Line data Source code
1 : /*
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:
6 : *
7 : * http://www.apache.org/licenses/LICENSE-2.0
8 : *
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.
14 : */
15 : /*
16 : * srp_interface.c: srp interfaces
17 : *
18 : * Copyright (c) 2008 Eliot Dresselhaus
19 : *
20 : * Permission is hereby granted, free of charge, to any person obtaining
21 : * a copy of this software and associated documentation files (the
22 : * "Software"), to deal in the Software without restriction, including
23 : * without limitation the rights to use, copy, modify, merge, publish,
24 : * distribute, sublicense, and/or sell copies of the Software, and to
25 : * permit persons to whom the Software is furnished to do so, subject to
26 : * the following conditions:
27 : *
28 : * The above copyright notice and this permission notice shall be
29 : * included in all copies or substantial portions of the Software.
30 : *
31 : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 : * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 : * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 : * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 : * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 : * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 : * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38 : */
39 :
40 : #include <vnet/vnet.h>
41 : #include <vnet/pg/pg.h>
42 : #include <vnet/srp/srp.h>
43 :
44 : static u8*
45 0 : srp_build_rewrite (vnet_main_t * vnm,
46 : u32 sw_if_index,
47 : vnet_link_t link_type,
48 : const void * dst_address)
49 : {
50 0 : vnet_hw_interface_t * hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
51 0 : srp_main_t * sm = &srp_main;
52 : srp_and_ethernet_header_t * h;
53 0 : u8* rewrite = NULL;
54 : u16 type;
55 0 : uword n_bytes = sizeof (h[0]);
56 :
57 0 : switch (link_type) {
58 : #define _(a,b) case VNET_LINK_##a: type = ETHERNET_TYPE_##b; break
59 0 : _ (IP4, IP4);
60 0 : _ (IP6, IP6);
61 0 : _ (MPLS, MPLS);
62 0 : _ (ARP, ARP);
63 : #undef _
64 0 : default:
65 0 : return (NULL);
66 : }
67 :
68 0 : vec_validate(rewrite, n_bytes-1);
69 0 : h = (srp_and_ethernet_header_t *)rewrite;
70 :
71 0 : clib_memcpy (h->ethernet.src_address, hw->hw_address, sizeof (h->ethernet.src_address));
72 0 : if (dst_address)
73 0 : clib_memcpy (h->ethernet.dst_address, dst_address, sizeof (h->ethernet.dst_address));
74 : else
75 0 : clib_memset (h->ethernet.dst_address, ~0, sizeof (h->ethernet.dst_address)); /* broadcast */
76 :
77 0 : h->ethernet.type = clib_host_to_net_u16 (type);
78 :
79 0 : h->srp.as_u16 = 0;
80 0 : h->srp.mode = SRP_MODE_data;
81 0 : h->srp.ttl = sm->default_data_ttl;
82 0 : srp_header_compute_parity (&h->srp);
83 :
84 0 : return (rewrite);
85 : }
86 :
87 : static void srp_register_interface_helper (u32 * hw_if_indices_by_side, u32 redistribute);
88 :
89 0 : void serialize_srp_main (serialize_main_t * m, va_list * va)
90 : {
91 0 : srp_main_t * sm = &srp_main;
92 : srp_interface_t * si;
93 :
94 0 : serialize_integer (m, pool_elts (sm->interface_pool), sizeof (u32));
95 0 : pool_foreach (si, sm->interface_pool) {
96 0 : serialize_integer (m, si->rings[SRP_RING_OUTER].hw_if_index, sizeof (u32));
97 0 : serialize_integer (m, si->rings[SRP_RING_INNER].hw_if_index, sizeof (u32));
98 : }
99 0 : }
100 :
101 0 : void unserialize_srp_main (serialize_main_t * m, va_list * va)
102 : {
103 : u32 i, n_ifs, hw_if_indices[SRP_N_RING];
104 :
105 0 : unserialize_integer (m, &n_ifs, sizeof (u32));
106 0 : for (i = 0; i < n_ifs; i++)
107 : {
108 0 : unserialize_integer (m, &hw_if_indices[SRP_RING_OUTER], sizeof (u32));
109 0 : unserialize_integer (m, &hw_if_indices[SRP_RING_INNER], sizeof (u32));
110 0 : srp_register_interface_helper (hw_if_indices, /* redistribute */ 0);
111 : }
112 0 : }
113 :
114 0 : static void srp_register_interface_helper (u32 * hw_if_indices_by_side, u32 redistribute)
115 : {
116 0 : vnet_main_t * vnm = vnet_get_main();
117 0 : srp_main_t * sm = &srp_main;
118 : srp_interface_t * si;
119 : vnet_hw_interface_t * hws[SRP_N_RING];
120 : uword s, * p;
121 :
122 : /* Check if interface has already been registered. */
