/* *------------------------------------------------------------------ * 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 <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/ethernet/ethernet.h> #include <vnet/devices/af_packet/af_packet.h> af_packet_main_t af_packet_main; #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) /*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 = clib_sysfs_write ((char *) s, "%d", hi->max_packet_bytes); vec_free (s); if (error) { vlib_log_err (apm->log_class, "sysfs write failed to change 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) { 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) { af_packet_main_t *apm = &af_packet_main; 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) { vlib_log_debug (apm->log_class, "Failed to create socket"); 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 ((err = bind (*fd, (struct sockaddr *) &sll, sizeof (sll))) < 0) { vlib_log_debug (apm->log_class, "Failed to bind rx packet socket (error %d)", err); ret = VNET_API_ERROR_SYSCALL_ERROR_1; goto error; } if ((err = setsockopt (*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof (ver))) < 0) { vlib_log_debug (apm->log_class, "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) { vlib_log_debug (apm->log_class, "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) { vlib_log_debug (apm->log_class, "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) { vlib_log_debug (apm->log_class, "Failed to set packet tx 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) { vlib_log_debug (apm->log_class, "mmap failure"); 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, fd2 = -1; struct tpacket_req *rx_req = 0; struct tpacket_req *tx_req = 0; struct ifreq ifr; 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) { apif = vec_elt_at_index (apm->interfaces, p[0]); *sw_if_index = apif->sw_if_index; return VNET_API_ERROR_IF_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; /* * 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 socket"); ret = VNET_API_ERROR_SYSCALL_ERROR_1; goto error; } clib_memcpy (ifr.ifr_name, (const char *) host_if_name, vec_len (host_if_name)); if ((ret = ioctl (fd2, SIOCGIFINDEX, &ifr)) < 0) { vlib_log_debug (apm->log_class, "af_packet_create error: %d", ret); close (fd2); return VNET_API_ERROR_INVALID_INTERFACE; } host_if_index = ifr.ifr_ifindex; if ((ret = ioctl (fd2, SIOCGIFFLAGS, &ifr)) < 0) { vlib_log_warn (apm->log_class, "af_packet_create error: %d", ret); goto error; } if (!(ifr.ifr_flags & IFF_UP)) { ifr.ifr_flags |= IFF_UP; if ((ret = ioctl (fd2, SIOCSIFFLAGS, &ifr)) < 0) { vlib_log_warn (apm->log_class, "af_packet_create error: %d", ret); goto error; } } if (fd2 > -1) close (fd2); 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; template.description = format (0, "%U", format_af_packet_device_name, if_index); 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) { clib_memset (apif, 0, sizeof (*apif)); pool_put (apm->interfaces, apif); vlib_log_err (apm->log_class, "Unable to register interface: %U", format_clib_error, error); clib_error_free (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: if (fd2 > -1) close (fd2); 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) { 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]); 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)) vlib_log_warn (apm->log_class, "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; } int af_packet_set_l4_cksum_offload (vlib_main_t * vm, u32 sw_if_index, u8 set) { vnet_main_t *vnm = vnet_get_main (); vnet_hw_interface_t *hw; hw = vnet_get_sup_hw_interface (vnm, sw_if_index); if (hw->dev_class_index != af_packet_device_class.index) return VNET_API_ERROR_INVALID_INTERFACE; if (set) hw->flags &= ~VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD; else hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD; 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; vec_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: */