Line data Source code
1 : /*
2 : * ipsec_output.c : IPSec output node
3 : *
4 : * Copyright (c) 2015 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 agreed 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 <vnet/vnet.h>
19 : #include <vnet/api_errno.h>
20 : #include <vnet/ip/ip.h>
21 :
22 : #include <vnet/ipsec/ipsec.h>
23 : #include <vnet/ipsec/ipsec_io.h>
24 : #include <vnet/ipsec/ipsec_output.h>
25 :
26 : #define foreach_ipsec_output_error \
27 : _(RX_PKTS, "IPSec pkts received") \
28 : _(POLICY_DISCARD, "IPSec policy discard") \
29 : _(POLICY_NO_MATCH, "IPSec policy (no match)") \
30 : _(POLICY_PROTECT, "IPSec policy protect") \
31 : _(POLICY_BYPASS, "IPSec policy bypass") \
32 : _(ENCAPS_FAILED, "IPSec encapsulation failed")
33 :
34 : typedef enum
35 : {
36 : #define _(sym,str) IPSEC_OUTPUT_ERROR_##sym,
37 : foreach_ipsec_output_error
38 : #undef _
39 : IPSEC_DECAP_N_ERROR,
40 : } ipsec_output_error_t;
41 :
42 : static char *ipsec_output_error_strings[] = {
43 : #define _(sym,string) string,
44 : foreach_ipsec_output_error
45 : #undef _
46 : };
47 :
48 : typedef struct
49 : {
50 : u32 spd_id;
51 : u32 policy_id;
52 : } ipsec_output_trace_t;
53 :
54 : /* packet trace format function */
55 : static u8 *
56 176473 : format_ipsec_output_trace (u8 * s, va_list * args)
57 : {
58 176473 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
59 176473 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
60 176473 : ipsec_output_trace_t *t = va_arg (*args, ipsec_output_trace_t *);
61 :
62 176473 : s = format (s, "spd %u policy %d", t->spd_id, t->policy_id);
63 :
64 176473 : return s;
65 : }
66 :
67 : static inline uword
68 6766 : ipsec_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
69 : vlib_frame_t * from_frame, int is_ipv6)
70 : {
71 6766 : ipsec_main_t *im = &ipsec_main;
72 :
73 6766 : u32 *from, *to_next = 0, thread_index;
74 6766 : u32 n_left_from, sw_if_index0, last_sw_if_index = (u32) ~ 0;
75 6766 : u32 next_node_index = (u32) ~ 0, last_next_node_index = (u32) ~ 0;
76 6766 : vlib_frame_t *f = 0;
77 6766 : u32 spd_index0 = ~0;
78 6766 : ipsec_spd_t *spd0 = 0;
79 : int bogus;
80 6766 : u64 nc_protect = 0, nc_bypass = 0, nc_discard = 0, nc_nomatch = 0;
81 6766 : u8 flow_cache_enabled = im->output_flow_cache_flag;
82 :
83 6766 : from = vlib_frame_vector_args (from_frame);
84 6766 : n_left_from = from_frame->n_vectors;
85 6766 : thread_index = vm->thread_index;
86 :
87 278503 : while (n_left_from > 0)
88 : {
89 : u32 bi0, pi0, bi1;
90 : vlib_buffer_t *b0, *b1;
91 271737 : ipsec_policy_t *p0 = NULL;
92 : ip4_header_t *ip0;
93 271737 : ip6_header_t *ip6_0 = 0;
94 : udp_header_t *udp0;
95 271737 : u32 iph_offset = 0;
96 : tcp_header_t *tcp0;
97 : u64 bytes0;
98 :
99 271737 : bi0 = from[0];
100 271737 : b0 = vlib_get_buffer (vm, bi0);
101 271737 : if (n_left_from > 1)
102 : {
103 264971 : bi1 = from[1];
104 264971 : b1 = vlib_get_buffer (vm, bi1);
105 264971 : CLIB_PREFETCH (b1, CLIB_CACHE_LINE_BYTES * 2, STORE);
106 264971 : vlib_prefetch_buffer_data (b1, LOAD);
107 : }
108 271737 : sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
109 271737 : iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
110 271737 : ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
111 : + iph_offset);
112 :
113 : /* lookup for SPD only if sw_if_index is changed */
114 271737 : if (PREDICT_FALSE (last_sw_if_index != sw_if_index0))
115 : {
116 6972 : uword *p = hash_get (im->spd_index_by_sw_if_index, sw_if_index0);
