2 *------------------------------------------------------------------
3 * af_packet.c - linux kernel packet interface
5 * Copyright (c) 2016 Cisco and/or its affiliates.
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at:
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *------------------------------------------------------------------
20 #include <linux/if_ether.h>
21 #include <linux/if_packet.h>
22 #include <sys/ioctl.h>
26 #include <sys/types.h>
29 #include <vppinfra/linux/sysfs.h>
30 #include <vlib/vlib.h>
31 #include <vlib/unix/unix.h>
32 #include <vnet/ip/ip.h>
33 #include <vnet/devices/netlink.h>
34 #include <vnet/ethernet/ethernet.h>
35 #include <vnet/interface/rx_queue_funcs.h>
37 #include <vnet/devices/af_packet/af_packet.h>
39 af_packet_main_t af_packet_main;
41 VNET_HW_INTERFACE_CLASS (af_packet_ip_device_hw_interface_class, static) = {
42 .name = "af-packet-ip-device",
43 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
46 #define AF_PACKET_DEFAULT_TX_FRAMES_PER_BLOCK 1024
47 #define AF_PACKET_DEFAULT_TX_FRAME_SIZE (2048 * 5)
48 #define AF_PACKET_TX_BLOCK_NR 1
50 #define AF_PACKET_DEFAULT_RX_FRAMES_PER_BLOCK 1024
51 #define AF_PACKET_DEFAULT_RX_FRAME_SIZE (2048 * 5)
52 #define AF_PACKET_RX_BLOCK_NR 1
54 /*defined in net/if.h but clashes with dpdk headers */
55 unsigned int if_nametoindex (const char *ifname);
57 typedef struct tpacket_req tpacket_req_t;
60 af_packet_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
64 af_packet_main_t *apm = &af_packet_main;
65 af_packet_if_t *apif =
66 pool_elt_at_index (apm->interfaces, hi->dev_instance);
68 if (flags == ETHERNET_INTERFACE_FLAG_MTU)
71 vnet_netlink_set_link_mtu (apif->host_if_index, hi->max_packet_bytes);
75 vlib_log_err (apm->log_class, "netlink failed to change MTU: %U",
76 format_clib_error, error);
77 clib_error_free (error);
78 return VNET_API_ERROR_SYSCALL_ERROR_1;
81 apif->host_mtu = hi->max_packet_bytes;
88 af_packet_read_mtu (af_packet_if_t *apif)
90 af_packet_main_t *apm = &af_packet_main;
92 error = vnet_netlink_get_link_mtu (apif->host_if_index, &apif->host_mtu);
95 vlib_log_err (apm->log_class, "netlink failed to get MTU: %U",
96 format_clib_error, error);
97 clib_error_free (error);
98 return VNET_API_ERROR_SYSCALL_ERROR_1;
103 static clib_error_t *
104 af_packet_fd_read_ready (clib_file_t * uf)
106 af_packet_main_t *apm = &af_packet_main;
107 vnet_main_t *vnm = vnet_get_main ();
108 u32 idx = uf->private_data;
109 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, idx);
111 apm->pending_input_bitmap =
112 clib_bitmap_set (apm->pending_input_bitmap, idx, 1);
114 /* Schedule the rx node */
115 vnet_hw_if_rx_queue_set_int_pending (vnm, apif->queue_index);
120 is_bridge (const u8 * host_if_name)
125 s = format (0, "/sys/class/net/%s/bridge%c", host_if_name, 0);
126 dir = opendir ((char *) s);
139 create_packet_v2_sock (int host_if_index, tpacket_req_t * rx_req,
140 tpacket_req_t * tx_req, int *fd, u8 ** ring)
142 af_packet_main_t *apm = &af_packet_main;
144 struct sockaddr_ll sll;
145 int ver = TPACKET_V2;
146 socklen_t req_sz = sizeof (struct tpacket_req);
147 u32 ring_sz = rx_req->tp_block_size * rx_req->tp_block_nr +
148 tx_req->tp_block_size * tx_req->tp_block_nr;
150 if ((*fd = socket (AF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0)
152 vlib_log_debug (apm->log_class,
153 "Failed to create AF_PACKET socket: %s (errno %d)",
154 strerror (errno), errno);
155 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
159 /* bind before rx ring is cfged so we don't receive packets from other interfaces */
160 clib_memset (&sll, 0, sizeof (sll));
161 sll.sll_family = PF_PACKET;
162 sll.sll_protocol = htons (ETH_P_ALL);
163 sll.sll_ifindex = host_if_index;
164 if (bind (*fd, (struct sockaddr *) &sll, sizeof (sll)) < 0)
166 vlib_log_debug (apm->log_class,
167 "Failed to bind rx packet socket: %s (errno %d)",
168 strerror (errno), errno);
169 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
173 if (setsockopt (*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof (ver)) < 0)
175 vlib_log_debug (apm->log_class,
176 "Failed to set rx packet interface version: %s (errno %d)",
177 strerror (errno), errno);
178 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
183 if (setsockopt (*fd, SOL_PACKET, PACKET_LOSS, &opt, sizeof (opt)) < 0)
185 vlib_log_debug (apm->log_class,
186 "Failed to set packet tx ring error handling option: %s (errno %d)",
187 strerror (errno), errno);
188 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
192 #if defined(PACKET_QDISC_BYPASS)
193 /* Introduced with Linux 3.14 so the ifdef should eventually be removed */
194 if (setsockopt (*fd, SOL_PACKET, PACKET_QDISC_BYPASS, &opt, sizeof (opt)) <
197 vlib_log_debug (apm->log_class,
198 "Failed to set qdisc bypass error "
199 "handling option: %s (errno %d)",
200 strerror (errno), errno);
204 if (setsockopt (*fd, SOL_PACKET, PACKET_RX_RING, rx_req, req_sz) < 0)
206 vlib_log_debug (apm->log_class,
207 "Failed to set packet rx ring options: %s (errno %d)",
208 strerror (errno), errno);
209 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
213 if (setsockopt (*fd, SOL_PACKET, PACKET_TX_RING, tx_req, req_sz) < 0)
215 vlib_log_debug (apm->log_class,
216 "Failed to set packet tx ring options: %s (errno %d)",
217 strerror (errno), errno);
218 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
223 mmap (NULL, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, *fd,
225 if (*ring == MAP_FAILED)
227 vlib_log_debug (apm->log_class, "mmap failure: %s (errno %d)",
228 strerror (errno), errno);
229 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
244 af_packet_create_if (af_packet_create_if_arg_t *arg)
246 af_packet_main_t *apm = &af_packet_main;
247 vlib_main_t *vm = vlib_get_main ();
248 int ret, fd = -1, fd2 = -1;
249 struct tpacket_req *rx_req = 0;
250 struct tpacket_req *tx_req = 0;
253 af_packet_if_t *apif = 0;
255 vnet_sw_interface_t *sw;
256 vnet_hw_interface_t *hw;
257 vlib_thread_main_t *tm = vlib_get_thread_main ();
258 vnet_main_t *vnm = vnet_get_main ();
261 u8 *host_if_name_dup = 0;
262 int host_if_index = -1;
263 u32 rx_frames_per_block, tx_frames_per_block;
264 u32 rx_frame_size, tx_frame_size;
266 p = mhash_get (&apm->if_index_by_host_if_name, arg->host_if_name);
269 apif = vec_elt_at_index (apm->interfaces, p[0]);
270 arg->sw_if_index = apif->sw_if_index;
271 return VNET_API_ERROR_IF_ALREADY_EXISTS;
274 host_if_name_dup = vec_dup (arg->host_if_name);
276 rx_frames_per_block = arg->rx_frames_per_block ?
277 arg->rx_frames_per_block :
278 AF_PACKET_DEFAULT_RX_FRAMES_PER_BLOCK;
279 tx_frames_per_block = arg->tx_frames_per_block ?
280 arg->tx_frames_per_block :
281 AF_PACKET_DEFAULT_TX_FRAMES_PER_BLOCK;
283 arg->rx_frame_size ? arg->rx_frame_size : AF_PACKET_DEFAULT_RX_FRAME_SIZE;
285 arg->tx_frame_size ? arg->tx_frame_size : AF_PACKET_DEFAULT_TX_FRAME_SIZE;
287 vec_validate (rx_req, 0);
288 rx_req->tp_block_size = rx_frame_size * rx_frames_per_block;
289 rx_req->tp_frame_size = rx_frame_size;
290 rx_req->tp_block_nr = AF_PACKET_RX_BLOCK_NR;
291 rx_req->tp_frame_nr = AF_PACKET_RX_BLOCK_NR * rx_frames_per_block;
293 vec_validate (tx_req, 0);
294 tx_req->tp_block_size = tx_frame_size * tx_frames_per_block;
295 tx_req->tp_frame_size = tx_frame_size;
296 tx_req->tp_block_nr = AF_PACKET_TX_BLOCK_NR;
297 tx_req->tp_frame_nr = AF_PACKET_TX_BLOCK_NR * tx_frames_per_block;
300 * make sure host side of interface is 'UP' before binding AF_PACKET
303 if ((fd2 = socket (AF_UNIX, SOCK_DGRAM, 0)) < 0)
305 vlib_log_debug (apm->log_class,
306 "Failed to create AF_UNIX socket: %s (errno %d)",
307 strerror (errno), errno);
308 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
312 clib_memcpy (ifr.ifr_name, (const char *) arg->host_if_name,
313 vec_len (arg->host_if_name));
314 if (ioctl (fd2, SIOCGIFINDEX, &ifr) < 0)
318 "Failed to retrieve the interface (%s) index: %s (errno %d)",
319 arg->host_if_name, strerror (errno), errno);
320 ret = VNET_API_ERROR_INVALID_INTERFACE;
324 host_if_index = ifr.ifr_ifindex;
325 if (ioctl (fd2, SIOCGIFFLAGS, &ifr) < 0)
327 vlib_log_debug (apm->log_class,
328 "Failed to get the active flag: %s (errno %d)",
329 strerror (errno), errno);
330 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
334 if (!(ifr.ifr_flags & IFF_UP))
336 ifr.ifr_flags |= IFF_UP;
337 if (ioctl (fd2, SIOCSIFFLAGS, &ifr) < 0)
339 vlib_log_debug (apm->log_class,
340 "Failed to set the active flag: %s (errno %d)",
341 strerror (errno), errno);
342 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
353 ret = create_packet_v2_sock (host_if_index, rx_req, tx_req, &fd, &ring);
358 ret = is_bridge (arg->host_if_name);
360 if (ret == 0) /* is a bridge, ignore state */
363 /* So far everything looks good, let's create interface */
364 pool_get (apm->interfaces, apif);
365 if_index = apif - apm->interfaces;
367 apif->host_if_index = host_if_index;
369 apif->rx_ring = ring;
370 apif->tx_ring = ring + rx_req->tp_block_size * rx_req->tp_block_nr;
371 apif->rx_req = rx_req;
372 apif->tx_req = tx_req;
373 apif->host_if_name = host_if_name_dup;
374 apif->per_interface_next_index = ~0;
375 apif->next_tx_frame = 0;
376 apif->next_rx_frame = 0;
377 apif->mode = arg->mode;
379 ret = af_packet_read_mtu (apif);
383 if (tm->n_vlib_mains > 1)
384 clib_spinlock_init (&apif->lockp);
386 if (apif->mode != AF_PACKET_IF_MODE_IP)
388 vnet_eth_interface_registration_t eir = {};
389 /*use configured or generate random MAC address */
391 clib_memcpy (hw_addr, arg->hw_addr, 6);
394 f64 now = vlib_time_now (vm);
396 rnd = (u32) (now * 1e6);
397 rnd = random_u32 (&rnd);
399 clib_memcpy (hw_addr + 2, &rnd, sizeof (rnd));
404 eir.dev_class_index = af_packet_device_class.index;
405 eir.dev_instance = if_index;
406 eir.address = hw_addr;
407 eir.cb.flag_change = af_packet_eth_flag_change;
408 apif->hw_if_index = vnet_eth_register_interface (vnm, &eir);
412 apif->hw_if_index = vnet_register_interface (
413 vnm, af_packet_device_class.index, if_index,
414 af_packet_ip_device_hw_interface_class.index, if_index);
416 sw = vnet_get_hw_sw_interface (vnm, apif->hw_if_index);
417 hw = vnet_get_hw_interface (vnm, apif->hw_if_index);
418 apif->sw_if_index = sw->sw_if_index;
419 vnet_hw_if_set_input_node (vnm, apif->hw_if_index,
420 af_packet_input_node.index);
421 apif->queue_index = vnet_hw_if_register_rx_queue (vnm, apif->hw_if_index, 0,
422 VNET_HW_IF_RXQ_THREAD_ANY);
424 hw->caps |= VNET_HW_IF_CAP_INT_MODE;
425 vnet_hw_interface_set_flags (vnm, apif->hw_if_index,
426 VNET_HW_INTERFACE_FLAG_LINK_UP);
428 vnet_hw_if_set_rx_queue_mode (vnm, apif->queue_index,
429 VNET_HW_IF_RX_MODE_INTERRUPT);
430 vnet_hw_if_update_runtime_data (vnm, apif->hw_if_index);
432 clib_file_t template = { 0 };
433 template.read_function = af_packet_fd_read_ready;
434 template.file_descriptor = fd;
435 template.private_data = if_index;
436 template.flags = UNIX_FILE_EVENT_EDGE_TRIGGERED;
437 template.description =
438 format (0, "%U", format_af_packet_device_name, if_index);
439 apif->clib_file_index = clib_file_add (&file_main, &template);
441 vnet_hw_if_set_rx_queue_file_index (vnm, apif->queue_index,
442 apif->clib_file_index);
444 mhash_set_mem (&apm->if_index_by_host_if_name, host_if_name_dup, &if_index,
446 arg->sw_if_index = apif->sw_if_index;
456 vec_free (host_if_name_dup);
463 af_packet_delete_if (u8 *host_if_name)
465 vnet_main_t *vnm = vnet_get_main ();
466 af_packet_main_t *apm = &af_packet_main;
467 af_packet_if_t *apif;
472 p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
475 vlib_log_warn (apm->log_class, "Host interface %s does not exist",
477 return VNET_API_ERROR_SYSCALL_ERROR_1;
479 apif = pool_elt_at_index (apm->interfaces, p[0]);
480 if_index = apif - apm->interfaces;
482 /* bring down the interface */
483 vnet_hw_interface_set_flags (vnm, apif->hw_if_index, 0);
486 if (apif->clib_file_index != ~0)
488 clib_file_del (&file_main, file_main.file_pool + apif->clib_file_index);
489 apif->clib_file_index = ~0;
494 ring_sz = apif->rx_req->tp_block_size * apif->rx_req->tp_block_nr +
495 apif->tx_req->tp_block_size * apif->tx_req->tp_block_nr;
496 if (munmap (apif->rx_ring, ring_sz))
497 vlib_log_warn (apm->log_class,
498 "Host interface %s could not free rx/tx ring",
500 apif->rx_ring = NULL;
501 apif->tx_ring = NULL;
504 vec_free (apif->rx_req);
506 vec_free (apif->tx_req);
509 vec_free (apif->host_if_name);
510 apif->host_if_name = NULL;
511 apif->host_if_index = -1;
513 mhash_unset (&apm->if_index_by_host_if_name, host_if_name, &if_index);
515 if (apif->mode != AF_PACKET_IF_MODE_IP)
516 ethernet_delete_interface (vnm, apif->hw_if_index);
518 vnet_delete_hw_interface (vnm, apif->hw_if_index);
520 pool_put (apm->interfaces, apif);
526 af_packet_set_l4_cksum_offload (u32 sw_if_index, u8 set)
528 vnet_main_t *vnm = vnet_get_main ();
529 vnet_hw_interface_t *hw;
531 hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
533 if (hw->dev_class_index != af_packet_device_class.index)
534 return VNET_API_ERROR_INVALID_INTERFACE;
538 hw->caps &= ~(VNET_HW_IF_CAP_TX_TCP_CKSUM | VNET_HW_IF_CAP_TX_UDP_CKSUM);
542 hw->caps |= (VNET_HW_IF_CAP_TX_TCP_CKSUM | VNET_HW_IF_CAP_TX_UDP_CKSUM);
548 af_packet_dump_ifs (af_packet_if_detail_t ** out_af_packet_ifs)
550 af_packet_main_t *apm = &af_packet_main;
551 af_packet_if_t *apif;
552 af_packet_if_detail_t *r_af_packet_ifs = NULL;
553 af_packet_if_detail_t *af_packet_if = NULL;
555 pool_foreach (apif, apm->interfaces)
557 vec_add2 (r_af_packet_ifs, af_packet_if, 1);
558 af_packet_if->sw_if_index = apif->sw_if_index;
559 if (apif->host_if_name)
561 clib_memcpy (af_packet_if->host_if_name, apif->host_if_name,
562 MIN (ARRAY_LEN (af_packet_if->host_if_name) - 1,
563 strlen ((const char *) apif->host_if_name)));
567 *out_af_packet_ifs = r_af_packet_ifs;
572 static clib_error_t *
573 af_packet_init (vlib_main_t * vm)
575 af_packet_main_t *apm = &af_packet_main;
576 vlib_thread_main_t *tm = vlib_get_thread_main ();
578 clib_memset (apm, 0, sizeof (af_packet_main_t));
580 mhash_init_vec_string (&apm->if_index_by_host_if_name, sizeof (uword));
582 vec_validate_aligned (apm->rx_buffers, tm->n_vlib_mains - 1,
583 CLIB_CACHE_LINE_BYTES);
585 apm->log_class = vlib_log_register_class ("af_packet", 0);
586 vlib_log_debug (apm->log_class, "initialized");
591 VLIB_INIT_FUNCTION (af_packet_init);
594 * fd.io coding-style-patch-verification: ON
597 * eval: (c-set-style "gnu")