| 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 | * Generic socket support routines. Memory allocators, socket lock/release |
| 7 | * handler for protocols to use and generic option handler. |
| 8 | * |
| 9 | * |
| 10 | * Authors: Ross Biro |
| 11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * Florian La Roche, <flla@stud.uni-sb.de> |
| 13 | * Alan Cox, <A.Cox@swansea.ac.uk> |
| 14 | * |
| 15 | * Fixes: |
| 16 | * Alan Cox : Numerous verify_area() problems |
| 17 | * Alan Cox : Connecting on a connecting socket |
| 18 | * now returns an error for tcp. |
| 19 | * Alan Cox : sock->protocol is set correctly. |
| 20 | * and is not sometimes left as 0. |
| 21 | * Alan Cox : connect handles icmp errors on a |
| 22 | * connect properly. Unfortunately there |
| 23 | * is a restart syscall nasty there. I |
| 24 | * can't match BSD without hacking the C |
| 25 | * library. Ideas urgently sought! |
| 26 | * Alan Cox : Disallow bind() to addresses that are |
| 27 | * not ours - especially broadcast ones!! |
| 28 | * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) |
| 29 | * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, |
| 30 | * instead they leave that for the DESTROY timer. |
| 31 | * Alan Cox : Clean up error flag in accept |
| 32 | * Alan Cox : TCP ack handling is buggy, the DESTROY timer |
| 33 | * was buggy. Put a remove_sock() in the handler |
| 34 | * for memory when we hit 0. Also altered the timer |
| 35 | * code. The ACK stuff can wait and needs major |
| 36 | * TCP layer surgery. |
| 37 | * Alan Cox : Fixed TCP ack bug, removed remove sock |
| 38 | * and fixed timer/inet_bh race. |
| 39 | * Alan Cox : Added zapped flag for TCP |
| 40 | * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code |
| 41 | * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb |
| 42 | * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources |
| 43 | * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. |
| 44 | * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... |
| 45 | * Rick Sladkey : Relaxed UDP rules for matching packets. |
| 46 | * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support |
| 47 | * Pauline Middelink : identd support |
| 48 | * Alan Cox : Fixed connect() taking signals I think. |
| 49 | * Alan Cox : SO_LINGER supported |
| 50 | * Alan Cox : Error reporting fixes |
| 51 | * Anonymous : inet_create tidied up (sk->reuse setting) |
| 52 | * Alan Cox : inet sockets don't set sk->type! |
| 53 | * Alan Cox : Split socket option code |
| 54 | * Alan Cox : Callbacks |
| 55 | * Alan Cox : Nagle flag for Charles & Johannes stuff |
| 56 | * Alex : Removed restriction on inet fioctl |
| 57 | * Alan Cox : Splitting INET from NET core |
| 58 | * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() |
| 59 | * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code |
| 60 | * Alan Cox : Split IP from generic code |
| 61 | * Alan Cox : New kfree_skbmem() |
| 62 | * Alan Cox : Make SO_DEBUG superuser only. |
| 63 | * Alan Cox : Allow anyone to clear SO_DEBUG |
| 64 | * (compatibility fix) |
| 65 | * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. |
| 66 | * Alan Cox : Allocator for a socket is settable. |
| 67 | * Alan Cox : SO_ERROR includes soft errors. |
| 68 | * Alan Cox : Allow NULL arguments on some SO_ opts |
| 69 | * Alan Cox : Generic socket allocation to make hooks |
| 70 | * easier (suggested by Craig Metz). |
| 71 | * Michael Pall : SO_ERROR returns positive errno again |
| 72 | * Steve Whitehouse: Added default destructor to free |
| 73 | * protocol private data. |
| 74 | * Steve Whitehouse: Added various other default routines |
| 75 | * common to several socket families. |
| 76 | * Chris Evans : Call suser() check last on F_SETOWN |
| 77 | * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. |
| 78 | * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() |
| 79 | * Andi Kleen : Fix write_space callback |
| 80 | * Chris Evans : Security fixes - signedness again |
| 81 | * Arnaldo C. Melo : cleanups, use skb_queue_purge |
| 82 | * |
| 83 | * To Fix: |
| 84 | * |
| 85 | * |
| 86 | * This program is free software; you can redistribute it and/or |
| 87 | * modify it under the terms of the GNU General Public License |
| 88 | * as published by the Free Software Foundation; either version |
| 89 | * 2 of the License, or (at your option) any later version. |
| 90 | */ |
| 91 | |
| 92 | #include <linux/capability.h> |
| 93 | #include <linux/errno.h> |
| 94 | #include <linux/types.h> |
| 95 | #include <linux/socket.h> |
| 96 | #include <linux/in.h> |
| 97 | #include <linux/kernel.h> |
| 98 | #include <linux/module.h> |
| 99 | #include <linux/proc_fs.h> |
| 100 | #include <linux/seq_file.h> |
| 101 | #include <linux/sched.h> |
| 102 | #include <linux/timer.h> |
| 103 | #include <linux/string.h> |
| 104 | #include <linux/sockios.h> |
| 105 | #include <linux/net.h> |
| 106 | #include <linux/mm.h> |
| 107 | #include <linux/slab.h> |
| 108 | #include <linux/interrupt.h> |
| 109 | #include <linux/poll.h> |
| 110 | #include <linux/tcp.h> |
| 111 | #include <linux/init.h> |
| 112 | #include <linux/highmem.h> |
| 113 | |
| 114 | #include <asm/uaccess.h> |
| 115 | #include <asm/system.h> |
| 116 | |
| 117 | #include <linux/netdevice.h> |
| 118 | #include <net/protocol.h> |
| 119 | #include <linux/skbuff.h> |
| 120 | #include <net/net_namespace.h> |
| 121 | #include <net/request_sock.h> |
| 122 | #include <net/sock.h> |
| 123 | #include <linux/net_tstamp.h> |
| 124 | #include <net/xfrm.h> |
| 125 | #include <linux/ipsec.h> |
| 126 | |
| 127 | #include <linux/filter.h> |
| 128 | |
| 129 | #ifdef CONFIG_INET |
| 130 | #include <net/tcp.h> |
| 131 | #endif |
| 132 | |
| 133 | /* |
| 134 | * Each address family might have different locking rules, so we have |
| 135 | * one slock key per address family: |
| 136 | */ |
| 137 | static struct lock_class_key af_family_keys[AF_MAX]; |
| 138 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
| 139 | |
| 140 | /* |
| 141 | * Make lock validator output more readable. (we pre-construct these |
| 142 | * strings build-time, so that runtime initialization of socket |
| 143 | * locks is fast): |
| 144 | */ |
| 145 | static const char *af_family_key_strings[AF_MAX+1] = { |
| 146 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
| 147 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", |
| 148 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , |
| 149 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , |
| 150 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , |
| 151 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , |
| 152 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , |
| 153 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
| 154 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
| 155 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
| 156 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
| 157 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
| 158 | "sk_lock-AF_IEEE802154", |
| 159 | "sk_lock-AF_MAX" |
| 160 | }; |
| 161 | static const char *af_family_slock_key_strings[AF_MAX+1] = { |
| 162 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
| 163 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", |
| 164 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , |
| 165 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , |
| 166 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , |
| 167 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , |
| 168 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , |
| 169 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
| 170 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
| 171 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
| 172 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
| 173 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
| 174 | "slock-AF_IEEE802154", |
| 175 | "slock-AF_MAX" |
| 176 | }; |
| 177 | static const char *af_family_clock_key_strings[AF_MAX+1] = { |
| 178 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
| 179 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", |
| 180 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , |
| 181 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , |
| 182 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , |
| 183 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , |
| 184 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , |
| 185 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
| 186 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
| 187 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
| 188 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
| 189 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
| 190 | "clock-AF_IEEE802154", |
| 191 | "clock-AF_MAX" |
| 192 | }; |
| 193 | |
| 194 | /* |
| 195 | * sk_callback_lock locking rules are per-address-family, |
| 196 | * so split the lock classes by using a per-AF key: |
| 197 | */ |
| 198 | static struct lock_class_key af_callback_keys[AF_MAX]; |
| 199 | |
| 200 | /* Take into consideration the size of the struct sk_buff overhead in the |
| 201 | * determination of these values, since that is non-constant across |
| 202 | * platforms. This makes socket queueing behavior and performance |
| 203 | * not depend upon such differences. |
| 204 | */ |
| 205 | #define _SK_MEM_PACKETS 256 |
| 206 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) |
| 207 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 208 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 209 | |
| 210 | /* Run time adjustable parameters. */ |
| 211 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
| 212 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
| 213 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
| 214 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; |
| 215 | |
| 216 | /* Maximal space eaten by iovec or ancilliary data plus some space */ |
