Line data Source code
1 : /*
2 : * node.c: ipip packet processing
3 : *
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:
8 : *
9 : * http://www.apache.org/licenses/LICENSE-2.0
10 : *
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.
16 : */
17 :
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>
24 :
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")
31 :
32 : typedef enum
33 : {
34 : #define _(s, n) IPIP_INPUT_NEXT_##s,
35 : foreach_ipip_input_next
36 : #undef _
37 : IPIP_INPUT_N_NEXT,
38 : } ipip_input_next_t;
39 :
40 : typedef struct
41 : {
42 : u32 tunnel_id;
43 : u32 length;
44 : ip46_address_t src;
45 : ip46_address_t dst;
46 : u8 is_ipv6;
47 : } ipip_rx_trace_t;
48 :
49 : static u8 *
50 3193 : format_ipip_rx_trace (u8 * s, va_list * args)
51 : {
52 3193 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
53 3193 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
54 3193 : ipip_rx_trace_t *t = va_arg (*args, ipip_rx_trace_t *);
55 :
56 3193 : s = format (s, "IPIP: tunnel %d len %d src %U dst %U", t->tunnel_id,
57 3193 : clib_net_to_host_u16 (t->length), format_ip46_address, &t->src,
58 : IP46_TYPE_ANY, format_ip46_address, &t->dst, IP46_TYPE_ANY);
59 3193 : return s;
60 : }
61 :
62 : always_inline uword
63 99 : ipip_input (vlib_main_t * vm, vlib_node_runtime_t * node,
64 : vlib_frame_t * from_frame, bool is_ipv6)
65 : {
66 99 : ipip_main_t *gm = &ipip_main;
67 : u32 n_left_from, next_index, *from, *to_next, n_left_to_next;
68 99 : u32 tunnel_sw_if_index = ~0;
69 99 : u32 thread_index = vm->thread_index;
70 : u32 len;
71 99 : vnet_interface_main_t *im = &gm->vnet_main->interface_main;
72 :
73 99 : from = vlib_frame_vector_args (from_frame);
74 99 : n_left_from = from_frame->n_vectors;
75 99 : next_index = node->cached_next_index;
76 198 : while (n_left_from > 0)
77 : {
78 99 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
79 :
80 6219 : while (n_left_from > 0 && n_left_to_next > 0)
81 : {
82 : u32 bi0;
83 : vlib_buffer_t *b0;
84 : ip4_header_t *ip40;
85 : ip6_header_t *ip60;
86 6120 : u32 next0 = IPIP_INPUT_NEXT_DROP;
87 : u8 inner_protocol0;
88 :
89 6120 : bi0 = to_next[0] = from[0];
90 6120 : from += 1;
91 6120 : n_left_from -= 1;
92 6120 : to_next += 1;
93 6120 : n_left_to_next -= 1;
94 :
95 6120 : b0 = vlib_get_buffer (vm, bi0);
96 :
97 6120 : ipip_tunnel_key_t key0 = {
98 6120 : .fib_index = vnet_buffer (b0)->ip.fib_index,
99 : .mode = IPIP_MODE_P2P,
100 : };
101 :
102 6120 : if (is_ipv6)
103 : {
104 2459 : ip60 = vlib_buffer_get_current (b0);
105 : /* Check for outer fragmentation */
106 2459 : if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
107 : {
108 0 : next0 = IPIP_INPUT_NEXT_DROP;
109 0 : b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET];
110 0 : goto drop;
111 : }
112 :
113 2459 : vlib_buffer_advance (b0, sizeof (*ip60));
114 2459 : ip_set (&key0.dst, &ip60->src_address, false);
115 2459 : ip_set (&key0.src, &ip60->dst_address, false);
116 2459 : inner_protocol0 = ip60->protocol;
117 2459 : key0.transport = IPIP_TRANSPORT_IP6;
118 : }
119 : else
120 : {
121 3661 : ip40 = vlib_buffer_get_current (b0);
122 : /* Check for outer fragmentation */
123 3661 : if (ip40->flags_and_fragment_offset &
124 3661 : clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS))
125 : {
126 0 : next0 = IPIP_INPUT_NEXT_DROP;
127 0 : b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET];
128 0 : goto drop;
129 : }
130 3661 : vlib_buffer_advance (b0, sizeof (*ip40));
131 3661 : ip_set (&key0.dst, &ip40->src_address, true);
132 3661 : ip_set (&key0.src, &ip40->dst_address, true);
133 3661 : inner_protocol0 = ip40->protocol;
134 3661 : key0.transport = IPIP_TRANSPORT_IP4;
135 : }
136 :
137 : /*
138 : * Find tunnel. First a lookup for P2P tunnels, then a lookup
139 : * for multipoint tunnels
140 : */
141 6120 : ipip_tunnel_t *t0 = ipip_tunnel_db_find (&key0);
142 6120 : if (!t0)
143 : {
144 458 : ip46_address_reset (&key0.dst);
145 458 : key0.mode = IPIP_MODE_6RD;
146 458 : t0 = ipip_tunnel_db_find (&key0);
147 458 : if (!t0)
148 : {
149 378 : next0 = IPIP_INPUT_NEXT_DROP;
150 378 : b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
151 378 : goto drop;
152 : }
153 : }
154 5742 : tunnel_sw_if_index = t0->sw_if_index;
155 :
