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.
17 #include <vnet/fib/ip4_fib.h>
19 #include <vnet/gre/packet.h>
20 #include <lb/lbhash.h>
22 #define foreach_lb_error \
24 _(PROTO_NOT_SUPPORTED, "protocol not supported")
28 #define _(sym,str) LB_ERROR_##sym,
34 static char *lb_error_strings[] =
36 #define _(sym,string) string,
52 } lb_nodeport_trace_t;
63 format_lb_trace (u8 * s, va_list * args)
65 lb_main_t *lbm = &lb_main;
66 CLIB_UNUSED(vlib_main_t * vm)
67 = va_arg (*args, vlib_main_t *);
68 CLIB_UNUSED(vlib_node_t * node)
69 = va_arg (*args, vlib_node_t *);
70 lb_trace_t *t = va_arg (*args, lb_trace_t *);
71 if (pool_is_free_index(lbm->vips, t->vip_index))
73 s = format (s, "lb vip[%d]: This VIP was freed since capture\n");
77 s = format (s, "lb vip[%d]: %U\n", t->vip_index, format_lb_vip,
78 &lbm->vips[t->vip_index]);
80 if (pool_is_free_index(lbm->ass, t->as_index))
82 s = format (s, "lb as[%d]: This AS was freed since capture\n");
86 s = format (s, "lb as[%d]: %U\n", t->as_index, format_lb_as,
87 &lbm->ass[t->as_index]);
93 format_lb_nat_trace (u8 * s, va_list * args)
95 lb_main_t *lbm = &lb_main;
96 CLIB_UNUSED(vlib_main_t * vm)
97 = va_arg (*args, vlib_main_t *);
98 CLIB_UNUSED(vlib_node_t * node)
99 = va_arg (*args, vlib_node_t *);
100 lb_nat_trace_t *t = va_arg (*args, lb_nat_trace_t *);
102 if (pool_is_free_index(lbm->vips, t->vip_index))
104 s = format (s, "lb vip[%d]: This VIP was freed since capture\n");
108 s = format (s, "lb vip[%d]: %U\n", t->vip_index, format_lb_vip,
109 &lbm->vips[t->vip_index]);
111 if (pool_is_free_index(lbm->ass, t->as_index))
113 s = format (s, "lb as[%d]: This AS was freed since capture\n");
117 s = format (s, "lb as[%d]: %U\n", t->as_index, format_lb_as,
118 &lbm->ass[t->as_index]);
120 s = format (s, "lb nat: rx_sw_if_index = %d, next_index = %d",
121 t->rx_sw_if_index, t->next_index);
127 lb_get_sticky_table (u32 thread_index)
129 lb_main_t *lbm = &lb_main;
130 lb_hash_t *sticky_ht = lbm->per_cpu[thread_index].sticky_ht;
131 //Check if size changed
133 sticky_ht && (lbm->per_cpu_sticky_buckets != lb_hash_nbuckets(sticky_ht))))
135 //Dereference everything in there
138 lb_hash_foreach_entry(sticky_ht, b, i)
140 vlib_refcount_add (&lbm->as_refcount, thread_index, b->value[i], -1);
141 vlib_refcount_add (&lbm->as_refcount, thread_index, 0, 1);
144 lb_hash_free (sticky_ht);
148 //Create if necessary
149 if (PREDICT_FALSE(sticky_ht == NULL))
151 lbm->per_cpu[thread_index].sticky_ht = lb_hash_alloc (
152 lbm->per_cpu_sticky_buckets, lbm->flow_timeout);
153 sticky_ht = lbm->per_cpu[thread_index].sticky_ht;
154 clib_warning("Regenerated sticky table %p", sticky_ht);
160 sticky_ht->timeout = lbm->flow_timeout;
165 lb_node_get_other_ports4 (ip4_header_t *ip40)
171 lb_node_get_other_ports6 (ip6_header_t *ip60)
176 static_always_inline void
177 lb_node_get_hash (lb_main_t *lbm, vlib_buffer_t *p, u8 is_input_v4,
178 u32 *hash, u32 *vip_idx, u8 per_port_vip)
181 clib_bihash_kv_8_8_t kv, value;
183 /* For vip case, retrieve vip index for ip lookup */
184 *vip_idx = vnet_buffer (p)->ip.adj_index[VLIB_TX];
188 /* For per-port-vip case, ip lookup stores placeholder index */
189 key.vip_prefix_index = *vip_idx;
197 ip40 = vlib_buffer_get_current (p);
199 ip40->protocol == IP_PROTOCOL_TCP
200 || ip40->protocol == IP_PROTOCOL_UDP))
201 ports = ((u64) ((udp_header_t *) (ip40 + 1))->src_port << 16)
202 | ((u64) ((udp_header_t *) (ip40 + 1))->dst_port);
204 ports = lb_node_get_other_ports4 (ip40);
206 *hash = lb_hash_hash (*((u64 *) &ip40->address_pair), ports, 0, 0, 0);
210 key.protocol = ip40->protocol;
211 key.port = (u16)(ports & 0xFFFF);
217 ip60 = vlib_buffer_get_current (p);
221 ip60->protocol == IP_PROTOCOL_TCP
222 || ip60->protocol == IP_PROTOCOL_UDP))
223 ports = ((u64) ((udp_header_t *) (ip60 + 1))->src_port << 16)
224 | ((u64) ((udp_header_t *) (ip60 + 1))->dst_port);
226 ports = lb_node_get_other_ports6 (ip60);
228 *hash = lb_hash_hash (ip60->src_address.as_u64[0],
229 ip60->src_address.as_u64[1],
230 ip60->dst_address.as_u64[0],
231 ip60->dst_address.as_u64[1], ports);
235 key.protocol = ip60->protocol;
236 key.port = (u16)(ports & 0xFFFF);
240 /* For per-port-vip case, retrieve vip index for vip_port_filter table */
244 if (clib_bihash_search_8_8(&lbm->vip_index_per_port, &kv, &value) < 0)
246 /* return default vip */
250 *vip_idx = value.value;
254 static_always_inline uword
255 lb_node_fn (vlib_main_t * vm,
256 vlib_node_runtime_t * node,
257 vlib_frame_t * frame,
258 u8 is_input_v4, //Compile-time parameter stating that is input is v4 (or v6)
259 lb_encap_type_t encap_type, //Compile-time parameter is GRE4/GRE6/L3DSR/NAT4/NAT6
260 u8 per_port_vip) //Compile-time parameter stating that is per_port_vip or not
262 lb_main_t *lbm = &lb_main;
263 u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
264 u32 thread_index = vm->thread_index;
265 u32 lb_time = lb_hash_time_now (vm);
267 lb_hash_t *sticky_ht = lb_get_sticky_table (thread_index);
268 from = vlib_frame_vector_args (frame);
269 n_left_from = frame->n_vectors;
270 next_index = node->cached_next_index;
273 u32 next_vip_idx0 = ~0;
274 if (PREDICT_TRUE(n_left_from > 0))
276 vlib_buffer_t *p0 = vlib_get_buffer (vm, from[0]);
277 lb_node_get_hash (lbm, p0, is_input_v4, &nexthash0,
278 &next_vip_idx0, per_port_vip);
281 while (n_left_from > 0)
283 vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
284 while (n_left_from > 0 && n_left_to_next > 0)
291 u32 available_index0;
293 u32 hash0 = nexthash0;
294 u32 vip_index0 = next_vip_idx0;
297 if (PREDICT_TRUE(n_left_from > 1))
299 vlib_buffer_t *p1 = vlib_get_buffer (vm, from[1]);
300 //Compute next hash and prefetch bucket
301 lb_node_get_hash (lbm, p1, is_input_v4,
302 &nexthash0, &next_vip_idx0,
304 lb_hash_prefetch_bucket (sticky_ht, nexthash0);
305 //Prefetch for encap, next
306 CLIB_PREFETCH(vlib_buffer_get_current (p1) - 64, 64, STORE);
309 if (PREDICT_TRUE(n_left_from > 2))
312 p2 = vlib_get_buffer (vm, from[2]);
313 /* prefetch packet header and data */
314 vlib_prefetch_buffer_header(p2, STORE);
315 CLIB_PREFETCH(vlib_buffer_get_current (p2), 64, STORE);
318 pi0 = to_next[0] = from[0];
324 p0 = vlib_get_buffer (vm, pi0);
326 vip0 = pool_elt_at_index(lbm->vips, vip_index0);
331 ip40 = vlib_buffer_get_current (p0);
332 len0 = clib_net_to_host_u16 (ip40->length);
337 ip60 = vlib_buffer_get_current (p0);
338 len0 = clib_net_to_host_u16 (ip60->payload_length)
339 + sizeof(ip6_header_t);
342 lb_hash_get (sticky_ht, hash0,
344 &available_index0, &asindex0);
346 if (PREDICT_TRUE(asindex0 != 0))
348 //Found an existing entry
349 counter = LB_VIP_COUNTER_NEXT_PACKET;
351 else if (PREDICT_TRUE(available_index0 != ~0))
353 //There is an available slot for a new flow
355 vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].as_index;
356 counter = LB_VIP_COUNTER_FIRST_PACKET;
357 counter = (asindex0 == 0) ? LB_VIP_COUNTER_NO_SERVER : counter;
359 //TODO: There are race conditions with as0 and vip0 manipulation.
360 //Configuration may be changed, vectors resized, etc...
362 //Dereference previously used
364 &lbm->as_refcount, thread_index,
365 lb_hash_available_value (sticky_ht, hash0, available_index0),
367 vlib_refcount_add (&lbm->as_refcount, thread_index, asindex0, 1);
370 //Note that when there is no AS configured, an entry is configured anyway.
371 //But no configured AS is not something that should happen
372 lb_hash_put (sticky_ht, hash0, asindex0,
374 available_index0, lb_time);
378 //Could not store new entry in the table
380 vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].as_index;
381 counter = LB_VIP_COUNTER_UNTRACKED_PACKET;
384 vlib_increment_simple_counter (
385 &lbm->vip_counters[counter], thread_index,
390 if ((encap_type == LB_ENCAP_TYPE_GRE4)
391 || (encap_type == LB_ENCAP_TYPE_GRE6))
394 if (encap_type == LB_ENCAP_TYPE_GRE4) /* encap GRE4*/
397 vlib_buffer_advance (
398 p0, -sizeof(ip4_header_t) - sizeof(gre_header_t));
399 ip40 = vlib_buffer_get_current (p0);
400 gre0 = (gre_header_t *) (ip40 + 1);
401 ip40->src_address = lbm->ip4_src_address;
402 ip40->dst_address = lbm->ass[asindex0].address.ip4;
403 ip40->ip_version_and_header_length = 0x45;
405 ip40->fragment_id = 0;
406 ip40->flags_and_fragment_offset = 0;
407 ip40->length = clib_host_to_net_u16 (
408 len0 + sizeof(gre_header_t) + sizeof(ip4_header_t));
409 ip40->protocol = IP_PROTOCOL_GRE;
410 ip40->checksum = ip4_header_checksum (ip40);
415 vlib_buffer_advance (
416 p0, -sizeof(ip6_header_t) - sizeof(gre_header_t));
417 ip60 = vlib_buffer_get_current (p0);
418 gre0 = (gre_header_t *) (ip60 + 1);
419 ip60->dst_address = lbm->ass[asindex0].address.ip6;
420 ip60->src_address = lbm->ip6_src_address;
421 ip60->hop_limit = 128;
422 ip60->ip_version_traffic_class_and_flow_label =
423 clib_host_to_net_u32 (0x6 << 28);
424 ip60->payload_length = clib_host_to_net_u16 (
425 len0 + sizeof(gre_header_t));
426 ip60->protocol = IP_PROTOCOL_GRE;
429 gre0->flags_and_version = 0;
432 clib_host_to_net_u16 (0x0800) :
433 clib_host_to_net_u16 (0x86DD);
435 else if (encap_type == LB_ENCAP_TYPE_L3DSR) /* encap L3DSR*/
439 u32 old_dst, new_dst;
442 ip40 = vlib_buffer_get_current (p0);
443 old_dst = ip40->dst_address.as_u32;
444 new_dst = lbm->ass[asindex0].address.ip4.as_u32;
445 ip40->dst_address.as_u32 = lbm->ass[asindex0].address.ip4.as_u32;
446 /* Get and rewrite DSCP bit */
448 new_tos = (u8) ((vip0->encap_args.dscp & 0x3F) << 2);
449 ip40->tos = (u8) ((vip0->encap_args.dscp & 0x3F) << 2);
451 csum = ip40->checksum;
452 csum = ip_csum_update (csum, old_tos, new_tos,
454 tos /* changed member */);
455 csum = ip_csum_update (csum, old_dst, new_dst,
457 dst_address /* changed member */);
458 ip40->checksum = ip_csum_fold (csum);
460 /* Recomputing L4 checksum after dst-IP modifying */
461 if (ip40->protocol == IP_PROTOCOL_TCP)
464 th0 = ip4_next_header (ip40);
466 th0->checksum = ip4_tcp_udp_compute_checksum (vm, p0, ip40);
468 else if (ip40->protocol == IP_PROTOCOL_UDP)
471 uh0 = ip4_next_header (ip40);
473 uh0->checksum = ip4_tcp_udp_compute_checksum (vm, p0, ip40);
476 else if ((encap_type == LB_ENCAP_TYPE_NAT4)
477 || (encap_type == LB_ENCAP_TYPE_NAT6))
483 if ((is_input_v4 == 1) && (encap_type == LB_ENCAP_TYPE_NAT4))
488 ip40 = vlib_buffer_get_current (p0);
489 uh = (udp_header_t *) (ip40 + 1);
490 old_dst = ip40->dst_address.as_u32;
491 ip40->dst_address = lbm->ass[asindex0].address.ip4;
493 csum = ip40->checksum;
494 csum = ip_csum_sub_even (csum, old_dst);
495 csum = ip_csum_add_even (
496 csum, lbm->ass[asindex0].address.ip4.as_u32);
497 ip40->checksum = ip_csum_fold (csum);
499 if (ip40->protocol == IP_PROTOCOL_UDP)
501 uh->dst_port = vip0->encap_args.target_port;
503 csum = ip_csum_sub_even (csum, old_dst);
504 csum = ip_csum_add_even (
505 csum, lbm->ass[asindex0].address.ip4.as_u32);
506 uh->checksum = ip_csum_fold (csum);
513 else if ((is_input_v4 == 0) && (encap_type == LB_ENCAP_TYPE_NAT6))
517 ip6_address_t old_dst;
519 ip60 = vlib_buffer_get_current (p0);
520 uh = (udp_header_t *) (ip60 + 1);
522 old_dst.as_u64[0] = ip60->dst_address.as_u64[0];
523 old_dst.as_u64[1] = ip60->dst_address.as_u64[1];
524 ip60->dst_address.as_u64[0] =
525 lbm->ass[asindex0].address.ip6.as_u64[0];
526 ip60->dst_address.as_u64[1] =
527 lbm->ass[asindex0].address.ip6.as_u64[1];
529 if (PREDICT_TRUE(ip60->protocol == IP_PROTOCOL_UDP))
531 uh->dst_port = vip0->encap_args.target_port;
533 csum = ip_csum_sub_even (csum, old_dst.as_u64[0]);
534 csum = ip_csum_sub_even (csum, old_dst.as_u64[1]);
535 csum = ip_csum_add_even (
536 csum, lbm->ass[asindex0].address.ip6.as_u64[0]);
537 csum = ip_csum_add_even (
538 csum, lbm->ass[asindex0].address.ip6.as_u64[1]);
539 uh->checksum = ip_csum_fold (csum);
547 next0 = lbm->ass[asindex0].dpo.dpoi_next_node;
548 //Note that this is going to error if asindex0 == 0
549 vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
550 lbm->ass[asindex0].dpo.dpoi_index;
552 if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
554 lb_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof(*tr));
555 tr->as_index = asindex0;
556 tr->vip_index = vip_index0;
560 vlib_validate_buffer_enqueue_x1(
561 vm, node, next_index, to_next, n_left_to_next, pi0, next0);
563 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
566 return frame->n_vectors;
570 format_nodeport_lb_trace (u8 * s, va_list * args)
572 lb_main_t *lbm = &lb_main;
573 CLIB_UNUSED(vlib_main_t * vm)
574 = va_arg (*args, vlib_main_t *);
575 CLIB_UNUSED(vlib_node_t * node)
576 = va_arg (*args, vlib_node_t *);
577 lb_nodeport_trace_t *t = va_arg (*args, lb_nodeport_trace_t *);
578 if (pool_is_free_index(lbm->vips, t->vip_index))
580 s = format (s, "lb vip[%d]: This VIP was freed since capture\n");
584 s = format (s, "lb vip[%d]: %U\n", t->vip_index, format_lb_vip,
585 &lbm->vips[t->vip_index]);
588 s = format (s, " lb node_port: %d", t->node_port);
594 lb_nodeport_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
595 vlib_frame_t * frame, u8 is_input_v4)
597 lb_main_t *lbm = &lb_main;
598 u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
600 from = vlib_frame_vector_args (frame);
601 n_left_from = frame->n_vectors;
602 next_index = node->cached_next_index;
604 while (n_left_from > 0)
606 vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
608 while (n_left_from > 0 && n_left_to_next > 0)
612 udp_header_t * udp_0;
615 if (PREDICT_TRUE(n_left_from > 1))
617 vlib_buffer_t *p1 = vlib_get_buffer (vm, from[1]);
618 //Prefetch for encap, next
619 CLIB_PREFETCH(vlib_buffer_get_current (p1) - 64, 64, STORE);
622 if (PREDICT_TRUE(n_left_from > 2))
625 p2 = vlib_get_buffer (vm, from[2]);
626 /* prefetch packet header and data */
627 vlib_prefetch_buffer_header(p2, STORE);
628 CLIB_PREFETCH(vlib_buffer_get_current (p2), 64, STORE);
631 pi0 = to_next[0] = from[0];
637 p0 = vlib_get_buffer (vm, pi0);
642 vlib_buffer_advance (
643 p0, -(word) (sizeof(udp_header_t) + sizeof(ip4_header_t)));
644 ip40 = vlib_buffer_get_current (p0);
645 udp_0 = (udp_header_t *) (ip40 + 1);
650 vlib_buffer_advance (
651 p0, -(word) (sizeof(udp_header_t) + sizeof(ip6_header_t)));
652 ip60 = vlib_buffer_get_current (p0);
653 udp_0 = (udp_header_t *) (ip60 + 1);
656 entry0 = hash_get_mem(lbm->vip_index_by_nodeport, &(udp_0->dst_port));
659 vnet_buffer(p0)->ip.adj_index[VLIB_TX] = entry0 ? entry0[0]
662 if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
664 lb_nodeport_trace_t *tr = vlib_add_trace (vm, node, p0,
666 tr->vip_index = entry0 ? entry0[0] : ADJ_INDEX_INVALID;
667 tr->node_port = (u32) clib_net_to_host_u16 (udp_0->dst_port);
670 vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
673 LB4_NODEPORT_NEXT_IP4_NAT4 : LB6_NODEPORT_NEXT_IP6_NAT6);
675 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
678 return frame->n_vectors;
683 * @brief Match NAT44 static mapping.
685 * @param sm NAT main.
686 * @param match Address and port to match.
687 * @param index index to the pool.
689 * @returns 0 if match found, otherwise -1.
692 lb_nat44_mapping_match (lb_main_t *lbm, lb_snat4_key_t * match, u32 *index)
694 clib_bihash_kv_8_8_t kv4, value;
695 clib_bihash_8_8_t *mapping_hash = &lbm->mapping_by_as4;
697 kv4.key = match->as_u64;
699 if (clib_bihash_search_8_8 (mapping_hash, &kv4, &value))
704 *index = value.value;
709 * @brief Match NAT66 static mapping.
711 * @param sm NAT main.
712 * @param match Address and port to match.
713 * @param mapping External or local address and port of the matched mapping.
715 * @returns 0 if match found otherwise 1.
718 lb_nat66_mapping_match (lb_main_t *lbm, lb_snat6_key_t * match, u32 *index)
720 clib_bihash_kv_24_8_t kv6, value;
721 lb_snat6_key_t m_key6;
722 clib_bihash_24_8_t *mapping_hash = &lbm->mapping_by_as6;
724 m_key6.addr.as_u64[0] = match->addr.as_u64[0];
725 m_key6.addr.as_u64[1] = match->addr.as_u64[1];
726 m_key6.port = match->port;
728 m_key6.fib_index = 0;
730 kv6.key[0] = m_key6.as_u64[0];
731 kv6.key[1] = m_key6.as_u64[1];
732 kv6.key[2] = m_key6.as_u64[2];
734 if (clib_bihash_search_24_8 (mapping_hash, &kv6, &value))
739 *index = value.value;
744 lb_nat_in2out_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
745 vlib_frame_t * frame, u32 is_nat4)
747 u32 n_left_from, *from, *to_next;
749 u32 pkts_processed = 0;
750 lb_main_t *lbm = &lb_main;
751 u32 stats_node_index;
754 is_nat4 ? lb_nat4_in2out_node.index : lb_nat6_in2out_node.index;
756 from = vlib_frame_vector_args (frame);
757 n_left_from = frame->n_vectors;
758 next_index = node->cached_next_index;
760 while (n_left_from > 0)
764 vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
766 while (n_left_from > 0 && n_left_to_next > 0)
773 u16 old_port0, new_port0;
780 /* speculatively enqueue b0 to the current next frame */
788 b0 = vlib_get_buffer (vm, bi0);
789 next0 = LB_NAT4_IN2OUT_NEXT_LOOKUP;
790 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
791 rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (
797 u32 old_addr0, new_addr0;
798 lb_snat4_key_t key40;
799 lb_snat_mapping_t *sm40;
802 ip40 = vlib_buffer_get_current (b0);
803 udp0 = ip4_next_header (ip40);
804 tcp0 = (tcp_header_t *) udp0;
805 proto0 = lb_ip_proto_to_nat_proto (ip40->protocol);
807 key40.addr = ip40->src_address;
808 key40.protocol = proto0;
809 key40.port = udp0->src_port;
810 key40.fib_index = rx_fib_index0;
812 if (lb_nat44_mapping_match (lbm, &key40, &index40))
814 next0 = LB_NAT4_IN2OUT_NEXT_DROP;
818 sm40 = pool_elt_at_index(lbm->snat_mappings, index40);
819 new_addr0 = sm40->src_ip.ip4.as_u32;
820 new_port0 = sm40->src_port;
821 vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm40->fib_index;
822 old_addr0 = ip40->src_address.as_u32;
823 ip40->src_address.as_u32 = new_addr0;
825 csum = ip40->checksum;
826 csum = ip_csum_sub_even (csum, old_addr0);
827 csum = ip_csum_add_even (csum, new_addr0);
828 ip40->checksum = ip_csum_fold (csum);
830 if (PREDICT_TRUE(proto0 == LB_NAT_PROTOCOL_TCP))
832 old_port0 = tcp0->src_port;
833 tcp0->src_port = new_port0;
835 csum = tcp0->checksum;
836 csum = ip_csum_sub_even (csum, old_addr0);
837 csum = ip_csum_sub_even (csum, old_port0);
838 csum = ip_csum_add_even (csum, new_addr0);
839 csum = ip_csum_add_even (csum, new_port0);
840 tcp0->checksum = ip_csum_fold (csum);
842 else if (PREDICT_TRUE(proto0 == LB_NAT_PROTOCOL_UDP))
844 old_port0 = udp0->src_port;
845 udp0->src_port = new_port0;
847 csum = udp0->checksum;
848 csum = ip_csum_sub_even (csum, old_addr0);
849 csum = ip_csum_sub_even (csum, old_port0);
850 csum = ip_csum_add_even (csum, new_addr0);
851 csum = ip_csum_add_even (csum, new_port0);
852 udp0->checksum = ip_csum_fold (csum);
855 pkts_processed += next0 != LB_NAT4_IN2OUT_NEXT_DROP;
860 ip6_address_t old_addr0, new_addr0;
861 lb_snat6_key_t key60;
862 lb_snat_mapping_t *sm60;
865 ip60 = vlib_buffer_get_current (b0);
866 udp0 = ip6_next_header (ip60);
867 tcp0 = (tcp_header_t *) udp0;
868 proto0 = lb_ip_proto_to_nat_proto (ip60->protocol);
870 key60.addr.as_u64[0] = ip60->src_address.as_u64[0];
871 key60.addr.as_u64[1] = ip60->src_address.as_u64[1];
872 key60.protocol = proto0;
873 key60.port = udp0->src_port;
874 key60.fib_index = rx_fib_index0;
876 if (lb_nat66_mapping_match (lbm, &key60, &index60))
878 next0 = LB_NAT6_IN2OUT_NEXT_DROP;
882 sm60 = pool_elt_at_index(lbm->snat_mappings, index60);
883 new_addr0.as_u64[0] = sm60->src_ip.as_u64[0];
884 new_addr0.as_u64[1] = sm60->src_ip.as_u64[1];
885 new_port0 = sm60->src_port;
886 vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm60->fib_index;
887 old_addr0.as_u64[0] = ip60->src_address.as_u64[0];
888 old_addr0.as_u64[1] = ip60->src_address.as_u64[1];
889 ip60->src_address.as_u64[0] = new_addr0.as_u64[0];
890 ip60->src_address.as_u64[1] = new_addr0.as_u64[1];
892 if (PREDICT_TRUE(proto0 == LB_NAT_PROTOCOL_TCP))
894 old_port0 = tcp0->src_port;
895 tcp0->src_port = new_port0;
897 csum = tcp0->checksum;
898 csum = ip_csum_sub_even (csum, old_addr0.as_u64[0]);
899 csum = ip_csum_sub_even (csum, old_addr0.as_u64[1]);
900 csum = ip_csum_add_even (csum, new_addr0.as_u64[0]);
901 csum = ip_csum_add_even (csum, new_addr0.as_u64[1]);
902 csum = ip_csum_sub_even (csum, old_port0);
903 csum = ip_csum_add_even (csum, new_port0);
904 tcp0->checksum = ip_csum_fold (csum);
906 else if (PREDICT_TRUE(proto0 == LB_NAT_PROTOCOL_UDP))
908 old_port0 = udp0->src_port;
909 udp0->src_port = new_port0;
911 csum = udp0->checksum;
912 csum = ip_csum_sub_even (csum, old_addr0.as_u64[0]);
913 csum = ip_csum_sub_even (csum, old_addr0.as_u64[1]);
914 csum = ip_csum_add_even (csum, new_addr0.as_u64[0]);
915 csum = ip_csum_add_even (csum, new_addr0.as_u64[1]);
916 csum = ip_csum_sub_even (csum, old_port0);
917 csum = ip_csum_add_even (csum, new_port0);
918 udp0->checksum = ip_csum_fold (csum);
921 pkts_processed += next0 != LB_NAT4_IN2OUT_NEXT_DROP;
924 trace0: if (PREDICT_FALSE(
925 (node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED)))
927 lb_nat_trace_t *t = vlib_add_trace (vm, node, b0, sizeof(*t));
928 t->rx_sw_if_index = sw_if_index0;
929 t->next_index = next0;
932 /* verify speculative enqueue, maybe switch current next frame */
933 vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
934 n_left_to_next, bi0, next0);
937 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
940 vlib_node_increment_counter (vm, stats_node_index,
941 LB_NAT_IN2OUT_ERROR_IN2OUT_PACKETS,
943 return frame->n_vectors;
947 lb6_gre6_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
948 vlib_frame_t * frame)
950 return lb_node_fn (vm, node, frame, 0, LB_ENCAP_TYPE_GRE6, 0);
954 lb6_gre4_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
955 vlib_frame_t * frame)
957 return lb_node_fn (vm, node, frame, 0, LB_ENCAP_TYPE_GRE4, 0);
961 lb4_gre6_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
962 vlib_frame_t * frame)
964 return lb_node_fn (vm, node, frame, 1, LB_ENCAP_TYPE_GRE6, 0);
968 lb4_gre4_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
969 vlib_frame_t * frame)
971 return lb_node_fn (vm, node, frame, 1, LB_ENCAP_TYPE_GRE4, 0);
975 lb6_gre6_port_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
976 vlib_frame_t * frame)
978 return lb_node_fn (vm, node, frame, 0, LB_ENCAP_TYPE_GRE6, 1);
982 lb6_gre4_port_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
983 vlib_frame_t * frame)
985 return lb_node_fn (vm, node, frame, 0, LB_ENCAP_TYPE_GRE4, 1);
989 lb4_gre6_port_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
990 vlib_frame_t * frame)
992 return lb_node_fn (vm, node, frame, 1, LB_ENCAP_TYPE_GRE6, 1);
996 lb4_gre4_port_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
997 vlib_frame_t * frame)
999 return lb_node_fn (vm, node, frame, 1, LB_ENCAP_TYPE_GRE4, 1);
1003 lb4_l3dsr_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1004 vlib_frame_t * frame)
1006 return lb_node_fn (vm, node, frame, 1, LB_ENCAP_TYPE_L3DSR, 0);
1010 lb4_l3dsr_port_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1011 vlib_frame_t * frame)
1013 return lb_node_fn (vm, node, frame, 1, LB_ENCAP_TYPE_L3DSR, 1);
1017 lb6_nat6_port_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1018 vlib_frame_t * frame)
1020 return lb_node_fn (vm, node, frame, 0, LB_ENCAP_TYPE_NAT6, 1);
1024 lb4_nat4_port_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1025 vlib_frame_t * frame)
1027 return lb_node_fn (vm, node, frame, 1, LB_ENCAP_TYPE_NAT4, 1);
1031 lb_nat4_in2out_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1032 vlib_frame_t * frame)
1034 return lb_nat_in2out_node_fn (vm, node, frame, 1);
1038 lb_nat6_in2out_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1039 vlib_frame_t * frame)
1041 return lb_nat_in2out_node_fn (vm, node, frame, 0);
1044 VLIB_REGISTER_NODE (lb6_gre6_node) =
1046 .function = lb6_gre6_node_fn,
1048 .vector_size = sizeof(u32),
1049 .format_trace = format_lb_trace,
1050 .n_errors = LB_N_ERROR,
1051 .error_strings = lb_error_strings,
1052 .n_next_nodes = LB_N_NEXT,
1054 { [LB_NEXT_DROP] = "error-drop" },
1057 VLIB_REGISTER_NODE (lb6_gre4_node) =
1059 .function = lb6_gre4_node_fn,
1061 .vector_size = sizeof(u32),
1062 .format_trace = format_lb_trace,
1063 .n_errors = LB_N_ERROR,
1064 .error_strings = lb_error_strings,
1065 .n_next_nodes = LB_N_NEXT,
1067 { [LB_NEXT_DROP] = "error-drop" },
1070 VLIB_REGISTER_NODE (lb4_gre6_node) =
1072 .function = lb4_gre6_node_fn,
1074 .vector_size = sizeof(u32),
1075 .format_trace = format_lb_trace,
1076 .n_errors = LB_N_ERROR,
1077 .error_strings = lb_error_strings,
1078 .n_next_nodes = LB_N_NEXT,
1080 { [LB_NEXT_DROP] = "error-drop" },
1083 VLIB_REGISTER_NODE (lb4_gre4_node) =
1085 .function = lb4_gre4_node_fn,
1087 .vector_size = sizeof(u32),
1088 .format_trace = format_lb_trace,
1089 .n_errors = LB_N_ERROR,
1090 .error_strings = lb_error_strings,
1091 .n_next_nodes = LB_N_NEXT,
1093 { [LB_NEXT_DROP] = "error-drop" },
1096 VLIB_REGISTER_NODE (lb6_gre6_port_node) =
1098 .function = lb6_gre6_port_node_fn,
1099 .name = "lb6-gre6-port",
1100 .vector_size = sizeof(u32),
1101 .format_trace = format_lb_trace,
1102 .n_errors = LB_N_ERROR,
1103 .error_strings = lb_error_strings,
1104 .n_next_nodes = LB_N_NEXT,
1106 { [LB_NEXT_DROP] = "error-drop" },
1109 VLIB_REGISTER_NODE (lb6_gre4_port_node) =
1111 .function = lb6_gre4_port_node_fn,
1112 .name = "lb6-gre4-port",
1113 .vector_size = sizeof(u32),
1114 .format_trace = format_lb_trace,
1115 .n_errors = LB_N_ERROR,
1116 .error_strings = lb_error_strings,
1117 .n_next_nodes = LB_N_NEXT,
1119 { [LB_NEXT_DROP] = "error-drop" },
1122 VLIB_REGISTER_NODE (lb4_gre6_port_node) =
1124 .function = lb4_gre6_port_node_fn,
1125 .name = "lb4-gre6-port",
1126 .vector_size = sizeof(u32),
1127 .format_trace = format_lb_trace,
1128 .n_errors = LB_N_ERROR,
1129 .error_strings = lb_error_strings,
1130 .n_next_nodes = LB_N_NEXT,
1132 { [LB_NEXT_DROP] = "error-drop" },
1135 VLIB_REGISTER_NODE (lb4_gre4_port_node) =
1137 .function = lb4_gre4_port_node_fn,
1138 .name = "lb4-gre4-port",
1139 .vector_size = sizeof(u32),
1140 .format_trace = format_lb_trace,
1141 .n_errors = LB_N_ERROR,
1142 .error_strings = lb_error_strings,
1143 .n_next_nodes = LB_N_NEXT,
1145 { [LB_NEXT_DROP] = "error-drop" },
1148 VLIB_REGISTER_NODE (lb4_l3dsr_port_node) =
1150 .function = lb4_l3dsr_port_node_fn,
1151 .name = "lb4-l3dsr-port",
1152 .vector_size = sizeof(u32),
1153 .format_trace = format_lb_trace,
1154 .n_errors = LB_N_ERROR,
1155 .error_strings = lb_error_strings,
1156 .n_next_nodes = LB_N_NEXT,
1158 { [LB_NEXT_DROP] = "error-drop" },
1161 VLIB_REGISTER_NODE (lb4_l3dsr_node) =
1163 .function = lb4_l3dsr_node_fn,
1164 .name = "lb4-l3dsr",
1165 .vector_size = sizeof(u32),
1166 .format_trace = format_lb_trace,
1167 .n_errors = LB_N_ERROR,
1168 .error_strings = lb_error_strings,
1169 .n_next_nodes = LB_N_NEXT,
1171 { [LB_NEXT_DROP] = "error-drop" },
1174 VLIB_REGISTER_NODE (lb6_nat6_port_node) =
1176 .function = lb6_nat6_port_node_fn,
1177 .name = "lb6-nat6-port",
1178 .vector_size = sizeof(u32),
1179 .format_trace = format_lb_trace,
1180 .n_errors = LB_N_ERROR,
1181 .error_strings = lb_error_strings,
1182 .n_next_nodes = LB_N_NEXT,
1184 { [LB_NEXT_DROP] = "error-drop" },
1187 VLIB_REGISTER_NODE (lb4_nat4_port_node) =
1189 .function = lb4_nat4_port_node_fn,
1190 .name = "lb4-nat4-port",
1191 .vector_size = sizeof(u32),
1192 .format_trace = format_lb_trace,
1193 .n_errors = LB_N_ERROR,
1194 .error_strings = lb_error_strings,
1195 .n_next_nodes = LB_N_NEXT,
1197 { [LB_NEXT_DROP] = "error-drop" },
1201 lb4_nodeport_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1202 vlib_frame_t * frame)
1204 return lb_nodeport_node_fn (vm, node, frame, 1);
1208 lb6_nodeport_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
1209 vlib_frame_t * frame)
1211 return lb_nodeport_node_fn (vm, node, frame, 0);
1214 VLIB_REGISTER_NODE (lb4_nodeport_node) =
1216 .function = lb4_nodeport_node_fn,
1217 .name = "lb4-nodeport",
1218 .vector_size = sizeof(u32),
1219 .format_trace = format_nodeport_lb_trace,
1220 .n_errors = LB_N_ERROR,
1221 .error_strings = lb_error_strings,
1222 .n_next_nodes = LB4_NODEPORT_N_NEXT,
1225 [LB4_NODEPORT_NEXT_IP4_NAT4] = "lb4-nat4-port",
1226 [LB4_NODEPORT_NEXT_DROP] = "error-drop",
1230 VLIB_REGISTER_NODE (lb6_nodeport_node) =
1232 .function = lb6_nodeport_node_fn,
1233 .name = "lb6-nodeport",
1234 .vector_size = sizeof(u32),
1235 .format_trace = format_nodeport_lb_trace,
1236 .n_errors = LB_N_ERROR,
1237 .error_strings = lb_error_strings,
1238 .n_next_nodes = LB6_NODEPORT_N_NEXT,
1241 [LB6_NODEPORT_NEXT_IP6_NAT6] = "lb6-nat6-port",
1242 [LB6_NODEPORT_NEXT_DROP] = "error-drop",
1246 VNET_FEATURE_INIT (lb_nat4_in2out_node_fn, static) =
1248 .arc_name = "ip4-unicast",
1249 .node_name = "lb-nat4-in2out",
1250 .runs_before = VNET_FEATURES("ip4-lookup"),
1253 VLIB_REGISTER_NODE (lb_nat4_in2out_node) =
1255 .function = lb_nat4_in2out_node_fn,
1256 .name = "lb-nat4-in2out",
1257 .vector_size = sizeof(u32),
1258 .format_trace = format_lb_nat_trace,
1259 .n_errors = LB_N_ERROR,
1260 .error_strings = lb_error_strings,
1261 .n_next_nodes = LB_NAT4_IN2OUT_N_NEXT,
1264 [LB_NAT4_IN2OUT_NEXT_DROP] = "error-drop",
1265 [LB_NAT4_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1269 VNET_FEATURE_INIT (lb_nat6_in2out_node_fn, static) =
1271 .arc_name = "ip6-unicast",
1272 .node_name = "lb-nat6-in2out",
1273 .runs_before = VNET_FEATURES("ip6-lookup"),
1276 VLIB_REGISTER_NODE (lb_nat6_in2out_node) =
1278 .function = lb_nat6_in2out_node_fn,
1279 .name = "lb-nat6-in2out",
1280 .vector_size = sizeof(u32),
1281 .format_trace = format_lb_nat_trace,
1282 .n_errors = LB_N_ERROR,
1283 .error_strings = lb_error_strings,
1284 .n_next_nodes = LB_NAT6_IN2OUT_N_NEXT,
1287 [LB_NAT6_IN2OUT_NEXT_DROP] = "error-drop",
1288 [LB_NAT6_IN2OUT_NEXT_LOOKUP] = "ip6-lookup",