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_set_max_frame_size (vnet_main_t *vnm, vnet_hw_interface_t *hi,
63 clib_error_t *error, *rv;
64 af_packet_main_t *apm = &af_packet_main;
65 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, hi->dev_instance);
67 error = vnet_netlink_set_link_mtu (apif->host_if_index,
68 frame_size + hi->frame_overhead);
72 vlib_log_err (apm->log_class, "netlink failed to change MTU: %U",
73 format_clib_error, error);
74 rv = vnet_error (VNET_ERR_SYSCALL_ERROR_1, "netlink error: %U",
75 format_clib_error, error);
76 clib_error_free (error);
80 apif->host_mtu = frame_size + hi->frame_overhead;
85 af_packet_read_mtu (af_packet_if_t *apif)
87 af_packet_main_t *apm = &af_packet_main;
89 error = vnet_netlink_get_link_mtu (apif->host_if_index, &apif->host_mtu);
92 vlib_log_err (apm->log_class, "netlink failed to get MTU: %U",
93 format_clib_error, error);
94 clib_error_free (error);
95 return VNET_API_ERROR_SYSCALL_ERROR_1;
100 static clib_error_t *
101 af_packet_fd_read_ready (clib_file_t * uf)
103 af_packet_main_t *apm = &af_packet_main;
104 vnet_main_t *vnm = vnet_get_main ();
105 u32 idx = uf->private_data;
106 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, idx);
108 /* Schedule the rx node */
109 vnet_hw_if_rx_queue_set_int_pending (vnm, apif->queue_index);
114 is_bridge (const u8 * host_if_name)
119 s = format (0, "/sys/class/net/%s/bridge%c", host_if_name, 0);
120 dir = opendir ((char *) s);
133 create_packet_v2_sock (int host_if_index, tpacket_req_t * rx_req,
134 tpacket_req_t * tx_req, int *fd, u8 ** ring)
136 af_packet_main_t *apm = &af_packet_main;
138 struct sockaddr_ll sll;
139 int ver = TPACKET_V2;
140 socklen_t req_sz = sizeof (struct tpacket_req);
141 u32 ring_sz = rx_req->tp_block_size * rx_req->tp_block_nr +
142 tx_req->tp_block_size * tx_req->tp_block_nr;
144 if ((*fd = socket (AF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0)
146 vlib_log_debug (apm->log_class,
147 "Failed to create AF_PACKET socket: %s (errno %d)",
148 strerror (errno), errno);
149 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
153 /* bind before rx ring is cfged so we don't receive packets from other interfaces */
154 clib_memset (&sll, 0, sizeof (sll));
155 sll.sll_family = PF_PACKET;
156 sll.sll_protocol = htons (ETH_P_ALL);
157 sll.sll_ifindex = host_if_index;
158 if (bind (*fd, (struct sockaddr *) &sll, sizeof (sll)) < 0)
160 vlib_log_debug (apm->log_class,
161 "Failed to bind rx packet socket: %s (errno %d)",
162 strerror (errno), errno);
163 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
167 if (setsockopt (*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof (ver)) < 0)
169 vlib_log_debug (apm->log_class,
170 "Failed to set rx packet interface version: %s (errno %d)",
171 strerror (errno), errno);
172 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
177 if (setsockopt (*fd, SOL_PACKET, PACKET_LOSS, &opt, sizeof (opt)) < 0)
179 vlib_log_debug (apm->log_class,
180 "Failed to set packet tx ring error handling option: %s (errno %d)",
181 strerror (errno), errno);
182 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
186 #if defined(PACKET_QDISC_BYPASS)
187 /* Introduced with Linux 3.14 so the ifdef should eventually be removed */
