| /* |
| *------------------------------------------------------------------ |
| * 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_packet.h> |
| #include <sys/socket.h> |
| #include <sys/ioctl.h> |
| #include <net/if.h> |
| #include <net/if_arp.h> |
| |
| #include <vlib/vlib.h> |
| #include <vlib/unix/unix.h> |
| #include <vnet/ip/ip.h> |
| #include <vnet/ethernet/ethernet.h> |
| |
| #include <vnet/devices/af_packet/af_packet.h> |
| |
| #define foreach_af_packet_tx_func_error \ |
| _(FRAME_NOT_READY, "tx frame not ready") \ |
| _(TXRING_EAGAIN, "tx sendto temporary failure") \ |
| _(TXRING_FATAL, "tx sendto fatal failure") \ |
| _(TXRING_OVERRUN, "tx ring overrun") |
| |
| typedef enum |
| { |
| #define _(f,s) AF_PACKET_TX_ERROR_##f, |
| foreach_af_packet_tx_func_error |
| #undef _ |
| AF_PACKET_TX_N_ERROR, |
| } af_packet_tx_func_error_t; |
| |
| static char *af_packet_tx_func_error_strings[] = { |
| #define _(n,s) s, |
| foreach_af_packet_tx_func_error |
| #undef _ |
| }; |
| |
| |
| static u8 * |
| format_af_packet_device_name (u8 * s, va_list * args) |
| { |
| u32 i = va_arg (*args, u32); |
| af_packet_main_t *apm = &af_packet_main; |
| af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, i); |
| |
| s = format (s, "host-%s", apif->host_if_name); |
| return s; |
| } |
| |
| static u8 * |
| format_af_packet_device (u8 * s, va_list * args) |
| { |
| s = format (s, "Linux PACKET socket interface"); |
| return s; |
| } |
| |
| static u8 * |
| format_af_packet_tx_trace (u8 * s, va_list * args) |
| { |
| s = format (s, "Unimplemented..."); |
| return s; |
| } |
| |
| static uword |
| af_packet_interface_tx (vlib_main_t * vm, |
| vlib_node_runtime_t * node, vlib_frame_t * frame) |
| { |
| af_packet_main_t *apm = &af_packet_main; |
| u32 *buffers = vlib_frame_args (frame); |
| u32 n_left = frame->n_vectors; |
| u32 n_sent = 0; |
| vnet_interface_output_runtime_t *rd = (void *) node->runtime_data; |
| af_packet_if_t *apif = |
| pool_elt_at_index (apm->interfaces, rd->dev_instance); |
| int block = 0; |
| u32 block_size = apif->tx_req->tp_block_size; |
| u32 frame_size = apif->tx_req->tp_frame_size; |
| u32 frame_num = apif->tx_req->tp_frame_nr; |
| u8 *block_start = apif->tx_ring + block * block_size; |
| u32 tx_frame = apif->next_tx_frame; |
| struct tpacket2_hdr *tph; |
| u32 frame_not_ready = 0; |
| |
| clib_spinlock_lock_if_init (&apif->lockp); |
| |
| while (n_left > 0) |
| { |
| u32 len; |
| u32 offset = 0; |
| vlib_buffer_t *b0; |
| n_left--; |
| u32 bi = buffers[0]; |
| buffers++; |
| |
| tph = (struct tpacket2_hdr *) (block_start + tx_frame * frame_size); |
| |
| if (PREDICT_FALSE |
| (tph->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING))) |
| { |
| frame_not_ready++; |
| goto next; |
| } |
| |
| do |
| { |
| b0 = vlib_get_buffer (vm, bi); |
| len = b0->current_length; |
| clib_memcpy ((u8 *) tph + |
| TPACKET_ALIGN (sizeof (struct tpacket2_hdr)) + offset, |
| vlib_buffer_get_current (b0), len); |
| offset += len; |
| } |
| while ((bi = |
| (b0->flags & VLIB_BUFFER_NEXT_PRESENT) ? b0->next_buffer : 0)); |
| |
| tph->tp_len = tph->tp_snaplen = offset; |
| tph->tp_status = TP_STATUS_SEND_REQUEST; |
| n_sent++; |
| next: |
| tx_frame = (tx_frame + 1) % frame_num; |
| |
| /* check if we've exhausted the ring */ |
| if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num)) |
| break; |
| } |
| |
| CLIB_MEMORY_BARRIER (); |
| |
| if (PREDICT_TRUE (n_sent)) |
| { |
| apif->next_tx_frame = tx_frame; |
| |
| if (PREDICT_FALSE (sendto (apif->fd, NULL, 0, |
| MSG_DONTWAIT, NULL, 0) == -1)) |
| { |
| /* Uh-oh, drop & move on, but count whether it was fatal or not. |
| * Note that we have no reliable way to properly determine the |
| * disposition of the packets we just enqueued for delivery. |
| */ |
| vlib_error_count (vm, node->node_index, |
| unix_error_is_fatal (errno) ? |
| AF_PACKET_TX_ERROR_TXRING_FATAL : |
| AF_PACKET_TX_ERROR_TXRING_EAGAIN, n_sent); |
| } |
| } |
| |
| clib_spinlock_unlock_if_init (&apif->lockp); |
| |
| if (PREDICT_FALSE (frame_not_ready)) |
| vlib_error_count (vm, node->node_index, |
| AF_PACKET_TX_ERROR_FRAME_NOT_READY, frame_not_ready); |
| |
| if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num)) |
| vlib_error_count (vm, node->node_index, AF_PACKET_TX_ERROR_TXRING_OVERRUN, |
| n_left); |
| |
| vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors); |
| return frame->n_vectors; |
| } |
| |
| static void |
| af_packet_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index, |
| u32 node_index) |
| { |
| af_packet_main_t *apm = &af_packet_main; |
| vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); |
