| /* |
| *------------------------------------------------------------------ |
| * af_packet.c - linux kernel packet interface |
| * |
| * Copyright (c) 2016 Cisco and/or its affiliates. |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| *------------------------------------------------------------------ |
| */ |
| |
| #include <linux/if_ether.h> |
| #include <linux/if_packet.h> |
| #include <dirent.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <fcntl.h> |
| |
| #include <vlib/vlib.h> |
| #include <vlib/unix/unix.h> |
| #include <vlib/linux/sysfs.h> |
| #include <vnet/ip/ip.h> |
| #include <vnet/ethernet/ethernet.h> |
| |
| #include <vnet/devices/af_packet/af_packet.h> |
| |
| #define AF_PACKET_DEBUG_SOCKET 0 |
| |
| #define AF_PACKET_TX_FRAMES_PER_BLOCK 1024 |
| #define AF_PACKET_TX_FRAME_SIZE (2048 * 5) |
| #define AF_PACKET_TX_BLOCK_NR 1 |
| #define AF_PACKET_TX_FRAME_NR (AF_PACKET_TX_BLOCK_NR * \ |
| AF_PACKET_TX_FRAMES_PER_BLOCK) |
| #define AF_PACKET_TX_BLOCK_SIZE (AF_PACKET_TX_FRAME_SIZE * \ |
| AF_PACKET_TX_FRAMES_PER_BLOCK) |
| |
| #define AF_PACKET_RX_FRAMES_PER_BLOCK 1024 |
| #define AF_PACKET_RX_FRAME_SIZE (2048 * 5) |
| #define AF_PACKET_RX_BLOCK_NR 1 |
| #define AF_PACKET_RX_FRAME_NR (AF_PACKET_RX_BLOCK_NR * \ |
| AF_PACKET_RX_FRAMES_PER_BLOCK) |
| #define AF_PACKET_RX_BLOCK_SIZE (AF_PACKET_RX_FRAME_SIZE * \ |
| AF_PACKET_RX_FRAMES_PER_BLOCK) |
| |
| #if AF_PACKET_DEBUG_SOCKET == 1 |
| #define DBG_SOCK(args...) clib_warning(args); |
| #else |
| #define DBG_SOCK(args...) |
| #endif |
| |
| /*defined in net/if.h but clashes with dpdk headers */ |
| unsigned int if_nametoindex (const char *ifname); |
| |
| typedef struct tpacket_req tpacket_req_t; |
| |
| static u32 |
| af_packet_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi, |
| u32 flags) |
| { |
| clib_error_t *error; |
| u8 *s; |
| af_packet_main_t *apm = &af_packet_main; |
| af_packet_if_t *apif = |
| pool_elt_at_index (apm->interfaces, hi->dev_instance); |
| |
| if (ETHERNET_INTERFACE_FLAG_MTU == (flags & ETHERNET_INTERFACE_FLAG_MTU)) |
| { |
| s = format (0, "/sys/class/net/%s/mtu%c", apif->host_if_name, 0); |
| |
| error = vlib_sysfs_write ((char *) s, "%d", hi->max_packet_bytes); |
| vec_free (s); |
| |
| if (error) |
| { |
| clib_error_report (error); |
| return VNET_API_ERROR_SYSCALL_ERROR_1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static clib_error_t * |
| af_packet_fd_read_ready (clib_file_t * uf) |
| { |
| af_packet_main_t *apm = &af_packet_main; |
| vnet_main_t *vnm = vnet_get_main (); |
| u32 idx = uf->private_data; |
| af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, idx); |
| |
| apm->pending_input_bitmap = |
| clib_bitmap_set (apm->pending_input_bitmap, idx, 1); |
| |
| /* Schedule the rx node */ |
| vnet_device_input_set_interrupt_pending (vnm, apif->hw_if_index, 0); |
| |
| return 0; |
| } |
| |
| static int |
| is_bridge (const u8 * host_if_name) |
| { |
| u8 *s; |
| DIR *dir = NULL; |
| |
| s = format (0, "/sys/class/net/%s/bridge%c", host_if_name, 0); |
| dir = opendir ((char *) s); |
| vec_free (s); |
| |
| if (dir) |
| { |
| closedir (dir); |
| return 0; |
| } |
| |
| return -1; |
| } |
| |
| static int |
| create_packet_v2_sock (int host_if_index, tpacket_req_t * rx_req, |
| tpacket_req_t * tx_req, int *fd, u8 ** ring) |
| { |
| int ret, err; |
| struct sockaddr_ll sll; |
| int ver = TPACKET_V2; |
| socklen_t req_sz = sizeof (struct tpacket_req); |
| u32 ring_sz = rx_req->tp_block_size * rx_req->tp_block_nr + |
| tx_req->tp_block_size * tx_req->tp_block_nr; |
| |
| if ((*fd = socket (AF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0) |
| { |
| DBG_SOCK ("Failed to create socket"); |
| ret = VNET_API_ERROR_SYSCALL_ERROR_1; |
| goto error; |
| } |
| |
| if ((err = |
| setsockopt (*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof (ver))) < 0) |
| { |
| DBG_SOCK ("Failed to set rx packet interface version"); |
| ret = VNET_API_ERROR_SYSCALL_ERROR_1; |
| goto error; |
| } |
| |
| int opt = 1; |
| if ((err = |
| setsockopt (*fd, SOL_PACKET, PACKET_LOSS, &opt, sizeof (opt))) < 0) |
| { |
| DBG_SOCK ("Failed to set packet tx ring error handling option"); |
| ret = VNET_API_ERROR_SYSCALL_ERROR_1; |
| goto error; |
| } |
| |
| if ((err = |
| setsockopt (*fd, SOL_PACKET, PACKET_RX_RING, rx_req, req_sz)) < 0) |
| { |
| DBG_SOCK ("Failed to set packet rx ring options"); |
| ret = VNET_API_ERROR_SYSCALL_ERROR_1; |
| goto error; |
| } |
| |
| if ((err = |
| setsockopt (*fd, SOL_PACKET, PACKET_TX_RING, tx_req, req_sz)) < 0) |
| { |
| DBG_SOCK ("Failed to set packet rx ring options"); |
| ret = VNET_API_ERROR_SYSCALL_ERROR_1; |
| goto error; |
| } |
| |
| *ring = |
| mmap (NULL, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, *fd, |
| 0); |
| if (*ring == MAP_FAILED) |
| { |
| DBG_SOCK ("mmap failure"); |
| ret = VNET_API_ERROR_SYSCALL_ERROR_1; |
| goto error; |
| } |
| |
| memset (&sll, 0, sizeof (sll)); |
| sll.sll_family = PF_PACKET; |
| sll.sll_protocol = htons (ETH_P_ALL); |
| sll.sll_ifindex = host_if_index; |
| |
| if ((err = bind (*fd, (struct sockaddr *) &sll, sizeof (sll))) < 0) |
| { |
| DBG_SOCK ("Failed to bind rx packet socket (error %d)", err); |
| ret = VNET_API_ERROR_SYSCALL_ERROR_1; |
| goto error; |
| } |
| |
| return 0; |
| error: |
| if (*fd >= 0) |
| close (*fd); |
| *fd = -1; |
| return ret; |
| } |
| |
| int |
| af_packet_create_if (vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set, |
| u32 * sw_if_index) |
| { |
| af_packet_main_t *apm = &af_packet_main; |
| int ret, fd = -1; |
| struct tpacket_req *rx_req = 0; |
| struct tpacket_req *tx_req = 0; |
| u8 *ring = 0; |
| af_packet_if_t *apif = 0; |
| u8 hw_addr[6]; |
| clib_error_t *error; |
| vnet_sw_interface_t *sw; |
| vnet_hw_interface_t *hw; |
| vlib_thread_main_t *tm = vlib_get_thread_main (); |
| vnet_main_t *vnm = vnet_get_main (); |
| uword *p; |
| uword if_index; |
| u8 *host_if_name_dup = vec_dup (host_if_name); |
| int host_if_index = -1; |
| |
| p = mhash_get (&apm->if_index_by_host_if_name, host_if_name); |
| if (p) |
| { |
| return VNET_API_ERROR_SUBIF_ALREADY_EXISTS; |
| } |
| |
| vec_validate (rx_req, 0); |
| rx_req->tp_block_size = AF_PACKET_RX_BLOCK_SIZE; |
| rx_req->tp_frame_size = AF_PACKET_RX_FRAME_SIZE; |
| rx_req->tp_block_nr = AF_PACKET_RX_BLOCK_NR; |
| rx_req->tp_frame_nr = AF_PACKET_RX_FRAME_NR; |
| |
| vec_validate (tx_req, 0); |
| tx_req->tp_block_size = AF_PACKET_TX_BLOCK_SIZE; |
| tx_req->tp_frame_size = AF_PACKET_TX_FRAME_SIZE; |
| tx_req->tp_block_nr = AF_PACKET_TX_BLOCK_NR; |
| tx_req->tp_frame_nr = AF_PACKET_TX_FRAME_NR; |
| |
| host_if_index = if_nametoindex ((const char *) host_if_name); |
| |
| if (!host_if_index) |
| { |
| DBG_SOCK ("Wrong host interface name"); |
| return VNET_API_ERROR_INVALID_INTERFACE; |
| } |
| |
| ret = create_packet_v2_sock (host_if_index, rx_req, tx_req, &fd, &ring); |
| |
| if (ret != 0) |
| goto error; |
| |
| ret = is_bridge (host_if_name); |
| |
| if (ret == 0) /* is a bridge, ignore state */ |
| host_if_index = -1; |
| |
| /* So far everything looks good, let's create interface */ |
| pool_get (apm->interfaces, apif); |
| if_index = apif - apm->interfaces; |
| |
| apif->host_if_index = host_if_index; |
| apif->fd = fd; |
| apif->rx_ring = ring; |
| apif->tx_ring = ring + rx_req->tp_block_size * rx_req->tp_block_nr; |
| apif->rx_req = rx_req; |
| apif->tx_req = tx_req; |
| apif->host_if_name = host_if_name_dup; |
| apif->per_interface_next_index = ~0; |
| apif->next_tx_frame = 0; |
| apif->next_rx_frame = 0; |
| |
| if (tm->n_vlib_mains > 1) |
| clib_spinlock_init (&apif->lockp); |
| |
| { |
| clib_file_t template = { 0 }; |
| template.read_function = af_packet_fd_read_ready; |
| template.file_descriptor = fd; |
| template.private_data = if_index; |
| template.flags = UNIX_FILE_EVENT_EDGE_TRIGGERED; |
| apif->clib_file_index = clib_file_add (&file_main, &template); |
| } |
| |
| /*use configured or generate random MAC address */ |
| if (hw_addr_set) |
| clib_memcpy (hw_addr, hw_addr_set, 6); |
| else |
| { |
| f64 now = vlib_time_now (vm); |
| u32 rnd; |
| rnd = (u32) (now * 1e6); |
| rnd = random_u32 (&rnd); |
| |
| clib_memcpy (hw_addr + 2, &rnd, sizeof (rnd)); |
| hw_addr[0] = 2; |
| hw_addr[1] = 0xfe; |
| } |
| |
| error = ethernet_register_interface (vnm, af_packet_device_class.index, |
| if_index, hw_addr, &apif->hw_if_index, |
| af_packet_eth_flag_change); |
| |
| if (error) |
| { |
| memset (apif, 0, sizeof (*apif)); |
| pool_put (apm->interfaces, apif); |
| clib_error_report (error); |
| ret = VNET_API_ERROR_SYSCALL_ERROR_1; |
| goto error; |
| } |
| |
| sw = vnet_get_hw_sw_interface (vnm, apif->hw_if_index); |
| hw = vnet_get_hw_interface (vnm, apif->hw_if_index); |
| apif->sw_if_index = sw->sw_if_index; |
| vnet_hw_interface_set_input_node (vnm, apif->hw_if_index, |
| af_packet_input_node.index); |
| |
| vnet_hw_interface_assign_rx_thread (vnm, apif->hw_if_index, 0, /* queue */ |
| ~0 /* any cpu */ ); |
| |
| hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE; |
| vnet_hw_interface_set_flags (vnm, apif->hw_if_index, |
| VNET_HW_INTERFACE_FLAG_LINK_UP); |
| |
| vnet_hw_interface_set_rx_mode (vnm, apif->hw_if_index, 0, |
| VNET_HW_INTERFACE_RX_MODE_INTERRUPT); |
| |
| mhash_set_mem (&apm->if_index_by_host_if_name, host_if_name_dup, &if_index, |
| 0); |
| if (sw_if_index) |
| *sw_if_index = apif->sw_if_index; |
| |
| return 0; |
| |
| error: |
| vec_free (host_if_name_dup); |
| vec_free (rx_req); |
| vec_free (tx_req); |
| return ret; |
| } |
| |
| int |
| af_packet_delete_if (vlib_main_t * vm, u8 * host_if_name) |
| { |
| vnet_main_t *vnm = vnet_get_main (); |
| af_packet_main_t *apm = &af_packet_main; |
| af_packet_if_t *apif; |
| uword *p; |
| uword if_index; |
| u32 ring_sz; |
| |
| p = mhash_get (&apm->if_index_by_host_if_name, host_if_name); |
| if (p == NULL) |
| { |
| clib_warning ("Host interface %s does not exist", host_if_name); |
| return VNET_API_ERROR_SYSCALL_ERROR_1; |
| } |
| apif = pool_elt_at_index (apm->interfaces, p[0]); |
| if_index = apif - apm->interfaces; |
| |
| /* bring down the interface */ |
| vnet_hw_interface_set_flags (vnm, apif->hw_if_index, 0); |
| vnet_hw_interface_unassign_rx_thread (vnm, apif->hw_if_index, 0); |
| |
| /* clean up */ |
| if (apif->clib_file_index != ~0) |
| { |
| clib_file_del (&file_main, file_main.file_pool + apif->clib_file_index); |
| apif->clib_file_index = ~0; |
| } |
| else |
| close (apif->fd); |
| |
| ring_sz = apif->rx_req->tp_block_size * apif->rx_req->tp_block_nr + |
| apif->tx_req->tp_block_size * apif->tx_req->tp_block_nr; |
| if (munmap (apif->rx_ring, ring_sz)) |
| clib_warning ("Host interface %s could not free rx/tx ring", |
| host_if_name); |
| apif->rx_ring = NULL; |
| apif->tx_ring = NULL; |
| apif->fd = -1; |
| |
| vec_free (apif->rx_req); |
| apif->rx_req = NULL; |
| vec_free (apif->tx_req); |
| apif->tx_req = NULL; |
| |
| vec_free (apif->host_if_name); |
| apif->host_if_name = NULL; |
| apif->host_if_index = -1; |
| |
| mhash_unset (&apm->if_index_by_host_if_name, host_if_name, &if_index); |
| |
| ethernet_delete_interface (vnm, apif->hw_if_index); |
| |
| pool_put (apm->interfaces, apif); |
| |
| return 0; |
| } |
| |
| static clib_error_t * |
| af_packet_init (vlib_main_t * vm) |
| { |
| af_packet_main_t *apm = &af_packet_main; |
| vlib_thread_main_t *tm = vlib_get_thread_main (); |
| |
| memset (apm, 0, sizeof (af_packet_main_t)); |
| |
| mhash_init_vec_string (&apm->if_index_by_host_if_name, sizeof (uword)); |
| |
| vec_validate_aligned (apm->rx_buffers, tm->n_vlib_mains - 1, |
| CLIB_CACHE_LINE_BYTES); |
| |
| return 0; |
| } |
| |
| VLIB_INIT_FUNCTION (af_packet_init); |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |