Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * PACKET - implements raw packet sockets. |
| 7 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 8 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| 11 | * |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 12 | * Fixes: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Alan Cox : verify_area() now used correctly |
| 14 | * Alan Cox : new skbuff lists, look ma no backlogs! |
| 15 | * Alan Cox : tidied skbuff lists. |
| 16 | * Alan Cox : Now uses generic datagram routines I |
| 17 | * added. Also fixed the peek/read crash |
| 18 | * from all old Linux datagram code. |
| 19 | * Alan Cox : Uses the improved datagram code. |
| 20 | * Alan Cox : Added NULL's for socket options. |
| 21 | * Alan Cox : Re-commented the code. |
| 22 | * Alan Cox : Use new kernel side addressing |
| 23 | * Rob Janssen : Correct MTU usage. |
| 24 | * Dave Platt : Counter leaks caused by incorrect |
| 25 | * interrupt locking and some slightly |
| 26 | * dubious gcc output. Can you read |
| 27 | * compiler: it said _VOLATILE_ |
| 28 | * Richard Kooijman : Timestamp fixes. |
| 29 | * Alan Cox : New buffers. Use sk->mac.raw. |
| 30 | * Alan Cox : sendmsg/recvmsg support. |
| 31 | * Alan Cox : Protocol setting support |
| 32 | * Alexey Kuznetsov : Untied from IPv4 stack. |
| 33 | * Cyrus Durgin : Fixed kerneld for kmod. |
| 34 | * Michal Ostrowski : Module initialization cleanup. |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 35 | * Ulises Alonso : Frame number limit removal and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | * packet_set_ring memory leak. |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
| 38 | * The convention is that longer addresses |
| 39 | * will simply extend the hardware address |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 40 | * byte arrays at the end of sockaddr_ll |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 41 | * and packet_mreq. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | * |
| 43 | * This program is free software; you can redistribute it and/or |
| 44 | * modify it under the terms of the GNU General Public License |
| 45 | * as published by the Free Software Foundation; either version |
| 46 | * 2 of the License, or (at your option) any later version. |
| 47 | * |
| 48 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <linux/mm.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 52 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <linux/fcntl.h> |
| 54 | #include <linux/socket.h> |
| 55 | #include <linux/in.h> |
| 56 | #include <linux/inet.h> |
| 57 | #include <linux/netdevice.h> |
| 58 | #include <linux/if_packet.h> |
| 59 | #include <linux/wireless.h> |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 60 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <linux/kmod.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 62 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | #include <net/ip.h> |
| 64 | #include <net/protocol.h> |
| 65 | #include <linux/skbuff.h> |
| 66 | #include <net/sock.h> |
| 67 | #include <linux/errno.h> |
| 68 | #include <linux/timer.h> |
| 69 | #include <asm/system.h> |
| 70 | #include <asm/uaccess.h> |
| 71 | #include <asm/ioctls.h> |
| 72 | #include <asm/page.h> |
Al Viro | a1f8e7f | 2006-10-19 16:08:53 -0400 | [diff] [blame] | 73 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | #include <asm/io.h> |
| 75 | #include <linux/proc_fs.h> |
| 76 | #include <linux/seq_file.h> |
| 77 | #include <linux/poll.h> |
| 78 | #include <linux/module.h> |
| 79 | #include <linux/init.h> |
| 80 | |
| 81 | #ifdef CONFIG_INET |
| 82 | #include <net/inet_common.h> |
| 83 | #endif |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | Assumptions: |
| 87 | - if device has no dev->hard_header routine, it adds and removes ll header |
| 88 | inside itself. In this case ll header is invisible outside of device, |
| 89 | but higher levels still should reserve dev->hard_header_len. |
| 90 | Some devices are enough clever to reallocate skb, when header |
| 91 | will not fit to reserved space (tunnel), another ones are silly |
| 92 | (PPP). |
| 93 | - packet socket receives packets with pulled ll header, |
| 94 | so that SOCK_RAW should push it back. |
| 95 | |
| 96 | On receive: |
| 97 | ----------- |
| 98 | |
| 99 | Incoming, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 100 | mac_header -> ll header |
| 101 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | Outgoing, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 104 | mac_header -> ll header |
| 105 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
| 107 | Incoming, dev->hard_header==NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 108 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
| 109 | header. PPP makes it, that is wrong, because introduce |
YOSHIFUJI Hideaki | db0c58f | 2007-07-19 10:44:35 +0900 | [diff] [blame] | 110 | assymetry between rx and tx paths. |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 111 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
| 113 | Outgoing, dev->hard_header==NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 114 | mac_header -> data. ll header is still not built! |
| 115 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
| 117 | Resume |
| 118 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. |
| 119 | |
| 120 | |
| 121 | On transmit: |
| 122 | ------------ |
| 123 | |
| 124 | dev->hard_header != NULL |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 125 | mac_header -> ll header |
| 126 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | dev->hard_header == NULL (ll header is added by device, we cannot control it) |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 129 | mac_header -> data |
| 130 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
| 132 | We should set nh.raw on output to correct posistion, |
| 133 | packet classifier depends on it. |
| 134 | */ |
| 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | /* Private packet socket structures. */ |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | struct packet_mclist |
| 139 | { |
| 140 | struct packet_mclist *next; |
| 141 | int ifindex; |
| 142 | int count; |
| 143 | unsigned short type; |
| 144 | unsigned short alen; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 145 | unsigned char addr[MAX_ADDR_LEN]; |
| 146 | }; |
| 147 | /* identical to struct packet_mreq except it has |
| 148 | * a longer address field. |
| 149 | */ |
| 150 | struct packet_mreq_max |
| 151 | { |
| 152 | int mr_ifindex; |
| 153 | unsigned short mr_type; |
| 154 | unsigned short mr_alen; |
| 155 | unsigned char mr_address[MAX_ADDR_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | }; |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | #ifdef CONFIG_PACKET_MMAP |
| 159 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing); |
| 160 | #endif |
| 161 | |
| 162 | static void packet_flush_mclist(struct sock *sk); |
| 163 | |
| 164 | struct packet_sock { |
| 165 | /* struct sock has to be the first member of packet_sock */ |
| 166 | struct sock sk; |
| 167 | struct tpacket_stats stats; |
| 168 | #ifdef CONFIG_PACKET_MMAP |
| 169 | char * *pg_vec; |
| 170 | unsigned int head; |
| 171 | unsigned int frames_per_block; |
| 172 | unsigned int frame_size; |
| 173 | unsigned int frame_max; |
| 174 | int copy_thresh; |
| 175 | #endif |
| 176 | struct packet_type prot_hook; |
| 177 | spinlock_t bind_lock; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 178 | unsigned int running:1, /* prot_hook is attached*/ |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 179 | auxdata:1, |
| 180 | origdev:1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | int ifindex; /* bound device */ |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 182 | __be16 num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | struct packet_mclist *mclist; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | #ifdef CONFIG_PACKET_MMAP |
| 185 | atomic_t mapped; |
| 186 | unsigned int pg_vec_order; |
| 187 | unsigned int pg_vec_pages; |
| 188 | unsigned int pg_vec_len; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 189 | enum tpacket_versions tp_version; |
| 190 | unsigned int tp_hdrlen; |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 191 | unsigned int tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | #endif |
| 193 | }; |
| 194 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 195 | struct packet_skb_cb { |
| 196 | unsigned int origlen; |
| 197 | union { |
| 198 | struct sockaddr_pkt pkt; |
| 199 | struct sockaddr_ll ll; |
| 200 | } sa; |
| 201 | }; |
| 202 | |
| 203 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | #ifdef CONFIG_PACKET_MMAP |
| 206 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 207 | static void *packet_lookup_frame(struct packet_sock *po, unsigned int position, |
| 208 | int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | { |
| 210 | unsigned int pg_vec_pos, frame_offset; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 211 | union { |
| 212 | struct tpacket_hdr *h1; |
| 213 | struct tpacket2_hdr *h2; |
| 214 | void *raw; |
| 215 | } h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
| 217 | pg_vec_pos = position / po->frames_per_block; |
| 218 | frame_offset = position % po->frames_per_block; |
| 219 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 220 | h.raw = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size); |
| 221 | switch (po->tp_version) { |
| 222 | case TPACKET_V1: |
| 223 | if (status != h.h1->tp_status ? TP_STATUS_USER : |
| 224 | TP_STATUS_KERNEL) |
| 225 | return NULL; |
| 226 | break; |
| 227 | case TPACKET_V2: |
| 228 | if (status != h.h2->tp_status ? TP_STATUS_USER : |
| 229 | TP_STATUS_KERNEL) |
| 230 | return NULL; |
| 231 | break; |
| 232 | } |
| 233 | return h.raw; |
| 234 | } |
| 235 | |
| 236 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
| 237 | { |
| 238 | union { |
| 239 | struct tpacket_hdr *h1; |
| 240 | struct tpacket2_hdr *h2; |
| 241 | void *raw; |
| 242 | } h; |
| 243 | |
| 244 | h.raw = frame; |
| 245 | switch (po->tp_version) { |
