Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 1 | /* |
| 2 | * raw.c - Raw sockets for protocol family CAN |
| 3 | * |
| 4 | * Copyright (c) 2002-2007 Volkswagen Group Electronic Research |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of Volkswagen nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * Alternatively, provided that this notice is retained in full, this |
| 20 | * software may be distributed under the terms of the GNU General |
| 21 | * Public License ("GPL") version 2, in which case the provisions of the |
| 22 | * GPL apply INSTEAD OF those given above. |
| 23 | * |
| 24 | * The provided data structures and external interfaces from this code |
| 25 | * are not restricted to be used by modules with a GPL compatible license. |
| 26 | * |
| 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| 38 | * DAMAGE. |
| 39 | * |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 40 | */ |
| 41 | |
| 42 | #include <linux/module.h> |
| 43 | #include <linux/init.h> |
| 44 | #include <linux/uio.h> |
| 45 | #include <linux/net.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 46 | #include <linux/slab.h> |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 47 | #include <linux/netdevice.h> |
| 48 | #include <linux/socket.h> |
| 49 | #include <linux/if_arp.h> |
| 50 | #include <linux/skbuff.h> |
| 51 | #include <linux/can.h> |
| 52 | #include <linux/can/core.h> |
Oliver Hartkopp | 156c2bb | 2013-01-17 18:43:39 +0100 | [diff] [blame] | 53 | #include <linux/can/skb.h> |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 54 | #include <linux/can/raw.h> |
| 55 | #include <net/sock.h> |
| 56 | #include <net/net_namespace.h> |
| 57 | |
| 58 | #define CAN_RAW_VERSION CAN_VERSION |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 59 | |
| 60 | MODULE_DESCRIPTION("PF_CAN raw protocol"); |
| 61 | MODULE_LICENSE("Dual BSD/GPL"); |
| 62 | MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>"); |
Lothar Waßmann | b13bb2e | 2009-07-14 23:12:25 +0000 | [diff] [blame] | 63 | MODULE_ALIAS("can-proto-1"); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 64 | |
| 65 | #define MASK_ALL 0 |
| 66 | |
| 67 | /* |
| 68 | * A raw socket has a list of can_filters attached to it, each receiving |
| 69 | * the CAN frames matching that filter. If the filter list is empty, |
| 70 | * no CAN frames will be received by the socket. The default after |
| 71 | * opening the socket, is to have one filter which receives all frames. |
| 72 | * The filter list is allocated dynamically with the exception of the |
| 73 | * list containing only one item. This common case is optimized by |
| 74 | * storing the single filter in dfilter, to avoid using dynamic memory. |
| 75 | */ |
| 76 | |
Oliver Hartkopp | 514ac99 | 2015-04-01 07:50:28 +0200 | [diff] [blame] | 77 | struct uniqframe { |
Oliver Hartkopp | d3b58c4 | 2015-06-26 11:58:19 +0200 | [diff] [blame] | 78 | int skbcnt; |
Oliver Hartkopp | 514ac99 | 2015-04-01 07:50:28 +0200 | [diff] [blame] | 79 | const struct sk_buff *skb; |
Oliver Hartkopp | a5581ef | 2015-04-01 07:50:29 +0200 | [diff] [blame] | 80 | unsigned int join_rx_count; |
Oliver Hartkopp | 514ac99 | 2015-04-01 07:50:28 +0200 | [diff] [blame] | 81 | }; |
| 82 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 83 | struct raw_sock { |
| 84 | struct sock sk; |
| 85 | int bound; |
| 86 | int ifindex; |
| 87 | struct notifier_block notifier; |
| 88 | int loopback; |
| 89 | int recv_own_msgs; |
Oliver Hartkopp | e2d265d | 2012-06-13 20:41:31 +0200 | [diff] [blame] | 90 | int fd_frames; |
Oliver Hartkopp | a5581ef | 2015-04-01 07:50:29 +0200 | [diff] [blame] | 91 | int join_filters; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 92 | int count; /* number of active filters */ |
| 93 | struct can_filter dfilter; /* default/single filter */ |
| 94 | struct can_filter *filter; /* pointer to filter(s) */ |
| 95 | can_err_mask_t err_mask; |
Oliver Hartkopp | 514ac99 | 2015-04-01 07:50:28 +0200 | [diff] [blame] | 96 | struct uniqframe __percpu *uniq; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 97 | }; |
| 98 | |
Oliver Hartkopp | 1e55659 | 2010-10-19 09:32:04 +0000 | [diff] [blame] | 99 | /* |
| 100 | * Return pointer to store the extra msg flags for raw_recvmsg(). |
| 101 | * We use the space of one unsigned int beyond the 'struct sockaddr_can' |
| 102 | * in skb->cb. |
| 103 | */ |
| 104 | static inline unsigned int *raw_flags(struct sk_buff *skb) |
| 105 | { |
Eyal Birger | b4772ef | 2015-03-01 14:58:29 +0200 | [diff] [blame] | 106 | sock_skb_cb_check_size(sizeof(struct sockaddr_can) + |
| 107 | sizeof(unsigned int)); |
Oliver Hartkopp | 1e55659 | 2010-10-19 09:32:04 +0000 | [diff] [blame] | 108 | |
| 109 | /* return pointer after struct sockaddr_can */ |
