2 * Copyright (c) 2017 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 #ifndef __included_udp_h__
16 #define __included_udp_h__
18 #include <vnet/vnet.h>
19 #include <vnet/udp/udp_packet.h>
20 #include <vnet/ip/ip.h>
21 #include <vnet/ip/ip4.h>
22 #include <vnet/ip/ip4_packet.h>
23 #include <vnet/pg/pg.h>
24 #include <vnet/ip/format.h>
26 #include <vnet/ip/ip.h>
27 #include <vnet/session/transport.h>
31 #define udp_error(n,s) UDP_ERROR_##n,
32 #include <vnet/udp/udp_error.def>
39 /** Required for pool_get_aligned */
40 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
41 transport_connection_t connection; /**< must be first */
42 clib_spinlock_t rx_lock; /**< rx fifo lock */
43 u8 is_connected; /**< connected mode */
46 #define foreach_udp4_dst_port \
48 _ (67, dhcp_to_server) \
49 _ (68, dhcp_to_client) \
65 #define foreach_udp6_dst_port \
67 _ (547, dhcpv6_to_server) \
68 _ (546, dhcpv6_to_client) \
74 _ (4790, VXLAN6_GPE) \
82 #define _(n,f) UDP_DST_PORT_##f = n,
83 foreach_udp4_dst_port foreach_udp6_dst_port
89 #define _(n,f) UDP6_DST_PORT_##f = n,
96 /* Name (a c string). */
99 /* GRE protocol type in host byte order. */
100 udp_dst_port_t dst_port;
102 /* Node which handles this type. */
105 /* Next index for this type. */
107 } udp_dst_port_info_t;
112 UDP_IP4, /* the code is full of is_ip4... */
118 udp_dst_port_info_t *dst_port_infos[N_UDP_AF];
120 /* Hash tables mapping name/protocol to protocol info index. */
121 uword *dst_port_info_by_name[N_UDP_AF];
122 uword *dst_port_info_by_dst_port[N_UDP_AF];
124 /* Sparse vector mapping udp dst_port in network byte order
126 u16 *next_by_dst_port4;
127 u16 *next_by_dst_port6;
132 * Per-worker thread udp connection pools used with session layer
134 udp_connection_t **connections;
135 u32 *connection_peekers;
136 clib_spinlock_t *peekers_readers_locks;
137 clib_spinlock_t *peekers_write_locks;
138 udp_connection_t *listener_pool;
142 extern udp_main_t udp_main;
143 extern vlib_node_registration_t udp4_input_node;
144 extern vlib_node_registration_t udp6_input_node;
146 always_inline udp_connection_t *
147 udp_connection_get (u32 conn_index, u32 thread_index)
149 if (pool_is_free_index (udp_main.connections[thread_index], conn_index))
151 return pool_elt_at_index (udp_main.connections[thread_index], conn_index);
154 always_inline udp_connection_t *
155 udp_listener_get (u32 conn_index)
157 return pool_elt_at_index (udp_main.listener_pool, conn_index);
160 always_inline udp_main_t *
166 always_inline udp_connection_t *
167 udp_get_connection_from_transport (transport_connection_t * tc)
169 return ((udp_connection_t *) tc);
173 udp_connection_index (udp_connection_t * uc)
175 return (uc - udp_main.connections[uc->c_thread_index]);
178 udp_connection_t *udp_connection_alloc (u32 thread_index);
181 * Acquires a lock that blocks a connection pool from expanding.
184 udp_pool_add_peeker (u32 thread_index)
186 if (thread_index != vlib_get_thread_index ())
188 clib_spinlock_lock_if_init (&udp_main.peekers_readers_locks[thread_index]);
189 udp_main.connection_peekers[thread_index] += 1;
190 if (udp_main.connection_peekers[thread_index] == 1)
191 clib_spinlock_lock_if_init (&udp_main.peekers_write_locks[thread_index]);
192 clib_spinlock_unlock_if_init (&udp_main.peekers_readers_locks
197 udp_pool_remove_peeker (u32 thread_index)
199 if (thread_index != vlib_get_thread_index ())
201 ASSERT (udp_main.connection_peekers[thread_index] > 0);
202 clib_spinlock_lock_if_init (&udp_main.peekers_readers_locks[thread_index]);
203 udp_main.connection_peekers[thread_index] -= 1;
204 if (udp_main.connection_peekers[thread_index] == 0)
205 clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks
207 clib_spinlock_unlock_if_init (&udp_main.peekers_readers_locks
211 always_inline udp_connection_t *
212 udp_connection_clone_safe (u32 connection_index, u32 thread_index)
214 udp_connection_t *old_c, *new_c;
215 u32 current_thread_index = vlib_get_thread_index ();
216 new_c = udp_connection_alloc (current_thread_index);
218 /* If during the memcpy pool is reallocated AND the memory allocator
219 * decides to give the old chunk of memory to somebody in a hurry to
220 * scribble something on it, we have a problem. So add this thread as
221 * a session pool peeker.
223 udp_pool_add_peeker (thread_index);
224 old_c = udp_main.connections[thread_index] + connection_index;
225 clib_memcpy (new_c, old_c, sizeof (*new_c));
226 udp_pool_remove_peeker (thread_index);
227 new_c->c_thread_index = current_thread_index;
228 new_c->c_c_index = udp_connection_index (new_c);
233 always_inline udp_dst_port_info_t *
234 udp_get_dst_port_info (udp_main_t * um, udp_dst_port_t dst_port, u8 is_ip4)
236 uword *p = hash_get (um->dst_port_info_by_dst_port[is_ip4], dst_port);
237 return p ? vec_elt_at_index (um->dst_port_infos[is_ip4], p[0]) : 0;
240 format_function_t format_udp_header;
241 format_function_t format_udp_rx_trace;
242 unformat_function_t unformat_udp_header;
244 void udp_register_dst_port (vlib_main_t * vm,
245 udp_dst_port_t dst_port,
246 u32 node_index, u8 is_ip4);
247 void udp_unregister_dst_port (vlib_main_t * vm,
248 udp_dst_port_t dst_port, u8 is_ip4);
250 void udp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
253 vlib_buffer_push_udp (vlib_buffer_t * b, u16 sp, u16 dp, u8 offload_csum)
257 uh = vlib_buffer_push_uninit (b, sizeof (udp_header_t));
261 uh->length = clib_host_to_net_u16 (b->current_length);
264 b->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
265 vnet_buffer (b)->l4_hdr_offset = (u8 *) uh - b->data;
271 ip_udp_fixup_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 is_ip4)
282 ip0 = vlib_buffer_get_current (b0);
284 /* fix the <bleep>ing outer-IP checksum */
285 sum0 = ip0->checksum;
286 /* old_l0 always 0, see the rewrite setup */
287 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
289 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
290 length /* changed member */ );
291 ip0->checksum = ip_csum_fold (sum0);
292 ip0->length = new_l0;
295 udp0 = (udp_header_t *) (ip0 + 1);
296 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
298 udp0->length = new_l0;
305 ip0 = vlib_buffer_get_current (b0);
307 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
309 ip0->payload_length = new_l0;
312 udp0 = (udp_header_t *) (ip0 + 1);
313 udp0->length = new_l0;
316 ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
317 ASSERT (bogus0 == 0);
319 if (udp0->checksum == 0)
320 udp0->checksum = 0xffff;
325 ip_udp_encap_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 * ec0, word ec_len,
328 vlib_buffer_advance (b0, -ec_len);
334 ip0 = vlib_buffer_get_current (b0);
336 /* Apply the encap string. */
337 clib_memcpy (ip0, ec0, ec_len);
338 ip_udp_fixup_one (vm, b0, 1);
344 ip0 = vlib_buffer_get_current (b0);
346 /* Apply the encap string. */
347 clib_memcpy (ip0, ec0, ec_len);
348 ip_udp_fixup_one (vm, b0, 0);
353 ip_udp_encap_two (vlib_main_t * vm, vlib_buffer_t * b0, vlib_buffer_t * b1,
354 u8 * ec0, u8 * ec1, word ec_len, u8 is_v4)
357 udp_header_t *udp0, *udp1;
359 ASSERT (_vec_len (ec0) == _vec_len (ec1));
361 vlib_buffer_advance (b0, -ec_len);
362 vlib_buffer_advance (b1, -ec_len);
366 ip4_header_t *ip0, *ip1;
367 ip_csum_t sum0, sum1;
368 u16 old_l0 = 0, old_l1 = 0;
370 ip0 = vlib_buffer_get_current (b0);
371 ip1 = vlib_buffer_get_current (b1);
373 /* Apply the encap string */
374 clib_memcpy (ip0, ec0, ec_len);
375 clib_memcpy (ip1, ec1, ec_len);
377 /* fix the <bleep>ing outer-IP checksum */
378 sum0 = ip0->checksum;
379 sum1 = ip1->checksum;
381 /* old_l0 always 0, see the rewrite setup */
382 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
383 new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
385 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
386 length /* changed member */ );
387 sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
388 length /* changed member */ );
390 ip0->checksum = ip_csum_fold (sum0);
391 ip1->checksum = ip_csum_fold (sum1);
393 ip0->length = new_l0;
394 ip1->length = new_l1;
397 udp0 = (udp_header_t *) (ip0 + 1);
398 udp1 = (udp_header_t *) (ip1 + 1);
401 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
404 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1) -
406 udp0->length = new_l0;
407 udp1->length = new_l1;
411 ip6_header_t *ip0, *ip1;
414 ip0 = vlib_buffer_get_current (b0);
415 ip1 = vlib_buffer_get_current (b1);
417 /* Apply the encap string. */
418 clib_memcpy (ip0, ec0, ec_len);
419 clib_memcpy (ip1, ec1, ec_len);
421 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
423 new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
425 ip0->payload_length = new_l0;
426 ip1->payload_length = new_l1;
429 udp0 = (udp_header_t *) (ip0 + 1);
430 udp1 = (udp_header_t *) (ip1 + 1);
432 udp0->length = new_l0;
433 udp1->length = new_l1;
436 ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
438 ip6_tcp_udp_icmp_compute_checksum (vm, b1, ip1, &bogus1);
439 ASSERT (bogus0 == 0);
440 ASSERT (bogus1 == 0);
442 if (udp0->checksum == 0)
443 udp0->checksum = 0xffff;
444 if (udp1->checksum == 0)
445 udp1->checksum = 0xffff;
450 * fd.io coding-style-patch-verification: ON
453 * eval: (c-set-style "gnu")
457 #endif /* __included_udp_h__ */