| 246 | case TPACKET_V1: |
| 247 | h.h1->tp_status = status; |
| 248 | break; |
| 249 | case TPACKET_V2: |
| 250 | h.h2->tp_status = status; |
| 251 | break; |
| 252 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | #endif |
| 255 | |
| 256 | static inline struct packet_sock *pkt_sk(struct sock *sk) |
| 257 | { |
| 258 | return (struct packet_sock *)sk; |
| 259 | } |
| 260 | |
| 261 | static void packet_sock_destruct(struct sock *sk) |
| 262 | { |
| 263 | BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); |
| 264 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); |
| 265 | |
| 266 | if (!sock_flag(sk, SOCK_DEAD)) { |
| 267 | printk("Attempt to release alive packet socket: %p\n", sk); |
| 268 | return; |
| 269 | } |
| 270 | |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 271 | sk_refcnt_debug_dec(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 275 | static const struct proto_ops packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 277 | static const struct proto_ops packet_ops_spkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 279 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
| 281 | struct sock *sk; |
| 282 | struct sockaddr_pkt *spkt; |
| 283 | |
| 284 | /* |
| 285 | * When we registered the protocol we saved the socket in the data |
| 286 | * field for just this event. |
| 287 | */ |
| 288 | |
| 289 | sk = pt->af_packet_priv; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | /* |
| 292 | * Yank back the headers [hope the device set this |
| 293 | * right or kerboom...] |
| 294 | * |
| 295 | * Incoming packets have ll header pulled, |
| 296 | * push it back. |
| 297 | * |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 298 | * For outgoing ones skb->data == skb_mac_header(skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | * so that this procedure is noop. |
| 300 | */ |
| 301 | |
| 302 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 303 | goto out; |
| 304 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 305 | if (dev_net(dev) != sock_net(sk)) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 306 | goto out; |
| 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| 309 | goto oom; |
| 310 | |
| 311 | /* drop any routing info */ |
| 312 | dst_release(skb->dst); |
| 313 | skb->dst = NULL; |
| 314 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 315 | /* drop conntrack reference */ |
| 316 | nf_reset(skb); |
| 317 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 318 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 320 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | /* |
| 323 | * The SOCK_PACKET socket receives _all_ frames. |
| 324 | */ |
| 325 | |
| 326 | spkt->spkt_family = dev->type; |
| 327 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); |
| 328 | spkt->spkt_protocol = skb->protocol; |
| 329 | |
| 330 | /* |
| 331 | * Charge the memory to the socket. This is done specifically |
| 332 | * to prevent sockets using all the memory up. |
| 333 | */ |
| 334 | |
| 335 | if (sock_queue_rcv_skb(sk,skb) == 0) |
| 336 | return 0; |
| 337 | |
| 338 | out: |
| 339 | kfree_skb(skb); |
| 340 | oom: |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | |
| 345 | /* |
| 346 | * Output a raw packet to a device layer. This bypasses all the other |
| 347 | * protocol layers and you must therefore supply it with a complete frame |
| 348 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
| 351 | struct msghdr *msg, size_t len) |
| 352 | { |
| 353 | struct sock *sk = sock->sk; |
| 354 | struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name; |
| 355 | struct sk_buff *skb; |
| 356 | struct net_device *dev; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 357 | __be16 proto=0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | int err; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 361 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | */ |
| 363 | |
| 364 | if (saddr) |
| 365 | { |
| 366 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
| 367 | return(-EINVAL); |
| 368 | if (msg->msg_namelen==sizeof(struct sockaddr_pkt)) |
| 369 | proto=saddr->spkt_protocol; |
| 370 | } |
| 371 | else |
| 372 | return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */ |
| 373 | |
| 374 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 375 | * Find the device first to size check it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | */ |
| 377 | |
| 378 | saddr->spkt_device[13] = 0; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 379 | dev = dev_get_by_name(sock_net(sk), saddr->spkt_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | err = -ENODEV; |
| 381 | if (dev == NULL) |
| 382 | goto out_unlock; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 383 | |
David S. Miller | d5e76b0 | 2007-01-25 19:30:36 -0800 | [diff] [blame] | 384 | err = -ENETDOWN; |
| 385 | if (!(dev->flags & IFF_UP)) |
| 386 | goto out_unlock; |
| 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | /* |
| 389 | * You may not queue a frame bigger than the mtu. This is the lowest level |
| 390 | * raw protocol and you must do your own fragmentation at this level. |
| 391 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | err = -EMSGSIZE; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 394 | if (len > dev->mtu + dev->hard_header_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | goto out_unlock; |
| 396 | |
| 397 | err = -ENOBUFS; |
| 398 | skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); |
| 399 | |
| 400 | /* |
| 401 | * If the write buffer is full, then tough. At this level the user gets to |
| 402 | * deal with the problem - do your own algorithmic backoffs. That's far |
| 403 | * more flexible. |
| 404 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 405 | |
| 406 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | goto out_unlock; |
| 408 | |
| 409 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 410 | * Fill it in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | /* FIXME: Save some space for broken drivers that write a |
| 414 | * hard header at transmission time by themselves. PPP is the |
| 415 | * notable one here. This should really be fixed at the driver level. |
| 416 | */ |
| 417 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 418 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
| 420 | /* Try to align data part correctly */ |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 421 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | skb->data -= dev->hard_header_len; |
| 423 | skb->tail -= dev->hard_header_len; |
| 424 | if (len < dev->hard_header_len) |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 425 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | /* Returns -EFAULT on error */ |
| 429 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); |
| 430 | skb->protocol = proto; |
| 431 | skb->dev = dev; |
| 432 | skb->priority = sk->sk_priority; |
| 433 | if (err) |
| 434 | goto out_free; |
| 435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | /* |
| 437 | * Now send it |
| 438 | */ |
| 439 | |
| 440 | dev_queue_xmit(skb); |
| 441 | dev_put(dev); |
| 442 | return(len); |
| 443 | |
| 444 | out_free: |
| 445 | kfree_skb(skb); |
| 446 | out_unlock: |
| 447 | if (dev) |
| 448 | dev_put(dev); |
| 449 | return err; |
| 450 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 452 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
| 453 | unsigned int res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | { |
| 455 | struct sk_filter *filter; |
| 456 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 457 | rcu_read_lock_bh(); |
| 458 | filter = rcu_dereference(sk->sk_filter); |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 459 | if (filter != NULL) |
| 460 | res = sk_run_filter(skb, filter->insns, filter->len); |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 461 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 463 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | /* |
| 467 | This function makes lazy skb cloning in hope that most of packets |
| 468 | are discarded by BPF. |
| 469 | |
| 470 | Note tricky part: we DO mangle shared skb! skb->data, skb->len |
| 471 | and skb->cb are mangled. It works because (and until) packets |
| 472 | falling here are owned by current CPU. Output packets are cloned |
| 473 | by dev_queue_xmit_nit(), input packets are processed by net_bh |
| 474 | sequencially, so that if we return skb to original state on exit, |
| 475 | we will not harm anyone. |
| 476 | */ |
| 477 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 478 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
| 480 | struct sock *sk; |
| 481 | struct sockaddr_ll *sll; |
| 482 | struct packet_sock *po; |
| 483 | u8 * skb_head = skb->data; |
| 484 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 485 | unsigned int snaplen, res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | |
| 487 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 488 | goto drop; |
| 489 | |
| 490 | sk = pt->af_packet_priv; |
| 491 | po = pkt_sk(sk); |
| 492 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 493 | if (dev_net(dev) != sock_net(sk)) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 494 | goto drop; |
| 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | skb->dev = dev; |
| 497 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 498 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | /* The device has an explicit notion of ll header, |
| 500 | exported to higher levels. |
| 501 | |
| 502 | Otherwise, the device hides datails of it frame |
| 503 | structure, so that corresponding packet head |
| 504 | never delivered to user. |
| 505 | */ |
| 506 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 507 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 509 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 510 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | } |
| 512 | } |
| 513 | |
| 514 | snaplen = skb->len; |
| 515 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 516 | res = run_filter(skb, sk, snaplen); |
