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
55 format_af_packet_device_name (u8 * s, va_list * args)
57 u32 i = va_arg (*args, u32);
58 af_packet_main_t *apm = &af_packet_main;
59 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, i);
61 s = format (s, "host-%s", apif->host_if_name);
66 format_af_packet_device (u8 * s, va_list * args)
68 s = format (s, "Linux PACKET socket interface");
73 format_af_packet_tx_trace (u8 * s, va_list * args)
75 s = format (s, "Unimplemented...");
80 af_packet_interface_tx (vlib_main_t * vm,
81 vlib_node_runtime_t * node, vlib_frame_t * frame)
83 af_packet_main_t *apm = &af_packet_main;
84 u32 *buffers = vlib_frame_args (frame);
85 u32 n_left = frame->n_vectors;
87 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
88 af_packet_if_t *apif =
89 pool_elt_at_index (apm->interfaces, rd->dev_instance);
90 clib_spinlock_lock_if_init (&apif->lockp);
92 u32 block_size = apif->tx_req->tp_block_size;
93 u32 frame_size = apif->tx_req->tp_frame_size;
94 u32 frame_num = apif->tx_req->tp_frame_nr;
95 u8 *block_start = apif->tx_ring + block * block_size;
96 u32 tx_frame = apif->next_tx_frame;
97 struct tpacket2_hdr *tph;
98 u32 frame_not_ready = 0;
109 tph = (struct tpacket2_hdr *) (block_start + tx_frame * frame_size);
112 (tph->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING)))
120 b0 = vlib_get_buffer (vm, bi);
121 len = b0->current_length;
122 clib_memcpy ((u8 *) tph +
123 TPACKET_ALIGN (sizeof (struct tpacket2_hdr)) + offset,
124 vlib_buffer_get_current (b0), len);
128 (b0->flags & VLIB_BUFFER_NEXT_PRESENT) ? b0->next_buffer : 0));
130 tph->tp_len = tph->tp_snaplen = offset;
131 tph->tp_status = TP_STATUS_SEND_REQUEST;
134 tx_frame = (tx_frame + 1) % frame_num;
136 /* check if we've exhausted the ring */
137 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
141 CLIB_MEMORY_BARRIER ();
143 if (PREDICT_TRUE (n_sent))
145 apif->next_tx_frame = tx_frame;
147 if (PREDICT_FALSE (sendto (apif->fd, NULL, 0,
148 MSG_DONTWAIT, NULL, 0) == -1))
150 /* Uh-oh, drop & move on, but count whether it was fatal or not.
151 * Note that we have no reliable way to properly determine the
152 * disposition of the packets we just enqueued for delivery.
154 vlib_error_count (vm, node->node_index,
155 unix_error_is_fatal (errno) ?
156 AF_PACKET_TX_ERROR_TXRING_FATAL :
157 AF_PACKET_TX_ERROR_TXRING_EAGAIN, n_sent);
161 clib_spinlock_unlock_if_init (&apif->lockp);
163 if (PREDICT_FALSE (frame_not_ready))
164 vlib_error_count (vm, node->node_index,
165 AF_PACKET_TX_ERROR_FRAME_NOT_READY, frame_not_ready);
167 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
168 vlib_error_count (vm, node->node_index, AF_PACKET_TX_ERROR_TXRING_OVERRUN,
171 vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
172 return frame->n_vectors;
176 af_packet_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
179 af_packet_main_t *apm = &af_packet_main;
180 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
181 af_packet_if_t *apif =
182 pool_elt_at_index (apm->interfaces, hw->dev_instance);
184 /* Shut off redirection */
185 if (node_index == ~0)
187 apif->per_interface_next_index = node_index;
191 apif->per_interface_next_index =
192 vlib_node_add_next (vlib_get_main (), af_packet_input_node.index,
197 af_packet_clear_hw_interface_counters (u32 instance)
199 /* Nothing for now */
202 static clib_error_t *
203 af_packet_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
206 af_packet_main_t *apm = &af_packet_main;
207 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
208 af_packet_if_t *apif =
209 pool_elt_at_index (apm->interfaces, hw->dev_instance);
211 int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0);
216 vlib_log_warn (apm->log_class, "af_packet_%s could not open socket",
221 /* if interface is a bridge ignore */
222 if (apif->host_if_index < 0)
223 goto error; /* no error */
225 /* use host_if_index in case host name has changed */
226 ifr.ifr_ifindex = apif->host_if_index;
227 if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0)
229 vlib_log_warn (apm->log_class,
230 "af_packet_%s ioctl could not retrieve eth name",
235 apif->is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
237 if ((rv = ioctl (fd, SIOCGIFFLAGS, &ifr)) < 0)
239 vlib_log_warn (apm->log_class, "af_packet_%s error: %d",
240 apif->is_admin_up ? "up" : "down", rv);
244 if (apif->is_admin_up)
246 hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP;
247 ifr.ifr_flags |= IFF_UP;
252 ifr.ifr_flags &= ~IFF_UP;
255 if ((rv = ioctl (fd, SIOCSIFFLAGS, &ifr)) < 0)
257 vlib_log_warn (apm->log_class, "af_packet_%s error: %d",
258 apif->is_admin_up ? "up" : "down", rv);
262 vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
268 return 0; /* no error */
271 static clib_error_t *
272 af_packet_subif_add_del_function (vnet_main_t * vnm,
274 struct vnet_sw_interface_t *st, int is_add)
276 /* Nothing for now */
280 static clib_error_t *af_packet_set_mac_address_function
281 (struct vnet_hw_interface_t *hi, const u8 * old_address, const u8 * address)
283 af_packet_main_t *apm = &af_packet_main;
284 af_packet_if_t *apif =
285 pool_elt_at_index (apm->interfaces, hi->dev_instance);
286 int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0);
291 vlib_log_warn (apm->log_class, "af_packet_%s could not open socket",
296 /* if interface is a bridge ignore */
297 if (apif->host_if_index < 0)
298 goto error; /* no error */
300 /* use host_if_index in case host name has changed */
301 ifr.ifr_ifindex = apif->host_if_index;
302 if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0)
306 "af_packet_%s ioctl could not retrieve eth name, error: %d",
307 apif->host_if_name, rv);
311 clib_memcpy (ifr.ifr_hwaddr.sa_data, address, 6);
312 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
314 if ((rv = ioctl (fd, SIOCSIFHWADDR, &ifr)) < 0)
316 vlib_log_warn (apm->log_class,
317 "af_packet_%s ioctl could not set mac, error: %d",
318 apif->host_if_name, rv);
327 return 0; /* no error */
331 VNET_DEVICE_CLASS (af_packet_device_class) = {
333 .tx_function = af_packet_interface_tx,
334 .format_device_name = format_af_packet_device_name,
335 .format_device = format_af_packet_device,
336 .format_tx_trace = format_af_packet_tx_trace,
337 .tx_function_n_errors = AF_PACKET_TX_N_ERROR,
338 .tx_function_error_strings = af_packet_tx_func_error_strings,
339 .rx_redirect_to_node = af_packet_set_interface_next_node,
340 .clear_counters = af_packet_clear_hw_interface_counters,
341 .admin_up_down_function = af_packet_interface_admin_up_down,
342 .subif_add_del_function = af_packet_subif_add_del_function,
343 .mac_addr_change_function = af_packet_set_mac_address_function,
346 VLIB_DEVICE_TX_FUNCTION_MULTIARCH (af_packet_device_class,
347 af_packet_interface_tx)
351 * fd.io coding-style-patch-verification: ON
354 * eval: (c-set-style "gnu")