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Dave Barach68b0fb02017-02-28 15:15:56 -05001/*
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:
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#include <vnet/session/application_interface.h>
16
17#include <vnet/session/session.h>
18#include <vlibmemory/api.h>
19#include <vnet/dpo/load_balance.h>
20#include <vnet/fib/ip4_fib.h>
21
22/** @file
23 VPP's application/session API bind/unbind/connect/disconnect calls
24*/
25
26static u8
27ip_is_zero (ip46_address_t * ip46_address, u8 is_ip4)
28{
29 if (is_ip4)
30 return (ip46_address->ip4.as_u32 == 0);
31 else
32 return (ip46_address->as_u64[0] == 0 && ip46_address->as_u64[1] == 0);
33}
34
35static u8
36ip_is_local (ip46_address_t * ip46_address, u8 is_ip4)
37{
38 fib_node_index_t fei;
39 fib_entry_flag_t flags;
40 fib_prefix_t prefix;
41
42 /* Check if requester is local */
43 if (is_ip4)
44 {
45 prefix.fp_len = 32;
46 prefix.fp_proto = FIB_PROTOCOL_IP4;
47 }
48 else
49 {
50 prefix.fp_len = 128;
51 prefix.fp_proto = FIB_PROTOCOL_IP6;
52 }
53
Florin Corase04c2992017-03-01 08:17:34 -080054 clib_memcpy (&prefix.fp_addr, ip46_address, sizeof (ip46_address_t));
Dave Barach68b0fb02017-02-28 15:15:56 -050055 fei = fib_table_lookup (0, &prefix);
56 flags = fib_entry_get_flags (fei);
57
58 return (flags & FIB_ENTRY_FLAG_LOCAL);
59}
60
61int
62api_parse_session_handle (u64 handle, u32 * session_index, u32 * thread_index)
63{
64 session_manager_main_t *smm = vnet_get_session_manager_main ();
65 stream_session_t *pool;
66
67 *thread_index = handle & 0xFFFFFFFF;
68 *session_index = handle >> 32;
69
70 if (*thread_index >= vec_len (smm->sessions))
71 return VNET_API_ERROR_INVALID_VALUE;
72
73 pool = smm->sessions[*thread_index];
74
75 if (pool_is_free_index (pool, *session_index))
76 return VNET_API_ERROR_INVALID_VALUE_2;
77
78 return 0;
79}
80
81int
82vnet_bind_i (u32 api_client_index, ip46_address_t * ip46, u16 port_host_order,
83 session_type_t sst, u64 * options, session_cb_vft_t * cb_fns,
84 application_t ** app, u32 * len_seg_name, char *seg_name)
85{
86 u8 *segment_name = 0;
87 application_t *server = 0;
88 stream_session_t *listener;
89 u8 is_ip4;
90
91 listener =
92 stream_session_lookup_listener (ip46,
93 clib_host_to_net_u16 (port_host_order),
94 sst);
95
96 if (listener)
97 return VNET_API_ERROR_ADDRESS_IN_USE;
98
99 if (application_lookup (api_client_index))
100 {
101 clib_warning ("Only one bind supported for now");
102 return VNET_API_ERROR_ADDRESS_IN_USE;
103 }
104
105 is_ip4 = SESSION_TYPE_IP4_UDP == sst || SESSION_TYPE_IP4_TCP == sst;
106 if (!ip_is_zero (ip46, is_ip4) && !ip_is_local (ip46, is_ip4))
107 return VNET_API_ERROR_INVALID_VALUE;
108
109 /* Allocate and initialize stream server */
110 server = application_new (APP_SERVER, sst, api_client_index,
111 options[SESSION_OPTIONS_FLAGS], cb_fns);
112
113 application_server_init (server, options[SESSION_OPTIONS_SEGMENT_SIZE],
114 options[SESSION_OPTIONS_ADD_SEGMENT_SIZE],
115 options[SESSION_OPTIONS_RX_FIFO_SIZE],
116 options[SESSION_OPTIONS_TX_FIFO_SIZE],
117 &segment_name);
118
119 /* Setup listen path down to transport */
120 stream_session_start_listen (server->index, ip46, port_host_order);
121
122 /*
123 * Return values
124 */
125
126 ASSERT (vec_len (segment_name) <= 128);
127 *len_seg_name = vec_len (segment_name);
128 memcpy (seg_name, segment_name, *len_seg_name);
129 *app = server;
130
131 return 0;
132}
133
134int
135vnet_unbind_i (u32 api_client_index)
136{
137 application_t *server;
138
139 /*
140 * Find the stream_server_t corresponding to the api client
141 */
142 server = application_lookup (api_client_index);
143 if (!server)
144 return VNET_API_ERROR_INVALID_VALUE_2;
145
146 /* Clear the listener */
147 stream_session_stop_listen (server->index);
148 application_del (server);
149
150 return 0;
151}
152
153int
154vnet_connect_i (u32 api_client_index, u32 api_context, session_type_t sst,
155 ip46_address_t * ip46, u16 port, u64 * options, void *mp,
156 session_cb_vft_t * cb_fns)
157{
158 stream_session_t *listener;
159 application_t *server, *app;
160
161 /*
162 * Figure out if connecting to a local server
163 */
164 listener = stream_session_lookup_listener (ip46,
165 clib_host_to_net_u16 (port),
166 sst);
167 if (listener)
168 {
169 server = application_get (listener->app_index);
170
171 /*
172 * Server is willing to have a direct fifo connection created
173 * instead of going through the state machine, etc.