| af_packet_if_t *apif = |
| pool_elt_at_index (apm->interfaces, hw->dev_instance); |
| |
| /* Shut off redirection */ |
| if (node_index == ~0) |
| { |
| apif->per_interface_next_index = node_index; |
| return; |
| } |
| |
| apif->per_interface_next_index = |
| vlib_node_add_next (vlib_get_main (), af_packet_input_node.index, |
| node_index); |
| } |
| |
| static void |
| af_packet_clear_hw_interface_counters (u32 instance) |
| { |
| /* Nothing for now */ |
| } |
| |
| static clib_error_t * |
| af_packet_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, |
| u32 flags) |
| { |
| af_packet_main_t *apm = &af_packet_main; |
| vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index); |
| af_packet_if_t *apif = |
| pool_elt_at_index (apm->interfaces, hw->dev_instance); |
| u32 hw_flags; |
| int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0); |
| struct ifreq ifr; |
| |
| if (0 > fd) |
| { |
| clib_unix_warning ("af_packet_%s could not open socket", |
| apif->host_if_name); |
| return 0; |
| } |
| |
| /* if interface is a bridge ignore */ |
| if (apif->host_if_index < 0) |
| goto error; /* no error */ |
| |
| /* use host_if_index in case host name has changed */ |
| ifr.ifr_ifindex = apif->host_if_index; |
| if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0) |
| { |
| clib_unix_warning ("af_packet_%s ioctl could not retrieve eth name", |
| apif->host_if_name); |
| goto error; |
| } |
| |
| apif->is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0; |
| |
| if ((rv = ioctl (fd, SIOCGIFFLAGS, &ifr)) < 0) |
| { |
| clib_unix_warning ("af_packet_%s error: %d", |
| apif->is_admin_up ? "up" : "down", rv); |
| goto error; |
| } |
| |
| if (apif->is_admin_up) |
| { |
| hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP; |
| ifr.ifr_flags |= IFF_UP; |
| } |
| else |
| { |
| hw_flags = 0; |
| ifr.ifr_flags &= ~IFF_UP; |
| } |
| |
| if ((rv = ioctl (fd, SIOCSIFFLAGS, &ifr)) < 0) |
| { |
| clib_unix_warning ("af_packet_%s error: %d", |
| apif->is_admin_up ? "up" : "down", rv); |
| goto error; |
| } |
| |
| vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags); |
| |
| error: |
| if (0 <= fd) |
| close (fd); |
| |
| return 0; /* no error */ |
| } |
| |
| static clib_error_t * |
| af_packet_subif_add_del_function (vnet_main_t * vnm, |
| u32 hw_if_index, |
| struct vnet_sw_interface_t *st, int is_add) |
| { |
| /* Nothing for now */ |
| return 0; |
| } |
| |
| static clib_error_t *af_packet_set_mac_address_function |
| (struct vnet_hw_interface_t *hi, char *address) |
| { |
| af_packet_main_t *apm = &af_packet_main; |
| af_packet_if_t *apif = |
| pool_elt_at_index (apm->interfaces, hi->dev_instance); |
| int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0); |
| struct ifreq ifr; |
| |
| if (0 > fd) |
| { |
| clib_unix_warning ("af_packet_%s could not open socket", |
| apif->host_if_name); |
| return 0; |
| } |
| |
| /* if interface is a bridge ignore */ |
| if (apif->host_if_index < 0) |
| goto error; /* no error */ |
| |
| /* use host_if_index in case host name has changed */ |
| ifr.ifr_ifindex = apif->host_if_index; |
| if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0) |
| { |
| clib_unix_warning |
| ("af_packet_%s ioctl could not retrieve eth name, error: %d", |
| apif->host_if_name, rv); |
| goto error; |
| } |
| |
| clib_memcpy (ifr.ifr_hwaddr.sa_data, address, 6); |
| ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER; |
| |
| if ((rv = ioctl (fd, SIOCSIFHWADDR, &ifr)) < 0) |
| { |
| clib_unix_warning ("af_packet_%s ioctl could not set mac, error: %d", |
| apif->host_if_name, rv); |
| goto error; |
| } |
| |
| error: |
| |
| if (0 <= fd) |
| close (fd); |
| |
| return 0; /* no error */ |
| } |
| |
| /* *INDENT-OFF* */ |
| VNET_DEVICE_CLASS (af_packet_device_class) = { |
| .name = "af-packet", |
| .tx_function = af_packet_interface_tx, |
| .format_device_name = format_af_packet_device_name, |
| .format_device = format_af_packet_device, |
| .format_tx_trace = format_af_packet_tx_trace, |
| .tx_function_n_errors = AF_PACKET_TX_N_ERROR, |
| .tx_function_error_strings = af_packet_tx_func_error_strings, |
| .rx_redirect_to_node = af_packet_set_interface_next_node, |
| .clear_counters = af_packet_clear_hw_interface_counters, |
| .admin_up_down_function = af_packet_interface_admin_up_down, |
| .subif_add_del_function = af_packet_subif_add_del_function, |
| .mac_addr_change_function = af_packet_set_mac_address_function, |
| }; |
| |
| VLIB_DEVICE_TX_FUNCTION_MULTIARCH (af_packet_device_class, |
| af_packet_interface_tx) |
| /* *INDENT-ON* */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |