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Vector Packet Processing
ipsec_gre.c
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1 /*
2  * Copyright (c) 2016 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /**
16  * @file
17  * @brief L2-GRE over IPSec packet processing.
18  *
19  * Add GRE header to thr packet and send it to the esp-encrypt node.
20 */
21 
22 #include <vnet/vnet.h>
24 
26 
27 /**
28  * @brief IPv4 and GRE header union.
29  *
30 */
31 typedef struct
32 {
33  union
34  {
35  ip4_and_gre_header_t ip4_and_gre;
36  u64 as_u64[3];
37  };
39 
40 /**
41  * @brief Packet trace.
42  *
43 */
44 typedef struct
45 {
46  u32 tunnel_id; /**< Tunnel-id / index in tunnel vector */
47 
48  u32 length; /**< pkt length */
49 
50  ip4_address_t src; /**< tunnel src IPv4 address */
51  ip4_address_t dst; /**< tunnel dst IPv4 address */
52 
53  u32 sa_id; /**< tunnel IPSec SA id */
55 
56 u8 *
57 format_ipsec_gre_tx_trace (u8 * s, va_list * args)
58 {
59  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
60  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
61  ipsec_gre_tx_trace_t *t = va_arg (*args, ipsec_gre_tx_trace_t *);
62 
63  s = format (s, "GRE: tunnel %d len %d src %U dst %U sa-id %d",
64  t->tunnel_id, clib_net_to_host_u16 (t->length),
67  return s;
68 }
69 
70 /**
71  * @brief IPSec-GRE tunnel interface tx function.
72  *
73  * Add GRE header to the packet.
74  *
75  * @param vm vlib_main_t corresponding to the current thread.
76  * @param node vlib_node_runtime_t data for this node.
77  * @param frame vlib_frame_t whose contents should be dispatched.
78  *
79  * @par Graph mechanics: buffer metadata, next index usage
80  *
81  * <em>Uses:</em>
82  * - <code>node->runtime_data</code>
83  * - Match tunnel by <code>rd->dev_instance</code> in IPSec-GRE tunnels
84  * pool.
85  *
86  * <em>Sets:</em>
87  * - <code>vnet_buffer(b)->output_features.ipsec_sad_index</code>
88  * - Set IPSec Security Association for packet encryption.
89  * - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
90  * - Reset output sw_if_index.
91  *
92  * <em>Next Index:</em>
93  * - Dispatches the packet to the esp-encrypt node.
94 */
95 static uword
97  vlib_node_runtime_t * node, vlib_frame_t * frame)
98 {
100  u32 next_index;
101  u32 *from, *to_next, n_left_from, n_left_to_next;
102  vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
104 
105  /* use an ethertype of 0x01 for l2-gre */
106  u16 l2_gre_protocol_ethertype = clib_net_to_host_u16 (0x01);
107 
108  /* Vector of buffer / pkt indices we're supposed to process */
109  from = vlib_frame_vector_args (frame);
110 
111  /* Number of buffers / pkts */
112  n_left_from = frame->n_vectors;
113 
114  /* Speculatively send the first buffer to the last disposition we used */
115  next_index = node->cached_next_index;
116 
117  while (n_left_from > 0)
118  {
119  /* set up to enqueue to our disposition with index = next_index */
120  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
121 
122  /*
123  * As long as we have enough pkts left to process two pkts
124  * and prefetch two pkts...
125  */
126  while (n_left_from >= 4 && n_left_to_next >= 2)
127  {
128  vlib_buffer_t *b0, *b1;
129  ip4_header_t *ip0, *ip1;
130  ip4_and_gre_union_t *h0, *h1;
131  u32 bi0, next0, bi1, next1;
132  __attribute__ ((unused)) u8 error0, error1;
133 
134  /* Prefetch the next iteration */
135  {
136  vlib_buffer_t *p2, *p3;
137 
138  p2 = vlib_get_buffer (vm, from[2]);
139  p3 = vlib_get_buffer (vm, from[3]);
140 
141  vlib_prefetch_buffer_header (p2, LOAD);
142  vlib_prefetch_buffer_header (p3, LOAD);
143 
144  /*
145  * Prefetch packet data. We expect to overwrite
146  * the inbound L2 header with an ip header and a
147  * gre header. Might want to prefetch the last line
148  * of rewrite space as well; need profile data
149  */
152  }
153 
154  /* Pick up the next two buffer indices */
155  bi0 = from[0];
156  bi1 = from[1];
157 
158  /* Speculatively enqueue them where we sent the last buffer */
159  to_next[0] = bi0;
160  to_next[1] = bi1;
161  from += 2;
162  to_next += 2;
163  n_left_to_next -= 2;
164  n_left_from -= 2;
165 
166  b0 = vlib_get_buffer (vm, bi0);
167  b1 = vlib_get_buffer (vm, bi1);
168 
169  vlib_buffer_advance (b0, -sizeof (*h0));
170  vlib_buffer_advance (b1, -sizeof (*h1));
171 
172  h0 = vlib_buffer_get_current (b0);
173  h1 = vlib_buffer_get_current (b1);
174  h0->as_u64[0] = 0;
175  h0->as_u64[1] = 0;
176  h0->as_u64[2] = 0;
177 
178  h1->as_u64[0] = 0;
179  h1->as_u64[1] = 0;
180  h1->as_u64[2] = 0;
181 
182  ip0 = &h0->ip4_and_gre.ip4;
183  h0->ip4_and_gre.gre.protocol = l2_gre_protocol_ethertype;
184  ip0->ip_version_and_header_length = 0x45;
185  ip0->ttl = 254;
186  ip0->protocol = IP_PROTOCOL_GRE;
187 
188  ip1 = &h1->ip4_and_gre.ip4;
189  h1->ip4_and_gre.gre.protocol = l2_gre_protocol_ethertype;
190  ip1->ip_version_and_header_length = 0x45;
191  ip1->ttl = 254;
192  ip1->protocol = IP_PROTOCOL_GRE;
193 
194  ip0->length =
195  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
196  ip1->length =
197  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
198  ip0->src_address.as_u32 = t->tunnel_src.as_u32;
199  ip1->src_address.as_u32 = t->tunnel_src.as_u32;
200  ip0->dst_address.as_u32 = t->tunnel_dst.as_u32;
201  ip1->dst_address.as_u32 = t->tunnel_dst.as_u32;
202  ip0->checksum = ip4_header_checksum (ip0);
203  ip1->checksum = ip4_header_checksum (ip1);
204 
205  vnet_buffer (b0)->sw_if_index[VLIB_RX] =
206  vnet_buffer (b0)->sw_if_index[VLIB_TX];
207  vnet_buffer (b1)->sw_if_index[VLIB_RX] =
208  vnet_buffer (b1)->sw_if_index[VLIB_TX];
209 
210  vnet_buffer (b0)->ipsec.sad_index = t->local_sa;
211  vnet_buffer (b1)->ipsec.sad_index = t->local_sa;
212 
213  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
214  vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
215 
218  error0 = IPSEC_GRE_ERROR_NONE;
219  error1 = IPSEC_GRE_ERROR_NONE;
220 
221  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
222  {
223  ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
224  b0, sizeof (*tr));
225  tr->tunnel_id = t - igm->tunnels;
226  tr->length = ip0->length;
227  tr->src.as_u32 = ip0->src_address.as_u32;
228  tr->dst.as_u32 = ip0->dst_address.as_u32;
229  tr->sa_id = t->local_sa_id;
230  }
231 
232  if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
233  {
234  ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
235  b1, sizeof (*tr));
236  tr->tunnel_id = t - igm->tunnels;
237  tr->length = ip1->length;
238  tr->src.as_u32 = ip1->src_address.as_u32;
239  tr->dst.as_u32 = ip1->dst_address.as_u32;
240  tr->sa_id = t->local_sa_id;
241  }
242 
243  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
244  to_next, n_left_to_next,
245  bi0, bi1, next0, next1);
246  }
247 
248  while (n_left_from > 0 && n_left_to_next > 0)
249  {
250  vlib_buffer_t *b0;
251  ip4_header_t *ip0;
253  u32 bi0, next0;
254  __attribute__ ((unused)) u8 error0;
255 
256  bi0 = to_next[0] = from[0];
257  from += 1;
258  n_left_from -= 1;
259  to_next += 1;
260  n_left_to_next -= 1;
261 
262  b0 = vlib_get_buffer (vm, bi0);
263 
264  vlib_buffer_advance (b0, -sizeof (*h0));
265 
266  h0 = vlib_buffer_get_current (b0);
267  h0->as_u64[0] = 0;
268  h0->as_u64[1] = 0;
269  h0->as_u64[2] = 0;
270 
271  ip0 = &h0->ip4_and_gre.ip4;
272  h0->ip4_and_gre.gre.protocol = l2_gre_protocol_ethertype;
273  ip0->ip_version_and_header_length = 0x45;
274  ip0->ttl = 254;
275  ip0->protocol = IP_PROTOCOL_GRE;
276  ip0->length =
277  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
278  ip0->src_address.as_u32 = t->tunnel_src.as_u32;
279  ip0->dst_address.as_u32 = t->tunnel_dst.as_u32;
280  ip0->checksum = ip4_header_checksum (ip0);
281 
282  vnet_buffer (b0)->sw_if_index[VLIB_RX] =
283  vnet_buffer (b0)->sw_if_index[VLIB_TX];
284  vnet_buffer (b0)->ipsec.sad_index = t->local_sa;
285  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
286 
288  error0 = IPSEC_GRE_ERROR_NONE;
289 
290  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
291  {
292  ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
293  b0, sizeof (*tr));
294  tr->tunnel_id = t - igm->tunnels;
295  tr->length = ip0->length;
296  tr->src.as_u32 = ip0->src_address.as_u32;
297  tr->dst.as_u32 = ip0->dst_address.as_u32;
298  tr->sa_id = t->local_sa_id;
299  }
300 
301  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
302  to_next, n_left_to_next,
303  bi0, next0);
304  }
305 
306  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
307  }
308 
310  IPSEC_GRE_ERROR_PKTS_ENCAP, frame->n_vectors);
311 
312  return frame->n_vectors;
313 }
314 
315 static clib_error_t *
317  u32 flags)
318 {
320  vnet_hw_interface_set_flags (vnm, hw_if_index,
322  else
323  vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */ );
324 
325  return /* no error */ 0;
326 }
327 
328 static u8 *
329 format_ipsec_gre_tunnel_name (u8 * s, va_list * args)
330 {
331  u32 dev_instance = va_arg (*args, u32);
332  return format (s, "ipsec-gre%d", dev_instance);
333 }
334 
335 static u8 *
336 format_ipsec_gre_device (u8 * s, va_list * args)
337 {
338  u32 dev_instance = va_arg (*args, u32);
339  CLIB_UNUSED (int verbose) = va_arg (*args, int);
340 
341  s = format (s, "IPSEC-GRE tunnel: id %d\n", dev_instance);
342  return s;
343 }
344 
345 /* *INDENT-OFF* */
347  .name = "IPSec GRE tunnel device",
348  .format_device_name = format_ipsec_gre_tunnel_name,
349  .format_device = format_ipsec_gre_device,
350  .format_tx_trace = format_ipsec_gre_tx_trace,
351  .tx_function = ipsec_gre_interface_tx,
352  .admin_up_down_function = ipsec_gre_interface_admin_up_down,
353 };
354 
357 
358 
360  .name = "IPSEC-GRE",
361 };
362 /* *INDENT-ON* */
363 
364 static clib_error_t *
366 {
368  clib_error_t *error;
369 
370  clib_memset (igm, 0, sizeof (igm[0]));
371  igm->vlib_main = vm;
372  igm->vnet_main = vnet_get_main ();
373 
374  if ((error = vlib_call_init_function (vm, ip_main_init)))
375  return error;
376 
377  if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
378  return error;
379 
380  igm->tunnel_by_key = hash_create (0, sizeof (uword));
381 
383 }
384 
386 
387 /*
388 * fd.io coding-style-patch-verification: ON
389 *
390 * Local Variables:
391 * eval: (c-set-style "gnu")
392 * End:
393 */
u32 flags
Definition: vhost_user.h:115
#define CLIB_UNUSED(x)
Definition: clib.h:82
u8 * format_ipsec_gre_tx_trace(u8 *s, va_list *args)
Definition: ipsec_gre.c:57
u8 runtime_data[0]
Function dependent node-runtime data.
Definition: node.h:545
ip4_address_t src_address
Definition: ip4_packet.h:170
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
static clib_error_t * ip4_lookup_init(vlib_main_t *vm)
Definition: ip4_forward.c:906
L2-GRE over IPSec packet processing.
#define VNET_HW_INTERFACE_CLASS(x,...)
Definition: interface.h:466
u64 as_u64
Definition: bihash_doc.h:63
unsigned long u64
Definition: types.h:89
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
VLIB_DEVICE_TX_FUNCTION_MULTIARCH(ipsec_gre_device_class, ipsec_gre_interface_tx)
Definition: ipsec_gre.c:355
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
static clib_error_t * ipsec_gre_init(vlib_main_t *vm)
Definition: ipsec_gre.c:365
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:267
static uword ipsec_gre_interface_tx(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
IPSec-GRE tunnel interface tx function.
Definition: ipsec_gre.c:96
unsigned char u8
Definition: types.h:56
static clib_error_t * ipsec_gre_interface_admin_up_down(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Definition: ipsec_gre.c:316
#define IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT
Definition: ipsec_gre.h:89
ipsec_gre_tunnel_t * tunnels
pool of tunnel instances
Definition: ipsec_gre.h:70
format_function_t format_ip4_address
Definition: format.h:75
ip4_and_gre_header_t ip4_and_gre
Definition: gre.c:28
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:163
IPv4 and GRE header union.
Definition: gre.c:24
ip4_address_t dst_address
Definition: ip4_packet.h:170
ipsec_gre_main_t ipsec_gre_main
Definition: ipsec_gre.c:25
Packet trace.
Definition: ipsec_gre.c:44
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:188
vnet_hw_interface_class_t ipsec_gre_hw_interface_class
static u8 * format_ipsec_gre_tunnel_name(u8 *s, va_list *args)
Definition: ipsec_gre.c:329
unsigned int u32
Definition: types.h:88
u64 as_u64[3]
Definition: gre.c:29
#define vlib_call_init_function(vm, x)
Definition: init.h:260
ip4_address_t dst
tunnel dst IPv4 address
Definition: ipsec_gre.c:51
uword * tunnel_by_key
hash mapping src/dst addr pair to tunnel
Definition: ipsec_gre.h:72
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:511
u32 length
pkt length
Definition: ipsec_gre.c:48
static clib_error_t * ipsec_gre_input_init(vlib_main_t *vm)
Definition: node.c:421
unsigned short u16
Definition: types.h:57
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:214
VNET_DEVICE_CLASS(ipsec_gre_device_class)
#define PREDICT_FALSE(x)
Definition: clib.h:111
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:338
ip4_address_t src
tunnel src IPv4 address
Definition: ipsec_gre.c:50
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1150
vlib_node_registration_t ipsec_gre_input_node
(constructor) VLIB_REGISTER_NODE (ipsec_gre_input_node)
Definition: node.c:400
clib_error_t * ip_main_init(vlib_main_t *vm)
Definition: ip_init.c:45
u16 n_vectors
Definition: node.h:420
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:79
vlib_main_t * vm
Definition: buffer.c:301
u32 sa_id
tunnel IPSec SA id
Definition: ipsec_gre.c:53
IPSec-GRE state.
Definition: ipsec_gre.h:68
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:452
#define hash_create(elts, value_bytes)
Definition: hash.h:696
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:537
vnet_device_class_t ipsec_gre_device_class
IPSec-GRE tunnel parameters.
Definition: ipsec_gre.h:50
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:233
vnet_main_t * vnet_main
convenience
Definition: ipsec_gre.h:80
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:57
Definition: defs.h:47
clib_error_t * vnet_hw_interface_set_flags(vnet_main_t *vnm, u32 hw_if_index, vnet_hw_interface_flags_t flags)
Definition: interface.c:504
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:244
#define vnet_buffer(b)
Definition: buffer.h:368
u8 data[0]
Packet data.
Definition: buffer.h:176
u32 tunnel_id
Tunnel-id / index in tunnel vector.
Definition: ipsec_gre.c:46
u8 ip_version_and_header_length
Definition: ip4_packet.h:138
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:59
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:117
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:62
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:247
vlib_main_t * vlib_main
convenience
Definition: ipsec_gre.h:79
Definition: defs.h:46
static u8 * format_ipsec_gre_device(u8 *s, va_list *args)
Definition: ipsec_gre.c:336