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/ethernet/ethernet.h>
35 #include <vnet/devices/af_packet/af_packet.h>
37 af_packet_main_t af_packet_main;
39 #define AF_PACKET_DEBUG_SOCKET 0
41 #define AF_PACKET_TX_FRAMES_PER_BLOCK 1024
42 #define AF_PACKET_TX_FRAME_SIZE (2048 * 5)
43 #define AF_PACKET_TX_BLOCK_NR 1
44 #define AF_PACKET_TX_FRAME_NR (AF_PACKET_TX_BLOCK_NR * \
45 AF_PACKET_TX_FRAMES_PER_BLOCK)
46 #define AF_PACKET_TX_BLOCK_SIZE (AF_PACKET_TX_FRAME_SIZE * \
47 AF_PACKET_TX_FRAMES_PER_BLOCK)
49 #define AF_PACKET_RX_FRAMES_PER_BLOCK 1024
50 #define AF_PACKET_RX_FRAME_SIZE (2048 * 5)
51 #define AF_PACKET_RX_BLOCK_NR 1
52 #define AF_PACKET_RX_FRAME_NR (AF_PACKET_RX_BLOCK_NR * \
53 AF_PACKET_RX_FRAMES_PER_BLOCK)
54 #define AF_PACKET_RX_BLOCK_SIZE (AF_PACKET_RX_FRAME_SIZE * \
55 AF_PACKET_RX_FRAMES_PER_BLOCK)
57 #if AF_PACKET_DEBUG_SOCKET == 1
58 #define DBG_SOCK(args...) clib_warning(args);
60 #define DBG_SOCK(args...)
63 /*defined in net/if.h but clashes with dpdk headers */
64 unsigned int if_nametoindex (const char *ifname);
66 typedef struct tpacket_req tpacket_req_t;
69 af_packet_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
74 af_packet_main_t *apm = &af_packet_main;
75 af_packet_if_t *apif =
76 pool_elt_at_index (apm->interfaces, hi->dev_instance);
78 if (ETHERNET_INTERFACE_FLAG_MTU == (flags & ETHERNET_INTERFACE_FLAG_MTU))
80 s = format (0, "/sys/class/net/%s/mtu%c", apif->host_if_name, 0);
82 error = clib_sysfs_write ((char *) s, "%d", hi->max_packet_bytes);
87 clib_error_report (error);
88 return VNET_API_ERROR_SYSCALL_ERROR_1;
96 af_packet_fd_read_ready (clib_file_t * uf)
98 af_packet_main_t *apm = &af_packet_main;
99 vnet_main_t *vnm = vnet_get_main ();
100 u32 idx = uf->private_data;
101 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, idx);
103 apm->pending_input_bitmap =
104 clib_bitmap_set (apm->pending_input_bitmap, idx, 1);
106 /* Schedule the rx node */
107 vnet_device_input_set_interrupt_pending (vnm, apif->hw_if_index, 0);
113 is_bridge (const u8 * host_if_name)
118 s = format (0, "/sys/class/net/%s/bridge%c", host_if_name, 0);
119 dir = opendir ((char *) s);
132 create_packet_v2_sock (int host_if_index, tpacket_req_t * rx_req,
133 tpacket_req_t * tx_req, int *fd, u8 ** ring)
136 struct sockaddr_ll sll;
137 int ver = TPACKET_V2;
138 socklen_t req_sz = sizeof (struct tpacket_req);
139 u32 ring_sz = rx_req->tp_block_size * rx_req->tp_block_nr +
140 tx_req->tp_block_size * tx_req->tp_block_nr;
142 if ((*fd = socket (AF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0)
144 DBG_SOCK ("Failed to create socket");
145 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
149 /* bind before rx ring is cfged so we don't receive packets from other interfaces */
150 memset (&sll, 0, sizeof (sll));
151 sll.sll_family = PF_PACKET;
152 sll.sll_protocol = htons (ETH_P_ALL);
153 sll.sll_ifindex = host_if_index;
154 if ((err = bind (*fd, (struct sockaddr *) &sll, sizeof (sll))) < 0)
156 DBG_SOCK ("Failed to bind rx packet socket (error %d)", err);
157 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
162 setsockopt (*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof (ver))) < 0)
164 DBG_SOCK ("Failed to set rx packet interface version");
165 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
171 setsockopt (*fd, SOL_PACKET, PACKET_LOSS, &opt, sizeof (opt))) < 0)
173 DBG_SOCK ("Failed to set packet tx ring error handling option");
174 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
179 setsockopt (*fd, SOL_PACKET, PACKET_RX_RING, rx_req, req_sz)) < 0)
