FD.io VPP  v18.07-34-g55fbdb9
Vector Packet Processing
ipsec_output.c
Go to the documentation of this file.
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 
24 #if WITH_LIBSSL > 0
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 static vlib_node_registration_t ipsec_output_ip4_node;
49 static vlib_node_registration_t ipsec_output_ip6_node;
50 
51 typedef struct
52 {
53  u32 spd_id;
54 } ipsec_output_trace_t;
55 
56 /* packet trace format function */
57 static u8 *
58 format_ipsec_output_trace (u8 * s, va_list * args)
59 {
60  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
61  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
62  ipsec_output_trace_t *t = va_arg (*args, ipsec_output_trace_t *);
63 
64  if (t->spd_id != ~0)
65  {
66  s = format (s, "spd %u ", t->spd_id);
67  }
68  else
69  {
70  s = format (s, "no spd");
71  }
72  return s;
73 }
74 
76 ipsec_output_policy_match (ipsec_spd_t * spd, u8 pr, u32 la, u32 ra, u16 lp,
77  u16 rp)
78 {
79  ipsec_policy_t *p;
80  u32 *i;
81 
82  if (!spd)
83  return 0;
84 
86  {
87  p = pool_elt_at_index (spd->policies, *i);
88  if (PREDICT_FALSE (p->protocol && (p->protocol != pr)))
89  continue;
90 
91  if (ra < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
92  continue;
93 
94  if (ra > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
95  continue;
96 
97  if (la < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
98  continue;
99 
100  if (la > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
101  continue;
102 
103  if (PREDICT_FALSE
104  ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP)
105  && (pr != IP_PROTOCOL_SCTP)))
106  return p;
107 
108  if (lp < p->lport.start)
109  continue;
110 
111  if (lp > p->lport.stop)
112  continue;
113 
114  if (rp < p->rport.start)
115  continue;
116 
117  if (rp > p->rport.stop)
118  continue;
119 
120  return p;
121  }
122  return 0;
123 }
124 
127  ip6_address_t * ua)
128 {
129  if ((memcmp (a->as_u64, la->as_u64, 2 * sizeof (u64)) >= 0) &&
130  (memcmp (a->as_u64, ua->as_u64, 2 * sizeof (u64)) <= 0))
131  return 1;
132  return 0;
133 }
134 
136 ipsec_output_ip6_policy_match (ipsec_spd_t * spd,
137  ip6_address_t * la,
138  ip6_address_t * ra, u16 lp, u16 rp, u8 pr)
139 {
140  ipsec_policy_t *p;
141  u32 *i;
142 
143  if (!spd)
144  return 0;
145 
147  {
148  p = pool_elt_at_index (spd->policies, *i);
149  if (PREDICT_FALSE (p->protocol && (p->protocol != pr)))
150  continue;
151 
152  if (!ip6_addr_match_range (ra, &p->raddr.start.ip6, &p->raddr.stop.ip6))
153  continue;
154 
155  if (!ip6_addr_match_range (la, &p->laddr.start.ip6, &p->laddr.stop.ip6))
156  continue;
157 
158  if (PREDICT_FALSE
159  ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP)
160  && (pr != IP_PROTOCOL_SCTP)))
161  return p;
162 
163  if (lp < p->lport.start)
164  continue;
165 
166  if (lp > p->lport.stop)
167  continue;
168 
169  if (rp < p->rport.start)
170  continue;
171 
172  if (rp > p->rport.stop)
173  continue;
174 
175  return p;
176  }
177 
178  return 0;
179 }
180 
181 static inline uword
182 ipsec_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
183  vlib_frame_t * from_frame, int is_ipv6)
184 {
185  ipsec_main_t *im = &ipsec_main;
186 
187  u32 *from, *to_next = 0;
188  u32 n_left_from, sw_if_index0, last_sw_if_index = (u32) ~ 0;
189  u32 next_node_index = (u32) ~ 0, last_next_node_index = (u32) ~ 0;
190  vlib_frame_t *f = 0;
191  u32 spd_index0 = ~0;
192  ipsec_spd_t *spd0 = 0;
193  int bogus;
194  u64 nc_protect = 0, nc_bypass = 0, nc_discard = 0, nc_nomatch = 0;
195 
196  from = vlib_frame_vector_args (from_frame);
197  n_left_from = from_frame->n_vectors;
198 
199  while (n_left_from > 0)
200  {
201  u32 bi0;
202  vlib_buffer_t *b0;
203  ipsec_policy_t *p0;
204  ip4_header_t *ip0;
205  ip6_header_t *ip6_0 = 0;
206  udp_header_t *udp0;
207  u32 iph_offset = 0;
208  tcp_header_t *tcp0;
209 
210  bi0 = from[0];
211  b0 = vlib_get_buffer (vm, bi0);
212  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
213  iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