156 5742 : len = vlib_buffer_length_in_chain (vm, b0);
157 5742 : vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
158 :
159 5742 : if (inner_protocol0 == IP_PROTOCOL_IPV6)
160 : {
161 2465 : next0 = IPIP_INPUT_NEXT_IP6_INPUT;
162 :
163 2465 : if (is_ipv6)
164 1881 : tunnel_decap_fixup_6o6 (t0->flags, (ip60 + 1), ip60);
165 : else
166 584 : tunnel_decap_fixup_6o4 (t0->flags,
167 584 : (ip6_header_t *) (ip40 + 1), ip40);
168 : }
169 3277 : else if (inner_protocol0 == IP_PROTOCOL_IP_IN_IP)
170 : {
171 3151 : next0 = IPIP_INPUT_NEXT_IP4_INPUT;
172 :
173 3151 : if (is_ipv6)
174 515 : tunnel_decap_fixup_4o6 (t0->flags,
175 515 : (ip4_header_t *) (ip60 + 1), ip60);
176 : else
177 2636 : tunnel_decap_fixup_4o4 (t0->flags, ip40 + 1, ip40);
178 : }
179 126 : else if (inner_protocol0 == IP_PROTOCOL_MPLS_IN_IP)
180 : {
181 126 : next0 = IPIP_INPUT_NEXT_MPLS_INPUT;
182 :
183 126 : if (is_ipv6)
184 63 : tunnel_decap_fixup_mplso6 (
185 63 : t0->flags, (mpls_unicast_header_t *) (ip60 + 1), ip60);
186 : else
187 63 : tunnel_decap_fixup_mplso4 (
188 63 : t0->flags, (mpls_unicast_header_t *) ip40 + 1, ip40);
189 : }
190 :
191 5742 : if (!is_ipv6 && t0->mode == IPIP_MODE_6RD
192 80 : && t0->sixrd.security_check)
193 : {
194 70 : ip6_header_t *inner_ip60 = vlib_buffer_get_current (b0);
195 70 : if (sixrd_get_addr_net (t0, inner_ip60->src_address.as_u64[0])
196 70 : != ip40->src_address.as_u32)
197 : {
198 10 : next0 = IPIP_INPUT_NEXT_DROP;
199 10 : b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
200 10 : goto drop;
201 : }
202 : }
203 :
204 5732 : vlib_increment_combined_counter (im->combined_sw_if_counters +
205 : VNET_INTERFACE_COUNTER_RX,
206 : thread_index, tunnel_sw_if_index,
207 : 1 /* packets */ ,
208 : len /* bytes */ );
209 :
210 6120 : drop:
211 6120 : if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
212 : {
213 : ipip_rx_trace_t *tr =
214 4788 : vlib_add_trace (vm, node, b0, sizeof (*tr));
215 4788 : tr->tunnel_id = tunnel_sw_if_index;
216 4788 : if (is_ipv6)
217 : {
218 1793 : tr->length = ip60->payload_length;
219 1793 : tr->src.ip6.as_u64[0] = ip60->src_address.as_u64[0];
220 1793 : tr->src.ip6.as_u64[1] = ip60->src_address.as_u64[1];
221 1793 : tr->dst.ip6.as_u64[0] = ip60->dst_address.as_u64[0];
222 1793 : tr->dst.ip6.as_u64[1] = ip60->dst_address.as_u64[1];
223 : }
224 : else
225 : {
226 2995 : tr->length = ip40->length;
227 2995 : tr->src.ip4.as_u32 = ip40->src_address.as_u32;
228 2995 : tr->dst.ip4.as_u32 = ip40->dst_address.as_u32;
229 : }
230 : }
231 :
232 6120 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
233 : n_left_to_next, bi0, next0);
234 : }
235 :
236 99 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
237 : }
238 99 : vlib_node_increment_counter (vm,
239 99 : !is_ipv6 ? ipip4_input_node.index :
240 : ipip6_input_node.index, IPIP_ERROR_DECAP_PKTS,
241 99 : from_frame->n_vectors);
242 99 : return from_frame->n_vectors;
243 : }
244 :
245 2298 : VLIB_NODE_FN (ipip4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
246 : vlib_frame_t * from_frame)
247 : {
248 62 : return ipip_input (vm, node, from_frame, /* is_ip6 */ false);
249 : }
250 :
251 2273 : VLIB_NODE_FN (ipip6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
252 : vlib_frame_t * from_frame)
253 : {
254 37 : return ipip_input (vm, node, from_frame, /* is_ip6 */ true);
255 : }
256 :
257 : static char *ipip_error_strings[] = {
258 : #define _(sym,string) string,
259 : foreach_ipip_error
260 : #undef _
261 : };
262 :
263 : /* *INDENT-OFF* */
264 178120 : 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,
271 : .next_nodes =
272 : {
273 : #define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
274 : foreach_ipip_input_next
275 : #undef _
276 : },
277 : .format_trace = format_ipip_rx_trace,
278 : };
279 :
280 178120 : 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,
287 : .next_nodes =
288 : {
289 : #define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
290 : foreach_ipip_input_next
291 : #undef _
292 : },
293 : .format_trace = format_ipip_rx_trace,
294 : };
295 :
296 : /* *INDENT-ON* */
297 :
298 : /*
299 : * fd.io coding-style-patch-verification: ON
300 : *
301 : * Local Variables:
302 : * eval: (c-set-style "gnu")
303 : * End:
304 : */
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