123 0 : p = hash_get (sm->interface_index_by_hw_if_index, hw_if_indices_by_side[0]);
124 0 : if (p)
125 : {
126 0 : si = pool_elt_at_index (sm->interface_pool, p[0]);
127 : }
128 : else
129 : {
130 0 : pool_get (sm->interface_pool, si);
131 0 : clib_memset (si, 0, sizeof (si[0]));
132 : }
133 0 : for (s = 0; s < SRP_N_SIDE; s++)
134 : {
135 0 : hws[s] = vnet_get_hw_interface (vnm, hw_if_indices_by_side[s]);
136 0 : si->rings[s].ring = s;
137 0 : si->rings[s].hw_if_index = hw_if_indices_by_side[s];
138 0 : si->rings[s].sw_if_index = hws[s]->sw_if_index;
139 0 : hash_set (sm->interface_index_by_hw_if_index, hw_if_indices_by_side[s], si - sm->interface_pool);
140 : }
141 :
142 : /* Inherit MAC address from outer ring. */
143 0 : clib_memcpy (si->my_address, hws[SRP_RING_OUTER]->hw_address,
144 : vec_len (hws[SRP_RING_OUTER]->hw_address));
145 :
146 : /* Default time to wait to restore signal. */
147 0 : si->config.wait_to_restore_idle_delay = 60;
148 0 : si->config.ips_tx_interval = 1;
149 0 : }
150 :
151 0 : void srp_register_interface (u32 * hw_if_indices_by_side)
152 : {
153 0 : srp_register_interface_helper (hw_if_indices_by_side, /* redistribute */ 1);
154 0 : }
155 :
156 0 : void srp_interface_set_hw_wrap_function (u32 hw_if_index, srp_hw_wrap_function_t * f)
157 : {
158 0 : srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index);
159 0 : si->hw_wrap_function = f;
160 0 : }
161 :
162 0 : void srp_interface_set_hw_enable_function (u32 hw_if_index, srp_hw_enable_function_t * f)
163 : {
164 0 : srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index);
165 0 : si->hw_enable_function = f;
166 0 : }
167 :
168 0 : void srp_interface_enable_ips (u32 hw_if_index)
169 : {
170 0 : srp_main_t * sm = &srp_main;
171 0 : srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index);
172 :
173 0 : si->ips_process_enable = 1;
174 :
175 0 : vlib_node_set_state (sm->vlib_main, srp_ips_process_node.index, VLIB_NODE_STATE_POLLING);
176 0 : }
177 :
178 : static uword
179 0 : srp_is_valid_class_for_interface (vnet_main_t * vnm, u32 hw_if_index, u32 hw_class_index)
180 : {
181 0 : srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index);
182 :
183 0 : if (! si)
184 0 : return 0;
185 :
186 : /* Both sides must be admin down. */
187 0 : if (vnet_sw_interface_is_admin_up (vnm, si->rings[SRP_RING_OUTER].sw_if_index))
188 0 : return 0;
189 0 : if (vnet_sw_interface_is_admin_up (vnm, si->rings[SRP_RING_INNER].sw_if_index))
190 0 : return 0;
191 :
192 0 : return 1;
193 : }
194 :
195 : static void
196 0 : srp_interface_hw_class_change (vnet_main_t * vnm, u32 hw_if_index,
197 : u32 old_hw_class_index, u32 new_hw_class_index)
198 : {
199 0 : srp_main_t * sm = &srp_main;
200 0 : srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index);
201 : vnet_hw_interface_t * hi;
202 : vnet_device_class_t * dc;
203 : u32 r, to_srp;
204 :
205 0 : if (!si) {
206 0 : clib_warning ("srp interface no set si = 0");
207 0 : return;
208 : }
209 :
210 0 : to_srp = new_hw_class_index == srp_hw_interface_class.index;
211 :
212 : /* Changing class on either outer or inner rings implies changing the class
213 : of the other. */
214 0 : for (r = 0; r < SRP_N_RING; r++)
215 : {
216 0 : srp_interface_ring_t * ir = &si->rings[r];
217 :
218 0 : hi = vnet_get_hw_interface (vnm, ir->hw_if_index);
219 0 : dc = vnet_get_device_class (vnm, hi->dev_class_index);
220 :
221 : /* hw_if_index itself will be handled by caller. */
222 0 : if (ir->hw_if_index != hw_if_index)
223 : {
224 0 : vnet_hw_interface_init_for_class (vnm, ir->hw_if_index,
225 : new_hw_class_index,
226 0 : to_srp ? si - sm->interface_pool : ~0);
227 :
228 0 : if (dc->hw_class_change)
229 0 : dc->hw_class_change (vnm, ir->hw_if_index, new_hw_class_index);
230 : }
231 : else
232 0 : hi->hw_instance = to_srp ? si - sm->interface_pool : ~0;
233 : }
234 :
235 0 : if (si->hw_enable_function)
236 0 : si->hw_enable_function (si, /* enable */ to_srp);
237 : }
238 :
239 7279 : VNET_HW_INTERFACE_CLASS (srp_hw_interface_class) = {
240 : .name = "SRP",
241 : .format_address = format_ethernet_address,
242 : .format_header = format_srp_header_with_length,
243 : .format_device = format_srp_device,
