2 * Copyright (c) 2020 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 <vlibmemory/api.h>
17 #include <cnat/cnat_node.h>
18 #include <cnat/cnat_translation.h>
19 #include <cnat/cnat_inline.h>
20 #include <cnat/cnat_src_policy.h>
22 #include <vnet/dpo/load_balance.h>
23 #include <vnet/dpo/load_balance_map.h>
25 typedef struct cnat_translation_trace_t_
27 cnat_session_t session;
28 cnat_translation_t tr;
32 } cnat_translation_trace_t;
34 typedef enum cnat_translation_next_t_
36 CNAT_TRANSLATION_NEXT_DROP,
37 CNAT_TRANSLATION_NEXT_LOOKUP,
38 CNAT_TRANSLATION_N_NEXT,
39 } cnat_translation_next_t;
41 vlib_node_registration_t cnat_vip_ip4_node;
42 vlib_node_registration_t cnat_vip_ip6_node;
45 format_cnat_translation_trace (u8 * s, va_list * args)
47 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
48 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
49 cnat_translation_trace_t *t = va_arg (*args, cnat_translation_trace_t *);
52 s = format (s, "found: %U", format_cnat_session, &t->session, 1);
53 else if (t->created_session)
54 s = format (s, "created: %U\n tr: %U",
55 format_cnat_session, &t->session, 1,
56 format_cnat_translation, &t->tr, 0);
58 s = format (s, "tr pass: %U", format_cnat_translation, &t->tr, 0);
60 s = format (s, "not found");
64 /* CNat sub for NAT behind a fib entry (VIP or interposed real IP) */
66 cnat_vip_inline (vlib_main_t * vm,
67 vlib_node_runtime_t * node,
69 cnat_node_ctx_t * ctx, int rv, cnat_session_t * session)
71 vlib_combined_counter_main_t *cntm = &cnat_translation_counters;
72 const cnat_translation_t *ct = NULL;
73 ip4_header_t *ip4 = NULL;
75 ip6_header_t *ip6 = NULL;
80 int created_session = 0;
81 cnat_src_policy_main_t *cspm = &cnat_src_policy_main;
82 if (AF_IP4 == ctx->af)
84 ip4 = vlib_buffer_get_current (b);
85 iproto = ip4->protocol;
86 udp0 = (udp_header_t *) (ip4 + 1);
90 ip6 = vlib_buffer_get_current (b);
91 iproto = ip6->protocol;
92 udp0 = (udp_header_t *) (ip6 + 1);
95 cc = cnat_client_get (vnet_buffer (b)->ip.adj_index[VLIB_TX]);
97 if (iproto != IP_PROTOCOL_UDP && iproto != IP_PROTOCOL_TCP
98 && iproto != IP_PROTOCOL_ICMP && iproto != IP_PROTOCOL_ICMP6)
100 /* Dont translate & follow the fib programming */
101 next0 = cc->cc_parent.dpoi_next_node;
102 vnet_buffer (b)->ip.adj_index[VLIB_TX] = cc->cc_parent.dpoi_index;
106 ct = cnat_find_translation (cc->parent_cci,
107 clib_host_to_net_u16 (udp0->dst_port), iproto);
111 /* session table hit */
112 cnat_timestamp_update (session->value.cs_ts_index, ctx->now);
116 /* Translate & follow the translation given LB */
117 next0 = ct->ct_lb.dpoi_next_node;
118 vnet_buffer (b)->ip.adj_index[VLIB_TX] = session->value.cs_lbi;
120 else if (session->value.flags & CNAT_SESSION_FLAG_HAS_SNAT)
122 /* The return needs DNAT, so we need an additionnal
123 * lookup after translation */
124 next0 = CNAT_TRANSLATION_NEXT_LOOKUP;
128 /* Translate & follow the fib programming */
129 next0 = cc->cc_parent.dpoi_next_node;
130 vnet_buffer (b)->ip.adj_index[VLIB_TX] = cc->cc_parent.dpoi_index;
137 /* Dont translate & Follow the fib programming */
138 vnet_buffer (b)->ip.adj_index[VLIB_TX] = cc->cc_parent.dpoi_index;
139 next0 = cc->cc_parent.dpoi_next_node;
143 /* New flow, create the sessions */
144 const load_balance_t *lb0;
146 u32 hash_c0, bucket0;
147 u32 rsession_flags = 0;
148 const dpo_id_t *dpo0;
150 lb0 = load_balance_get (ct->ct_lb.dpoi_index);
151 if (!lb0->lb_n_buckets)
153 /* Dont translate & Follow the fib programming */
154 vnet_buffer (b)->ip.adj_index[VLIB_TX] = cc->cc_parent.dpoi_index;
155 next0 = cc->cc_parent.dpoi_next_node;
159 /* session table miss */
160 hash_c0 = (AF_IP4 == ctx->af ?
