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:
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 #include <vppinfra/error.h>
17 #include <vnet/vnet.h>
18 #include <vnet/ip/ip.h>
19 #include <vlib/vlib.h>
21 #define MAP_SKIP_IP6_LOOKUP 1
28 int map_create_domain(ip4_address_t *ip4_prefix, u8 ip4_prefix_len,
29 ip6_address_t *ip6_prefix, u8 ip6_prefix_len,
30 ip6_address_t *ip6_src, u8 ip6_src_len,
31 u8 ea_bits_len, u8 psid_offset, u8 psid_length,
32 u32 *map_domain_index, u16 mtu, u8 flags);
33 int map_delete_domain(u32 map_domain_index);
34 int map_add_del_psid(u32 map_domain_index, u16 psid, ip6_address_t *tep, u8 is_add);
35 u8 *format_map_trace(u8 *s, va_list *args);
36 i32 ip4_get_port(ip4_header_t *ip, map_dir_e dir, u16 buffer_len);
37 i32 ip6_get_port(ip6_header_t *ip6, map_dir_e dir, u16 buffer_len);
38 u16 ip4_map_get_port (ip4_header_t *ip, map_dir_e dir);
40 typedef enum __attribute__ ((__packed__)) {
41 MAP_DOMAIN_PREFIX = 1 << 0,
42 MAP_DOMAIN_TRANSLATION = 1 << 1, // The domain uses MAP-T
46 * IP4 reassembly logic:
47 * One virtually reassembled flow requires a map_ip4_reass_t structure in order
48 * to keep the first-fragment port number and, optionally, cache out of sequence
50 * There are up to MAP_IP4_REASS_MAX_REASSEMBLY such structures.
51 * When in use, those structures are stored in a hash table of MAP_IP4_REASS_BUCKETS buckets.
52 * When a new structure needs to be used, it is allocated from available ones.
53 * If there is no structure available, the oldest in use is selected and used if and
54 * only if it was first allocated more than MAP_IP4_REASS_LIFETIME seconds ago.
55 * In case no structure can be allocated, the fragment is dropped.
58 #define MAP_IP4_REASS_LIFETIME_DEFAULT (100) /* ms */
59 #define MAP_IP4_REASS_HT_RATIO_DEFAULT (1.0)
60 #define MAP_IP4_REASS_POOL_SIZE_DEFAULT 1024 // Number of reassembly structures
61 #define MAP_IP4_REASS_BUFFERS_DEFAULT 2048
63 #define MAP_IP4_REASS_MAX_FRAGMENTS_PER_REASSEMBLY 5 // Number of fragment per reassembly
65 #define MAP_IP6_REASS_LIFETIME_DEFAULT (100) /* ms */
66 #define MAP_IP6_REASS_HT_RATIO_DEFAULT (1.0)
67 #define MAP_IP6_REASS_POOL_SIZE_DEFAULT 1024 // Number of reassembly structures
68 #define MAP_IP6_REASS_BUFFERS_DEFAULT 2048
70 #define MAP_IP6_REASS_MAX_FRAGMENTS_PER_REASSEMBLY 5
72 #define MAP_IP6_REASS_COUNT_BYTES
73 #define MAP_IP4_REASS_COUNT_BYTES
75 //#define IP6_MAP_T_OVERRIDE_TOS 0
78 * This structure _MUST_ be no larger than a single cache line (64 bytes).
79 * If more space is needed make a union of ip6_prefix and *rules, those are mutually exclusive.
