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.
18 #include <vnet/gre/packet.h>
19 #include <lb/lbhash.h>
21 #define foreach_lb_error \
23 _(PROTO_NOT_SUPPORTED, "protocol not supported") \
24 _(NO_SERVER, "no configured application server")
27 #define _(sym,str) LB_ERROR_##sym,
33 static char *lb_error_strings[] = {
34 #define _(sym,string) string,
51 /* u8 *lb_format_adjacency(u8 * s, va_list * va) */
53 /* lb_main_t *lbm = &lb_main; */
54 /* __attribute((unused)) ip_lookup_main_t *lm = va_arg (*va, ip_lookup_main_t *); */
55 /* ip_adjacency_t *adj = va_arg (*va, ip_adjacency_t *); */
56 /* lb_adj_data_t *ad = (lb_adj_data_t *) &adj->opaque; */
57 /* __attribute__((unused)) lb_vip_t *vip = pool_elt_at_index (lbm->vips, ad->vip_index); */
58 /* return format(s, "vip idx:%d", ad->vip_index); */
62 format_lb_trace (u8 * s, va_list * args)
64 lb_main_t *lbm = &lb_main;
65 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
66 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
67 lb_trace_t *t = va_arg (*args, lb_trace_t *);
68 s = format(s, "lb vip[%d]: %U\n", t->vip_index, format_lb_vip, &lbm->vips[t->vip_index]);
69 s = format(s, "lb as[%d]: %U\n", t->as_index, format_lb_as, &lbm->ass[t->as_index]);
73 lb_hash_t *lb_get_sticky_table(u32 cpu_index)
75 lb_main_t *lbm = &lb_main;
76 lb_hash_t *sticky_ht = lbm->per_cpu[cpu_index].sticky_ht;
77 //Check if size changed
78 if (PREDICT_FALSE(sticky_ht && (lbm->per_cpu_sticky_buckets != lb_hash_nbuckets(sticky_ht)))) {
80 //Dereference everything in there
82 lb_hash_foreach_entry(sticky_ht, e) {
83 vlib_refcount_add(&lbm->as_refcount, cpu_index, e->value, -1);
84 vlib_refcount_add(&lbm->as_refcount, cpu_index, 0, -1);
87 lb_hash_free(sticky_ht);
92 if (PREDICT_FALSE(sticky_ht == NULL)) {
93 lbm->per_cpu[cpu_index].sticky_ht = lb_hash_alloc(lbm->per_cpu_sticky_buckets, lbm->flow_timeout);
94 sticky_ht = lbm->per_cpu[cpu_index].sticky_ht;
95 clib_warning("Regenerated sticky table %p", sticky_ht);
101 sticky_ht->timeout = lbm->flow_timeout;
105 static_always_inline uword
106 lb_node_fn (vlib_main_t * vm,
107 vlib_node_runtime_t * node, vlib_frame_t * frame,
108 u8 is_input_v4, //Compile-time parameter stating that is input is v4 (or v6)
109 u8 is_encap_v4) //Compile-time parameter stating that is GRE encap is v4 (or v6)
111 /* ip_lookup_main_t *lm = (is_input_v4)?&ip4_main.lookup_main:&ip6_main.lookup_main; */
112 /* lb_main_t *lbm = &lb_main; */
113 /* vlib_node_runtime_t *error_node = node; */
114 /* u32 n_left_from, *from, next_index, *to_next, n_left_to_next; */
115 /* u32 cpu_index = os_get_cpu_number(); */
116 /* u32 lb_time = lb_hash_time_now(vm); */
118 /* lb_hash_t *sticky_ht = lb_get_sticky_table(cpu_index); */
119 /* from = vlib_frame_vector_args (frame); */
120 /* n_left_from = frame->n_vectors; */
121 /* next_index = node->cached_next_index; */
123 /* while (n_left_from > 0) */
125 /* vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); */
126 /* while (n_left_from > 0 && n_left_to_next > 0) */
129 /* vlib_buffer_t *p0; */
130 /* ip_adjacency_t *adj0; */
131 /* lb_adj_data_t *ad0; */
132 /* lb_vip_t *vip0; */
134 /* gre_header_t *gre0; */
136 /* u32 value0, available_index0, hash0; */
138 /* lb_error_t error0 = LB_ERROR_NONE; */
139 /* lb_next_t next0 = LB_NEXT_LOOKUP; */
141 /* if (PREDICT_TRUE(n_left_from > 1)) */
143 /* vlib_buffer_t *p2; */
144 /* p2 = vlib_get_buffer(vm, from[1]); */
145 /* vlib_prefetch_buffer_header(p2, STORE); */
146 /* /\* IPv4 + 8 = 28. possibly plus -40 *\/ */
147 /* CLIB_PREFETCH (vlib_buffer_get_current(p2) - 40, 128, STORE); */
150 /* pi0 = to_next[0] = from[0]; */
152 /* n_left_from -= 1; */
154 /* n_left_to_next -= 1; */
156 /* p0 = vlib_get_buffer (vm, pi0); */
157 /* adj0 = ip_get_adjacency (lm, vnet_buffer (p0)->ip.adj_index[VLIB_TX]); */
158 /* ad0 = (lb_adj_data_t *) &adj0->opaque; */
159 /* vip0 = pool_elt_at_index (lbm->vips, ad0->vip_index); */
161 /* if (is_input_v4) { */
162 /* ip4_header_t *ip40; */
163 /* ip40 = vlib_buffer_get_current (p0); */
164 /* len0 = clib_net_to_host_u16(ip40->length); */
165 /* key0[0] = (u64) ip40->src_address.as_u32; */
166 /* key0[1] = (u64) ip40->dst_address.as_u32; */
169 /* key0[4] = ((u64)((udp_header_t *)(ip40 + 1))->src_port << 32) | */
170 /* ((u64)((udp_header_t *)(ip40 + 1))->dst_port << 16); */
172 /* hash0 = lb_hash_hash(key0); */
174 /* ip6_header_t *ip60; */
175 /* ip60 = vlib_buffer_get_current (p0); */
176 /* len0 = clib_net_to_host_u16(ip60->payload_length) + sizeof(ip6_header_t); */
177 /* key0[0] = ip60->src_address.as_u64[0]; */
178 /* key0[1] = ip60->src_address.as_u64[1]; */
179 /* key0[2] = ip60->dst_address.as_u64[0]; */
180 /* key0[3] = ip60->dst_address.as_u64[1]; */
181 /* key0[4] = ((u64)((udp_header_t *)(ip60 + 1))->src_port << 32) | */
182 /* ((u64)((udp_header_t *)(ip60 + 1))->dst_port << 16); */
184 /* hash0 = lb_hash_hash(key0); */
187 /* //NOTE: This is an ugly trick to not include the VIP index in the hash calculation */
188 /* //but actually use it in the key determination. */
189 /* key0[4] |= ((vip0 - lbm->vips)); */
191 /* lb_hash_get(sticky_ht, key0, hash0, lb_time, &available_index0, &value0); */
192 /* if (PREDICT_TRUE(value0 != ~0)) { */
193 /* //Found an existing entry */
194 /* as0 = &lbm->ass[value0]; */
195 /* } else if (PREDICT_TRUE(available_index0 != ~0)) { */
196 /* //There is an available slot for a new flow */
197 /* as0 = &lbm->ass[vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].as_index]; */
198 /* if (PREDICT_FALSE(as0 == lbm->ass)) { //Special first element */
199 /* error0 = LB_ERROR_NO_SERVER; */
200 /* next0 = LB_NEXT_DROP; */
202 /* vlib_increment_simple_counter(&lbm->vip_counters[LB_VIP_COUNTER_TRACKED_SESSION], */
203 /* cpu_index, vip0 - lbm->vips, 1); */
206 /* //TODO: There are race conditions with as0 and vip0 manipulation. */
207 /* //Configuration may be changed, vectors resized, etc... */
209 /* //Dereference previously used */
210 /* vlib_refcount_add(&lbm->as_refcount, cpu_index, lb_hash_available_value(sticky_ht, available_index0), -1); */
211 /* vlib_refcount_add(&lbm->as_refcount, cpu_index, as0 - lbm->ass, 1); */
213 /* //Add sticky entry */
214 /* //Note that when there is no AS configured, an entry is configured anyway. */
215 /* //But no configured AS is not something that should happen */
216 /* lb_hash_put(sticky_ht, key0, as0 - lbm->ass, available_index0, lb_time); */
218 /* //Could not store new entry in the table */
219 /* as0 = &lbm->ass[vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].as_index]; */
220 /* vlib_increment_simple_counter(&lbm->vip_counters[LB_VIP_COUNTER_UNTRACKED_PACKET], */
221 /* cpu_index, vip0 - lbm->vips, 1); */
224 /* //Now let's encap */
225 /* if (is_encap_v4) { */
226 /* ip4_header_t *ip40; */
227 /* vlib_buffer_advance(p0, - sizeof(ip4_header_t) - sizeof(gre_header_t)); */
228 /* ip40 = vlib_buffer_get_current(p0); */
229 /* gre0 = (gre_header_t *)(ip40 + 1); */
230 /* ip40->src_address = lbm->ip4_src_address; */
231 /* ip40->dst_address = as0->address.ip4; */
232 /* ip40->ip_version_and_header_length = 0x45; */
233 /* ip40->ttl = 128; */
234 /* ip40->length = clib_host_to_net_u16(len0 + sizeof(gre_header_t) + sizeof(ip4_header_t)); */
235 /* ip40->protocol = IP_PROTOCOL_GRE; */
236 /* ip40->checksum = ip4_header_checksum (ip40); */
238 /* ip6_header_t *ip60; */
239 /* vlib_buffer_advance(p0, - sizeof(ip6_header_t) - sizeof(gre_header_t)); */
240 /* ip60 = vlib_buffer_get_current(p0); */
241 /* gre0 = (gre_header_t *)(ip60 + 1); */
242 /* ip60->dst_address = as0->address.ip6; */
243 /* ip60->src_address = lbm->ip6_src_address; */
244 /* ip60->hop_limit = 128; */
245 /* ip60->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6<<28); */
246 /* ip60->payload_length = clib_host_to_net_u16(len0 + sizeof(gre_header_t)); */
247 /* ip60->protocol = IP_PROTOCOL_GRE; */
250 /* gre0->flags_and_version = 0; */
251 /* gre0->protocol = (is_input_v4)? */
252 /* clib_host_to_net_u16(0x0800): */
253 /* clib_host_to_net_u16(0x86DD); */
255 /* vnet_buffer(p0)->ip.adj_index[VLIB_TX] = as0->adj_index; */
256 /* next0 = (as0->adj_index != ~0)?LB_NEXT_REWRITE:next0; */
258 /* if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED)) */
260 /* lb_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr)); */
261 /* tr->as_index = as0 - lbm->ass; */
262 /* tr->vip_index = ad0->vip_index; */
265 /* p0->error = error_node->errors[error0]; */
266 /* vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, */
267 /* n_left_to_next, pi0, next0); */
269 /* vlib_put_next_frame (vm, node, next_index, n_left_to_next); */
272 /* return frame->n_vectors; */
277 lb6_gre6_node_fn (vlib_main_t * vm,
278 vlib_node_runtime_t * node, vlib_frame_t * frame)
280 return lb_node_fn(vm, node, frame, 0, 0);
284 lb6_gre4_node_fn (vlib_main_t * vm,
285 vlib_node_runtime_t * node, vlib_frame_t * frame)
287 return lb_node_fn(vm, node, frame, 0, 1);
291 lb4_gre6_node_fn (vlib_main_t * vm,
292 vlib_node_runtime_t * node, vlib_frame_t * frame)
294 return lb_node_fn(vm, node, frame, 1, 0);
298 lb4_gre4_node_fn (vlib_main_t * vm,
299 vlib_node_runtime_t * node, vlib_frame_t * frame)
301 return lb_node_fn(vm, node, frame, 1, 1);
304 VLIB_REGISTER_NODE (lb6_gre6_node) =
306 .function = lb6_gre6_node_fn,
308 .vector_size = sizeof (u32),
309 .format_trace = format_lb_trace,
311 .n_errors = LB_N_ERROR,
312 .error_strings = lb_error_strings,
314 .n_next_nodes = LB_N_NEXT,
317 [LB_NEXT_LOOKUP] = "ip6-lookup",
318 [LB_NEXT_REWRITE] = "ip6-rewrite",
319 [LB_NEXT_DROP] = "error-drop"
323 /* VNET_IP6_REGISTER_ADJACENCY(lb6_gre6) = { */
324 /* .node_name = "lb6-gre6", */
325 /* .fn = lb_format_adjacency, */
326 /* .next_index = &lb_main.ip_lookup_next_index[LB_VIP_TYPE_IP6_GRE6] */
329 VLIB_REGISTER_NODE (lb6_gre4_node) =
331 .function = lb6_gre4_node_fn,
333 .vector_size = sizeof (u32),
334 .format_trace = format_lb_trace,
336 .n_errors = LB_N_ERROR,
337 .error_strings = lb_error_strings,
339 .n_next_nodes = LB_N_NEXT,
342 [LB_NEXT_LOOKUP] = "ip4-lookup",
343 [LB_NEXT_REWRITE]= "ip4-rewrite-transit",
344 [LB_NEXT_DROP] = "error-drop"
348 /* VNET_IP6_REGISTER_ADJACENCY(lb6_gre4) = { */
349 /* .node_name = "lb6-gre4", */
350 /* .fn = lb_format_adjacency, */
351 /* .next_index = &lb_main.ip_lookup_next_index[LB_VIP_TYPE_IP6_GRE4] */
354 VLIB_REGISTER_NODE (lb4_gre6_node) =
356 .function = lb4_gre6_node_fn,
358 .vector_size = sizeof (u32),
359 .format_trace = format_lb_trace,
361 .n_errors = LB_N_ERROR,
362 .error_strings = lb_error_strings,
364 .n_next_nodes = LB_N_NEXT,
367 [LB_NEXT_LOOKUP] = "ip6-lookup",
368 [LB_NEXT_REWRITE] = "ip6-rewrite",
369 [LB_NEXT_DROP] = "error-drop"
373 /* VNET_IP4_REGISTER_ADJACENCY(lb4_gre6) = { */
374 /* .node_name = "lb4-gre6", */
375 /* .fn = lb_format_adjacency, */
376 /* .next_index = &lb_main.ip_lookup_next_index[LB_VIP_TYPE_IP4_GRE6] */
379 VLIB_REGISTER_NODE (lb4_gre4_node) =
381 .function = lb4_gre4_node_fn,
383 .vector_size = sizeof (u32),
384 .format_trace = format_lb_trace,
386 .n_errors = LB_N_ERROR,
387 .error_strings = lb_error_strings,
389 .n_next_nodes = LB_N_NEXT,
392 [LB_NEXT_LOOKUP] = "ip4-lookup",
393 [LB_NEXT_REWRITE]= "ip4-rewrite-transit",
394 [LB_NEXT_DROP] = "error-drop"
398 /* VNET_IP4_REGISTER_ADJACENCY(lb4_gre4) = { */
399 /* .node_name = "lb4-gre4", */
400 /* .fn = lb_format_adjacency, */
401 /* .next_index = &lb_main.ip_lookup_next_index[LB_VIP_TYPE_IP4_GRE4] */