| 517 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 518 | goto drop_n_restore; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 519 | if (snaplen > res) |
| 520 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
| 522 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
| 523 | (unsigned)sk->sk_rcvbuf) |
| 524 | goto drop_n_acct; |
| 525 | |
| 526 | if (skb_shared(skb)) { |
| 527 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); |
| 528 | if (nskb == NULL) |
| 529 | goto drop_n_acct; |
| 530 | |
| 531 | if (skb_head != skb->data) { |
| 532 | skb->data = skb_head; |
| 533 | skb->len = skb_len; |
| 534 | } |
| 535 | kfree_skb(skb); |
| 536 | skb = nskb; |
| 537 | } |
| 538 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 539 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
| 540 | sizeof(skb->cb)); |
| 541 | |
| 542 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | sll->sll_family = AF_PACKET; |
| 544 | sll->sll_hatype = dev->type; |
| 545 | sll->sll_protocol = skb->protocol; |
| 546 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 547 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 548 | sll->sll_ifindex = orig_dev->ifindex; |
| 549 | else |
| 550 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 552 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 554 | PACKET_SKB_CB(skb)->origlen = skb->len; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 555 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | if (pskb_trim(skb, snaplen)) |
| 557 | goto drop_n_acct; |
| 558 | |
| 559 | skb_set_owner_r(skb, sk); |
| 560 | skb->dev = NULL; |
| 561 | dst_release(skb->dst); |
| 562 | skb->dst = NULL; |
| 563 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 564 | /* drop conntrack reference */ |
| 565 | nf_reset(skb); |
| 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | spin_lock(&sk->sk_receive_queue.lock); |
| 568 | po->stats.tp_packets++; |
| 569 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
| 570 | spin_unlock(&sk->sk_receive_queue.lock); |
| 571 | sk->sk_data_ready(sk, skb->len); |
| 572 | return 0; |
| 573 | |
| 574 | drop_n_acct: |
| 575 | spin_lock(&sk->sk_receive_queue.lock); |
| 576 | po->stats.tp_drops++; |
| 577 | spin_unlock(&sk->sk_receive_queue.lock); |
| 578 | |
| 579 | drop_n_restore: |
| 580 | if (skb_head != skb->data && skb_shared(skb)) { |
| 581 | skb->data = skb_head; |
| 582 | skb->len = skb_len; |
| 583 | } |
| 584 | drop: |
| 585 | kfree_skb(skb); |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | #ifdef CONFIG_PACKET_MMAP |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 590 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | { |
| 592 | struct sock *sk; |
| 593 | struct packet_sock *po; |
| 594 | struct sockaddr_ll *sll; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 595 | union { |
| 596 | struct tpacket_hdr *h1; |
| 597 | struct tpacket2_hdr *h2; |
| 598 | void *raw; |
| 599 | } h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | u8 * skb_head = skb->data; |
| 601 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 602 | unsigned int snaplen, res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 604 | unsigned short macoff, netoff, hdrlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | struct sk_buff *copy_skb = NULL; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 606 | struct timeval tv; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 607 | struct timespec ts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
| 609 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 610 | goto drop; |
| 611 | |
| 612 | sk = pt->af_packet_priv; |
| 613 | po = pkt_sk(sk); |
| 614 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 615 | if (dev_net(dev) != sock_net(sk)) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 616 | goto drop; |
| 617 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 618 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 620 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 622 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 623 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | } |
| 625 | } |
| 626 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 627 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 628 | status |= TP_STATUS_CSUMNOTREADY; |
| 629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | snaplen = skb->len; |
| 631 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 632 | res = run_filter(skb, sk, snaplen); |
| 633 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 634 | goto drop_n_restore; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 635 | if (snaplen > res) |
| 636 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
| 638 | if (sk->sk_type == SOCK_DGRAM) { |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 639 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
| 640 | po->tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | } else { |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 642 | unsigned maclen = skb_network_offset(skb); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 643 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 644 | (maclen < 16 ? 16 : maclen)) + |
| 645 | po->tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | macoff = netoff - maclen; |
| 647 | } |
| 648 | |
| 649 | if (macoff + snaplen > po->frame_size) { |
| 650 | if (po->copy_thresh && |
| 651 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < |
| 652 | (unsigned)sk->sk_rcvbuf) { |
| 653 | if (skb_shared(skb)) { |
| 654 | copy_skb = skb_clone(skb, GFP_ATOMIC); |
| 655 | } else { |
| 656 | copy_skb = skb_get(skb); |
| 657 | skb_head = skb->data; |
| 658 | } |
| 659 | if (copy_skb) |
| 660 | skb_set_owner_r(copy_skb, sk); |
| 661 | } |
| 662 | snaplen = po->frame_size - macoff; |
| 663 | if ((int)snaplen < 0) |
| 664 | snaplen = 0; |
| 665 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
| 667 | spin_lock(&sk->sk_receive_queue.lock); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 668 | h.raw = packet_lookup_frame(po, po->head, TP_STATUS_KERNEL); |
| 669 | if (!h.raw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | goto ring_is_full; |
| 671 | po->head = po->head != po->frame_max ? po->head+1 : 0; |
| 672 | po->stats.tp_packets++; |
| 673 | if (copy_skb) { |
| 674 | status |= TP_STATUS_COPY; |
| 675 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); |
| 676 | } |
| 677 | if (!po->stats.tp_drops) |
| 678 | status &= ~TP_STATUS_LOSING; |
| 679 | spin_unlock(&sk->sk_receive_queue.lock); |
| 680 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 681 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 683 | switch (po->tp_version) { |
| 684 | case TPACKET_V1: |
| 685 | h.h1->tp_len = skb->len; |
| 686 | h.h1->tp_snaplen = snaplen; |
| 687 | h.h1->tp_mac = macoff; |
| 688 | h.h1->tp_net = netoff; |
| 689 | if (skb->tstamp.tv64) |
| 690 | tv = ktime_to_timeval(skb->tstamp); |
| 691 | else |
| 692 | do_gettimeofday(&tv); |
| 693 | h.h1->tp_sec = tv.tv_sec; |
| 694 | h.h1->tp_usec = tv.tv_usec; |
| 695 | hdrlen = sizeof(*h.h1); |
| 696 | break; |
| 697 | case TPACKET_V2: |
| 698 | h.h2->tp_len = skb->len; |
| 699 | h.h2->tp_snaplen = snaplen; |
| 700 | h.h2->tp_mac = macoff; |
| 701 | h.h2->tp_net = netoff; |
| 702 | if (skb->tstamp.tv64) |
| 703 | ts = ktime_to_timespec(skb->tstamp); |
| 704 | else |
| 705 | getnstimeofday(&ts); |
| 706 | h.h2->tp_sec = ts.tv_sec; |
| 707 | h.h2->tp_nsec = ts.tv_nsec; |
Patrick McHardy | 393e52e | 2008-07-14 22:50:39 -0700 | [diff] [blame] | 708 | h.h2->tp_vlan_tci = skb->vlan_tci; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 709 | hdrlen = sizeof(*h.h2); |
| 710 | break; |
| 711 | default: |
| 712 | BUG(); |
| 713 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 715 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 716 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | sll->sll_family = AF_PACKET; |
| 718 | sll->sll_hatype = dev->type; |
| 719 | sll->sll_protocol = skb->protocol; |
| 720 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 721 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 722 | sll->sll_ifindex = orig_dev->ifindex; |
| 723 | else |
| 724 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 726 | __packet_set_status(po, h.raw, status); |
Ralf Baechle | e16aa20 | 2006-12-07 00:11:33 -0800 | [diff] [blame] | 727 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | { |
| 730 | struct page *p_start, *p_end; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 731 | u8 *h_end = h.raw + macoff + snaplen - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 733 | p_start = virt_to_page(h.raw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | p_end = virt_to_page(h_end); |
| 735 | while (p_start <= p_end) { |
| 736 | flush_dcache_page(p_start); |
| 737 | p_start++; |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | sk->sk_data_ready(sk, 0); |
| 742 | |
| 743 | drop_n_restore: |
| 744 | if (skb_head != skb->data && skb_shared(skb)) { |
| 745 | skb->data = skb_head; |
| 746 | skb->len = skb_len; |
| 747 | } |
| 748 | drop: |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 749 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | return 0; |
| 751 | |
| 752 | ring_is_full: |
| 753 | po->stats.tp_drops++; |
| 754 | spin_unlock(&sk->sk_receive_queue.lock); |
| 755 | |
| 756 | sk->sk_data_ready(sk, 0); |
| 757 | if (copy_skb) |
| 758 | kfree_skb(copy_skb); |
| 759 | goto drop_n_restore; |
| 760 | } |
| 761 | |
| 762 | #endif |
| 763 | |
| 764 | |
| 765 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 766 | struct msghdr *msg, size_t len) |
| 767 | { |
| 768 | struct sock *sk = sock->sk; |
| 769 | struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; |
| 770 | struct sk_buff *skb; |
| 771 | struct net_device *dev; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 772 | __be16 proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | unsigned char *addr; |
| 774 | int ifindex, err, reserve = 0; |
| 775 | |
| 776 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 777 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | if (saddr == NULL) { |
| 781 | struct packet_sock *po = pkt_sk(sk); |
| 782 | |
