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-rw-r--r--src/vnet/devices/af_packet/af_packet.c366
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:
+ */