214  ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
215  + iph_offset);
216 
217  /* lookup for SPD only if sw_if_index is changed */
218  if (PREDICT_FALSE (last_sw_if_index != sw_if_index0))
219  {
220  uword *p = hash_get (im->spd_index_by_sw_if_index, sw_if_index0);
221  ASSERT (p);
222  spd_index0 = p[0];
223  spd0 = pool_elt_at_index (im->spds, spd_index0);
224  last_sw_if_index = sw_if_index0;
225  }
226 
227  if (is_ipv6)
228  {
229  ip6_0 = (ip6_header_t *) ((u8 *) vlib_buffer_get_current (b0)
230  + iph_offset);
231 
232  udp0 = ip6_next_header (ip6_0);
233 #if 0
235  ("packet received from %U port %u to %U port %u spd_id %u",
237  clib_net_to_host_u16 (udp0->src_port), format_ip6_address,
238  &ip6_0->dst_address, clib_net_to_host_u16 (udp0->dst_port),
239  spd0->id);
240 #endif
241 
242  p0 = ipsec_output_ip6_policy_match (spd0,
243  &ip6_0->src_address,
244  &ip6_0->dst_address,
245  clib_net_to_host_u16
246  (udp0->src_port),
247  clib_net_to_host_u16
248  (udp0->dst_port),
249  ip6_0->protocol);
250  }
251  else
252  {
253  udp0 = (udp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
254 
255 #if 0
256  clib_warning ("packet received from %U to %U port %u",
259  clib_net_to_host_u16 (udp0->dst_port));
260  clib_warning ("sw_if_index0 %u spd_index0 %u spd_id %u",
261  sw_if_index0, spd_index0, spd0->id);
262 #endif
263 
264  p0 = ipsec_output_policy_match (spd0, ip0->protocol,
265  clib_net_to_host_u32
266  (ip0->src_address.as_u32),
267  clib_net_to_host_u32
268  (ip0->dst_address.as_u32),
269  clib_net_to_host_u16
270  (udp0->src_port),
271  clib_net_to_host_u16
272  (udp0->dst_port));
273  }
274  tcp0 = (void *) udp0;
275 
276  if (PREDICT_TRUE (p0 != NULL))
277  {
278  if (p0->policy == IPSEC_POLICY_ACTION_PROTECT)
279  {
280  ipsec_sa_t *sa = 0;
281  nc_protect++;
282  sa = pool_elt_at_index (im->sad, p0->sa_index);
283  if (sa->protocol == IPSEC_PROTOCOL_ESP)
284  next_node_index = im->esp_encrypt_node_index;
285  else
286  next_node_index = im->ah_encrypt_node_index;
287  vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
288  p0->counter.packets++;
289  if (is_ipv6)
290  {
291  p0->counter.bytes +=
292  clib_net_to_host_u16 (ip6_0->payload_length);
293  p0->counter.bytes += sizeof (ip6_header_t);
294  if (PREDICT_FALSE
295  (b0->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM))
296  {
297  tcp0->checksum =
298  ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0,
299  &bogus);
300  b0->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
301  }
302  if (PREDICT_FALSE
303  (b0->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
304  {
305  udp0->checksum =
306  ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0,
307  &bogus);
308  b0->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
309  }
310  }
311  else
312  {
313  p0->counter.bytes += clib_net_to_host_u16 (ip0->length);
314  if (b0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
315  {
316  ip0->checksum = ip4_header_checksum (ip0);
317  b0->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
318  }
319  if (PREDICT_FALSE
320  (b0->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM))
321  {
322  tcp0->checksum =
323  ip4_tcp_udp_compute_checksum (vm, b0, ip0);
324  b0->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
325  }
326  if (PREDICT_FALSE
327  (b0->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
328  {
329  udp0->checksum =
330  ip4_tcp_udp_compute_checksum (vm, b0, ip0);
331  b0->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
332  }
333  }
334  vlib_buffer_advance (b0, iph_offset);
335  }
336  else if (p0->policy == IPSEC_POLICY_ACTION_BYPASS)
337  {
338  nc_bypass++;
339  next_node_index = get_next_output_feature_node_index (b0, node);
340  p0->counter.packets++;
341  if (is_ipv6)
342  {
343  p0->counter.bytes +=
344  clib_net_to_host_u16 (ip6_0->payload_length);
345  p0->counter.bytes += sizeof (ip6_header_t);
346  }
347  else
348  {
349  p0->counter.bytes += clib_net_to_host_u16 (ip0->length);
