 if (!is_ipv6 && t0->mode == IPIP_MODE_6RD
192 && t0->sixrd.security_check)
194 ip6_header_t *inner_ip60 = vlib_buffer_get_current (b0);
195 if (sixrd_get_addr_net (t0, inner_ip60->src_address.as_u64[0])
196 != ip40->src_address.as_u32)
198 next0 = IPIP_INPUT_NEXT_DROP;
199 b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
204 vlib_increment_combined_counter (im->combined_sw_if_counters +
205 VNET_INTERFACE_COUNTER_RX,
206 thread_index, tunnel_sw_if_index,
211 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
213 ipip_rx_trace_t *tr =
214 vlib_add_trace (vm, node, b0, sizeof (*tr));
215 tr->tunnel_id = tunnel_sw_if_index;
218 tr->length = ip60->payload_length;
219 tr->src.ip6.as_u64[0] = ip60->src_address.as_u64[0];
220 tr->src.ip6.as_u64[1] = ip60->src_address.as_u64[1];
221 tr->dst.ip6.as_u64[0] = ip60->dst_address.as_u64[0];
222 tr->dst.ip6.as_u64[1] = ip60->dst_address.as_u64[1];
226 tr->length = ip40->length;
227 tr->src.ip4.as_u32 = ip40->src_address.as_u32;
228 tr->dst.ip4.as_u32 = ip40->dst_address.as_u32;
232 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
233 n_left_to_next, bi0, next0);
236 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
238 vlib_node_increment_counter (vm,
239 !is_ipv6 ? ipip4_input_node.index :
240 ipip6_input_node.index, IPIP_ERROR_DECAP_PKTS,
241 from_frame->n_vectors);
242 return from_frame->n_vectors;
245 VLIB_NODE_FN (ipip4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
246 vlib_frame_t * from_frame)
248 return ipip_input (vm, node, from_frame, /* is_ip6 */ false);
251 VLIB_NODE_FN (ipip6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
252 vlib_frame_t * from_frame)
254 return ipip_input (vm, node, from_frame, /* is_ip6 */ true);
257 static char *ipip_error_strings[] = {
258 #define _(sym,string) string,
264 VLIB_REGISTER_NODE(ipip4_input_node) = {
265 .name = "ipip4-input",
266 /* Takes a vector of packets. */
267 .vector_size = sizeof(u32),
268 .n_errors = IPIP_N_ERROR,
269 .error_strings = ipip_error_strings,
270 .n_next_nodes = IPIP_INPUT_N_NEXT,
273 #define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
274 foreach_ipip_input_next
277 .format_trace = format_ipip_rx_trace,
280 VLIB_REGISTER_NODE(ipip6_input_node) = {
281 .name = "ipip6-input",
282 /* Takes a vector of packets. */
283 .vector_size = sizeof(u32),
284 .n_errors = IPIP_N_ERROR,
285 .error_strings = ipip_error_strings,
286 .n_next_nodes = IPIP_INPUT_N_NEXT,
289 #define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
290 foreach_ipip_input_next
293 .format_trace = format_ipip_rx_trace,
299 * fd.io coding-style-patch-verification: ON
302 * eval: (c-set-style "gnu")