| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| 505 | 92.15% | 8 | 44.44% | |
| 34 | 6.20% | 4 | 22.22% | |
| 3 | 0.55% | 1 | 5.56% | |
| 2 | 0.36% | 1 | 5.56% | |
| 1 | 0.18% | 1 | 5.56% | |
| 1 | 0.18% | 1 | 5.56% | |
| 1 | 0.18% | 1 | 5.56% | |
| 1 | 0.18% | 1 | 5.56% | |
| Total | 548 | 18 |
| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Oliver Hartkopp | 505 | 92.15% | 8 | 44.44% |
| Marc Kleine-Budde | 34 | 6.20% | 4 | 22.22% |
| Tejun Heo | 3 | 0.55% | 1 | 5.56% |
| David S. Miller | 2 | 0.36% | 1 | 5.56% |
| Jeremiah Mahler | 1 | 0.18% | 1 | 5.56% |
| Joe Perches | 1 | 0.18% | 1 | 5.56% |
| Rusty Russell | 1 | 0.18% | 1 | 5.56% |
| Stephen Hemminger | 1 | 0.18% | 1 | 5.56% |
| Total | 548 | 18 |
/* vcan.c - Virtual CAN interface * * Copyright (c) 2002-2017 Volkswagen Group Electronic Research * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Volkswagen nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * Alternatively, provided that this notice is retained in full, this * software may be distributed under the terms of the GNU General * Public License ("GPL") version 2, in which case the provisions of the * GPL apply INSTEAD OF those given above. * * The provided data structures and external interfaces from this code * are not restricted to be used by modules with a GPL compatible license. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/init.h> #include <linux/netdevice.h> #include <linux/if_arp.h> #include <linux/if_ether.h> #include <linux/can.h> #include <linux/can/can-ml.h> #include <linux/can/dev.h> #include <linux/can/skb.h> #include <linux/slab.h> #include <net/rtnetlink.h> #define DRV_NAME "vcan" MODULE_DESCRIPTION("virtual CAN interface"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>"); MODULE_ALIAS_RTNL_LINK(DRV_NAME); /* CAN test feature: * Enable the echo on driver level for testing the CAN core echo modes. * See Documentation/networking/can.rst for details. */ static bool echo; /* echo testing. Default: 0 (Off) */ module_param(echo, bool, 0444); MODULE_PARM_DESC(echo, "Echo sent frames (for testing). Default: 0 (Off)"); static void vcan_rx(struct sk_buff *skb, struct net_device *dev) { struct canfd_frame *cfd = (struct canfd_frame *)skb->data; struct net_device_stats *stats = &dev->stats; stats->rx_packets++; stats->rx_bytes += cfd->len; skb->pkt_type = PACKET_BROADCAST; skb->dev = dev; skb->ip_summed = CHECKSUM_UNNECESSARY; netif_rx_ni(skb); } static netdev_tx_t vcan_tx(struct sk_buff *skb, struct net_device *dev) { struct canfd_frame *cfd = (struct canfd_frame *)skb->data; struct net_device_stats *stats = &dev->stats; int loop; if (can_dropped_invalid_skb(dev, skb)) return NETDEV_TX_OK; stats->tx_packets++; stats->tx_bytes += cfd->len; /* set flag whether this packet has to be looped back */ loop = skb->pkt_type == PACKET_LOOPBACK; if (!echo) { /* no echo handling available inside this driver */ if (loop) { /* only count the packets here, because the * CAN core already did the echo for us */ stats->rx_packets++; stats->rx_bytes += cfd->len; } consume_skb(skb); return NETDEV_TX_OK; } /* perform standard echo handling for CAN network interfaces */ if (loop) { skb = can_create_echo_skb(skb); if (!skb) return NETDEV_TX_OK; /* receive with packet counting */ vcan_rx(skb, dev); } else { /* no looped packets => no counting */ consume_skb(skb); } return NETDEV_TX_OK; } static int vcan_change_mtu(struct net_device *dev, int new_mtu) { /* Do not allow changing the MTU while running */ if (dev->flags & IFF_UP) return -EBUSY; if (new_mtu != CAN_MTU && new_mtu != CANFD_MTU) return -EINVAL; dev->mtu = new_mtu; return 0; } static const struct net_device_ops vcan_netdev_ops = { .ndo_start_xmit = vcan_tx, .ndo_change_mtu = vcan_change_mtu, }; static void vcan_setup(struct net_device *dev) { dev->type = ARPHRD_CAN; dev->mtu = CANFD_MTU; dev->hard_header_len = 0; dev->addr_len = 0; dev->tx_queue_len = 0; dev->flags = IFF_NOARP; dev->ml_priv = netdev_priv(dev); /* set flags according to driver capabilities */ if (echo) dev->flags |= IFF_ECHO; dev->netdev_ops = &vcan_netdev_ops; dev->needs_free_netdev = true; } static struct rtnl_link_ops vcan_link_ops __read_mostly = { .kind = DRV_NAME, .priv_size = sizeof(struct can_ml_priv), .setup = vcan_setup, }; static __init int vcan_init_module(void) { pr_info("Virtual CAN interface driver\n"); if (echo) pr_info("enabled echo on driver level.\n"); return rtnl_link_register(&vcan_link_ops); } static __exit void vcan_cleanup_module(void) { rtnl_link_unregister(&vcan_link_ops); } module_init(vcan_init_module); module_exit(vcan_cleanup_module);