| 783 | ifindex = po->ifindex; |
| 784 | proto = po->num; |
| 785 | addr = NULL; |
| 786 | } else { |
| 787 | err = -EINVAL; |
| 788 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| 789 | goto out; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 790 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
| 791 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | ifindex = saddr->sll_ifindex; |
| 793 | proto = saddr->sll_protocol; |
| 794 | addr = saddr->sll_addr; |
| 795 | } |
| 796 | |
| 797 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 798 | dev = dev_get_by_index(sock_net(sk), ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | err = -ENXIO; |
| 800 | if (dev == NULL) |
| 801 | goto out_unlock; |
| 802 | if (sock->type == SOCK_RAW) |
| 803 | reserve = dev->hard_header_len; |
| 804 | |
David S. Miller | d5e76b0 | 2007-01-25 19:30:36 -0800 | [diff] [blame] | 805 | err = -ENETDOWN; |
| 806 | if (!(dev->flags & IFF_UP)) |
| 807 | goto out_unlock; |
| 808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | err = -EMSGSIZE; |
| 810 | if (len > dev->mtu+reserve) |
| 811 | goto out_unlock; |
| 812 | |
Johannes Berg | f5184d2 | 2008-05-12 20:48:31 -0700 | [diff] [blame] | 813 | skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | msg->msg_flags & MSG_DONTWAIT, &err); |
| 815 | if (skb==NULL) |
| 816 | goto out_unlock; |
| 817 | |
| 818 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 819 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 821 | err = -EINVAL; |
| 822 | if (sock->type == SOCK_DGRAM && |
| 823 | dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0) |
| 824 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
| 826 | /* Returns -EFAULT on error */ |
| 827 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); |
| 828 | if (err) |
| 829 | goto out_free; |
| 830 | |
| 831 | skb->protocol = proto; |
| 832 | skb->dev = dev; |
| 833 | skb->priority = sk->sk_priority; |
| 834 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | /* |
| 836 | * Now send it |
| 837 | */ |
| 838 | |
| 839 | err = dev_queue_xmit(skb); |
| 840 | if (err > 0 && (err = net_xmit_errno(err)) != 0) |
| 841 | goto out_unlock; |
| 842 | |
| 843 | dev_put(dev); |
| 844 | |
| 845 | return(len); |
| 846 | |
| 847 | out_free: |
| 848 | kfree_skb(skb); |
| 849 | out_unlock: |
| 850 | if (dev) |
| 851 | dev_put(dev); |
| 852 | out: |
| 853 | return err; |
| 854 | } |
| 855 | |
| 856 | /* |
| 857 | * Close a PACKET socket. This is fairly simple. We immediately go |
| 858 | * to 'closed' state and remove our protocol entry in the device list. |
| 859 | */ |
| 860 | |
| 861 | static int packet_release(struct socket *sock) |
| 862 | { |
| 863 | struct sock *sk = sock->sk; |
| 864 | struct packet_sock *po; |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 865 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | |
| 867 | if (!sk) |
| 868 | return 0; |
| 869 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 870 | net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | po = pkt_sk(sk); |
| 872 | |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 873 | write_lock_bh(&net->packet.sklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | sk_del_node_init(sk); |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 875 | write_unlock_bh(&net->packet.sklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
| 877 | /* |
| 878 | * Unhook packet receive handler. |
| 879 | */ |
| 880 | |
| 881 | if (po->running) { |
| 882 | /* |
| 883 | * Remove the protocol hook |
| 884 | */ |
| 885 | dev_remove_pack(&po->prot_hook); |
| 886 | po->running = 0; |
| 887 | po->num = 0; |
| 888 | __sock_put(sk); |
| 889 | } |
| 890 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | packet_flush_mclist(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | |
| 893 | #ifdef CONFIG_PACKET_MMAP |
| 894 | if (po->pg_vec) { |
| 895 | struct tpacket_req req; |
| 896 | memset(&req, 0, sizeof(req)); |
| 897 | packet_set_ring(sk, &req, 1); |
| 898 | } |
| 899 | #endif |
| 900 | |
| 901 | /* |
| 902 | * Now the socket is dead. No more input will appear. |
| 903 | */ |
| 904 | |
| 905 | sock_orphan(sk); |
| 906 | sock->sk = NULL; |
| 907 | |
| 908 | /* Purge queues */ |
| 909 | |
| 910 | skb_queue_purge(&sk->sk_receive_queue); |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 911 | sk_refcnt_debug_release(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
| 913 | sock_put(sk); |
| 914 | return 0; |
| 915 | } |
| 916 | |
| 917 | /* |
| 918 | * Attach a packet hook. |
| 919 | */ |
| 920 | |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 921 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | { |
| 923 | struct packet_sock *po = pkt_sk(sk); |
| 924 | /* |
| 925 | * Detach an existing hook if present. |
| 926 | */ |
| 927 | |
| 928 | lock_sock(sk); |
| 929 | |
| 930 | spin_lock(&po->bind_lock); |
| 931 | if (po->running) { |
| 932 | __sock_put(sk); |
| 933 | po->running = 0; |
| 934 | po->num = 0; |
| 935 | spin_unlock(&po->bind_lock); |
| 936 | dev_remove_pack(&po->prot_hook); |
| 937 | spin_lock(&po->bind_lock); |
| 938 | } |
| 939 | |
| 940 | po->num = protocol; |
| 941 | po->prot_hook.type = protocol; |
| 942 | po->prot_hook.dev = dev; |
| 943 | |
| 944 | po->ifindex = dev ? dev->ifindex : 0; |
| 945 | |
| 946 | if (protocol == 0) |
| 947 | goto out_unlock; |
| 948 | |
Urs Thuermann | be85d4a | 2007-11-12 21:05:20 -0800 | [diff] [blame] | 949 | if (!dev || (dev->flags & IFF_UP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | dev_add_pack(&po->prot_hook); |
| 951 | sock_hold(sk); |
| 952 | po->running = 1; |
Urs Thuermann | be85d4a | 2007-11-12 21:05:20 -0800 | [diff] [blame] | 953 | } else { |
| 954 | sk->sk_err = ENETDOWN; |
| 955 | if (!sock_flag(sk, SOCK_DEAD)) |
| 956 | sk->sk_error_report(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | } |
| 958 | |
| 959 | out_unlock: |
| 960 | spin_unlock(&po->bind_lock); |
| 961 | release_sock(sk); |
| 962 | return 0; |
| 963 | } |
| 964 | |
| 965 | /* |
| 966 | * Bind a packet socket to a device |
| 967 | */ |
| 968 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 970 | { |
| 971 | struct sock *sk=sock->sk; |
| 972 | char name[15]; |
| 973 | struct net_device *dev; |
| 974 | int err = -ENODEV; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 975 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | /* |
| 977 | * Check legality |
| 978 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 979 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 980 | if (addr_len != sizeof(struct sockaddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | return -EINVAL; |
| 982 | strlcpy(name,uaddr->sa_data,sizeof(name)); |
| 983 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 984 | dev = dev_get_by_name(sock_net(sk), name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | if (dev) { |
| 986 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
| 987 | dev_put(dev); |
| 988 | } |
| 989 | return err; |
| 990 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | |
| 992 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 993 | { |
| 994 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; |
| 995 | struct sock *sk=sock->sk; |
| 996 | struct net_device *dev = NULL; |
| 997 | int err; |
| 998 | |
| 999 | |
| 1000 | /* |
| 1001 | * Check legality |
| 1002 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | if (addr_len < sizeof(struct sockaddr_ll)) |
| 1005 | return -EINVAL; |
| 1006 | if (sll->sll_family != AF_PACKET) |
| 1007 | return -EINVAL; |
| 1008 | |
| 1009 | if (sll->sll_ifindex) { |
| 1010 | err = -ENODEV; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1011 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | if (dev == NULL) |
| 1013 | goto out; |
| 1014 | } |
| 1015 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); |
| 1016 | if (dev) |
| 1017 | dev_put(dev); |
| 1018 | |
| 1019 | out: |
| 1020 | return err; |
| 1021 | } |
| 1022 | |
| 1023 | static struct proto packet_proto = { |
| 1024 | .name = "PACKET", |
| 1025 | .owner = THIS_MODULE, |
| 1026 | .obj_size = sizeof(struct packet_sock), |
| 1027 | }; |
| 1028 | |
| 1029 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1030 | * Create a packet of type SOCK_PACKET. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | */ |
| 1032 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 1033 | static int packet_create(struct net *net, struct socket *sock, int protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | { |
| 1035 | struct sock *sk; |
| 1036 | struct packet_sock *po; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 1037 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | int err; |
| 1039 | |
| 1040 | if (!capable(CAP_NET_RAW)) |
| 1041 | return -EPERM; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 1042 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
| 1043 | sock->type != SOCK_PACKET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | return -ESOCKTNOSUPPORT; |
| 1045 | |
| 1046 | sock->state = SS_UNCONNECTED; |
| 1047 | |
| 1048 | err = -ENOBUFS; |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 1049 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | if (sk == NULL) |
| 1051 | goto out; |
| 1052 | |
| 1053 | sock->ops = &packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | if (sock->type == SOCK_PACKET) |
| 1055 | sock->ops = &packet_ops_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 1056 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | sock_init_data(sock, sk); |
| 1058 | |
| 1059 | po = pkt_sk(sk); |
| 1060 | sk->sk_family = PF_PACKET; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 1061 | po->num = proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | |
| 1063 | sk->sk_destruct = packet_sock_destruct; |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 1064 | sk_refcnt_debug_inc(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
| 1066 | /* |
| 1067 | * Attach a protocol block |
| 1068 | */ |
| 1069 | |
| 1070 | spin_lock_init(&po->bind_lock); |
| 1071 | po->prot_hook.func = packet_rcv; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 1072 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | if (sock->type == SOCK_PACKET) |