350  }
351  }
352  else
353  {
354  nc_discard++;
355  p0->counter.packets++;
356  if (is_ipv6)
357  {
358  p0->counter.bytes +=
359  clib_net_to_host_u16 (ip6_0->payload_length);
360  p0->counter.bytes += sizeof (ip6_header_t);
361  }
362  else
363  {
364  p0->counter.bytes += clib_net_to_host_u16 (ip0->length);
365  }
366  next_node_index = im->error_drop_node_index;
367  }
368  }
369  else
370  {
371  nc_nomatch++;
372  next_node_index = im->error_drop_node_index;
373  }
374 
375  from += 1;
376  n_left_from -= 1;
377 
378  if (PREDICT_FALSE ((last_next_node_index != next_node_index) || f == 0))
379  {
380  /* if this is not 1st frame */
381  if (f)
382  vlib_put_frame_to_node (vm, last_next_node_index, f);
383 
384  last_next_node_index = next_node_index;
385 
386  f = vlib_get_frame_to_node (vm, next_node_index);
387  to_next = vlib_frame_vector_args (f);
388  }
389 
390  to_next[0] = bi0;
391  to_next += 1;
392  f->n_vectors++;
393 
394  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
395  {
396  ipsec_output_trace_t *tr =
397  vlib_add_trace (vm, node, b0, sizeof (*tr));
398  if (spd0)
399  tr->spd_id = spd0->id;
400  }
401  }
402 
403  vlib_put_frame_to_node (vm, next_node_index, f);
405  IPSEC_OUTPUT_ERROR_POLICY_PROTECT, nc_protect);
407  IPSEC_OUTPUT_ERROR_POLICY_BYPASS, nc_bypass);
409  IPSEC_OUTPUT_ERROR_POLICY_DISCARD, nc_discard);
411  IPSEC_OUTPUT_ERROR_POLICY_NO_MATCH,
412  nc_nomatch);
413  return from_frame->n_vectors;
414 }
415 
416 static uword
417 ipsec_output_ip4_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
418  vlib_frame_t * frame)
419 {
420  return ipsec_output_inline (vm, node, frame, 0);
421 }
422 
423 /* *INDENT-OFF* */
424 VLIB_REGISTER_NODE (ipsec_output_ip4_node,static) = {
425  .function = ipsec_output_ip4_node_fn,
426  .name = "ipsec-output-ip4",
427  .vector_size = sizeof (u32),
428  .format_trace = format_ipsec_output_trace,
429  .type = VLIB_NODE_TYPE_INTERNAL,
430 
431  .n_errors = ARRAY_LEN(ipsec_output_error_strings),
432  .error_strings = ipsec_output_error_strings,
433 
434  .n_next_nodes = IPSEC_OUTPUT_N_NEXT,
435  .next_nodes = {
436 #define _(s,n) [IPSEC_OUTPUT_NEXT_##s] = n,
438 #undef _
439  },
440 };
441 /* *INDENT-ON* */
442 
443 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_output_ip4_node, ipsec_output_ip4_node_fn)
444  static uword
445  ipsec_output_ip6_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
446  vlib_frame_t * frame)
447 {
448  return ipsec_output_inline (vm, node, frame, 1);
449 }
450 
451 /* *INDENT-OFF* */
452 VLIB_REGISTER_NODE (ipsec_output_ip6_node,static) = {
453  .function = ipsec_output_ip6_node_fn,
454  .name = "ipsec-output-ip6",
455  .vector_size = sizeof (u32),
456  .format_trace = format_ipsec_output_trace,
457  .type = VLIB_NODE_TYPE_INTERNAL,
458 
459  .n_errors = ARRAY_LEN(ipsec_output_error_strings),
460  .error_strings = ipsec_output_error_strings,
461 
462  .n_next_nodes = IPSEC_OUTPUT_N_NEXT,
463  .next_nodes = {
464 #define _(s,n) [IPSEC_OUTPUT_NEXT_##s] = n,
466 #undef _
467  },
468 };
469 /* *INDENT-ON* */
470 
471 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_output_ip6_node, ipsec_output_ip6_node_fn)
472 #else /* IPSEC > 1 */
473 
474 /* Dummy ipsec output node, in case when IPSec is disabled */
475 
476 static uword
478  vlib_node_runtime_t * node, vlib_frame_t * frame)
479 {
480  clib_warning ("IPSec disabled");
481  return 0;
482 }
483 
484 /* *INDENT-OFF* */
485 VLIB_REGISTER_NODE (ipsec_output_node) = {
486  .vector_size = sizeof (u32),
487  .function = ipsec_output_node_fn,
488  .name = "ipsec-output-ip4",
489 };
490 
491 VLIB_REGISTER_NODE (ipsec_output_node) = {
492  .vector_size = sizeof (u32),
493  .function = ipsec_output_node_fn,
494  .name = "ipsec-output-ip6",
495 };
496 /* *INDENT-ON* */
497 #endif
498 
499 /*
500  * fd.io coding-style-patch-verification: ON
501  *
502  * Local Variables:
503  * eval: (c-set-style "gnu")
504  * End:
505  */
ip46_address_t stop
Definition: ipsec.h:149
ipsec_spd_t * spds
Definition: ipsec.h:263
