2 * Copyright (c) 2017-2019 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 UDP_CONN_F_CONNECTED = 1 << 0, /**< connected mode */
40 UDP_CONN_F_OWNS_PORT = 1 << 1, /**< port belong to conn (UDPC) */
41 UDP_CONN_F_CLOSING = 1 << 2, /**< conn closed with data */
46 /** Required for pool_get_aligned */
47 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
48 transport_connection_t connection; /**< must be first */
49 clib_spinlock_t rx_lock; /**< rx fifo lock */
50 u8 flags; /**< connection flags */
53 #define foreach_udp4_dst_port \
55 _ (67, dhcp_to_server) \
56 _ (68, dhcp_to_client) \
67 _ (48879, vxlan_gbp) \
74 #define foreach_udp6_dst_port \
76 _ (547, dhcpv6_to_server) \
77 _ (546, dhcpv6_to_client) \
83 _ (48879, vxlan6_gbp) \
84 _ (4790, VXLAN6_GPE) \
92 #define _(n,f) UDP_DST_PORT_##f = n,
93 foreach_udp4_dst_port foreach_udp6_dst_port
99 #define _(n,f) UDP6_DST_PORT_##f = n,
100 foreach_udp6_dst_port
106 /* Name (a c string). */
109 /* GRE protocol type in host byte order. */
110 udp_dst_port_t dst_port;
112 /* Node which handles this type. */
115 /* Next index for this type. */
118 /* Parser for packet generator edits for this protocol */
119 unformat_function_t *unformat_pg_edit;
120 } udp_dst_port_info_t;
125 UDP_IP4, /* the code is full of is_ip4... */
131 udp_dst_port_info_t *dst_port_infos[N_UDP_AF];
133 /* Hash tables mapping name/protocol to protocol info index. */
134 uword *dst_port_info_by_name[N_UDP_AF];
135 uword *dst_port_info_by_dst_port[N_UDP_AF];
137 /* Sparse vector mapping udp dst_port in network byte order
139 u16 *next_by_dst_port4;
140 u16 *next_by_dst_port6;
145 * Per-worker thread udp connection pools used with session layer
147 udp_connection_t **connections;
148 u32 *connection_peekers;
149 clib_spinlock_t *peekers_readers_locks;
150 clib_spinlock_t *peekers_write_locks;
151 udp_connection_t *listener_pool;
155 extern udp_main_t udp_main;
156 extern vlib_node_registration_t udp4_input_node;
157 extern vlib_node_registration_t udp6_input_node;
158 extern vlib_node_registration_t udp4_local_node;
159 extern vlib_node_registration_t udp6_local_node;
161 always_inline udp_connection_t *
162 udp_connection_get (u32 conn_index, u32 thread_index)
164 if (pool_is_free_index (udp_main.connections[thread_index], conn_index))
166 return pool_elt_at_index (udp_main.connections[thread_index], conn_index);
169 always_inline udp_connection_t *
170 udp_listener_get (u32 conn_index)
172 return pool_elt_at_index (udp_main.listener_pool, conn_index);
175 always_inline udp_main_t *
181 always_inline udp_connection_t *
182 udp_get_connection_from_transport (transport_connection_t * tc)
184 return ((udp_connection_t *) tc);
188 udp_connection_index (udp_connection_t * uc)
190 return (uc - udp_main.connections[uc->c_thread_index]);
193 udp_connection_t *udp_connection_alloc (u32 thread_index);
196 * Acquires a lock that blocks a connection pool from expanding.
199 udp_pool_add_peeker (u32 thread_index)
201 if (thread_index != vlib_get_thread_index ())
203 clib_spinlock_lock_if_init (&udp_main.peekers_readers_locks[thread_index]);
204 udp_main.connection_peekers[thread_index] += 1;
205 if (udp_main.connection_peekers[thread_index] == 1)
206 clib_spinlock_lock_if_init (&udp_main.peekers_write_locks[thread_index]);
207 clib_spinlock_unlock_if_init (&udp_main.peekers_readers_locks
212 udp_pool_remove_peeker (u32 thread_index)
214 if (thread_index != vlib_get_thread_index ())
216 ASSERT (udp_main.connection_peekers[thread_index] > 0);
217 clib_spinlock_lock_if_init (&udp_main.peekers_readers_locks[thread_index]);
218 udp_main.connection_peekers[thread_index] -= 1;
219 if (udp_main.connection_peekers[thread_index] == 0)
220 clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks
222 clib_spinlock_unlock_if_init (&udp_main.peekers_readers_locks
226 always_inline udp_connection_t *
227 udp_connection_clone_safe (u32 connection_index, u32 thread_index)
229 udp_connection_t *old_c, *new_c;
230 u32 current_thread_index = vlib_get_thread_index ();
231 new_c = udp_connection_alloc (current_thread_index);
233 /* If during the memcpy pool is reallocated AND the memory allocator
234 * decides to give the old chunk of memory to somebody in a hurry to
235 * scribble something on it, we have a problem. So add this thread as
236 * a session pool peeker.
238 udp_pool_add_peeker (thread_index);
239 old_c = udp_main.connections[thread_index] + connection_index;
240 clib_memcpy_fast (new_c, old_c, sizeof (*new_c));
241 udp_pool_remove_peeker (thread_index);
242 new_c->c_thread_index = current_thread_index;
243 new_c->c_c_index = udp_connection_index (new_c);
244 new_c->c_fib_index = old_c->c_fib_index;
249 always_inline udp_dst_port_info_t *
250 udp_get_dst_port_info (udp_main_t * um, udp_dst_port_t dst_port, u8 is_ip4)
252 uword *p = hash_get (um->dst_port_info_by_dst_port[is_ip4], dst_port);
253 return p ? vec_elt_at_index (um->dst_port_infos[is_ip4], p[0]) : 0;
256 format_function_t format_udp_header;
257 format_function_t format_udp_rx_trace;
258 unformat_function_t unformat_udp_header;
260 void udp_register_dst_port (vlib_main_t * vm,
261 udp_dst_port_t dst_port,
262 u32 node_index, u8 is_ip4);
263 void udp_unregister_dst_port (vlib_main_t * vm,
264 udp_dst_port_t dst_port, u8 is_ip4);
265 bool udp_is_valid_dst_port (udp_dst_port_t dst_port, u8 is_ip4);
267 void udp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
270 vlib_buffer_push_udp (vlib_buffer_t * b, u16 sp, u16 dp, u8 offload_csum)
273 u16 udp_len = sizeof (udp_header_t) + b->current_length;
274 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
275 udp_len += b->total_length_not_including_first_buffer;
277 uh = vlib_buffer_push_uninit (b, sizeof (udp_header_t));
281 uh->length = clib_host_to_net_u16 (udp_len);
284 b->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
285 vnet_buffer (b)->l4_hdr_offset = (u8 *) uh - b->data;
291 ip_udp_fixup_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 is_ip4)
302 ip0 = vlib_buffer_get_current (b0);
304 /* fix the <bleep>ing outer-IP checksum */
305 sum0 = ip0->checksum;
306 /* old_l0 always 0, see the rewrite setup */
307 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
309 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
310 length /* changed member */ );
311 ip0->checksum = ip_csum_fold (sum0);
312 ip0->length = new_l0;
315 udp0 = (udp_header_t *) (ip0 + 1);
316 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
318 udp0->length = new_l0;
325 ip0 = vlib_buffer_get_current (b0);
327 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
329 ip0->payload_length = new_l0;
332 udp0 = (udp_header_t *) (ip0 + 1);
333 udp0->length = new_l0;
336 ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
337 ASSERT (bogus0 == 0);
339 if (udp0->checksum == 0)
340 udp0->checksum = 0xffff;
345 ip_udp_encap_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 * ec0, word ec_len,
348 vlib_buffer_advance (b0, -ec_len);
354 ip0 = vlib_buffer_get_current (b0);
356 /* Apply the encap string. */
357 clib_memcpy_fast (ip0, ec0, ec_len);
358 ip_udp_fixup_one (vm, b0, 1);
364 ip0 = vlib_buffer_get_current (b0);
366 /* Apply the encap string. */
367 clib_memcpy_fast (ip0, ec0, ec_len);
368 ip_udp_fixup_one (vm, b0, 0);
373 ip_udp_encap_two (vlib_main_t * vm, vlib_buffer_t * b0, vlib_buffer_t * b1,
374 u8 * ec0, u8 * ec1, word ec_len, u8 is_v4)
377 udp_header_t *udp0, *udp1;
379 ASSERT (_vec_len (ec0) == _vec_len (ec1));
381 vlib_buffer_advance (b0, -ec_len);
382 vlib_buffer_advance (b1, -ec_len);
386 ip4_header_t *ip0, *ip1;
387 ip_csum_t sum0, sum1;
388 u16 old_l0 = 0, old_l1 = 0;
390 ip0 = vlib_buffer_get_current (b0);
391 ip1 = vlib_buffer_get_current (b1);
393 /* Apply the encap string */
394 clib_memcpy_fast (ip0, ec0, ec_len);
395 clib_memcpy_fast (ip1, ec1, ec_len);
397 /* fix the <bleep>ing outer-IP checksum */
398 sum0 = ip0->checksum;
399 sum1 = ip1->checksum;
401 /* old_l0 always 0, see the rewrite setup */
402 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
403 new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
405 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
406 length /* changed member */ );
407 sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
408 length /* changed member */ );
410 ip0->checksum = ip_csum_fold (sum0);
411 ip1->checksum = ip_csum_fold (sum1);
413 ip0->length = new_l0;
414 ip1->length = new_l1;
417 udp0 = (udp_header_t *) (ip0 + 1);
418 udp1 = (udp_header_t *) (ip1 + 1);
421 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
424 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1) -
426 udp0->length = new_l0;
427 udp1->length = new_l1;
431 ip6_header_t *ip0, *ip1;
434 ip0 = vlib_buffer_get_current (b0);
435 ip1 = vlib_buffer_get_current (b1);
437 /* Apply the encap string. */
438 clib_memcpy_fast (ip0, ec0, ec_len);
439 clib_memcpy_fast (ip1, ec1, ec_len);
441 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
443 new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
445 ip0->payload_length = new_l0;
446 ip1->payload_length = new_l1;
449 udp0 = (udp_header_t *) (ip0 + 1);
450 udp1 = (udp_header_t *) (ip1 + 1);
452 udp0->length = new_l0;
453 udp1->length = new_l1;
456 ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
458 ip6_tcp_udp_icmp_compute_checksum (vm, b1, ip1, &bogus1);
459 ASSERT (bogus0 == 0);
460 ASSERT (bogus1 == 0);
462 if (udp0->checksum == 0)
463 udp0->checksum = 0xffff;
464 if (udp1->checksum == 0)
465 udp1->checksum = 0xffff;
470 * fd.io coding-style-patch-verification: ON
473 * eval: (c-set-style "gnu")
477 #endif /* __included_udp_h__ */