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.
17 * @brief L2-GRE over IPSec packet processing.
19 * Add GRE header to thr packet and send it to the esp-encrypt node.
22 #include <vnet/vnet.h>
23 #include <vnet/ipsec-gre/ipsec_gre.h>
25 ipsec_gre_main_t ipsec_gre_main;
28 * @brief IPv4 and GRE header.
32 typedef CLIB_PACKED (struct
36 }) ip4_and_gre_header_t;
40 * @brief IPv4 and GRE header union.
47 ip4_and_gre_header_t ip4_and_gre;
50 } ip4_and_gre_union_t;
53 * @brief Packet trace.
58 u32 tunnel_id; /**< Tunnel-id / index in tunnel vector */
60 u32 length; /**< pkt length */
62 ip4_address_t src; /**< tunnel src IPv4 address */
63 ip4_address_t dst; /**< tunnel dst IPv4 address */
65 u32 sa_id; /**< tunnel IPSec SA id */
66 } ipsec_gre_tx_trace_t;
69 format_ipsec_gre_tx_trace (u8 * s, va_list * args)
71 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
72 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
73 ipsec_gre_tx_trace_t *t = va_arg (*args, ipsec_gre_tx_trace_t *);
75 s = format (s, "GRE: tunnel %d len %d src %U dst %U sa-id %d",
76 t->tunnel_id, clib_net_to_host_u16 (t->length),
77 format_ip4_address, &t->src.as_u8,
78 format_ip4_address, &t->dst.as_u8, t->sa_id);
83 * @brief IPSec-GRE tunnel interface tx function.
85 * Add GRE header to the packet.
87 * @param vm vlib_main_t corresponding to the current thread.
88 * @param node vlib_node_runtime_t data for this node.
89 * @param frame vlib_frame_t whose contents should be dispatched.
91 * @par Graph mechanics: buffer metadata, next index usage
94 * - <code>node->runtime_data</code>
95 * - Match tunnel by <code>rd->dev_instance</code> in IPSec-GRE tunnels
99 * - <code>vnet_buffer(b)->output_features.ipsec_sad_index</code>
100 * - Set IPSec Security Association for packet encryption.
101 * - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
102 * - Reset output sw_if_index.
104 * <em>Nexd Index:</em>
105 * - Dispatches the packet to the esp-encrypt node.
108 ipsec_gre_interface_tx (vlib_main_t * vm,
109 vlib_node_runtime_t * node, vlib_frame_t * frame)
111 ipsec_gre_main_t *igm = &ipsec_gre_main;
113 u32 *from, *to_next, n_left_from, n_left_to_next;
114 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
115 ipsec_gre_tunnel_t *t = pool_elt_at_index (igm->tunnels, rd->dev_instance);
117 /* Vector of buffer / pkt indices we're supposed to process */
118 from = vlib_frame_vector_args (frame);
120 /* Number of buffers / pkts */
121 n_left_from = frame->n_vectors;
123 /* Speculatively send the first buffer to the last disposition we used */
124 next_index = node->cached_next_index;
126 while (n_left_from > 0)
128 /* set up to enqueue to our disposition with index = next_index */
129 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
132 * As long as we have enough pkts left to process two pkts
133 * and prefetch two pkts...
135 while (n_left_from >= 4 && n_left_to_next >= 2)
137 vlib_buffer_t *b0, *b1;
138 ip4_header_t *ip0, *ip1;
139 ip4_and_gre_union_t *h0, *h1;
140 u32 bi0, next0, bi1, next1;
141 __attribute__ ((unused)) u8 error0, error1;
142 u16 gre_protocol0, gre_protocol1;
144 /* Prefetch the next iteration */
146 vlib_buffer_t *p2, *p3;
148 p2 = vlib_get_buffer (vm, from[2]);
149 p3 = vlib_get_buffer (vm, from[3]);
151 vlib_prefetch_buffer_header (p2, LOAD);
152 vlib_prefetch_buffer_header (p3, LOAD);
155 * Prefetch packet data. We expect to overwrite
156 * the inbound L2 header with an ip header and a
157 * gre header. Might want to prefetch the last line
158 * of rewrite space as well; need profile data
160 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
161 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
164 /* Pick up the next two buffer indices */
168 /* Speculatively enqueue them where we sent the last buffer */
176 b0 = vlib_get_buffer (vm, bi0);
177 b1 = vlib_get_buffer (vm, bi1);
179 ip0 = vlib_buffer_get_current (b0);
180 gre_protocol0 = clib_net_to_host_u16 (0x01);
182 ip1 = vlib_buffer_get_current (b1);
183 gre_protocol1 = clib_net_to_host_u16 (0x01);
185 vlib_buffer_advance (b0, -sizeof (*h0));
186 vlib_buffer_advance (b1, -sizeof (*h1));
188 h0 = vlib_buffer_get_current (b0);
189 h1 = vlib_buffer_get_current (b1);
198 ip0 = &h0->ip4_and_gre.ip4;
199 h0->ip4_and_gre.gre.protocol = gre_protocol0;
200 ip0->ip_version_and_header_length = 0x45;
202 ip0->protocol = IP_PROTOCOL_GRE;
204 ip1 = &h1->ip4_and_gre.ip4;
205 h1->ip4_and_gre.gre.protocol = gre_protocol1;
206 ip1->ip_version_and_header_length = 0x45;
208 ip1->protocol = IP_PROTOCOL_GRE;
211 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
213 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
214 ip0->src_address.as_u32 = t->tunnel_src.as_u32;
215 ip1->src_address.as_u32 = t->tunnel_src.as_u32;
216 ip0->dst_address.as_u32 = t->tunnel_dst.as_u32;
217 ip1->dst_address.as_u32 = t->tunnel_dst.as_u32;
218 ip0->checksum = ip4_header_checksum (ip0);
219 ip1->checksum = ip4_header_checksum (ip1);
221 vnet_buffer (b0)->output_features.ipsec_sad_index = t->local_sa;
222 vnet_buffer (b1)->output_features.ipsec_sad_index = t->local_sa;
224 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
225 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
227 next0 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT;
228 next1 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT;
229 error0 = IPSEC_GRE_ERROR_NONE;
230 error1 = IPSEC_GRE_ERROR_NONE;
232 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
234 ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
236 tr->tunnel_id = t - igm->tunnels;
237 tr->length = ip0->length;
238 tr->src.as_u32 = ip0->src_address.as_u32;
239 tr->dst.as_u32 = ip0->dst_address.as_u32;
240 tr->sa_id = t->local_sa_id;
243 if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
245 ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
247 tr->tunnel_id = t - igm->tunnels;
248 tr->length = ip1->length;
249 tr->src.as_u32 = ip1->src_address.as_u32;
250 tr->dst.as_u32 = ip1->dst_address.as_u32;
251 tr->sa_id = t->local_sa_id;
254 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
255 to_next, n_left_to_next,
256 bi0, bi1, next0, next1);
259 while (n_left_from > 0 && n_left_to_next > 0)
263 ip4_and_gre_union_t *h0;
265 __attribute__ ((unused)) u8 error0;
268 bi0 = to_next[0] = from[0];
274 b0 = vlib_get_buffer (vm, bi0);
276 gre_protocol0 = clib_net_to_host_u16 (0x01);
278 vlib_buffer_advance (b0, -sizeof (*h0));
280 h0 = vlib_buffer_get_current (b0);
285 ip0 = &h0->ip4_and_gre.ip4;
286 h0->ip4_and_gre.gre.protocol = gre_protocol0;
287 ip0->ip_version_and_header_length = 0x45;
289 ip0->protocol = IP_PROTOCOL_GRE;
291 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
292 ip0->src_address.as_u32 = t->tunnel_src.as_u32;
293 ip0->dst_address.as_u32 = t->tunnel_dst.as_u32;
294 ip0->checksum = ip4_header_checksum (ip0);
296 vnet_buffer (b0)->output_features.ipsec_sad_index = t->local_sa;
297 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
299 next0 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT;
300 error0 = IPSEC_GRE_ERROR_NONE;
302 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
304 ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
306 tr->tunnel_id = t - igm->tunnels;
307 tr->length = ip0->length;
308 tr->src.as_u32 = ip0->src_address.as_u32;
309 tr->dst.as_u32 = ip0->dst_address.as_u32;
310 tr->sa_id = t->local_sa_id;
313 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
314 to_next, n_left_to_next,
318 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
321 vlib_node_increment_counter (vm, ipsec_gre_input_node.index,
322 IPSEC_GRE_ERROR_PKTS_ENCAP, frame->n_vectors);
324 return frame->n_vectors;
327 static clib_error_t *
328 ipsec_gre_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
331 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
332 vnet_hw_interface_set_flags (vnm, hw_if_index,
333 VNET_HW_INTERFACE_FLAG_LINK_UP);
335 vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */ );
337 return /* no error */ 0;
341 format_ipsec_gre_tunnel_name (u8 * s, va_list * args)
343 u32 dev_instance = va_arg (*args, u32);
344 return format (s, "ipsec-gre%d", dev_instance);
348 format_ipsec_gre_device (u8 * s, va_list * args)
350 u32 dev_instance = va_arg (*args, u32);
351 CLIB_UNUSED (int verbose) = va_arg (*args, int);
353 s = format (s, "IPSEC-GRE tunnel: id %d\n", dev_instance);
358 VNET_DEVICE_CLASS (ipsec_gre_device_class) = {
359 .name = "IPSec GRE tunnel device",
360 .format_device_name = format_ipsec_gre_tunnel_name,
361 .format_device = format_ipsec_gre_device,
362 .format_tx_trace = format_ipsec_gre_tx_trace,
363 .tx_function = ipsec_gre_interface_tx,
364 .admin_up_down_function = ipsec_gre_interface_admin_up_down,
367 VLIB_DEVICE_TX_FUNCTION_MULTIARCH (ipsec_gre_device_class,
368 ipsec_gre_interface_tx)
371 VNET_HW_INTERFACE_CLASS (ipsec_gre_hw_interface_class) = {
376 static clib_error_t *
377 ipsec_gre_init (vlib_main_t * vm)
379 ipsec_gre_main_t *igm = &ipsec_gre_main;
382 memset (igm, 0, sizeof (igm[0]));
384 igm->vnet_main = vnet_get_main ();
386 if ((error = vlib_call_init_function (vm, ip_main_init)))
389 if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
392 igm->tunnel_by_key = hash_create (0, sizeof (uword));
394 return vlib_call_init_function (vm, ipsec_gre_input_init);
397 VLIB_INIT_FUNCTION (ipsec_gre_init);
400 ipsec_gre_get_main (vlib_main_t * vm)
402 vlib_call_init_function (vm, ipsec_gre_init);
403 return &ipsec_gre_main;
407 * fd.io coding-style-patch-verification: ON
410 * eval: (c-set-style "gnu")