188 if (setsockopt (*fd, SOL_PACKET, PACKET_QDISC_BYPASS, &opt, sizeof (opt)) <
191 vlib_log_debug (apm->log_class,
192 "Failed to set qdisc bypass error "
193 "handling option: %s (errno %d)",
194 strerror (errno), errno);
198 if (setsockopt (*fd, SOL_PACKET, PACKET_RX_RING, rx_req, req_sz) < 0)
200 vlib_log_debug (apm->log_class,
201 "Failed to set packet rx ring options: %s (errno %d)",
202 strerror (errno), errno);
203 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
207 if (setsockopt (*fd, SOL_PACKET, PACKET_TX_RING, tx_req, req_sz) < 0)
209 vlib_log_debug (apm->log_class,
210 "Failed to set packet tx ring options: %s (errno %d)",
211 strerror (errno), errno);
212 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
217 mmap (NULL, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, *fd,
219 if (*ring == MAP_FAILED)
221 vlib_log_debug (apm->log_class, "mmap failure: %s (errno %d)",
222 strerror (errno), errno);
223 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
238 af_packet_create_if (af_packet_create_if_arg_t *arg)
240 af_packet_main_t *apm = &af_packet_main;
241 vlib_main_t *vm = vlib_get_main ();
242 int ret, fd = -1, fd2 = -1;
243 struct tpacket_req *rx_req = 0;
244 struct tpacket_req *tx_req = 0;
247 af_packet_if_t *apif = 0;
249 vnet_sw_interface_t *sw;
250 vlib_thread_main_t *tm = vlib_get_thread_main ();
251 vnet_main_t *vnm = vnet_get_main ();
254 u8 *host_if_name_dup = 0;
255 int host_if_index = -1;
256 u32 rx_frames_per_block, tx_frames_per_block;
257 u32 rx_frame_size, tx_frame_size;
259 p = mhash_get (&apm->if_index_by_host_if_name, arg->host_if_name);
262 apif = vec_elt_at_index (apm->interfaces, p[0]);
263 arg->sw_if_index = apif->sw_if_index;
264 return VNET_API_ERROR_IF_ALREADY_EXISTS;
267 host_if_name_dup = vec_dup (arg->host_if_name);
269 rx_frames_per_block = arg->rx_frames_per_block ?
270 arg->rx_frames_per_block :
271 AF_PACKET_DEFAULT_RX_FRAMES_PER_BLOCK;
272 tx_frames_per_block = arg->tx_frames_per_block ?
273 arg->tx_frames_per_block :
274 AF_PACKET_DEFAULT_TX_FRAMES_PER_BLOCK;
276 arg->rx_frame_size ? arg->rx_frame_size : AF_PACKET_DEFAULT_RX_FRAME_SIZE;
278 arg->tx_frame_size ? arg->tx_frame_size : AF_PACKET_DEFAULT_TX_FRAME_SIZE;
280 vec_validate (rx_req, 0);
281 rx_req->tp_block_size = rx_frame_size * rx_frames_per_block;
282 rx_req->tp_frame_size = rx_frame_size;
283 rx_req->tp_block_nr = AF_PACKET_RX_BLOCK_NR;
284 rx_req->tp_frame_nr = AF_PACKET_RX_BLOCK_NR * rx_frames_per_block;
286 vec_validate (tx_req, 0);
287 tx_req->tp_block_size = tx_frame_size * tx_frames_per_block;
288 tx_req->tp_frame_size = tx_frame_size;
289 tx_req->tp_block_nr = AF_PACKET_TX_BLOCK_NR;
290 tx_req->tp_frame_nr = AF_PACKET_TX_BLOCK_NR * tx_frames_per_block;
293 * make sure host side of interface is 'UP' before binding AF_PACKET
296 if ((fd2 = socket (AF_UNIX, SOCK_DGRAM, 0)) < 0)
298 vlib_log_debug (apm->log_class,
299 "Failed to create AF_UNIX socket: %s (errno %d)",
300 strerror (errno), errno);
301 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
305 clib_memcpy (ifr.ifr_name, (const char *) arg->host_if_name,
306 vec_len (arg->host_if_name));
307 if (ioctl (fd2, SIOCGIFINDEX, &ifr) < 0)
311 "Failed to retrieve the interface (%s) index: %s (errno %d)",