174 */
175 if (server->flags & SESSION_OPTIONS_FLAGS_USE_FIFO)
176 return server->cb_fns.
177 redirect_connect_callback (server->api_client_index, mp);
178 }
179
180 /* Create client app */
181 app = application_new (APP_CLIENT, sst, api_client_index,
182 options[SESSION_OPTIONS_FLAGS], cb_fns);
183
184 app->api_context = api_context;
185
186 /*
187 * Not connecting to a local server. Create regular session
188 */
Florin Corase04c2992017-03-01 08:17:34 -0800189 return stream_session_open (sst, ip46, port, app->index);
Dave Barach68b0fb02017-02-28 15:15:56 -0500190}
191
192/**
193 * unformat a vnet URI
194 *
195 * fifo://name
196 * tcp://ip46-addr:port
197 * udp://ip46-addr:port
198 *
199 * u8 ip46_address[16];
200 * u16 port_in_host_byte_order;
201 * stream_session_type_t sst;
202 * u8 *fifo_name;
203 *
204 * if (unformat (input, "%U", unformat_vnet_uri, &ip46_address,
205 * &sst, &port, &fifo_name))
206 * etc...
207 *
208 */
209uword
210unformat_vnet_uri (unformat_input_t * input, va_list * args)
211{
212 ip46_address_t *address = va_arg (*args, ip46_address_t *);
213 session_type_t *sst = va_arg (*args, session_type_t *);
214 u16 *port = va_arg (*args, u16 *);
215
216 if (unformat (input, "tcp://%U/%d", unformat_ip4_address, &address->ip4,
217 port))
218 {
219 *sst = SESSION_TYPE_IP4_TCP;
220 return 1;
221 }
222 if (unformat (input, "udp://%U/%d", unformat_ip4_address, &address->ip4,
223 port))
224 {
225 *sst = SESSION_TYPE_IP4_UDP;
226 return 1;
227 }
228 if (unformat (input, "udp://%U/%d", unformat_ip6_address, &address->ip6,
229 port))
230 {
231 *sst = SESSION_TYPE_IP6_UDP;
232 return 1;
233 }
234 if (unformat (input, "tcp://%U/%d", unformat_ip6_address, &address->ip6,
235 port))
236 {
237 *sst = SESSION_TYPE_IP6_TCP;
238 return 1;
239 }
240
241 return 0;
242}
243
244int
245parse_uri (char *uri, session_type_t * sst, ip46_address_t * addr,
246 u16 * port_number_host_byte_order)
247{
248 unformat_input_t _input, *input = &_input;
249
250 /* Make sure */
251 uri = (char *) format (0, "%s%c", uri, 0);
252
253 /* Parse uri */
254 unformat_init_string (input, uri, strlen (uri));
255 if (!unformat (input, "%U", unformat_vnet_uri, addr, sst,
256 port_number_host_byte_order))
257 {
258 unformat_free (input);
259 return VNET_API_ERROR_INVALID_VALUE;
260 }
261 unformat_free (input);
262
263 return 0;
264}
265
266int
267vnet_bind_uri (vnet_bind_args_t * a)
268{
269 application_t *server = 0;
270 u16 port_host_order;
271 session_type_t sst = SESSION_N_TYPES;
272 ip46_address_t ip46;
273 int rv;
274
275 memset (&ip46, 0, sizeof (ip46));
276 rv = parse_uri (a->uri, &sst, &ip46, &port_host_order);
277 if (rv)
278 return rv;
279
280 if ((rv = vnet_bind_i (a->api_client_index, &ip46, port_host_order, sst,
281 a->options, a->session_cb_vft, &server,
282 &a->segment_name_length, a->segment_name)))
283 return rv;
284
285 a->server_event_queue_address = (u64) server->event_queue;
286 return 0;
287}
288
289session_type_t
290session_type_from_proto_and_ip (session_api_proto_t proto, u8 is_ip4)
291{
292 if (proto == SESSION_PROTO_TCP)
293 {
294 if (is_ip4)
295 return SESSION_TYPE_IP4_TCP;
296 else
297 return SESSION_TYPE_IP6_TCP;
298 }
299 else
300 {
301 if (is_ip4)
302 return SESSION_TYPE_IP4_UDP;
303 else
304 return SESSION_TYPE_IP6_UDP;
305 }
306
307 return SESSION_N_TYPES;
308}
309
310int
311vnet_unbind_uri (char *uri, u32 api_client_index)
312{
313 u16 port_number_host_byte_order;
314 session_type_t sst = SESSION_N_TYPES;
315 ip46_address_t ip46_address;
