2 * gre_interface.c: gre interfaces
4 * Copyright (c) 2012 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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include <vnet/vnet.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/gre/gre.h>
21 #include <vnet/ip/format.h>
22 #include <vnet/fib/ip4_fib.h>
23 #include <vnet/fib/ip6_fib.h>
24 #include <vnet/adj/adj_midchain.h>
25 #include <vnet/adj/adj_nbr.h>
26 #include <vnet/mpls/mpls.h>
28 static const char *gre_tunnel_type_names[] = GRE_TUNNEL_TYPE_NAMES;
31 gre4_mk_key (const ip4_address_t *src,
32 const ip4_address_t *dst,
35 // FIXME. the fib index should be part of the key
36 return ((u64)src->as_u32 << 32 | (u64)dst->as_u32);
40 format_gre_tunnel_type (u8 * s, va_list * args)
42 gre_tunnel_type_t type = va_arg (*args, gre_tunnel_type_t);
44 return (format(s, "%s", gre_tunnel_type_names[type]));
48 format_gre_tunnel (u8 * s, va_list * args)
50 gre_tunnel_t * t = va_arg (*args, gre_tunnel_t *);
51 gre_main_t * gm = &gre_main;
52 u8 is_ipv6 = t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6 ? 1 : 0;
56 "[%d] %U (src) %U (dst) payload %U outer_fib_index %d",
58 format_ip4_address, &t->tunnel_src.ip4,
59 format_ip4_address, &t->tunnel_dst.fp_addr.ip4,
60 format_gre_tunnel_type, t->type,
64 "[%d] %U (src) %U (dst) payload %U outer_fib_index %d",
66 format_ip6_address, &t->tunnel_src.ip6,
67 format_ip6_address, &t->tunnel_dst.fp_addr.ip6,
68 format_gre_tunnel_type, t->type,
75 gre_tunnel_db_find (const ip46_address_t *src,
76 const ip46_address_t *dst,
80 gre_main_t * gm = &gre_main;
86 key4 = gre4_mk_key(&src->ip4, &dst->ip4, out_fib_index);
87 p = hash_get (gm->tunnel_by_key4, key4);
91 key6[0] = src->ip6.as_u64[0];
92 key6[1] = src->ip6.as_u64[1];
93 key6[2] = dst->ip6.as_u64[0];
94 key6[3] = dst->ip6.as_u64[1];
95 p = hash_get_mem (gm->tunnel_by_key6, key6);
101 return (pool_elt_at_index (gm->tunnels, p[0]));
105 gre_tunnel_db_add (const gre_tunnel_t *t)
107 gre_main_t * gm = &gre_main;
108 u64 key4, key6[4], *key6_copy;
109 u8 is_ipv6 = t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6 ? 1 : 0;
113 key4 = gre4_mk_key(&t->tunnel_src.ip4, &t->tunnel_dst.fp_addr.ip4,
115 hash_set (gm->tunnel_by_key4, key4, t - gm->tunnels);
119 key6[0] = t->tunnel_src.ip6.as_u64[0];
120 key6[1] = t->tunnel_src.ip6.as_u64[1];
121 key6[2] = t->tunnel_dst.fp_addr.ip6.as_u64[0];
122 key6[3] = t->tunnel_dst.fp_addr.ip6.as_u64[1];
123 key6_copy = clib_mem_alloc (sizeof (key6));
124 clib_memcpy (key6_copy, key6, sizeof (key6));
125 hash_set_mem (gm->tunnel_by_key6, key6_copy, t - gm->tunnels);
130 gre_tunnel_db_remove (const gre_tunnel_t *t)
132 gre_main_t * gm = &gre_main;
134 u8 is_ipv6 = t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6 ? 1 : 0;
138 key4 = gre4_mk_key(&t->tunnel_src.ip4, &t->tunnel_dst.fp_addr.ip4,
140 hash_unset (gm->tunnel_by_key4, key4);
144 key6[0] = t->tunnel_src.ip6.as_u64[0];
145 key6[1] = t->tunnel_src.ip6.as_u64[1];
146 key6[2] = t->tunnel_dst.fp_addr.ip6.as_u64[0];
147 key6[3] = t->tunnel_dst.fp_addr.ip6.as_u64[1];
148 hash_unset_mem (gm->tunnel_by_key6, key6);
153 static gre_tunnel_t *
154 gre_tunnel_from_fib_node (fib_node_t *node)
156 ASSERT(FIB_NODE_TYPE_GRE_TUNNEL == node->fn_type);
157 return ((gre_tunnel_t*) (((char*)node) -
158 STRUCT_OFFSET_OF(gre_tunnel_t, node)));
164 * 'stack' (resolve the recursion for) the tunnel's midchain adjacency
167 gre_tunnel_stack (adj_index_t ai)
169 gre_main_t * gm = &gre_main;
175 sw_if_index = adj->rewrite_header.sw_if_index;
177 if ((vec_len(gm->tunnel_index_by_sw_if_index) < sw_if_index) ||
178 (~0 == gm->tunnel_index_by_sw_if_index[sw_if_index]))
181 gt = pool_elt_at_index(gm->tunnels,
182 gm->tunnel_index_by_sw_if_index[sw_if_index]);
185 * find the adjacency that is contributed by the FIB entry
186 * that this tunnel resovles via, and use it as the next adj
189 if (vnet_hw_interface_get_flags(vnet_get_main(),
191 VNET_HW_INTERFACE_FLAG_LINK_UP)
193 adj_nbr_midchain_stack(
195 fib_entry_contribute_ip_forwarding(gt->fib_entry_index));
199 adj_nbr_midchain_unstack(ai);
204 * @brief Call back when restacking all adjacencies on a GRE interface
207 gre_adj_walk_cb (adj_index_t ai,
210 gre_tunnel_stack(ai);
212 return (ADJ_WALK_RC_CONTINUE);
216 gre_tunnel_restack (gre_tunnel_t *gt)
218 fib_protocol_t proto;
221 * walk all the adjacencies on th GRE interface and restack them
223 FOR_EACH_FIB_IP_PROTOCOL(proto)
225 adj_nbr_walk(gt->sw_if_index,
233 * Function definition to backwalk a FIB node
235 static fib_node_back_walk_rc_t
236 gre_tunnel_back_walk (fib_node_t *node,
237 fib_node_back_walk_ctx_t *ctx)
239 gre_tunnel_restack(gre_tunnel_from_fib_node(node));
241 return (FIB_NODE_BACK_WALK_CONTINUE);
245 * Function definition to get a FIB node from its index
248 gre_tunnel_fib_node_get (fib_node_index_t index)
254 gt = pool_elt_at_index(gm->tunnels, index);
260 * Function definition to inform the FIB node that its last lock has gone.
263 gre_tunnel_last_lock_gone (fib_node_t *node)
266 * The MPLS GRE tunnel is a root of the graph. As such
267 * it never has children and thus is never locked.
273 * Virtual function table registered by MPLS GRE tunnels
274 * for participation in the FIB object graph.
276 const static fib_node_vft_t gre_vft = {
277 .fnv_get = gre_tunnel_fib_node_get,
278 .fnv_last_lock = gre_tunnel_last_lock_gone,
279 .fnv_back_walk = gre_tunnel_back_walk,
283 vnet_gre_tunnel_add (vnet_gre_add_del_tunnel_args_t *a,
286 gre_main_t * gm = &gre_main;
287 vnet_main_t * vnm = gm->vnet_main;
288 ip4_main_t * im4 = &ip4_main;
289 ip6_main_t * im6 = &ip6_main;
291 vnet_hw_interface_t * hi;
292 u32 hw_if_index, sw_if_index;
296 u8 is_ipv6 = a->is_ipv6;
299 outer_fib_index = ip4_fib_index_from_table_id(a->outer_fib_id);
301 outer_fib_index = ip6_fib_index_from_table_id(a->outer_fib_id);
303 if (~0 == outer_fib_index)
304 return VNET_API_ERROR_NO_SUCH_FIB;
306 t = gre_tunnel_db_find(&a->src, &a->dst, a->outer_fib_id, a->is_ipv6);
309 return VNET_API_ERROR_INVALID_VALUE;
311 pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
312 memset (t, 0, sizeof (*t));
313 fib_node_init(&t->node, FIB_NODE_TYPE_GRE_TUNNEL);
316 t->type = GRE_TUNNEL_TYPE_TEB;
318 t->type = GRE_TUNNEL_TYPE_L3;
320 if (vec_len (gm->free_gre_tunnel_hw_if_indices[t->type]) > 0) {
321 vnet_interface_main_t * im = &vnm->interface_main;
323 hw_if_index = gm->free_gre_tunnel_hw_if_indices[t->type]
324 [vec_len (gm->free_gre_tunnel_hw_if_indices[t->type])-1];
325 _vec_len (gm->free_gre_tunnel_hw_if_indices[t->type]) -= 1;
327 hi = vnet_get_hw_interface (vnm, hw_if_index);
328 hi->dev_instance = t - gm->tunnels;
329 hi->hw_instance = hi->dev_instance;
331 /* clear old stats of freed tunnel before reuse */
332 sw_if_index = hi->sw_if_index;
333 vnet_interface_counter_lock(im);
334 vlib_zero_combined_counter
335 (&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_TX], sw_if_index);
336 vlib_zero_combined_counter
337 (&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], sw_if_index);
338 vlib_zero_simple_counter
339 (&im->sw_if_counters[VNET_INTERFACE_COUNTER_DROP], sw_if_index);
340 vnet_interface_counter_unlock(im);
341 if (GRE_TUNNEL_TYPE_TEB == t->type)
343 t->l2_tx_arc = vlib_node_add_named_next(vlib_get_main(),
348 if (GRE_TUNNEL_TYPE_TEB == t->type)
350 /* Default MAC address (d00b:eed0:0000 + sw_if_index) */
351 memset (address, 0, sizeof (address));
356 address[4] = t - gm->tunnels;
358 error = ethernet_register_interface(vnm,
359 gre_device_teb_class.index,
360 t - gm->tunnels, address,
366 clib_error_report (error);
367 return VNET_API_ERROR_INVALID_REGISTRATION;
369 hi = vnet_get_hw_interface (vnm, hw_if_index);
371 t->l2_tx_arc = vlib_node_add_named_next(vlib_get_main(),
375 hw_if_index = vnet_register_interface(vnm,
376 gre_device_class.index,
378 gre_hw_interface_class.index,
381 hi = vnet_get_hw_interface (vnm, hw_if_index);
382 sw_if_index = hi->sw_if_index;
385 t->hw_if_index = hw_if_index;
386 t->outer_fib_index = outer_fib_index;
387 t->sw_if_index = sw_if_index;
388 t->l2_adj_index = ADJ_INDEX_INVALID;
390 vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, sw_if_index, ~0);
391 gm->tunnel_index_by_sw_if_index[sw_if_index] = t - gm->tunnels;
395 vec_validate (im4->fib_index_by_sw_if_index, sw_if_index);
396 hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip4_header_t);
400 vec_validate (im6->fib_index_by_sw_if_index, sw_if_index);
401 hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip6_header_t);
404 hi->per_packet_overhead_bytes =
405 /* preamble */ 8 + /* inter frame gap */ 12;
407 /* Standard default gre MTU. */
408 hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 9000;
411 * source the FIB entry for the tunnel's destination
412 * and become a child thereof. The tunnel will then get poked
413 * when the forwarding for the entry updates, and the tunnel can
414 * re-stack accordingly
417 clib_memcpy (&t->tunnel_src, &a->src, sizeof (t->tunnel_src));
418 t->tunnel_dst.fp_len = !is_ipv6 ? 32 : 128;
419 t->tunnel_dst.fp_proto = !is_ipv6 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
420 t->tunnel_dst.fp_addr = a->dst;
422 gre_tunnel_db_add(t);
425 fib_table_entry_special_add(outer_fib_index,
428 FIB_ENTRY_FLAG_NONE);
430 fib_entry_child_add(t->fib_entry_index,
431 FIB_NODE_TYPE_GRE_TUNNEL,
434 if (GRE_TUNNEL_TYPE_TEB == t->type)
436 t->l2_adj_index = adj_nbr_add_or_lock(t->tunnel_dst.fp_proto,
440 gre_update_adj(vnm, t->sw_if_index, t->l2_adj_index);
444 *sw_if_indexp = sw_if_index;
450 vnet_gre_tunnel_delete (vnet_gre_add_del_tunnel_args_t *a,
453 gre_main_t * gm = &gre_main;
454 vnet_main_t * vnm = gm->vnet_main;
458 t = gre_tunnel_db_find(&a->src, &a->dst, a->outer_fib_id, a->is_ipv6);
461 return VNET_API_ERROR_NO_SUCH_ENTRY;
463 sw_if_index = t->sw_if_index;
464 vnet_sw_interface_set_flags (vnm, sw_if_index, 0 /* down */);
465 /* make sure tunnel is removed from l2 bd or xconnect */
466 set_int_l2_mode(gm->vlib_main, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0);
467 vec_add1 (gm->free_gre_tunnel_hw_if_indices[t->type], t->hw_if_index);
468 gm->tunnel_index_by_sw_if_index[sw_if_index] = ~0;
470 if (GRE_TUNNEL_TYPE_TEB == t->type)
471 adj_unlock(t->l2_adj_index);
473 if (t->l2_adj_index != ADJ_INDEX_INVALID)
474 adj_unlock(t->l2_adj_index);
476 fib_entry_child_remove(t->fib_entry_index,
478 fib_table_entry_delete_index(t->fib_entry_index,
481 gre_tunnel_db_remove(t);
482 fib_node_deinit(&t->node);
483 pool_put (gm->tunnels, t);
486 *sw_if_indexp = sw_if_index;
492 vnet_gre_add_del_tunnel (vnet_gre_add_del_tunnel_args_t *a,
496 return (vnet_gre_tunnel_add(a, sw_if_indexp));
498 return (vnet_gre_tunnel_delete(a, sw_if_indexp));
502 gre_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
504 gre_main_t * gm = &gre_main;
505 vnet_hw_interface_t * hi;
509 hi = vnet_get_hw_interface (vnm, hw_if_index);
511 if (NULL == gm->tunnel_index_by_sw_if_index ||
512 hi->sw_if_index >= vec_len(gm->tunnel_index_by_sw_if_index))
515 ti = gm->tunnel_index_by_sw_if_index[hi->sw_if_index];
518 /* not one of ours */
521 t = pool_elt_at_index(gm->tunnels, ti);
523 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
524 vnet_hw_interface_set_flags (vnm, hw_if_index, VNET_HW_INTERFACE_FLAG_LINK_UP);
526 vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */);
528 gre_tunnel_restack(t);
530 return /* no error */ 0;
533 static clib_error_t *
534 create_gre_tunnel_command_fn (vlib_main_t * vm,
535 unformat_input_t * input,
536 vlib_cli_command_t * cmd)
538 unformat_input_t _line_input, * line_input = &_line_input;
539 vnet_gre_add_del_tunnel_args_t _a, * a = &_a;
540 ip46_address_t src, dst;
541 u32 outer_fib_id = 0;
547 clib_error_t *error = NULL;
551 /* Get a line of input. */
552 if (! unformat_user (input, unformat_line_input, line_input))
555 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) {
556 if (unformat (line_input, "del"))
558 else if (unformat (line_input, "src %U", unformat_ip4_address, &src.ip4)) {
561 } else if (unformat (line_input, "dst %U", unformat_ip4_address, &dst.ip4)) {
564 } else if (unformat (line_input, "src %U", unformat_ip6_address, &src.ip6)) {
567 } else if (unformat (line_input, "dst %U", unformat_ip6_address, &dst.ip6)) {
570 } else if (unformat (line_input, "outer-fib-id %d", &outer_fib_id))
572 else if (unformat (line_input, "teb"))
576 error = clib_error_return (0, "unknown input `%U'",
577 format_unformat_error, line_input);
584 error = clib_error_return (0, "mandatory argument(s) missing");
588 if ((ipv4_set && memcmp (&src.ip4, &dst.ip4, sizeof(src.ip4)) == 0) ||
589 (ipv6_set && memcmp (&src.ip6, &dst.ip6, sizeof(src.ip6)) == 0))
591 error = clib_error_return (0, "src and dst are identical");
595 if (ipv4_set && ipv6_set)
596 return clib_error_return (0, "both IPv4 and IPv6 addresses specified");
598 if ((ipv4_set && memcmp (&dst.ip4, &zero_addr.ip4, sizeof(dst.ip4)) == 0) ||
599 (ipv6_set && memcmp (&dst.ip6, &zero_addr.ip6, sizeof(dst.ip6)) == 0))
601 error = clib_error_return (0, "dst address cannot be zero");
605 memset (a, 0, sizeof (*a));
606 a->outer_fib_id = outer_fib_id;
608 a->is_ipv6 = ipv6_set;
611 clib_memcpy(&a->src.ip4, &src.ip4, sizeof(src.ip4));
612 clib_memcpy(&a->dst.ip4, &dst.ip4, sizeof(dst.ip4));
616 clib_memcpy(&a->src.ip6, &src.ip6, sizeof(src.ip6));
617 clib_memcpy(&a->dst.ip6, &dst.ip6, sizeof(dst.ip6));
621 rv = vnet_gre_tunnel_add(a, &sw_if_index);
623 rv = vnet_gre_tunnel_delete(a, &sw_if_index);
628 vlib_cli_output(vm, "%U\n", format_vnet_sw_if_index_name, vnet_get_main(), sw_if_index);
630 case VNET_API_ERROR_INVALID_VALUE:
631 error = clib_error_return (0, "GRE tunnel already exists...");
633 case VNET_API_ERROR_NO_SUCH_FIB:
634 error = clib_error_return (0, "outer fib ID %d doesn't exist\n",
638 error = clib_error_return (0, "vnet_gre_add_del_tunnel returned %d", rv);
643 unformat_free (line_input);
648 VLIB_CLI_COMMAND (create_gre_tunnel_command, static) = {
649 .path = "create gre tunnel",
650 .short_help = "create gre tunnel src <addr> dst <addr> "
651 "[outer-fib-id <fib>] [teb] [del]",
652 .function = create_gre_tunnel_command_fn,
655 static clib_error_t *
656 show_gre_tunnel_command_fn (vlib_main_t * vm,
657 unformat_input_t * input,
658 vlib_cli_command_t * cmd)
660 gre_main_t * gm = &gre_main;
664 if (pool_elts (gm->tunnels) == 0)
665 vlib_cli_output (vm, "No GRE tunnels configured...");
667 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
669 if (unformat (input, "%d", &ti))
677 pool_foreach (t, gm->tunnels,
679 vlib_cli_output (vm, "%U", format_gre_tunnel, t);
684 t = pool_elt_at_index(gm->tunnels, ti);
686 vlib_cli_output (vm, "%U", format_gre_tunnel, t);
692 VLIB_CLI_COMMAND (show_gre_tunnel_command, static) = {
693 .path = "show gre tunnel",
694 .function = show_gre_tunnel_command_fn,
697 /* force inclusion from application's main.c */
698 clib_error_t *gre_interface_init (vlib_main_t *vm)
700 fib_node_register_type(FIB_NODE_TYPE_GRE_TUNNEL, &gre_vft);
704 VLIB_INIT_FUNCTION(gre_interface_init);