312 arg->host_if_name, strerror (errno), errno);
313 ret = VNET_API_ERROR_INVALID_INTERFACE;
317 host_if_index = ifr.ifr_ifindex;
318 if (ioctl (fd2, SIOCGIFFLAGS, &ifr) < 0)
320 vlib_log_debug (apm->log_class,
321 "Failed to get the active flag: %s (errno %d)",
322 strerror (errno), errno);
323 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
327 if (!(ifr.ifr_flags & IFF_UP))
329 ifr.ifr_flags |= IFF_UP;
330 if (ioctl (fd2, SIOCSIFFLAGS, &ifr) < 0)
332 vlib_log_debug (apm->log_class,
333 "Failed to set the active flag: %s (errno %d)",
334 strerror (errno), errno);
335 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
346 ret = create_packet_v2_sock (host_if_index, rx_req, tx_req, &fd, &ring);
351 ret = is_bridge (arg->host_if_name);
353 if (ret == 0) /* is a bridge, ignore state */
356 /* So far everything looks good, let's create interface */
357 pool_get (apm->interfaces, apif);
358 if_index = apif - apm->interfaces;
360 apif->host_if_index = host_if_index;
362 apif->rx_ring = ring;
363 apif->tx_ring = ring + rx_req->tp_block_size * rx_req->tp_block_nr;
364 apif->rx_req = rx_req;
365 apif->tx_req = tx_req;
366 apif->host_if_name = host_if_name_dup;
367 apif->per_interface_next_index = ~0;
368 apif->next_tx_frame = 0;
369 apif->next_rx_frame = 0;
370 apif->mode = arg->mode;
372 ret = af_packet_read_mtu (apif);
376 if (tm->n_vlib_mains > 1)
377 clib_spinlock_init (&apif->lockp);
379 if (apif->mode != AF_PACKET_IF_MODE_IP)
381 vnet_eth_interface_registration_t eir = {};
382 /*use configured or generate random MAC address */
384 clib_memcpy (hw_addr, arg->hw_addr, 6);
387 f64 now = vlib_time_now (vm);
389 rnd = (u32) (now * 1e6);
390 rnd = random_u32 (&rnd);
392 clib_memcpy (hw_addr + 2, &rnd, sizeof (rnd));
397 eir.dev_class_index = af_packet_device_class.index;
398 eir.dev_instance = if_index;
399 eir.address = hw_addr;
400 eir.cb.set_max_frame_size = af_packet_eth_set_max_frame_size;
401 apif->hw_if_index = vnet_eth_register_interface (vnm, &eir);
405 apif->hw_if_index = vnet_register_interface (
406 vnm, af_packet_device_class.index, if_index,
407 af_packet_ip_device_hw_interface_class.index, if_index);
409 sw = vnet_get_hw_sw_interface (vnm, apif->hw_if_index);
410 apif->sw_if_index = sw->sw_if_index;
411 vnet_hw_if_set_input_node (vnm, apif->hw_if_index,
412 af_packet_input_node.index);
413 apif->queue_index = vnet_hw_if_register_rx_queue (vnm, apif->hw_if_index, 0,
414 VNET_HW_IF_RXQ_THREAD_ANY);
416 vnet_hw_if_set_caps (vnm, apif->hw_if_index, VNET_HW_IF_CAP_INT_MODE);
417 vnet_hw_interface_set_flags (vnm, apif->hw_if_index,
418 VNET_HW_INTERFACE_FLAG_LINK_UP);
420 vnet_hw_if_set_rx_queue_mode (vnm, apif->queue_index,
421 VNET_HW_IF_RX_MODE_INTERRUPT);
422 vnet_hw_if_update_runtime_data (vnm, apif->hw_if_index);
424 clib_file_t template = { 0 };
425 template.read_function = af_packet_fd_read_ready;
426 template.file_descriptor = fd;
427 template.private_data = if_index;
428 template.flags = UNIX_FILE_EVENT_EDGE_TRIGGERED;
429 template.description =
430 format (0, "%U", format_af_packet_device_name, if_index);
431 apif->clib_file_index = clib_file_add (&file_main, &template);
433 vnet_hw_if_set_rx_queue_file_index (vnm, apif->queue_index,
434 apif->clib_file_index);
