2 * sixrd.c - 6RD specific functions (RFC5969)
4 * Copyright (c) 2018 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.
19 * This code supports the following sixrd modes:
21 * 32 EA bits (Complete IPv4 address is embedded):
23 * IPv4 suffix is embedded:
25 * No embedded address bits (1:1 mode):
30 #include <vlibapi/api.h>
31 #include <vlibmemory/api.h>
32 #include <vnet/adj/adj.h>
33 #include <vnet/adj/adj_delegate.h>
34 #include <vnet/adj/adj_midchain.h>
35 #include <vnet/dpo/lookup_dpo.h>
36 #include <vnet/fib/fib_table.h>
37 #include <vnet/fib/ip6_fib.h>
38 #include <vnet/plugin/plugin.h>
39 #include <vpp/app/version.h> // Really needed?
41 extern vlib_node_registration_t ip4_sixrd_node;
46 typedef struct sixrd_adj_delegate_t_
49 fib_node_t sixrd_node;
50 fib_node_index_t sixrd_fib_entry_index;
52 } sixrd_adj_delegate_t;
55 * Pool of delegate structs
57 static sixrd_adj_delegate_t *sixrd_adj_delegate_pool;
60 * Adj delegate registered type
62 static adj_delegate_type_t sixrd_adj_delegate_type;
65 * FIB node registered type
67 static fib_node_type_t sixrd_fib_node_type;
69 static inline sixrd_adj_delegate_t *
70 sixrd_adj_from_base (adj_delegate_t * ad)
74 return (pool_elt_at_index (sixrd_adj_delegate_pool, ad->ad_index));
77 static inline const sixrd_adj_delegate_t *
78 sixrd_adj_from_const_base (const adj_delegate_t * ad)
84 return (pool_elt_at_index (sixrd_adj_delegate_pool, ad->ad_index));
88 sixrd_fixup (vlib_main_t * vm, ip_adjacency_t * adj, vlib_buffer_t * b0,
91 ip4_header_t *ip4 = vlib_buffer_get_current (b0);
92 ip6_header_t *ip6 = vlib_buffer_get_current (b0) + sizeof (ip4_header_t);
93 const ipip_tunnel_t *t = data;
95 ip4->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
96 ip4->dst_address.as_u32 =
97 sixrd_get_addr_net (t, ip6->dst_address.as_u64[0]);
98 ip4->checksum = ip4_header_checksum (ip4);
102 ip6ip_fixup (vlib_main_t * vm, ip_adjacency_t * adj, vlib_buffer_t * b0,
105 const ipip_tunnel_t *t = data;
106 ip4_header_t *ip4 = vlib_buffer_get_current (b0);
107 ip4->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
108 ip4->dst_address.as_u32 =
109 sixrd_get_addr_net (t, adj->sub_type.nbr.next_hop.as_u64[0]);
110 ip4->checksum = ip4_header_checksum (ip4);
114 sixrd_build_rewrite (vnet_main_t * vnm, u32 sw_if_index,
115 vnet_link_t link_type, const void *dst_address)
120 t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
124 vec_validate (rewrite, sizeof (ip4_header_t) - 1);
125 ip4_header_t *ip4 = (ip4_header_t *) rewrite;
126 ip4->ip_version_and_header_length = 0x45;
128 ip4->protocol = IP_PROTOCOL_IPV6;
129 /* fixup ip4 header length and checksum after-the-fact */
130 ip4->src_address.as_u32 = t->tunnel_src.ip4.as_u32;
131 ip4->dst_address.as_u32 = 0;
132 ip4->checksum = ip4_header_checksum (ip4);
138 ip6ip_tunnel_stack (adj_index_t ai, u32 fib_entry_index)
140 ip_adjacency_t *adj = adj_get (ai);