117 6972 : ALWAYS_ASSERT (p);
118 6972 : spd_index0 = p[0];
119 6972 : spd0 = pool_elt_at_index (im->spds, spd_index0);
120 6972 : last_sw_if_index = sw_if_index0;
121 : }
122 :
123 271737 : if (is_ipv6)
124 : {
125 87750 : ip6_0 = (ip6_header_t *) ((u8 *) vlib_buffer_get_current (b0)
126 : + iph_offset);
127 :
128 87750 : udp0 = ip6_next_header (ip6_0);
129 : #if 0
130 : clib_warning
131 : ("packet received from %U port %u to %U port %u spd_id %u",
132 : format_ip6_address, &ip6_0->src_address,
133 : clib_net_to_host_u16 (udp0->src_port), format_ip6_address,
134 : &ip6_0->dst_address, clib_net_to_host_u16 (udp0->dst_port),
135 : spd0->id);
136 : #endif
137 :
138 87750 : p0 = ipsec6_output_policy_match (spd0,
139 : &ip6_0->src_address,
140 : &ip6_0->dst_address,
141 87750 : clib_net_to_host_u16
142 87750 : (udp0->src_port),
143 87750 : clib_net_to_host_u16
144 87750 : (udp0->dst_port), ip6_0->protocol);
145 : }
146 : else
147 : {
148 183987 : udp0 = (udp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
149 :
150 : #if 0
151 : clib_warning ("packet received from %U to %U port %u",
152 : format_ip4_address, ip0->src_address.as_u8,
153 : format_ip4_address, ip0->dst_address.as_u8,
154 : clib_net_to_host_u16 (udp0->dst_port));
155 : clib_warning ("sw_if_index0 %u spd_index0 %u spd_id %u",
156 : sw_if_index0, spd_index0, spd0->id);
157 : #endif
158 :
159 : /*
160 : * Check whether flow cache is enabled.
161 : */
162 183987 : if (flow_cache_enabled)
163 : {
164 67 : p0 = ipsec4_out_spd_find_flow_cache_entry (
165 67 : im, ip0->protocol, ip0->src_address.as_u32,
166 67 : ip0->dst_address.as_u32, udp0->src_port, udp0->dst_port);
167 : }
168 :
169 : /* Fall back to linear search if flow cache lookup fails */
170 183987 : if (p0 == NULL)
171 : {
172 183937 : p0 = ipsec_output_policy_match (
173 183937 : spd0, ip0->protocol,
174 : clib_net_to_host_u32 (ip0->src_address.as_u32),
175 : clib_net_to_host_u32 (ip0->dst_address.as_u32),
176 183937 : clib_net_to_host_u16 (udp0->src_port),
177 183937 : clib_net_to_host_u16 (udp0->dst_port), flow_cache_enabled);
178 : }
179 : }
180 271737 : tcp0 = (void *) udp0;
181 :
182 271737 : if (PREDICT_TRUE (p0 != NULL))
183 : {
184 271335 : pi0 = p0 - im->policies;
185 :
186 271335 : vlib_prefetch_combined_counter (&ipsec_spd_policy_counters,
187 : thread_index, pi0);
188 :
189 271335 : if (is_ipv6)
190 : {
191 87353 : bytes0 = clib_net_to_host_u16 (ip6_0->payload_length);
192 87353 : bytes0 += sizeof (ip6_header_t);
193 : }
194 : else
195 : {
196 183982 : bytes0 = clib_net_to_host_u16 (ip0->length);
197 : }
198 :
199 271335 : if (p0->policy == IPSEC_POLICY_ACTION_PROTECT)
200 : {
201 207714 : ipsec_sa_t *sa = 0;
202 207714 : nc_protect++;
203 207714 : sa = ipsec_sa_get (p0->sa_index);
204 207714 : if (sa->protocol == IPSEC_PROTOCOL_ESP)
205 203871 : if (is_ipv6)
206 55901 : next_node_index = im->esp6_encrypt_node_index;
207 : else
208 147970 : next_node_index = im->esp4_encrypt_node_index;
209 3843 : else if (is_ipv6)
210 1911 : next_node_index = im->ah6_encrypt_node_index;
211 : else
212 1932 : next_node_index = im->ah4_encrypt_node_index;
213 207714 : vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
214 :
215 207714 : if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_OFFLOAD))
216 : {
217 2 : vnet_buffer_oflags_t oflags = vnet_buffer (b0)->oflags;
218 :
219 : /*
220 : * Clearing offload flags before checksum is computed
221 : * It guarantees the cache hit!
