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 u32 dev_instance = va_arg (*args, u32);
71 u32 indent = format_get_indent (s);
72 int __clib_unused verbose = va_arg (*args, int);
74 af_packet_main_t *apm = &af_packet_main;
75 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, dev_instance);
76 clib_spinlock_lock_if_init (&apif->lockp);
77 u32 tx_block_sz = apif->tx_req->tp_block_size;
78 u32 tx_frame_sz = apif->tx_req->tp_frame_size;
79 u32 tx_frame_nr = apif->tx_req->tp_frame_nr;
80 u32 tx_block_nr = apif->tx_req->tp_block_nr;
81 u32 rx_block_size = apif->rx_req->tp_block_size;
82 u32 rx_frame_size = apif->rx_req->tp_frame_size;
83 u32 rx_frame_nr = apif->rx_req->tp_frame_nr;
84 u32 rx_block_nr = apif->rx_req->tp_block_nr;
86 u8 *tx_block_start = apif->tx_ring + block * tx_block_sz;
87 u32 tx_frame = apif->next_tx_frame;
88 struct tpacket2_hdr *tph;
90 s = format (s, "Linux PACKET socket interface\n");
91 s = format (s, "%UTX block size:%d nr:%d TX frame size:%d nr:%d\n",
92 format_white_space, indent, tx_block_sz, tx_block_nr,
93 tx_frame_sz, tx_frame_nr);
94 s = format (s, "%URX block size:%d nr:%d RX frame size:%d nr:%d\n",
95 format_white_space, indent, rx_block_size, rx_block_nr,
96 rx_frame_size, rx_frame_nr);
97 s = format (s, "%Unext frame:%d\n", format_white_space, indent,
100 int n_send_req = 0, n_avail = 0, n_sending = 0, n_tot = 0, n_wrong = 0;
103 tph = (struct tpacket2_hdr *) (tx_block_start + tx_frame * tx_frame_sz);
104 tx_frame = (tx_frame + 1) % tx_frame_nr;
105 if (tph->tp_status == 0)
107 else if (tph->tp_status & TP_STATUS_SEND_REQUEST)
109 else if (tph->tp_status & TP_STATUS_SENDING)
115 while (tx_frame != apif->next_tx_frame);
116 s = format (s, "%Uavailable:%d request:%d sending:%d wrong:%d total:%d\n",
117 format_white_space, indent, n_avail, n_send_req, n_sending,
120 clib_spinlock_unlock_if_init (&apif->lockp);
125 format_af_packet_tx_trace (u8 * s, va_list * args)
127 s = format (s, "Unimplemented...");
131 VNET_DEVICE_CLASS_TX_FN (af_packet_device_class) (vlib_main_t * vm,
132 vlib_node_runtime_t * node,
133 vlib_frame_t * frame)
135 af_packet_main_t *apm = &af_packet_main;
136 u32 *buffers = vlib_frame_vector_args (frame);
137 u32 n_left = frame->n_vectors;
139 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
140 af_packet_if_t *apif =
141 pool_elt_at_index (apm->interfaces, rd->dev_instance);
142 clib_spinlock_lock_if_init (&apif->lockp);
144 u32 block_size = apif->tx_req->tp_block_size;
145 u32 frame_size = apif->tx_req->tp_frame_size;
146 u32 frame_num = apif->tx_req->tp_frame_nr;
147 u8 *block_start = apif->tx_ring + block * block_size;
148 u32 tx_frame = apif->next_tx_frame;
149 struct tpacket2_hdr *tph;
150 u32 frame_not_ready = 0;
161 tph = (struct tpacket2_hdr *) (block_start + tx_frame * frame_size);
162 if (PREDICT_FALSE (tph->tp_status &
163 (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING)))
171 b0 = vlib_get_buffer (vm, bi);
172 len = b0->current_length;
173 clib_memcpy_fast ((u8 *) tph +
174 TPACKET_ALIGN (sizeof (struct tpacket2_hdr)) +
175 offset, vlib_buffer_get_current (b0), len);
179 (b0->flags & VLIB_BUFFER_NEXT_PRESENT) ? b0->next_buffer : 0));
181 tph->tp_len = tph->tp_snaplen = offset;
182 tph->tp_status = TP_STATUS_SEND_REQUEST;
185 tx_frame = (tx_frame + 1) % frame_num;
188 /* check if we've exhausted the ring */
189 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
193 CLIB_MEMORY_BARRIER ();
195 if (PREDICT_TRUE (n_sent))
197 apif->next_tx_frame = tx_frame;
199 if (PREDICT_FALSE (sendto (apif->fd, NULL, 0, MSG_DONTWAIT, NULL, 0) ==
202 /* Uh-oh, drop & move on, but count whether it was fatal or not.
203 * Note that we have no reliable way to properly determine the
204 * disposition of the packets we just enqueued for delivery.
206 vlib_error_count (vm, node->node_index,
207 unix_error_is_fatal (errno) ?
208 AF_PACKET_TX_ERROR_TXRING_FATAL :
209 AF_PACKET_TX_ERROR_TXRING_EAGAIN,
214 clib_spinlock_unlock_if_init (&apif->lockp);
216 if (PREDICT_FALSE (frame_not_ready))
217 vlib_error_count (vm, node->node_index,
218 AF_PACKET_TX_ERROR_FRAME_NOT_READY, frame_not_ready);
220 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
221 vlib_error_count (vm, node->node_index, AF_PACKET_TX_ERROR_TXRING_OVERRUN,
224 vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors);
225 return frame->n_vectors;
229 af_packet_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
232 af_packet_main_t *apm = &af_packet_main;
233 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
234 af_packet_if_t *apif =
235 pool_elt_at_index (apm->interfaces, hw->dev_instance);
237 /* Shut off redirection */
238 if (node_index == ~0)
240 apif->per_interface_next_index = node_index;
244 apif->per_interface_next_index =
245 vlib_node_add_next (vlib_get_main (), af_packet_input_node.index,
250 af_packet_clear_hw_interface_counters (u32 instance)
252 /* Nothing for now */
255 static clib_error_t *
256 af_packet_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
259 af_packet_main_t *apm = &af_packet_main;
260 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
261 af_packet_if_t *apif =
262 pool_elt_at_index (apm->interfaces, hw->dev_instance);
264 int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0);
269 vlib_log_warn (apm->log_class, "af_packet_%s could not open socket",
274 /* if interface is a bridge ignore */
275 if (apif->host_if_index < 0)
276 goto error; /* no error */
278 /* use host_if_index in case host name has changed */
279 ifr.ifr_ifindex = apif->host_if_index;
280 if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0)
282 vlib_log_warn (apm->log_class,
283 "af_packet_%s ioctl could not retrieve eth name",
288 apif->is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
290 if ((rv = ioctl (fd, SIOCGIFFLAGS, &ifr)) < 0)
292 vlib_log_warn (apm->log_class, "af_packet_%s error: %d",
293 apif->is_admin_up ? "up" : "down", rv);
297 if (apif->is_admin_up)
299 hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP;
300 ifr.ifr_flags |= IFF_UP;
305 ifr.ifr_flags &= ~IFF_UP;
308 if ((rv = ioctl (fd, SIOCSIFFLAGS, &ifr)) < 0)
310 vlib_log_warn (apm->log_class, "af_packet_%s error: %d",
311 apif->is_admin_up ? "up" : "down", rv);
315 vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
321 return 0; /* no error */
324 static clib_error_t *
325 af_packet_subif_add_del_function (vnet_main_t * vnm,
327 struct vnet_sw_interface_t *st, int is_add)
329 /* Nothing for now */
333 static clib_error_t *af_packet_set_mac_address_function
334 (struct vnet_hw_interface_t *hi, const u8 * old_address, const u8 * address)
336 af_packet_main_t *apm = &af_packet_main;
337 af_packet_if_t *apif =
338 pool_elt_at_index (apm->interfaces, hi->dev_instance);
339 int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0);
344 vlib_log_warn (apm->log_class, "af_packet_%s could not open socket",
349 /* if interface is a bridge ignore */
350 if (apif->host_if_index < 0)
351 goto error; /* no error */
353 /* use host_if_index in case host name has changed */
354 ifr.ifr_ifindex = apif->host_if_index;
355 if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0)
359 "af_packet_%s ioctl could not retrieve eth name, error: %d",
360 apif->host_if_name, rv);
364 clib_memcpy (ifr.ifr_hwaddr.sa_data, address, 6);
365 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
367 if ((rv = ioctl (fd, SIOCSIFHWADDR, &ifr)) < 0)
369 vlib_log_warn (apm->log_class,
370 "af_packet_%s ioctl could not set mac, error: %d",
371 apif->host_if_name, rv);
380 return 0; /* no error */
383 VNET_DEVICE_CLASS (af_packet_device_class) = {
385 .format_device_name = format_af_packet_device_name,
386 .format_device = format_af_packet_device,
387 .format_tx_trace = format_af_packet_tx_trace,
388 .tx_function_n_errors = AF_PACKET_TX_N_ERROR,
389 .tx_function_error_strings = af_packet_tx_func_error_strings,
390 .rx_redirect_to_node = af_packet_set_interface_next_node,
391 .clear_counters = af_packet_clear_hw_interface_counters,
392 .admin_up_down_function = af_packet_interface_admin_up_down,
393 .subif_add_del_function = af_packet_subif_add_del_function,
394 .mac_addr_change_function = af_packet_set_mac_address_function,
398 * fd.io coding-style-patch-verification: ON
401 * eval: (c-set-style "gnu")