| 110 | return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]); |
| 111 | } |
| 112 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 113 | static inline struct raw_sock *raw_sk(const struct sock *sk) |
| 114 | { |
| 115 | return (struct raw_sock *)sk; |
| 116 | } |
| 117 | |
Oliver Hartkopp | 1e55659 | 2010-10-19 09:32:04 +0000 | [diff] [blame] | 118 | static void raw_rcv(struct sk_buff *oskb, void *data) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 119 | { |
| 120 | struct sock *sk = (struct sock *)data; |
| 121 | struct raw_sock *ro = raw_sk(sk); |
| 122 | struct sockaddr_can *addr; |
Oliver Hartkopp | 1e55659 | 2010-10-19 09:32:04 +0000 | [diff] [blame] | 123 | struct sk_buff *skb; |
| 124 | unsigned int *pflags; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 125 | |
Oliver Hartkopp | 1fa17d4 | 2009-01-06 11:07:54 -0800 | [diff] [blame] | 126 | /* check the received tx sock reference */ |
Oliver Hartkopp | 1e55659 | 2010-10-19 09:32:04 +0000 | [diff] [blame] | 127 | if (!ro->recv_own_msgs && oskb->sk == sk) |
Oliver Hartkopp | 1fa17d4 | 2009-01-06 11:07:54 -0800 | [diff] [blame] | 128 | return; |
| 129 | |
Oliver Hartkopp | 821047c | 2014-03-01 15:31:53 +0100 | [diff] [blame] | 130 | /* do not pass non-CAN2.0 frames to a legacy socket */ |
| 131 | if (!ro->fd_frames && oskb->len != CAN_MTU) |
| 132 | return; |
Oliver Hartkopp | e2d265d | 2012-06-13 20:41:31 +0200 | [diff] [blame] | 133 | |
Oliver Hartkopp | 514ac99 | 2015-04-01 07:50:28 +0200 | [diff] [blame] | 134 | /* eliminate multiple filter matches for the same skb */ |
| 135 | if (this_cpu_ptr(ro->uniq)->skb == oskb && |
Oliver Hartkopp | d3b58c4 | 2015-06-26 11:58:19 +0200 | [diff] [blame] | 136 | this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) { |
Oliver Hartkopp | a5581ef | 2015-04-01 07:50:29 +0200 | [diff] [blame] | 137 | if (ro->join_filters) { |
| 138 | this_cpu_inc(ro->uniq->join_rx_count); |
| 139 | /* drop frame until all enabled filters matched */ |
| 140 | if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count) |
| 141 | return; |
| 142 | } else { |
| 143 | return; |
| 144 | } |
Oliver Hartkopp | 514ac99 | 2015-04-01 07:50:28 +0200 | [diff] [blame] | 145 | } else { |
| 146 | this_cpu_ptr(ro->uniq)->skb = oskb; |
Oliver Hartkopp | d3b58c4 | 2015-06-26 11:58:19 +0200 | [diff] [blame] | 147 | this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt; |
Oliver Hartkopp | a5581ef | 2015-04-01 07:50:29 +0200 | [diff] [blame] | 148 | this_cpu_ptr(ro->uniq)->join_rx_count = 1; |
| 149 | /* drop first frame to check all enabled filters? */ |
| 150 | if (ro->join_filters && ro->count > 1) |
| 151 | return; |
Oliver Hartkopp | 514ac99 | 2015-04-01 07:50:28 +0200 | [diff] [blame] | 152 | } |
| 153 | |
Oliver Hartkopp | 1fa17d4 | 2009-01-06 11:07:54 -0800 | [diff] [blame] | 154 | /* clone the given skb to be able to enqueue it into the rcv queue */ |
Oliver Hartkopp | 1e55659 | 2010-10-19 09:32:04 +0000 | [diff] [blame] | 155 | skb = skb_clone(oskb, GFP_ATOMIC); |
Oliver Hartkopp | 1fa17d4 | 2009-01-06 11:07:54 -0800 | [diff] [blame] | 156 | if (!skb) |
| 157 | return; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 158 | |
| 159 | /* |
| 160 | * Put the datagram to the queue so that raw_recvmsg() can |
| 161 | * get it from there. We need to pass the interface index to |
| 162 | * raw_recvmsg(). We pass a whole struct sockaddr_can in skb->cb |
| 163 | * containing the interface index. |
| 164 | */ |
| 165 | |
Eyal Birger | b4772ef | 2015-03-01 14:58:29 +0200 | [diff] [blame] | 166 | sock_skb_cb_check_size(sizeof(struct sockaddr_can)); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 167 | addr = (struct sockaddr_can *)skb->cb; |
| 168 | memset(addr, 0, sizeof(*addr)); |
| 169 | addr->can_family = AF_CAN; |
| 170 | addr->can_ifindex = skb->dev->ifindex; |
| 171 | |
Oliver Hartkopp | 1e55659 | 2010-10-19 09:32:04 +0000 | [diff] [blame] | 172 | /* add CAN specific message flags for raw_recvmsg() */ |
| 173 | pflags = raw_flags(skb); |
| 174 | *pflags = 0; |
| 175 | if (oskb->sk) |
| 176 | *pflags |= MSG_DONTROUTE; |
| 177 | if (oskb->sk == sk) |
| 178 | *pflags |= MSG_CONFIRM; |
| 179 | |
Urs Thuermann | a219994 | 2008-02-07 18:05:04 -0800 | [diff] [blame] | 180 | if (sock_queue_rcv_skb(sk, skb) < 0) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 181 | kfree_skb(skb); |
| 182 | } |
| 183 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 184 | static int raw_enable_filters(struct net *net, struct net_device *dev, |
| 185 | struct sock *sk, struct can_filter *filter, |
| 186 | int count) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 187 | { |
| 188 | int err = 0; |
| 189 | int i; |
| 190 | |
| 191 | for (i = 0; i < count; i++) { |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 192 | err = can_rx_register(net, dev, filter[i].can_id, |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 193 | filter[i].can_mask, |
Eric Dumazet | f1712c7 | 2017-01-27 08:11:44 -0800 | [diff] [blame] | 194 | raw_rcv, sk, "raw", sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 195 | if (err) { |
| 196 | /* clean up successfully registered filters */ |
| 197 | while (--i >= 0) |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 198 | can_rx_unregister(net, dev, filter[i].can_id, |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 199 | filter[i].can_mask, |
| 200 | raw_rcv, sk); |
| 201 | break; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | return err; |
| 206 | } |
| 207 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 208 | static int raw_enable_errfilter(struct net *net, struct net_device *dev, |
| 209 | struct sock *sk, can_err_mask_t err_mask) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 210 | { |
| 211 | int err = 0; |
| 212 | |
| 213 | if (err_mask) |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 214 | err = can_rx_register(net, dev, 0, err_mask | CAN_ERR_FLAG, |
Eric Dumazet | f1712c7 | 2017-01-27 08:11:44 -0800 | [diff] [blame] | 215 | raw_rcv, sk, "raw", sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 216 | |
| 217 | return err; |
| 218 | } |
| 219 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 220 | static void raw_disable_filters(struct net *net, struct net_device *dev, |
| 221 | struct sock *sk, struct can_filter *filter, |
| 222 | int count) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 223 | { |
| 224 | int i; |
| 225 | |
| 226 | for (i = 0; i < count; i++) |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 227 | can_rx_unregister(net, dev, filter[i].can_id, |
| 228 | filter[i].can_mask, raw_rcv, sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 229 | } |
| 230 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 231 | static inline void raw_disable_errfilter(struct net *net, |
| 232 | struct net_device *dev, |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 233 | struct sock *sk, |
| 234 | can_err_mask_t err_mask) |
| 235 | |
| 236 | { |
| 237 | if (err_mask) |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 238 | can_rx_unregister(net, dev, 0, err_mask | CAN_ERR_FLAG, |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 239 | raw_rcv, sk); |
| 240 | } |
| 241 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 242 | static inline void raw_disable_allfilters(struct net *net, |
| 243 | struct net_device *dev, |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 244 | struct sock *sk) |
| 245 | { |
| 246 | struct raw_sock *ro = raw_sk(sk); |
| 247 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 248 | raw_disable_filters(net, dev, sk, ro->filter, ro->count); |
| 249 | raw_disable_errfilter(net, dev, sk, ro->err_mask); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 250 | } |
| 251 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 252 | static int raw_enable_allfilters(struct net *net, struct net_device *dev, |
| 253 | struct sock *sk) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 254 | { |
| 255 | struct raw_sock *ro = raw_sk(sk); |
| 256 | int err; |
| 257 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 258 | err = raw_enable_filters(net, dev, sk, ro->filter, ro->count); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 259 | if (!err) { |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 260 | err = raw_enable_errfilter(net, dev, sk, ro->err_mask); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 261 | if (err) |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 262 | raw_disable_filters(net, dev, sk, ro->filter, |
| 263 | ro->count); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | return err; |
| 267 | } |
| 268 | |
| 269 | static int raw_notifier(struct notifier_block *nb, |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 270 | unsigned long msg, void *ptr) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 271 | { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 272 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 273 | struct raw_sock *ro = container_of(nb, struct raw_sock, notifier); |
| 274 | struct sock *sk = &ro->sk; |
| 275 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 276 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 277 | return NOTIFY_DONE; |
| 278 | |
| 279 | if (dev->type != ARPHRD_CAN) |
| 280 | return NOTIFY_DONE; |
| 281 | |
| 282 | if (ro->ifindex != dev->ifindex) |
| 283 | return NOTIFY_DONE; |
| 284 | |
| 285 | switch (msg) { |
| 286 | |
| 287 | case NETDEV_UNREGISTER: |
| 288 | lock_sock(sk); |
| 289 | /* remove current filters & unregister */ |
| 290 | if (ro->bound) |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 291 | raw_disable_allfilters(dev_net(dev), dev, sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 292 | |
| 293 | if (ro->count > 1) |
| 294 | kfree(ro->filter); |
| 295 | |
| 296 | ro->ifindex = 0; |
| 297 | ro->bound = 0; |
| 298 | ro->count = 0; |
| 299 | release_sock(sk); |
| 300 | |
| 301 | sk->sk_err = ENODEV; |
| 302 | if (!sock_flag(sk, SOCK_DEAD)) |
| 303 | sk->sk_error_report(sk); |
| 304 | break; |
| 305 | |
| 306 | case NETDEV_DOWN: |
| 307 | sk->sk_err = ENETDOWN; |
| 308 | if (!sock_flag(sk, SOCK_DEAD)) |
| 309 | sk->sk_error_report(sk); |
| 310 | break; |
| 311 | } |
| 312 | |
| 313 | return NOTIFY_DONE; |
| 314 | } |
| 315 | |
| 316 | static int raw_init(struct sock *sk) |
| 317 | { |
| 318 | struct raw_sock *ro = raw_sk(sk); |
| 319 | |
| 320 | ro->bound = 0; |
| 321 | ro->ifindex = 0; |
| 322 | |
| 323 | /* set default filter to single entry dfilter */ |
| 324 | ro->dfilter.can_id = 0; |
| 325 | ro->dfilter.can_mask = MASK_ALL; |
| 326 | ro->filter = &ro->dfilter; |
| 327 | ro->count = 1; |
| 328 | |
| 329 | /* set default loopback behaviour */ |
| 330 | ro->loopback = 1; |
| 331 | ro->recv_own_msgs = 0; |
Oliver Hartkopp | e2d265d | 2012-06-13 20:41:31 +0200 | [diff] [blame] | 332 | ro->fd_frames = 0; |
Oliver Hartkopp | a5581ef | 2015-04-01 07:50:29 +0200 | [diff] [blame] | 333 | ro->join_filters = 0; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 334 | |
Oliver Hartkopp | 514ac99 | 2015-04-01 07:50:28 +0200 | [diff] [blame] | 335 | /* alloc_percpu provides zero'ed memory */ |
| 336 | ro->uniq = alloc_percpu(struct uniqframe); |
| 337 | if (unlikely(!ro->uniq)) |
| 338 | return -ENOMEM; |
| 339 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 340 | /* set notifier */ |
| 341 | ro->notifier.notifier_call = raw_notifier; |
| 342 | |
| 343 | register_netdevice_notifier(&ro->notifier); |
| 344 | |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | static int raw_release(struct socket *sock) |
| 349 | { |
| 350 | struct sock *sk = sock->sk; |
Oliver Hartkopp | 10022a6 | 2011-04-20 01:57:15 +0000 | [diff] [blame] | 351 | struct raw_sock *ro; |
| 352 | |
| 353 | if (!sk) |
| 354 | return 0; |
| 355 | |
| 356 | ro = raw_sk(sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 357 | |
| 358 | unregister_netdevice_notifier(&ro->notifier); |
| 359 | |
| 360 | lock_sock(sk); |
| 361 | |
| 362 | /* remove current filters & unregister */ |
| 363 | if (ro->bound) { |
| 364 | if (ro->ifindex) { |
| 365 | struct net_device *dev; |
| 366 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 367 | dev = dev_get_by_index(sock_net(sk), ro->ifindex); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 368 | if (dev) { |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 369 | raw_disable_allfilters(dev_net(dev), dev, sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 370 | dev_put(dev); |
| 371 | } |
| 372 | } else |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 373 | raw_disable_allfilters(sock_net(sk), NULL, sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 374 | } |
| 375 | |
| 376 | if (ro->count > 1) |
| 377 | kfree(ro->filter); |
| 378 | |
| 379 | ro->ifindex = 0; |
| 380 | ro->bound = 0; |
| 381 | ro->count = 0; |
Oliver Hartkopp | 514ac99 | 2015-04-01 07:50:28 +0200 | [diff] [blame] | 382 | free_percpu(ro->uniq); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 383 | |
Lothar Waßmann | f7e5cc0 | 2009-07-14 23:10:21 +0000 | [diff] [blame] | 384 | sock_orphan(sk); |
| 385 | sock->sk = NULL; |
| 386 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 387 | release_sock(sk); |
| 388 | sock_put(sk); |
| 389 | |
| 390 | return 0; |
| 391 | } |
| 392 | |
| 393 | static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len) |
| 394 | { |
| 395 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; |
| 396 | struct sock *sk = sock->sk; |
| 397 | struct raw_sock *ro = raw_sk(sk); |
| 398 | int ifindex; |
| 399 | int err = 0; |
| 400 | int notify_enetdown = 0; |
| 401 | |
| 402 | if (len < sizeof(*addr)) |
| 403 | return -EINVAL; |
| 404 | |
| 405 | lock_sock(sk); |
| 406 | |
| 407 | if (ro->bound && addr->can_ifindex == ro->ifindex) |
| 408 | goto out; |
| 409 | |
| 410 | if (addr->can_ifindex) { |
| 411 | struct net_device *dev; |
| 412 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 413 | dev = dev_get_by_index(sock_net(sk), addr->can_ifindex); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 414 | if (!dev) { |
| 415 | err = -ENODEV; |
| 416 | goto out; |
| 417 | } |
| 418 | if (dev->type != ARPHRD_CAN) { |
| 419 | dev_put(dev); |
| 420 | err = -ENODEV; |
| 421 | goto out; |
| 422 | } |
| 423 | if (!(dev->flags & IFF_UP)) |
| 424 | notify_enetdown = 1; |
| 425 | |
| 426 | ifindex = dev->ifindex; |
| 427 | |
| 428 | /* filters set by default/setsockopt */ |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 429 | err = raw_enable_allfilters(sock_net(sk), dev, sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 430 | dev_put(dev); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 431 | } else { |
| 432 | ifindex = 0; |
| 433 | |
| 434 | /* filters set by default/setsockopt */ |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 435 | err = raw_enable_allfilters(sock_net(sk), NULL, sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 436 | } |
| 437 | |
| 438 | if (!err) { |
| 439 | if (ro->bound) { |
| 440 | /* unregister old filters */ |
| 441 | if (ro->ifindex) { |
| 442 | struct net_device *dev; |
| 443 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 444 | dev = dev_get_by_index(sock_net(sk), |
| 445 | ro->ifindex); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 446 | if (dev) { |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 447 | raw_disable_allfilters(dev_net(dev), |
| 448 | dev, sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 449 | dev_put(dev); |
| 450 | } |
| 451 | } else |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 452 | raw_disable_allfilters(sock_net(sk), NULL, sk); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 453 | } |
| 454 | ro->ifindex = ifindex; |
| 455 | ro->bound = 1; |
| 456 | } |
| 457 | |
| 458 | out: |
| 459 | release_sock(sk); |
| 460 | |
| 461 | if (notify_enetdown) { |
| 462 | sk->sk_err = ENETDOWN; |
| 463 | if (!sock_flag(sk, SOCK_DEAD)) |
| 464 | sk->sk_error_report(sk); |
| 465 | } |
| 466 | |
| 467 | return err; |
| 468 | } |
| 469 | |
| 470 | static int raw_getname(struct socket *sock, struct sockaddr *uaddr, |
| 471 | int *len, int peer) |
| 472 | { |
| 473 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; |
| 474 | struct sock *sk = sock->sk; |
| 475 | struct raw_sock *ro = raw_sk(sk); |
| 476 | |
| 477 | if (peer) |
| 478 | return -EOPNOTSUPP; |
| 479 | |
Eric Dumazet | e84b90a | 2009-08-06 20:27:04 +0000 | [diff] [blame] | 480 | memset(addr, 0, sizeof(*addr)); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 481 | addr->can_family = AF_CAN; |
| 482 | addr->can_ifindex = ro->ifindex; |
| 483 | |
| 484 | *len = sizeof(*addr); |
| 485 | |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | static int raw_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 490 | char __user *optval, unsigned int optlen) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 491 | { |
| 492 | struct sock *sk = sock->sk; |
| 493 | struct raw_sock *ro = raw_sk(sk); |
| 494 | struct can_filter *filter = NULL; /* dyn. alloc'ed filters */ |
| 495 | struct can_filter sfilter; /* single filter */ |
| 496 | struct net_device *dev = NULL; |
| 497 | can_err_mask_t err_mask = 0; |
| 498 | int count = 0; |
| 499 | int err = 0; |
| 500 | |
| 501 | if (level != SOL_CAN_RAW) |
| 502 | return -EINVAL; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 503 | |
| 504 | switch (optname) { |
| 505 | |
| 506 | case CAN_RAW_FILTER: |
| 507 | if (optlen % sizeof(struct can_filter) != 0) |
| 508 | return -EINVAL; |
| 509 | |
Marc Kleine-Budde | 332b05c | 2016-12-05 11:44:23 +0100 | [diff] [blame] | 510 | if (optlen > CAN_RAW_FILTER_MAX * sizeof(struct can_filter)) |
| 511 | return -EINVAL; |
| 512 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 513 | count = optlen / sizeof(struct can_filter); |
| 514 | |
| 515 | if (count > 1) { |
| 516 | /* filter does not fit into dfilter => alloc space */ |
Julia Lawall | 16dff91 | 2010-05-21 22:18:34 +0000 | [diff] [blame] | 517 | filter = memdup_user(optval, optlen); |
| 518 | if (IS_ERR(filter)) |
| 519 | return PTR_ERR(filter); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 520 | } else if (count == 1) { |
Eric Dumazet | 4ffa870 | 2010-04-09 23:47:31 +0000 | [diff] [blame] | 521 | if (copy_from_user(&sfilter, optval, sizeof(sfilter))) |
Sam Ravnborg | 3f91bd4 | 2008-04-26 22:57:25 -0700 | [diff] [blame] | 522 | return -EFAULT; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | lock_sock(sk); |
| 526 | |
| 527 | if (ro->bound && ro->ifindex) |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 528 | dev = dev_get_by_index(sock_net(sk), ro->ifindex); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 529 | |
| 530 | if (ro->bound) { |
| 531 | /* (try to) register the new filters */ |
| 532 | if (count == 1) |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 533 | err = raw_enable_filters(sock_net(sk), dev, sk, |
| 534 | &sfilter, 1); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 535 | else |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 536 | err = raw_enable_filters(sock_net(sk), dev, sk, |
| 537 | filter, count); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 538 | if (err) { |
| 539 | if (count > 1) |
| 540 | kfree(filter); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 541 | goto out_fil; |
| 542 | } |
| 543 | |
| 544 | /* remove old filter registrations */ |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 545 | raw_disable_filters(sock_net(sk), dev, sk, ro->filter, |
| 546 | ro->count); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | /* remove old filter space */ |
| 550 | if (ro->count > 1) |
| 551 | kfree(ro->filter); |
| 552 | |
| 553 | /* link new filters to the socket */ |
| 554 | if (count == 1) { |
| 555 | /* copy filter data for single filter */ |
| 556 | ro->dfilter = sfilter; |
| 557 | filter = &ro->dfilter; |
| 558 | } |
| 559 | ro->filter = filter; |
| 560 | ro->count = count; |
| 561 | |
| 562 | out_fil: |
| 563 | if (dev) |
| 564 | dev_put(dev); |
| 565 | |
| 566 | release_sock(sk); |
| 567 | |
| 568 | break; |
| 569 | |
| 570 | case CAN_RAW_ERR_FILTER: |
| 571 | if (optlen != sizeof(err_mask)) |
| 572 | return -EINVAL; |
| 573 | |
Sam Ravnborg | 3f91bd4 | 2008-04-26 22:57:25 -0700 | [diff] [blame] | 574 | if (copy_from_user(&err_mask, optval, optlen)) |
| 575 | return -EFAULT; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 576 | |
| 577 | err_mask &= CAN_ERR_MASK; |
| 578 | |
| 579 | lock_sock(sk); |
| 580 | |
| 581 | if (ro->bound && ro->ifindex) |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 582 | dev = dev_get_by_index(sock_net(sk), ro->ifindex); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 583 | |
| 584 | /* remove current error mask */ |
| 585 | if (ro->bound) { |
| 586 | /* (try to) register the new err_mask */ |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 587 | err = raw_enable_errfilter(sock_net(sk), dev, sk, |
| 588 | err_mask); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 589 | |
| 590 | if (err) |
| 591 | goto out_err; |
| 592 | |
| 593 | /* remove old err_mask registration */ |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 594 | raw_disable_errfilter(sock_net(sk), dev, sk, |
| 595 | ro->err_mask); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | /* link new err_mask to the socket */ |
| 599 | ro->err_mask = err_mask; |
| 600 | |
| 601 | out_err: |
| 602 | if (dev) |
| 603 | dev_put(dev); |
| 604 | |
| 605 | release_sock(sk); |
| 606 | |
| 607 | break; |
| 608 | |
| 609 | case CAN_RAW_LOOPBACK: |
| 610 | if (optlen != sizeof(ro->loopback)) |
| 611 | return -EINVAL; |
| 612 | |
Sam Ravnborg | 3f91bd4 | 2008-04-26 22:57:25 -0700 | [diff] [blame] | 613 | if (copy_from_user(&ro->loopback, optval, optlen)) |
| 614 | return -EFAULT; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 615 | |
| 616 | break; |
| 617 | |
| 618 | case CAN_RAW_RECV_OWN_MSGS: |
| 619 | if (optlen != sizeof(ro->recv_own_msgs)) |
| 620 | return -EINVAL; |
| 621 | |
Sam Ravnborg | 3f91bd4 | 2008-04-26 22:57:25 -0700 | [diff] [blame] | 622 | if (copy_from_user(&ro->recv_own_msgs, optval, optlen)) |
| 623 | return -EFAULT; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 624 | |
| 625 | break; |
| 626 | |
Oliver Hartkopp | e2d265d | 2012-06-13 20:41:31 +0200 | [diff] [blame] | 627 | case CAN_RAW_FD_FRAMES: |
| 628 | if (optlen != sizeof(ro->fd_frames)) |
| 629 | return -EINVAL; |
| 630 | |
| 631 | if (copy_from_user(&ro->fd_frames, optval, optlen)) |
| 632 | return -EFAULT; |
| 633 | |
| 634 | break; |
| 635 | |
Oliver Hartkopp | a5581ef | 2015-04-01 07:50:29 +0200 | [diff] [blame] | 636 | case CAN_RAW_JOIN_FILTERS: |
| 637 | if (optlen != sizeof(ro->join_filters)) |
| 638 | return -EINVAL; |
| 639 | |
| 640 | if (copy_from_user(&ro->join_filters, optval, optlen)) |
| 641 | return -EFAULT; |
| 642 | |
| 643 | break; |
| 644 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 645 | default: |
| 646 | return -ENOPROTOOPT; |
| 647 | } |
| 648 | return err; |
| 649 | } |
| 650 | |
| 651 | static int raw_getsockopt(struct socket *sock, int level, int optname, |
| 652 | char __user *optval, int __user *optlen) |
| 653 | { |
| 654 | struct sock *sk = sock->sk; |
| 655 | struct raw_sock *ro = raw_sk(sk); |
| 656 | int len; |
| 657 | void *val; |
| 658 | int err = 0; |
| 659 | |
| 660 | if (level != SOL_CAN_RAW) |
| 661 | return -EINVAL; |
| 662 | if (get_user(len, optlen)) |
| 663 | return -EFAULT; |
| 664 | if (len < 0) |
| 665 | return -EINVAL; |
| 666 | |
| 667 | switch (optname) { |
| 668 | |
| 669 | case CAN_RAW_FILTER: |
| 670 | lock_sock(sk); |
| 671 | if (ro->count > 0) { |
| 672 | int fsize = ro->count * sizeof(struct can_filter); |
| 673 | if (len > fsize) |
| 674 | len = fsize; |
Pavel Emelyanov | 653252c | 2008-04-25 01:49:48 -0700 | [diff] [blame] | 675 | if (copy_to_user(optval, ro->filter, len)) |
| 676 | err = -EFAULT; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 677 | } else |
| 678 | len = 0; |
| 679 | release_sock(sk); |
| 680 | |
| 681 | if (!err) |
| 682 | err = put_user(len, optlen); |
| 683 | return err; |
| 684 | |
| 685 | case CAN_RAW_ERR_FILTER: |
| 686 | if (len > sizeof(can_err_mask_t)) |
| 687 | len = sizeof(can_err_mask_t); |
| 688 | val = &ro->err_mask; |
| 689 | break; |
| 690 | |
| 691 | case CAN_RAW_LOOPBACK: |
| 692 | if (len > sizeof(int)) |
| 693 | len = sizeof(int); |
| 694 | val = &ro->loopback; |
| 695 | break; |
| 696 | |
| 697 | case CAN_RAW_RECV_OWN_MSGS: |
| 698 | if (len > sizeof(int)) |
| 699 | len = sizeof(int); |
| 700 | val = &ro->recv_own_msgs; |
| 701 | break; |
| 702 | |
Oliver Hartkopp | e2d265d | 2012-06-13 20:41:31 +0200 | [diff] [blame] | 703 | case CAN_RAW_FD_FRAMES: |
| 704 | if (len > sizeof(int)) |
| 705 | len = sizeof(int); |
| 706 | val = &ro->fd_frames; |
| 707 | break; |
| 708 | |
Oliver Hartkopp | a5581ef | 2015-04-01 07:50:29 +0200 | [diff] [blame] | 709 | case CAN_RAW_JOIN_FILTERS: |
| 710 | if (len > sizeof(int)) |
| 711 | len = sizeof(int); |
| 712 | val = &ro->join_filters; |
| 713 | break; |
| 714 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 715 | default: |
| 716 | return -ENOPROTOOPT; |
| 717 | } |
| 718 | |
| 719 | if (put_user(len, optlen)) |
| 720 | return -EFAULT; |
| 721 | if (copy_to_user(optval, val, len)) |
| 722 | return -EFAULT; |
| 723 | return 0; |
| 724 | } |
| 725 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 726 | static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 727 | { |
| 728 | struct sock *sk = sock->sk; |
| 729 | struct raw_sock *ro = raw_sk(sk); |
| 730 | struct sk_buff *skb; |
| 731 | struct net_device *dev; |
| 732 | int ifindex; |
| 733 | int err; |
| 734 | |
| 735 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 736 | DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 737 | |
Kurt Van Dijck | 5e507328 | 2011-01-15 20:56:42 -0800 | [diff] [blame] | 738 | if (msg->msg_namelen < sizeof(*addr)) |
| 739 | return -EINVAL; |
| 740 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 741 | if (addr->can_family != AF_CAN) |
| 742 | return -EINVAL; |
| 743 | |
| 744 | ifindex = addr->can_ifindex; |
| 745 | } else |
| 746 | ifindex = ro->ifindex; |
| 747 | |
Oliver Hartkopp | e2d265d | 2012-06-13 20:41:31 +0200 | [diff] [blame] | 748 | if (ro->fd_frames) { |
| 749 | if (unlikely(size != CANFD_MTU && size != CAN_MTU)) |
| 750 | return -EINVAL; |
| 751 | } else { |
| 752 | if (unlikely(size != CAN_MTU)) |
| 753 | return -EINVAL; |
| 754 | } |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 755 | |
Mario Kicherer | 8e8cda6 | 2017-02-21 12:19:47 +0100 | [diff] [blame] | 756 | dev = dev_get_by_index(sock_net(sk), ifindex); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 757 | if (!dev) |
| 758 | return -ENXIO; |
| 759 | |
Oliver Hartkopp | 156c2bb | 2013-01-17 18:43:39 +0100 | [diff] [blame] | 760 | skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv), |
| 761 | msg->msg_flags & MSG_DONTWAIT, &err); |
Ilpo Järvinen | ebad5c0 | 2008-12-14 23:16:58 -0800 | [diff] [blame] | 762 | if (!skb) |
| 763 | goto put_dev; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 764 | |
Oliver Hartkopp | 2bf3440 | 2013-01-28 08:33:33 +0000 | [diff] [blame] | 765 | can_skb_reserve(skb); |
| 766 | can_skb_prv(skb)->ifindex = dev->ifindex; |
Oliver Hartkopp | d3b58c4 | 2015-06-26 11:58:19 +0200 | [diff] [blame] | 767 | can_skb_prv(skb)->skbcnt = 0; |
Oliver Hartkopp | 156c2bb | 2013-01-17 18:43:39 +0100 | [diff] [blame] | 768 | |
Al Viro | 6ce8e9c | 2014-04-06 21:25:44 -0400 | [diff] [blame] | 769 | err = memcpy_from_msg(skb_put(skb, size), msg, size); |
Ilpo Järvinen | ebad5c0 | 2008-12-14 23:16:58 -0800 | [diff] [blame] | 770 | if (err < 0) |
| 771 | goto free_skb; |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 772 | |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 773 | sock_tx_timestamp(sk, sk->sk_tsflags, &skb_shinfo(skb)->tx_flags); |
Oliver Hartkopp | cff0d6e | 2010-08-03 00:31:48 -0700 | [diff] [blame] | 774 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 775 | skb->dev = dev; |
| 776 | skb->sk = sk; |
Rostislav Lisovy | bb5ecb0 | 2014-01-24 13:17:37 +0100 | [diff] [blame] | 777 | skb->priority = sk->sk_priority; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 778 | |
| 779 | err = can_send(skb, ro->loopback); |
| 780 | |
| 781 | dev_put(dev); |
| 782 | |
| 783 | if (err) |
Ilpo Järvinen | ebad5c0 | 2008-12-14 23:16:58 -0800 | [diff] [blame] | 784 | goto send_failed; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 785 | |
| 786 | return size; |
Ilpo Järvinen | ebad5c0 | 2008-12-14 23:16:58 -0800 | [diff] [blame] | 787 | |
| 788 | free_skb: |
| 789 | kfree_skb(skb); |
| 790 | put_dev: |
| 791 | dev_put(dev); |
| 792 | send_failed: |
| 793 | return err; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 794 | } |
| 795 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 796 | static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
| 797 | int flags) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 798 | { |
| 799 | struct sock *sk = sock->sk; |
| 800 | struct sk_buff *skb; |
Urs Thuermann | a219994 | 2008-02-07 18:05:04 -0800 | [diff] [blame] | 801 | int err = 0; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 802 | int noblock; |
| 803 | |
| 804 | noblock = flags & MSG_DONTWAIT; |
| 805 | flags &= ~MSG_DONTWAIT; |
| 806 | |
Urs Thuermann | a219994 | 2008-02-07 18:05:04 -0800 | [diff] [blame] | 807 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 808 | if (!skb) |
Urs Thuermann | a219994 | 2008-02-07 18:05:04 -0800 | [diff] [blame] | 809 | return err; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 810 | |
Oliver Hartkopp | 821047c | 2014-03-01 15:31:53 +0100 | [diff] [blame] | 811 | if (size < skb->len) |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 812 | msg->msg_flags |= MSG_TRUNC; |
| 813 | else |
Oliver Hartkopp | 821047c | 2014-03-01 15:31:53 +0100 | [diff] [blame] | 814 | size = skb->len; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 815 | |
Al Viro | 7eab8d9 | 2014-04-06 21:51:23 -0400 | [diff] [blame] | 816 | err = memcpy_to_msg(msg, skb->data, size); |
Urs Thuermann | a219994 | 2008-02-07 18:05:04 -0800 | [diff] [blame] | 817 | if (err < 0) { |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 818 | skb_free_datagram(sk, skb); |
Urs Thuermann | a219994 | 2008-02-07 18:05:04 -0800 | [diff] [blame] | 819 | return err; |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 820 | } |
| 821 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 822 | sock_recv_ts_and_drops(msg, sk, skb); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 823 | |
| 824 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 825 | __sockaddr_check_size(sizeof(struct sockaddr_can)); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 826 | msg->msg_namelen = sizeof(struct sockaddr_can); |
| 827 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); |
| 828 | } |
| 829 | |
Oliver Hartkopp | 1e55659 | 2010-10-19 09:32:04 +0000 | [diff] [blame] | 830 | /* assign the flags that have been recorded in raw_rcv() */ |
| 831 | msg->msg_flags |= *(raw_flags(skb)); |
| 832 | |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 833 | skb_free_datagram(sk, skb); |
| 834 | |
| 835 | return size; |
| 836 | } |
| 837 | |
Oliver Hartkopp | 53914b6 | 2011-03-22 08:27:25 +0000 | [diff] [blame] | 838 | static const struct proto_ops raw_ops = { |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 839 | .family = PF_CAN, |
| 840 | .release = raw_release, |
| 841 | .bind = raw_bind, |
| 842 | .connect = sock_no_connect, |
| 843 | .socketpair = sock_no_socketpair, |
| 844 | .accept = sock_no_accept, |
| 845 | .getname = raw_getname, |
| 846 | .poll = datagram_poll, |
Oliver Hartkopp | 53914b6 | 2011-03-22 08:27:25 +0000 | [diff] [blame] | 847 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 848 | .listen = sock_no_listen, |
| 849 | .shutdown = sock_no_shutdown, |
| 850 | .setsockopt = raw_setsockopt, |
| 851 | .getsockopt = raw_getsockopt, |
| 852 | .sendmsg = raw_sendmsg, |
| 853 | .recvmsg = raw_recvmsg, |
| 854 | .mmap = sock_no_mmap, |
| 855 | .sendpage = sock_no_sendpage, |
| 856 | }; |
| 857 | |
| 858 | static struct proto raw_proto __read_mostly = { |
| 859 | .name = "CAN_RAW", |
| 860 | .owner = THIS_MODULE, |
| 861 | .obj_size = sizeof(struct raw_sock), |
| 862 | .init = raw_init, |
| 863 | }; |
| 864 | |
Kurt Van Dijck | 1650629 | 2011-05-03 18:40:57 +0000 | [diff] [blame] | 865 | static const struct can_proto raw_can_proto = { |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 866 | .type = SOCK_RAW, |
| 867 | .protocol = CAN_RAW, |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 868 | .ops = &raw_ops, |
| 869 | .prot = &raw_proto, |
| 870 | }; |
| 871 | |
| 872 | static __init int raw_module_init(void) |
| 873 | { |
| 874 | int err; |
| 875 | |
Jeremiah Mahler | b111b78 | 2014-11-21 23:42:35 -0800 | [diff] [blame] | 876 | pr_info("can: raw protocol (rev " CAN_RAW_VERSION ")\n"); |
Oliver Hartkopp | c18ce10 | 2007-11-16 15:53:09 -0800 | [diff] [blame] | 877 | |
| 878 | err = can_proto_register(&raw_can_proto); |
| 879 | if (err < 0) |
| 880 | printk(KERN_ERR "can: registration of raw protocol failed\n"); |
| 881 | |
| 882 | return err; |
| 883 | } |
| 884 | |
| 885 | static __exit void raw_module_exit(void) |
| 886 | { |
| 887 | can_proto_unregister(&raw_can_proto); |
| 888 | } |
| 889 | |
| 890 | module_init(raw_module_init); |
| 891 | module_exit(raw_module_exit); |