| 1074 | po->prot_hook.func = packet_rcv_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 1075 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | po->prot_hook.af_packet_priv = sk; |
| 1077 | |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 1078 | if (proto) { |
| 1079 | po->prot_hook.type = proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | dev_add_pack(&po->prot_hook); |
| 1081 | sock_hold(sk); |
| 1082 | po->running = 1; |
| 1083 | } |
| 1084 | |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 1085 | write_lock_bh(&net->packet.sklist_lock); |
| 1086 | sk_add_node(sk, &net->packet.sklist); |
| 1087 | write_unlock_bh(&net->packet.sklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | return(0); |
| 1089 | out: |
| 1090 | return err; |
| 1091 | } |
| 1092 | |
| 1093 | /* |
| 1094 | * Pull a packet from our receive queue and hand it to the user. |
| 1095 | * If necessary we block. |
| 1096 | */ |
| 1097 | |
| 1098 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1099 | struct msghdr *msg, size_t len, int flags) |
| 1100 | { |
| 1101 | struct sock *sk = sock->sk; |
| 1102 | struct sk_buff *skb; |
| 1103 | int copied, err; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1104 | struct sockaddr_ll *sll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | |
| 1106 | err = -EINVAL; |
| 1107 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) |
| 1108 | goto out; |
| 1109 | |
| 1110 | #if 0 |
| 1111 | /* What error should we return now? EUNATTACH? */ |
| 1112 | if (pkt_sk(sk)->ifindex < 0) |
| 1113 | return -ENODEV; |
| 1114 | #endif |
| 1115 | |
| 1116 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | * Call the generic datagram receiver. This handles all sorts |
| 1118 | * of horrible races and re-entrancy so we can forget about it |
| 1119 | * in the protocol layers. |
| 1120 | * |
| 1121 | * Now it will return ENETDOWN, if device have just gone down, |
| 1122 | * but then it will block. |
| 1123 | */ |
| 1124 | |
| 1125 | skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err); |
| 1126 | |
| 1127 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1128 | * An error occurred so return it. Because skb_recv_datagram() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | * handles the blocking we don't see and worry about blocking |
| 1130 | * retries. |
| 1131 | */ |
| 1132 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 1133 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | goto out; |
| 1135 | |
| 1136 | /* |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1137 | * If the address length field is there to be filled in, we fill |
| 1138 | * it in now. |
| 1139 | */ |
| 1140 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1141 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1142 | if (sock->type == SOCK_PACKET) |
| 1143 | msg->msg_namelen = sizeof(struct sockaddr_pkt); |
| 1144 | else |
| 1145 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); |
| 1146 | |
| 1147 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | * You lose any data beyond the buffer you gave. If it worries a |
| 1149 | * user program they can ask the device for its MTU anyway. |
| 1150 | */ |
| 1151 | |
| 1152 | copied = skb->len; |
| 1153 | if (copied > len) |
| 1154 | { |
| 1155 | copied=len; |
| 1156 | msg->msg_flags|=MSG_TRUNC; |
| 1157 | } |
| 1158 | |
| 1159 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| 1160 | if (err) |
| 1161 | goto out_free; |
| 1162 | |
| 1163 | sock_recv_timestamp(msg, sk, skb); |
| 1164 | |
| 1165 | if (msg->msg_name) |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1166 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
| 1167 | msg->msg_namelen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1169 | if (pkt_sk(sk)->auxdata) { |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1170 | struct tpacket_auxdata aux; |
| 1171 | |
| 1172 | aux.tp_status = TP_STATUS_USER; |
| 1173 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 1174 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; |
| 1175 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; |
| 1176 | aux.tp_snaplen = skb->len; |
| 1177 | aux.tp_mac = 0; |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1178 | aux.tp_net = skb_network_offset(skb); |
Patrick McHardy | 393e52e | 2008-07-14 22:50:39 -0700 | [diff] [blame] | 1179 | aux.tp_vlan_tci = skb->vlan_tci; |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1180 | |
| 1181 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1182 | } |
| 1183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | /* |
| 1185 | * Free or return the buffer as appropriate. Again this |
| 1186 | * hides all the races and re-entrancy issues from us. |
| 1187 | */ |
| 1188 | err = (flags&MSG_TRUNC) ? skb->len : copied; |
| 1189 | |
| 1190 | out_free: |
| 1191 | skb_free_datagram(sk, skb); |
| 1192 | out: |
| 1193 | return err; |
| 1194 | } |
| 1195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
| 1197 | int *uaddr_len, int peer) |
| 1198 | { |
| 1199 | struct net_device *dev; |
| 1200 | struct sock *sk = sock->sk; |
| 1201 | |
| 1202 | if (peer) |
| 1203 | return -EOPNOTSUPP; |
| 1204 | |
| 1205 | uaddr->sa_family = AF_PACKET; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1206 | dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | if (dev) { |
| 1208 | strlcpy(uaddr->sa_data, dev->name, 15); |
| 1209 | dev_put(dev); |
| 1210 | } else |
| 1211 | memset(uaddr->sa_data, 0, 14); |
| 1212 | *uaddr_len = sizeof(*uaddr); |
| 1213 | |
| 1214 | return 0; |
| 1215 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | |
| 1217 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, |
| 1218 | int *uaddr_len, int peer) |
| 1219 | { |
| 1220 | struct net_device *dev; |
| 1221 | struct sock *sk = sock->sk; |
| 1222 | struct packet_sock *po = pkt_sk(sk); |
| 1223 | struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; |
| 1224 | |
| 1225 | if (peer) |
| 1226 | return -EOPNOTSUPP; |
| 1227 | |
| 1228 | sll->sll_family = AF_PACKET; |
| 1229 | sll->sll_ifindex = po->ifindex; |
| 1230 | sll->sll_protocol = po->num; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1231 | dev = dev_get_by_index(sock_net(sk), po->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | if (dev) { |
| 1233 | sll->sll_hatype = dev->type; |
| 1234 | sll->sll_halen = dev->addr_len; |
| 1235 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); |
| 1236 | dev_put(dev); |
| 1237 | } else { |
| 1238 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
| 1239 | sll->sll_halen = 0; |
| 1240 | } |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1241 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | |
| 1243 | return 0; |
| 1244 | } |
| 1245 | |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1246 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
| 1247 | int what) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | { |
| 1249 | switch (i->type) { |
| 1250 | case PACKET_MR_MULTICAST: |
| 1251 | if (what > 0) |
| 1252 | dev_mc_add(dev, i->addr, i->alen, 0); |
| 1253 | else |
| 1254 | dev_mc_delete(dev, i->addr, i->alen, 0); |
| 1255 | break; |
| 1256 | case PACKET_MR_PROMISC: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1257 | return dev_set_promiscuity(dev, what); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | break; |
| 1259 | case PACKET_MR_ALLMULTI: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1260 | return dev_set_allmulti(dev, what); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | break; |
| 1262 | default:; |
| 1263 | } |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1264 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | } |
| 1266 | |
| 1267 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) |
| 1268 | { |
| 1269 | for ( ; i; i=i->next) { |
| 1270 | if (i->ifindex == dev->ifindex) |
| 1271 | packet_dev_mc(dev, i, what); |
| 1272 | } |
| 1273 | } |
| 1274 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1275 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | { |
| 1277 | struct packet_sock *po = pkt_sk(sk); |
| 1278 | struct packet_mclist *ml, *i; |
| 1279 | struct net_device *dev; |
| 1280 | int err; |
| 1281 | |
| 1282 | rtnl_lock(); |
| 1283 | |
| 1284 | err = -ENODEV; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1285 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | if (!dev) |
| 1287 | goto done; |
| 1288 | |
| 1289 | err = -EINVAL; |
| 1290 | if (mreq->mr_alen > dev->addr_len) |
| 1291 | goto done; |
| 1292 | |
| 1293 | err = -ENOBUFS; |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 1294 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | if (i == NULL) |
| 1296 | goto done; |
| 1297 | |
| 1298 | err = 0; |
| 1299 | for (ml = po->mclist; ml; ml = ml->next) { |
| 1300 | if (ml->ifindex == mreq->mr_ifindex && |
| 1301 | ml->type == mreq->mr_type && |
| 1302 | ml->alen == mreq->mr_alen && |
| 1303 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 1304 | ml->count++; |
| 1305 | /* Free the new element ... */ |
| 1306 | kfree(i); |
| 1307 | goto done; |
| 1308 | } |
| 1309 | } |
| 1310 | |
| 1311 | i->type = mreq->mr_type; |
| 1312 | i->ifindex = mreq->mr_ifindex; |
| 1313 | i->alen = mreq->mr_alen; |
| 1314 | memcpy(i->addr, mreq->mr_address, i->alen); |
| 1315 | i->count = 1; |
| 1316 | i->next = po->mclist; |
| 1317 | po->mclist = i; |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 1318 | err = packet_dev_mc(dev, i, 1); |
| 1319 | if (err) { |
| 1320 | po->mclist = i->next; |
| 1321 | kfree(i); |
| 1322 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | |
| 1324 | done: |
| 1325 | rtnl_unlock(); |
| 1326 | return err; |
| 1327 | } |
| 1328 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1329 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | { |
| 1331 | struct packet_mclist *ml, **mlp; |
| 1332 | |
| 1333 | rtnl_lock(); |
| 1334 | |
| 1335 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { |
| 1336 | if (ml->ifindex == mreq->mr_ifindex && |
| 1337 | ml->type == mreq->mr_type && |
| 1338 | ml->alen == mreq->mr_alen && |
| 1339 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 1340 | if (--ml->count == 0) { |
| 1341 | struct net_device *dev; |
| 1342 | *mlp = ml->next; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1343 | dev = dev_get_by_index(sock_net(sk), ml->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | if (dev) { |
| 1345 | packet_dev_mc(dev, ml, -1); |
| 1346 | dev_put(dev); |
| 1347 | } |
| 1348 | kfree(ml); |
| 1349 | } |
| 1350 | rtnl_unlock(); |
| 1351 | return 0; |
| 1352 | } |
| 1353 | } |
| 1354 | rtnl_unlock(); |
| 1355 | return -EADDRNOTAVAIL; |
| 1356 | } |
| 1357 | |
| 1358 | static void packet_flush_mclist(struct sock *sk) |
| 1359 | { |
| 1360 | struct packet_sock *po = pkt_sk(sk); |
| 1361 | struct packet_mclist *ml; |
| 1362 | |
| 1363 | if (!po->mclist) |
| 1364 | return; |
| 1365 | |
| 1366 | rtnl_lock(); |
| 1367 | while ((ml = po->mclist) != NULL) { |
| 1368 | struct net_device *dev; |
| 1369 | |
| 1370 | po->mclist = ml->next; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1371 | if ((dev = dev_get_by_index(sock_net(sk), ml->ifindex)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | packet_dev_mc(dev, ml, -1); |
| 1373 | dev_put(dev); |
| 1374 | } |
| 1375 | kfree(ml); |
| 1376 | } |
| 1377 | rtnl_unlock(); |
| 1378 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | |
| 1380 | static int |
| 1381 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) |
| 1382 | { |
| 1383 | struct sock *sk = sock->sk; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1384 | struct packet_sock *po = pkt_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | int ret; |
| 1386 | |
| 1387 | if (level != SOL_PACKET) |
| 1388 | return -ENOPROTOOPT; |
| 1389 | |
| 1390 | switch(optname) { |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1391 | case PACKET_ADD_MEMBERSHIP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | case PACKET_DROP_MEMBERSHIP: |
| 1393 | { |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1394 | struct packet_mreq_max mreq; |
| 1395 | int len = optlen; |
| 1396 | memset(&mreq, 0, sizeof(mreq)); |
| 1397 | if (len < sizeof(struct packet_mreq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | return -EINVAL; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1399 | if (len > sizeof(mreq)) |
| 1400 | len = sizeof(mreq); |
| 1401 | if (copy_from_user(&mreq,optval,len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | return -EFAULT; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 1403 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
| 1404 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | if (optname == PACKET_ADD_MEMBERSHIP) |
| 1406 | ret = packet_mc_add(sk, &mreq); |
| 1407 | else |
| 1408 | ret = packet_mc_drop(sk, &mreq); |
| 1409 | return ret; |
| 1410 | } |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 1411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | #ifdef CONFIG_PACKET_MMAP |
| 1413 | case PACKET_RX_RING: |
| 1414 | { |
| 1415 | struct tpacket_req req; |
| 1416 | |
| 1417 | if (optlen<sizeof(req)) |
| 1418 | return -EINVAL; |
| 1419 | if (copy_from_user(&req,optval,sizeof(req))) |
| 1420 | return -EFAULT; |
| 1421 | return packet_set_ring(sk, &req, 0); |
| 1422 | } |
| 1423 | case PACKET_COPY_THRESH: |
| 1424 | { |
| 1425 | int val; |
| 1426 | |
| 1427 | if (optlen!=sizeof(val)) |
| 1428 | return -EINVAL; |
| 1429 | if (copy_from_user(&val,optval,sizeof(val))) |
| 1430 | return -EFAULT; |
| 1431 | |
| 1432 | pkt_sk(sk)->copy_thresh = val; |
| 1433 | return 0; |
| 1434 | } |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1435 | case PACKET_VERSION: |
| 1436 | { |
| 1437 | int val; |
| 1438 | |
| 1439 | if (optlen != sizeof(val)) |
| 1440 | return -EINVAL; |
| 1441 | if (po->pg_vec) |
| 1442 | return -EBUSY; |
| 1443 | if (copy_from_user(&val, optval, sizeof(val))) |
| 1444 | return -EFAULT; |
| 1445 | switch (val) { |
| 1446 | case TPACKET_V1: |
| 1447 | case TPACKET_V2: |
| 1448 | po->tp_version = val; |
| 1449 | return 0; |
| 1450 | default: |
| 1451 | return -EINVAL; |
| 1452 | } |
| 1453 | } |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1454 | case PACKET_RESERVE: |
| 1455 | { |
| 1456 | unsigned int val; |
| 1457 | |
| 1458 | if (optlen != sizeof(val)) |
| 1459 | return -EINVAL; |
| 1460 | if (po->pg_vec) |
| 1461 | return -EBUSY; |
| 1462 | if (copy_from_user(&val, optval, sizeof(val))) |
| 1463 | return -EFAULT; |
| 1464 | po->tp_reserve = val; |
| 1465 | return 0; |
| 1466 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | #endif |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1468 | case PACKET_AUXDATA: |
| 1469 | { |
| 1470 | int val; |
| 1471 | |
| 1472 | if (optlen < sizeof(val)) |
| 1473 | return -EINVAL; |
| 1474 | if (copy_from_user(&val, optval, sizeof(val))) |
| 1475 | return -EFAULT; |
| 1476 | |
| 1477 | po->auxdata = !!val; |
| 1478 | return 0; |
| 1479 | } |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 1480 | case PACKET_ORIGDEV: |
| 1481 | { |
| 1482 | int val; |
| 1483 | |
| 1484 | if (optlen < sizeof(val)) |
| 1485 | return -EINVAL; |
| 1486 | if (copy_from_user(&val, optval, sizeof(val))) |
| 1487 | return -EFAULT; |
| 1488 | |
| 1489 | po->origdev = !!val; |
| 1490 | return 0; |
| 1491 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | default: |
| 1493 | return -ENOPROTOOPT; |
| 1494 | } |
| 1495 | } |
| 1496 | |
| 1497 | static int packet_getsockopt(struct socket *sock, int level, int optname, |
| 1498 | char __user *optval, int __user *optlen) |
| 1499 | { |
| 1500 | int len; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1501 | int val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | struct sock *sk = sock->sk; |
| 1503 | struct packet_sock *po = pkt_sk(sk); |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1504 | void *data; |
| 1505 | struct tpacket_stats st; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | |
| 1507 | if (level != SOL_PACKET) |
| 1508 | return -ENOPROTOOPT; |
| 1509 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 1510 | if (get_user(len, optlen)) |
| 1511 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | |
| 1513 | if (len < 0) |
| 1514 | return -EINVAL; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | switch(optname) { |
| 1517 | case PACKET_STATISTICS: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | if (len > sizeof(struct tpacket_stats)) |
| 1519 | len = sizeof(struct tpacket_stats); |
| 1520 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1521 | st = po->stats; |
| 1522 | memset(&po->stats, 0, sizeof(st)); |
| 1523 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1524 | st.tp_packets += st.tp_drops; |
| 1525 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1526 | data = &st; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | break; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1528 | case PACKET_AUXDATA: |
| 1529 | if (len > sizeof(int)) |
| 1530 | len = sizeof(int); |
| 1531 | val = po->auxdata; |
| 1532 | |
| 1533 | data = &val; |
| 1534 | break; |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 1535 | case PACKET_ORIGDEV: |
| 1536 | if (len > sizeof(int)) |
| 1537 | len = sizeof(int); |
| 1538 | val = po->origdev; |
| 1539 | |
| 1540 | data = &val; |
| 1541 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1542 | #ifdef CONFIG_PACKET_MMAP |
| 1543 | case PACKET_VERSION: |
| 1544 | if (len > sizeof(int)) |
| 1545 | len = sizeof(int); |
| 1546 | val = po->tp_version; |
| 1547 | data = &val; |
| 1548 | break; |
| 1549 | case PACKET_HDRLEN: |
| 1550 | if (len > sizeof(int)) |
| 1551 | len = sizeof(int); |
| 1552 | if (copy_from_user(&val, optval, len)) |
| 1553 | return -EFAULT; |
| 1554 | switch (val) { |
| 1555 | case TPACKET_V1: |
| 1556 | val = sizeof(struct tpacket_hdr); |
| 1557 | break; |
| 1558 | case TPACKET_V2: |
| 1559 | val = sizeof(struct tpacket2_hdr); |
| 1560 | break; |
| 1561 | default: |
| 1562 | return -EINVAL; |
| 1563 | } |
| 1564 | data = &val; |
| 1565 | break; |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1566 | case PACKET_RESERVE: |
| 1567 | if (len > sizeof(unsigned int)) |
| 1568 | len = sizeof(unsigned int); |
| 1569 | val = po->tp_reserve; |
| 1570 | data = &val; |
| 1571 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1572 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | default: |
| 1574 | return -ENOPROTOOPT; |
| 1575 | } |
| 1576 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 1577 | if (put_user(len, optlen)) |
| 1578 | return -EFAULT; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1579 | if (copy_to_user(optval, data, len)) |
| 1580 | return -EFAULT; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 1581 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | } |
| 1583 | |
| 1584 | |
| 1585 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) |
| 1586 | { |
| 1587 | struct sock *sk; |
| 1588 | struct hlist_node *node; |
Jason Lunz | ad93065 | 2007-02-20 23:19:54 -0800 | [diff] [blame] | 1589 | struct net_device *dev = data; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1590 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 1592 | read_lock(&net->packet.sklist_lock); |
| 1593 | sk_for_each(sk, node, &net->packet.sklist) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | struct packet_sock *po = pkt_sk(sk); |
| 1595 | |
| 1596 | switch (msg) { |
| 1597 | case NETDEV_UNREGISTER: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | if (po->mclist) |
| 1599 | packet_dev_mclist(dev, po->mclist, -1); |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 1600 | /* fallthrough */ |
| 1601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | case NETDEV_DOWN: |
| 1603 | if (dev->ifindex == po->ifindex) { |
| 1604 | spin_lock(&po->bind_lock); |
| 1605 | if (po->running) { |
| 1606 | __dev_remove_pack(&po->prot_hook); |
| 1607 | __sock_put(sk); |
| 1608 | po->running = 0; |
| 1609 | sk->sk_err = ENETDOWN; |
| 1610 | if (!sock_flag(sk, SOCK_DEAD)) |
| 1611 | sk->sk_error_report(sk); |
| 1612 | } |
| 1613 | if (msg == NETDEV_UNREGISTER) { |
| 1614 | po->ifindex = -1; |
| 1615 | po->prot_hook.dev = NULL; |
| 1616 | } |
| 1617 | spin_unlock(&po->bind_lock); |