142 u32 sw_if_index = adj->rewrite_header.sw_if_index;
144 t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
149 * find the adjacency that is contributed by the FIB entry
150 * that this tunnel resolves via, and use it as the next adj
153 if (vnet_hw_interface_get_flags (vnet_get_main (), t->hw_if_index) &
154 VNET_HW_INTERFACE_FLAG_LINK_UP)
156 adj_nbr_midchain_stack (ai,
157 fib_entry_contribute_ip_forwarding
162 adj_nbr_midchain_unstack (ai);
167 sixrd_tunnel_stack (adj_index_t ai, u32 fib_index)
169 dpo_id_t dpo = DPO_INVALID;
170 ip_adjacency_t *adj = adj_get (ai);
171 u32 sw_if_index = adj->rewrite_header.sw_if_index;
173 ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
177 lookup_dpo_add_or_lock_w_fib_index (fib_index, DPO_PROTO_IP4,
178 LOOKUP_UNICAST, LOOKUP_INPUT_DST_ADDR,
179 LOOKUP_TABLE_FROM_CONFIG, &dpo);
180 adj_nbr_midchain_stack (ai, &dpo);
183 const static ip46_address_t sixrd_special_nh = {
186 [0] = 0xffffffffffffffff,
187 [1] = 0xffffffffffffffff,
193 sixrd_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
195 ip_adjacency_t *adj = adj_get (ai);
196 ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
201 if (!memcmp (&sixrd_special_nh, &adj->sub_type.nbr.next_hop,
202 sizeof (sixrd_special_nh)))
204 adj_nbr_midchain_update_rewrite (ai, sixrd_fixup, t, ADJ_FLAG_NONE,
205 sixrd_build_rewrite (vnm, sw_if_index,
208 sixrd_tunnel_stack (ai, t->fib_index);
212 sixrd_adj_delegate_t *sixrd_ad;
216 sixrd_get_addr_net (t, adj->sub_type.nbr.next_hop.as_u64[0]);
219 .fp_proto = FIB_PROTOCOL_IP4,
227 adj_nbr_midchain_update_rewrite (ai, ip6ip_fixup, t, ADJ_FLAG_NONE,
228 sixrd_build_rewrite (vnm, sw_if_index,
233 sixrd_adj_from_base (adj_delegate_get (adj, sixrd_adj_delegate_type));
234 if (sixrd_ad == NULL)
236 pool_get (sixrd_adj_delegate_pool, sixrd_ad);
237 fib_node_init (&sixrd_ad->sixrd_node, sixrd_fib_node_type);
238 sixrd_ad->adj_index = ai;
239 sixrd_ad->sixrd_fib_entry_index =
240 fib_table_entry_special_add (t->fib_index, &pfx, FIB_SOURCE_RR,
241 FIB_ENTRY_FLAG_NONE);
242 sixrd_ad->sixrd_sibling =
243 fib_entry_child_add (sixrd_ad->sixrd_fib_entry_index,
245 sixrd_ad - sixrd_adj_delegate_pool);
247 adj_delegate_add (adj, sixrd_adj_delegate_type,
248 sixrd_ad - sixrd_adj_delegate_pool);
250 ip6ip_tunnel_stack (ai, sixrd_ad->sixrd_fib_entry_index);
256 sixrd_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
259 vnet_hw_interface_set_flags (vnm, hw_if_index,
260 VNET_HW_INTERFACE_FLAG_LINK_UP);
261 return /* no error */ 0;
265 VNET_HW_INTERFACE_CLASS(sixrd_hw_interface_class) = {
267 .build_rewrite = sixrd_build_rewrite,
268 .update_adjacency = sixrd_update_adj,
271 VNET_DEVICE_CLASS(sixrd_device_class) = {
273 .admin_up_down_function = sixrd_interface_admin_up_down,
282 sixrd_add_tunnel (ip6_address_t * ip6_prefix, u8 ip6_prefix_len,
283 ip4_address_t * ip4_prefix, u8 ip4_prefix_len,
284 ip4_address_t * ip4_src, bool security_check,
285 u32 fib_index, u32 * sw_if_index)
287 ipip_main_t *gm = &ipip_main;
291 return VNET_API_ERROR_NO_SUCH_FIB;
293 if ((ip6_prefix_len + 32 - ip4_prefix_len) > 64)
294 return VNET_API_ERROR_INVALID_VALUE;
296 /* Tunnel already configured */
297 ip46_address_t src = ip46_address_initializer, dst =
298 ip46_address_initializer;
299 ip_set (&src, ip4_src, true);
300 ipip_tunnel_key_t key = {.transport = IPIP_TRANSPORT_IP4,
301 .fib_index = fib_index,
306 t = ipip_tunnel_db_find (&key);
308 return VNET_API_ERROR_IF_ALREADY_EXISTS;
310 /* Get tunnel index */
311 pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
312 memset (t, 0, sizeof (*t));
313 u32 t_idx = t - gm->tunnels; /* tunnel index (or instance) */
315 /* Init tunnel struct */
316 t->mode = IPIP_MODE_6RD;
317 t->sixrd.ip4_prefix.as_u32 = ip4_prefix->as_u32;
318 t->sixrd.ip4_prefix_len = ip4_prefix_len;
319 t->sixrd.ip6_prefix = *ip6_prefix;
320 t->sixrd.ip6_prefix_len = ip6_prefix_len;
322 t->sixrd.security_check = security_check;
324 (ip4_prefix_len < 32) ? 64 - ip6_prefix_len - (32 - ip4_prefix_len) : 0;
326 /* Create interface */
328 vnet_register_interface (vnet_get_main (), sixrd_device_class.index,
330 sixrd_hw_interface_class.index, t_idx);
332 /* Default the interface to up and enable IPv6 (payload) */
333 vnet_hw_interface_t *hi =
334 vnet_get_hw_interface (vnet_get_main (), hw_if_index);
335 t->hw_if_index = hw_if_index;
336 t->fib_index = fib_index;
337 t->sw_if_index = hi->sw_if_index;
338 t->dev_instance = t_idx;
339 t->user_instance = t_idx;
341 hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 1480;
343 ipip_tunnel_db_add (t, &key);
345 vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, hi->sw_if_index,
347 gm->tunnel_index_by_sw_if_index[hi->sw_if_index] = t_idx;
349 vnet_hw_interface_set_flags (vnet_get_main (), hw_if_index,
350 VNET_HW_INTERFACE_FLAG_LINK_UP);
351 vnet_sw_interface_set_flags (vnet_get_main (), hi->sw_if_index,
352 VNET_SW_INTERFACE_FLAG_ADMIN_UP);
353 ip6_sw_interface_enable_disable (hi->sw_if_index, true);
355 /* Create IPv6 route/adjacency */
356 fib_prefix_t pfx6 = {
357 .fp_proto = FIB_PROTOCOL_IP6,
358 .fp_len = t->sixrd.ip6_prefix_len,
360 .ip6 = t->sixrd.ip6_prefix,
365 fib_table_entry_update_one_path (fib_index, &pfx6, FIB_SOURCE_CLI,
366 FIB_ENTRY_FLAG_ATTACHED, DPO_PROTO_IP6,
367 &sixrd_special_nh, hi->sw_if_index, ~0, 1,
368 NULL, FIB_ROUTE_PATH_FLAG_NONE);
370 *sw_if_index = hi->sw_if_index;
372 if (!gm->ip4_protocol_registered)
374 vlib_node_t *ipip4_input =
375 vlib_get_node_by_name (gm->vlib_main, (u8 *) "ipip4-input");
376 ASSERT (ipip4_input);
377 ip4_register_protocol (IP_PROTOCOL_IPV6, ipip4_input->index);
386 sixrd_del_tunnel (u32 sw_if_index)
388 ipip_main_t *gm = &ipip_main;
389 ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
393 clib_warning ("SIXRD tunnel delete: tunnel does not exist: %d",
398 fib_prefix_t pfx6 = {
