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>
23 #include <vlib/vlib.h>
24 #include <vlib/unix/unix.h>
25 #include <vnet/ip/ip.h>
26 #include <vnet/ethernet/ethernet.h>
28 #include <vnet/devices/af_packet/af_packet.h>
30 #define AF_PACKET_DEBUG_SOCKET 0
32 #define AF_PACKET_TX_FRAMES_PER_BLOCK 1024
33 #define AF_PACKET_TX_FRAME_SIZE (2048 * 5)
34 #define AF_PACKET_TX_BLOCK_NR 1
35 #define AF_PACKET_TX_FRAME_NR (AF_PACKET_TX_BLOCK_NR * \
36 AF_PACKET_TX_FRAMES_PER_BLOCK)
37 #define AF_PACKET_TX_BLOCK_SIZE (AF_PACKET_TX_FRAME_SIZE * \
38 AF_PACKET_TX_FRAMES_PER_BLOCK)
40 #define AF_PACKET_RX_FRAMES_PER_BLOCK 1024
41 #define AF_PACKET_RX_FRAME_SIZE (2048 * 5)
42 #define AF_PACKET_RX_BLOCK_NR 1
43 #define AF_PACKET_RX_FRAME_NR (AF_PACKET_RX_BLOCK_NR * \
44 AF_PACKET_RX_FRAMES_PER_BLOCK)
45 #define AF_PACKET_RX_BLOCK_SIZE (AF_PACKET_RX_FRAME_SIZE * \
46 AF_PACKET_RX_FRAMES_PER_BLOCK)
48 #if AF_PACKET_DEBUG_SOCKET == 1
49 #define DBG_SOCK(args...) clib_warning(args);
51 #define DBG_SOCK(args...)
54 /*defined in net/if.h but clashes with dpdk headers */
55 unsigned int if_nametoindex(const char *ifname);
57 typedef struct tpacket_req tpacket_req_t;
60 af_packet_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi, u32 flags)
66 static clib_error_t * af_packet_fd_read_ready (unix_file_t * uf)
68 vlib_main_t * vm = vlib_get_main();
69 af_packet_main_t * apm = &af_packet_main;
70 u32 idx = uf->private_data;
72 apm->pending_input_bitmap = clib_bitmap_set (apm->pending_input_bitmap, idx, 1);
74 /* Schedule the rx node */
75 vlib_node_set_interrupt_pending (vm, af_packet_input_node.index);
81 create_packet_v2_sock(u8 * name, tpacket_req_t * rx_req, tpacket_req_t * tx_req,
85 struct sockaddr_ll sll;
88 socklen_t req_sz = sizeof(struct tpacket_req);
89 u32 ring_sz = rx_req->tp_block_size * rx_req->tp_block_nr +
90 tx_req->tp_block_size * tx_req->tp_block_nr;
92 host_if_index = if_nametoindex((const char *) name);
96 DBG_SOCK("Wrong host interface name");
97 ret = VNET_API_ERROR_INVALID_INTERFACE;
101 if ((*fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0)
103 DBG_SOCK("Failed to create socket");
104 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
108 if ((err = setsockopt(*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof(ver))) < 0)
110 DBG_SOCK("Failed to set rx packet interface version");
111 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
116 if ((err = setsockopt(*fd, SOL_PACKET, PACKET_LOSS, &opt, sizeof(opt))) < 0)
118 DBG_SOCK("Failed to set packet tx ring error handling option");
119 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
123 if ((err = setsockopt(*fd, SOL_PACKET, PACKET_RX_RING, rx_req, req_sz)) < 0)
125 DBG_SOCK("Failed to set packet rx ring options");
126 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
130 if ((err = setsockopt(*fd, SOL_PACKET, PACKET_TX_RING, tx_req, req_sz)) < 0)
132 DBG_SOCK("Failed to set packet rx ring options");
133 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
137 *ring = mmap(NULL, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, *fd, 0);
138 if (*ring == MAP_FAILED)
140 DBG_SOCK("mmap failure");
141 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
145 memset(&sll, 0, sizeof(sll));
146 sll.sll_family = PF_PACKET;
147 sll.sll_protocol = htons(ETH_P_ALL);
148 sll.sll_ifindex = host_if_index;
150 if ((err = bind(*fd, (struct sockaddr *) &sll, sizeof(sll))) < 0)
152 DBG_SOCK("Failed to bind rx packet socket (error %d)", err);
153 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
166 af_packet_create_if(vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set, u32 *sw_if_index)
168 af_packet_main_t * apm = &af_packet_main;
170 struct tpacket_req * rx_req = 0;
171 struct tpacket_req * tx_req = 0;
173 af_packet_if_t * apif = 0;
175 clib_error_t * error;
176 vnet_sw_interface_t * sw;
177 vnet_main_t *vnm = vnet_get_main();
181 p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
184 return VNET_API_ERROR_SUBIF_ALREADY_EXISTS;
187 vec_validate(rx_req, 0);
188 rx_req->tp_block_size = AF_PACKET_RX_BLOCK_SIZE;
189 rx_req->tp_frame_size = AF_PACKET_RX_FRAME_SIZE;
190 rx_req->tp_block_nr = AF_PACKET_RX_BLOCK_NR;
191 rx_req->tp_frame_nr = AF_PACKET_RX_FRAME_NR;
193 vec_validate(tx_req, 0);
194 tx_req->tp_block_size = AF_PACKET_TX_BLOCK_SIZE;
195 tx_req->tp_frame_size = AF_PACKET_TX_FRAME_SIZE;
196 tx_req->tp_block_nr = AF_PACKET_TX_BLOCK_NR;
197 tx_req->tp_frame_nr = AF_PACKET_TX_FRAME_NR;
199 ret = create_packet_v2_sock(host_if_name, rx_req, tx_req, &fd, &ring);
204 /* So far everything looks good, let's create interface */
205 pool_get (apm->interfaces, apif);
206 if_index = apif - apm->interfaces;
209 apif->rx_ring = ring;
210 apif->tx_ring = ring + rx_req->tp_block_size * rx_req->tp_block_nr;
211 apif->rx_req = rx_req;
212 apif->tx_req = tx_req;
213 apif->host_if_name = host_if_name;
214 apif->per_interface_next_index = ~0;
215 apif->next_tx_frame = 0;
216 apif->next_rx_frame = 0;
219 unix_file_t template = {0};
220 template.read_function = af_packet_fd_read_ready;
221 template.file_descriptor = fd;
222 template.private_data = if_index;
223 template.flags = UNIX_FILE_EVENT_EDGE_TRIGGERED;
224 apif->unix_file_index = unix_file_add (&unix_main, &template);
227 /*use configured or generate random MAC address */
229 clib_memcpy(hw_addr, hw_addr_set, 6);
232 f64 now = vlib_time_now(vm);
234 rnd = (u32) (now * 1e6);
235 rnd = random_u32 (&rnd);
237 clib_memcpy (hw_addr+2, &rnd, sizeof(rnd));
242 error = ethernet_register_interface(vnm, af_packet_device_class.index,
243 if_index, hw_addr, &apif->hw_if_index,
244 af_packet_eth_flag_change);
248 memset(apif, 0, sizeof(*apif));
249 pool_put(apm->interfaces, apif);
250 clib_error_report (error);
251 ret = VNET_API_ERROR_SYSCALL_ERROR_1;
255 sw = vnet_get_hw_sw_interface (vnm, apif->hw_if_index);
256 apif->sw_if_index = sw->sw_if_index;
258 vnet_hw_interface_set_flags (vnm, apif->hw_if_index,
259 VNET_HW_INTERFACE_FLAG_LINK_UP);
261 mhash_set_mem (&apm->if_index_by_host_if_name, host_if_name, &if_index, 0);
263 *sw_if_index = apif->sw_if_index;
267 vec_free(host_if_name);
274 af_packet_delete_if(vlib_main_t *vm, u8 *host_if_name)
276 vnet_main_t *vnm = vnet_get_main();
277 af_packet_main_t *apm = &af_packet_main;
278 af_packet_if_t *apif;
283 p = mhash_get(&apm->if_index_by_host_if_name, host_if_name);
285 clib_warning("Host interface %s does not exist", host_if_name);
286 return VNET_API_ERROR_SYSCALL_ERROR_1;
288 apif = pool_elt_at_index(apm->interfaces, p[0]);
289 if_index = apif - apm->interfaces;
291 /* bring down the interface */
292 vnet_hw_interface_set_flags(vnm, apif->hw_if_index, 0);
295 if (apif->unix_file_index != ~0) {
296 unix_file_del(&unix_main, unix_main.file_pool + apif->unix_file_index);
297 apif->unix_file_index = ~0;
299 ring_sz = apif->rx_req->tp_block_size * apif->rx_req->tp_block_nr +
300 apif->tx_req->tp_block_size * apif->tx_req->tp_block_nr;
301 if (munmap(apif->rx_ring, ring_sz))
302 clib_warning("Host interface %s could not free rx/tx ring", host_if_name);
303 apif->rx_ring = NULL;
304 apif->tx_ring = NULL;
308 vec_free(apif->rx_req);
310 vec_free(apif->tx_req);
313 vec_free(apif->host_if_name);
314 apif->host_if_name = NULL;
316 mhash_unset(&apm->if_index_by_host_if_name, host_if_name, &if_index);
318 ethernet_delete_interface(vnm, apif->hw_if_index);
320 pool_put(apm->interfaces, apif);
325 static clib_error_t *
326 af_packet_init (vlib_main_t * vm)
328 af_packet_main_t * apm = &af_packet_main;
330 memset (apm, 0, sizeof (af_packet_main_t));
332 mhash_init_vec_string (&apm->if_index_by_host_if_name, sizeof (uword));
337 VLIB_INIT_FUNCTION (af_packet_init);