82 ip6_address_t ip6_src;
83 ip6_address_t ip6_prefix;
86 ip4_address_t ip4_prefix;
89 map_domain_flags_e flags;
101 /* not used by forwarding */
105 #define MAP_REASS_INDEX_NONE ((u16)0xffff)
108 * Hash key, padded out to 16 bytes for fast compare
111 CLIB_PACKED (struct {
119 } map_ip4_reass_key_t;
122 map_ip4_reass_key_t key;
124 #ifdef MAP_IP4_REASS_COUNT_BYTES
133 u32 fragments[MAP_IP4_REASS_MAX_FRAGMENTS_PER_REASSEMBLY];
137 * MAP domain counters
140 /* Simple counters */
141 MAP_DOMAIN_IPV4_FRAGMENT = 0,
142 /* Combined counters */
143 MAP_DOMAIN_COUNTER_RX = 0,
144 MAP_DOMAIN_COUNTER_TX,
146 } map_domain_counter_t;
152 CLIB_PACKED (struct {
160 } map_ip6_reass_key_t;
163 u32 pi; //Cached packet or ~0
164 u16 next_data_offset; //The data offset of the additional 20 bytes or ~0
165 u8 next_data_len; //Number of bytes ready to be copied (20 if not last fragment)
166 u8 next_data[20]; //The 20 additional bytes
167 } map_ip6_fragment_t;
170 map_ip6_reass_key_t key;
172 #ifdef MAP_IP6_REASS_COUNT_BYTES
176 u16 bucket; //What hash bucket this element is linked in
180 ip4_header_t ip4_header;
181 map_ip6_fragment_t fragments[MAP_IP6_REASS_MAX_FRAGMENTS_PER_REASSEMBLY];
185 /* pool of MAP domains */
186 map_domain_t *domains;
188 /* MAP Domain packet/byte counters indexed by map domain index */
189 vlib_simple_counter_main_t *simple_domain_counters;
190 vlib_combined_counter_main_t *domain_counters;
191 volatile u32 *counter_lock;
193 #ifdef MAP_SKIP_IP6_LOOKUP
195 u32 adj6_index, adj4_index;
196 ip4_address_t preresolve_ip4;
197 ip6_address_t preresolve_ip6;
200 /* Traffic class: zero, copy (~0) or fixed value */
204 bool sec_check; /* Inbound security check */
205 bool sec_check_frag; /* Inbound security check for (subsequent) fragments */
206 bool icmp6_enabled; /* Send destination unreachable for security check failure */
208 /* ICMPv6 -> ICMPv4 relay parameters */
209 ip4_address_t icmp4_src_address;
210 vlib_simple_counter_main_t icmp_relayed;
213 vlib_main_t *vlib_main;
214 vnet_main_t *vnet_main;
217 * IPv4 encap and decap reassembly
220 f32 ip4_reass_conf_ht_ratio; //Size of ht is 2^ceil(log2(ratio*pool_size))
221 u16 ip4_reass_conf_pool_size; //Max number of allocated reass structures
222 u16 ip4_reass_conf_lifetime_ms; //Time a reassembly struct is considered valid in ms
223 u32 ip4_reass_conf_buffers; //Maximum number of buffers used by ip4 reassembly
226 map_ip4_reass_t *ip4_reass_pool;
227 u8 ip4_reass_ht_log2len; //Hash table size is 2^log2len
228 u16 ip4_reass_allocated;
229 u16 *ip4_reass_hash_table;
230 u16 ip4_reass_fifo_last;
231 volatile u32 *ip4_reass_lock;
234 u32 ip4_reass_buffered_counter;
236 bool frag_inner; /* Inner or outer fragmentation */
237 bool frag_ignore_df; /* Fragment (outer) packet even if DF is set */
240 * IPv6 decap reassembly
243 f32 ip6_reass_conf_ht_ratio; //Size of ht is 2^ceil(log2(ratio*pool_size))
244 u16 ip6_reass_conf_pool_size; //Max number of allocated reass structures
245 u16 ip6_reass_conf_lifetime_ms; //Time a reassembly struct is considered valid in ms
246 u32 ip6_reass_conf_buffers; //Maximum number of buffers used by ip6 reassembly
249 map_ip6_reass_t *ip6_reass_pool;
250 u8 ip6_reass_ht_log2len; //Hash table size is 2^log2len
251 u16 ip6_reass_allocated;
252 u16 *ip6_reass_hash_table;
253 u16 ip6_reass_fifo_last;
254 volatile u32 *ip6_reass_lock;
257 u32 ip6_reass_buffered_counter;
262 * MAP Error counters/messages
264 #define foreach_map_error \
265 /* Must be first. */ \
266 _(NONE, "valid MAP packets") \
267 _(BAD_PROTOCOL, "bad protocol") \
268 _(SEC_CHECK, "security check failed") \
269 _(ENCAP_SEC_CHECK, "encap security check failed") \
270 _(DECAP_SEC_CHECK, "decap security check failed") \
271 _(ICMP, "unable to translate ICMP") \
272 _(ICMP_RELAY, "unable to relay ICMP") \
273 _(UNKNOWN, "unknown") \
274 _(NO_BINDING, "no binding") \
275 _(NO_DOMAIN, "no domain") \
276 _(FRAGMENTED, "packet is a fragment") \
277 _(FRAGMENT_MEMORY, "could not cache fragment") \
278 _(FRAGMENT_MALFORMED, "fragment has unexpected format")\
279 _(FRAGMENT_DROPPED, "dropped cached fragment") \
280 _(MALFORMED, "malformed packet") \
281 _(DF_SET, "can't fragment, DF set")
284 #define _(sym,str) MAP_ERROR_##sym,
290 u64 map_error_counter_get(u32 node_index, map_error_t map_error);
293 u32 map_domain_index;
299 extern vlib_node_registration_t ip4_map_node;
300 extern vlib_node_registration_t ip6_map_node;
302 extern vlib_node_registration_t ip4_map_t_node;
303 extern vlib_node_registration_t ip4_map_t_fragmented_node;
304 extern vlib_node_registration_t ip4_map_t_tcp_udp_node;
305 extern vlib_node_registration_t ip4_map_t_icmp_node;
307 extern vlib_node_registration_t ip6_map_t_node;
308 extern vlib_node_registration_t ip6_map_t_fragmented_node;
309 extern vlib_node_registration_t ip6_map_t_tcp_udp_node;
310 extern vlib_node_registration_t ip6_map_t_icmp_node;
315 static_always_inline u64
316 map_get_pfx (map_domain_t *d, u32 addr, u16 port)
318 u16 psid = (port >> d->psid_shift) & d->psid_mask;
320 if (d->ea_bits_len == 0 && d->rules)
321 return clib_net_to_host_u64(d->rules[psid].as_u64[0]);
323 u32 suffix = (addr >> d->suffix_shift) & d->suffix_mask;
324 u64 ea = d->ea_bits_len == 0 ? 0 : (((u64) suffix << d->psid_length)) | psid;
326 return clib_net_to_host_u64(d->ip6_prefix.as_u64[0]) | ea << d->ea_shift;
329 static_always_inline u64
330 map_get_pfx_net (map_domain_t *d, u32 addr, u16 port)
332 return clib_host_to_net_u64(map_get_pfx(d, clib_net_to_host_u32(addr),
333 clib_net_to_host_u16(port)));
339 static_always_inline u64
340 map_get_sfx (map_domain_t *d, u32 addr, u16 port)
342 u16 psid = (port >> d->psid_shift) & d->psid_mask;
344 /* Shared 1:1 mode. */
345 if (d->ea_bits_len == 0 && d->rules)
346 return clib_net_to_host_u64(d->rules[psid].as_u64[1]);
347 if (d->ip6_prefix_len == 128)
348 return clib_net_to_host_u64(d->ip6_prefix.as_u64[1]);
351 if (d->flags & MAP_DOMAIN_PREFIX)
352 return (u64) (addr & ~d->suffix_mask) << 16;
354 /* Shared or full IPv4 address */
355 return ((u64) addr << 16) | psid;
358 static_always_inline u64
359 map_get_sfx_net (map_domain_t *d, u32 addr, u16 port)
361 return clib_host_to_net_u64(map_get_sfx(d, clib_net_to_host_u32(addr),
362 clib_net_to_host_u16(port)));
365 static_always_inline u32
366 map_get_ip4 (ip6_address_t *addr)
368 return clib_host_to_net_u32(clib_net_to_host_u64(addr->as_u64[1]) >> 16);
372 * Get the MAP domain from an IPv4 lookup adjacency.