222 : */
223 2 : vnet_buffer_offload_flags_clear (b0, oflags);
224 :
225 2 : if (is_ipv6)
226 : {
227 0 : if (PREDICT_FALSE (oflags &
228 : VNET_BUFFER_OFFLOAD_F_TCP_CKSUM))
229 : {
230 0 : tcp0->checksum = ip6_tcp_udp_icmp_compute_checksum (
231 : vm, b0, ip6_0, &bogus);
232 : }
233 0 : if (PREDICT_FALSE (oflags &
234 : VNET_BUFFER_OFFLOAD_F_UDP_CKSUM))
235 : {
236 0 : udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (
237 : vm, b0, ip6_0, &bogus);
238 : }
239 : }
240 : else
241 : {
242 2 : if (PREDICT_FALSE (oflags &
243 : VNET_BUFFER_OFFLOAD_F_IP_CKSUM))
244 : {
245 2 : ip0->checksum = ip4_header_checksum (ip0);
246 : }
247 2 : if (PREDICT_FALSE (oflags &
248 : VNET_BUFFER_OFFLOAD_F_TCP_CKSUM))
249 : {
250 2 : tcp0->checksum =
251 2 : ip4_tcp_udp_compute_checksum (vm, b0, ip0);
252 : }
253 2 : if (PREDICT_FALSE (oflags &
254 : VNET_BUFFER_OFFLOAD_F_UDP_CKSUM))
255 : {
256 0 : udp0->checksum =
257 0 : ip4_tcp_udp_compute_checksum (vm, b0, ip0);
258 : }
259 : }
260 : }
261 207714 : vlib_buffer_advance (b0, iph_offset);
262 : }
263 63621 : else if (p0->policy == IPSEC_POLICY_ACTION_BYPASS)
264 : {
265 63567 : nc_bypass++;
266 63567 : next_node_index = get_next_output_feature_node_index (b0, node);
267 : }
268 : else
269 : {
270 54 : nc_discard++;
271 54 : next_node_index = im->error_drop_node_index;
272 : }
273 271335 : vlib_increment_combined_counter
274 : (&ipsec_spd_policy_counters, thread_index, pi0, 1, bytes0);
275 : }
276 : else
277 : {
278 402 : pi0 = ~0;
279 402 : nc_nomatch++;
280 402 : next_node_index = im->error_drop_node_index;
281 : }
282 :
283 271737 : from += 1;
284 271737 : n_left_from -= 1;
285 :
286 271737 : if (PREDICT_FALSE ((last_next_node_index != next_node_index) || f == 0))
287 : {
288 : /* if this is not 1st frame */
289 6771 : if (f)
290 5 : vlib_put_frame_to_node (vm, last_next_node_index, f);
291 :
292 6771 : last_next_node_index = next_node_index;
293 :
294 6771 : f = vlib_get_frame_to_node (vm, next_node_index);
295 :
296 : /* frame->frame_flags, copy it from node */
297 : /* Copy trace flag from next_frame and from runtime. */
298 6771 : f->frame_flags |= node->flags & VLIB_NODE_FLAG_TRACE;
299 :
300 6771 : to_next = vlib_frame_vector_args (f);
301 : }
302 :
303 271737 : to_next[0] = bi0;
304 271737 : to_next += 1;
305 271737 : f->n_vectors++;
306 :
307 271737 : if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