399 .fp_proto = FIB_PROTOCOL_IP6,
400 .fp_len = t->sixrd.ip6_prefix_len,
402 .ip6 = t->sixrd.ip6_prefix,
406 fib_table_entry_special_remove (0, &pfx6, FIB_SOURCE_CLI);
407 vnet_sw_interface_set_flags (vnet_get_main (), t->sw_if_index,
409 ip6_sw_interface_enable_disable (t->sw_if_index, false);
410 gm->tunnel_index_by_sw_if_index[t->sw_if_index] = ~0;
412 vnet_delete_hw_interface (vnet_get_main (), t->hw_if_index);
413 ipip_tunnel_db_remove (t);
414 pool_put (gm->tunnels, t);
420 sixrd_adj_delegate_adj_deleted (adj_delegate_t * aed)
422 sixrd_adj_delegate_t *sixrd_ad;
424 sixrd_ad = sixrd_adj_from_base (aed);
425 fib_entry_child_remove (sixrd_ad->sixrd_fib_entry_index,
426 sixrd_ad->sixrd_sibling);
427 fib_table_entry_delete_index (sixrd_ad->sixrd_fib_entry_index,
429 pool_put (sixrd_adj_delegate_pool, sixrd_ad);
433 sixrd_adj_delegate_format (const adj_delegate_t * aed, u8 * s)
435 const sixrd_adj_delegate_t *sixrd_ad;
437 sixrd_ad = sixrd_adj_from_const_base (aed);
438 s = format (s, "SIXRD:[fib-entry:%d]", sixrd_ad->sixrd_fib_entry_index);
444 sixrd_fib_node_last_lock_gone (fib_node_t * node)
446 /* top of the dependency tree, locks not managed here. */
449 static sixrd_adj_delegate_t *
450 sixrd_adj_delegate_from_fib_node (fib_node_t * node)
452 return ((sixrd_adj_delegate_t *) (((char *) node) -
453 STRUCT_OFFSET_OF (sixrd_adj_delegate_t,
457 static fib_node_back_walk_rc_t
458 sixrd_fib_node_back_walk_notify (fib_node_t * node,
459 fib_node_back_walk_ctx_t * ctx)
461 sixrd_adj_delegate_t *sixrd_ad;
463 sixrd_ad = sixrd_adj_delegate_from_fib_node (node);
464 ip6ip_tunnel_stack (sixrd_ad->adj_index, sixrd_ad->sixrd_fib_entry_index);
466 return (FIB_NODE_BACK_WALK_CONTINUE);
470 * Function definition to get a FIB node from its index
473 sixrd_fib_node_get (fib_node_index_t index)
475 sixrd_adj_delegate_t *sixrd_ad;
477 sixrd_ad = pool_elt_at_index (sixrd_adj_delegate_pool, index);
479 return (&sixrd_ad->sixrd_node);
483 * VFT registered with the adjacency delegate
485 const static adj_delegate_vft_t sixrd_adj_delegate_vft = {
486 .adv_adj_deleted = sixrd_adj_delegate_adj_deleted,
487 .adv_format = sixrd_adj_delegate_format,
491 * VFT registered with the FIB node for the adj delegate
493 const static fib_node_vft_t sixrd_fib_node_vft = {
494 .fnv_get = sixrd_fib_node_get,
495 .fnv_last_lock = sixrd_fib_node_last_lock_gone,
496 .fnv_back_walk = sixrd_fib_node_back_walk_notify,
499 static clib_error_t *
500 sixrd_init (vlib_main_t * vm)
502 clib_error_t *error = 0;
504 /* Make sure the IPIP tunnel subsystem is initialised */
505 vlib_call_init_function (vm, ipip_init);
507 sixrd_adj_delegate_type =
508 adj_delegate_register_new_type (&sixrd_adj_delegate_vft);
509 sixrd_fib_node_type = fib_node_register_new_type (&sixrd_fib_node_vft);
514 VLIB_INIT_FUNCTION (sixrd_init);
517 * fd.io coding-style-patch-verification: ON
520 * eval: (c-set-style "gnu")