374 static_always_inline map_domain_t *
375 ip4_map_get_domain (u32 adj_index, u32 *map_domain_index)
377 map_main_t *mm = &map_main;
378 ip_lookup_main_t *lm = &ip4_main.lookup_main;
379 ip_adjacency_t *adj = ip_get_adjacency(lm, adj_index);
381 uword *p = (uword *)adj->rewrite_data;
383 *map_domain_index = p[0];
384 return pool_elt_at_index(mm->domains, p[0]);
388 * Get the MAP domain from an IPv6 lookup adjacency.
389 * If the IPv6 address or prefix is not shared, no lookup is required.
390 * The IPv4 address is used otherwise.
392 static_always_inline map_domain_t *
393 ip6_map_get_domain (u32 adj_index, ip4_address_t *addr,
394 u32 *map_domain_index, u8 *error)
396 map_main_t *mm = &map_main;
397 ip4_main_t *im4 = &ip4_main;
398 ip_lookup_main_t *lm4 = &ip4_main.lookup_main;
401 * Disable direct MAP domain lookup on decap, until the security check is updated to verify IPv4 SA.
402 * (That's done implicitly when MAP domain is looked up in the IPv4 FIB)
404 #ifdef MAP_NONSHARED_DOMAIN_ENABLED
405 ip_lookup_main_t *lm6 = &ip6_main.lookup_main;
406 ip_adjacency_t *adj = ip_get_adjacency(lm6, adj_index);
408 uword *p = (uword *)adj->rewrite_data;
410 *map_domain_index = p[0];
412 return pool_elt_at_index(mm->domains, p[0]);
415 u32 ai = ip4_fib_lookup_with_table(im4, 0, addr, 0);
416 ip_adjacency_t *adj4 = ip_get_adjacency (lm4, ai);
417 if (PREDICT_TRUE(adj4->lookup_next_index == IP_LOOKUP_NEXT_MAP ||
418 adj4->lookup_next_index == IP_LOOKUP_NEXT_MAP_T)) {
419 uword *p = (uword *)adj4->rewrite_data;
420 *map_domain_index = p[0];
421 return pool_elt_at_index(mm->domains, *map_domain_index);
423 *error = MAP_ERROR_NO_DOMAIN;
428 map_ip4_reass_get(u32 src, u32 dst, u16 fragment_id,
429 u8 protocol, u32 **pi_to_drop);
431 map_ip4_reass_free(map_ip4_reass_t *r, u32 **pi_to_drop);
433 #define map_ip4_reass_lock() while (__sync_lock_test_and_set(map_main.ip4_reass_lock, 1)) {}
434 #define map_ip4_reass_unlock() do {CLIB_MEMORY_BARRIER(); *map_main.ip4_reass_lock = 0;} while(0)
436 static_always_inline void
437 map_ip4_reass_get_fragments(map_ip4_reass_t *r, u32 **pi)
440 for (i=0; i<MAP_IP4_REASS_MAX_FRAGMENTS_PER_REASSEMBLY; i++)
441 if(r->fragments[i] != ~0) {
442 vec_add1(*pi, r->fragments[i]);
443 r->fragments[i] = ~0;
444 map_main.ip4_reass_buffered_counter--;
448 int map_ip4_reass_add_fragment(map_ip4_reass_t *r, u32 pi);
451 map_ip6_reass_get(ip6_address_t *src, ip6_address_t *dst, u32 fragment_id,
452 u8 protocol, u32 **pi_to_drop);
454 map_ip6_reass_free(map_ip6_reass_t *r, u32 **pi_to_drop);
456 #define map_ip6_reass_lock() while (__sync_lock_test_and_set(map_main.ip6_reass_lock, 1)) {}
457 #define map_ip6_reass_unlock() do {CLIB_MEMORY_BARRIER(); *map_main.ip6_reass_lock = 0;} while(0)
460 map_ip6_reass_add_fragment(map_ip6_reass_t *r, u32 pi,
461 u16 data_offset, u16 next_data_offset,
462 u8 *data_start, u16 data_len);
464 void map_ip4_drop_pi(u32 pi);
466 int map_ip4_reass_conf_ht_ratio(f32 ht_ratio, u32 *trashed_reass, u32 *dropped_packets);
467 #define MAP_IP4_REASS_CONF_HT_RATIO_MAX 100
468 int map_ip4_reass_conf_pool_size(u16 pool_size, u32 *trashed_reass, u32 *dropped_packets);
469 #define MAP_IP4_REASS_CONF_POOL_SIZE_MAX (0xfeff)
470 int map_ip4_reass_conf_lifetime(u16 lifetime_ms);
471 #define MAP_IP4_REASS_CONF_LIFETIME_MAX 0xffff
472 int map_ip4_reass_conf_buffers(u32 buffers);
473 #define MAP_IP4_REASS_CONF_BUFFERS_MAX (0xffffffff)
475 void map_ip6_drop_pi(u32 pi);
478 int map_ip6_reass_conf_ht_ratio(f32 ht_ratio, u32 *trashed_reass, u32 *dropped_packets);
479 #define MAP_IP6_REASS_CONF_HT_RATIO_MAX 100
480 int map_ip6_reass_conf_pool_size(u16 pool_size, u32 *trashed_reass, u32 *dropped_packets);
481 #define MAP_IP6_REASS_CONF_POOL_SIZE_MAX (0xfeff)
482 int map_ip6_reass_conf_lifetime(u16 lifetime_ms);
483 #define MAP_IP6_REASS_CONF_LIFETIME_MAX 0xffff
484 int map_ip6_reass_conf_buffers(u32 buffers);
485 #define MAP_IP6_REASS_CONF_BUFFERS_MAX (0xffffffff)
488 int ip6_parse(const ip6_header_t *ip6, u32 buff_len,
489 u8 *l4_protocol, u16 *l4_offset, u16 *frag_hdr_offset)
491 if (ip6->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION) {
492 *l4_protocol = ((ip6_frag_hdr_t *)(ip6 + 1))->next_hdr;
493 *frag_hdr_offset = sizeof(*ip6);
494 *l4_offset = sizeof(*ip6) + sizeof(ip6_frag_hdr_t);
496 *l4_protocol = ip6->protocol;
497 *frag_hdr_offset = 0;
498 *l4_offset = sizeof(*ip6);
501 return (buff_len < (*l4_offset + 4)) ||
502 (clib_net_to_host_u16(ip6->payload_length) < (*l4_offset + 4 - sizeof(*ip6)));
506 #define u8_ptr_add(ptr, index) (((u8 *)ptr) + index)
507 #define u16_net_add(u, val) clib_host_to_net_u16(clib_net_to_host_u16(u) + (val))
509 #define frag_id_6to4(id) ((id) ^ ((id) >> 16))
511 static_always_inline void
512 ip4_map_t_embedded_address (map_domain_t *d,
513 ip6_address_t *ip6, const ip4_address_t *ip4)
515 ASSERT(d->ip6_src_len == 96); //No support for other lengths for now
516 ip6->as_u64[0] = d->ip6_src.as_u64[0];
517 ip6->as_u32[2] = d->ip6_src.as_u32[2];
518 ip6->as_u32[3] = ip4->as_u32;
521 static_always_inline u32
522 ip6_map_t_embedded_address (map_domain_t *d, ip6_address_t *addr)
524 ASSERT(d->ip6_src_len == 96); //No support for other lengths for now
525 return addr->as_u32[3];
529 map_domain_counter_lock (map_main_t *mm)
531 if (mm->counter_lock)
532 while (__sync_lock_test_and_set(mm->counter_lock, 1))
536 map_domain_counter_unlock (map_main_t *mm)
538 if (mm->counter_lock)
539 *mm->counter_lock = 0;
543 static_always_inline void
544 map_send_all_to_node(vlib_main_t *vm, u32 *pi_vector,
545 vlib_node_runtime_t *node, vlib_error_t *error,
548 u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
549 //Deal with fragments that are ready
551 n_left_from = vec_len(pi_vector);
552 next_index = node->cached_next_index;
553 while (n_left_from > 0) {
554 vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
555 while (n_left_from > 0 && n_left_to_next > 0) {
556 u32 pi0 = to_next[0] = from[0];
561 vlib_buffer_t *p0 = vlib_get_buffer(vm, pi0);
563 vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, pi0, next);
565 vlib_put_next_frame(vm, node, next_index, n_left_to_next);