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-vxlan-gpe/nsh_vxlan_gpe.h>
22 /* Statistics (not really errors) */
23 #define foreach_nsh_vxlan_gpe_encap_error \
24 _(ENCAPSULATED, "good packets encapsulated")
26 static char * nsh_vxlan_gpe_encap_error_strings[] = {
27 #define _(sym,string) string,
28 foreach_nsh_vxlan_gpe_encap_error
33 #define _(sym,str) NSH_VXLAN_GPE_ENCAP_ERROR_##sym,
34 foreach_nsh_vxlan_gpe_encap_error
36 NSH_VXLAN_GPE_ENCAP_N_ERROR,
37 } nsh_vxlan_gpe_encap_error_t;
40 NSH_VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP,
41 NSH_VXLAN_GPE_ENCAP_NEXT_DROP,
42 NSH_VXLAN_GPE_ENCAP_N_NEXT,
43 } nsh_vxlan_gpe_encap_next_t;
47 } nsh_vxlan_gpe_encap_trace_t;
49 u8 * format_nsh_vxlan_gpe_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_vxlan_gpe_encap_trace_t * t
54 = va_arg (*args, nsh_vxlan_gpe_encap_trace_t *);
56 s = format (s, "NSH-VXLAN-ENCAP: tunnel %d", t->tunnel_index);
60 #define foreach_fixed_header_offset \
61 _(0) _(1) _(2) _(3) _(4) _(5) _(6)
64 nsh_vxlan_gpe_encap (vlib_main_t * vm,
65 vlib_node_runtime_t * node,
66 vlib_frame_t * from_frame)
68 u32 n_left_from, next_index, * from, * to_next;
69 nsh_vxlan_gpe_main_t * ngm = &nsh_vxlan_gpe_main;
70 vnet_main_t * vnm = ngm->vnet_main;
71 vnet_interface_main_t * im = &vnm->interface_main;
72 u32 pkts_encapsulated = 0;
73 u16 old_l0 = 0, old_l1 = 0;
74 u32 cpu_index = os_get_cpu_number();
75 u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
77 from = vlib_frame_vector_args (from_frame);
78 n_left_from = from_frame->n_vectors;
80 next_index = node->cached_next_index;
81 stats_sw_if_index = node->runtime_data[0];
82 stats_n_packets = stats_n_bytes = 0;
84 while (n_left_from > 0)
88 vlib_get_next_frame (vm, node, next_index,
89 to_next, n_left_to_next);
91 while (n_left_from >= 4 && n_left_to_next >= 2)
94 vlib_buffer_t * b0, * b1;
95 u32 next0 = NSH_VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;
96 u32 next1 = NSH_VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;
97 u32 sw_if_index0, sw_if_index1, len0, len1;
98 vnet_hw_interface_t * hi0, * hi1;
99 ip4_header_t * ip0, * ip1;
100 udp_header_t * udp0, * udp1;
101 u64 * copy_src0, * copy_dst0;
102 u64 * copy_src1, * copy_dst1;
103 u32 * copy_src_last0, * copy_dst_last0;
104 u32 * copy_src_last1, * copy_dst_last1;
105 nsh_vxlan_gpe_tunnel_t * t0, * t1;
107 ip_csum_t sum0, sum1;
109 /* Prefetch next iteration. */
111 vlib_buffer_t * p2, * p3;
113 p2 = vlib_get_buffer (vm, from[2]);
114 p3 = vlib_get_buffer (vm, from[3]);
116 vlib_prefetch_buffer_header (p2, LOAD);
117 vlib_prefetch_buffer_header (p3, LOAD);
119 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
120 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
132 b0 = vlib_get_buffer (vm, bi0);
133 b1 = vlib_get_buffer (vm, bi1);
136 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
137 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
138 hi0 = vnet_get_sup_hw_interface
139 (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);
140 hi1 = vnet_get_sup_hw_interface
141 (vnm, vnet_buffer(b1)->sw_if_index[VLIB_TX]);
143 t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance);
144 t1 = pool_elt_at_index (ngm->tunnels, hi1->dev_instance);
146 ASSERT(vec_len(t0->rewrite) >= 24);
147 ASSERT(vec_len(t1->rewrite) >= 24);
149 /* Apply the rewrite string. $$$$ vnet_rewrite? */
150 vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
151 vlib_buffer_advance (b1, -(word)_vec_len(t1->rewrite));
153 ip0 = vlib_buffer_get_current(b0);
154 ip1 = vlib_buffer_get_current(b1);
155 /* Copy the fixed header */
156 copy_dst0 = (u64 *) ip0;
157 copy_src0 = (u64 *) t0->rewrite;
158 copy_dst1 = (u64 *) ip1;
159 copy_src1 = (u64 *) t1->rewrite;
161 ASSERT (sizeof (ip4_vxlan_gpe_and_nsh_header_t) == 60);
163 /* Copy first 56 octets 8-bytes at a time */
164 #define _(offs) copy_dst0[offs] = copy_src0[offs];
165 foreach_fixed_header_offset;
167 #define _(offs) copy_dst1[offs] = copy_src1[offs];
168 foreach_fixed_header_offset;
171 /* Last 4 octets. Hopefully gcc will be our friend */
172 copy_dst_last0 = (u32 *)(©_dst0[7]);
173 copy_src_last0 = (u32 *)(©_src0[7]);
174 copy_dst_last1 = (u32 *)(©_dst1[7]);
175 copy_src_last1 = (u32 *)(©_src1[7]);
177 copy_dst_last0[0] = copy_src_last0[0];
178 copy_dst_last1[0] = copy_src_last1[0];
180 /* If there are TLVs to copy, do so */
181 if (PREDICT_FALSE (_vec_len(t0->rewrite) > 64))
182 clib_memcpy (©_dst0[3], t0->rewrite + 64 ,
183 _vec_len (t0->rewrite)-64);
185 if (PREDICT_FALSE (_vec_len(t1->rewrite) > 64))
186 clib_memcpy (©_dst0[3], t1->rewrite + 64 ,
187 _vec_len (t1->rewrite)-64);
189 /* fix the <bleep>ing outer-IP checksum */
190 sum0 = ip0->checksum;
191 /* old_l0 always 0, see the rewrite setup */
193 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
195 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
196 length /* changed member */);
197 ip0->checksum = ip_csum_fold (sum0);
198 ip0->length = new_l0;
200 sum1 = ip1->checksum;
201 /* old_l1 always 0, see the rewrite setup */
203 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
205 sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
206 length /* changed member */);
207 ip1->checksum = ip_csum_fold (sum1);
208 ip1->length = new_l1;
211 udp0 = (udp_header_t *)(ip0+1);
212 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
214 udp1 = (udp_header_t *)(ip1+1);
215 new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
218 udp0->length = new_l0;
219 udp1->length = new_l1;
221 /* Reset to look up tunnel partner in the configured FIB */
222 vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
223 vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->encap_fib_index;
224 vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
225 vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1;
226 pkts_encapsulated += 2;
228 len0 = vlib_buffer_length_in_chain(vm, b0);
229 len1 = vlib_buffer_length_in_chain(vm, b0);
230 stats_n_packets += 2;
231 stats_n_bytes += len0 + len1;
233 /* Batch stats increment on the same vxlan tunnel so counter is not
234 incremented per packet. Note stats are still incremented for deleted
235 and admin-down tunnel where packets are dropped. It is not worthwhile
236 to check for this rare case and affect normal path performance. */
238 (sw_if_index0 != stats_sw_if_index)
239 || (sw_if_index1 != stats_sw_if_index))) {
240 stats_n_packets -= 2;
241 stats_n_bytes -= len0 + len1;
242 if (sw_if_index0 == sw_if_index1) {
244 vlib_increment_combined_counter(
245 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
246 cpu_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
247 stats_sw_if_index = sw_if_index0;
249 stats_n_bytes = len0 + len1;
251 vlib_increment_combined_counter(
252 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
253 cpu_index, sw_if_index0, 1, len0);
254 vlib_increment_combined_counter(
255 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
256 cpu_index, sw_if_index1, 1, len1);
260 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
262 nsh_vxlan_gpe_encap_trace_t *tr =
263 vlib_add_trace (vm, node, b0, sizeof (*tr));
264 tr->tunnel_index = t0 - ngm->tunnels;
267 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
269 nsh_vxlan_gpe_encap_trace_t *tr =
270 vlib_add_trace (vm, node, b1, sizeof (*tr));
271 tr->tunnel_index = t1 - ngm->tunnels;
274 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
275 to_next, n_left_to_next,
276 bi0, bi1, next0, next1);
279 while (n_left_from > 0 && n_left_to_next > 0)
283 u32 next0 = NSH_VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;
284 u32 sw_if_index0, len0;
285 vnet_hw_interface_t * hi0;
288 u64 * copy_src0, * copy_dst0;
289 u32 * copy_src_last0, * copy_dst_last0;
290 nsh_vxlan_gpe_tunnel_t * t0;
301 b0 = vlib_get_buffer (vm, bi0);
304 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
305 hi0 = vnet_get_sup_hw_interface
306 (vnm, vnet_buffer(b0)->sw_if_index[VLIB_TX]);
308 t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance);
310 ASSERT(vec_len(t0->rewrite) >= 24);
312 /* Apply the rewrite string. $$$$ vnet_rewrite? */
313 vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
315 ip0 = vlib_buffer_get_current(b0);
316 /* Copy the fixed header */
317 copy_dst0 = (u64 *) ip0;
318 copy_src0 = (u64 *) t0->rewrite;
320 ASSERT (sizeof (ip4_vxlan_gpe_and_nsh_header_t) == 60);
322 /* Copy first 56 octets 8-bytes at a time */
323 #define _(offs) copy_dst0[offs] = copy_src0[offs];
324 foreach_fixed_header_offset;
326 /* Last 4 octets. Hopefully gcc will be our friend */
327 copy_dst_last0 = (u32 *)(©_dst0[7]);
328 copy_src_last0 = (u32 *)(©_src0[7]);
330 copy_dst_last0[0] = copy_src_last0[0];
332 /* If there are TLVs to copy, do so */
333 if (PREDICT_FALSE (_vec_len(t0->rewrite) > 64))
334 clib_memcpy (©_dst0[3], t0->rewrite + 64 ,
335 _vec_len (t0->rewrite)-64);
337 /* fix the <bleep>ing outer-IP checksum */
338 sum0 = ip0->checksum;
339 /* old_l0 always 0, see the rewrite setup */
341 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
343 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
344 length /* changed member */);
345 ip0->checksum = ip_csum_fold (sum0);
346 ip0->length = new_l0;
349 udp0 = (udp_header_t *)(ip0+1);
350 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
353 udp0->length = new_l0;
355 /* Reset to look up tunnel partner in the configured FIB */
356 vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
357 vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
358 pkts_encapsulated ++;
360 len0 = vlib_buffer_length_in_chain(vm, b0);
361 stats_n_packets += 1;
362 stats_n_bytes += len0;
364 /* Batch stats increment on the same vxlan tunnel so counter is not
365 incremented per packet. Note stats are still incremented for deleted
366 and admin-down tunnel where packets are dropped. It is not worthwhile
367 to check for this rare case and affect normal path performance. */
368 if (PREDICT_FALSE(sw_if_index0 != stats_sw_if_index)) {
369 stats_n_packets -= 1;
370 stats_n_bytes -= len0;
372 vlib_increment_combined_counter(
373 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
374 cpu_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
376 stats_n_bytes = len0;
377 stats_sw_if_index = sw_if_index0;
379 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
381 nsh_vxlan_gpe_encap_trace_t *tr =
382 vlib_add_trace (vm, node, b0, sizeof (*tr));
383 tr->tunnel_index = t0 - ngm->tunnels;
385 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
386 to_next, n_left_to_next,
390 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
392 vlib_node_increment_counter (vm, node->node_index,
393 NSH_VXLAN_GPE_ENCAP_ERROR_ENCAPSULATED,
395 /* Increment any remaining batch stats */
396 if (stats_n_packets) {
397 vlib_increment_combined_counter(
398 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, cpu_index,
399 stats_sw_if_index, stats_n_packets, stats_n_bytes);
400 node->runtime_data[0] = stats_sw_if_index;
403 return from_frame->n_vectors;
406 VLIB_REGISTER_NODE (nsh_vxlan_gpe_encap_node) = {
407 .function = nsh_vxlan_gpe_encap,
408 .name = "nsh-vxlan-gpe-encap",
409 .vector_size = sizeof (u32),
410 .format_trace = format_nsh_vxlan_gpe_encap_trace,
411 .type = VLIB_NODE_TYPE_INTERNAL,
413 .n_errors = ARRAY_LEN(nsh_vxlan_gpe_encap_error_strings),
414 .error_strings = nsh_vxlan_gpe_encap_error_strings,
416 .n_next_nodes = NSH_VXLAN_GPE_ENCAP_N_NEXT,
419 [NSH_VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
420 [NSH_VXLAN_GPE_ENCAP_NEXT_DROP] = "error-drop",