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_packet.h>
21 #include <sys/socket.h>
22 #include <sys/ioctl.h>
24 #include <net/if_arp.h>
26 #include <vlib/vlib.h>
27 #include <vlib/unix/unix.h>
28 #include <vnet/ip/ip.h>
29 #include <vnet/ethernet/ethernet.h>
31 #include <vnet/devices/af_packet/af_packet.h>
33 #define foreach_af_packet_tx_func_error \
34 _(FRAME_NOT_READY, "tx frame not ready") \
35 _(TXRING_EAGAIN, "tx sendto temporary failure") \
36 _(TXRING_FATAL, "tx sendto fatal failure") \
37 _(TXRING_OVERRUN, "tx ring overrun")
41 #define _(f,s) AF_PACKET_TX_ERROR_##f,
42 foreach_af_packet_tx_func_error
45 } af_packet_tx_func_error_t;
47 static char *af_packet_tx_func_error_strings[] = {
49 foreach_af_packet_tx_func_error
54 #ifndef CLIB_MARCH_VARIANT
56 format_af_packet_device_name (u8 * s, va_list * args)
58 u32 i = va_arg (*args, u32);
59 af_packet_main_t *apm = &af_packet_main;
60 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, i);
62 s = format (s, "host-%s", apif->host_if_name);
65 #endif /* CLIB_MARCH_VARIANT */
68 format_af_packet_device (u8 * s, va_list * args)
70 s = format (s, "Linux PACKET socket interface");
75 format_af_packet_tx_trace (u8 * s, va_list * args)
77 s = format (s, "Unimplemented...");
81 VNET_DEVICE_CLASS_TX_FN (af_packet_device_class) (vlib_main_t * vm,
82 vlib_node_runtime_t * node,
85 af_packet_main_t *apm = &af_packet_main;
86 u32 *buffers = vlib_frame_vector_args (frame);
87 u32 n_left = frame->n_vectors;
89 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
90 af_packet_if_t *apif =
91 pool_elt_at_index (apm->interfaces, rd->dev_instance);
92 clib_spinlock_lock_if_init (&apif->lockp);
94 u32 block_size = apif->tx_req->tp_block_size;
95 u32 frame_size = apif->tx_req->tp_frame_size;
96 u32 frame_num = apif->tx_req->tp_frame_nr;
97 u8 *block_start = apif->tx_ring + block * block_size;
98 u32 tx_frame = apif->next_tx_frame;
99 struct tpacket2_hdr *tph;
100 u32 frame_not_ready = 0;
111 tph = (struct tpacket2_hdr *) (block_start + tx_frame * frame_size);
114 (tph->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING)))
122 b0 = vlib_get_buffer (vm, bi);
123 len = b0->current_length;
124 clib_memcpy_fast ((u8 *) tph +
125 TPACKET_ALIGN (sizeof (struct tpacket2_hdr)) +
126 offset, vlib_buffer_get_current (b0), len);
130 (b0->flags & VLIB_BUFFER_NEXT_PRESENT) ? b0->next_buffer : 0));
132 tph->tp_len = tph->tp_snaplen = offset;
133 tph->tp_status = TP_STATUS_SEND_REQUEST;
136 tx_frame = (tx_frame + 1) % frame_num;
138 /* check if we've exhausted the ring */
139 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
143 CLIB_MEMORY_BARRIER ();
145 if (PREDICT_TRUE (n_sent))
147 apif->next_tx_frame = tx_frame;
149 if (PREDICT_FALSE (sendto (apif->fd, NULL, 0,
150 MSG_DONTWAIT, NULL, 0) == -1))
152 /* Uh-oh, drop & move on, but count whether it was fatal or not.
153 * Note that we have no reliable way to properly determine the
154 * disposition of the packets we just enqueued for delivery.
156 vlib_error_count (vm, node->node_index,
157 unix_error_is_fatal (errno) ?
158 AF_PACKET_TX_ERROR_TXRING_FATAL :
159 AF_PACKET_TX_ERROR_TXRING_EAGAIN, n_sent);
163 clib_spinlock_unlock_if_init (&apif->lockp);
165 if (PREDICT_FALSE (frame_not_ready))
166 vlib_error_count (vm, node->node_index,
167 AF_PACKET_TX_ERROR_FRAME_NOT_READY, frame_not_ready);
169 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
170 vlib_error_count (vm, node->node_index, AF_PACKET_TX_ERROR_TXRING_OVERRUN,
173 vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors);
174 return frame->n_vectors;
178 af_packet_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
181 af_packet_main_t *apm = &af_packet_main;
182 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
183 af_packet_if_t *apif =
184 pool_elt_at_index (apm->interfaces, hw->dev_instance);
186 /* Shut off redirection */
187 if (node_index == ~0)
189 apif->per_interface_next_index = node_index;
193 apif->per_interface_next_index =
194 vlib_node_add_next (vlib_get_main (), af_packet_input_node.index,
199 af_packet_clear_hw_interface_counters (u32 instance)
201 /* Nothing for now */
204 static clib_error_t *
205 af_packet_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
208 af_packet_main_t *apm = &af_packet_main;
209 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
210 af_packet_if_t *apif =
211 pool_elt_at_index (apm->interfaces, hw->dev_instance);
213 int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0);
218 vlib_log_warn (apm->log_class, "af_packet_%s could not open socket",
223 /* if interface is a bridge ignore */
224 if (apif->host_if_index < 0)
225 goto error; /* no error */
227 /* use host_if_index in case host name has changed */
228 ifr.ifr_ifindex = apif->host_if_index;
229 if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0)
231 vlib_log_warn (apm->log_class,
232 "af_packet_%s ioctl could not retrieve eth name",
237 apif->is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
239 if ((rv = ioctl (fd, SIOCGIFFLAGS, &ifr)) < 0)
241 vlib_log_warn (apm->log_class, "af_packet_%s error: %d",
242 apif->is_admin_up ? "up" : "down", rv);
246 if (apif->is_admin_up)
248 hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP;
249 ifr.ifr_flags |= IFF_UP;
254 ifr.ifr_flags &= ~IFF_UP;
257 if ((rv = ioctl (fd, SIOCSIFFLAGS, &ifr)) < 0)
259 vlib_log_warn (apm->log_class, "af_packet_%s error: %d",
260 apif->is_admin_up ? "up" : "down", rv);
264 vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
270 return 0; /* no error */
273 static clib_error_t *
274 af_packet_subif_add_del_function (vnet_main_t * vnm,
276 struct vnet_sw_interface_t *st, int is_add)
278 /* Nothing for now */
282 static clib_error_t *af_packet_set_mac_address_function
283 (struct vnet_hw_interface_t *hi, const u8 * old_address, const u8 * address)
285 af_packet_main_t *apm = &af_packet_main;
286 af_packet_if_t *apif =
287 pool_elt_at_index (apm->interfaces, hi->dev_instance);
288 int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0);
293 vlib_log_warn (apm->log_class, "af_packet_%s could not open socket",
298 /* if interface is a bridge ignore */
299 if (apif->host_if_index < 0)
300 goto error; /* no error */
302 /* use host_if_index in case host name has changed */
303 ifr.ifr_ifindex = apif->host_if_index;
304 if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0)
308 "af_packet_%s ioctl could not retrieve eth name, error: %d",
309 apif->host_if_name, rv);
313 clib_memcpy (ifr.ifr_hwaddr.sa_data, address, 6);
314 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
316 if ((rv = ioctl (fd, SIOCSIFHWADDR, &ifr)) < 0)
318 vlib_log_warn (apm->log_class,
319 "af_packet_%s ioctl could not set mac, error: %d",
320 apif->host_if_name, rv);
329 return 0; /* no error */
333 VNET_DEVICE_CLASS (af_packet_device_class) = {
335 .format_device_name = format_af_packet_device_name,
336 .format_device = format_af_packet_device,
337 .format_tx_trace = format_af_packet_tx_trace,
338 .tx_function_n_errors = AF_PACKET_TX_N_ERROR,
339 .tx_function_error_strings = af_packet_tx_func_error_strings,
340 .rx_redirect_to_node = af_packet_set_interface_next_node,
341 .clear_counters = af_packet_clear_hw_interface_counters,
342 .admin_up_down_function = af_packet_interface_admin_up_down,
343 .subif_add_del_function = af_packet_subif_add_del_function,
344 .mac_addr_change_function = af_packet_set_mac_address_function,
349 * fd.io coding-style-patch-verification: ON
352 * eval: (c-set-style "gnu")