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.
15 #include <vppinfra/error.h>
16 #include <vppinfra/hash.h>
17 #include <vnet/vnet.h>
18 #include <vnet/ip/ip.h>
19 #include <vnet/ethernet/ethernet.h>
20 #include <vnet/nsh-gre/nsh_gre.h>
22 /* Statistics (not really errors) */
23 #define foreach_nsh_gre_encap_error \
24 _(ENCAPSULATED, "good packets encapsulated")
26 static char * nsh_gre_encap_error_strings[] = {
27 #define _(sym,string) string,
28 foreach_nsh_gre_encap_error
33 #define _(sym,str) NSH_GRE_ENCAP_ERROR_##sym,
34 foreach_nsh_gre_encap_error
36 NSH_GRE_ENCAP_N_ERROR,
37 } nsh_gre_encap_error_t;
40 NSH_GRE_ENCAP_NEXT_IP4_LOOKUP,
41 NSH_GRE_ENCAP_NEXT_DROP,
43 } nsh_gre_encap_next_t;
47 } nsh_gre_encap_trace_t;
49 u8 * format_nsh_gre_encap_trace (u8 * s, va_list * args)
51 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
52 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
53 nsh_gre_encap_trace_t * t = va_arg (*args, nsh_gre_encap_trace_t *);
55 s = format (s, "NSH-GRE-ENCAP: tunnel %d", t->tunnel_index);
60 nsh_gre_encap (vlib_main_t * vm,
61 vlib_node_runtime_t * node,
62 vlib_frame_t * from_frame)
64 u32 n_left_from, next_index, * from, * to_next;
65 nsh_gre_main_t * ngm = &nsh_gre_main;
66 vnet_main_t * vnm = ngm->vnet_main;
67 u32 pkts_encapsulated = 0;
68 u16 old_l0 = 0, old_l1 = 0;
70 from = vlib_frame_vector_args (from_frame);
71 n_left_from = from_frame->n_vectors;
73 next_index = node->cached_next_index;
75 while (n_left_from > 0)
79 vlib_get_next_frame (vm, node, next_index,
80 to_next, n_left_to_next);
82 while (n_left_from >= 4 && n_left_to_next >= 2)
85 vlib_buffer_t * b0, * b1;
86 u32 next0 = NSH_GRE_ENCAP_NEXT_IP4_LOOKUP;
87 u32 next1 = NSH_GRE_ENCAP_NEXT_IP4_LOOKUP;
88 vnet_hw_interface_t * hi0, * hi1;
89 ip4_header_t * ip0, * ip1;
90 u64 * copy_src0, * copy_dst0;
91 u64 * copy_src1, * copy_dst1;
92 nsh_gre_tunnel_t * t0, * t1;
96 /* Prefetch next iteration. */
98 vlib_buffer_t * p2, * p3;
100 p2 = vlib_get_buffer (vm, from[2]);
101 p3 = vlib_get_buffer (vm, from[3]);
103 vlib_prefetch_buffer_header (p2, LOAD);
104 vlib_prefetch_buffer_header (p3, LOAD);
106 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
107 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
119 b0 = vlib_get_buffer (vm, bi0);
120 b1 = vlib_get_buffer (vm, bi1);
122 hi0 = vnet_get_sup_hw_interface
123 (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);
124 hi1 = vnet_get_sup_hw_interface
125 (vnm, vnet_buffer(b1)->sw_if_index[VLIB_TX]);
127 t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance);
128 t1 = pool_elt_at_index (ngm->tunnels, hi1->dev_instance);
130 ASSERT(vec_len(t0->rewrite) >= 24);
131 ASSERT(vec_len(t1->rewrite) >= 24);
133 /* Apply the rewrite string. $$$$ vnet_rewrite? */
134 vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
135 vlib_buffer_advance (b1, -(word)_vec_len(t1->rewrite));
137 ip0 = vlib_buffer_get_current(b0);
138 ip1 = vlib_buffer_get_current(b1);
139 /* Copy the fixed header */
140 copy_dst0 = (u64 *) ip0;
141 copy_src0 = (u64 *) t0->rewrite;
142 copy_dst1 = (u64 *) ip1;
143 copy_src1 = (u64 *) t1->rewrite;
145 copy_dst0[0] = copy_src0[0];
146 copy_dst0[1] = copy_src0[1];
147 copy_dst0[2] = copy_src0[2];
149 copy_dst1[0] = copy_src1[0];
150 copy_dst1[1] = copy_src1[1];
151 copy_dst1[2] = copy_src1[2];
153 /* If there are TLVs to copy, do so */
154 if (PREDICT_FALSE (_vec_len(t0->rewrite) > 24))
155 clib_memcpy (©_dst0[3], t0->rewrite + 24 ,
156 _vec_len (t0->rewrite)-24);
158 if (PREDICT_FALSE (_vec_len(t1->rewrite) > 24))
159 clib_memcpy (©_dst1[3], t1->rewrite + 24 ,
160 _vec_len (t1->rewrite)-24);
162 /* fix the <bleep>ing outer-IP checksums */
163 sum0 = ip0->checksum;
164 /* old_l0 always 0, see the rewrite setup */
166 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
168 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
169 length /* changed member */);
170 ip0->checksum = ip_csum_fold (sum0);
171 ip0->length = new_l0;
173 sum1 = ip1->checksum;
174 /* old_l1 always 1, see the rewrite setup */
176 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
178 sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
179 length /* changed member */);
180 ip1->checksum = ip_csum_fold (sum1);
181 ip1->length = new_l1;
183 /* Reset to look up tunnel partner in the configured FIB */
184 vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
185 vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->encap_fib_index;
186 pkts_encapsulated += 2;
188 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
190 nsh_gre_encap_trace_t *tr =
191 vlib_add_trace (vm, node, b0, sizeof (*tr));
192 tr->tunnel_index = t0 - ngm->tunnels;
195 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
197 nsh_gre_encap_trace_t *tr =
198 vlib_add_trace (vm, node, b1, sizeof (*tr));
199 tr->tunnel_index = t1 - ngm->tunnels;
202 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
203 to_next, n_left_to_next,
204 bi0, bi1, next0, next1);
207 while (n_left_from > 0 && n_left_to_next > 0)
211 u32 next0 = NSH_GRE_ENCAP_NEXT_IP4_LOOKUP;
212 vnet_hw_interface_t * hi0;
214 u64 * copy_src0, * copy_dst0;
215 nsh_gre_tunnel_t * t0;
226 b0 = vlib_get_buffer (vm, bi0);
229 hi0 = vnet_get_sup_hw_interface
230 (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);
232 t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance);
234 ASSERT(vec_len(t0->rewrite) >= 24);
236 /* Apply the rewrite string. $$$$ vnet_rewrite? */
237 vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
239 ip0 = vlib_buffer_get_current(b0);
240 /* Copy the fixed header */
241 copy_dst0 = (u64 *) ip0;
242 copy_src0 = (u64 *) t0->rewrite;
243 copy_dst0[0] = copy_src0[0];
244 copy_dst0[1] = copy_src0[1];
245 copy_dst0[2] = copy_src0[2];
247 /* If there are TLVs to copy, do so */
248 if (PREDICT_FALSE (_vec_len(t0->rewrite) > 24))
249 clib_memcpy (©_dst0[3], t0->rewrite + 24 ,
250 _vec_len (t0->rewrite)-24);
252 /* fix the <bleep>ing outer-IP checksum */
253 sum0 = ip0->checksum;
254 /* old_l0 always 0, see the rewrite setup */
256 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
258 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
259 length /* changed member */);
260 ip0->checksum = ip_csum_fold (sum0);
261 ip0->length = new_l0;
263 /* Reset to look up tunnel partner in the configured FIB */
264 vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
265 pkts_encapsulated ++;
267 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
269 nsh_gre_encap_trace_t *tr =
270 vlib_add_trace (vm, node, b0, sizeof (*tr));
271 tr->tunnel_index = t0 - ngm->tunnels;
273 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
274 to_next, n_left_to_next,
278 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
280 vlib_node_increment_counter (vm, node->node_index,
281 NSH_GRE_ENCAP_ERROR_ENCAPSULATED,
283 return from_frame->n_vectors;
286 VLIB_REGISTER_NODE (nsh_gre_encap_node) = {
287 .function = nsh_gre_encap,
288 .name = "nsh-gre-encap",
289 .vector_size = sizeof (u32),
290 .format_trace = format_nsh_gre_encap_trace,
291 .type = VLIB_NODE_TYPE_INTERNAL,
293 .n_errors = ARRAY_LEN(nsh_gre_encap_error_strings),
294 .error_strings = nsh_gre_encap_error_strings,
296 .n_next_nodes = NSH_GRE_ENCAP_N_NEXT,
298 // add dispositions here
300 [NSH_GRE_ENCAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
301 [NSH_GRE_ENCAP_NEXT_DROP] = "error-drop",