181 DBG_SOCK ("Failed to set packet rx ring options");
182 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
187 setsockopt (*fd, SOL_PACKET, PACKET_TX_RING, tx_req, req_sz)) < 0)
189 DBG_SOCK ("Failed to set packet tx ring options");
190 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
195 mmap (NULL, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, *fd,
197 if (*ring == MAP_FAILED)
199 DBG_SOCK ("mmap failure");
200 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
213 af_packet_create_if (vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set,
216 af_packet_main_t *apm = &af_packet_main;
217 int ret, fd = -1, fd2 = -1;
218 struct tpacket_req *rx_req = 0;
219 struct tpacket_req *tx_req = 0;
222 af_packet_if_t *apif = 0;
225 vnet_sw_interface_t *sw;
226 vnet_hw_interface_t *hw;
227 vlib_thread_main_t *tm = vlib_get_thread_main ();
228 vnet_main_t *vnm = vnet_get_main ();
231 u8 *host_if_name_dup = vec_dup (host_if_name);
232 int host_if_index = -1;
234 p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
237 apif = vec_elt_at_index (apm->interfaces, p[0]);
238 *sw_if_index = apif->sw_if_index;
239 return VNET_API_ERROR_IF_ALREADY_EXISTS;
242 vec_validate (rx_req, 0);
243 rx_req->tp_block_size = AF_PACKET_RX_BLOCK_SIZE;
244 rx_req->tp_frame_size = AF_PACKET_RX_FRAME_SIZE;
245 rx_req->tp_block_nr = AF_PACKET_RX_BLOCK_NR;
246 rx_req->tp_frame_nr = AF_PACKET_RX_FRAME_NR;
248 vec_validate (tx_req, 0);
249 tx_req->tp_block_size = AF_PACKET_TX_BLOCK_SIZE;
250 tx_req->tp_frame_size = AF_PACKET_TX_FRAME_SIZE;
251 tx_req->tp_block_nr = AF_PACKET_TX_BLOCK_NR;
252 tx_req->tp_frame_nr = AF_PACKET_TX_FRAME_NR;
255 * make sure host side of interface is 'UP' before binding AF_PACKET
258 if ((fd2 = socket (AF_UNIX, SOCK_DGRAM, 0)) < 0)
260 DBG_SOCK ("Failed to create socket");
261 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
265 clib_memcpy (ifr.ifr_name, (const char *) host_if_name,
266 vec_len (host_if_name));
267 if ((ret = ioctl (fd2, SIOCGIFINDEX, &ifr)) < 0)
269 clib_unix_warning ("af_packet_create error: %d", ret);
271 return VNET_API_ERROR_INVALID_INTERFACE;
274 host_if_index = ifr.ifr_ifindex;
275 if ((ret = ioctl (fd2, SIOCGIFFLAGS, &ifr)) < 0)
277 clib_unix_warning ("af_packet_create error: %d", ret);
281 if (!(ifr.ifr_flags & IFF_UP))
283 ifr.ifr_flags |= IFF_UP;
284 if ((ret = ioctl (fd2, SIOCSIFFLAGS, &ifr)) < 0)
286 clib_unix_warning ("af_packet_create error: %d", ret);
294 ret = create_packet_v2_sock (host_if_index, rx_req, tx_req, &fd, &ring);
299 ret = is_bridge (host_if_name);
301 if (ret == 0) /* is a bridge, ignore state */
304 /* So far everything looks good, let's create interface */
305 pool_get (apm->interfaces, apif);
306 if_index = apif - apm->interfaces;
308 apif->host_if_index = host_if_index;
310 apif->rx_ring = ring;
311 apif->tx_ring = ring + rx_req->tp_block_size * rx_req->tp_block_nr;
312 apif->rx_req = rx_req;
313 apif->tx_req = tx_req;
314 apif->host_if_name = host_if_name_dup;
315 apif->per_interface_next_index = ~0;
316 apif->next_tx_frame = 0;
317 apif->next_rx_frame = 0;
319 if (tm->n_vlib_mains > 1)
320 clib_spinlock_init (&apif->lockp);
323 clib_file_t template = { 0 };
324 template.read_function = af_packet_fd_read_ready;
325 template.file_descriptor = fd;
326 template.private_data = if_index;
327 template.flags = UNIX_FILE_EVENT_EDGE_TRIGGERED;
328 template.description = format (0, "%U", format_af_packet_device_name,
330 apif->clib_file_index = clib_file_add (&file_main, &template);
333 /*use configured or generate random MAC address */
