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>
24 #include <sys/types.h>
27 #include <vlib/vlib.h>
28 #include <vlib/unix/unix.h>
29 #include <vnet/ip/ip.h>
30 #include <vnet/ethernet/ethernet.h>
32 #include <vnet/devices/af_packet/af_packet.h>
34 #define AF_PACKET_DEBUG_SOCKET 0
36 #define AF_PACKET_TX_FRAMES_PER_BLOCK 1024
37 #define AF_PACKET_TX_FRAME_SIZE (2048 * 5)
38 #define AF_PACKET_TX_BLOCK_NR 1
39 #define AF_PACKET_TX_FRAME_NR (AF_PACKET_TX_BLOCK_NR * \
40 AF_PACKET_TX_FRAMES_PER_BLOCK)
41 #define AF_PACKET_TX_BLOCK_SIZE (AF_PACKET_TX_FRAME_SIZE * \
42 AF_PACKET_TX_FRAMES_PER_BLOCK)
44 #define AF_PACKET_RX_FRAMES_PER_BLOCK 1024
45 #define AF_PACKET_RX_FRAME_SIZE (2048 * 5)
46 #define AF_PACKET_RX_BLOCK_NR 1
47 #define AF_PACKET_RX_FRAME_NR (AF_PACKET_RX_BLOCK_NR * \
48 AF_PACKET_RX_FRAMES_PER_BLOCK)
49 #define AF_PACKET_RX_BLOCK_SIZE (AF_PACKET_RX_FRAME_SIZE * \
50 AF_PACKET_RX_FRAMES_PER_BLOCK)
52 #if AF_PACKET_DEBUG_SOCKET == 1
53 #define DBG_SOCK(args...) clib_warning(args);
55 #define DBG_SOCK(args...)
58 /*defined in net/if.h but clashes with dpdk headers */
59 unsigned int if_nametoindex (const char *ifname);
61 typedef struct tpacket_req tpacket_req_t;
64 af_packet_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
69 af_packet_main_t *apm = &af_packet_main;
70 af_packet_if_t *apif =
71 pool_elt_at_index (apm->interfaces, hi->dev_instance);
73 if (ETHERNET_INTERFACE_FLAG_MTU == (flags & ETHERNET_INTERFACE_FLAG_MTU))
75 s = format (0, "/sys/class/net/%s/mtu%c", apif->host_if_name, 0);
77 error = vlib_sysfs_write ((char *) s, "%d", hi->max_packet_bytes);
82 clib_error_report (error);
83 return VNET_API_ERROR_SYSCALL_ERROR_1;
91 af_packet_fd_read_ready (unix_file_t * uf)
93 af_packet_main_t *apm = &af_packet_main;
94 vnet_main_t *vnm = vnet_get_main ();
95 u32 idx = uf->private_data;
96 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, idx);
98 apm->pending_input_bitmap =
99 clib_bitmap_set (apm->pending_input_bitmap, idx, 1);
101 /* Schedule the rx node */
102 vnet_device_input_set_interrupt_pending (vnm, apif->hw_if_index, 0);
108 is_bridge (const u8 * host_if_name)
113 s = format (0, "/sys/class/net/%s/bridge%c", host_if_name, 0);
114 dir = opendir ((char *) s);
127 create_packet_v2_sock (int host_if_index, tpacket_req_t * rx_req,
128 tpacket_req_t * tx_req, int *fd, u8 ** ring)
131 struct sockaddr_ll sll;
132 int ver = TPACKET_V2;
133 socklen_t req_sz = sizeof (struct tpacket_req);
134 u32 ring_sz = rx_req->tp_block_size * rx_req->tp_block_nr +
135 tx_req->tp_block_size * tx_req->tp_block_nr;
137 if ((*fd = socket (AF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0)
139 DBG_SOCK ("Failed to create socket");
140 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
145 setsockopt (*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof (ver))) < 0)
147 DBG_SOCK ("Failed to set rx packet interface version");
148 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
154 setsockopt (*fd, SOL_PACKET, PACKET_LOSS, &opt, sizeof (opt))) < 0)
156 DBG_SOCK ("Failed to set packet tx ring error handling option");
157 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
162 setsockopt (*fd, SOL_PACKET, PACKET_RX_RING, rx_req, req_sz)) < 0)
164 DBG_SOCK ("Failed to set packet rx ring options");
165 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
170 setsockopt (*fd, SOL_PACKET, PACKET_TX_RING, tx_req, req_sz)) < 0)
172 DBG_SOCK ("Failed to set packet rx ring options");
173 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
178 mmap (NULL, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, *fd,
180 if (*ring == MAP_FAILED)
182 DBG_SOCK ("mmap failure");
183 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
187 memset (&sll, 0, sizeof (sll));
188 sll.sll_family = PF_PACKET;
189 sll.sll_protocol = htons (ETH_P_ALL);
190 sll.sll_ifindex = host_if_index;
192 if ((err = bind (*fd, (struct sockaddr *) &sll, sizeof (sll))) < 0)
194 DBG_SOCK ("Failed to bind rx packet socket (error %d)", err);
195 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
208 af_packet_create_if (vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set,
211 af_packet_main_t *apm = &af_packet_main;
213 struct tpacket_req *rx_req = 0;
214 struct tpacket_req *tx_req = 0;
216 af_packet_if_t *apif = 0;
219 vnet_sw_interface_t *sw;
220 vnet_hw_interface_t *hw;
221 vlib_thread_main_t *tm = vlib_get_thread_main ();
222 vnet_main_t *vnm = vnet_get_main ();
225 u8 *host_if_name_dup = vec_dup (host_if_name);
226 int host_if_index = -1;
228 p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
231 return VNET_API_ERROR_SUBIF_ALREADY_EXISTS;
234 vec_validate (rx_req, 0);
235 rx_req->tp_block_size = AF_PACKET_RX_BLOCK_SIZE;
236 rx_req->tp_frame_size = AF_PACKET_RX_FRAME_SIZE;
237 rx_req->tp_block_nr = AF_PACKET_RX_BLOCK_NR;
238 rx_req->tp_frame_nr = AF_PACKET_RX_FRAME_NR;
240 vec_validate (tx_req, 0);
241 tx_req->tp_block_size = AF_PACKET_TX_BLOCK_SIZE;
242 tx_req->tp_frame_size = AF_PACKET_TX_FRAME_SIZE;
243 tx_req->tp_block_nr = AF_PACKET_TX_BLOCK_NR;
244 tx_req->tp_frame_nr = AF_PACKET_TX_FRAME_NR;
246 host_if_index = if_nametoindex ((const char *) host_if_name);
250 DBG_SOCK ("Wrong host interface name");
251 return VNET_API_ERROR_INVALID_INTERFACE;
254 ret = create_packet_v2_sock (host_if_index, rx_req, tx_req, &fd, &ring);
259 ret = is_bridge (host_if_name);
261 if (ret == 0) /* is a bridge, ignore state */
264 /* So far everything looks good, let's create interface */
265 pool_get (apm->interfaces, apif);
266 if_index = apif - apm->interfaces;
268 apif->host_if_index = host_if_index;
270 apif->rx_ring = ring;
271 apif->tx_ring = ring + rx_req->tp_block_size * rx_req->tp_block_nr;
272 apif->rx_req = rx_req;
273 apif->tx_req = tx_req;
274 apif->host_if_name = host_if_name_dup;
275 apif->per_interface_next_index = ~0;
276 apif->next_tx_frame = 0;
277 apif->next_rx_frame = 0;
279 if (tm->n_vlib_mains > 1)
280 clib_spinlock_init (&apif->lockp);
283 unix_file_t template = { 0 };
284 template.read_function = af_packet_fd_read_ready;
285 template.file_descriptor = fd;
286 template.private_data = if_index;
287 template.flags = UNIX_FILE_EVENT_EDGE_TRIGGERED;
288 apif->unix_file_index = unix_file_add (&unix_main, &template);
291 /*use configured or generate random MAC address */
293 clib_memcpy (hw_addr, hw_addr_set, 6);
296 f64 now = vlib_time_now (vm);
298 rnd = (u32) (now * 1e6);
299 rnd = random_u32 (&rnd);
301 clib_memcpy (hw_addr + 2, &rnd, sizeof (rnd));
306 error = ethernet_register_interface (vnm, af_packet_device_class.index,
307 if_index, hw_addr, &apif->hw_if_index,
308 af_packet_eth_flag_change);
312 memset (apif, 0, sizeof (*apif));
313 pool_put (apm->interfaces, apif);
314 clib_error_report (error);
315 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
319 sw = vnet_get_hw_sw_interface (vnm, apif->hw_if_index);
320 hw = vnet_get_hw_interface (vnm, apif->hw_if_index);
321 apif->sw_if_index = sw->sw_if_index;
322 vnet_hw_interface_set_input_node (vnm, apif->hw_if_index,
323 af_packet_input_node.index);
325 vnet_hw_interface_assign_rx_thread (vnm, apif->hw_if_index, 0, /* queue */
328 hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
329 vnet_hw_interface_set_flags (vnm, apif->hw_if_index,
330 VNET_HW_INTERFACE_FLAG_LINK_UP);
332 vnet_hw_interface_set_rx_mode (vnm, apif->hw_if_index, 0,
333 VNET_HW_INTERFACE_RX_MODE_INTERRUPT);
335 mhash_set_mem (&apm->if_index_by_host_if_name, host_if_name_dup, &if_index,
338 *sw_if_index = apif->sw_if_index;
343 vec_free (host_if_name_dup);
350 af_packet_delete_if (vlib_main_t * vm, u8 * host_if_name)
352 vnet_main_t *vnm = vnet_get_main ();
353 af_packet_main_t *apm = &af_packet_main;
354 af_packet_if_t *apif;
359 p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
362 clib_warning ("Host interface %s does not exist", host_if_name);
363 return VNET_API_ERROR_SYSCALL_ERROR_1;
365 apif = pool_elt_at_index (apm->interfaces, p[0]);
366 if_index = apif - apm->interfaces;
368 /* bring down the interface */
369 vnet_hw_interface_set_flags (vnm, apif->hw_if_index, 0);
370 vnet_hw_interface_unassign_rx_thread (vnm, apif->hw_if_index, 0);
373 if (apif->unix_file_index != ~0)
375 unix_file_del (&unix_main, unix_main.file_pool + apif->unix_file_index);
376 apif->unix_file_index = ~0;
381 ring_sz = apif->rx_req->tp_block_size * apif->rx_req->tp_block_nr +
382 apif->tx_req->tp_block_size * apif->tx_req->tp_block_nr;
383 if (munmap (apif->rx_ring, ring_sz))
384 clib_warning ("Host interface %s could not free rx/tx ring",
386 apif->rx_ring = NULL;
387 apif->tx_ring = NULL;
390 vec_free (apif->rx_req);
392 vec_free (apif->tx_req);
395 vec_free (apif->host_if_name);
396 apif->host_if_name = NULL;
397 apif->host_if_index = -1;
399 mhash_unset (&apm->if_index_by_host_if_name, host_if_name, &if_index);
401 ethernet_delete_interface (vnm, apif->hw_if_index);
403 pool_put (apm->interfaces, apif);
408 static clib_error_t *
409 af_packet_init (vlib_main_t * vm)
411 af_packet_main_t *apm = &af_packet_main;
412 vlib_thread_main_t *tm = vlib_get_thread_main ();
414 memset (apm, 0, sizeof (af_packet_main_t));
416 mhash_init_vec_string (&apm->if_index_by_host_if_name, sizeof (uword));
418 vec_validate_aligned (apm->rx_buffers, tm->n_vlib_mains - 1,
419 CLIB_CACHE_LINE_BYTES);
424 VLIB_INIT_FUNCTION (af_packet_init);
427 * fd.io coding-style-patch-verification: ON
430 * eval: (c-set-style "gnu")