244 : .unformat_hw_address = unformat_ethernet_address,
245 : .unformat_header = unformat_srp_header,
246 : .build_rewrite = srp_build_rewrite,
247 : .update_adjacency = ethernet_update_adjacency,
248 : .is_valid_class_for_interface = srp_is_valid_class_for_interface,
249 : .hw_class_change = srp_interface_hw_class_change,
250 : };
251 :
252 0 : void srp_interface_get_interface_config (u32 hw_if_index, srp_interface_config_t * c)
253 : {
254 0 : srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index);
255 0 : ASSERT (si != 0);
256 0 : c[0] = si->config;
257 0 : }
258 :
259 0 : void srp_interface_set_interface_config (u32 hw_if_index, srp_interface_config_t * c)
260 : {
261 0 : srp_interface_t * si = srp_get_interface_from_vnet_hw_interface (hw_if_index);
262 0 : ASSERT (si != 0);
263 0 : if (memcmp (&si->config, &c[0], sizeof (c[0])))
264 : {
265 0 : si->config = c[0];
266 : }
267 0 : }
268 :
269 : #if DEBUG > 0
270 :
271 : #define VNET_SIMULATED_SRP_TX_NEXT_SRP_INPUT VNET_INTERFACE_TX_N_NEXT
272 : /* Echo packets back to srp input. */
273 : static uword
274 : simulated_srp_interface_tx (vlib_main_t * vm,
275 : vlib_node_runtime_t * node,
276 : vlib_frame_t * frame)
277 : {
278 : u32 n_left_from, n_left_to_next, n_copy, * from, * to_next;
279 : u32 next_index = VNET_SIMULATED_SRP_TX_NEXT_SRP_INPUT;
280 : u32 i;
281 : vlib_buffer_t * b;
282 :
283 : n_left_from = frame->n_vectors;
284 : from = vlib_frame_vector_args (frame);
285 :
286 : while (n_left_from > 0)
287 : {
288 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
289 :
290 : n_copy = clib_min (n_left_from, n_left_to_next);
291 :
292 : clib_memcpy_fast (to_next, from, n_copy * sizeof (from[0]));
293 : n_left_to_next -= n_copy;
294 : n_left_from -= n_copy;
295 : for (i = 0; i < n_copy; i++)
296 : {
297 : b = vlib_get_buffer (vm, from[i]);
298 : /* TX interface will be fake eth; copy to RX for benefit of srp-input. */
299 : b->sw_if_index[VLIB_RX] = b->sw_if_index[VLIB_TX];
300 : }
301 :
302 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
303 : }
304 :
305 : return n_left_from;
306 : }
307 :
308 : static u8 * format_simulated_srp_name (u8 * s, va_list * args)
309 : {
310 : u32 dev_instance = va_arg (*args, u32);
311 : return format (s, "fake-srp%d", dev_instance);
312 : }
313 :
314 : VNET_DEVICE_CLASS (srp_simulated_device_class,static) = {
315 : .name = "Simulated srp",
316 : .format_device_name = format_simulated_srp_name,
317 : .tx_function = simulated_srp_interface_tx,
318 : };
319 :
320 : static clib_error_t *
321 : create_simulated_srp_interfaces (vlib_main_t * vm,
322 : unformat_input_t * input,
323 : vlib_cli_command_t * cmd)
324 : {
325 : vnet_main_t * vnm = vnet_get_main();
326 : u8 address[6];
327 : u32 hw_if_index;
328 : vnet_hw_interface_t * hi;
329 : static u32 instance;
330 :
331 : if (! unformat_user (input, unformat_ethernet_address, &address))
332 : {
333 : clib_memset (address, 0, sizeof (address));
334 : address[0] = 0xde;
335 : address[1] = 0xad;
336 : address[5] = instance;
337 : }
338 :
339 : hw_if_index = vnet_register_interface (vnm,
340 : srp_simulated_device_class.index,
341 : instance++,
342 : srp_hw_interface_class.index, 0);
343 :
344 : hi = vnet_get_hw_interface (vnm, hw_if_index);
345 :
346 : srp_setup_node (vm, hi->output_node_index);
347 :
348 : hi->min_packet_bytes = 40 + 16;
349 :
350 : /* Standard default ethernet MTU. */
351 : vnet_sw_interface_set_mtu (vnm, sw_if_index, 1500);
352 :
353 : vec_free (hi->hw_address);
354 : vec_add (hi->hw_address, address, sizeof (address));
355 :
356 : {
357 : uword slot;
358 :
359 : slot = vlib_node_add_named_next_with_slot
360 : (vm, hi->tx_node_index,
361 : "srp-input",
362 : VNET_SIMULATED_SRP_TX_NEXT_SRP_INPUT);
363 : ASSERT (slot == VNET_SIMULATED_SRP_TX_NEXT_SRP_INPUT);
364 : }
365 :
366 : return /* no error */ 0;
367 : }
368 :
369 : static VLIB_CLI_COMMAND (create_simulated_srp_interface_command) = {
370 : .path = "srp create-interfaces",
371 : .short_help = "Create simulated srp interface",
372 : .function = create_simulated_srp_interfaces,
373 : };
374 : #endif
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