#define CLIB_UNUSED(x)
Definition: clib.h:79
u16 stop
Definition: ipsec.h:154
ip4_address_t src_address
Definition: ip4_packet.h:169
#define PREDICT_TRUE(x)
Definition: clib.h:106
u64 as_u64[2]
Definition: ip6_packet.h:51
unsigned long u64
Definition: types.h:89
static int ip4_header_bytes(ip4_header_t *i)
Definition: ip4_packet.h:234
#define NULL
Definition: clib.h:55
u32 ah_encrypt_node_index
Definition: ipsec.h:292
int i
static uword ip6_addr_match_range(ip6_address_t *a, ip6_address_t *la, ip6_address_t *ua)
Definition: ipsec_input.c:122
u32 * ipv4_outbound_policies
Definition: ipsec.h:226
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
struct _tcp_header tcp_header_t
ip6_address_t src_address
Definition: ip6_packet.h:347
unsigned char u8
Definition: types.h:56
port_range_t lport
Definition: ipsec.h:208
uword * spd_index_by_sw_if_index
Definition: ipsec.h:283
format_function_t format_ip4_address
Definition: format.h:81
ipsec_main_t ipsec_main
Definition: ipsec.c:30
#define always_inline
Definition: clib.h:92
ip4_address_t dst_address
Definition: ip4_packet.h:169
vlib_frame_t * vlib_get_frame_to_node(vlib_main_t *vm, u32 to_node_index)
Definition: main.c:182
unsigned int u32
Definition: types.h:88
ipsec_policy_t * policies
Definition: ipsec.h:224
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:194
u32 error_drop_node_index
Definition: ipsec.h:289
#define hash_get(h, key)
Definition: hash.h:249
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:464
counter_t packets
packet counter
Definition: counter.h:142
unsigned short u16
Definition: types.h:57
void vlib_put_frame_to_node(vlib_main_t *vm, u32 to_node_index, vlib_frame_t *f)
Definition: main.c:191
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:202
#define PREDICT_FALSE(x)
Definition: clib.h:105
ip46_address_range_t laddr
Definition: ipsec.h:205
u32 node_index
Node index.
Definition: node.h:473
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1168
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:153
u16 n_vectors
Definition: node.h:380
format_function_t format_ip6_address
Definition: format.h:99
u32 esp_encrypt_node_index
Definition: ipsec.h:290
u32 sa_index
Definition: ipsec.h:214
ip46_address_t start
Definition: ipsec.h:149
#define IP_PROTOCOL_SCTP
Definition: sctp.h:343
#define clib_warning(format, args...)
Definition: error.h:59
#define foreach_ipsec_output_next
Definition: ipsec.h:24
#define ARRAY_LEN(x)
Definition: clib.h:59
static_always_inline u32 get_next_output_feature_node_index(vlib_buffer_t *b, vlib_node_runtime_t *nr)
Definition: ipsec.h:377
static void * ip6_next_header(ip6_header_t *i)
Definition: ip6_packet.h:374
port_range_t rport
Definition: ipsec.h:209
ip46_address_range_t raddr
Definition: ipsec.h:206
u16 ip6_tcp_udp_icmp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0, ip6_header_t *ip0, int *bogus_lengthp)
Definition: ip6_forward.c:910
#define ASSERT(truth)
u16 ip4_tcp_udp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0, ip4_header_t *ip0)
Definition: ip4_forward.c:1055
ipsec_sa_t * sad
Definition: ipsec.h:264
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:215
ipsec_protocol_t protocol
Definition: ipsec.h:115
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:55
struct _vlib_node_registration vlib_node_registration_t
counter_t bytes
byte counter
Definition: counter.h:143
Definition: defs.h:47
u16 payload_length
Definition: ip6_packet.h:338
vlib_counter_t counter
Definition: ipsec.h:217
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:267
static uword ipsec_output_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ipsec_output.c:477
u32 * ipv6_outbound_policies
Definition: ipsec.h:227
u32 id
Definition: ipsec.h:222
#define vnet_buffer(b)
Definition: buffer.h:360
#define vec_foreach(var, vec)
Vector iterator.
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:111
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:57
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:246
ip6_address_t dst_address
Definition: ip6_packet.h:347