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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 * ip/ip6.h: ip6 main include file
18 * Copyright (c) 2008 Eliot Dresselhaus
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:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
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.
40 #ifndef included_ip_ip6_h
41 #define included_ip_ip6_h
43 #include <vlib/buffer.h>
44 #include <vnet/ethernet/packet.h>
45 #include <vnet/ethernet/mac_address.h>
46 #include <vnet/ip/ip6_packet.h>
47 #include <vnet/ip/ip46_address.h>
48 #include <vnet/ip/ip6_hop_by_hop_packet.h>
49 #include <vnet/ip/lookup.h>
50 #include <vnet/ip/ip_interface.h>
52 #include <vnet/util/radix.h>
53 #include <vnet/util/throttle.h>
58 u32 dst_address_length;
64 /* required for pool_get_aligned. */
65 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
67 /* Table ID (hash key) for this FIB. */
70 /* Index into FIB vector. */
74 typedef struct ip6_mfib_t
76 /* required for pool_get_aligned. */
77 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
79 /* Table ID (hash key) for this FIB. */
82 /* Index into FIB vector. */
88 typedef void (ip6_add_del_interface_address_function_t)
89 (struct ip6_main_t * im,
92 ip6_address_t * address,
93 u32 address_length, u32 if_address_index, u32 is_del);
97 ip6_add_del_interface_address_function_t *function;
98 uword function_opaque;
99 } ip6_add_del_interface_address_callback_t;
101 typedef void (ip6_table_bind_function_t)
102 (struct ip6_main_t * im,
103 uword opaque, u32 sw_if_index, u32 new_fib_index, u32 old_fib_index);
107 ip6_table_bind_function_t *function;
108 uword function_opaque;
109 } ip6_table_bind_callback_t;
111 typedef struct ip6_main_t
113 ip_lookup_main_t lookup_main;
116 struct fib_table_t_ *fibs;
118 /* Pool of V6 FIBs. */
121 /** Vector of MFIBs. */
122 struct mfib_table_t_ *mfibs;
124 /* Network byte orders subnet mask for each prefix length */
125 ip6_address_t fib_masks[129];
127 /* Table index indexed by software interface. */
128 u32 *fib_index_by_sw_if_index;
130 /** Table index indexed by software interface. */
131 u32 *mfib_index_by_sw_if_index;
133 /* IP6 enabled count by software interface */
134 u8 *ip_enabled_by_sw_if_index;
136 /* Hash table mapping table id to fib index.
137 ID space is not necessarily dense; index space is dense. */
138 uword *fib_index_by_table_id;
140 /** Hash table mapping table id to multicast fib index.
141 ID space is not necessarily dense; index space is dense. */
142 uword *mfib_index_by_table_id;
144 /* Hash table mapping interface rewrite adjacency index by sw if index. */
145 uword *interface_route_adj_index_by_sw_if_index;
147 /* Functions to call when interface address changes. */
148 ip6_add_del_interface_address_callback_t
149 * add_del_interface_address_callbacks;
151 /** Functions to call when interface to table biding changes. */
152 ip6_table_bind_callback_t *table_bind_callbacks;
154 /* Seed for Jenkins hash used to compute ip6 flow hash. */
159 /* TTL to use for host generated packets. */
165 /* HBH processing enabled? */
169 throttle_t nd_throttle;
172 #define ND_THROTTLE_BITS 512
174 /* Global ip6 main structure. */
175 extern ip6_main_t ip6_main;
177 /* Global ip6 input node. Errors get attached to ip6 input node. */
178 extern vlib_node_registration_t ip6_input_node;
179 extern vlib_node_registration_t ip6_rewrite_node;
180 extern vlib_node_registration_t ip6_rewrite_mcast_node;
181 extern vlib_node_registration_t ip6_rewrite_local_node;
182 extern vlib_node_registration_t ip6_discover_neighbor_node;
183 extern vlib_node_registration_t ip6_glean_node;
184 extern vlib_node_registration_t ip6_midchain_node;
185 extern vlib_node_registration_t ip6_punt_node;
187 extern void ip6_forward_next_trace (vlib_main_t * vm,
188 vlib_node_runtime_t * node,
189 vlib_frame_t * frame,
190 vlib_rx_or_tx_t which_adj_index);
193 ip6_destination_matches_route (const ip6_main_t * im,
194 const ip6_address_t * key,
195 const ip6_address_t * dest, uword dest_length)
198 for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
200 if ((key->as_uword[i] ^ dest->as_uword[i]) & im->
201 fib_masks[dest_length].as_uword[i])
208 ip6_destination_matches_interface (ip6_main_t * im,
210 ip_interface_address_t * ia)
212 ip6_address_t *a = ip_interface_address_get_address (&im->lookup_main, ia);
213 return ip6_destination_matches_route (im, key, a, ia->address_length);
216 /* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
218 ip6_unaligned_destination_matches_route (ip6_main_t * im,
220 ip6_address_t * dest,
224 for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
226 if ((clib_mem_unaligned (&key->as_uword[i], uword) ^ dest->as_uword[i])
227 & im->fib_masks[dest_length].as_uword[i])
233 /* Find interface address which matches destination. */
234 always_inline ip6_address_t *
235 ip6_interface_address_matching_destination (ip6_main_t * im,
236 const ip6_address_t * dst,
238 ip_interface_address_t **
241 ip_lookup_main_t *lm = &im->lookup_main;
242 ip_interface_address_t *ia;
243 ip6_address_t *result = 0;
246 foreach_ip_interface_address (lm, ia, sw_if_index,
247 1 /* honor unnumbered */,
249 ip6_address_t * a = ip_interface_address_get_address (lm, ia);
250 if (ip6_destination_matches_route (im, dst, a, ia->address_length))
258 *result_ia = result ? ia : 0;
262 clib_error_t *ip6_add_del_interface_address (vlib_main_t * vm,
264 ip6_address_t * address,
265 u32 address_length, u32 is_del);
266 void ip6_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable);
269 * @brief get first IPv6 interface address
271 ip6_address_t *ip6_interface_first_address (ip6_main_t * im, u32 sw_if_index);
273 int ip6_address_compare (ip6_address_t * a1, ip6_address_t * a2);
276 ip6_udp_register_listener (vlib_main_t * vm,
277 u16 dst_port, u32 next_node_index);
279 u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
283 void ip6_register_protocol (u32 protocol, u32 node_index);
284 void ip6_unregister_protocol (u32 protocol);
285 void ip6_local_hop_by_hop_register_protocol (u32 protocol, u32 node_index);
287 serialize_function_t serialize_vnet_ip6_main, unserialize_vnet_ip6_main;
289 int vnet_set_ip6_flow_hash (u32 table_id,
290 flow_hash_config_t flow_hash_config);
292 u8 *format_ip6_forward_next_trace (u8 * s, va_list * args);
294 u32 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0);
296 void ip6_punt_policer_add_del (u8 is_add, u32 policer_index);
297 void ip6_punt_redirect_add (u32 rx_sw_if_index,
298 u32 tx_sw_if_index, ip46_address_t * nh);
299 void ip6_punt_redirect_add_paths (u32 rx_sw_if_index,
300 fib_route_path_t * paths);
301 void ip6_punt_redirect_del (u32 rx_sw_if_index);
303 int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
305 extern vlib_node_registration_t ip6_lookup_node;
307 /* Compute flow hash. We'll use it to select which Sponge to use for this
308 flow. And other things. */
310 ip6_compute_flow_hash (const ip6_header_t * ip,
311 flow_hash_config_t flow_hash_config)
316 uword is_tcp_udp = 0;
317 u8 protocol = ip->protocol;
320 ((ip->protocol == IP_PROTOCOL_TCP)
321 || (ip->protocol == IP_PROTOCOL_UDP)))
324 tcp = (void *) (ip + 1);
326 else if (ip->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)
328 ip6_hop_by_hop_header_t *hbh = (ip6_hop_by_hop_header_t *) (ip + 1);
329 if ((hbh->protocol == IP_PROTOCOL_TCP) ||
330 (hbh->protocol == IP_PROTOCOL_UDP))
333 tcp = (tcp_header_t *) ((u8 *) hbh + ((hbh->length + 1) << 3));
335 protocol = hbh->protocol;
338 t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]);
339 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0;
341 t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]);
342 t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 0;
344 a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
345 b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
347 t1 = is_tcp_udp ? tcp->src : 0;
348 t2 = is_tcp_udp ? tcp->dst : 0;
350 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
351 t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
353 if (flow_hash_config & IP_FLOW_HASH_SYMMETRIC)
369 b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? protocol : 0;
370 c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
371 ((t1 << 16) | t2) : ((t2 << 16) | t1);
373 hash_mix64 (a, b, c);
379 * This function is to search for the header specified by the protocol number
381 * This is used to locate a specific IPv6 extension header
382 * or to find transport layer header.
383 * 1. If the find_hdr_type < 0 then it finds and returns the protocol number and
384 * offset stored in *offset of the transport or ESP header in the chain if
386 * 2. If a header with find_hdr_type > 0 protocol number is found then the
387 * offset is stored in *offset and protocol number of the header is
389 * 3. If find_hdr_type is not found or packet is malformed or
390 * it is a non-first fragment -1 is returned.