308 224902 : PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
309 : {
310 : ipsec_output_trace_t *tr =
311 224838 : vlib_add_trace (vm, node, b0, sizeof (*tr));
312 224838 : if (spd0)
313 224838 : tr->spd_id = spd0->id;
314 224838 : tr->policy_id = pi0;
315 : }
316 : }
317 :
318 6766 : vlib_put_frame_to_node (vm, next_node_index, f);
319 6766 : vlib_node_increment_counter (vm, node->node_index,
320 : IPSEC_OUTPUT_ERROR_POLICY_PROTECT, nc_protect);
321 6766 : vlib_node_increment_counter (vm, node->node_index,
322 : IPSEC_OUTPUT_ERROR_POLICY_BYPASS, nc_bypass);
323 6766 : vlib_node_increment_counter (vm, node->node_index,
324 : IPSEC_OUTPUT_ERROR_POLICY_DISCARD, nc_discard);
325 6766 : vlib_node_increment_counter (vm, node->node_index,
326 : IPSEC_OUTPUT_ERROR_POLICY_NO_MATCH,
327 : nc_nomatch);
328 6766 : return from_frame->n_vectors;
329 : }
330 :
331 7217 : VLIB_NODE_FN (ipsec4_output_node) (vlib_main_t * vm,
332 : vlib_node_runtime_t * node,
333 : vlib_frame_t * frame)
334 : {
335 4981 : return ipsec_output_inline (vm, node, frame, 0);
336 : }
337 :
338 : /* *INDENT-OFF* */
339 178120 : VLIB_REGISTER_NODE (ipsec4_output_node) = {
340 : .name = "ipsec4-output-feature",
341 : .vector_size = sizeof (u32),
342 : .format_trace = format_ipsec_output_trace,
343 : .type = VLIB_NODE_TYPE_INTERNAL,
344 :
345 : .n_errors = ARRAY_LEN(ipsec_output_error_strings),
346 : .error_strings = ipsec_output_error_strings,
347 :
348 : .n_next_nodes = IPSEC_OUTPUT_N_NEXT,
349 : .next_nodes = {
350 : #define _(s,n) [IPSEC_OUTPUT_NEXT_##s] = n,
351 : foreach_ipsec_output_next
352 : #undef _
353 : },
354 : };
355 : /* *INDENT-ON* */
356 :
357 4021 : VLIB_NODE_FN (ipsec6_output_node) (vlib_main_t * vm,
358 : vlib_node_runtime_t * node,
359 : vlib_frame_t * frame)
360 : {
361 1785 : return ipsec_output_inline (vm, node, frame, 1);
362 : }
363 :
364 178120 : VLIB_REGISTER_NODE (ipsec6_output_node) = {
365 : .name = "ipsec6-output-feature",
366 : .vector_size = sizeof (u32),
367 : .format_trace = format_ipsec_output_trace,
368 : .type = VLIB_NODE_TYPE_INTERNAL,
369 :
370 : .n_errors = ARRAY_LEN(ipsec_output_error_strings),
371 : .error_strings = ipsec_output_error_strings,
372 :
373 : .n_next_nodes = IPSEC_OUTPUT_N_NEXT,
374 : .next_nodes = {
375 : #define _(s,n) [IPSEC_OUTPUT_NEXT_##s] = n,
376 : foreach_ipsec_output_next
377 : #undef _
378 : },
379 : };
380 :
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