2 * ct6_in2out.c - ip6 connection tracker, inside-to-outside path
4 * Copyright (c) 2019 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.
17 #include <vlib/vlib.h>
18 #include <vnet/vnet.h>
19 #include <vnet/pg/pg.h>
20 #include <vppinfra/error.h>
30 #ifndef CLIB_MARCH_VARIANT
32 /* packet trace format function */
34 format_ct6_in2out_trace (u8 * s, va_list * args)
36 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
37 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
38 ct6_in2out_trace_t *t = va_arg (*args, ct6_in2out_trace_t *);
40 s = format (s, "CT6_IN2OUT: sw_if_index %d, next index %d session %d\n",
41 t->sw_if_index, t->next_index, t->session_index);
45 vlib_node_registration_t ct6_in2out_node;
47 #endif /* CLIB_MARCH_VARIANT */
49 #define foreach_ct6_in2out_error \
50 _(PROCESSED, "ct6 packets processed") \
51 _(CREATED, "ct6 sessions created") \
52 _(RECYCLED, "ct6 sessions recycled")
56 #define _(sym,str) CT6_IN2OUT_ERROR_##sym,
57 foreach_ct6_in2out_error
62 #ifndef CLIB_MARCH_VARIANT
63 static char *ct6_in2out_error_strings[] = {
64 #define _(sym,string) string,
65 foreach_ct6_in2out_error
68 #endif /* CLIB_MARCH_VARIANT */
76 #ifndef CLIB_MARCH_VARIANT
78 ct6_create_or_recycle_session (ct6_main_t * cmp,
79 clib_bihash_kv_48_8_t * kvpp, f64 now,
80 u32 my_thread_index, u32 * recyclep,
86 if (PREDICT_FALSE (cmp->last_index[my_thread_index] == ~0))
89 /* Look at the least-recently-used session */
90 s0 = pool_elt_at_index (cmp->sessions[my_thread_index],
91 cmp->last_index[my_thread_index]);
93 if (s0->expires < now)
94 clib_warning ("session %d expired %.2f time now %.2f",
95 s0 - cmp->sessions[my_thread_index], s0->expires, now);
97 if (pool_elts (cmp->sessions[my_thread_index]) >=
98 cmp->max_sessions_per_worker)
99 clib_warning ("recycle session %d have %d max %d",
100 s0 - cmp->sessions[my_thread_index],
101 pool_elts (cmp->sessions[my_thread_index]),
102 cmp->max_sessions_per_worker);
104 /* Session expired, or we have as many sessions as is allowed by law? */
105 if ((s0->expires < now) || (pool_elts (cmp->sessions[my_thread_index])
106 >= cmp->max_sessions_per_worker))
108 /* recycle the session */
109 if (clib_bihash_add_del_48_8 (&cmp->session_hash,
110 (clib_bihash_kv_48_8_t *) s0,
111 0 /* is_add */ ) < 0)
112 clib_warning ("session %d not found in hash?",
113 s0 - cmp->sessions[my_thread_index]);
115 ct6_lru_remove (cmp, s0);
121 /* Allocate a fresh session */
122 pool_get (cmp->sessions[my_thread_index], s0);
127 memset (s0, 0, sizeof (*s0));
128 clib_memcpy_fast (s0, kvpp, sizeof (ct6_session_key_t));
129 s0->thread_index = my_thread_index;
130 s0->expires = now + cmp->session_timeout_interval;
131 kvpp->value = s0 - cmp->sessions[my_thread_index];
132 clib_bihash_add_del_48_8 (&cmp->session_hash, kvpp, 1 /* is_add */ );
133 ct6_lru_add (cmp, s0, now);
136 #endif /* CLIB_MARCH_VARIANT */
139 ct6_in2out_inline (vlib_main_t * vm,
140 vlib_node_runtime_t * node, vlib_frame_t * frame,
143 u32 n_left_from, *from;
144 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
145 u16 nexts[VLIB_FRAME_SIZE], *next;
146 ct6_main_t *cmp = &ct6_main;
147 u32 my_thread_index = vm->thread_index;
148 f64 now = vlib_time_now (vm);
152 from = vlib_frame_vector_args (frame);
153 n_left_from = frame->n_vectors;
155 vlib_get_buffers (vm, from, bufs, n_left_from);
160 while (n_left_from >= 4)
162 /* Prefetch next iteration. */
163 if (PREDICT_TRUE (n_left_from >= 8))
165 vlib_prefetch_buffer_header (b[4], STORE);
166 vlib_prefetch_buffer_header (b[5], STORE);
167 vlib_prefetch_buffer_header (b[6], STORE);
168 vlib_prefetch_buffer_header (b[7], STORE);
169 CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, STORE);
170 CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, STORE);
171 CLIB_PREFETCH (b[6]->data, CLIB_CACHE_LINE_BYTES, STORE);
172 CLIB_PREFETCH (b[7]->data, CLIB_CACHE_LINE_BYTES, STORE);
175 /* $$$$ process 4x pkts right here */
183 if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
185 ct6_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t));
186 t->next_index = next[0];
187 t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
189 if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
191 ct6_trace_t *t = vlib_add_trace (vm, node, b[1], sizeof (*t));
192 t->next_index = next[1];
193 t->sw_if_index = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
195 if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
197 ct6_trace_t *t = vlib_add_trace (vm, node, b[2], sizeof (*t));
198 t->next_index = next[2];
199 t->sw_if_index = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
201 if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
203 ct6_trace_t *t = vlib_add_trace (vm, node, b[3], sizeof (*t));
204 t->next_index = next[3];
205 t->sw_if_index = vnet_buffer (b[3])->sw_if_index[VLIB_RX];
215 while (n_left_from > 0)
217 clib_bihash_kv_48_8_t kvp0;
218 ct6_session_key_t *key0;
220 u32 session_index0 = ~0;
222 ethernet_header_t *e0;
227 /* $$$ Set to 0 for pg testing */
230 vnet_feature_next (&next0, b[0]);
234 next[0] = CT6_IN2OUT_NEXT_DROP;
237 * This is an output feature which runs at the last possible
238 * moment. Assume an ethernet header.