316 stream_session_t *listener;
317 int rv;
318
319 rv = parse_uri (uri, &sst, &ip46_address, &port_number_host_byte_order);
320 if (rv)
321 return rv;
322
323 listener =
324 stream_session_lookup_listener (&ip46_address,
325 clib_host_to_net_u16
326 (port_number_host_byte_order), sst);
327
328 if (!listener)
329 return VNET_API_ERROR_ADDRESS_NOT_IN_USE;
330
331 /* External client? */
332 if (api_client_index != ~0)
333 {
334 ASSERT (vl_api_client_index_to_registration (api_client_index));
335 }
336
337 return vnet_unbind_i (api_client_index);
338}
339
340int
341vnet_connect_uri (vnet_connect_args_t * a)
342{
343 ip46_address_t ip46_address;
344 u16 port;
345 session_type_t sst;
346 application_t *app;
347 int rv;
348
349 app = application_lookup (a->api_client_index);
350 if (app)
351 {
352 clib_warning ("Already have a connect from this app");
353 return VNET_API_ERROR_INVALID_VALUE_2;
354 }
355
356 /* Parse uri */
357 rv = parse_uri (a->uri, &sst, &ip46_address, &port);
358 if (rv)
359 return rv;
360
361 return vnet_connect_i (a->api_client_index, a->api_context, sst,
362 &ip46_address, port, a->options, a->mp,
363 a->session_cb_vft);
364}
365
366int
367vnet_disconnect_session (u32 client_index, u32 session_index,
368 u32 thread_index)
369{
370 stream_session_t *session;
371
372 session = stream_session_get (session_index, thread_index);
373 stream_session_disconnect (session);
374
375 return 0;
376}
377
378
379int
380vnet_bind (vnet_bind_args_t * a)
381{
382 application_t *server = 0;
383 session_type_t sst = SESSION_N_TYPES;
384 int rv;
385
386 sst = session_type_from_proto_and_ip (a->proto, a->tep.is_ip4);
387 if ((rv = vnet_bind_i (a->api_client_index, &a->tep.ip, a->tep.port, sst,
388 a->options, a->session_cb_vft, &server,
389 &a->segment_name_length, a->segment_name)))
390 return rv;
391
392 a->server_event_queue_address = (u64) server->event_queue;
393 a->handle = (u64) a->tep.vrf << 32 | (u64) server->session_index;
394 return 0;
395}
396
397int
398vnet_unbind (vnet_unbind_args_t * a)
399{
400 application_t *server;
401
402 if (a->api_client_index != ~0)
403 {
404 ASSERT (vl_api_client_index_to_registration (a->api_client_index));
405 }
406
407 /* Make sure this is the right one */
408 server = application_lookup (a->api_client_index);
409 ASSERT (server->session_index == (0xFFFFFFFF & a->handle));
410
411 /* TODO use handle to disambiguate namespaces/vrfs */
412 return vnet_unbind_i (a->api_client_index);
413}
414
415int
416vnet_connect (vnet_connect_args_t * a)
417{
418 session_type_t sst;
419 application_t *app;
420
421 app = application_lookup (a->api_client_index);
422 if (app)
423 {
424 clib_warning ("Already have a connect from this app");
425 return VNET_API_ERROR_INVALID_VALUE_2;
426 }
427
428 sst = session_type_from_proto_and_ip (a->proto, a->tep.is_ip4);
429 return vnet_connect_i (a->api_client_index, a->api_context, sst, &a->tep.ip,
430 a->tep.port, a->options, a->mp, a->session_cb_vft);
431}
432
433int
434vnet_disconnect (vnet_disconnect_args_t * a)
435{
436 stream_session_t *session;
437 u32 session_index, thread_index;
438
439 if (api_parse_session_handle (a->handle, &session_index, &thread_index))
440 {
441 clib_warning ("Invalid handle");
442 return -1;
443 }
444
445 session = stream_session_get (session_index, thread_index);
446 stream_session_disconnect (session);
447
448 return 0;
449}
450
451/*
452 * fd.io coding-style-patch-verification: ON
453 *
454 * Local Variables:
455 * eval: (c-set-style "gnu")
456 * End:
457 */