diff options
Diffstat (limited to 'src/vnet/devices/af_packet/af_packet.c')
| -rw-r--r-- | src/vnet/devices/af_packet/af_packet.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/src/vnet/devices/af_packet/af_packet.c b/src/vnet/devices/af_packet/af_packet.c new file mode 100644 index 00000000000..91c3988b439 --- /dev/null +++ b/src/vnet/devices/af_packet/af_packet.c @@ -0,0 +1,366 @@ +/* + *------------------------------------------------------------------ + * 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 <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 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) +{ + /* nothing for now */ + return 0; +} + +static clib_error_t * +af_packet_fd_read_ready (unix_file_t * uf) +{ + vlib_main_t *vm = vlib_get_main (); + af_packet_main_t *apm = &af_packet_main; + u32 idx = uf->private_data; + + apm->pending_input_bitmap = + clib_bitmap_set (apm->pending_input_bitmap, idx, 1); + + /* Schedule the rx node */ + vlib_node_set_interrupt_pending (vm, af_packet_input_node.index); + + return 0; +} + +static int +create_packet_v2_sock (u8 * name, tpacket_req_t * rx_req, + tpacket_req_t * tx_req, int *fd, u8 ** ring) +{ + int ret, err; + struct sockaddr_ll sll; + uint host_if_index; + 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; + + host_if_index = if_nametoindex ((const char *) name); + + if (!host_if_index) + { + DBG_SOCK ("Wrong host interface name"); + ret = VNET_API_ERROR_INVALID_INTERFACE; + goto error; + } + + 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_main_t *vnm = vnet_get_main (); + uword *p; + uword if_index; + u8 *host_if_name_dup = vec_dup (host_if_name); + + 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; + + ret = create_packet_v2_sock (host_if_name, rx_req, tx_req, &fd, &ring); + + if (ret != 0) + goto error; + + /* So far everything looks good, let's create interface */ + pool_get (apm->interfaces, apif); + if_index = apif - apm->interfaces; + + 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; + + { + unix_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->unix_file_index = unix_file_add (&unix_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); + apif->sw_if_index = sw->sw_if_index; + + 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); + 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); + + /* clean up */ + if (apif->unix_file_index != ~0) + { + unix_file_del (&unix_main, unix_main.file_pool + apif->unix_file_index); + apif->unix_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; + + 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: + */ |