diff options
Diffstat (limited to 'vnet/vnet/unix/tuntap.c')
| -rw-r--r-- | vnet/vnet/unix/tuntap.c | 1000 |
1 files changed, 0 insertions, 1000 deletions
diff --git a/vnet/vnet/unix/tuntap.c b/vnet/vnet/unix/tuntap.c deleted file mode 100644 index 4a5dd676a68..00000000000 --- a/vnet/vnet/unix/tuntap.c +++ /dev/null @@ -1,1000 +0,0 @@ -/* - *------------------------------------------------------------------ - * tuntap.c - kernel stack (reverse) punt/inject path - * - * Copyright (c) 2009 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. - *------------------------------------------------------------------ - */ -/** - * @file - * @brief TunTap Kernel stack (reverse) punt/inject path. - * - * This driver runs in one of two distinct modes: - * - "punt/inject" mode, where we send pkts not otherwise processed - * by the forwarding to the Linux kernel stack, and - * - * - "normal interface" mode, where we treat the Linux kernel stack - * as a peer. - * - * By default, we select punt/inject mode. - */ - -#include <fcntl.h> /* for open */ -#include <sys/ioctl.h> -#include <sys/socket.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <sys/uio.h> /* for iovec */ -#include <netinet/in.h> - -#include <linux/if_arp.h> -#include <linux/if_tun.h> - -#include <vlib/vlib.h> -#include <vlib/unix/unix.h> - -#include <vnet/ip/ip.h> - -#include <vnet/ethernet/ethernet.h> -#include <vnet/devices/devices.h> -#include <vnet/feature/feature.h> - -static vnet_device_class_t tuntap_dev_class; -static vnet_hw_interface_class_t tuntap_interface_class; - -static void tuntap_punt_frame (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame); -static void tuntap_nopunt_frame (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame); - -typedef struct { - u32 sw_if_index; - u8 is_v6; - u8 addr[16]; -} subif_address_t; - -/** - * @brief TUNTAP node main state - */ -typedef struct { - /** Vector of iovecs for readv/writev calls. */ - struct iovec * iovecs; - - /** Vector of VLIB rx buffers to use. We allocate them in blocks - of VLIB_FRAME_SIZE (256). */ - u32 * rx_buffers; - - /** File descriptors for /dev/net/tun and provisioning socket. */ - int dev_net_tun_fd, dev_tap_fd; - - /** Create a "tap" [ethernet] encaps device */ - int is_ether; - - /** 1 if a "normal" routed intfc, 0 if a punt/inject interface */ - - int have_normal_interface; - - /** tap device destination MAC address. Required, or Linux drops pkts */ - u8 ether_dst_mac[6]; - - /** Interface MTU in bytes and # of default sized buffers. */ - u32 mtu_bytes, mtu_buffers; - - /** Linux interface name for tun device. */ - char * tun_name; - - /** Pool of subinterface addresses */ - subif_address_t *subifs; - - /** Hash for subif addresses */ - mhash_t subif_mhash; - - /** Unix file index */ - u32 unix_file_index; - - /** For the "normal" interface, if configured */ - u32 hw_if_index, sw_if_index; - -} tuntap_main_t; - -static tuntap_main_t tuntap_main = { - .tun_name = "vnet", - - /** Suitable defaults for an Ethernet-like tun/tap device */ - .mtu_bytes = 4096 + 256, -}; - -/** - * @brief tuntap_tx - * @node tuntap-tx - * - * Output node, writes the buffers comprising the incoming frame - * to the tun/tap device, aka hands them to the Linux kernel stack. - * - * @param *vm - vlib_main_t - * @param *node - vlib_node_runtime_t - * @param *frame - vlib_frame_t - * - * @return rc - uword - * - */ -static uword -tuntap_tx (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - u32 * buffers = vlib_frame_args (frame); - uword n_packets = frame->n_vectors; - tuntap_main_t * tm = &tuntap_main; - vnet_main_t *vnm = vnet_get_main (); - vnet_interface_main_t *im = &vnm->interface_main; - u32 n_bytes = 0; - int i; - - for (i = 0; i < n_packets; i++) - { - struct iovec * iov; - vlib_buffer_t * b; - uword l; - - b = vlib_get_buffer (vm, buffers[i]); - - if (tm->is_ether && (!tm->have_normal_interface)) - { - vlib_buffer_reset(b); - clib_memcpy (vlib_buffer_get_current (b), tm->ether_dst_mac, 6); - } - - /* Re-set iovecs if present. */ - if (tm->iovecs) - _vec_len (tm->iovecs) = 0; - - /** VLIB buffer chain -> Unix iovec(s). */ - vec_add2 (tm->iovecs, iov, 1); - iov->iov_base = b->data + b->current_data; - iov->iov_len = l = b->current_length; - - if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) - { - do { - b = vlib_get_buffer (vm, b->next_buffer); - - vec_add2 (tm->iovecs, iov, 1); - - iov->iov_base = b->data + b->current_data; - iov->iov_len = b->current_length; - l += b->current_length; - } while (b->flags & VLIB_BUFFER_NEXT_PRESENT); - } - - if (writev (tm->dev_net_tun_fd, tm->iovecs, vec_len (tm->iovecs)) < l) - clib_unix_warning ("writev"); - - n_bytes += l; - } - - /* Update tuntap interface output stats. */ - vlib_increment_combined_counter (im->combined_sw_if_counters - + VNET_INTERFACE_COUNTER_TX, - vm->cpu_index, - tm->sw_if_index, n_packets, n_bytes); - - - /** The normal interface path flattens the buffer chain */ - if (tm->have_normal_interface) - vlib_buffer_free_no_next (vm, buffers, n_packets); - else - vlib_buffer_free (vm, buffers, n_packets); - - return n_packets; -} - -VLIB_REGISTER_NODE (tuntap_tx_node,static) = { - .function = tuntap_tx, - .name = "tuntap-tx", - .type = VLIB_NODE_TYPE_INTERNAL, - .vector_size = 4, -}; - -/** - * @brief TUNTAP receive node - * @node tuntap-rx - * - * @param *vm - vlib_main_t - * @param *node - vlib_node_runtime_t - * @param *frame - vlib_frame_t - * - * @return rc - uword - * - */ -static uword -tuntap_rx (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - tuntap_main_t * tm = &tuntap_main; - vlib_buffer_t * b; - u32 bi; - const uword buffer_size = VLIB_BUFFER_DATA_SIZE; - - /** Make sure we have some RX buffers. */ - { - uword n_left = vec_len (tm->rx_buffers); - uword n_alloc; - - if (n_left < VLIB_FRAME_SIZE / 2) - { - if (! tm->rx_buffers) - vec_alloc (tm->rx_buffers, VLIB_FRAME_SIZE); - - n_alloc = vlib_buffer_alloc (vm, tm->rx_buffers + n_left, VLIB_FRAME_SIZE - n_left); - _vec_len (tm->rx_buffers) = n_left + n_alloc; - } - } - - /** Allocate RX buffers from end of rx_buffers. - Turn them into iovecs to pass to readv. */ - { - uword i_rx = vec_len (tm->rx_buffers) - 1; - vlib_buffer_t * b; - word i, n_bytes_left, n_bytes_in_packet; - - /** We should have enough buffers left for an MTU sized packet. */ - ASSERT (vec_len (tm->rx_buffers) >= tm->mtu_buffers); - - vec_validate (tm->iovecs, tm->mtu_buffers - 1); - for (i = 0; i < tm->mtu_buffers; i++) - { - b = vlib_get_buffer (vm, tm->rx_buffers[i_rx - i]); - tm->iovecs[i].iov_base = b->data; - tm->iovecs[i].iov_len = buffer_size; - } - - n_bytes_left = readv (tm->dev_net_tun_fd, tm->iovecs, tm->mtu_buffers); - n_bytes_in_packet = n_bytes_left; - if (n_bytes_left <= 0) - { - if (errno != EAGAIN) - clib_unix_warning ("readv %d", n_bytes_left); - return 0; - } - - bi = tm->rx_buffers[i_rx]; - - while (1) - { - b = vlib_get_buffer (vm, tm->rx_buffers[i_rx]); - b->flags = 0; - b->current_data = 0; - b->current_length = n_bytes_left < buffer_size ? n_bytes_left : buffer_size; - - n_bytes_left -= buffer_size; - - if (n_bytes_left <= 0) - { - break; - } - - i_rx--; - b->flags |= VLIB_BUFFER_NEXT_PRESENT; - b->next_buffer = tm->rx_buffers[i_rx]; - } - - /** Interface counters for tuntap interface. */ - vlib_increment_combined_counter - (vnet_main.interface_main.combined_sw_if_counters - + VNET_INTERFACE_COUNTER_RX, - os_get_cpu_number(), - tm->sw_if_index, - 1, n_bytes_in_packet); - - _vec_len (tm->rx_buffers) = i_rx; - } - - b = vlib_get_buffer (vm, bi); - - { - u32 next_index; - uword n_trace = vlib_get_trace_count (vm, node); - - vnet_buffer (b)->sw_if_index[VLIB_RX] = tm->sw_if_index; - vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32)~0; - - /* - * Turn this on if you run into - * "bad monkey" contexts, and you want to know exactly - * which nodes they've visited... - */ - if (VLIB_BUFFER_TRACE_TRAJECTORY) - b->pre_data[0] = 0; - - b->error = node->errors[0]; - - if (tm->is_ether) - { - next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; - } - else - switch (b->data[0] & 0xf0) - { - case 0x40: - next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT; - break; - case 0x60: - next_index = VNET_DEVICE_INPUT_NEXT_IP6_INPUT; - break; - default: - next_index = VNET_DEVICE_INPUT_NEXT_DROP; - break; - } - - /* The linux kernel couldn't care less if our interface is up */ - if (tm->have_normal_interface) - { - vnet_main_t *vnm = vnet_get_main(); - vnet_sw_interface_t * si; - si = vnet_get_sw_interface (vnm, tm->sw_if_index); - if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)) - next_index = VNET_DEVICE_INPUT_NEXT_DROP; - } - - vnet_feature_start_device_input_x1 (tm->sw_if_index, &next_index, b, 0); - - vlib_set_next_frame_buffer (vm, node, next_index, bi); - - if (n_trace > 0) - { - vlib_trace_buffer (vm, node, next_index, - b, /* follow_chain */ 1); - vlib_set_trace_count (vm, node, n_trace - 1); - } - } - - return 1; -} - -/** - * @brief TUNTAP_RX error strings - */ -static char * tuntap_rx_error_strings[] = { - "unknown packet type", -}; - -VLIB_REGISTER_NODE (tuntap_rx_node,static) = { - .function = tuntap_rx, - .name = "tuntap-rx", - .sibling_of = "device-input", - .type = VLIB_NODE_TYPE_INPUT, - .state = VLIB_NODE_STATE_INTERRUPT, - .vector_size = 4, - .n_errors = 1, - .error_strings = tuntap_rx_error_strings, -}; - -/** - * @brief Gets called when file descriptor is ready from epoll. - * - * @param *uf - unix_file_t - * - * @return error - clib_error_t - */ -static clib_error_t * tuntap_read_ready (unix_file_t * uf) -{ - vlib_main_t * vm = vlib_get_main(); - vlib_node_set_interrupt_pending (vm, tuntap_rx_node.index); - return 0; -} - -/** - * @brief Clean up the tun/tap device - * - * @param *vm - vlib_main_t - * - * @return error - clib_error_t - * - */ -static clib_error_t * -tuntap_exit (vlib_main_t * vm) -{ - tuntap_main_t *tm = &tuntap_main; - struct ifreq ifr; - int sfd; - - /* Not present. */ - if (! tm->dev_net_tun_fd || tm->dev_net_tun_fd < 0) - return 0; - - sfd = socket (AF_INET, SOCK_STREAM, 0); - if (sfd < 0) - clib_unix_warning("provisioning socket"); - - memset(&ifr, 0, sizeof (ifr)); - strncpy (ifr.ifr_name, tm->tun_name, sizeof (ifr.ifr_name)-1); - - /* get flags, modify to bring down interface... */ - if (ioctl (sfd, SIOCGIFFLAGS, &ifr) < 0) - clib_unix_warning ("SIOCGIFFLAGS"); - - ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING); - - if (ioctl (sfd, SIOCSIFFLAGS, &ifr) < 0) - clib_unix_warning ("SIOCSIFFLAGS"); - - /* Turn off persistence */ - if (ioctl (tm->dev_net_tun_fd, TUNSETPERSIST, 0) < 0) - clib_unix_warning ("TUNSETPERSIST"); - close(tm->dev_tap_fd); - if (tm->dev_net_tun_fd >= 0) - close(tm->dev_net_tun_fd); - if (sfd >= 0) - close (sfd); - - return 0; -} - -VLIB_MAIN_LOOP_EXIT_FUNCTION (tuntap_exit); - -/** - * @brief CLI function for tun/tap config - * - * @param *vm - vlib_main_t - * @param *input - unformat_input_t - * - * @return error - clib_error_t - * - */ -static clib_error_t * -tuntap_config (vlib_main_t * vm, unformat_input_t * input) -{ - tuntap_main_t *tm = &tuntap_main; - clib_error_t * error = 0; - struct ifreq ifr; - u8 * name; - int flags = IFF_TUN | IFF_NO_PI; - int is_enabled = 0, is_ether = 0, have_normal_interface = 0; - const uword buffer_size = VLIB_BUFFER_DATA_SIZE; - - while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) - { - if (unformat (input, "mtu %d", &tm->mtu_bytes)) - ; - else if (unformat (input, "enable")) - is_enabled = 1; - else if (unformat (input, "disable")) - is_enabled = 0; - else if (unformat (input, "ethernet") || - unformat (input, "ether")) - is_ether = 1; - else if (unformat (input, "have-normal-interface") || - unformat (input, "have-normal")) - have_normal_interface = 1; - else if (unformat (input, "name %s", &name)) - tm->tun_name = (char *) name; - else - return clib_error_return (0, "unknown input `%U'", - format_unformat_error, input); - } - - tm->dev_net_tun_fd = -1; - tm->dev_tap_fd = -1; - - if (is_enabled == 0) - return 0; - - if (geteuid()) - { - clib_warning ("tuntap disabled: must be superuser"); - return 0; - } - - tm->is_ether = is_ether; - tm->have_normal_interface = have_normal_interface; - - if (is_ether) - flags = IFF_TAP | IFF_NO_PI; - - if ((tm->dev_net_tun_fd = open ("/dev/net/tun", O_RDWR)) < 0) - { - error = clib_error_return_unix (0, "open /dev/net/tun"); - goto done; - } - - memset (&ifr, 0, sizeof (ifr)); - strncpy(ifr.ifr_name, tm->tun_name, sizeof(ifr.ifr_name)-1); - ifr.ifr_flags = flags; - if (ioctl (tm->dev_net_tun_fd, TUNSETIFF, (void *)&ifr) < 0) - { - error = clib_error_return_unix (0, "ioctl TUNSETIFF"); - goto done; - } - - /* Make it persistent, at least until we split. */ - if (ioctl (tm->dev_net_tun_fd, TUNSETPERSIST, 1) < 0) - { - error = clib_error_return_unix (0, "TUNSETPERSIST"); - goto done; - } - - /* Open a provisioning socket */ - if ((tm->dev_tap_fd = socket(PF_PACKET, SOCK_RAW, - htons(ETH_P_ALL))) < 0 ) - { - error = clib_error_return_unix (0, "socket"); - goto done; - } - - /* Find the interface index. */ - { - struct ifreq ifr; - struct sockaddr_ll sll; - - memset (&ifr, 0, sizeof(ifr)); - strncpy (ifr.ifr_name, tm->tun_name, sizeof(ifr.ifr_name)-1); - if (ioctl (tm->dev_tap_fd, SIOCGIFINDEX, &ifr) < 0 ) - { - error = clib_error_return_unix (0, "ioctl SIOCGIFINDEX"); - goto done; - } - - /* Bind the provisioning socket to the interface. */ - memset(&sll, 0, sizeof(sll)); - sll.sll_family = AF_PACKET; - sll.sll_ifindex = ifr.ifr_ifindex; - sll.sll_protocol = htons(ETH_P_ALL); - - if (bind(tm->dev_tap_fd, (struct sockaddr*) &sll, sizeof(sll)) < 0) - { - error = clib_error_return_unix (0, "bind"); - goto done; - } - } - - /* non-blocking I/O on /dev/tapX */ - { - int one = 1; - if (ioctl (tm->dev_net_tun_fd, FIONBIO, &one) < 0) - { - error = clib_error_return_unix (0, "ioctl FIONBIO"); - goto done; - } - } - - tm->mtu_buffers = (tm->mtu_bytes + (buffer_size - 1)) / buffer_size; - - ifr.ifr_mtu = tm->mtu_bytes; - if (ioctl (tm->dev_tap_fd, SIOCSIFMTU, &ifr) < 0) - { - error = clib_error_return_unix (0, "ioctl SIOCSIFMTU"); - goto done; - } - - /* get flags, modify to bring up interface... */ - if (ioctl (tm->dev_tap_fd, SIOCGIFFLAGS, &ifr) < 0) - { - error = clib_error_return_unix (0, "ioctl SIOCGIFFLAGS"); - goto done; - } - - ifr.ifr_flags |= (IFF_UP | IFF_RUNNING); - - if (ioctl (tm->dev_tap_fd, SIOCSIFFLAGS, &ifr) < 0) - { - error = clib_error_return_unix (0, "ioctl SIOCSIFFLAGS"); - goto done; - } - - if (is_ether) - { - if (ioctl (tm->dev_tap_fd, SIOCGIFHWADDR, &ifr) < 0) - { - error = clib_error_return_unix (0, "ioctl SIOCGIFHWADDR"); - goto done; - } - else - clib_memcpy (tm->ether_dst_mac, ifr.ifr_hwaddr.sa_data, 6); - } - - if (have_normal_interface) - { - vnet_main_t *vnm = vnet_get_main(); - error = ethernet_register_interface - (vnm, - tuntap_dev_class.index, - 0 /* device instance */, - tm->ether_dst_mac /* ethernet address */, - &tm->hw_if_index, - 0 /* flag change */); - if (error) - clib_error_report (error); - tm->sw_if_index = tm->hw_if_index; - vm->os_punt_frame = tuntap_nopunt_frame; - } - else - { - vnet_main_t *vnm = vnet_get_main(); - vnet_hw_interface_t * hi; - - vm->os_punt_frame = tuntap_punt_frame; - - tm->hw_if_index = vnet_register_interface - (vnm, - tuntap_dev_class.index, 0 /* device instance */, - tuntap_interface_class.index, 0); - hi = vnet_get_hw_interface (vnm, tm->hw_if_index); - tm->sw_if_index = hi->sw_if_index; - - /* Interface is always up. */ - vnet_hw_interface_set_flags (vnm, tm->hw_if_index, - VNET_HW_INTERFACE_FLAG_LINK_UP); - vnet_sw_interface_set_flags (vnm, tm->sw_if_index, - VNET_SW_INTERFACE_FLAG_ADMIN_UP); - } - - { - unix_file_t template = {0}; - template.read_function = tuntap_read_ready; - template.file_descriptor = tm->dev_net_tun_fd; - tm->unix_file_index = unix_file_add (&unix_main, &template); - } - - done: - if (error) - { - if (tm->dev_net_tun_fd >= 0) - close (tm->dev_net_tun_fd); - if (tm->dev_tap_fd >= 0) - close (tm->dev_tap_fd); - } - - return error; -} - -VLIB_CONFIG_FUNCTION (tuntap_config, "tuntap"); - -/** - * @brief Add or Del IP4 address to tun/tap interface - * - * @param *im - ip4_main_t - * @param opaque - uword - * @param sw_if_index - u32 - * @param *address - ip4_address_t - * @param is_delete - u32 - * - */ -void -tuntap_ip4_add_del_interface_address (ip4_main_t * im, - uword opaque, - u32 sw_if_index, - ip4_address_t * address, - u32 address_length, - u32 if_address_index, - u32 is_delete) -{ - tuntap_main_t * tm = &tuntap_main; - struct ifreq ifr; - subif_address_t subif_addr, * ap; - uword * p; - - /** Tuntap disabled, or using a "normal" interface. */ - if (tm->have_normal_interface || tm->dev_tap_fd < 0) - return; - - /** See if we already know about this subif */ - memset (&subif_addr, 0, sizeof (subif_addr)); - subif_addr.sw_if_index = sw_if_index; - clib_memcpy (&subif_addr.addr, address, sizeof (*address)); - - p = mhash_get (&tm->subif_mhash, &subif_addr); - - if (p) - ap = pool_elt_at_index (tm->subifs, p[0]); - else - { - pool_get (tm->subifs, ap); - *ap = subif_addr; - mhash_set (&tm->subif_mhash, ap, ap - tm->subifs, 0); - } - - /* Use subif pool index to select alias device. */ - memset (&ifr, 0, sizeof (ifr)); - snprintf (ifr.ifr_name, sizeof(ifr.ifr_name), - "%s:%d", tm->tun_name, (int)(ap - tm->subifs)); - - /* the tuntap punt/inject is enabled for IPv4 RX so long as - * any vpp interface has an IPv4 address. - * this is also ref counted. - */ - ip4_sw_interface_enable_disable (tm->sw_if_index, !is_delete); - - if (! is_delete) - { - struct sockaddr_in * sin; - - sin = (struct sockaddr_in *)&ifr.ifr_addr; - - /* Set ipv4 address, netmask. */ - sin->sin_family = AF_INET; - clib_memcpy (&sin->sin_addr.s_addr, address, 4); - if (ioctl (tm->dev_tap_fd, SIOCSIFADDR, &ifr) < 0) - clib_unix_warning ("ioctl SIOCSIFADDR"); - - sin->sin_addr.s_addr = im->fib_masks[address_length]; - if (ioctl (tm->dev_tap_fd, SIOCSIFNETMASK, &ifr) < 0) - clib_unix_warning ("ioctl SIOCSIFNETMASK"); - } - else - { - mhash_unset (&tm->subif_mhash, &subif_addr, 0 /* old value ptr */); - pool_put (tm->subifs, ap); - } - - /* get flags, modify to bring up interface... */ - if (ioctl (tm->dev_tap_fd, SIOCGIFFLAGS, &ifr) < 0) - clib_unix_warning ("ioctl SIOCGIFFLAGS"); - - if (is_delete) - ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING); - else - ifr.ifr_flags |= (IFF_UP | IFF_RUNNING); - - if (ioctl (tm->dev_tap_fd, SIOCSIFFLAGS, &ifr) < 0) - clib_unix_warning ("ioctl SIOCSIFFLAGS"); -} - -/** - * @brief workaround for a known include file bug. - * including @c <linux/ipv6.h> causes multiple definitions if - * @c <netinet/in.h is also included. - */ -struct in6_ifreq { - struct in6_addr ifr6_addr; - u32 ifr6_prefixlen; - int ifr6_ifindex; -}; - -/** - * @brief Add or Del tun/tap interface address. - * - * Both the v6 interface address API and the way ifconfig - * displays subinterfaces differ from their v4 couterparts. - * The code given here seems to work but YMMV. - * - * @param *im - ip6_main_t - * @param opaque - uword - * @param sw_if_index - u32 - * @param *address - ip6_address_t - * @param address_length - u32 - * @param if_address_index - u32 - * @param is_delete - u32 - */ -void -tuntap_ip6_add_del_interface_address (ip6_main_t * im, - uword opaque, - u32 sw_if_index, - ip6_address_t * address, - u32 address_length, - u32 if_address_index, - u32 is_delete) -{ - tuntap_main_t * tm = &tuntap_main; - struct ifreq ifr; - struct in6_ifreq ifr6; - subif_address_t subif_addr, * ap; - uword * p; - - /* Tuntap disabled, or using a "normal" interface. */ - if (tm->have_normal_interface || tm->dev_tap_fd < 0) - return; - - /* See if we already know about this subif */ - memset (&subif_addr, 0, sizeof (subif_addr)); - subif_addr.sw_if_index = sw_if_index; - subif_addr.is_v6 = 1; - clib_memcpy (&subif_addr.addr, address, sizeof (*address)); - - p = mhash_get (&tm->subif_mhash, &subif_addr); - - if (p) - ap = pool_elt_at_index (tm->subifs, p[0]); - else - { - pool_get (tm->subifs, ap); - *ap = subif_addr; - mhash_set (&tm->subif_mhash, ap, ap - tm->subifs, 0); - } - - /* Use subif pool index to select alias device. */ - memset (&ifr, 0, sizeof (ifr)); - memset (&ifr6, 0, sizeof (ifr6)); - snprintf (ifr.ifr_name, sizeof(ifr.ifr_name), - "%s:%d", tm->tun_name, (int)(ap - tm->subifs)); - - /* the tuntap punt/inject is enabled for IPv6 RX so long as - * any vpp interface has an IPv6 address. - * this is also ref counted. - */ - ip6_sw_interface_enable_disable (tm->sw_if_index, !is_delete); - - if (! is_delete) - { - int sockfd = socket (AF_INET6, SOCK_STREAM, 0); - if (sockfd < 0) - clib_unix_warning ("get ifindex socket"); - - if (ioctl (sockfd, SIOGIFINDEX, &ifr) < 0) - clib_unix_warning ("get ifindex"); - - ifr6.ifr6_ifindex = ifr.ifr_ifindex; - ifr6.ifr6_prefixlen = address_length; - clib_memcpy (&ifr6.ifr6_addr, address, 16); - - if (ioctl (sockfd, SIOCSIFADDR, &ifr6) < 0) - clib_unix_warning ("set address"); - - if (sockfd >= 0) - close (sockfd); - } - else - { - int sockfd = socket (AF_INET6, SOCK_STREAM, 0); - if (sockfd < 0) - clib_unix_warning ("get ifindex socket"); - - if (ioctl (sockfd, SIOGIFINDEX, &ifr) < 0) - clib_unix_warning ("get ifindex"); - - ifr6.ifr6_ifindex = ifr.ifr_ifindex; - ifr6.ifr6_prefixlen = address_length; - clib_memcpy (&ifr6.ifr6_addr, address, 16); - - if (ioctl (sockfd, SIOCDIFADDR, &ifr6) < 0) - clib_unix_warning ("del address"); - - if (sockfd >= 0) - close (sockfd); - - mhash_unset (&tm->subif_mhash, &subif_addr, 0 /* old value ptr */); - pool_put (tm->subifs, ap); - } -} - -/** - * @brief TX the tun/tap frame - * - * @param *vm - vlib_main_t - * @param *node - vlib_node_runtime_t - * @param *frame - vlib_frame_t - * - */ -static void -tuntap_punt_frame (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - tuntap_tx (vm, node, frame); - vlib_frame_free (vm, node, frame); -} - -/** - * @brief Free the tun/tap frame - * - * @param *vm - vlib_main_t - * @param *node - vlib_node_runtime_t - * @param *frame - vlib_frame_t - * - */ -static void -tuntap_nopunt_frame (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - u32 * buffers = vlib_frame_args (frame); - uword n_packets = frame->n_vectors; - vlib_buffer_free (vm, buffers, n_packets); - vlib_frame_free (vm, node, frame); -} - -VNET_HW_INTERFACE_CLASS (tuntap_interface_class,static) = { - .name = "tuntap", - .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P, -}; - -/** - * @brief Format tun/tap interface name - * - * @param *s - u8 - formatter string - * @param *args - va_list - * - * @return *s - u8 - formatted string - * - */ -static u8 * format_tuntap_interface_name (u8 * s, va_list * args) -{ - u32 i = va_arg (*args, u32); - - s = format (s, "tuntap-%d", i); - return s; -} - -/** - * @brief TX packet out tun/tap - * - * @param *vm - vlib_main_t - * @param *node - vlib_node_runtime_t - * @param *frame - vlib_frame_t - * - * @return n_buffers - uword - Packets transmitted - * - */ -static uword -tuntap_intfc_tx (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - tuntap_main_t * tm = &tuntap_main; - u32 * buffers = vlib_frame_args (frame); - uword n_buffers = frame->n_vectors; - - /* Normal interface transmit happens only on the normal interface... */ - if (tm->have_normal_interface) - return tuntap_tx (vm, node, frame); - - vlib_buffer_free (vm, buffers, n_buffers); - return n_buffers; -} - -VNET_DEVICE_CLASS (tuntap_dev_class,static) = { - .name = "tuntap", - .tx_function = tuntap_intfc_tx, - .format_device_name = format_tuntap_interface_name, -}; - -/** - * @brief tun/tap node init - * - * @param *vm - vlib_main_t - * - * @return error - clib_error_t - * - */ -static clib_error_t * -tuntap_init (vlib_main_t * vm) -{ - clib_error_t * error; - ip4_main_t * im4 = &ip4_main; - ip6_main_t * im6 = &ip6_main; - ip4_add_del_interface_address_callback_t cb4; - ip6_add_del_interface_address_callback_t cb6; - tuntap_main_t * tm = &tuntap_main; - - error = vlib_call_init_function (vm, ip4_init); - if (error) - return error; - - mhash_init (&tm->subif_mhash, sizeof (u32), sizeof(subif_address_t)); - - cb4.function = tuntap_ip4_add_del_interface_address; - cb4.function_opaque = 0; - vec_add1 (im4->add_del_interface_address_callbacks, cb4); - - cb6.function = tuntap_ip6_add_del_interface_address; - cb6.function_opaque = 0; - vec_add1 (im6->add_del_interface_address_callbacks, cb6); - - return 0; -} - -VLIB_INIT_FUNCTION (tuntap_init); |