393 ip6_locate_header (vlib_buffer_t * p0,
394 ip6_header_t * ip0, int find_hdr_type, u32 * offset)
396 u8 next_proto = ip0->protocol;
403 next_header = ip6_next_header (ip0);
404 cur_offset = sizeof (ip6_header_t);
407 done = (next_proto == find_hdr_type);
410 (u8 *) vlib_buffer_get_current (p0) + p0->current_length))
412 //A malicious packet could set an extension header with a too big size
417 if ((!ip6_ext_hdr (next_proto)) || next_proto == IP_PROTOCOL_IP6_NONXT)
419 if (find_hdr_type < 0)
423 if (next_proto == IP_PROTOCOL_IPV6_FRAGMENTATION)
425 ip6_frag_hdr_t *frag_hdr = (ip6_frag_hdr_t *) next_header;
426 u16 frag_off = ip6_frag_hdr_offset (frag_hdr);
427 /* Non first fragment return -1 */
430 exthdr_len = sizeof (ip6_frag_hdr_t);
431 temp_nxthdr = next_header + exthdr_len;
433 else if (next_proto == IP_PROTOCOL_IPSEC_AH)
436 ip6_ext_authhdr_len (((ip6_ext_header_t *) next_header));
437 temp_nxthdr = next_header + exthdr_len;
442 ip6_ext_header_len (((ip6_ext_header_t *) next_header));
443 temp_nxthdr = next_header + exthdr_len;
445 next_proto = ((ip6_ext_header_t *) next_header)->next_hdr;
446 next_header = temp_nxthdr;
447 cur_offset += exthdr_len;
450 *offset = cur_offset;
454 u8 *format_ip6_hop_by_hop_ext_hdr (u8 * s, va_list * args);
456 * Hop-by-Hop handling
460 /* Array of function pointers to HBH option handling routines */
461 int (*options[256]) (vlib_buffer_t * b, ip6_header_t * ip,
462 ip6_hop_by_hop_option_t * opt);
463 u8 *(*trace[256]) (u8 * s, ip6_hop_by_hop_option_t * opt);
465 } ip6_hop_by_hop_main_t;
467 extern ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
469 int ip6_hbh_register_option (u8 option,
470 int options (vlib_buffer_t * b,
472 ip6_hop_by_hop_option_t * opt),
474 ip6_hop_by_hop_option_t * opt));
475 int ip6_hbh_unregister_option (u8 option);
476 void ip6_hbh_set_next_override (uword next);
479 * Push IPv6 header to buffer
481 * @param vm - vlib_main
482 * @param b - buffer to write the header to
483 * @param src - source IP
484 * @param dst - destination IP
485 * @param prot - payload proto
486 * @param flow_label - flow label
488 * @return - pointer to start of IP header
491 vlib_buffer_push_ip6_custom (vlib_main_t * vm, vlib_buffer_t * b,
492 ip6_address_t * src, ip6_address_t * dst,
493 int proto, u32 flow_label)
499 ip6h = vlib_buffer_push_uninit (b, sizeof (ip6_header_t));
500 ASSERT (flow_label < 1 << 20);
501 ip6h->ip_version_traffic_class_and_flow_label =
502 clib_host_to_net_u32 ((0x6 << 28) | flow_label);
504 /* calculate ip6 payload length */
505 payload_length = vlib_buffer_length_in_chain (vm, b);
506 payload_length -= sizeof (*ip6h);
508 ip6h->payload_length = clib_host_to_net_u16 (payload_length);
510 ip6h->hop_limit = 0xff;
511 ip6h->protocol = proto;
512 clib_memcpy_fast (ip6h->src_address.as_u8, src->as_u8,
513 sizeof (ip6h->src_address));
514 clib_memcpy_fast (ip6h->dst_address.as_u8, dst->as_u8,
515 sizeof (ip6h->src_address));
516 vnet_buffer (b)->l3_hdr_offset = (u8 *) ip6h - b->data;
517 b->flags |= VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
523 * Push IPv6 header to buffer
525 * @param vm - vlib_main
526 * @param b - buffer to write the header to
527 * @param src - source IP
528 * @param dst - destination IP
529 * @param prot - payload proto
531 * @return - pointer to start of IP header
534 vlib_buffer_push_ip6 (vlib_main_t * vm, vlib_buffer_t * b,
535 ip6_address_t * src, ip6_address_t * dst, int proto)
537 return vlib_buffer_push_ip6_custom (vm, b, src, dst, proto,
538 0 /* flow label */ );
543 vlib_buffer_get_ip6_fib_index (vlib_buffer_t * b)
545 u32 fib_index, sw_if_index;
546 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
547 fib_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
548 return (fib_index == (u32) ~ 0) ?
549 vec_elt (ip6_main.fib_index_by_sw_if_index, sw_if_index) : fib_index;
551 #endif /* included_ip_ip6_h */
554 * fd.io coding-style-patch-verification: ON
557 * eval: (c-set-style "gnu")