| 217 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
| 218 | EXPORT_SYMBOL(sysctl_optmem_max); |
| 219 | |
| 220 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
| 221 | { |
| 222 | struct timeval tv; |
| 223 | |
| 224 | if (optlen < sizeof(tv)) |
| 225 | return -EINVAL; |
| 226 | if (copy_from_user(&tv, optval, sizeof(tv))) |
| 227 | return -EFAULT; |
| 228 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
| 229 | return -EDOM; |
| 230 | |
| 231 | if (tv.tv_sec < 0) { |
| 232 | static int warned __read_mostly; |
| 233 | |
| 234 | *timeo_p = 0; |
| 235 | if (warned < 10 && net_ratelimit()) { |
| 236 | warned++; |
| 237 | printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " |
| 238 | "tries to set negative timeout\n", |
| 239 | current->comm, task_pid_nr(current)); |
| 240 | } |
| 241 | return 0; |
| 242 | } |
| 243 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
| 244 | if (tv.tv_sec == 0 && tv.tv_usec == 0) |
| 245 | return 0; |
| 246 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) |
| 247 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | static void sock_warn_obsolete_bsdism(const char *name) |
| 252 | { |
| 253 | static int warned; |
| 254 | static char warncomm[TASK_COMM_LEN]; |
| 255 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 256 | strcpy(warncomm, current->comm); |
| 257 | printk(KERN_WARNING "process `%s' is using obsolete " |
| 258 | "%s SO_BSDCOMPAT\n", warncomm, name); |
| 259 | warned++; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | static void sock_disable_timestamp(struct sock *sk, int flag) |
| 264 | { |
| 265 | if (sock_flag(sk, flag)) { |
| 266 | sock_reset_flag(sk, flag); |
| 267 | if (!sock_flag(sk, SOCK_TIMESTAMP) && |
| 268 | !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) { |
| 269 | net_disable_timestamp(); |
| 270 | } |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | |
| 275 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 276 | { |
| 277 | int err = 0; |
| 278 | int skb_len; |
| 279 | |
| 280 | /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces |
| 281 | number of warnings when compiling with -W --ANK |
| 282 | */ |
| 283 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
| 284 | (unsigned)sk->sk_rcvbuf) { |
| 285 | err = -ENOMEM; |
| 286 | goto out; |
| 287 | } |
| 288 | |
| 289 | err = sk_filter(sk, skb); |
| 290 | if (err) |
| 291 | goto out; |
| 292 | |
| 293 | if (!sk_rmem_schedule(sk, skb->truesize)) { |
| 294 | err = -ENOBUFS; |
| 295 | goto out; |
| 296 | } |
| 297 | |
| 298 | skb->dev = NULL; |
| 299 | skb_set_owner_r(skb, sk); |
| 300 | |
| 301 | /* Cache the SKB length before we tack it onto the receive |
| 302 | * queue. Once it is added it no longer belongs to us and |
| 303 | * may be freed by other threads of control pulling packets |
| 304 | * from the queue. |
| 305 | */ |
| 306 | skb_len = skb->len; |
| 307 | |
| 308 | skb_queue_tail(&sk->sk_receive_queue, skb); |
| 309 | |
| 310 | if (!sock_flag(sk, SOCK_DEAD)) |
| 311 | sk->sk_data_ready(sk, skb_len); |
| 312 | out: |
| 313 | return err; |
| 314 | } |
| 315 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
| 316 | |
| 317 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
| 318 | { |
| 319 | int rc = NET_RX_SUCCESS; |
| 320 | |
| 321 | if (sk_filter(sk, skb)) |
| 322 | goto discard_and_relse; |
| 323 | |
| 324 | skb->dev = NULL; |
| 325 | |
| 326 | if (nested) |
| 327 | bh_lock_sock_nested(sk); |
| 328 | else |
| 329 | bh_lock_sock(sk); |
| 330 | if (!sock_owned_by_user(sk)) { |
| 331 | /* |
| 332 | * trylock + unlock semantics: |
| 333 | */ |
| 334 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); |
| 335 | |
| 336 | rc = sk_backlog_rcv(sk, skb); |
| 337 | |
| 338 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
| 339 | } else |
| 340 | sk_add_backlog(sk, skb); |
| 341 | bh_unlock_sock(sk); |
| 342 | out: |
| 343 | sock_put(sk); |
| 344 | return rc; |
| 345 | discard_and_relse: |
| 346 | kfree_skb(skb); |
| 347 | goto out; |
| 348 | } |
| 349 | EXPORT_SYMBOL(sk_receive_skb); |
| 350 | |
| 351 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
| 352 | { |
| 353 | struct dst_entry *dst = sk->sk_dst_cache; |
| 354 | |
| 355 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
| 356 | sk->sk_dst_cache = NULL; |
| 357 | dst_release(dst); |
| 358 | return NULL; |
| 359 | } |
| 360 | |
| 361 | return dst; |
| 362 | } |
| 363 | EXPORT_SYMBOL(__sk_dst_check); |
| 364 | |
| 365 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) |
| 366 | { |
| 367 | struct dst_entry *dst = sk_dst_get(sk); |
| 368 | |
| 369 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
| 370 | sk_dst_reset(sk); |
| 371 | dst_release(dst); |
| 372 | return NULL; |
| 373 | } |
| 374 | |
| 375 | return dst; |
| 376 | } |
| 377 | EXPORT_SYMBOL(sk_dst_check); |
| 378 | |
| 379 | static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) |
| 380 | { |
| 381 | int ret = -ENOPROTOOPT; |
| 382 | #ifdef CONFIG_NETDEVICES |
| 383 | struct net *net = sock_net(sk); |
| 384 | char devname[IFNAMSIZ]; |
| 385 | int index; |
| 386 | |
| 387 | /* Sorry... */ |
| 388 | ret = -EPERM; |
| 389 | if (!capable(CAP_NET_RAW)) |
| 390 | goto out; |
| 391 | |
| 392 | ret = -EINVAL; |
| 393 | if (optlen < 0) |
| 394 | goto out; |
| 395 | |
| 396 | /* Bind this socket to a particular device like "eth0", |
| 397 | * as specified in the passed interface name. If the |
| 398 | * name is "" or the option length is zero the socket |
| 399 | * is not bound. |
| 400 | */ |
| 401 | if (optlen > IFNAMSIZ - 1) |
| 402 | optlen = IFNAMSIZ - 1; |
| 403 | memset(devname, 0, sizeof(devname)); |
| 404 | |
| 405 | ret = -EFAULT; |
| 406 | if (copy_from_user(devname, optval, optlen)) |
| 407 | goto out; |
| 408 | |
| 409 | if (devname[0] == '\0') { |
| 410 | index = 0; |
| 411 | } else { |
| 412 | struct net_device *dev = dev_get_by_name(net, devname); |
| 413 | |
| 414 | ret = -ENODEV; |
| 415 | if (!dev) |
| 416 | goto out; |
| 417 | |
| 418 | index = dev->ifindex; |
| 419 | dev_put(dev); |
| 420 | } |
| 421 | |
| 422 | lock_sock(sk); |
| 423 | sk->sk_bound_dev_if = index; |
| 424 | sk_dst_reset(sk); |
| 425 | release_sock(sk); |
| 426 | |
| 427 | ret = 0; |
| 428 | |
| 429 | out: |
| 430 | #endif |
| 431 | |
| 432 | return ret; |
| 433 | } |
| 434 | |
| 435 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
| 436 | { |
| 437 | if (valbool) |
| 438 | sock_set_flag(sk, bit); |
| 439 | else |
| 440 | sock_reset_flag(sk, bit); |
| 441 | } |
| 442 | |
| 443 | /* |
| 444 | * This is meant for all protocols to use and covers goings on |
| 445 | * at the socket level. Everything here is generic. |
| 446 | */ |
| 447 | |
| 448 | int sock_setsockopt(struct socket *sock, int level, int optname, |
| 449 | char __user *optval, int optlen) |
| 450 | { |
| 451 | struct sock *sk = sock->sk; |
| 452 | int val; |
| 453 | int valbool; |
| 454 | struct linger ling; |
| 455 | int ret = 0; |
| 456 | |
| 457 | /* |
| 458 | * Options without arguments |
| 459 | */ |
| 460 | |
| 461 | if (optname == SO_BINDTODEVICE) |
| 462 | return sock_bindtodevice(sk, optval, optlen); |
| 463 | |
| 464 | if (optlen < sizeof(int)) |
| 465 | return -EINVAL; |
| 466 | |
| 467 | if (get_user(val, (int __user *)optval)) |
| 468 | return -EFAULT; |
| 469 | |
| 470 | valbool = val ? 1 : 0; |
| 471 | |
| 472 | lock_sock(sk); |
| 473 | |
| 474 | switch (optname) { |
| 475 | case SO_DEBUG: |
| 476 | if (val && !capable(CAP_NET_ADMIN)) |
| 477 | ret = -EACCES; |
| 478 | else |
| 479 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
| 480 | break; |
| 481 | case SO_REUSEADDR: |
| 482 | sk->sk_reuse = valbool; |
| 483 | break; |
| 484 | case SO_TYPE: |
| 485 | case SO_ERROR: |
| 486 | ret = -ENOPROTOOPT; |
| 487 | break; |
| 488 | case SO_DONTROUTE: |
| 489 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
| 490 | break; |
| 491 | case SO_BROADCAST: |
| 492 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); |
| 493 | break; |
| 494 | case SO_SNDBUF: |
| 495 | /* Don't error on this BSD doesn't and if you think |
| 496 | about it this is right. Otherwise apps have to |
| 497 | play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 498 | are treated in BSD as hints */ |
| 499 | |
| 500 | if (val > sysctl_wmem_max) |
| 501 | val = sysctl_wmem_max; |
| 502 | set_sndbuf: |
| 503 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| 504 | if ((val * 2) < SOCK_MIN_SNDBUF) |
| 505 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; |
| 506 | else |
| 507 | sk->sk_sndbuf = val * 2; |
| 508 | |
| 509 | /* |
| 510 | * Wake up sending tasks if we |
| 511 | * upped the value. |
| 512 | */ |
| 513 | sk->sk_write_space(sk); |
| 514 | break; |
| 515 | |
| 516 | case SO_SNDBUFFORCE: |
| 517 | if (!capable(CAP_NET_ADMIN)) { |
| 518 | ret = -EPERM; |
| 519 | break; |
| 520 | } |
| 521 | goto set_sndbuf; |
| 522 | |
| 523 | case SO_RCVBUF: |
| 524 | /* Don't error on this BSD doesn't and if you think |
| 525 | about it this is right. Otherwise apps have to |
| 526 | play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 527 | are treated in BSD as hints */ |
| 528 | |
| 529 | if (val > sysctl_rmem_max) |
| 530 | val = sysctl_rmem_max; |
| 531 | set_rcvbuf: |
| 532 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| 533 | /* |
| 534 | * We double it on the way in to account for |
| 535 | * "struct sk_buff" etc. overhead. Applications |
| 536 | * assume that the SO_RCVBUF setting they make will |
| 537 | * allow that much actual data to be received on that |
| 538 | * socket. |
| 539 | * |
| 540 | * Applications are unaware that "struct sk_buff" and |
| 541 | * other overheads allocate from the receive buffer |
| 542 | * during socket buffer allocation. |
| 543 | * |
| 544 | * And after considering the possible alternatives, |
| 545 | * returning the value we actually used in getsockopt |
| 546 | * is the most desirable behavior. |
| 547 | */ |
| 548 | if ((val * 2) < SOCK_MIN_RCVBUF) |
| 549 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; |
| 550 | else |
| 551 | sk->sk_rcvbuf = val * 2; |
| 552 | break; |
| 553 | |
| 554 | case SO_RCVBUFFORCE: |
| 555 | if (!capable(CAP_NET_ADMIN)) { |
| 556 | ret = -EPERM; |
| 557 | break; |
| 558 | } |
| 559 | goto set_rcvbuf; |
| 560 | |
| 561 | case SO_KEEPALIVE: |
| 562 | #ifdef CONFIG_INET |
| 563 | if (sk->sk_protocol == IPPROTO_TCP) |
| 564 | tcp_set_keepalive(sk, valbool); |
| 565 | #endif |
| 566 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
| 567 | break; |
| 568 | |
| 569 | case SO_OOBINLINE: |
| 570 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); |
| 571 | break; |
| 572 | |
| 573 | case SO_NO_CHECK: |
| 574 | sk->sk_no_check = valbool; |
| 575 | break; |
| 576 | |
| 577 | case SO_PRIORITY: |
| 578 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) |
| 579 | sk->sk_priority = val; |
| 580 | else |
| 581 | ret = -EPERM; |
| 582 | break; |
| 583 | |
| 584 | case SO_LINGER: |
| 585 | if (optlen < sizeof(ling)) { |
| 586 | ret = -EINVAL; /* 1003.1g */ |
| 587 | break; |
| 588 | } |
| 589 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
| 590 | ret = -EFAULT; |
| 591 | break; |
| 592 | } |
| 593 | if (!ling.l_onoff) |
| 594 | sock_reset_flag(sk, SOCK_LINGER); |
| 595 | else { |
| 596 | #if (BITS_PER_LONG == 32) |
| 597 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
| 598 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; |
| 599 | else |
| 600 | #endif |
| 601 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; |
| 602 | sock_set_flag(sk, SOCK_LINGER); |
| 603 | } |
| 604 | break; |
| 605 | |
| 606 | case SO_BSDCOMPAT: |
| 607 | sock_warn_obsolete_bsdism("setsockopt"); |
| 608 | break; |
| 609 | |
| 610 | case SO_PASSCRED: |
| 611 | if (valbool) |
| 612 | set_bit(SOCK_PASSCRED, &sock->flags); |
| 613 | else |
| 614 | clear_bit(SOCK_PASSCRED, &sock->flags); |
| 615 | break; |
| 616 | |
| 617 | case SO_TIMESTAMP: |
| 618 | case SO_TIMESTAMPNS: |
| 619 | if (valbool) { |
| 620 | if (optname == SO_TIMESTAMP) |
| 621 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 622 | else |
| 623 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); |
| 624 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
| 625 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
| 626 | } else { |
| 627 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
| 628 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 629 | } |
| 630 | break; |
| 631 | |
| 632 | case SO_TIMESTAMPING: |
| 633 | if (val & ~SOF_TIMESTAMPING_MASK) { |
| 634 | ret = EINVAL; |
| 635 | break; |
| 636 | } |
| 637 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, |
| 638 | val & SOF_TIMESTAMPING_TX_HARDWARE); |
| 639 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, |
| 640 | val & SOF_TIMESTAMPING_TX_SOFTWARE); |
| 641 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, |
| 642 | val & SOF_TIMESTAMPING_RX_HARDWARE); |
| 643 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
| 644 | sock_enable_timestamp(sk, |
| 645 | SOCK_TIMESTAMPING_RX_SOFTWARE); |
| 646 | else |
| 647 | sock_disable_timestamp(sk, |
| 648 | SOCK_TIMESTAMPING_RX_SOFTWARE); |
| 649 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, |
| 650 | val & SOF_TIMESTAMPING_SOFTWARE); |
| 651 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, |
| 652 | val & SOF_TIMESTAMPING_SYS_HARDWARE); |
| 653 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, |
| 654 | val & SOF_TIMESTAMPING_RAW_HARDWARE); |
| 655 | break; |
| 656 | |
| 657 | case SO_RCVLOWAT: |
| 658 | if (val < 0) |
| 659 | val = INT_MAX; |
| 660 | sk->sk_rcvlowat = val ? : 1; |
| 661 | break; |
| 662 | |
| 663 | case SO_RCVTIMEO: |
| 664 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); |
| 665 | break; |
| 666 | |
| 667 | case SO_SNDTIMEO: |
| 668 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); |
| 669 | break; |
| 670 | |
| 671 | case SO_ATTACH_FILTER: |
| 672 | ret = -EINVAL; |
| 673 | if (optlen == sizeof(struct sock_fprog)) { |
| 674 | struct sock_fprog fprog; |
| 675 | |
| 676 | ret = -EFAULT; |
| 677 | if (copy_from_user(&fprog, optval, sizeof(fprog))) |
| 678 | break; |
| 679 | |
| 680 | ret = sk_attach_filter(&fprog, sk); |
| 681 | } |
| 682 | break; |
| 683 | |
| 684 | case SO_DETACH_FILTER: |
| 685 | ret = sk_detach_filter(sk); |
| 686 | break; |
| 687 | |
| 688 | case SO_PASSSEC: |
| 689 | if (valbool) |
| 690 | set_bit(SOCK_PASSSEC, &sock->flags); |
| 691 | else |
| 692 | clear_bit(SOCK_PASSSEC, &sock->flags); |
| 693 | break; |
| 694 | case SO_MARK: |
| 695 | if (!capable(CAP_NET_ADMIN)) |
| 696 | ret = -EPERM; |
| 697 | else |
| 698 | sk->sk_mark = val; |
| 699 | break; |
| 700 | |
| 701 | /* We implement the SO_SNDLOWAT etc to |
| 702 | not be settable (1003.1g 5.3) */ |
| 703 | default: |
| 704 | ret = -ENOPROTOOPT; |
| 705 | break; |
| 706 | } |
| 707 | release_sock(sk); |
| 708 | return ret; |
| 709 | } |
| 710 | EXPORT_SYMBOL(sock_setsockopt); |
| 711 | |
| 712 | |
| 713 | int sock_getsockopt(struct socket *sock, int level, int optname, |
| 714 | char __user *optval, int __user *optlen) |
| 715 | { |
| 716 | struct sock *sk = sock->sk; |
| 717 | |
| 718 | union { |
| 719 | int val; |
| 720 | struct linger ling; |
| 721 | struct timeval tm; |
| 722 | } v; |
| 723 | |
| 724 | unsigned int lv = sizeof(int); |
| 725 | int len; |
| 726 | |
| 727 | if (get_user(len, optlen)) |
| 728 | return -EFAULT; |
| 729 | if (len < 0) |
| 730 | return -EINVAL; |
| 731 | |
| 732 | memset(&v, 0, sizeof(v)); |
| 733 | |
| 734 | switch (optname) { |
| 735 | case SO_DEBUG: |
| 736 | v.val = sock_flag(sk, SOCK_DBG); |
| 737 | break; |
| 738 | |
| 739 | case SO_DONTROUTE: |
| 740 | v.val = sock_flag(sk, SOCK_LOCALROUTE); |
| 741 | break; |
| 742 | |
| 743 | case SO_BROADCAST: |
| 744 | v.val = !!sock_flag(sk, SOCK_BROADCAST); |
| 745 | break; |
| 746 | |
| 747 | case SO_SNDBUF: |
| 748 | v.val = sk->sk_sndbuf; |
| 749 | break; |
| 750 | |
| 751 | case SO_RCVBUF: |
| 752 | v.val = sk->sk_rcvbuf; |
| 753 | break; |
| 754 | |
| 755 | case SO_REUSEADDR: |
| 756 | v.val = sk->sk_reuse; |
| 757 | break; |
| 758 | |
| 759 | case SO_KEEPALIVE: |
| 760 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); |
| 761 | break; |
| 762 | |
| 763 | case SO_TYPE: |
| 764 | v.val = sk->sk_type; |
| 765 | break; |
| 766 | |
| 767 | case SO_ERROR: |
| 768 | v.val = -sock_error(sk); |
| 769 | if (v.val == 0) |
| 770 | v.val = xchg(&sk->sk_err_soft, 0); |
| 771 | break; |
| 772 | |
| 773 | case SO_OOBINLINE: |
| 774 | v.val = !!sock_flag(sk, SOCK_URGINLINE); |
| 775 | break; |
| 776 | |
| 777 | case SO_NO_CHECK: |
| 778 | v.val = sk->sk_no_check; |
| 779 | break; |
| 780 | |
| 781 | case SO_PRIORITY: |
| 782 | v.val = sk->sk_priority; |
| 783 | break; |
| 784 | |
| 785 | case SO_LINGER: |
| 786 | lv = sizeof(v.ling); |
| 787 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); |
| 788 | v.ling.l_linger = sk->sk_lingertime / HZ; |
| 789 | break; |
| 790 | |
| 791 | case SO_BSDCOMPAT: |
| 792 | sock_warn_obsolete_bsdism("getsockopt"); |
| 793 | break; |
| 794 | |
| 795 | case SO_TIMESTAMP: |
| 796 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
| 797 | !sock_flag(sk, SOCK_RCVTSTAMPNS); |
| 798 | break; |
| 799 | |
| 800 | case SO_TIMESTAMPNS: |
| 801 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); |
| 802 | break; |
| 803 | |
| 804 | case SO_TIMESTAMPING: |
| 805 | v.val = 0; |
| 806 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) |
| 807 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; |
| 808 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) |
| 809 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; |
| 810 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) |
| 811 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; |
| 812 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) |
| 813 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; |
| 814 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) |
| 815 | v.val |= SOF_TIMESTAMPING_SOFTWARE; |
| 816 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) |
| 817 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; |
| 818 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) |
| 819 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; |
| 820 | break; |
| 821 | |
| 822 | case SO_RCVTIMEO: |
| 823 | lv = sizeof(struct timeval); |
| 824 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 825 | v.tm.tv_sec = 0; |
| 826 | v.tm.tv_usec = 0; |
| 827 | } else { |
| 828 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; |
| 829 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; |
| 830 | } |
| 831 | break; |
| 832 | |
| 833 | case SO_SNDTIMEO: |
| 834 | lv = sizeof(struct timeval); |
| 835 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 836 | v.tm.tv_sec = 0; |
| 837 | v.tm.tv_usec = 0; |
| 838 | } else { |
| 839 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; |
| 840 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; |
| 841 | } |
| 842 | break; |
| 843 | |
| 844 | case SO_RCVLOWAT: |
| 845 | v.val = sk->sk_rcvlowat; |
| 846 | break; |
| 847 | |
| 848 | case SO_SNDLOWAT: |
| 849 | v.val = 1; |
| 850 | break; |
| 851 | |
| 852 | case SO_PASSCRED: |
| 853 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; |
| 854 | break; |
| 855 | |
| 856 | case SO_PEERCRED: |
| 857 | if (len > sizeof(sk->sk_peercred)) |
| 858 | len = sizeof(sk->sk_peercred); |
| 859 | if (copy_to_user(optval, &sk->sk_peercred, len)) |
| 860 | return -EFAULT; |
| 861 | goto lenout; |
| 862 | |
| 863 | case SO_PEERNAME: |
| 864 | { |
| 865 | char address[128]; |
| 866 | |
| 867 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) |
| 868 | return -ENOTCONN; |
| 869 | if (lv < len) |
| 870 | return -EINVAL; |
| 871 | if (copy_to_user(optval, address, len)) |
| 872 | return -EFAULT; |
| 873 | goto lenout; |
| 874 | } |
| 875 | |
| 876 | /* Dubious BSD thing... Probably nobody even uses it, but |
| 877 | * the UNIX standard wants it for whatever reason... -DaveM |
| 878 | */ |
| 879 | case SO_ACCEPTCONN: |
| 880 | v.val = sk->sk_state == TCP_LISTEN; |
| 881 | break; |
| 882 | |
| 883 | case SO_PASSSEC: |
| 884 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; |
| 885 | break; |
| 886 | |
| 887 | case SO_PEERSEC: |
| 888 | return security_socket_getpeersec_stream(sock, optval, optlen, len); |
| 889 | |
| 890 | case SO_MARK: |
| 891 | v.val = sk->sk_mark; |
| 892 | break; |
| 893 | |
| 894 | default: |
| 895 | return -ENOPROTOOPT; |
| 896 | } |
| 897 | |
| 898 | if (len > lv) |
| 899 | len = lv; |
| 900 | if (copy_to_user(optval, &v, len)) |
| 901 | return -EFAULT; |
| 902 | lenout: |
| 903 | if (put_user(len, optlen)) |
| 904 | return -EFAULT; |
| 905 | return 0; |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * Initialize an sk_lock. |
| 910 | * |
| 911 | * (We also register the sk_lock with the lock validator.) |
| 912 | */ |
| 913 | static inline void sock_lock_init(struct sock *sk) |
| 914 | { |
| 915 | sock_lock_init_class_and_name(sk, |
| 916 | af_family_slock_key_strings[sk->sk_family], |
| 917 | af_family_slock_keys + sk->sk_family, |
| 918 | af_family_key_strings[sk->sk_family], |
| 919 | af_family_keys + sk->sk_family); |
| 920 | } |
| 921 | |
| 922 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
| 923 | { |
| 924 | #ifdef CONFIG_SECURITY_NETWORK |
| 925 | void *sptr = nsk->sk_security; |
| 926 | #endif |
| 927 | |
| 928 | memcpy(nsk, osk, osk->sk_prot->obj_size); |
| 929 | #ifdef CONFIG_SECURITY_NETWORK |
| 930 | nsk->sk_security = sptr; |
| 931 | security_sk_clone(osk, nsk); |
| 932 | #endif |
| 933 | } |
| 934 | |
| 935 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
| 936 | int family) |
| 937 | { |
| 938 | struct sock *sk; |
| 939 | struct kmem_cache *slab; |
| 940 | |
| 941 | slab = prot->slab; |
| 942 | if (slab != NULL) |
| 943 | sk = kmem_cache_alloc(slab, priority); |
| 944 | else |
| 945 | sk = kmalloc(prot->obj_size, priority); |
| 946 | |
| 947 | if (sk != NULL) { |
| 948 | if (security_sk_alloc(sk, family, priority)) |
| 949 | goto out_free; |
| 950 | |
| 951 | if (!try_module_get(prot->owner)) |
| 952 | goto out_free_sec; |
| 953 | } |
| 954 | |
| 955 | return sk; |
| 956 | |
| 957 | out_free_sec: |
| 958 | security_sk_free(sk); |
| 959 | out_free: |
| 960 | if (slab != NULL) |
| 961 | kmem_cache_free(slab, sk); |
| 962 | else |
| 963 | kfree(sk); |
| 964 | return NULL; |
| 965 | } |
| 966 | |
| 967 | static void sk_prot_free(struct proto *prot, struct sock *sk) |
| 968 | { |
| 969 | struct kmem_cache *slab; |
| 970 | struct module *owner; |
| 971 | |
| 972 | owner = prot->owner; |
| 973 | slab = prot->slab; |
| 974 | |
| 975 | security_sk_free(sk); |
| 976 | if (slab != NULL) |
| 977 | kmem_cache_free(slab, sk); |
| 978 | else |
| 979 | kfree(sk); |
| 980 | module_put(owner); |
| 981 | } |
| 982 | |
| 983 | /** |
| 984 | * sk_alloc - All socket objects are allocated here |
| 985 | * @net: the applicable net namespace |
| 986 | * @family: protocol family |
| 987 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 988 | * @prot: struct proto associated with this new sock instance |
| 989 | */ |
| 990 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
| 991 | struct proto *prot) |
| 992 | { |
| 993 | struct sock *sk; |
| 994 | |
| 995 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
| 996 | if (sk) { |
| 997 | sk->sk_family = family; |
| 998 | /* |
| 999 | * See comment in struct sock definition to understand |
| 1000 | * why we need sk_prot_creator -acme |
| 1001 | */ |
| 1002 | sk->sk_prot = sk->sk_prot_creator = prot; |
| 1003 | sock_lock_init(sk); |
| 1004 | sock_net_set(sk, get_net(net)); |
| 1005 | } |
| 1006 | |
| 1007 | return sk; |
| 1008 | } |
| 1009 | EXPORT_SYMBOL(sk_alloc); |
| 1010 | |
| 1011 | static void __sk_free(struct sock *sk) |
| 1012 | { |
| 1013 | struct sk_filter *filter; |
| 1014 | |
| 1015 | if (sk->sk_destruct) |
| 1016 | sk->sk_destruct(sk); |
| 1017 | |
| 1018 | filter = rcu_dereference(sk->sk_filter); |
| 1019 | if (filter) { |
| 1020 | sk_filter_uncharge(sk, filter); |
| 1021 | rcu_assign_pointer(sk->sk_filter, NULL); |
| 1022 | } |
| 1023 | |
| 1024 | sock_disable_timestamp(sk, SOCK_TIMESTAMP); |
| 1025 | sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE); |
| 1026 | |
| 1027 | if (atomic_read(&sk->sk_omem_alloc)) |
| 1028 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", |
| 1029 | __func__, atomic_read(&sk->sk_omem_alloc)); |
| 1030 | |
| 1031 | put_net(sock_net(sk)); |
| 1032 | sk_prot_free(sk->sk_prot_creator, sk); |
| 1033 | } |
| 1034 | |
| 1035 | void sk_free(struct sock *sk) |
| 1036 | { |
| 1037 | /* |
| 1038 | * We substract one from sk_wmem_alloc and can know if |
| 1039 | * some packets are still in some tx queue. |
| 1040 | * If not null, sock_wfree() will call __sk_free(sk) later |
| 1041 | */ |
| 1042 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) |
| 1043 | __sk_free(sk); |
| 1044 | } |
| 1045 | EXPORT_SYMBOL(sk_free); |
| 1046 | |
| 1047 | /* |
| 1048 | * Last sock_put should drop referrence to sk->sk_net. It has already |
| 1049 | * been dropped in sk_change_net. Taking referrence to stopping namespace |
| 1050 | * is not an option. |
| 1051 | * Take referrence to a socket to remove it from hash _alive_ and after that |
| 1052 | * destroy it in the context of init_net. |
| 1053 | */ |
| 1054 | void sk_release_kernel(struct sock *sk) |
| 1055 | { |
| 1056 | if (sk == NULL || sk->sk_socket == NULL) |
| 1057 | return; |
| 1058 | |
| 1059 | sock_hold(sk); |
| 1060 | sock_release(sk->sk_socket); |
| 1061 | release_net(sock_net(sk)); |
| 1062 | sock_net_set(sk, get_net(&init_net)); |
| 1063 | sock_put(sk); |
| 1064 | } |
| 1065 | EXPORT_SYMBOL(sk_release_kernel); |
| 1066 | |
| 1067 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
| 1068 | { |
| 1069 | struct sock *newsk; |
| 1070 | |
| 1071 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
| 1072 | if (newsk != NULL) { |
| 1073 | struct sk_filter *filter; |
| 1074 | |
| 1075 | sock_copy(newsk, sk); |
| 1076 | |
| 1077 | /* SANITY */ |
| 1078 | get_net(sock_net(newsk)); |
| 1079 | sk_node_init(&newsk->sk_node); |
| 1080 | sock_lock_init(newsk); |
| 1081 | bh_lock_sock(newsk); |
| 1082 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
| 1083 | |
| 1084 | atomic_set(&newsk->sk_rmem_alloc, 0); |
| 1085 | /* |
| 1086 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) |
| 1087 | */ |
| 1088 | atomic_set(&newsk->sk_wmem_alloc, 1); |
| 1089 | atomic_set(&newsk->sk_omem_alloc, 0); |
| 1090 | skb_queue_head_init(&newsk->sk_receive_queue); |
| 1091 | skb_queue_head_init(&newsk->sk_write_queue); |
| 1092 | #ifdef CONFIG_NET_DMA |
| 1093 | skb_queue_head_init(&newsk->sk_async_wait_queue); |
| 1094 | #endif |
| 1095 | |
| 1096 | rwlock_init(&newsk->sk_dst_lock); |
| 1097 | rwlock_init(&newsk->sk_callback_lock); |
| 1098 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
| 1099 | af_callback_keys + newsk->sk_family, |
| 1100 | af_family_clock_key_strings[newsk->sk_family]); |
| 1101 | |
| 1102 | newsk->sk_dst_cache = NULL; |
| 1103 | newsk->sk_wmem_queued = 0; |
| 1104 | newsk->sk_forward_alloc = 0; |
| 1105 | newsk->sk_send_head = NULL; |
| 1106 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
| 1107 | |
| 1108 | sock_reset_flag(newsk, SOCK_DONE); |
| 1109 | skb_queue_head_init(&newsk->sk_error_queue); |
| 1110 | |
| 1111 | filter = newsk->sk_filter; |
| 1112 | if (filter != NULL) |
| 1113 | sk_filter_charge(newsk, filter); |
| 1114 | |
| 1115 | if (unlikely(xfrm_sk_clone_policy(newsk))) { |
| 1116 | /* It is still raw copy of parent, so invalidate |
| 1117 | * destructor and make plain sk_free() */ |
| 1118 | newsk->sk_destruct = NULL; |
| 1119 | sk_free(newsk); |
| 1120 | newsk = NULL; |
| 1121 | goto out; |
| 1122 | } |
| 1123 | |
| 1124 | newsk->sk_err = 0; |
| 1125 | newsk->sk_priority = 0; |
| 1126 | atomic_set(&newsk->sk_refcnt, 2); |
| 1127 | |
| 1128 | /* |
| 1129 | * Increment the counter in the same struct proto as the master |
| 1130 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that |
| 1131 | * is the same as sk->sk_prot->socks, as this field was copied |
| 1132 | * with memcpy). |
| 1133 | * |
| 1134 | * This _changes_ the previous behaviour, where |
| 1135 | * tcp_create_openreq_child always was incrementing the |
| 1136 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have |
| 1137 | * to be taken into account in all callers. -acme |
| 1138 | */ |
| 1139 | sk_refcnt_debug_inc(newsk); |
| 1140 | sk_set_socket(newsk, NULL); |
| 1141 | newsk->sk_sleep = NULL; |
| 1142 | |
| 1143 | if (newsk->sk_prot->sockets_allocated) |
| 1144 | percpu_counter_inc(newsk->sk_prot->sockets_allocated); |
| 1145 | } |
| 1146 | out: |
| 1147 | return newsk; |
| 1148 | } |
| 1149 | EXPORT_SYMBOL_GPL(sk_clone); |
| 1150 | |
| 1151 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
| 1152 | { |
| 1153 | __sk_dst_set(sk, dst); |
| 1154 | sk->sk_route_caps = dst->dev->features; |
| 1155 | if (sk->sk_route_caps & NETIF_F_GSO) |
| 1156 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
| 1157 | if (sk_can_gso(sk)) { |
| 1158 | if (dst->header_len) { |
| 1159 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
| 1160 | } else { |
| 1161 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
| 1162 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
| 1163 | } |
| 1164 | } |
| 1165 | } |
| 1166 | EXPORT_SYMBOL_GPL(sk_setup_caps); |
| 1167 | |
| 1168 | void __init sk_init(void) |
| 1169 | { |
| 1170 | if (num_physpages <= 4096) { |
| 1171 | sysctl_wmem_max = 32767; |
| 1172 | sysctl_rmem_max = 32767; |
| 1173 | sysctl_wmem_default = 32767; |
| 1174 | sysctl_rmem_default = 32767; |
| 1175 | } else if (num_physpages >= 131072) { |
| 1176 | sysctl_wmem_max = 131071; |
| 1177 | sysctl_rmem_max = 131071; |
| 1178 | } |
| 1179 | } |
| 1180 | |
| 1181 | /* |
| 1182 | * Simple resource managers for sockets. |
| 1183 | */ |
| 1184 | |
| 1185 | |
| 1186 | /* |
| 1187 | * Write buffer destructor automatically called from kfree_skb. |
| 1188 | */ |
| 1189 | void sock_wfree(struct sk_buff *skb) |
| 1190 | { |
| 1191 | struct sock *sk = skb->sk; |
| 1192 | int res; |
| 1193 | |
| 1194 | /* In case it might be waiting for more memory. */ |
| 1195 | res = atomic_sub_return(skb->truesize, &sk->sk_wmem_alloc); |
| 1196 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) |
| 1197 | sk->sk_write_space(sk); |
| 1198 | /* |
| 1199 | * if sk_wmem_alloc reached 0, we are last user and should |
| 1200 | * free this sock, as sk_free() call could not do it. |
| 1201 | */ |
| 1202 | if (res == 0) |
| 1203 | __sk_free(sk); |
| 1204 | } |
| 1205 | EXPORT_SYMBOL(sock_wfree); |
| 1206 | |
| 1207 | /* |
| 1208 | * Read buffer destructor automatically called from kfree_skb. |
| 1209 | */ |
| 1210 | void sock_rfree(struct sk_buff *skb) |
| 1211 | { |
| 1212 | struct sock *sk = skb->sk; |
| 1213 | |
| 1214 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); |
| 1215 | sk_mem_uncharge(skb->sk, skb->truesize); |
| 1216 | } |
| 1217 | EXPORT_SYMBOL(sock_rfree); |
| 1218 | |
| 1219 | |
| 1220 | int sock_i_uid(struct sock *sk) |
| 1221 | { |
| 1222 | int uid; |
| 1223 | |
| 1224 | read_lock(&sk->sk_callback_lock); |
| 1225 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; |
| 1226 | read_unlock(&sk->sk_callback_lock); |
| 1227 | return uid; |
| 1228 | } |
| 1229 | EXPORT_SYMBOL(sock_i_uid); |
| 1230 | |
| 1231 | unsigned long sock_i_ino(struct sock *sk) |
| 1232 | { |
| 1233 | unsigned long ino; |
| 1234 | |
| 1235 | read_lock(&sk->sk_callback_lock); |
| 1236 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
| 1237 | read_unlock(&sk->sk_callback_lock); |
| 1238 | return ino; |
| 1239 | } |
| 1240 | EXPORT_SYMBOL(sock_i_ino); |
| 1241 | |
| 1242 | /* |
| 1243 | * Allocate a skb from the socket's send buffer. |
| 1244 | */ |
| 1245 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
| 1246 | gfp_t priority) |
| 1247 | { |
| 1248 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
| 1249 | struct sk_buff *skb = alloc_skb(size, priority); |
| 1250 | if (skb) { |
| 1251 | skb_set_owner_w(skb, sk); |
| 1252 | return skb; |
| 1253 | } |
| 1254 | } |
| 1255 | return NULL; |
| 1256 | } |
| 1257 | EXPORT_SYMBOL(sock_wmalloc); |
| 1258 | |
| 1259 | /* |
| 1260 | * Allocate a skb from the socket's receive buffer. |
| 1261 | */ |
| 1262 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
| 1263 | gfp_t priority) |
| 1264 | { |
| 1265 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
| 1266 | struct sk_buff *skb = alloc_skb(size, priority); |
| 1267 | if (skb) { |
| 1268 | skb_set_owner_r(skb, sk); |
| 1269 | return skb; |
| 1270 | } |
| 1271 | } |
| 1272 | return NULL; |
| 1273 | } |
| 1274 | |
| 1275 | /* |
| 1276 | * Allocate a memory block from the socket's option memory buffer. |
| 1277 | */ |
| 1278 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
| 1279 | { |
| 1280 | if ((unsigned)size <= sysctl_optmem_max && |
| 1281 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
| 1282 | void *mem; |
| 1283 | /* First do the add, to avoid the race if kmalloc |
| 1284 | * might sleep. |
| 1285 | */ |
| 1286 | atomic_add(size, &sk->sk_omem_alloc); |
| 1287 | mem = kmalloc(size, priority); |
| 1288 | if (mem) |
| 1289 | return mem; |
| 1290 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1291 | } |
| 1292 | return NULL; |
| 1293 | } |
| 1294 | EXPORT_SYMBOL(sock_kmalloc); |
| 1295 | |
| 1296 | /* |
| 1297 | * Free an option memory block. |
| 1298 | */ |
| 1299 | void sock_kfree_s(struct sock *sk, void *mem, int size) |
| 1300 | { |
| 1301 | kfree(mem); |
| 1302 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1303 | } |
| 1304 | EXPORT_SYMBOL(sock_kfree_s); |
| 1305 | |
| 1306 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
| 1307 | I think, these locks should be removed for datagram sockets. |
| 1308 | */ |
| 1309 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
| 1310 | { |
| 1311 | DEFINE_WAIT(wait); |
| 1312 | |
| 1313 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1314 | for (;;) { |
| 1315 | if (!timeo) |
| 1316 | break; |
| 1317 | if (signal_pending(current)) |
| 1318 | break; |
| 1319 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 1320 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 1321 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
| 1322 | break; |
| 1323 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1324 | break; |
| 1325 | if (sk->sk_err) |
| 1326 | break; |
| 1327 | timeo = schedule_timeout(timeo); |
| 1328 | } |
| 1329 | finish_wait(sk->sk_sleep, &wait); |
| 1330 | return timeo; |
| 1331 | } |
| 1332 | |
| 1333 | |
| 1334 | /* |
| 1335 | * Generic send/receive buffer handlers |
| 1336 | */ |
| 1337 | |
| 1338 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
| 1339 | unsigned long data_len, int noblock, |
| 1340 | int *errcode) |
| 1341 | { |
| 1342 | struct sk_buff *skb; |
| 1343 | gfp_t gfp_mask; |
| 1344 | long timeo; |
| 1345 | int err; |
| 1346 | |
| 1347 | gfp_mask = sk->sk_allocation; |
| 1348 | if (gfp_mask & __GFP_WAIT) |
| 1349 | gfp_mask |= __GFP_REPEAT; |
| 1350 | |
| 1351 | timeo = sock_sndtimeo(sk, noblock); |
| 1352 | while (1) { |
| 1353 | err = sock_error(sk); |
| 1354 | if (err != 0) |
| 1355 | goto failure; |
| 1356 | |
| 1357 | err = -EPIPE; |
| 1358 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1359 | goto failure; |
| 1360 | |
| 1361 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
| 1362 | skb = alloc_skb(header_len, gfp_mask); |
| 1363 | if (skb) { |
| 1364 | int npages; |
| 1365 | int i; |
| 1366 | |
| 1367 | /* No pages, we're done... */ |
| 1368 | if (!data_len) |
| 1369 | break; |
| 1370 | |
| 1371 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; |
| 1372 | skb->truesize += data_len; |
| 1373 | skb_shinfo(skb)->nr_frags = npages; |
| 1374 | for (i = 0; i < npages; i++) { |
| 1375 | struct page *page; |
| 1376 | skb_frag_t *frag; |
| 1377 | |
| 1378 | page = alloc_pages(sk->sk_allocation, 0); |
| 1379 | if (!page) { |
| 1380 | err = -ENOBUFS; |
| 1381 | skb_shinfo(skb)->nr_frags = i; |
| 1382 | kfree_skb(skb); |
| 1383 | goto failure; |
| 1384 | } |
| 1385 | |
| 1386 | frag = &skb_shinfo(skb)->frags[i]; |
| 1387 | frag->page = page; |
| 1388 | frag->page_offset = 0; |
| 1389 | frag->size = (data_len >= PAGE_SIZE ? |
| 1390 | PAGE_SIZE : |
| 1391 | data_len); |
| 1392 | data_len -= PAGE_SIZE; |
| 1393 | } |
| 1394 | |
| 1395 | /* Full success... */ |
| 1396 | break; |
| 1397 | } |
| 1398 | err = -ENOBUFS; |
| 1399 | goto failure; |
| 1400 | } |
| 1401 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1402 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 1403 | err = -EAGAIN; |
| 1404 | if (!timeo) |
| 1405 | goto failure; |
| 1406 | if (signal_pending(current)) |
| 1407 | goto interrupted; |
| 1408 | timeo = sock_wait_for_wmem(sk, timeo); |
| 1409 | } |
| 1410 | |
| 1411 | skb_set_owner_w(skb, sk); |
| 1412 | return skb; |
| 1413 | |
| 1414 | interrupted: |
| 1415 | err = sock_intr_errno(timeo); |
| 1416 | failure: |
| 1417 | *errcode = err; |
| 1418 | return NULL; |
| 1419 | } |
| 1420 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
| 1421 | |
| 1422 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
| 1423 | int noblock, int *errcode) |
| 1424 | { |
| 1425 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); |
| 1426 | } |
| 1427 | EXPORT_SYMBOL(sock_alloc_send_skb); |
| 1428 | |
| 1429 | static void __lock_sock(struct sock *sk) |
| 1430 | { |
| 1431 | DEFINE_WAIT(wait); |
| 1432 | |
| 1433 | for (;;) { |
| 1434 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
| 1435 | TASK_UNINTERRUPTIBLE); |
| 1436 | spin_unlock_bh(&sk->sk_lock.slock); |
| 1437 | schedule(); |
| 1438 | spin_lock_bh(&sk->sk_lock.slock); |
| 1439 | if (!sock_owned_by_user(sk)) |
| 1440 | break; |
| 1441 | } |
| 1442 | finish_wait(&sk->sk_lock.wq, &wait); |
| 1443 | } |
| 1444 | |
| 1445 | static void __release_sock(struct sock *sk) |
| 1446 | { |
| 1447 | struct sk_buff *skb = sk->sk_backlog.head; |
| 1448 | |
| 1449 | do { |
| 1450 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
| 1451 | bh_unlock_sock(sk); |
| 1452 | |
| 1453 | do { |
| 1454 | struct sk_buff *next = skb->next; |
| 1455 | |
| 1456 | skb->next = NULL; |
| 1457 | sk_backlog_rcv(sk, skb); |
| 1458 | |
| 1459 | /* |
| 1460 | * We are in process context here with softirqs |
| 1461 | * disabled, use cond_resched_softirq() to preempt. |
| 1462 | * This is safe to do because we've taken the backlog |
| 1463 | * queue private: |
| 1464 | */ |
| 1465 | cond_resched_softirq(); |
| 1466 | |
| 1467 | skb = next; |
| 1468 | } while (skb != NULL); |
| 1469 | |
| 1470 | bh_lock_sock(sk); |
| 1471 | } while ((skb = sk->sk_backlog.head) != NULL); |
| 1472 | } |
| 1473 | |
| 1474 | /** |
| 1475 | * sk_wait_data - wait for data to arrive at sk_receive_queue |
| 1476 | * @sk: sock to wait on |
| 1477 | * @timeo: for how long |
| 1478 | * |
| 1479 | * Now socket state including sk->sk_err is changed only under lock, |
| 1480 | * hence we may omit checks after joining wait queue. |
| 1481 | * We check receive queue before schedule() only as optimization; |
| 1482 | * it is very likely that release_sock() added new data. |
| 1483 | */ |
| 1484 | int sk_wait_data(struct sock *sk, long *timeo) |
| 1485 | { |
| 1486 | int rc; |
| 1487 | DEFINE_WAIT(wait); |
| 1488 | |
| 1489 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 1490 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 1491 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); |
| 1492 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 1493 | finish_wait(sk->sk_sleep, &wait); |
| 1494 | return rc; |
| 1495 | } |
| 1496 | EXPORT_SYMBOL(sk_wait_data); |
| 1497 | |
| 1498 | /** |
| 1499 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated |
| 1500 | * @sk: socket |
| 1501 | * @size: memory size to allocate |
| 1502 | * @kind: allocation type |
| 1503 | * |
| 1504 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means |
| 1505 | * rmem allocation. This function assumes that protocols which have |
| 1506 | * memory_pressure use sk_wmem_queued as write buffer accounting. |
| 1507 | */ |
| 1508 | int __sk_mem_schedule(struct sock *sk, int size, int kind) |
| 1509 | { |
| 1510 | struct proto *prot = sk->sk_prot; |
| 1511 | int amt = sk_mem_pages(size); |
| 1512 | int allocated; |
| 1513 | |
| 1514 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; |
| 1515 | allocated = atomic_add_return(amt, prot->memory_allocated); |
| 1516 | |
| 1517 | /* Under limit. */ |
| 1518 | if (allocated <= prot->sysctl_mem[0]) { |
| 1519 | if (prot->memory_pressure && *prot->memory_pressure) |
| 1520 | *prot->memory_pressure = 0; |
| 1521 | return 1; |
| 1522 | } |
| 1523 | |
| 1524 | /* Under pressure. */ |
| 1525 | if (allocated > prot->sysctl_mem[1]) |
| 1526 | if (prot->enter_memory_pressure) |
| 1527 | prot->enter_memory_pressure(sk); |
| 1528 | |
| 1529 | /* Over hard limit. */ |
| 1530 | if (allocated > prot->sysctl_mem[2]) |
| 1531 | goto suppress_allocation; |
| 1532 | |
| 1533 | /* guarantee minimum buffer size under pressure */ |
| 1534 | if (kind == SK_MEM_RECV) { |
| 1535 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) |
| 1536 | return 1; |
| 1537 | } else { /* SK_MEM_SEND */ |
| 1538 | if (sk->sk_type == SOCK_STREAM) { |
| 1539 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) |
| 1540 | return 1; |
| 1541 | } else if (atomic_read(&sk->sk_wmem_alloc) < |
| 1542 | prot->sysctl_wmem[0]) |
| 1543 | return 1; |
| 1544 | } |
| 1545 | |
| 1546 | if (prot->memory_pressure) { |
| 1547 | int alloc; |
| 1548 | |
| 1549 | if (!*prot->memory_pressure) |
| 1550 | return 1; |
| 1551 | alloc = percpu_counter_read_positive(prot->sockets_allocated); |
| 1552 | if (prot->sysctl_mem[2] > alloc * |
| 1553 | sk_mem_pages(sk->sk_wmem_queued + |
| 1554 | atomic_read(&sk->sk_rmem_alloc) + |
| 1555 | sk->sk_forward_alloc)) |
| 1556 | return 1; |
| 1557 | } |
| 1558 | |
| 1559 | suppress_allocation: |
| 1560 | |
| 1561 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { |
| 1562 | sk_stream_moderate_sndbuf(sk); |
| 1563 | |
| 1564 | /* Fail only if socket is _under_ its sndbuf. |
| 1565 | * In this case we cannot block, so that we have to fail. |
| 1566 | */ |
| 1567 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) |
| 1568 | return 1; |
| 1569 | } |
| 1570 | |
| 1571 | /* Alas. Undo changes. */ |
| 1572 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; |
| 1573 | atomic_sub(amt, prot->memory_allocated); |
| 1574 | return 0; |
| 1575 | } |
| 1576 | EXPORT_SYMBOL(__sk_mem_schedule); |
| 1577 | |
| 1578 | /** |
| 1579 | * __sk_reclaim - reclaim memory_allocated |
| 1580 | * @sk: socket |
| 1581 | */ |
| 1582 | void __sk_mem_reclaim(struct sock *sk) |
| 1583 | { |
| 1584 | struct proto *prot = sk->sk_prot; |
| 1585 | |
| 1586 | atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, |
| 1587 | prot->memory_allocated); |
| 1588 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; |
| 1589 | |
| 1590 | if (prot->memory_pressure && *prot->memory_pressure && |
| 1591 | (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) |
| 1592 | *prot->memory_pressure = 0; |
| 1593 | } |
| 1594 | EXPORT_SYMBOL(__sk_mem_reclaim); |
| 1595 | |
| 1596 | |
| 1597 | /* |
| 1598 | * Set of default routines for initialising struct proto_ops when |
| 1599 | * the protocol does not support a particular function. In certain |
| 1600 | * cases where it makes no sense for a protocol to have a "do nothing" |
| 1601 | * function, some default processing is provided. |
| 1602 | */ |
| 1603 | |
| 1604 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) |
| 1605 | { |
| 1606 | return -EOPNOTSUPP; |
| 1607 | } |
| 1608 | EXPORT_SYMBOL(sock_no_bind); |
| 1609 | |
| 1610 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
| 1611 | int len, int flags) |
| 1612 | { |
| 1613 | return -EOPNOTSUPP; |
| 1614 | } |
| 1615 | EXPORT_SYMBOL(sock_no_connect); |
| 1616 | |
| 1617 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) |
| 1618 | { |
| 1619 | return -EOPNOTSUPP; |
| 1620 | } |
| 1621 | EXPORT_SYMBOL(sock_no_socketpair); |
| 1622 | |
| 1623 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) |
| 1624 | { |
| 1625 | return -EOPNOTSUPP; |
| 1626 | } |
| 1627 | EXPORT_SYMBOL(sock_no_accept); |
| 1628 | |
| 1629 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
| 1630 | int *len, int peer) |
| 1631 | { |
| 1632 | return -EOPNOTSUPP; |
| 1633 | } |
| 1634 | EXPORT_SYMBOL(sock_no_getname); |
| 1635 | |
| 1636 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
| 1637 | { |
| 1638 | return 0; |
| 1639 | } |
| 1640 | EXPORT_SYMBOL(sock_no_poll); |
| 1641 | |
| 1642 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 1643 | { |
| 1644 | return -EOPNOTSUPP; |
| 1645 | } |
| 1646 | EXPORT_SYMBOL(sock_no_ioctl); |
| 1647 | |
| 1648 | int sock_no_listen(struct socket *sock, int backlog) |
| 1649 | { |
| 1650 | return -EOPNOTSUPP; |
| 1651 | } |
| 1652 | EXPORT_SYMBOL(sock_no_listen); |
| 1653 | |
| 1654 | int sock_no_shutdown(struct socket *sock, int how) |
| 1655 | { |
| 1656 | return -EOPNOTSUPP; |
| 1657 | } |
| 1658 | EXPORT_SYMBOL(sock_no_shutdown); |
| 1659 | |
| 1660 | int sock_no_setsockopt(struct socket *sock, int level, int optname, |
| 1661 | char __user *optval, int optlen) |
| 1662 | { |
| 1663 | return -EOPNOTSUPP; |
| 1664 | } |
| 1665 | EXPORT_SYMBOL(sock_no_setsockopt); |
| 1666 | |
| 1667 | int sock_no_getsockopt(struct socket *sock, int level, int optname, |
| 1668 | char __user *optval, int __user *optlen) |
| 1669 | { |
| 1670 | return -EOPNOTSUPP; |
| 1671 | } |
| 1672 | EXPORT_SYMBOL(sock_no_getsockopt); |
| 1673 | |
| 1674 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, |
| 1675 | size_t len) |
| 1676 | { |
| 1677 | return -EOPNOTSUPP; |
| 1678 | } |
| 1679 | EXPORT_SYMBOL(sock_no_sendmsg); |
| 1680 | |
| 1681 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, |
| 1682 | size_t len, int flags) |
| 1683 | { |
| 1684 | return -EOPNOTSUPP; |
| 1685 | } |
| 1686 | EXPORT_SYMBOL(sock_no_recvmsg); |
| 1687 | |
| 1688 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
| 1689 | { |
| 1690 | /* Mirror missing mmap method error code */ |
| 1691 | return -ENODEV; |
| 1692 | } |
| 1693 | EXPORT_SYMBOL(sock_no_mmap); |
| 1694 | |
| 1695 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) |
| 1696 | { |
| 1697 | ssize_t res; |
| 1698 | struct msghdr msg = {.msg_flags = flags}; |
| 1699 | struct kvec iov; |
| 1700 | char *kaddr = kmap(page); |
| 1701 | iov.iov_base = kaddr + offset; |
| 1702 | iov.iov_len = size; |
| 1703 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); |
| 1704 | kunmap(page); |
| 1705 | return res; |
| 1706 | } |
| 1707 | EXPORT_SYMBOL(sock_no_sendpage); |
| 1708 | |
| 1709 | /* |
| 1710 | * Default Socket Callbacks |
| 1711 | */ |
| 1712 | |
| 1713 | static void sock_def_wakeup(struct sock *sk) |
| 1714 | { |
| 1715 | read_lock(&sk->sk_callback_lock); |
| 1716 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 1717 | wake_up_interruptible_all(sk->sk_sleep); |
| 1718 | read_unlock(&sk->sk_callback_lock); |
| 1719 | } |
| 1720 | |
| 1721 | static void sock_def_error_report(struct sock *sk) |
| 1722 | { |
| 1723 | read_lock(&sk->sk_callback_lock); |
| 1724 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 1725 | wake_up_interruptible_poll(sk->sk_sleep, POLLERR); |
| 1726 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
| 1727 | read_unlock(&sk->sk_callback_lock); |
| 1728 | } |
| 1729 | |
| 1730 | static void sock_def_readable(struct sock *sk, int len) |
| 1731 | { |
| 1732 | read_lock(&sk->sk_callback_lock); |
| 1733 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 1734 | wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN | |
| 1735 | POLLRDNORM | POLLRDBAND); |
| 1736 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
| 1737 | read_unlock(&sk->sk_callback_lock); |
| 1738 | } |
| 1739 | |
| 1740 | static void sock_def_write_space(struct sock *sk) |
| 1741 | { |
| 1742 | read_lock(&sk->sk_callback_lock); |
| 1743 | |
| 1744 | /* Do not wake up a writer until he can make "significant" |
| 1745 | * progress. --DaveM |
| 1746 | */ |
| 1747 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
| 1748 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 1749 | wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT | |
| 1750 | POLLWRNORM | POLLWRBAND); |
| 1751 | |
| 1752 | /* Should agree with poll, otherwise some programs break */ |
| 1753 | if (sock_writeable(sk)) |
| 1754 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
| 1755 | } |
| 1756 | |
| 1757 | read_unlock(&sk->sk_callback_lock); |
| 1758 | } |
| 1759 | |
| 1760 | static void sock_def_destruct(struct sock *sk) |
| 1761 | { |
| 1762 | kfree(sk->sk_protinfo); |
| 1763 | } |
| 1764 | |
| 1765 | void sk_send_sigurg(struct sock *sk) |
| 1766 | { |
| 1767 | if (sk->sk_socket && sk->sk_socket->file) |
| 1768 | if (send_sigurg(&sk->sk_socket->file->f_owner)) |
| 1769 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
| 1770 | } |
| 1771 | EXPORT_SYMBOL(sk_send_sigurg); |
| 1772 | |
| 1773 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, |
| 1774 | unsigned long expires) |
| 1775 | { |
| 1776 | if (!mod_timer(timer, expires)) |
| 1777 | sock_hold(sk); |
| 1778 | } |
| 1779 | EXPORT_SYMBOL(sk_reset_timer); |
| 1780 | |
| 1781 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) |
| 1782 | { |
| 1783 | if (timer_pending(timer) && del_timer(timer)) |
| 1784 | __sock_put(sk); |
| 1785 | } |
| 1786 | EXPORT_SYMBOL(sk_stop_timer); |
| 1787 | |
| 1788 | void sock_init_data(struct socket *sock, struct sock *sk) |
| 1789 | { |
| 1790 | skb_queue_head_init(&sk->sk_receive_queue); |
| 1791 | skb_queue_head_init(&sk->sk_write_queue); |
| 1792 | skb_queue_head_init(&sk->sk_error_queue); |
| 1793 | #ifdef CONFIG_NET_DMA |
| 1794 | skb_queue_head_init(&sk->sk_async_wait_queue); |
| 1795 | #endif |
| 1796 | |
| 1797 | sk->sk_send_head = NULL; |
| 1798 | |
| 1799 | init_timer(&sk->sk_timer); |
| 1800 | |
| 1801 | sk->sk_allocation = GFP_KERNEL; |
| 1802 | sk->sk_rcvbuf = sysctl_rmem_default; |
| 1803 | sk->sk_sndbuf = sysctl_wmem_default; |
| 1804 | sk->sk_state = TCP_CLOSE; |
| 1805 | sk_set_socket(sk, sock); |
| 1806 | |
| 1807 | sock_set_flag(sk, SOCK_ZAPPED); |
| 1808 | |
| 1809 | if (sock) { |
| 1810 | sk->sk_type = sock->type; |
| 1811 | sk->sk_sleep = &sock->wait; |
| 1812 | sock->sk = sk; |
| 1813 | } else |
| 1814 | sk->sk_sleep = NULL; |
| 1815 | |
| 1816 | rwlock_init(&sk->sk_dst_lock); |
| 1817 | rwlock_init(&sk->sk_callback_lock); |
| 1818 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
| 1819 | af_callback_keys + sk->sk_family, |
| 1820 | af_family_clock_key_strings[sk->sk_family]); |
| 1821 | |
| 1822 | sk->sk_state_change = sock_def_wakeup; |
| 1823 | sk->sk_data_ready = sock_def_readable; |
| 1824 | sk->sk_write_space = sock_def_write_space; |
| 1825 | sk->sk_error_report = sock_def_error_report; |
| 1826 | sk->sk_destruct = sock_def_destruct; |
| 1827 | |
| 1828 | sk->sk_sndmsg_page = NULL; |
| 1829 | sk->sk_sndmsg_off = 0; |
| 1830 | |
| 1831 | sk->sk_peercred.pid = 0; |
| 1832 | sk->sk_peercred.uid = -1; |
| 1833 | sk->sk_peercred.gid = -1; |
| 1834 | sk->sk_write_pending = 0; |
| 1835 | sk->sk_rcvlowat = 1; |
| 1836 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| 1837 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
| 1838 | |
| 1839 | sk->sk_stamp = ktime_set(-1L, 0); |
| 1840 | |
| 1841 | atomic_set(&sk->sk_refcnt, 1); |
| 1842 | atomic_set(&sk->sk_wmem_alloc, 1); |
| 1843 | atomic_set(&sk->sk_drops, 0); |
| 1844 | } |
| 1845 | EXPORT_SYMBOL(sock_init_data); |
| 1846 | |
| 1847 | void lock_sock_nested(struct sock *sk, int subclass) |
| 1848 | { |
| 1849 | might_sleep(); |
| 1850 | spin_lock_bh(&sk->sk_lock.slock); |
| 1851 | if (sk->sk_lock.owned) |
| 1852 | __lock_sock(sk); |
| 1853 | sk->sk_lock.owned = 1; |
| 1854 | spin_unlock(&sk->sk_lock.slock); |
| 1855 | /* |
| 1856 | * The sk_lock has mutex_lock() semantics here: |
| 1857 | */ |
| 1858 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
| 1859 | local_bh_enable(); |
| 1860 | } |
| 1861 | EXPORT_SYMBOL(lock_sock_nested); |
| 1862 | |
| 1863 | void release_sock(struct sock *sk) |
| 1864 | { |
| 1865 | /* |
| 1866 | * The sk_lock has mutex_unlock() semantics: |
| 1867 | */ |
| 1868 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
| 1869 | |
| 1870 | spin_lock_bh(&sk->sk_lock.slock); |
| 1871 | if (sk->sk_backlog.tail) |
| 1872 | __release_sock(sk); |
| 1873 | sk->sk_lock.owned = 0; |
| 1874 | if (waitqueue_active(&sk->sk_lock.wq)) |
| 1875 | wake_up(&sk->sk_lock.wq); |
| 1876 | spin_unlock_bh(&sk->sk_lock.slock); |
| 1877 | } |
| 1878 | EXPORT_SYMBOL(release_sock); |
| 1879 | |
| 1880 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
| 1881 | { |
| 1882 | struct timeval tv; |
| 1883 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
| 1884 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
| 1885 | tv = ktime_to_timeval(sk->sk_stamp); |
| 1886 | if (tv.tv_sec == -1) |
| 1887 | return -ENOENT; |
| 1888 | if (tv.tv_sec == 0) { |
| 1889 | sk->sk_stamp = ktime_get_real(); |
| 1890 | tv = ktime_to_timeval(sk->sk_stamp); |
| 1891 | } |
| 1892 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; |
| 1893 | } |
| 1894 | EXPORT_SYMBOL(sock_get_timestamp); |
| 1895 | |
| 1896 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
| 1897 | { |
| 1898 | struct timespec ts; |
| 1899 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
| 1900 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
| 1901 | ts = ktime_to_timespec(sk->sk_stamp); |
| 1902 | if (ts.tv_sec == -1) |
| 1903 | return -ENOENT; |
| 1904 | if (ts.tv_sec == 0) { |
| 1905 | sk->sk_stamp = ktime_get_real(); |
| 1906 | ts = ktime_to_timespec(sk->sk_stamp); |
| 1907 | } |
| 1908 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; |
| 1909 | } |
| 1910 | EXPORT_SYMBOL(sock_get_timestampns); |
| 1911 | |
| 1912 | void sock_enable_timestamp(struct sock *sk, int flag) |
| 1913 | { |
| 1914 | if (!sock_flag(sk, flag)) { |
| 1915 | sock_set_flag(sk, flag); |
| 1916 | /* |
| 1917 | * we just set one of the two flags which require net |
| 1918 | * time stamping, but time stamping might have been on |
| 1919 | * already because of the other one |
| 1920 | */ |
| 1921 | if (!sock_flag(sk, |
| 1922 | flag == SOCK_TIMESTAMP ? |
| 1923 | SOCK_TIMESTAMPING_RX_SOFTWARE : |
| 1924 | SOCK_TIMESTAMP)) |
| 1925 | net_enable_timestamp(); |
| 1926 | } |
| 1927 | } |
| 1928 | |
| 1929 | /* |
| 1930 | * Get a socket option on an socket. |
| 1931 | * |
| 1932 | * FIX: POSIX 1003.1g is very ambiguous here. It states that |
| 1933 | * asynchronous errors should be reported by getsockopt. We assume |
| 1934 | * this means if you specify SO_ERROR (otherwise whats the point of it). |
| 1935 | */ |
| 1936 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 1937 | char __user *optval, int __user *optlen) |
| 1938 | { |
| 1939 | struct sock *sk = sock->sk; |
| 1940 | |
| 1941 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 1942 | } |
| 1943 | EXPORT_SYMBOL(sock_common_getsockopt); |
| 1944 | |
| 1945 | #ifdef CONFIG_COMPAT |
| 1946 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 1947 | char __user *optval, int __user *optlen) |
| 1948 | { |
| 1949 | struct sock *sk = sock->sk; |
| 1950 | |
| 1951 | if (sk->sk_prot->compat_getsockopt != NULL) |
| 1952 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
| 1953 | optval, optlen); |
| 1954 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 1955 | } |
| 1956 | EXPORT_SYMBOL(compat_sock_common_getsockopt); |
| 1957 | #endif |
| 1958 | |
| 1959 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1960 | struct msghdr *msg, size_t size, int flags) |
| 1961 | { |
| 1962 | struct sock *sk = sock->sk; |
| 1963 | int addr_len = 0; |
| 1964 | int err; |
| 1965 | |
| 1966 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, |
| 1967 | flags & ~MSG_DONTWAIT, &addr_len); |
| 1968 | if (err >= 0) |
| 1969 | msg->msg_namelen = addr_len; |
| 1970 | return err; |
| 1971 | } |
| 1972 | EXPORT_SYMBOL(sock_common_recvmsg); |
| 1973 | |
| 1974 | /* |
| 1975 | * Set socket options on an inet socket. |
| 1976 | */ |
| 1977 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
| 1978 | char __user *optval, int optlen) |
| 1979 | { |
| 1980 | struct sock *sk = sock->sk; |
| 1981 | |
| 1982 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 1983 | } |
| 1984 | EXPORT_SYMBOL(sock_common_setsockopt); |
| 1985 | |
| 1986 | #ifdef CONFIG_COMPAT |
| 1987 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
| 1988 | char __user *optval, int optlen) |
| 1989 | { |
| 1990 | struct sock *sk = sock->sk; |
| 1991 | |
| 1992 | if (sk->sk_prot->compat_setsockopt != NULL) |
| 1993 | return sk->sk_prot->compat_setsockopt(sk, level, optname, |
| 1994 | optval, optlen); |
| 1995 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 1996 | } |
| 1997 | EXPORT_SYMBOL(compat_sock_common_setsockopt); |
| 1998 | #endif |
| 1999 | |
| 2000 | void sk_common_release(struct sock *sk) |
| 2001 | { |
| 2002 | if (sk->sk_prot->destroy) |
| 2003 | sk->sk_prot->destroy(sk); |
| 2004 | |
| 2005 | /* |
| 2006 | * Observation: when sock_common_release is called, processes have |
| 2007 | * no access to socket. But net still has. |
| 2008 | * Step one, detach it from networking: |
| 2009 | * |
| 2010 | * A. Remove from hash tables. |
| 2011 | */ |
| 2012 | |
| 2013 | sk->sk_prot->unhash(sk); |
| 2014 | |
| 2015 | /* |
| 2016 | * In this point socket cannot receive new packets, but it is possible |
| 2017 | * that some packets are in flight because some CPU runs receiver and |
| 2018 | * did hash table lookup before we unhashed socket. They will achieve |
| 2019 | * receive queue and will be purged by socket destructor. |
| 2020 | * |
| 2021 | * Also we still have packets pending on receive queue and probably, |
| 2022 | * our own packets waiting in device queues. sock_destroy will drain |
| 2023 | * receive queue, but transmitted packets will delay socket destruction |
| 2024 | * until the last reference will be released. |
| 2025 | */ |
| 2026 | |
| 2027 | sock_orphan(sk); |
| 2028 | |
| 2029 | xfrm_sk_free_policy(sk); |
| 2030 | |
| 2031 | sk_refcnt_debug_release(sk); |
| 2032 | sock_put(sk); |
| 2033 | } |
| 2034 | EXPORT_SYMBOL(sk_common_release); |
| 2035 | |
| 2036 | static DEFINE_RWLOCK(proto_list_lock); |
| 2037 | static LIST_HEAD(proto_list); |
| 2038 | |
| 2039 | #ifdef CONFIG_PROC_FS |
| 2040 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ |
| 2041 | struct prot_inuse { |
| 2042 | int val[PROTO_INUSE_NR]; |
| 2043 | }; |
| 2044 | |
| 2045 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); |
| 2046 | |
| 2047 | #ifdef CONFIG_NET_NS |
| 2048 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
| 2049 | { |
| 2050 | int cpu = smp_processor_id(); |
| 2051 | per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val; |
| 2052 | } |
| 2053 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2054 | |
| 2055 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
| 2056 | { |
| 2057 | int cpu, idx = prot->inuse_idx; |
| 2058 | int res = 0; |
| 2059 | |
| 2060 | for_each_possible_cpu(cpu) |
| 2061 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; |
| 2062 | |
| 2063 | return res >= 0 ? res : 0; |
| 2064 | } |
| 2065 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
| 2066 | |
| 2067 | static int sock_inuse_init_net(struct net *net) |
| 2068 | { |
| 2069 | net->core.inuse = alloc_percpu(struct prot_inuse); |
| 2070 | return net->core.inuse ? 0 : -ENOMEM; |
| 2071 | } |
| 2072 | |
| 2073 | static void sock_inuse_exit_net(struct net *net) |
| 2074 | { |
| 2075 | free_percpu(net->core.inuse); |