241 e0 = vlib_buffer_get_current (b[0]);
242 delta0 = sizeof (*e0);
243 delta0 += (e0->type == clib_net_to_host_u16 (ETHERNET_TYPE_VLAN))
245 delta0 += (e0->type == clib_net_to_host_u16 (ETHERNET_TYPE_DOT1AD))
248 ip0 = (ip6_header_t *) (vlib_buffer_get_current (b[0]) + delta0);
251 * Pass non-global unicast traffic
253 if (PREDICT_FALSE (!ip6_address_is_global_unicast (&ip0->src_address)
255 !ip6_address_is_global_unicast (&ip0->src_address)))
257 /* Pass non-udp, non-tcp traffic */
258 if (PREDICT_FALSE (ip0->protocol != IP_PROTOCOL_TCP &&
259 ip0->protocol != IP_PROTOCOL_UDP))
262 udp0 = ip6_next_header (ip0);
265 * See if we know about this flow.
266 * Key set up for the out2in path, the performant case
268 key0 = (ct6_session_key_t *) & kvp0;
269 clib_memcpy_fast (&key0->src, &ip0->dst_address,
270 sizeof (ip6_address_t));
271 clib_memcpy_fast (&key0->dst, &ip0->src_address,
272 sizeof (ip6_address_t));
275 key0->sport = udp0->dst_port;
276 key0->dport = udp0->src_port;
277 key0->proto = ip0->protocol;
279 /* Need to create a new session? */
280 if (clib_bihash_search_48_8 (&cmp->session_hash, &kvp0, &kvp0) < 0)
283 ct6_create_or_recycle_session (cmp, &kvp0, now, my_thread_index,
284 &recycled, &created);
285 session_index0 = kvp0.value;
289 s0 = pool_elt_at_index (cmp->sessions[my_thread_index], kvp0.value);
290 session_index0 = kvp0.value;
291 ct6_update_session_hit (cmp, s0, now);
297 if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
299 ct6_in2out_trace_t *t =
300 vlib_add_trace (vm, node, b[0], sizeof (*t));
301 t->next_index = next[0];
302 t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
303 t->session_index = session_index0;
312 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
314 vlib_node_increment_counter (vm, node->node_index,
315 CT6_IN2OUT_ERROR_PROCESSED, frame->n_vectors);
316 vlib_node_increment_counter (vm, node->node_index,
317 CT6_IN2OUT_ERROR_CREATED, created);
318 vlib_node_increment_counter (vm, node->node_index,
319 CT6_IN2OUT_ERROR_RECYCLED, recycled);
321 return frame->n_vectors;
324 VLIB_NODE_FN (ct6_in2out_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
325 vlib_frame_t * frame)
327 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
328 return ct6_in2out_inline (vm, node, frame, 1 /* is_trace */ );
330 return ct6_in2out_inline (vm, node, frame, 0 /* is_trace */ );
334 #ifndef CLIB_MARCH_VARIANT
335 VLIB_REGISTER_NODE (ct6_in2out_node) =
337 .name = "ct6-in2out",
338 .vector_size = sizeof (u32),
339 .format_trace = format_ct6_in2out_trace,
340 .type = VLIB_NODE_TYPE_INTERNAL,
342 .n_errors = ARRAY_LEN(ct6_in2out_error_strings),
343 .error_strings = ct6_in2out_error_strings,
345 .n_next_nodes = CT6_IN2OUT_N_NEXT,
347 /* edit / add dispositions here */
349 [CT6_IN2OUT_NEXT_DROP] = "error-drop",
351 .unformat_buffer = unformat_ethernet_header,
353 #endif /* CLIB_MARCH_VARIANT */
357 * fd.io coding-style-patch-verification: ON
360 * eval: (c-set-style "gnu")