436 mhash_set_mem (&apm->if_index_by_host_if_name, host_if_name_dup, &if_index,
438 arg->sw_if_index = apif->sw_if_index;
448 vec_free (host_if_name_dup);
455 af_packet_delete_if (u8 *host_if_name)
457 vnet_main_t *vnm = vnet_get_main ();
458 af_packet_main_t *apm = &af_packet_main;
459 af_packet_if_t *apif;
464 p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
467 vlib_log_warn (apm->log_class, "Host interface %s does not exist",
469 return VNET_API_ERROR_SYSCALL_ERROR_1;
471 apif = pool_elt_at_index (apm->interfaces, p[0]);
472 if_index = apif - apm->interfaces;
474 /* bring down the interface */
475 vnet_hw_interface_set_flags (vnm, apif->hw_if_index, 0);
478 if (apif->clib_file_index != ~0)
480 clib_file_del (&file_main, file_main.file_pool + apif->clib_file_index);
481 apif->clib_file_index = ~0;
486 ring_sz = apif->rx_req->tp_block_size * apif->rx_req->tp_block_nr +
487 apif->tx_req->tp_block_size * apif->tx_req->tp_block_nr;
488 if (munmap (apif->rx_ring, ring_sz))
489 vlib_log_warn (apm->log_class,
490 "Host interface %s could not free rx/tx ring",
492 apif->rx_ring = NULL;
493 apif->tx_ring = NULL;
496 vec_free (apif->rx_req);
498 vec_free (apif->tx_req);
501 vec_free (apif->host_if_name);
502 apif->host_if_name = NULL;
503 apif->host_if_index = -1;
505 mhash_unset (&apm->if_index_by_host_if_name, host_if_name, &if_index);
507 if (apif->mode != AF_PACKET_IF_MODE_IP)
508 ethernet_delete_interface (vnm, apif->hw_if_index);
510 vnet_delete_hw_interface (vnm, apif->hw_if_index);
512 pool_put (apm->interfaces, apif);
518 af_packet_set_l4_cksum_offload (u32 sw_if_index, u8 set)
520 vnet_main_t *vnm = vnet_get_main ();
521 vnet_hw_interface_t *hw;
522 vnet_hw_if_caps_t caps =
523 VNET_HW_IF_CAP_TX_TCP_CKSUM | VNET_HW_IF_CAP_TX_UDP_CKSUM;
524 hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
526 if (hw->dev_class_index != af_packet_device_class.index)
527 return VNET_API_ERROR_INVALID_INTERFACE;
530 vnet_hw_if_set_caps (vnm, hw->hw_if_index, caps);
532 vnet_hw_if_unset_caps (vnm, hw->hw_if_index, caps);
538 af_packet_dump_ifs (af_packet_if_detail_t ** out_af_packet_ifs)
540 af_packet_main_t *apm = &af_packet_main;
541 af_packet_if_t *apif;
542 af_packet_if_detail_t *r_af_packet_ifs = NULL;
543 af_packet_if_detail_t *af_packet_if = NULL;
545 pool_foreach (apif, apm->interfaces)
547 vec_add2 (r_af_packet_ifs, af_packet_if, 1);
548 af_packet_if->sw_if_index = apif->sw_if_index;
549 if (apif->host_if_name)
551 clib_memcpy (af_packet_if->host_if_name, apif->host_if_name,
552 MIN (ARRAY_LEN (af_packet_if->host_if_name) - 1,
553 strlen ((const char *) apif->host_if_name)));
557 *out_af_packet_ifs = r_af_packet_ifs;
562 static clib_error_t *
563 af_packet_init (vlib_main_t * vm)
565 af_packet_main_t *apm = &af_packet_main;
566 vlib_thread_main_t *tm = vlib_get_thread_main ();
568 clib_memset (apm, 0, sizeof (af_packet_main_t));
570 mhash_init_vec_string (&apm->if_index_by_host_if_name, sizeof (uword));
572 vec_validate_aligned (apm->rx_buffers, tm->n_vlib_mains - 1,
573 CLIB_CACHE_LINE_BYTES);
575 apm->log_class = vlib_log_register_class ("af_packet", 0);
576 vlib_log_debug (apm->log_class, "initialized");
581 VLIB_INIT_FUNCTION (af_packet_init);
584 * fd.io coding-style-patch-verification: ON
587 * eval: (c-set-style "gnu")