| 2076 | } |
| 2077 | |
| 2078 | static struct pernet_operations net_inuse_ops = { |
| 2079 | .init = sock_inuse_init_net, |
| 2080 | .exit = sock_inuse_exit_net, |
| 2081 | }; |
| 2082 | |
| 2083 | static __init int net_inuse_init(void) |
| 2084 | { |
| 2085 | if (register_pernet_subsys(&net_inuse_ops)) |
| 2086 | panic("Cannot initialize net inuse counters"); |
| 2087 | |
| 2088 | return 0; |
| 2089 | } |
| 2090 | |
| 2091 | core_initcall(net_inuse_init); |
| 2092 | #else |
| 2093 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
| 2094 | |
| 2095 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
| 2096 | { |
| 2097 | __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val; |
| 2098 | } |
| 2099 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2100 | |
| 2101 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
| 2102 | { |
| 2103 | int cpu, idx = prot->inuse_idx; |
| 2104 | int res = 0; |
| 2105 | |
| 2106 | for_each_possible_cpu(cpu) |
| 2107 | res += per_cpu(prot_inuse, cpu).val[idx]; |
| 2108 | |
| 2109 | return res >= 0 ? res : 0; |
| 2110 | } |
| 2111 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
| 2112 | #endif |
| 2113 | |
| 2114 | static void assign_proto_idx(struct proto *prot) |
| 2115 | { |
| 2116 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); |
| 2117 | |
| 2118 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { |
| 2119 | printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); |
| 2120 | return; |
| 2121 | } |
| 2122 | |
| 2123 | set_bit(prot->inuse_idx, proto_inuse_idx); |
| 2124 | } |
| 2125 | |
| 2126 | static void release_proto_idx(struct proto *prot) |
| 2127 | { |
| 2128 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) |
| 2129 | clear_bit(prot->inuse_idx, proto_inuse_idx); |
| 2130 | } |
| 2131 | #else |
| 2132 | static inline void assign_proto_idx(struct proto *prot) |
| 2133 | { |
| 2134 | } |
| 2135 | |
| 2136 | static inline void release_proto_idx(struct proto *prot) |
| 2137 | { |
| 2138 | } |
| 2139 | #endif |
| 2140 | |
| 2141 | int proto_register(struct proto *prot, int alloc_slab) |
| 2142 | { |
| 2143 | if (alloc_slab) { |
| 2144 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, |
| 2145 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
| 2146 | NULL); |
| 2147 | |
| 2148 | if (prot->slab == NULL) { |
| 2149 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", |
| 2150 | prot->name); |
| 2151 | goto out; |
| 2152 | } |
| 2153 | |
| 2154 | if (prot->rsk_prot != NULL) { |
| 2155 | static const char mask[] = "request_sock_%s"; |
| 2156 | |
| 2157 | prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
| 2158 | if (prot->rsk_prot->slab_name == NULL) |
| 2159 | goto out_free_sock_slab; |
| 2160 | |
| 2161 | sprintf(prot->rsk_prot->slab_name, mask, prot->name); |
| 2162 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, |
| 2163 | prot->rsk_prot->obj_size, 0, |
| 2164 | SLAB_HWCACHE_ALIGN, NULL); |
| 2165 | |
| 2166 | if (prot->rsk_prot->slab == NULL) { |
| 2167 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", |
| 2168 | prot->name); |
| 2169 | goto out_free_request_sock_slab_name; |
| 2170 | } |
| 2171 | } |
| 2172 | |
| 2173 | if (prot->twsk_prot != NULL) { |
| 2174 | static const char mask[] = "tw_sock_%s"; |
| 2175 | |
| 2176 | prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
| 2177 | |
| 2178 | if (prot->twsk_prot->twsk_slab_name == NULL) |
| 2179 | goto out_free_request_sock_slab; |
| 2180 | |
| 2181 | sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name); |
| 2182 | prot->twsk_prot->twsk_slab = |
| 2183 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
| 2184 | prot->twsk_prot->twsk_obj_size, |
| 2185 | 0, |
| 2186 | SLAB_HWCACHE_ALIGN | |
| 2187 | prot->slab_flags, |
| 2188 | NULL); |
| 2189 | if (prot->twsk_prot->twsk_slab == NULL) |
| 2190 | goto out_free_timewait_sock_slab_name; |
| 2191 | } |
| 2192 | } |
| 2193 | |
| 2194 | write_lock(&proto_list_lock); |
| 2195 | list_add(&prot->node, &proto_list); |
| 2196 | assign_proto_idx(prot); |
| 2197 | write_unlock(&proto_list_lock); |
| 2198 | return 0; |
| 2199 | |
| 2200 | out_free_timewait_sock_slab_name: |
| 2201 | kfree(prot->twsk_prot->twsk_slab_name); |
| 2202 | out_free_request_sock_slab: |
| 2203 | if (prot->rsk_prot && prot->rsk_prot->slab) { |
| 2204 | kmem_cache_destroy(prot->rsk_prot->slab); |
| 2205 | prot->rsk_prot->slab = NULL; |
| 2206 | } |
| 2207 | out_free_request_sock_slab_name: |
| 2208 | kfree(prot->rsk_prot->slab_name); |
| 2209 | out_free_sock_slab: |
| 2210 | kmem_cache_destroy(prot->slab); |
| 2211 | prot->slab = NULL; |
| 2212 | out: |
| 2213 | return -ENOBUFS; |
| 2214 | } |
| 2215 | EXPORT_SYMBOL(proto_register); |
| 2216 | |
| 2217 | void proto_unregister(struct proto *prot) |
| 2218 | { |
| 2219 | write_lock(&proto_list_lock); |
| 2220 | release_proto_idx(prot); |
| 2221 | list_del(&prot->node); |
| 2222 | write_unlock(&proto_list_lock); |
| 2223 | |
| 2224 | if (prot->slab != NULL) { |
| 2225 | kmem_cache_destroy(prot->slab); |
| 2226 | prot->slab = NULL; |
| 2227 | } |
| 2228 | |
| 2229 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
| 2230 | kmem_cache_destroy(prot->rsk_prot->slab); |
| 2231 | kfree(prot->rsk_prot->slab_name); |
| 2232 | prot->rsk_prot->slab = NULL; |
| 2233 | } |
| 2234 | |
| 2235 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
| 2236 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
| 2237 | kfree(prot->twsk_prot->twsk_slab_name); |
| 2238 | prot->twsk_prot->twsk_slab = NULL; |
| 2239 | } |
| 2240 | } |
| 2241 | EXPORT_SYMBOL(proto_unregister); |
| 2242 | |
| 2243 | #ifdef CONFIG_PROC_FS |
| 2244 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
| 2245 | __acquires(proto_list_lock) |
| 2246 | { |
| 2247 | read_lock(&proto_list_lock); |
| 2248 | return seq_list_start_head(&proto_list, *pos); |
| 2249 | } |
| 2250 | |
| 2251 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2252 | { |
| 2253 | return seq_list_next(v, &proto_list, pos); |
| 2254 | } |
| 2255 | |
| 2256 | static void proto_seq_stop(struct seq_file *seq, void *v) |
| 2257 | __releases(proto_list_lock) |
| 2258 | { |
| 2259 | read_unlock(&proto_list_lock); |
| 2260 | } |
| 2261 | |
| 2262 | static char proto_method_implemented(const void *method) |
| 2263 | { |
| 2264 | return method == NULL ? 'n' : 'y'; |
| 2265 | } |
| 2266 | |
| 2267 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) |
| 2268 | { |
| 2269 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " |
| 2270 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
| 2271 | proto->name, |
| 2272 | proto->obj_size, |
| 2273 | sock_prot_inuse_get(seq_file_net(seq), proto), |
| 2274 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, |
| 2275 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", |
| 2276 | proto->max_header, |
| 2277 | proto->slab == NULL ? "no" : "yes", |
| 2278 | module_name(proto->owner), |
| 2279 | proto_method_implemented(proto->close), |
| 2280 | proto_method_implemented(proto->connect), |
| 2281 | proto_method_implemented(proto->disconnect), |
| 2282 | proto_method_implemented(proto->accept), |
| 2283 | proto_method_implemented(proto->ioctl), |
| 2284 | proto_method_implemented(proto->init), |
| 2285 | proto_method_implemented(proto->destroy), |
| 2286 | proto_method_implemented(proto->shutdown), |
| 2287 | proto_method_implemented(proto->setsockopt), |
| 2288 | proto_method_implemented(proto->getsockopt), |
| 2289 | proto_method_implemented(proto->sendmsg), |
| 2290 | proto_method_implemented(proto->recvmsg), |
| 2291 | proto_method_implemented(proto->sendpage), |
| 2292 | proto_method_implemented(proto->bind), |
| 2293 | proto_method_implemented(proto->backlog_rcv), |
| 2294 | proto_method_implemented(proto->hash), |
| 2295 | proto_method_implemented(proto->unhash), |
| 2296 | proto_method_implemented(proto->get_port), |
| 2297 | proto_method_implemented(proto->enter_memory_pressure)); |
| 2298 | } |
| 2299 | |
| 2300 | static int proto_seq_show(struct seq_file *seq, void *v) |
| 2301 | { |
| 2302 | if (v == &proto_list) |
| 2303 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
| 2304 | "protocol", |
| 2305 | "size", |
| 2306 | "sockets", |
| 2307 | "memory", |
| 2308 | "press", |
| 2309 | "maxhdr", |
| 2310 | "slab", |
| 2311 | "module", |
| 2312 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); |
| 2313 | else |
| 2314 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
| 2315 | return 0; |
| 2316 | } |
| 2317 | |
| 2318 | static const struct seq_operations proto_seq_ops = { |
| 2319 | .start = proto_seq_start, |
| 2320 | .next = proto_seq_next, |
| 2321 | .stop = proto_seq_stop, |
| 2322 | .show = proto_seq_show, |
| 2323 | }; |
| 2324 | |
| 2325 | static int proto_seq_open(struct inode *inode, struct file *file) |
| 2326 | { |
| 2327 | return seq_open_net(inode, file, &proto_seq_ops, |
| 2328 | sizeof(struct seq_net_private)); |
| 2329 | } |
| 2330 | |
| 2331 | static const struct file_operations proto_seq_fops = { |
| 2332 | .owner = THIS_MODULE, |
| 2333 | .open = proto_seq_open, |
| 2334 | .read = seq_read, |
| 2335 | .llseek = seq_lseek, |
| 2336 | .release = seq_release_net, |
| 2337 | }; |
| 2338 | |
| 2339 | static __net_init int proto_init_net(struct net *net) |
| 2340 | { |
| 2341 | if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) |
| 2342 | return -ENOMEM; |
| 2343 | |
| 2344 | return 0; |
| 2345 | } |
| 2346 | |
| 2347 | static __net_exit void proto_exit_net(struct net *net) |
| 2348 | { |
| 2349 | proc_net_remove(net, "protocols"); |
| 2350 | } |
| 2351 | |
| 2352 | |
| 2353 | static __net_initdata struct pernet_operations proto_net_ops = { |
| 2354 | .init = proto_init_net, |
| 2355 | .exit = proto_exit_net, |
| 2356 | }; |
| 2357 | |
| 2358 | static int __init proto_init(void) |
| 2359 | { |
| 2360 | return register_pernet_subsys(&proto_net_ops); |
| 2361 | } |
| 2362 | |
| 2363 | subsys_initcall(proto_init); |
| 2364 | |
| 2365 | #endif /* PROC_FS */ |