Line data Source code
1 : /*
2 : * Copyright (c) 2015 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 : * node.c: srp packet processing
17 : *
18 : * Copyright (c) 2011 Eliot Dresselhaus
19 : *
20 : * Permission is hereby granted, free of charge, to any person obtaining
21 : * a copy of this software and associated documentation files (the
22 : * "Software"), to deal in the Software without restriction, including
23 : * without limitation the rights to use, copy, modify, merge, publish,
24 : * distribute, sublicense, and/or sell copies of the Software, and to
25 : * permit persons to whom the Software is furnished to do so, subject to
26 : * the following conditions:
27 : *
28 : * The above copyright notice and this permission notice shall be
29 : * included in all copies or substantial portions of the Software.
30 : *
31 : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 : * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 : * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 : * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 : * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 : * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 : * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38 : */
39 :
40 : #include <vlib/vlib.h>
41 : #include <vnet/ip/ip_packet.h> /* for ip_csum_fold */
42 : #include <vnet/srp/srp.h>
43 : #include <vnet/pg/pg.h>
44 :
45 : srp_main_t srp_main;
46 :
47 : typedef struct {
48 : u8 packet_data[32];
49 : } srp_input_trace_t;
50 :
51 0 : static u8 * format_srp_input_trace (u8 * s, va_list * va)
52 : {
53 0 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
54 0 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
55 0 : srp_input_trace_t * t = va_arg (*va, srp_input_trace_t *);
56 :
57 0 : s = format (s, "%U", format_srp_header, t->packet_data);
58 :
59 0 : return s;
60 : }
61 :
62 : typedef enum {
63 : SRP_INPUT_NEXT_ERROR,
64 : SRP_INPUT_NEXT_ETHERNET_INPUT,
65 : SRP_INPUT_NEXT_CONTROL,
66 : SRP_INPUT_N_NEXT,
67 : } srp_input_next_t;
68 :
69 : typedef struct {
70 : u8 next_index;
71 : u8 buffer_advance;
72 : u16 error;
73 : } srp_input_disposition_t;
74 :
75 : static srp_input_disposition_t srp_input_disposition_by_mode[8] = {
76 : [SRP_MODE_reserved0] = {
77 : .next_index = SRP_INPUT_NEXT_ERROR,
78 : .error = SRP_ERROR_UNKNOWN_MODE,
79 : },
80 : [SRP_MODE_reserved1] = {
81 : .next_index = SRP_INPUT_NEXT_ERROR,
82 : .error = SRP_ERROR_UNKNOWN_MODE,
83 : },
84 : [SRP_MODE_reserved2] = {
85 : .next_index = SRP_INPUT_NEXT_ERROR,
86 : .error = SRP_ERROR_UNKNOWN_MODE,
87 : },
88 : [SRP_MODE_reserved3] = {
89 : .next_index = SRP_INPUT_NEXT_ERROR,
90 : .error = SRP_ERROR_UNKNOWN_MODE,
91 : },
92 : [SRP_MODE_keep_alive] = {
93 : .next_index = SRP_INPUT_NEXT_ERROR,
94 : .error = SRP_ERROR_KEEP_ALIVE_DROPPED,
95 : },
96 : [SRP_MODE_data] = {
97 : .next_index = SRP_INPUT_NEXT_ETHERNET_INPUT,
98 : .buffer_advance = sizeof (srp_header_t),
99 : },
100 : [SRP_MODE_control_pass_to_host] = {
101 : .next_index = SRP_INPUT_NEXT_CONTROL,
102 : },
103 : [SRP_MODE_control_locally_buffered_for_host] = {
104 : .next_index = SRP_INPUT_NEXT_CONTROL,
105 : },
106 : };
107 :
108 : static uword
109 0 : srp_input (vlib_main_t * vm,
110 : vlib_node_runtime_t * node,
111 : vlib_frame_t * from_frame)
112 : {
113 0 : vnet_main_t * vnm = vnet_get_main();
114 0 : srp_main_t * sm = &srp_main;
115 : u32 n_left_from, next_index, * from, * to_next;
116 :
117 0 : from = vlib_frame_vector_args (from_frame);
118 0 : n_left_from = from_frame->n_vectors;
119 :
120 0 : if (node->flags & VLIB_NODE_FLAG_TRACE)