161 ip4_compute_flow_hash (ip4, lb0->lb_hash_config) :
162 ip6_compute_flow_hash (ip6, lb0->lb_hash_config));
163 bucket0 = hash_c0 % lb0->lb_n_buckets;
164 dpo0 = load_balance_get_fwd_bucket (lb0, bucket0);
166 /* add the session */
167 trk0 = &ct->ct_paths[bucket0];
169 ip46_address_copy (&session->value.cs_ip[VLIB_TX],
170 &trk0->ct_ep[VLIB_TX].ce_ip.ip);
171 if (ip_address_is_zero (&trk0->ct_ep[VLIB_RX].ce_ip))
173 if (AF_IP4 == ctx->af)
174 ip46_address_set_ip4 (&session->value.cs_ip[VLIB_RX],
177 ip46_address_set_ip6 (&session->value.cs_ip[VLIB_RX],
182 /* We source NAT with the translation */
183 rsession_flags |= CNAT_SESSION_FLAG_HAS_SNAT;
184 ip46_address_copy (&session->value.cs_ip[VLIB_RX],
185 &trk0->ct_ep[VLIB_RX].ce_ip.ip);
187 session->value.cs_port[VLIB_TX] =
188 clib_host_to_net_u16 (trk0->ct_ep[VLIB_TX].ce_port);
189 session->value.cs_port[VLIB_RX] =
190 clib_host_to_net_u16 (trk0->ct_ep[VLIB_RX].ce_port);
192 session->value.flags = 0;
193 session->value.cs_lbi = dpo0->dpoi_index;
195 rv = cspm->vip_policy (vm, b, session, &rsession_flags, ct, ctx);
196 if (CNAT_SOURCE_ERROR_USE_DEFAULT == rv)
197 rv = cspm->default_policy (vm, b, session, &rsession_flags, ct, ctx);
200 if (CNAT_SOURCE_ERROR_EXHAUSTED_PORTS == rv)
201 vlib_node_increment_counter (vm, cnat_vip_ip4_node.index,
202 CNAT_ERROR_EXHAUSTED_PORTS, 1);
203 next0 = CNAT_TRANSLATION_NEXT_DROP;
207 /* refcnt session in current client */
208 cnat_client_cnt_session (cc);
209 cnat_session_create (session, ctx, rsession_flags);
212 next0 = ct->ct_lb.dpoi_next_node;
213 vnet_buffer (b)->ip.adj_index[VLIB_TX] = session->value.cs_lbi;
216 if (AF_IP4 == ctx->af)
217 cnat_translation_ip4 (session, ip4, udp0);
219 cnat_translation_ip6 (session, ip6, udp0);
223 cti = ct - cnat_translation_pool;
224 vlib_increment_combined_counter (cntm, ctx->thread_index, cti, 1,
225 vlib_buffer_length_in_chain (vm, b));
229 if (PREDICT_FALSE (ctx->do_trace))
231 cnat_translation_trace_t *t;
233 t = vlib_add_trace (vm, node, b, sizeof (*t));
235 t->found_session = !rv;
236 t->created_session = created_session;
237 if (t->found_session || t->created_session)
238 clib_memcpy (&t->session, session, sizeof (t->session));
239 t->has_tr = (NULL != ct);
241 clib_memcpy (&t->tr, ct, sizeof (cnat_translation_t));
246 VLIB_NODE_FN (cnat_vip_ip4_node) (vlib_main_t * vm,
247 vlib_node_runtime_t * node,
248 vlib_frame_t * frame)
250 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
251 return cnat_node_inline (vm, node, frame, cnat_vip_inline, AF_IP4,
253 return cnat_node_inline (vm, node, frame, cnat_vip_inline, AF_IP4,
257 VLIB_NODE_FN (cnat_vip_ip6_node) (vlib_main_t * vm,
258 vlib_node_runtime_t * node,
259 vlib_frame_t * frame)
261 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
262 return cnat_node_inline (vm, node, frame, cnat_vip_inline, AF_IP6,
264 return cnat_node_inline (vm, node, frame, cnat_vip_inline, AF_IP6,
269 VLIB_REGISTER_NODE (cnat_vip_ip4_node) =
271 .name = "ip4-cnat-tx",
272 .vector_size = sizeof (u32),
273 .format_trace = format_cnat_translation_trace,
274 .type = VLIB_NODE_TYPE_INTERNAL,
276 .n_next_nodes = CNAT_TRANSLATION_N_NEXT,
279 [CNAT_TRANSLATION_NEXT_DROP] = "ip4-drop",
280 [CNAT_TRANSLATION_NEXT_LOOKUP] = "ip4-lookup",
283 VLIB_REGISTER_NODE (cnat_vip_ip6_node) =
285 .name = "ip6-cnat-tx",
286 .vector_size = sizeof (u32),
287 .format_trace = format_cnat_translation_trace,
288 .type = VLIB_NODE_TYPE_INTERNAL,
290 .n_next_nodes = CNAT_TRANSLATION_N_NEXT,
293 [CNAT_TRANSLATION_NEXT_DROP] = "ip6-drop",
294 [CNAT_TRANSLATION_NEXT_LOOKUP] = "ip6-lookup",
300 * fd.io coding-style-patch-verification: ON
303 * eval: (c-set-style "gnu")