| 1618 | } |
| 1619 | break; |
| 1620 | case NETDEV_UP: |
| 1621 | spin_lock(&po->bind_lock); |
| 1622 | if (dev->ifindex == po->ifindex && po->num && |
| 1623 | !po->running) { |
| 1624 | dev_add_pack(&po->prot_hook); |
| 1625 | sock_hold(sk); |
| 1626 | po->running = 1; |
| 1627 | } |
| 1628 | spin_unlock(&po->bind_lock); |
| 1629 | break; |
| 1630 | } |
| 1631 | } |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 1632 | read_unlock(&net->packet.sklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | return NOTIFY_DONE; |
| 1634 | } |
| 1635 | |
| 1636 | |
| 1637 | static int packet_ioctl(struct socket *sock, unsigned int cmd, |
| 1638 | unsigned long arg) |
| 1639 | { |
| 1640 | struct sock *sk = sock->sk; |
| 1641 | |
| 1642 | switch(cmd) { |
| 1643 | case SIOCOUTQ: |
| 1644 | { |
| 1645 | int amount = atomic_read(&sk->sk_wmem_alloc); |
| 1646 | return put_user(amount, (int __user *)arg); |
| 1647 | } |
| 1648 | case SIOCINQ: |
| 1649 | { |
| 1650 | struct sk_buff *skb; |
| 1651 | int amount = 0; |
| 1652 | |
| 1653 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1654 | skb = skb_peek(&sk->sk_receive_queue); |
| 1655 | if (skb) |
| 1656 | amount = skb->len; |
| 1657 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1658 | return put_user(amount, (int __user *)arg); |
| 1659 | } |
| 1660 | case SIOCGSTAMP: |
| 1661 | return sock_get_timestamp(sk, (struct timeval __user *)arg); |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 1662 | case SIOCGSTAMPNS: |
| 1663 | return sock_get_timestampns(sk, (struct timespec __user *)arg); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | #ifdef CONFIG_INET |
| 1666 | case SIOCADDRT: |
| 1667 | case SIOCDELRT: |
| 1668 | case SIOCDARP: |
| 1669 | case SIOCGARP: |
| 1670 | case SIOCSARP: |
| 1671 | case SIOCGIFADDR: |
| 1672 | case SIOCSIFADDR: |
| 1673 | case SIOCGIFBRDADDR: |
| 1674 | case SIOCSIFBRDADDR: |
| 1675 | case SIOCGIFNETMASK: |
| 1676 | case SIOCSIFNETMASK: |
| 1677 | case SIOCGIFDSTADDR: |
| 1678 | case SIOCSIFDSTADDR: |
| 1679 | case SIOCSIFFLAGS: |
YOSHIFUJI Hideaki | 721499e | 2008-07-19 22:34:43 -0700 | [diff] [blame] | 1680 | if (!net_eq(sock_net(sk), &init_net)) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 1681 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
| 1683 | #endif |
| 1684 | |
| 1685 | default: |
Christoph Hellwig | b5e5fa5 | 2006-01-03 14:18:33 -0800 | [diff] [blame] | 1686 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | } |
| 1688 | return 0; |
| 1689 | } |
| 1690 | |
| 1691 | #ifndef CONFIG_PACKET_MMAP |
| 1692 | #define packet_mmap sock_no_mmap |
| 1693 | #define packet_poll datagram_poll |
| 1694 | #else |
| 1695 | |
| 1696 | static unsigned int packet_poll(struct file * file, struct socket *sock, |
| 1697 | poll_table *wait) |
| 1698 | { |
| 1699 | struct sock *sk = sock->sk; |
| 1700 | struct packet_sock *po = pkt_sk(sk); |
| 1701 | unsigned int mask = datagram_poll(file, sock, wait); |
| 1702 | |
| 1703 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1704 | if (po->pg_vec) { |
| 1705 | unsigned last = po->head ? po->head-1 : po->frame_max; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1707 | if (packet_lookup_frame(po, last, TP_STATUS_USER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | mask |= POLLIN | POLLRDNORM; |
| 1709 | } |
| 1710 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1711 | return mask; |
| 1712 | } |
| 1713 | |
| 1714 | |
| 1715 | /* Dirty? Well, I still did not learn better way to account |
| 1716 | * for user mmaps. |
| 1717 | */ |
| 1718 | |
| 1719 | static void packet_mm_open(struct vm_area_struct *vma) |
| 1720 | { |
| 1721 | struct file *file = vma->vm_file; |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 1722 | struct socket * sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1724 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | if (sk) |
| 1726 | atomic_inc(&pkt_sk(sk)->mapped); |
| 1727 | } |
| 1728 | |
| 1729 | static void packet_mm_close(struct vm_area_struct *vma) |
| 1730 | { |
| 1731 | struct file *file = vma->vm_file; |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 1732 | struct socket * sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | if (sk) |
| 1736 | atomic_dec(&pkt_sk(sk)->mapped); |
| 1737 | } |
| 1738 | |
| 1739 | static struct vm_operations_struct packet_mmap_ops = { |
| 1740 | .open = packet_mm_open, |
| 1741 | .close =packet_mm_close, |
| 1742 | }; |
| 1743 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1744 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | { |
| 1746 | int i; |
| 1747 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1748 | for (i = 0; i < len; i++) { |
| 1749 | if (likely(pg_vec[i])) |
| 1750 | free_pages((unsigned long) pg_vec[i], order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | } |
| 1752 | kfree(pg_vec); |
| 1753 | } |
| 1754 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1755 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
| 1756 | { |
| 1757 | return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO, |
| 1758 | order); |
| 1759 | } |
| 1760 | |
| 1761 | static char **alloc_pg_vec(struct tpacket_req *req, int order) |
| 1762 | { |
| 1763 | unsigned int block_nr = req->tp_block_nr; |
| 1764 | char **pg_vec; |
| 1765 | int i; |
| 1766 | |
| 1767 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); |
| 1768 | if (unlikely(!pg_vec)) |
| 1769 | goto out; |
| 1770 | |
| 1771 | for (i = 0; i < block_nr; i++) { |
| 1772 | pg_vec[i] = alloc_one_pg_vec_page(order); |
| 1773 | if (unlikely(!pg_vec[i])) |
| 1774 | goto out_free_pgvec; |
| 1775 | } |
| 1776 | |
| 1777 | out: |
| 1778 | return pg_vec; |
| 1779 | |
| 1780 | out_free_pgvec: |
| 1781 | free_pg_vec(pg_vec, order, block_nr); |
| 1782 | pg_vec = NULL; |
| 1783 | goto out; |
| 1784 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | |
| 1786 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) |
| 1787 | { |
| 1788 | char **pg_vec = NULL; |
| 1789 | struct packet_sock *po = pkt_sk(sk); |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 1790 | int was_running, order = 0; |
| 1791 | __be16 num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | int err = 0; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | if (req->tp_block_nr) { |
Jiri Olsa | 2a706ec | 2008-03-23 22:42:34 -0700 | [diff] [blame] | 1795 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | |
| 1797 | /* Sanity tests and some calculations */ |
| 1798 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1799 | if (unlikely(po->pg_vec)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | return -EBUSY; |
| 1801 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1802 | switch (po->tp_version) { |
| 1803 | case TPACKET_V1: |
| 1804 | po->tp_hdrlen = TPACKET_HDRLEN; |
| 1805 | break; |
| 1806 | case TPACKET_V2: |
| 1807 | po->tp_hdrlen = TPACKET2_HDRLEN; |
| 1808 | break; |
| 1809 | } |
| 1810 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1811 | if (unlikely((int)req->tp_block_size <= 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | return -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1813 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | return -EINVAL; |
Patrick McHardy | 8913336 | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1815 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
| 1816 | po->tp_reserve)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | return -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1818 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | return -EINVAL; |
| 1820 | |
| 1821 | po->frames_per_block = req->tp_block_size/req->tp_frame_size; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1822 | if (unlikely(po->frames_per_block <= 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | return -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1824 | if (unlikely((po->frames_per_block * req->tp_block_nr) != |
| 1825 | req->tp_frame_nr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | |
| 1828 | err = -ENOMEM; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1829 | order = get_order(req->tp_block_size); |
| 1830 | pg_vec = alloc_pg_vec(req, order); |
| 1831 | if (unlikely(!pg_vec)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1834 | for (i = 0; i < req->tp_block_nr; i++) { |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1835 | void *ptr = pg_vec[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | int k; |
| 1837 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1838 | for (k = 0; k < po->frames_per_block; k++) { |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1839 | __packet_set_status(po, ptr, TP_STATUS_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | ptr += req->tp_frame_size; |
| 1841 | } |
| 1842 | } |
| 1843 | /* Done */ |
| 1844 | } else { |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1845 | if (unlikely(req->tp_frame_nr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1846 | return -EINVAL; |
| 1847 | } |
| 1848 | |
| 1849 | lock_sock(sk); |
| 1850 | |
| 1851 | /* Detach socket from network */ |
| 1852 | spin_lock(&po->bind_lock); |
| 1853 | was_running = po->running; |
| 1854 | num = po->num; |
| 1855 | if (was_running) { |
| 1856 | __dev_remove_pack(&po->prot_hook); |
| 1857 | po->num = 0; |
| 1858 | po->running = 0; |
| 1859 | __sock_put(sk); |
| 1860 | } |
| 1861 | spin_unlock(&po->bind_lock); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1862 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | synchronize_net(); |
| 1864 | |
| 1865 | err = -EBUSY; |
| 1866 | if (closing || atomic_read(&po->mapped) == 0) { |
| 1867 | err = 0; |
| 1868 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) |
| 1869 | |
| 1870 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1871 | pg_vec = XC(po->pg_vec, pg_vec); |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1872 | po->frame_max = (req->tp_frame_nr - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | po->head = 0; |
| 1874 | po->frame_size = req->tp_frame_size; |
| 1875 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1876 | |
| 1877 | order = XC(po->pg_vec_order, order); |
| 1878 | req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); |
| 1879 | |
| 1880 | po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; |
| 1881 | po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; |
| 1882 | skb_queue_purge(&sk->sk_receive_queue); |
| 1883 | #undef XC |
| 1884 | if (atomic_read(&po->mapped)) |
| 1885 | printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); |
| 1886 | } |
| 1887 | |
| 1888 | spin_lock(&po->bind_lock); |
| 1889 | if (was_running && !po->running) { |
| 1890 | sock_hold(sk); |
| 1891 | po->running = 1; |
| 1892 | po->num = num; |
| 1893 | dev_add_pack(&po->prot_hook); |
| 1894 | } |
| 1895 | spin_unlock(&po->bind_lock); |
| 1896 | |
| 1897 | release_sock(sk); |
| 1898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | if (pg_vec) |
| 1900 | free_pg_vec(pg_vec, order, req->tp_block_nr); |
| 1901 | out: |
| 1902 | return err; |
| 1903 | } |
| 1904 | |
| 1905 | static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
| 1906 | { |
| 1907 | struct sock *sk = sock->sk; |
| 1908 | struct packet_sock *po = pkt_sk(sk); |
| 1909 | unsigned long size; |
| 1910 | unsigned long start; |
| 1911 | int err = -EINVAL; |
| 1912 | int i; |
| 1913 | |
| 1914 | if (vma->vm_pgoff) |
| 1915 | return -EINVAL; |
| 1916 | |
| 1917 | size = vma->vm_end - vma->vm_start; |
| 1918 | |
| 1919 | lock_sock(sk); |
| 1920 | if (po->pg_vec == NULL) |
| 1921 | goto out; |
| 1922 | if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) |
| 1923 | goto out; |
| 1924 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | start = vma->vm_start; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1926 | for (i = 0; i < po->pg_vec_len; i++) { |
| 1927 | struct page *page = virt_to_page(po->pg_vec[i]); |
| 1928 | int pg_num; |
| 1929 | |
| 1930 | for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) { |
| 1931 | err = vm_insert_page(vma, start, page); |
| 1932 | if (unlikely(err)) |
| 1933 | goto out; |
| 1934 | start += PAGE_SIZE; |
| 1935 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | } |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 1937 | atomic_inc(&po->mapped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | vma->vm_ops = &packet_mmap_ops; |
| 1939 | err = 0; |
| 1940 | |
| 1941 | out: |
| 1942 | release_sock(sk); |
| 1943 | return err; |
| 1944 | } |
| 1945 | #endif |
| 1946 | |
| 1947 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1948 | static const struct proto_ops packet_ops_spkt = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | .family = PF_PACKET, |
| 1950 | .owner = THIS_MODULE, |
| 1951 | .release = packet_release, |
| 1952 | .bind = packet_bind_spkt, |
| 1953 | .connect = sock_no_connect, |
| 1954 | .socketpair = sock_no_socketpair, |
| 1955 | .accept = sock_no_accept, |
| 1956 | .getname = packet_getname_spkt, |
| 1957 | .poll = datagram_poll, |
| 1958 | .ioctl = packet_ioctl, |
| 1959 | .listen = sock_no_listen, |
| 1960 | .shutdown = sock_no_shutdown, |
| 1961 | .setsockopt = sock_no_setsockopt, |
| 1962 | .getsockopt = sock_no_getsockopt, |
| 1963 | .sendmsg = packet_sendmsg_spkt, |
| 1964 | .recvmsg = packet_recvmsg, |
| 1965 | .mmap = sock_no_mmap, |
| 1966 | .sendpage = sock_no_sendpage, |
| 1967 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1969 | static const struct proto_ops packet_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | .family = PF_PACKET, |
| 1971 | .owner = THIS_MODULE, |
| 1972 | .release = packet_release, |
| 1973 | .bind = packet_bind, |
| 1974 | .connect = sock_no_connect, |
| 1975 | .socketpair = sock_no_socketpair, |
| 1976 | .accept = sock_no_accept, |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1977 | .getname = packet_getname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | .poll = packet_poll, |
| 1979 | .ioctl = packet_ioctl, |
| 1980 | .listen = sock_no_listen, |
| 1981 | .shutdown = sock_no_shutdown, |
| 1982 | .setsockopt = packet_setsockopt, |
| 1983 | .getsockopt = packet_getsockopt, |
| 1984 | .sendmsg = packet_sendmsg, |
| 1985 | .recvmsg = packet_recvmsg, |
| 1986 | .mmap = packet_mmap, |
| 1987 | .sendpage = sock_no_sendpage, |
| 1988 | }; |
| 1989 | |
| 1990 | static struct net_proto_family packet_family_ops = { |
| 1991 | .family = PF_PACKET, |
| 1992 | .create = packet_create, |
| 1993 | .owner = THIS_MODULE, |
| 1994 | }; |
| 1995 | |
| 1996 | static struct notifier_block packet_netdev_notifier = { |
| 1997 | .notifier_call =packet_notifier, |
| 1998 | }; |
| 1999 | |
| 2000 | #ifdef CONFIG_PROC_FS |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2001 | static inline struct sock *packet_seq_idx(struct net *net, loff_t off) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | { |
| 2003 | struct sock *s; |
| 2004 | struct hlist_node *node; |
| 2005 | |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2006 | sk_for_each(s, node, &net->packet.sklist) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | if (!off--) |
| 2008 | return s; |
| 2009 | } |
| 2010 | return NULL; |
| 2011 | } |
| 2012 | |
| 2013 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | 40ccbf5 | 2008-01-07 22:39:57 -0800 | [diff] [blame] | 2014 | __acquires(seq_file_net(seq)->packet.sklist_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2016 | struct net *net = seq_file_net(seq); |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2017 | read_lock(&net->packet.sklist_lock); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2018 | return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | } |
| 2020 | |
| 2021 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2022 | { |
Herbert Xu | 1bf4095 | 2007-12-16 14:04:02 -0800 | [diff] [blame] | 2023 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | ++*pos; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2025 | return (v == SEQ_START_TOKEN) |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2026 | ? sk_head(&net->packet.sklist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | : sk_next((struct sock*)v) ; |
| 2028 | } |
| 2029 | |
| 2030 | static void packet_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | 40ccbf5 | 2008-01-07 22:39:57 -0800 | [diff] [blame] | 2031 | __releases(seq_file_net(seq)->packet.sklist_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | { |
Herbert Xu | 1bf4095 | 2007-12-16 14:04:02 -0800 | [diff] [blame] | 2033 | struct net *net = seq_file_net(seq); |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2034 | read_unlock(&net->packet.sklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | } |
| 2036 | |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2037 | static int packet_seq_show(struct seq_file *seq, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | { |
| 2039 | if (v == SEQ_START_TOKEN) |
| 2040 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); |
| 2041 | else { |
| 2042 | struct sock *s = v; |
| 2043 | const struct packet_sock *po = pkt_sk(s); |
| 2044 | |
| 2045 | seq_printf(seq, |
| 2046 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
| 2047 | s, |
| 2048 | atomic_read(&s->sk_refcnt), |
| 2049 | s->sk_type, |
| 2050 | ntohs(po->num), |
| 2051 | po->ifindex, |
| 2052 | po->running, |
| 2053 | atomic_read(&s->sk_rmem_alloc), |
| 2054 | sock_i_uid(s), |
| 2055 | sock_i_ino(s) ); |
| 2056 | } |
| 2057 | |
| 2058 | return 0; |
| 2059 | } |
| 2060 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 2061 | static const struct seq_operations packet_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | .start = packet_seq_start, |
| 2063 | .next = packet_seq_next, |
| 2064 | .stop = packet_seq_stop, |
| 2065 | .show = packet_seq_show, |
| 2066 | }; |
| 2067 | |
| 2068 | static int packet_seq_open(struct inode *inode, struct file *file) |
| 2069 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2070 | return seq_open_net(inode, file, &packet_seq_ops, |
| 2071 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | } |
| 2073 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 2074 | static const struct file_operations packet_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | .owner = THIS_MODULE, |
| 2076 | .open = packet_seq_open, |
| 2077 | .read = seq_read, |
| 2078 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2079 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | }; |
| 2081 | |
| 2082 | #endif |
| 2083 | |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2084 | static int packet_net_init(struct net *net) |
| 2085 | { |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 2086 | rwlock_init(&net->packet.sklist_lock); |
| 2087 | INIT_HLIST_HEAD(&net->packet.sklist); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2088 | |
| 2089 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) |
| 2090 | return -ENOMEM; |
| 2091 | |
| 2092 | return 0; |
| 2093 | } |
| 2094 | |
| 2095 | static void packet_net_exit(struct net *net) |
| 2096 | { |
| 2097 | proc_net_remove(net, "packet"); |
| 2098 | } |
| 2099 | |
| 2100 | static struct pernet_operations packet_net_ops = { |
| 2101 | .init = packet_net_init, |
| 2102 | .exit = packet_net_exit, |
| 2103 | }; |
| 2104 | |
| 2105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | static void __exit packet_exit(void) |
| 2107 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | unregister_netdevice_notifier(&packet_netdev_notifier); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2109 | unregister_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | sock_unregister(PF_PACKET); |
| 2111 | proto_unregister(&packet_proto); |
| 2112 | } |
| 2113 | |
| 2114 | static int __init packet_init(void) |
| 2115 | { |
| 2116 | int rc = proto_register(&packet_proto, 0); |
| 2117 | |
| 2118 | if (rc != 0) |
| 2119 | goto out; |
| 2120 | |
| 2121 | sock_register(&packet_family_ops); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2122 | register_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | register_netdevice_notifier(&packet_netdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | out: |
| 2125 | return rc; |
| 2126 | } |
| 2127 | |
| 2128 | module_init(packet_init); |
| 2129 | module_exit(packet_exit); |
| 2130 | MODULE_LICENSE("GPL"); |
| 2131 | MODULE_ALIAS_NETPROTO(PF_PACKET); |