121 0 : vlib_trace_frame_buffers_only (vm, node,
122 : from,
123 : n_left_from,
124 : sizeof (from[0]),
125 : sizeof (srp_input_trace_t));
126 :
127 0 : next_index = node->cached_next_index;
128 :
129 0 : while (n_left_from > 0)
130 : {
131 : u32 n_left_to_next;
132 :
133 0 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
134 :
135 0 : while (n_left_from >= 4 && n_left_to_next >= 2)
136 : {
137 : u32 bi0, bi1, sw_if_index0, sw_if_index1;
138 : vlib_buffer_t * b0, * b1;
139 : u8 next0, next1, error0, error1;
140 : srp_header_t * s0, * s1;
141 : srp_input_disposition_t * d0, * d1;
142 : vnet_hw_interface_t * hi0, * hi1;
143 : srp_interface_t * si0, * si1;
144 :
145 : /* Prefetch next iteration. */
146 : {
147 : vlib_buffer_t * b2, * b3;
148 :
149 0 : b2 = vlib_get_buffer (vm, from[2]);
150 0 : b3 = vlib_get_buffer (vm, from[3]);
151 :
152 0 : vlib_prefetch_buffer_header (b2, LOAD);
153 0 : vlib_prefetch_buffer_header (b3, LOAD);
154 :
155 0 : CLIB_PREFETCH (b2->data, sizeof (srp_header_t), LOAD);
156 0 : CLIB_PREFETCH (b3->data, sizeof (srp_header_t), LOAD);
157 : }
158 :
159 0 : bi0 = from[0];
160 0 : bi1 = from[1];
161 0 : to_next[0] = bi0;
162 0 : to_next[1] = bi1;
163 0 : from += 2;
164 0 : to_next += 2;
165 0 : n_left_to_next -= 2;
166 0 : n_left_from -= 2;
167 :
168 0 : b0 = vlib_get_buffer (vm, bi0);
169 0 : b1 = vlib_get_buffer (vm, bi1);
170 :
171 0 : s0 = vlib_buffer_get_current (b0);
172 0 : s1 = vlib_buffer_get_current (b1);
173 :
174 : /* Data packets are always assigned to side A (outer ring) interface. */
175 0 : sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
176 0 : sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
177 :
178 0 : hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
179 0 : hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1);
180 :
181 0 : si0 = pool_elt_at_index (sm->interface_pool, hi0->hw_instance);
182 0 : si1 = pool_elt_at_index (sm->interface_pool, hi1->hw_instance);
183 :
184 0 : sw_if_index0 = (s0->mode == SRP_MODE_data
185 : ? si0->rings[SRP_RING_OUTER].sw_if_index
186 0 : : sw_if_index0);
187 0 : sw_if_index1 = (s1->mode == SRP_MODE_data
188 : ? si1->rings[SRP_RING_OUTER].sw_if_index
189 0 : : sw_if_index1);
190 :
191 0 : vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
192 0 : vnet_buffer (b1)->sw_if_index[VLIB_RX] = sw_if_index1;
193 :
194 0 : d0 = srp_input_disposition_by_mode + s0->mode;
195 0 : d1 = srp_input_disposition_by_mode + s1->mode;
196 :
197 0 : next0 = d0->next_index;
198 0 : next1 = d1->next_index;
199 :
200 0 : error0 = d0->error;
201 0 : error1 = d1->error;
202 :
203 0 : vlib_buffer_advance (b0, d0->buffer_advance);
204 0 : vlib_buffer_advance (b1, d1->buffer_advance);
205 :
206 0 : b0->error = node->errors[error0];
207 0 : b1->error = node->errors[error1];
208 :
209 0 : vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
210 : to_next, n_left_to_next,
211 : bi0, bi1, next0, next1);
212 : }
213 :
214 0 : while (n_left_from > 0 && n_left_to_next > 0)
215 : {
216 : u32 bi0, sw_if_index0;
217 : vlib_buffer_t * b0;
218 : u8 next0, error0;
219 : srp_header_t * s0;
220 : srp_input_disposition_t * d0;
221 : srp_interface_t * si0;
222 : vnet_hw_interface_t * hi0;
223 :
224 0 : bi0 = from[0];
225 0 : to_next[0] = bi0;
226 0 : from += 1;
227 0 : to_next += 1;
228 0 : n_left_to_next -= 1;
229 0 : n_left_from -= 1;
230 :
231 0 : b0 = vlib_get_buffer (vm, bi0);
232 :
233 0 : s0 = vlib_buffer_get_current (b0);
234 :
235 : /* Data packets are always assigned to side A (outer ring) interface. */
236 0 : sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
237 :
238 0 : hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
239 :
240 0 : si0 = pool_elt_at_index (sm->interface_pool, hi0->hw_instance);
241 :
242 0 : sw_if_index0 = (s0->mode == SRP_MODE_data
243 : ? si0->rings[SRP_RING_OUTER].sw_if_index
244 0 : : sw_if_index0);
245 :
246 0 : vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
247 :
248 0 : d0 = srp_input_disposition_by_mode + s0->mode;
249 :
250 0 : next0 = d0->next_index;
251 :
252 0 : error0 = d0->error;
253 :
254 0 : vlib_buffer_advance (b0, d0->buffer_advance);
255 :
256 0 : b0->error = node->errors[error0];
257 :
258 0 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
259 : to_next, n_left_to_next,
260 : bi0, next0);
261 : }
262 :
263 0 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
264 : }
265 :
266 0 : return from_frame->n_vectors;
267 : }
268 :
269 : static char * srp_error_strings[] = {
270 : #define _(f,s) s,
271 : foreach_srp_error
272 : #undef _
273 : };
274 :
275 : static vlib_node_registration_t srp_input_node = {
276 : .function = srp_input,
277 : .name = "srp-input",
278 : /* Takes a vector of packets. */
279 : .vector_size = sizeof (u32),
280 :
281 : .n_errors = SRP_N_ERROR,
282 : .error_strings = srp_error_strings,
283 :
284 : .n_next_nodes = SRP_INPUT_N_NEXT,
285 : .next_nodes = {
286 : [SRP_INPUT_NEXT_ERROR] = "error-drop",
287 : [SRP_INPUT_NEXT_ETHERNET_INPUT] = "ethernet-input",
288 : [SRP_INPUT_NEXT_CONTROL] = "srp-control",
289 : },
290 :
291 : .format_buffer = format_srp_header_with_length,
292 : .format_trace = format_srp_input_trace,
293 : .unformat_buffer = unformat_srp_header,
294 : };
295 :
296 : static uword
297 0 : srp_topology_packet (vlib_main_t * vm, u32 sw_if_index, u8 ** contents)
298 : {
299 0 : vnet_main_t * vnm = vnet_get_main();
300 0 : vnet_hw_interface_t * hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
301 : srp_topology_header_t * t;
302 : srp_topology_mac_binding_t * mb;
303 : u32 nb, nmb;
304 :
305 0 : t = (void *) *contents;
306 :
307 0 : nb = clib_net_to_host_u16 (t->n_bytes_of_data_that_follows);
308 0 : nmb = (nb - sizeof (t->originator_address)) / sizeof (mb[0]);
309 0 : if (vec_len (*contents) < sizeof (t[0]) + nmb * sizeof (mb[0]))
310 0 : return SRP_ERROR_TOPOLOGY_BAD_LENGTH;
311 :
312 : /* Fill in our source MAC address. */
313 0 : clib_memcpy_fast (t->ethernet.src_address, hi->hw_address, vec_len (hi->hw_address));
314 :
315 : /* Make space for our MAC binding. */
316 0 : vec_resize (*contents, sizeof (srp_topology_mac_binding_t));
317 0 : t = (void *) *contents;
318 0 : t->n_bytes_of_data_that_follows = clib_host_to_net_u16 (nb + sizeof (mb[0]));
319 :
320 0 : mb = t->bindings + nmb;
321 :
322 0 : mb->flags =
323 0 : ((t->srp.is_inner_ring ? SRP_TOPOLOGY_MAC_BINDING_FLAG_IS_INNER_RING : 0)
324 0 : | (/* is wrapped FIXME */ 0));
325 0 : clib_memcpy_fast (mb->address, hi->hw_address, vec_len (hi->hw_address));
326 :
327 : t->control.checksum
328 0 : = ~ip_csum_fold (ip_incremental_checksum (0, &t->control,
329 0 : vec_len (*contents) - STRUCT_OFFSET_OF (srp_generic_control_header_t, control)));
330 :
331 : {
332 : vlib_frame_t * f;
333 : vlib_buffer_t * b;
334 : u32 * to_next;
335 0 : u32 bi = ~0;
336 :
337 0 : if (vlib_buffer_add_data (vm, /* buffer to append to */ &bi,
338 0 : *contents, vec_len (*contents)))
339 : {
340 : /* complete or partial buffer allocation failure */
341 0 : if (bi != ~0)
342 0 : vlib_buffer_free (vm, &bi, 1);
343 0 : return SRP_ERROR_CONTROL_PACKETS_PROCESSED;
344 : }
345 0 : b = vlib_get_buffer (vm, bi);
346 0 : vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
347 0 : f = vlib_get_frame_to_node (vm, hi->output_node_index);
348 0 : to_next = vlib_frame_vector_args (f);
349 0 : to_next[0] = bi;
350 0 : f->n_vectors = 1;
351 0 : vlib_put_frame_to_node (vm, hi->output_node_index, f);
352 : }
353 :
354 0 : return SRP_ERROR_CONTROL_PACKETS_PROCESSED;
355 : }
356 :
357 : typedef uword (srp_control_handler_function_t) (vlib_main_t * vm,
358 : u32 sw_if_index,
359 : u8 ** contents);
360 :
361 : static uword
362 0 : srp_control_input (vlib_main_t * vm,
363 : vlib_node_runtime_t * node,
364 : vlib_frame_t * from_frame)
365 : {
366 : u32 n_left_from, next_index, * from, * to_next;
367 : vlib_node_runtime_t * error_node;
368 : static u8 * contents;
369 :
370 0 : error_node = vlib_node_get_runtime (vm, srp_input_node.index);
371 :
372 0 : from = vlib_frame_vector_args (from_frame);
373 0 : n_left_from = from_frame->n_vectors;
374 :
375 0 : if (node->flags & VLIB_NODE_FLAG_TRACE)
376 0 : vlib_trace_frame_buffers_only (vm, node,
377 : from,
378 : n_left_from,
379 : sizeof (from[0]),
380 : sizeof (srp_input_trace_t));
381 :
382 0 : next_index = node->cached_next_index;
383 :
384 0 : while (n_left_from > 0)
385 : {
386 : u32 n_left_to_next;
387 :
388 0 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
389 :
390 0 : while (n_left_from > 0 && n_left_to_next > 0)
391 : {
392 : u32 bi0, l2_len0, l3_len0;
393 : vlib_buffer_t * b0;
394 : u8 next0, error0;
395 : srp_generic_control_header_t * s0;
396 :
397 0 : bi0 = from[0];
398 0 : to_next[0] = bi0;
399 0 : from += 1;
400 0 : to_next += 1;
401 0 : n_left_to_next -= 1;
402 0 : n_left_from -= 1;
403 :
404 0 : b0 = vlib_get_buffer (vm, bi0);
405 :
406 0 : s0 = vlib_buffer_get_current(b0);
407 0 : l2_len0 = vlib_buffer_length_in_chain (vm, b0);
408 0 : l3_len0 = l2_len0 - STRUCT_OFFSET_OF (srp_generic_control_header_t, control);
409 :
410 0 : error0 = SRP_ERROR_CONTROL_PACKETS_PROCESSED;
411 :
412 0 : error0 = s0->control.version != 0 ? SRP_ERROR_CONTROL_VERSION_NON_ZERO : error0;
413 :
414 : {
415 0 : u16 save0 = s0->control.checksum;
416 : u16 computed0;
417 0 : s0->control.checksum = 0;
418 0 : computed0 = ~ip_csum_fold (ip_incremental_checksum (0, &s0->control, l3_len0));
419 0 : error0 = save0 != computed0 ? SRP_ERROR_CONTROL_BAD_CHECKSUM : error0;
420 : }
421 :
422 0 : if (error0 == SRP_ERROR_CONTROL_PACKETS_PROCESSED)
423 : {
424 : static srp_control_handler_function_t * t[SRP_N_CONTROL_PACKET_TYPE] = {
425 : [SRP_CONTROL_PACKET_TYPE_topology] = srp_topology_packet,
426 : };
427 : srp_control_handler_function_t * f;
428 :
429 0 : f = 0;
430 0 : if (s0->control.type < ARRAY_LEN (t))
431 0 : f = t[s0->control.type];
432 :
433 0 : if (f)
434 : {
435 0 : vec_validate (contents, l2_len0 - 1);
436 0 : vlib_buffer_contents (vm, bi0, contents);
437 0 : error0 = f (vm, vnet_buffer (b0)->sw_if_index[VLIB_RX], &contents);
438 : }
439 : else
440 0 : error0 = SRP_ERROR_UNKNOWN_CONTROL;
441 : }
442 :
443 0 : b0->error = error_node->errors[error0];
444 0 : next0 = 0;
445 :
446 0 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
447 : to_next, n_left_to_next,
448 : bi0, next0);
449 : }
450 :
451 0 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
452 : }
453 :
454 0 : return from_frame->n_vectors;
455 : }
456 :
457 : static vlib_node_registration_t srp_control_input_node = {
458 : .function = srp_control_input,
459 : .name = "srp-control",
460 : /* Takes a vector of packets. */
461 : .vector_size = sizeof (u32),
462 :
463 : .n_next_nodes = 1,
464 : .next_nodes = {
465 : [0] = "error-drop",
466 : },
467 :
468 : .format_buffer = format_srp_header_with_length,
469 : .format_trace = format_srp_input_trace,
470 : .unformat_buffer = unformat_srp_header,
471 : };
472 :
473 0 : static u8 * format_srp_ips_request_type (u8 * s, va_list * args)
474 : {
475 0 : u32 x = va_arg (*args, u32);
476 0 : char * t = 0;
477 0 : switch (x)
478 : {
479 : #define _(f,n) case SRP_IPS_REQUEST_##f: t = #f; break;
480 0 : foreach_srp_ips_request_type
481 : #undef _
482 0 : default:
483 0 : return format (s, "unknown 0x%x", x);
484 : }
485 0 : return format (s, "%U", format_c_identifier, t);
486 : }
487 :
488 0 : static u8 * format_srp_ips_status (u8 * s, va_list * args)
489 : {
490 0 : u32 x = va_arg (*args, u32);
491 0 : char * t = 0;
492 0 : switch (x)
493 : {
494 : #define _(f,n) case SRP_IPS_STATUS_##f: t = #f; break;
495 0 : foreach_srp_ips_status
496 : #undef _
497 0 : default:
498 0 : return format (s, "unknown 0x%x", x);
499 : }
500 0 : return format (s, "%U", format_c_identifier, t);
501 : }
502 :
503 0 : static u8 * format_srp_ips_state (u8 * s, va_list * args)
504 : {
505 0 : u32 x = va_arg (*args, u32);
506 0 : char * t = 0;
507 0 : switch (x)
508 : {
509 : #define _(f) case SRP_IPS_STATE_##f: t = #f; break;
510 0 : foreach_srp_ips_state
511 : #undef _
512 0 : default:
513 0 : return format (s, "unknown 0x%x", x);
514 : }
515 0 : return format (s, "%U", format_c_identifier, t);
516 : }
517 :
518 0 : static u8 * format_srp_ring (u8 * s, va_list * args)
519 : {
520 0 : u32 ring = va_arg (*args, u32);
521 0 : return format (s, "%s", ring == SRP_RING_INNER ? "inner" : "outer");
522 : }
523 :
524 0 : static u8 * format_srp_ips_header (u8 * s, va_list * args)
525 : {
526 0 : srp_ips_header_t * h = va_arg (*args, srp_ips_header_t *);
527 :
528 0 : s = format (s, "%U, %U, %U, %s-path",
529 0 : format_srp_ips_request_type, h->request_type,
530 0 : format_ethernet_address, h->originator_address,
531 0 : format_srp_ips_status, h->status,
532 0 : h->is_long_path ? "long" : "short");
533 :
534 0 : return s;
535 : }
536 :
537 0 : static u8 * format_srp_interface (u8 * s, va_list * args)
538 : {
539 0 : srp_interface_t * si = va_arg (*args, srp_interface_t *);
540 : srp_interface_ring_t * ir;
541 :
542 0 : s = format (s, "address %U, IPS state %U",
543 0 : format_ethernet_address, si->my_address,
544 0 : format_srp_ips_state, si->current_ips_state);
545 0 : for (ir = si->rings; ir < si->rings + SRP_N_RING; ir++)
546 0 : if (ir->rx_neighbor_address_valid)
547 0 : s = format (s, ", %U neighbor %U",
548 0 : format_srp_ring, ir->ring,
549 0 : format_ethernet_address, ir->rx_neighbor_address);
550 :
551 0 : return s;
552 : }
553 :
554 0 : u8 * format_srp_device (u8 * s, va_list * args)
555 : {
556 0 : u32 hw_if_index = va_arg (*args, u32);
557 0 : CLIB_UNUSED (int verbose) = va_arg (*args, int);
558 0 : vnet_main_t * vnm = vnet_get_main();
559 0 : srp_main_t * sm = &srp_main;
560 0 : vnet_hw_interface_t * hi = vnet_get_hw_interface (vnm, hw_if_index);
561 0 : srp_interface_t * si = pool_elt_at_index (sm->interface_pool, hi->hw_instance);
562 0 : return format (s, "%U", format_srp_interface, si);
563 : }
564 :
565 : always_inline srp_interface_t *
566 0 : srp_get_interface (u32 sw_if_index, srp_ring_type_t * ring)
567 : {
568 0 : vnet_main_t * vnm = vnet_get_main();
569 0 : srp_main_t * sm = &srp_main;
570 0 : vnet_hw_interface_t * hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
571 : srp_interface_t * si;
572 :
573 0 : ASSERT (hi->hw_class_index == srp_hw_interface_class.index);
574 0 : si = pool_elt_at_index (sm->interface_pool, hi->hw_instance);
575 :
576 0 : ASSERT (si->rings[SRP_RING_INNER].hw_if_index == hi->hw_if_index
577 : || si->rings[SRP_RING_OUTER].hw_if_index == hi->hw_if_index);
578 0 : if (ring)
579 0 : *ring =
580 0 : (hi->hw_if_index == si->rings[SRP_RING_INNER].hw_if_index
581 : ? SRP_RING_INNER
582 0 : : SRP_RING_OUTER);
583 :
584 0 : return si;
585 : }
586 :
587 0 : static void init_ips_packet (srp_interface_t * si,
588 : srp_ring_type_t tx_ring,
589 : srp_ips_header_t * i)
590 : {
591 0 : clib_memset (i, 0, sizeof (i[0]));
592 :
593 0 : i->srp.ttl = 1;
594 0 : i->srp.is_inner_ring = tx_ring;
595 0 : i->srp.priority = 7;
596 0 : i->srp.mode = SRP_MODE_control_locally_buffered_for_host;
597 0 : srp_header_compute_parity (&i->srp);
598 :
599 0 : clib_memcpy_fast (&i->ethernet.src_address, &si->my_address, sizeof (si->my_address));
600 0 : i->ethernet.type = clib_host_to_net_u16 (ETHERNET_TYPE_SRP_CONTROL);
601 :
602 : /* Checksum will be filled in later. */
603 0 : i->control.version = 0;
604 0 : i->control.type = SRP_CONTROL_PACKET_TYPE_ips;
605 0 : i->control.ttl = 255;
606 :
607 0 : clib_memcpy_fast (&i->originator_address, &si->my_address, sizeof (si->my_address));
608 0 : }
609 :
610 0 : static void tx_ips_packet (srp_interface_t * si,
611 : srp_ring_type_t tx_ring,
612 : srp_ips_header_t * i)
613 : {
614 0 : srp_main_t * sm = &srp_main;
615 0 : vnet_main_t * vnm = vnet_get_main();
616 0 : vlib_main_t * vm = sm->vlib_main;
617 0 : vnet_hw_interface_t * hi = vnet_get_hw_interface (vnm, si->rings[tx_ring].hw_if_index);
618 : vlib_frame_t * f;
619 : vlib_buffer_t * b;
620 0 : u32 * to_next, bi = ~0;
621 :
622 0 : if (! vnet_sw_interface_is_admin_up (vnm, hi->sw_if_index))
623 0 : return;
624 0 : if (hi->hw_class_index != srp_hw_interface_class.index)
625 0 : return;
626 :
627 : i->control.checksum
628 0 : = ~ip_csum_fold (ip_incremental_checksum (0, &i->control,
629 : sizeof (i[0]) - STRUCT_OFFSET_OF (srp_ips_header_t, control)));
630 :
631 0 : if (vlib_buffer_add_data (vm, /* buffer to append to */ &bi, i,
632 : sizeof (i[0])))
633 : {
634 : /* complete or partial allocation failure */
635 0 : if (bi != ~0)
636 0 : vlib_buffer_free (vm, &bi, 1);
637 0 : return;
638 : }
639 :
640 : /* FIXME trace. */
641 : if (0)
642 : clib_warning ("%U %U",
643 : format_vnet_sw_if_index_name, vnm, hi->sw_if_index,
644 : format_srp_ips_header, i);
645 :
646 0 : b = vlib_get_buffer (vm, bi);
647 0 : vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = hi->sw_if_index;
648 :
649 0 : f = vlib_get_frame_to_node (vm, hi->output_node_index);
650 0 : to_next = vlib_frame_vector_args (f);
651 0 : to_next[0] = bi;
652 0 : f->n_vectors = 1;
653 0 : vlib_put_frame_to_node (vm, hi->output_node_index, f);
654 : }
655 :
656 0 : static int requests_switch (srp_ips_request_type_t r)
657 : {
658 : static u8 t[16] = {
659 : [SRP_IPS_REQUEST_forced_switch] = 1,
660 : [SRP_IPS_REQUEST_manual_switch] = 1,
661 : [SRP_IPS_REQUEST_signal_fail] = 1,
662 : [SRP_IPS_REQUEST_signal_degrade] = 1,
663 : };
664 0 : return (int) r < ARRAY_LEN (t) ? t[r] : 0;
665 : }
666 :
667 : /* Called when an IPS control packet is received on given interface. */
668 0 : void srp_ips_rx_packet (u32 sw_if_index, srp_ips_header_t * h)
669 : {
670 0 : vnet_main_t * vnm = vnet_get_main();
671 0 : vlib_main_t * vm = srp_main.vlib_main;
672 : srp_ring_type_t rx_ring;
673 0 : srp_interface_t * si = srp_get_interface (sw_if_index, &rx_ring);
674 0 : srp_interface_ring_t * ir = &si->rings[rx_ring];
675 :
676 : /* FIXME trace. */
677 : if (0)
678 : clib_warning ("%U %U %U",
679 : format_time_interval, "h:m:s:u", vlib_time_now (vm),
680 : format_vnet_sw_if_index_name, vnm, sw_if_index,
681 : format_srp_ips_header, h);
682 :
683 : /* Ignore self-generated IPS packets. */
684 0 : if (! memcmp (h->originator_address, si->my_address, sizeof (h->originator_address)))
685 0 : goto done;
686 :
687 : /* Learn neighbor address from short path messages. */
688 0 : if (! h->is_long_path)
689 : {
690 0 : if (ir->rx_neighbor_address_valid
691 0 : && memcmp (ir->rx_neighbor_address, h->originator_address, sizeof (ir->rx_neighbor_address)))
692 : {
693 0 : ASSERT (0);
694 : }
695 0 : ir->rx_neighbor_address_valid = 1;
696 0 : clib_memcpy_fast (ir->rx_neighbor_address, h->originator_address, sizeof (ir->rx_neighbor_address));
697 : }
698 :
699 0 : switch (si->current_ips_state)
700 : {
701 0 : case SRP_IPS_STATE_idle:
702 : /* Received {REQ,NEIGHBOR,W,S} in idle state: wrap. */
703 0 : if (requests_switch (h->request_type)
704 0 : && ! h->is_long_path
705 0 : && h->status == SRP_IPS_STATUS_wrapped)
706 : {
707 : srp_ips_header_t to_tx[2];
708 :
709 0 : si->current_ips_state = SRP_IPS_STATE_wrapped;
710 0 : si->hw_wrap_function (si->rings[SRP_SIDE_A].hw_if_index, /* enable_wrap */ 1);
711 0 : si->hw_wrap_function (si->rings[SRP_SIDE_B].hw_if_index, /* enable_wrap */ 1);
712 :
713 0 : init_ips_packet (si, rx_ring ^ 0, &to_tx[0]);
714 0 : to_tx[0].request_type = SRP_IPS_REQUEST_idle;
715 0 : to_tx[0].status = SRP_IPS_STATUS_wrapped;
716 0 : to_tx[0].is_long_path = 0;
717 0 : tx_ips_packet (si, rx_ring ^ 0, &to_tx[0]);
718 :
719 0 : init_ips_packet (si, rx_ring ^ 1, &to_tx[1]);
720 0 : to_tx[1].request_type = h->request_type;
721 0 : to_tx[1].status = SRP_IPS_STATUS_wrapped;
722 0 : to_tx[1].is_long_path = 1;
723 0 : tx_ips_packet (si, rx_ring ^ 1, &to_tx[1]);
724 : }
725 0 : break;
726 :
727 0 : case SRP_IPS_STATE_wrapped:
728 0 : if (! h->is_long_path
729 0 : && h->request_type == SRP_IPS_REQUEST_idle
730 0 : && h->status == SRP_IPS_STATUS_idle)
731 : {
732 0 : si->current_ips_state = SRP_IPS_STATE_idle;
733 0 : si->hw_wrap_function (si->rings[SRP_SIDE_A].hw_if_index, /* enable_wrap */ 0);
734 0 : si->hw_wrap_function (si->rings[SRP_SIDE_B].hw_if_index, /* enable_wrap */ 0);
735 : }
736 0 : break;
737 :
738 0 : case SRP_IPS_STATE_pass_thru:
739 : /* FIXME */
740 0 : break;
741 :
742 0 : default:
743 0 : abort ();
744 : break;
745 : }
746 0 : done:
747 : ;
748 0 : }
749 :
750 : /* Preform local IPS request on given interface. */
751 0 : void srp_ips_local_request (u32 sw_if_index, srp_ips_request_type_t request)
752 : {
753 0 : vnet_main_t * vnm = vnet_get_main();
754 0 : srp_main_t * sm = &srp_main;
755 : srp_ring_type_t rx_ring;
756 0 : srp_interface_t * si = srp_get_interface (sw_if_index, &rx_ring);
757 0 : srp_interface_ring_t * ir = &si->rings[rx_ring];
758 :
759 0 : if (request == SRP_IPS_REQUEST_wait_to_restore)
760 : {
761 0 : if (si->current_ips_state != SRP_IPS_STATE_wrapped)
762 0 : return;
763 0 : if (! ir->waiting_to_restore)
764 : {
765 0 : ir->wait_to_restore_start_time = vlib_time_now (sm->vlib_main);
766 0 : ir->waiting_to_restore = 1;
767 : }
768 : }
769 : else
770 : {
771 : /* FIXME handle local signal fail. */
772 0 : ir->wait_to_restore_start_time = 0;
773 0 : ir->waiting_to_restore = 0;
774 : }
775 :
776 : /* FIXME trace. */
777 : if (0)
778 : clib_warning ("%U %U",
779 : format_vnet_sw_if_index_name, vnm, sw_if_index,
780 : format_srp_ips_request_type, request);
781 :
782 : }
783 :
784 0 : static void maybe_send_ips_message (srp_interface_t * si)
785 : {
786 0 : srp_main_t * sm = &srp_main;
787 : srp_ips_header_t to_tx[2];
788 0 : srp_ring_type_t rx_ring = SRP_RING_OUTER;
789 0 : srp_interface_ring_t * r0 = &si->rings[rx_ring ^ 0];
790 0 : srp_interface_ring_t * r1 = &si->rings[rx_ring ^ 1];
791 0 : f64 now = vlib_time_now (sm->vlib_main);
792 :
793 0 : if (! si->ips_process_enable)
794 0 : return;
795 :
796 0 : if (si->current_ips_state == SRP_IPS_STATE_wrapped
797 0 : && r0->waiting_to_restore
798 0 : && r1->waiting_to_restore
799 0 : && now >= r0->wait_to_restore_start_time + si->config.wait_to_restore_idle_delay
800 0 : && now >= r1->wait_to_restore_start_time + si->config.wait_to_restore_idle_delay)
801 : {
802 0 : si->current_ips_state = SRP_IPS_STATE_idle;
803 0 : r0->waiting_to_restore = r1->waiting_to_restore = 0;
804 0 : r0->wait_to_restore_start_time = r1->wait_to_restore_start_time = 0;
805 : }
806 :
807 0 : if (si->current_ips_state != SRP_IPS_STATE_idle)
808 0 : return;
809 :
810 0 : init_ips_packet (si, rx_ring ^ 0, &to_tx[0]);
811 0 : init_ips_packet (si, rx_ring ^ 1, &to_tx[1]);
812 :
813 0 : if (si->current_ips_state == SRP_IPS_STATE_idle)
814 : {
815 0 : to_tx[0].request_type = to_tx[1].request_type = SRP_IPS_REQUEST_idle;
816 0 : to_tx[0].status = to_tx[1].status = SRP_IPS_STATUS_idle;
817 0 : to_tx[0].is_long_path = to_tx[1].is_long_path = 0;
818 : }
819 :
820 0 : else if (si->current_ips_state == SRP_IPS_STATE_wrapped)
821 : {
822 0 : to_tx[0].request_type =
823 0 : (si->rings[rx_ring ^ 0].waiting_to_restore
824 : ? SRP_IPS_REQUEST_wait_to_restore
825 0 : : SRP_IPS_REQUEST_signal_fail);
826 0 : to_tx[1].request_type =
827 0 : (si->rings[rx_ring ^ 1].waiting_to_restore
828 : ? SRP_IPS_REQUEST_wait_to_restore
829 0 : : SRP_IPS_REQUEST_signal_fail);
830 0 : to_tx[0].status = to_tx[1].status = SRP_IPS_STATUS_wrapped;
831 0 : to_tx[0].is_long_path = 0;
832 0 : to_tx[1].is_long_path = 1;
833 : }
834 :
835 0 : tx_ips_packet (si, rx_ring ^ 0, &to_tx[0]);
836 0 : tx_ips_packet (si, rx_ring ^ 1, &to_tx[1]);
837 : }
838 :
839 : static uword
840 0 : srp_ips_process (vlib_main_t * vm,
841 : vlib_node_runtime_t * rt,
842 : vlib_frame_t * f)
843 : {
844 0 : srp_main_t * sm = &srp_main;
845 : srp_interface_t * si;
846 :
847 : while (1)
848 : {
849 0 : pool_foreach (si, sm->interface_pool) {
850 0 : maybe_send_ips_message (si);
851 : }
852 0 : vlib_process_suspend (vm, 1.0);
853 : }
854 :
855 : return 0;
856 : }
857 :
858 : vlib_node_registration_t srp_ips_process_node = {
859 : .function = srp_ips_process,
860 : .type = VLIB_NODE_TYPE_PROCESS,
861 : .name = "srp-ips-process",
862 : .state = VLIB_NODE_STATE_DISABLED,
863 : };
864 :
865 : static void
866 0 : srp_setup_node (vlib_main_t *vm, u32 node_index)
867 : {
868 0 : vlib_node_t *n = vlib_get_node (vm, node_index);
869 0 : pg_node_t *pn = pg_get_node (node_index);
870 0 : n->format_buffer = format_srp_header_with_length;
871 0 : n->unformat_buffer = unformat_srp_header;
872 0 : pn->unformat_edit = unformat_pg_srp_header;
873 0 : }
874 :
875 0 : static clib_error_t * srp_init (vlib_main_t * vm)
876 : {
877 0 : srp_main_t * sm = &srp_main;
878 :
879 0 : sm->default_data_ttl = 255;
880 0 : sm->vlib_main = vm;
881 0 : vlib_register_node (vm, &srp_ips_process_node, "%s",
882 : srp_ips_process_node.name);
883 0 : vlib_register_node (vm, &srp_input_node, "%s", srp_input_node.name);
884 0 : vlib_register_node (vm, &srp_control_input_node, "%s",
885 : srp_control_input_node.name);
886 0 : srp_setup_node (vm, srp_input_node.index);
887 :
888 0 : return 0;
889 : }
890 :
891 25759 : VLIB_INIT_FUNCTION (srp_init);
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