335 clib_memcpy (hw_addr, hw_addr_set, 6);
338 f64 now = vlib_time_now (vm);
340 rnd = (u32) (now * 1e6);
341 rnd = random_u32 (&rnd);
343 clib_memcpy (hw_addr + 2, &rnd, sizeof (rnd));
348 error = ethernet_register_interface (vnm, af_packet_device_class.index,
349 if_index, hw_addr, &apif->hw_if_index,
350 af_packet_eth_flag_change);
354 memset (apif, 0, sizeof (*apif));
355 pool_put (apm->interfaces, apif);
356 clib_error_report (error);
357 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
361 sw = vnet_get_hw_sw_interface (vnm, apif->hw_if_index);
362 hw = vnet_get_hw_interface (vnm, apif->hw_if_index);
363 apif->sw_if_index = sw->sw_if_index;
364 vnet_hw_interface_set_input_node (vnm, apif->hw_if_index,
365 af_packet_input_node.index);
367 vnet_hw_interface_assign_rx_thread (vnm, apif->hw_if_index, 0, /* queue */
370 hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
371 vnet_hw_interface_set_flags (vnm, apif->hw_if_index,
372 VNET_HW_INTERFACE_FLAG_LINK_UP);
374 vnet_hw_interface_set_rx_mode (vnm, apif->hw_if_index, 0,
375 VNET_HW_INTERFACE_RX_MODE_INTERRUPT);
377 mhash_set_mem (&apm->if_index_by_host_if_name, host_if_name_dup, &if_index,
380 *sw_if_index = apif->sw_if_index;
387 vec_free (host_if_name_dup);
394 af_packet_delete_if (vlib_main_t * vm, u8 * host_if_name)
396 vnet_main_t *vnm = vnet_get_main ();
397 af_packet_main_t *apm = &af_packet_main;
398 af_packet_if_t *apif;
403 p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
406 clib_warning ("Host interface %s does not exist", host_if_name);
407 return VNET_API_ERROR_SYSCALL_ERROR_1;
409 apif = pool_elt_at_index (apm->interfaces, p[0]);
410 if_index = apif - apm->interfaces;
412 /* bring down the interface */
413 vnet_hw_interface_set_flags (vnm, apif->hw_if_index, 0);
414 vnet_hw_interface_unassign_rx_thread (vnm, apif->hw_if_index, 0);
417 if (apif->clib_file_index != ~0)
419 clib_file_del (&file_main, file_main.file_pool + apif->clib_file_index);
420 apif->clib_file_index = ~0;
425 ring_sz = apif->rx_req->tp_block_size * apif->rx_req->tp_block_nr +
426 apif->tx_req->tp_block_size * apif->tx_req->tp_block_nr;
427 if (munmap (apif->rx_ring, ring_sz))
428 clib_warning ("Host interface %s could not free rx/tx ring",
430 apif->rx_ring = NULL;
431 apif->tx_ring = NULL;
434 vec_free (apif->rx_req);
436 vec_free (apif->tx_req);
439 vec_free (apif->host_if_name);
440 apif->host_if_name = NULL;
441 apif->host_if_index = -1;
443 mhash_unset (&apm->if_index_by_host_if_name, host_if_name, &if_index);
445 ethernet_delete_interface (vnm, apif->hw_if_index);
447 pool_put (apm->interfaces, apif);
453 af_packet_set_l4_cksum_offload (vlib_main_t * vm, u32 sw_if_index, u8 set)
455 vnet_main_t *vnm = vnet_get_main ();
456 vnet_hw_interface_t *hw;
458 hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
460 if (hw->dev_class_index != af_packet_device_class.index)
461 return VNET_API_ERROR_INVALID_INTERFACE;
464 hw->flags &= ~VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD;
466 hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD;
471 static clib_error_t *
472 af_packet_init (vlib_main_t * vm)
474 af_packet_main_t *apm = &af_packet_main;
475 vlib_thread_main_t *tm = vlib_get_thread_main ();
477 memset (apm, 0, sizeof (af_packet_main_t));
479 mhash_init_vec_string (&apm->if_index_by_host_if_name, sizeof (uword));
481 vec_validate_aligned (apm->rx_buffers, tm->n_vlib_mains - 1,
482 CLIB_CACHE_LINE_BYTES);
487 VLIB_INIT_FUNCTION (af_packet_init);
490 * fd.io coding-style-patch-verification: ON
493 * eval: (c-set-style "gnu")