diff options
Diffstat (limited to 'src/plugins/af_packet/af_packet.c')
| -rw-r--r-- | src/plugins/af_packet/af_packet.c | 1054 |
1 files changed, 1054 insertions, 0 deletions
diff --git a/src/plugins/af_packet/af_packet.c b/src/plugins/af_packet/af_packet.c new file mode 100644 index 00000000000..69245429918 --- /dev/null +++ b/src/plugins/af_packet/af_packet.c @@ -0,0 +1,1054 @@ +/* + *------------------------------------------------------------------ + * 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 <linux/ethtool.h> +#include <linux/sockios.h> +#include <sys/ioctl.h> +#include <net/if.h> +#include <dirent.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <fcntl.h> + +#include <vppinfra/linux/sysfs.h> +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> +#include <vnet/ip/ip.h> +#include <vnet/devices/netlink.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/interface/rx_queue_funcs.h> +#include <vnet/interface/tx_queue_funcs.h> + +#include <af_packet/af_packet.h> + +af_packet_main_t af_packet_main; + +VNET_HW_INTERFACE_CLASS (af_packet_ip_device_hw_interface_class, static) = { + .name = "af-packet-ip-device", + .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P, +}; + +#define AF_PACKET_DEFAULT_TX_FRAMES_PER_BLOCK 1024 +#define AF_PACKET_DEFAULT_TX_FRAME_SIZE (2048 * 33) // GSO packet of 64KB +#define AF_PACKET_TX_BLOCK_NR 1 + +#define AF_PACKET_DEFAULT_RX_FRAMES_PER_BLOCK_V2 1024 +#define AF_PACKET_DEFAULT_RX_FRAME_SIZE_V2 (2048 * 33) // GSO packet of 64KB +#define AF_PACKET_RX_BLOCK_NR_V2 1 + +#define AF_PACKET_DEFAULT_RX_FRAMES_PER_BLOCK 32 +#define AF_PACKET_DEFAULT_RX_FRAME_SIZE 2048 +#define AF_PACKET_RX_BLOCK_NR 160 + +/*defined in net/if.h but clashes with dpdk headers */ +unsigned int if_nametoindex (const char *ifname); + +#define AF_PACKET_OFFLOAD_FLAG_RXCKSUM (1 << 0) +#define AF_PACKET_OFFLOAD_FLAG_TXCKSUM (1 << 1) +#define AF_PACKET_OFFLOAD_FLAG_SG (1 << 2) +#define AF_PACKET_OFFLOAD_FLAG_TSO (1 << 3) +#define AF_PACKET_OFFLOAD_FLAG_UFO (1 << 4) +#define AF_PACKET_OFFLOAD_FLAG_GSO (1 << 5) +#define AF_PACKET_OFFLOAD_FLAG_GRO (1 << 6) + +#define AF_PACKET_OFFLOAD_FLAG_MASK \ + (AF_PACKET_OFFLOAD_FLAG_RXCKSUM | AF_PACKET_OFFLOAD_FLAG_TXCKSUM | \ + AF_PACKET_OFFLOAD_FLAG_SG | AF_PACKET_OFFLOAD_FLAG_TSO | \ + AF_PACKET_OFFLOAD_FLAG_UFO | AF_PACKET_OFFLOAD_FLAG_GSO | \ + AF_PACKET_OFFLOAD_FLAG_GRO) + +#define AF_PACKET_IOCTL(fd, a, ...) \ + if (ioctl (fd, a, __VA_ARGS__) < 0) \ + { \ + err = clib_error_return_unix (0, "ioctl(" #a ")"); \ + vlib_log_err (af_packet_main.log_class, "%U", format_clib_error, err); \ + goto done; \ + } + +static u32 +af_packet_get_if_capabilities (u8 *host_if_name) +{ + struct ifreq ifr; + struct ethtool_value e; // { __u32 cmd; __u32 data; }; + clib_error_t *err = 0; + int ctl_fd = -1; + u32 oflags = 0; + + if ((ctl_fd = socket (AF_INET, SOCK_STREAM, 0)) == -1) + { + clib_warning ("Cannot open control socket"); + goto done; + } + + clib_memset (&ifr, 0, sizeof (ifr)); + clib_memcpy (ifr.ifr_name, host_if_name, + strlen ((const char *) host_if_name)); + ifr.ifr_data = (void *) &e; + + e.cmd = ETHTOOL_GRXCSUM; + AF_PACKET_IOCTL (ctl_fd, SIOCETHTOOL, &ifr); + if (e.data) + oflags |= AF_PACKET_OFFLOAD_FLAG_RXCKSUM; + + e.cmd = ETHTOOL_GTXCSUM; + AF_PACKET_IOCTL (ctl_fd, SIOCETHTOOL, &ifr); + if (e.data) + oflags |= AF_PACKET_OFFLOAD_FLAG_TXCKSUM; + + e.cmd = ETHTOOL_GTSO; + AF_PACKET_IOCTL (ctl_fd, SIOCETHTOOL, &ifr); + if (e.data) + oflags |= AF_PACKET_OFFLOAD_FLAG_TSO; + + e.cmd = ETHTOOL_GGSO; + AF_PACKET_IOCTL (ctl_fd, SIOCETHTOOL, &ifr); + if (e.data) + oflags |= AF_PACKET_OFFLOAD_FLAG_GSO; + + e.cmd = ETHTOOL_GGRO; + AF_PACKET_IOCTL (ctl_fd, SIOCETHTOOL, &ifr); + if (e.data) + oflags |= AF_PACKET_OFFLOAD_FLAG_GRO; + +done: + if (ctl_fd != -1) + close (ctl_fd); + + return oflags; +} + +static clib_error_t * +af_packet_eth_set_max_frame_size (vnet_main_t *vnm, vnet_hw_interface_t *hi, + u32 frame_size) +{ + clib_error_t *error, *rv; + af_packet_main_t *apm = &af_packet_main; + af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, hi->dev_instance); + + error = vnet_netlink_set_link_mtu (apif->host_if_index, + frame_size + hi->frame_overhead); + + if (error) + { + vlib_log_err (apm->log_class, "netlink failed to change MTU: %U", + format_clib_error, error); + rv = vnet_error (VNET_ERR_SYSCALL_ERROR_1, "netlink error: %U", + format_clib_error, error); + clib_error_free (error); + return rv; + } + else + apif->host_mtu = frame_size + hi->frame_overhead; + return 0; +} + +static int +af_packet_read_mtu (af_packet_if_t *apif) +{ + af_packet_main_t *apm = &af_packet_main; + clib_error_t *error; + error = vnet_netlink_get_link_mtu (apif->host_if_index, &apif->host_mtu); + if (error) + { + vlib_log_err (apm->log_class, "netlink failed to get MTU: %U", + format_clib_error, error); + clib_error_free (error); + return VNET_API_ERROR_SYSCALL_ERROR_1; + } + return 0; +} + +static clib_error_t * +af_packet_fd_read_ready (clib_file_t * uf) +{ + vnet_main_t *vnm = vnet_get_main (); + + /* Schedule the rx node */ + vnet_hw_if_rx_queue_set_int_pending (vnm, uf->private_data); + return 0; +} + +static clib_error_t * +af_packet_fd_error (clib_file_t *uf) +{ + af_packet_main_t *apm = &af_packet_main; + clib_error_t *err = 0; + u64 u64; + + int ret = read (uf->file_descriptor, (char *) &u64, sizeof (u64)); + + if (ret < 0) + { + err = clib_error_return_unix (0, ""); + vlib_log_notice (apm->log_class, "fd %u %U", uf->file_descriptor, + format_clib_error, err); + clib_error_free (err); + } + + 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 void +af_packet_set_rx_queues (vlib_main_t *vm, af_packet_if_t *apif) +{ + vnet_main_t *vnm = vnet_get_main (); + af_packet_queue_t *rx_queue; + + vnet_hw_if_set_input_node (vnm, apif->hw_if_index, + af_packet_input_node.index); + + vec_foreach (rx_queue, apif->rx_queues) + { + rx_queue->queue_index = vnet_hw_if_register_rx_queue ( + vnm, apif->hw_if_index, rx_queue->queue_id, VNET_HW_IF_RXQ_THREAD_ANY); + + { + clib_file_t template = { 0 }; + template.read_function = af_packet_fd_read_ready; + template.error_function = af_packet_fd_error; + template.file_descriptor = rx_queue->fd; + template.private_data = rx_queue->queue_index; + template.description = + format (0, "%U queue %u", format_af_packet_device_name, + apif->dev_instance, rx_queue->queue_id); + rx_queue->clib_file_index = clib_file_add (&file_main, &template); + } + vnet_hw_if_set_rx_queue_file_index (vnm, rx_queue->queue_index, + rx_queue->clib_file_index); + vnet_hw_if_set_rx_queue_mode (vnm, rx_queue->queue_index, + VNET_HW_IF_RX_MODE_INTERRUPT); + rx_queue->mode = VNET_HW_IF_RX_MODE_INTERRUPT; + } + vnet_hw_if_update_runtime_data (vnm, apif->hw_if_index); +} + +static void +af_packet_set_tx_queues (vlib_main_t *vm, af_packet_if_t *apif) +{ + vnet_main_t *vnm = vnet_get_main (); + af_packet_main_t *apm = &af_packet_main; + af_packet_queue_t *tx_queue; + + vec_foreach (tx_queue, apif->tx_queues) + { + tx_queue->queue_index = vnet_hw_if_register_tx_queue ( + vnm, apif->hw_if_index, tx_queue->queue_id); + } + + if (apif->num_txqs == 0) + { + vlib_log_err (apm->log_class, "Interface %U has 0 txq", + format_vnet_hw_if_index_name, vnm, apif->hw_if_index); + return; + } + + for (u32 j = 0; j < vlib_get_n_threads (); j++) + { + u32 qi = apif->tx_queues[j % apif->num_txqs].queue_index; + vnet_hw_if_tx_queue_assign_thread (vnm, qi, j); + } + + vnet_hw_if_update_runtime_data (vnm, apif->hw_if_index); +} + +static int +create_packet_sock (int host_if_index, tpacket_req_u_t *rx_req, + tpacket_req_u_t *tx_req, int *fd, af_packet_ring_t *ring, + u32 fanout_id, af_packet_if_flags_t *flags, int ver) +{ + af_packet_main_t *apm = &af_packet_main; + struct sockaddr_ll sll; + socklen_t req_sz = sizeof (tpacket_req3_t); + int ret; + u32 ring_sz = 0; + + if ((*fd = socket (AF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0) + { + vlib_log_err (apm->log_class, + "Failed to create AF_PACKET socket: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + + /* bind before rx ring is cfged so we don't receive packets from other interfaces */ + clib_memset (&sll, 0, sizeof (sll)); + sll.sll_family = PF_PACKET; + sll.sll_protocol = htons (ETH_P_ALL); + sll.sll_ifindex = host_if_index; + if (bind (*fd, (struct sockaddr *) &sll, sizeof (sll)) < 0) + { + vlib_log_err (apm->log_class, + "Failed to bind rx packet socket: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + + if (setsockopt (*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof (ver)) < 0) + { + vlib_log_err (apm->log_class, + "Failed to set rx packet interface version: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + + int opt = 1; + if (setsockopt (*fd, SOL_PACKET, PACKET_LOSS, &opt, sizeof (opt)) < 0) + { + vlib_log_err ( + apm->log_class, + "Failed to set packet tx ring error handling option: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + + if (*flags & AF_PACKET_IF_FLAGS_CKSUM_GSO) + { + + int opt2 = 1; + if (setsockopt (*fd, SOL_PACKET, PACKET_VNET_HDR, &opt2, sizeof (opt2)) < + 0) + { + // remove the flag + *flags &= ~AF_PACKET_IF_FLAGS_CKSUM_GSO; + vlib_log_debug (apm->log_class, + "Failed to set packet vnet hdr error handling " + "option: %s (errno %d)", + strerror (errno), errno); + } + } + +#if defined(PACKET_QDISC_BYPASS) + if (*flags & AF_PACKET_IF_FLAGS_QDISC_BYPASS) + /* Introduced with Linux 3.14 so the ifdef should eventually be removed */ + if (setsockopt (*fd, SOL_PACKET, PACKET_QDISC_BYPASS, &opt, sizeof (opt)) < + 0) + { + // remove the flag + *flags &= ~AF_PACKET_IF_FLAGS_QDISC_BYPASS; + vlib_log_debug (apm->log_class, + "Failed to set qdisc bypass error " + "handling option: %s (errno %d)", + strerror (errno), errno); + } +#endif + + if (rx_req) + { + if (*flags & AF_PACKET_IF_FLAGS_FANOUT) + { + int fanout = ((fanout_id & 0xffff) | ((PACKET_FANOUT_HASH) << 16)); + if (setsockopt (*fd, SOL_PACKET, PACKET_FANOUT, &fanout, + sizeof (fanout)) < 0) + { + // remove the flag + *flags &= ~AF_PACKET_IF_FLAGS_FANOUT; + vlib_log_err (apm->log_class, + "Failed to set fanout options: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + } + if (ver == TPACKET_V2) + { + req_sz = sizeof (tpacket_req_t); + ring_sz += rx_req->req.tp_block_size * rx_req->req.tp_block_nr; + } + else + ring_sz += rx_req->req3.tp_block_size * rx_req->req3.tp_block_nr; + if (setsockopt (*fd, SOL_PACKET, PACKET_RX_RING, rx_req, req_sz) < 0) + { + vlib_log_err (apm->log_class, + "Failed to set packet rx ring options: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + } + + if (tx_req) + { + if (ver == TPACKET_V2) + { + req_sz = sizeof (tpacket_req_t); + ring_sz += tx_req->req.tp_block_size * tx_req->req.tp_block_nr; + } + else + ring_sz += tx_req->req3.tp_block_size * tx_req->req3.tp_block_nr; + if (setsockopt (*fd, SOL_PACKET, PACKET_TX_RING, tx_req, req_sz) < 0) + { + vlib_log_err (apm->log_class, + "Failed to set packet tx ring options: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + } + ring->ring_start_addr = mmap (NULL, ring_sz, PROT_READ | PROT_WRITE, + MAP_SHARED | MAP_LOCKED, *fd, 0); + if (ring->ring_start_addr == MAP_FAILED) + { + vlib_log_err (apm->log_class, "mmap failure: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + + ring->ring_size = ring_sz; + + return 0; +error: + if (*fd >= 0) + { + close (*fd); + *fd = -1; + } + return ret; +} + +int +af_packet_queue_init (vlib_main_t *vm, af_packet_if_t *apif, + af_packet_create_if_arg_t *arg, + af_packet_queue_t *rx_queue, af_packet_queue_t *tx_queue, + u8 queue_id) +{ + af_packet_main_t *apm = &af_packet_main; + tpacket_req_u_t *rx_req = 0; + tpacket_req_u_t *tx_req = 0; + int ret, fd = -1; + af_packet_ring_t ring = { 0 }; + u8 *ring_addr = 0; + u32 rx_frames_per_block, tx_frames_per_block; + u32 rx_frame_size, tx_frame_size; + u32 i = 0; + + if (rx_queue) + { + rx_frames_per_block = arg->rx_frames_per_block ? + arg->rx_frames_per_block : + ((apif->version == TPACKET_V3) ? + AF_PACKET_DEFAULT_RX_FRAMES_PER_BLOCK : + AF_PACKET_DEFAULT_RX_FRAMES_PER_BLOCK_V2); + + rx_frame_size = + arg->rx_frame_size ? + arg->rx_frame_size : + ((apif->version == TPACKET_V3) ? AF_PACKET_DEFAULT_RX_FRAME_SIZE : + AF_PACKET_DEFAULT_RX_FRAME_SIZE_V2); + vec_validate (rx_queue->rx_req, 0); + rx_queue->rx_req->req.tp_block_size = + rx_frame_size * rx_frames_per_block; + rx_queue->rx_req->req.tp_frame_size = rx_frame_size; + rx_queue->rx_req->req.tp_block_nr = (apif->version == TPACKET_V3) ? + AF_PACKET_RX_BLOCK_NR : + AF_PACKET_RX_BLOCK_NR_V2; + rx_queue->rx_req->req.tp_frame_nr = + rx_queue->rx_req->req.tp_block_nr * rx_frames_per_block; + if (apif->version == TPACKET_V3) + { + rx_queue->rx_req->req3.tp_retire_blk_tov = 1; // 1 ms block timout + rx_queue->rx_req->req3.tp_feature_req_word = 0; + rx_queue->rx_req->req3.tp_sizeof_priv = 0; + } + rx_req = rx_queue->rx_req; + } + if (tx_queue) + { + tx_frames_per_block = arg->tx_frames_per_block ? + arg->tx_frames_per_block : + AF_PACKET_DEFAULT_TX_FRAMES_PER_BLOCK; + tx_frame_size = arg->tx_frame_size ? arg->tx_frame_size : + AF_PACKET_DEFAULT_TX_FRAME_SIZE; + + vec_validate (tx_queue->tx_req, 0); + tx_queue->tx_req->req.tp_block_size = + tx_frame_size * tx_frames_per_block; + tx_queue->tx_req->req.tp_frame_size = tx_frame_size; + tx_queue->tx_req->req.tp_block_nr = AF_PACKET_TX_BLOCK_NR; + tx_queue->tx_req->req.tp_frame_nr = + AF_PACKET_TX_BLOCK_NR * tx_frames_per_block; + if (apif->version == TPACKET_V3) + { + tx_queue->tx_req->req3.tp_retire_blk_tov = 0; + tx_queue->tx_req->req3.tp_sizeof_priv = 0; + tx_queue->tx_req->req3.tp_feature_req_word = 0; + } + tx_req = tx_queue->tx_req; + } + + if (rx_queue || tx_queue) + { + ret = + create_packet_sock (apif->host_if_index, rx_req, tx_req, &fd, &ring, + apif->dev_instance, &arg->flags, apif->version); + + if (ret != 0) + goto error; + + vec_add1 (apif->fds, fd); + vec_add1 (apif->rings, ring); + ring_addr = ring.ring_start_addr; + } + + if (rx_queue) + { + rx_queue->fd = fd; + vec_validate (rx_queue->rx_ring, rx_queue->rx_req->req.tp_block_nr - 1); + vec_foreach_index (i, rx_queue->rx_ring) + { + rx_queue->rx_ring[i] = + ring_addr + i * rx_queue->rx_req->req.tp_block_size; + } + + rx_queue->next_rx_block = 0; + rx_queue->queue_id = queue_id; + rx_queue->is_rx_pending = 0; + ring_addr = ring_addr + rx_queue->rx_req->req.tp_block_size * + rx_queue->rx_req->req.tp_block_nr; + } + + if (tx_queue) + { + tx_queue->fd = fd; + vec_validate (tx_queue->tx_ring, tx_queue->tx_req->req.tp_block_nr - 1); + vec_foreach_index (i, tx_queue->tx_ring) + { + tx_queue->tx_ring[i] = + ring_addr + i * tx_queue->tx_req->req.tp_block_size; + } + + tx_queue->next_tx_frame = 0; + tx_queue->queue_id = queue_id; + tx_queue->is_tx_pending = 0; + clib_spinlock_init (&tx_queue->lockp); + } + + return 0; +error: + vlib_log_err (apm->log_class, "Failed to set queue %u error", queue_id); + if (rx_queue) + vec_free (rx_queue->rx_req); + if (tx_queue) + vec_free (tx_queue->tx_req); + return ret; +} + +int +af_packet_device_init (vlib_main_t *vm, af_packet_if_t *apif, + af_packet_create_if_arg_t *args) +{ + af_packet_main_t *apm = &af_packet_main; + af_packet_queue_t *rx_queue = 0; + af_packet_queue_t *tx_queue = 0; + u16 nq = clib_min (args->num_rxqs, args->num_txqs); + u16 i = 0; + int ret = 0; + + // enable fanout feature for multi-rxqs + if (args->num_rxqs > 1) + args->flags |= AF_PACKET_IF_FLAGS_FANOUT; + + vec_validate (apif->rx_queues, args->num_rxqs - 1); + vec_validate (apif->tx_queues, args->num_txqs - 1); + + for (; i < nq; i++) + { + rx_queue = vec_elt_at_index (apif->rx_queues, i); + tx_queue = vec_elt_at_index (apif->tx_queues, i); + ret = af_packet_queue_init (vm, apif, args, rx_queue, tx_queue, i); + if (ret != 0) + goto error; + } + + if (args->num_rxqs > args->num_txqs) + { + for (; i < args->num_rxqs; i++) + { + rx_queue = vec_elt_at_index (apif->rx_queues, i); + ret = af_packet_queue_init (vm, apif, args, rx_queue, 0, i); + if (ret != 0) + goto error; + } + } + else if (args->num_txqs > args->num_rxqs) + { + for (; i < args->num_txqs; i++) + { + tx_queue = vec_elt_at_index (apif->tx_queues, i); + ret = af_packet_queue_init (vm, apif, args, 0, tx_queue, i); + if (ret != 0) + goto error; + } + } + + apif->num_rxqs = args->num_rxqs; + apif->num_txqs = args->num_txqs; + + return 0; +error: + vlib_log_err (apm->log_class, "Failed to init device error"); + return ret; +} + +int +af_packet_create_if (af_packet_create_if_arg_t *arg) +{ + af_packet_main_t *apm = &af_packet_main; + vlib_main_t *vm = vlib_get_main (); + int fd2 = -1; + struct ifreq ifr; + af_packet_if_t *apif = 0; + u8 hw_addr[6]; + vnet_sw_interface_t *sw; + vnet_main_t *vnm = vnet_get_main (); + vnet_hw_if_caps_t caps = VNET_HW_IF_CAP_INT_MODE; + uword *p; + uword if_index; + u8 *host_if_name_dup = 0; + int host_if_index = -1; + int ret = 0; + u32 oflags = 0, i = 0; + + p = mhash_get (&apm->if_index_by_host_if_name, arg->host_if_name); + if (p) + { + apif = vec_elt_at_index (apm->interfaces, p[0]); + arg->sw_if_index = apif->sw_if_index; + return VNET_API_ERROR_IF_ALREADY_EXISTS; + } + + host_if_name_dup = vec_dup (arg->host_if_name); + + /* + * make sure host side of interface is 'UP' before binding AF_PACKET + * socket on it. + */ + if ((fd2 = socket (AF_UNIX, SOCK_DGRAM, 0)) < 0) + { + vlib_log_debug (apm->log_class, + "Failed to create AF_UNIX socket: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + + clib_memcpy (ifr.ifr_name, (const char *) arg->host_if_name, + vec_len (arg->host_if_name)); + if (ioctl (fd2, SIOCGIFINDEX, &ifr) < 0) + { + vlib_log_debug ( + apm->log_class, + "Failed to retrieve the interface (%s) index: %s (errno %d)", + arg->host_if_name, strerror (errno), errno); + ret = VNET_API_ERROR_INVALID_INTERFACE; + goto error; + } + + host_if_index = ifr.ifr_ifindex; + if (ioctl (fd2, SIOCGIFFLAGS, &ifr) < 0) + { + vlib_log_debug (apm->log_class, + "Failed to get the active flag: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + + if (!(ifr.ifr_flags & IFF_UP)) + { + ifr.ifr_flags |= IFF_UP; + if (ioctl (fd2, SIOCSIFFLAGS, &ifr) < 0) + { + vlib_log_debug (apm->log_class, + "Failed to set the active flag: %s (errno %d)", + strerror (errno), errno); + ret = VNET_API_ERROR_SYSCALL_ERROR_1; + goto error; + } + } + + if (fd2 > -1) + { + close (fd2); + fd2 = -1; + } + + // check the host interface capabilities + oflags = af_packet_get_if_capabilities (arg->host_if_name); + + ret = is_bridge (arg->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->dev_instance = if_index; + apif->host_if_index = host_if_index; + apif->host_if_name = host_if_name_dup; + apif->per_interface_next_index = ~0; + apif->mode = arg->mode; + apif->host_interface_oflags = oflags; + + if (arg->is_v2) + apif->version = TPACKET_V2; + else + apif->version = TPACKET_V3; + + ret = af_packet_device_init (vm, apif, arg); + if (ret != 0) + goto error; + + ret = af_packet_read_mtu (apif); + if (ret != 0) + goto error; + + + if (apif->mode != AF_PACKET_IF_MODE_IP) + { + vnet_eth_interface_registration_t eir = {}; + /*use configured or generate random MAC address */ + if (arg->hw_addr) + clib_memcpy (hw_addr, arg->hw_addr, 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; + } + + eir.dev_class_index = af_packet_device_class.index; + eir.dev_instance = apif->dev_instance; + eir.address = hw_addr; + eir.cb.set_max_frame_size = af_packet_eth_set_max_frame_size; + apif->hw_if_index = vnet_eth_register_interface (vnm, &eir); + } + else + { + apif->hw_if_index = vnet_register_interface ( + vnm, af_packet_device_class.index, apif->dev_instance, + af_packet_ip_device_hw_interface_class.index, apif->dev_instance); + } + + sw = vnet_get_hw_sw_interface (vnm, apif->hw_if_index); + apif->sw_if_index = sw->sw_if_index; + + af_packet_set_rx_queues (vm, apif); + af_packet_set_tx_queues (vm, apif); + + if (arg->flags & AF_PACKET_IF_FLAGS_FANOUT) + apif->is_fanout_enabled = 1; + + apif->is_qdisc_bypass_enabled = + (arg->flags & AF_PACKET_IF_FLAGS_QDISC_BYPASS); + + if (arg->flags & AF_PACKET_IF_FLAGS_CKSUM_GSO) + { + if (apif->host_interface_oflags & AF_PACKET_OFFLOAD_FLAG_TXCKSUM) + { + apif->is_cksum_gso_enabled = 1; + caps |= VNET_HW_IF_CAP_TX_IP4_CKSUM | VNET_HW_IF_CAP_TX_TCP_CKSUM | + VNET_HW_IF_CAP_TX_UDP_CKSUM; + } + + if (apif->host_interface_oflags & AF_PACKET_OFFLOAD_FLAG_GSO) + { + apif->is_cksum_gso_enabled = 1; + caps |= VNET_HW_IF_CAP_TCP_GSO | VNET_HW_IF_CAP_TX_IP4_CKSUM | + VNET_HW_IF_CAP_TX_TCP_CKSUM | VNET_HW_IF_CAP_TX_UDP_CKSUM; + } + } + vnet_hw_if_set_caps (vnm, apif->hw_if_index, caps); + vnet_hw_interface_set_flags (vnm, apif->hw_if_index, + VNET_HW_INTERFACE_FLAG_LINK_UP); + + mhash_set_mem (&apm->if_index_by_host_if_name, host_if_name_dup, &if_index, + 0); + arg->sw_if_index = apif->sw_if_index; + + return 0; + +error: + if (fd2 > -1) + { + close (fd2); + fd2 = -1; + } + + vec_free (host_if_name_dup); + + if (apif) + { + vec_foreach_index (i, apif->fds) + if (apif->fds[i] != -1) + close (apif->fds[i]); + vec_free (apif->fds); + memset (apif, 0, sizeof (*apif)); + pool_put (apm->interfaces, apif); + } + return ret; +} + +static int +af_packet_rx_queue_free (af_packet_if_t *apif, af_packet_queue_t *rx_queue) +{ + clib_file_del_by_index (&file_main, rx_queue->clib_file_index); + rx_queue->fd = -1; + rx_queue->rx_ring = NULL; + vec_free (rx_queue->rx_req); + rx_queue->rx_req = NULL; + return 0; +} + +static int +af_packet_tx_queue_free (af_packet_if_t *apif, af_packet_queue_t *tx_queue) +{ + tx_queue->fd = -1; + clib_spinlock_free (&tx_queue->lockp); + tx_queue->tx_ring = NULL; + vec_free (tx_queue->tx_req); + tx_queue->tx_req = NULL; + return 0; +} + +static int +af_packet_ring_free (af_packet_if_t *apif, af_packet_ring_t *ring) +{ + af_packet_main_t *apm = &af_packet_main; + + if (ring) + { + // FIXME: unmap the memory + if (munmap (ring->ring_start_addr, ring->ring_size)) + vlib_log_warn (apm->log_class, + "Host interface %s could not free ring %p of size %u", + apif->host_if_name, ring->ring_start_addr, + ring->ring_size); + else + ring->ring_start_addr = 0; + } + + return 0; +} + +int +af_packet_delete_if (u8 *host_if_name) +{ + vnet_main_t *vnm = vnet_get_main (); + af_packet_main_t *apm = &af_packet_main; + af_packet_if_t *apif; + af_packet_queue_t *rx_queue; + af_packet_queue_t *tx_queue; + af_packet_ring_t *ring; + uword *p; + u32 i = 0; + + p = mhash_get (&apm->if_index_by_host_if_name, host_if_name); + if (p == NULL) + { + vlib_log_warn (apm->log_class, "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]); + + /* bring down the interface */ + vnet_hw_interface_set_flags (vnm, apif->hw_if_index, 0); + if (apif->mode != AF_PACKET_IF_MODE_IP) + ethernet_delete_interface (vnm, apif->hw_if_index); + else + vnet_delete_hw_interface (vnm, apif->hw_if_index); + + /* clean up */ + vec_foreach_index (i, apif->fds) + if (apif->fds[i] != -1) + close (apif->fds[i]); + vec_foreach (rx_queue, apif->rx_queues) + af_packet_rx_queue_free (apif, rx_queue); + vec_foreach (tx_queue, apif->tx_queues) + af_packet_tx_queue_free (apif, tx_queue); + vec_foreach (ring, apif->rings) + af_packet_ring_free (apif, ring); + + vec_free (apif->fds); + apif->fds = NULL; + vec_free (apif->rx_queues); + apif->rx_queues = NULL; + vec_free (apif->tx_queues); + apif->tx_queues = NULL; + vec_free (apif->rings); + apif->rings = 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, p); + + memset (apif, 0, sizeof (*apif)); + pool_put (apm->interfaces, apif); + + return 0; +} + +int +af_packet_enable_disable_qdisc_bypass (u32 sw_if_index, u8 enable_disable) +{ + af_packet_main_t *apm = &af_packet_main; + af_packet_if_t *apif; + vnet_main_t *vnm = vnet_get_main (); + vnet_hw_interface_t *hw; + u32 i; + + hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index); + + if (hw->dev_class_index != af_packet_device_class.index) + return VNET_API_ERROR_INVALID_INTERFACE; + + apif = pool_elt_at_index (apm->interfaces, hw->dev_instance); + +#if defined(PACKET_QDISC_BYPASS) + vec_foreach_index (i, apif->fds) + { + if (enable_disable) + { + int opt = 1; + + /* Introduced with Linux 3.14 so the ifdef should eventually be + * removed */ + if (setsockopt (apif->fds[i], SOL_PACKET, PACKET_QDISC_BYPASS, &opt, + sizeof (opt)) < 0) + { + vlib_log_err (apm->log_class, + "Failed to enable qdisc bypass error " + "handling option: %s (errno %d)", + strerror (errno), errno); + } + apif->is_qdisc_bypass_enabled = 1; + } + else + { + int opt = 0; + if (setsockopt (apif->fds[i], SOL_PACKET, PACKET_QDISC_BYPASS, &opt, + sizeof (opt)) < 0) + { + vlib_log_err (apm->log_class, + "Failed to disable qdisc bypass error " + "handling option: %s (errno %d)", + strerror (errno), errno); + } + apif->is_qdisc_bypass_enabled = 0; + } + } + +#endif + return 0; +} + +int +af_packet_set_l4_cksum_offload (u32 sw_if_index, u8 set) +{ + // deprecated ... + return 0; +} + +int +af_packet_dump_ifs (af_packet_if_detail_t ** out_af_packet_ifs) +{ + af_packet_main_t *apm = &af_packet_main; + af_packet_if_t *apif; + af_packet_if_detail_t *r_af_packet_ifs = NULL; + af_packet_if_detail_t *af_packet_if = NULL; + + pool_foreach (apif, apm->interfaces) + { + vec_add2 (r_af_packet_ifs, af_packet_if, 1); + af_packet_if->sw_if_index = apif->sw_if_index; + if (apif->host_if_name) + { + clib_memcpy (af_packet_if->host_if_name, apif->host_if_name, + MIN (ARRAY_LEN (af_packet_if->host_if_name) - 1, + strlen ((const char *) apif->host_if_name))); + } + } + + *out_af_packet_ifs = r_af_packet_ifs; + + 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 (); + + clib_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); + + apm->log_class = vlib_log_register_class ("af_packet", 0); + vlib_log_debug (apm->log_class, "initialized"); + + return 0; +} + +VLIB_INIT_FUNCTION (af_packet_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |