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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * Generic socket support routines. Memory allocators, socket lock/release | |
8 | * handler for protocols to use and generic option handler. | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
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 | |
4ec93edb | 35 | * code. The ACK stuff can wait and needs major |
1da177e4 LT |
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: | |
1da177e4 LT |
84 | */ |
85 | ||
e005d193 JP |
86 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
87 | ||
80b14dee | 88 | #include <asm/unaligned.h> |
4fc268d2 | 89 | #include <linux/capability.h> |
1da177e4 | 90 | #include <linux/errno.h> |
cb820f8e | 91 | #include <linux/errqueue.h> |
1da177e4 LT |
92 | #include <linux/types.h> |
93 | #include <linux/socket.h> | |
94 | #include <linux/in.h> | |
95 | #include <linux/kernel.h> | |
1da177e4 LT |
96 | #include <linux/module.h> |
97 | #include <linux/proc_fs.h> | |
98 | #include <linux/seq_file.h> | |
99 | #include <linux/sched.h> | |
f1083048 | 100 | #include <linux/sched/mm.h> |
1da177e4 LT |
101 | #include <linux/timer.h> |
102 | #include <linux/string.h> | |
103 | #include <linux/sockios.h> | |
104 | #include <linux/net.h> | |
105 | #include <linux/mm.h> | |
106 | #include <linux/slab.h> | |
107 | #include <linux/interrupt.h> | |
108 | #include <linux/poll.h> | |
109 | #include <linux/tcp.h> | |
110 | #include <linux/init.h> | |
a1f8e7f7 | 111 | #include <linux/highmem.h> |
3f551f94 | 112 | #include <linux/user_namespace.h> |
c5905afb | 113 | #include <linux/static_key.h> |
3969eb38 | 114 | #include <linux/memcontrol.h> |
8c1ae10d | 115 | #include <linux/prefetch.h> |
1da177e4 | 116 | |
7c0f6ba6 | 117 | #include <linux/uaccess.h> |
1da177e4 LT |
118 | |
119 | #include <linux/netdevice.h> | |
120 | #include <net/protocol.h> | |
121 | #include <linux/skbuff.h> | |
457c4cbc | 122 | #include <net/net_namespace.h> |
2e6599cb | 123 | #include <net/request_sock.h> |
1da177e4 | 124 | #include <net/sock.h> |
20d49473 | 125 | #include <linux/net_tstamp.h> |
1da177e4 LT |
126 | #include <net/xfrm.h> |
127 | #include <linux/ipsec.h> | |
f8451725 | 128 | #include <net/cls_cgroup.h> |
5bc1421e | 129 | #include <net/netprio_cgroup.h> |
eb4cb008 | 130 | #include <linux/sock_diag.h> |
1da177e4 LT |
131 | |
132 | #include <linux/filter.h> | |
538950a1 | 133 | #include <net/sock_reuseport.h> |
6ac99e8f | 134 | #include <net/bpf_sk_storage.h> |
1da177e4 | 135 | |
3847ce32 SM |
136 | #include <trace/events/sock.h> |
137 | ||
1da177e4 | 138 | #include <net/tcp.h> |
076bb0c8 | 139 | #include <net/busy_poll.h> |
06021292 | 140 | |
36b77a52 | 141 | static DEFINE_MUTEX(proto_list_mutex); |
d1a4c0b3 GC |
142 | static LIST_HEAD(proto_list); |
143 | ||
648845ab TZ |
144 | static void sock_inuse_add(struct net *net, int val); |
145 | ||
a3b299da EB |
146 | /** |
147 | * sk_ns_capable - General socket capability test | |
148 | * @sk: Socket to use a capability on or through | |
149 | * @user_ns: The user namespace of the capability to use | |
150 | * @cap: The capability to use | |
151 | * | |
152 | * Test to see if the opener of the socket had when the socket was | |
153 | * created and the current process has the capability @cap in the user | |
154 | * namespace @user_ns. | |
155 | */ | |
156 | bool sk_ns_capable(const struct sock *sk, | |
157 | struct user_namespace *user_ns, int cap) | |
158 | { | |
159 | return file_ns_capable(sk->sk_socket->file, user_ns, cap) && | |
160 | ns_capable(user_ns, cap); | |
161 | } | |
162 | EXPORT_SYMBOL(sk_ns_capable); | |
163 | ||
164 | /** | |
165 | * sk_capable - Socket global capability test | |
166 | * @sk: Socket to use a capability on or through | |
e793c0f7 | 167 | * @cap: The global capability to use |
a3b299da EB |
168 | * |
169 | * Test to see if the opener of the socket had when the socket was | |
170 | * created and the current process has the capability @cap in all user | |
171 | * namespaces. | |
172 | */ | |
173 | bool sk_capable(const struct sock *sk, int cap) | |
174 | { | |
175 | return sk_ns_capable(sk, &init_user_ns, cap); | |
176 | } | |
177 | EXPORT_SYMBOL(sk_capable); | |
178 | ||
179 | /** | |
180 | * sk_net_capable - Network namespace socket capability test | |
181 | * @sk: Socket to use a capability on or through | |
182 | * @cap: The capability to use | |
183 | * | |
e793c0f7 | 184 | * Test to see if the opener of the socket had when the socket was created |
a3b299da EB |
185 | * and the current process has the capability @cap over the network namespace |
186 | * the socket is a member of. | |
187 | */ | |
188 | bool sk_net_capable(const struct sock *sk, int cap) | |
189 | { | |
190 | return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); | |
191 | } | |
192 | EXPORT_SYMBOL(sk_net_capable); | |
193 | ||
da21f24d IM |
194 | /* |
195 | * Each address family might have different locking rules, so we have | |
cdfbabfb DH |
196 | * one slock key per address family and separate keys for internal and |
197 | * userspace sockets. | |
da21f24d | 198 | */ |
a5b5bb9a | 199 | static struct lock_class_key af_family_keys[AF_MAX]; |
cdfbabfb | 200 | static struct lock_class_key af_family_kern_keys[AF_MAX]; |
a5b5bb9a | 201 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
cdfbabfb | 202 | static struct lock_class_key af_family_kern_slock_keys[AF_MAX]; |
a5b5bb9a | 203 | |
a5b5bb9a IM |
204 | /* |
205 | * Make lock validator output more readable. (we pre-construct these | |
206 | * strings build-time, so that runtime initialization of socket | |
207 | * locks is fast): | |
208 | */ | |
cdfbabfb DH |
209 | |
210 | #define _sock_locks(x) \ | |
211 | x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \ | |
212 | x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \ | |
213 | x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \ | |
214 | x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \ | |
215 | x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \ | |
216 | x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \ | |
217 | x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \ | |
218 | x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \ | |
219 | x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \ | |
220 | x "27" , x "28" , x "AF_CAN" , \ | |
221 | x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \ | |
222 | x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \ | |
223 | x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \ | |
224 | x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \ | |
68e8b849 BT |
225 | x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \ |
226 | x "AF_MAX" | |
cdfbabfb | 227 | |
36cbd3dc | 228 | static const char *const af_family_key_strings[AF_MAX+1] = { |
cdfbabfb | 229 | _sock_locks("sk_lock-") |
a5b5bb9a | 230 | }; |
36cbd3dc | 231 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
cdfbabfb | 232 | _sock_locks("slock-") |
a5b5bb9a | 233 | }; |
36cbd3dc | 234 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
cdfbabfb DH |
235 | _sock_locks("clock-") |
236 | }; | |
237 | ||
238 | static const char *const af_family_kern_key_strings[AF_MAX+1] = { | |
239 | _sock_locks("k-sk_lock-") | |
240 | }; | |
241 | static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = { | |
242 | _sock_locks("k-slock-") | |
243 | }; | |
244 | static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = { | |
245 | _sock_locks("k-clock-") | |
443aef0e | 246 | }; |
581319c5 | 247 | static const char *const af_family_rlock_key_strings[AF_MAX+1] = { |
6b431d50 | 248 | _sock_locks("rlock-") |
581319c5 PA |
249 | }; |
250 | static const char *const af_family_wlock_key_strings[AF_MAX+1] = { | |
6b431d50 | 251 | _sock_locks("wlock-") |
581319c5 PA |
252 | }; |
253 | static const char *const af_family_elock_key_strings[AF_MAX+1] = { | |
6b431d50 | 254 | _sock_locks("elock-") |
581319c5 | 255 | }; |
da21f24d IM |
256 | |
257 | /* | |
581319c5 | 258 | * sk_callback_lock and sk queues locking rules are per-address-family, |
da21f24d IM |
259 | * so split the lock classes by using a per-AF key: |
260 | */ | |
261 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
581319c5 PA |
262 | static struct lock_class_key af_rlock_keys[AF_MAX]; |
263 | static struct lock_class_key af_wlock_keys[AF_MAX]; | |
264 | static struct lock_class_key af_elock_keys[AF_MAX]; | |
cdfbabfb | 265 | static struct lock_class_key af_kern_callback_keys[AF_MAX]; |
da21f24d | 266 | |
1da177e4 | 267 | /* Run time adjustable parameters. */ |
ab32ea5d | 268 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 269 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 270 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 271 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
272 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
273 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 274 | |
25985edc | 275 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 276 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 277 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 278 | |
b245be1f WB |
279 | int sysctl_tstamp_allow_data __read_mostly = 1; |
280 | ||
a7950ae8 DB |
281 | DEFINE_STATIC_KEY_FALSE(memalloc_socks_key); |
282 | EXPORT_SYMBOL_GPL(memalloc_socks_key); | |
c93bdd0e | 283 | |
7cb02404 MG |
284 | /** |
285 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
286 | * @sk: socket to set it on | |
287 | * | |
288 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
289 | * It's the responsibility of the admin to adjust min_free_kbytes | |
290 | * to meet the requirements | |
291 | */ | |
292 | void sk_set_memalloc(struct sock *sk) | |
293 | { | |
294 | sock_set_flag(sk, SOCK_MEMALLOC); | |
295 | sk->sk_allocation |= __GFP_MEMALLOC; | |
a7950ae8 | 296 | static_branch_inc(&memalloc_socks_key); |
7cb02404 MG |
297 | } |
298 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
299 | ||
300 | void sk_clear_memalloc(struct sock *sk) | |
301 | { | |
302 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
303 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
a7950ae8 | 304 | static_branch_dec(&memalloc_socks_key); |
c76562b6 MG |
305 | |
306 | /* | |
307 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
5d753610 MG |
308 | * progress of swapping. SOCK_MEMALLOC may be cleared while |
309 | * it has rmem allocations due to the last swapfile being deactivated | |
310 | * but there is a risk that the socket is unusable due to exceeding | |
311 | * the rmem limits. Reclaim the reserves and obey rmem limits again. | |
c76562b6 | 312 | */ |
5d753610 | 313 | sk_mem_reclaim(sk); |
7cb02404 MG |
314 | } |
315 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
316 | ||
b4b9e355 MG |
317 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
318 | { | |
319 | int ret; | |
f1083048 | 320 | unsigned int noreclaim_flag; |
b4b9e355 MG |
321 | |
322 | /* these should have been dropped before queueing */ | |
323 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
324 | ||
f1083048 | 325 | noreclaim_flag = memalloc_noreclaim_save(); |
b4b9e355 | 326 | ret = sk->sk_backlog_rcv(sk, skb); |
f1083048 | 327 | memalloc_noreclaim_restore(noreclaim_flag); |
b4b9e355 MG |
328 | |
329 | return ret; | |
330 | } | |
331 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
332 | ||
a9beb86a | 333 | static int sock_get_timeout(long timeo, void *optval, bool old_timeval) |
fe0c72f3 | 334 | { |
a9beb86a DD |
335 | struct __kernel_sock_timeval tv; |
336 | int size; | |
fe0c72f3 AB |
337 | |
338 | if (timeo == MAX_SCHEDULE_TIMEOUT) { | |
339 | tv.tv_sec = 0; | |
340 | tv.tv_usec = 0; | |
341 | } else { | |
342 | tv.tv_sec = timeo / HZ; | |
343 | tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ; | |
344 | } | |
345 | ||
e6986423 | 346 | if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) { |
fe0c72f3 AB |
347 | struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec }; |
348 | *(struct old_timeval32 *)optval = tv32; | |
349 | return sizeof(tv32); | |
350 | } | |
351 | ||
a9beb86a DD |
352 | if (old_timeval) { |
353 | struct __kernel_old_timeval old_tv; | |
354 | old_tv.tv_sec = tv.tv_sec; | |
355 | old_tv.tv_usec = tv.tv_usec; | |
356 | *(struct __kernel_old_timeval *)optval = old_tv; | |
357 | size = sizeof(old_tv); | |
358 | } else { | |
359 | *(struct __kernel_sock_timeval *)optval = tv; | |
360 | size = sizeof(tv); | |
361 | } | |
362 | ||
363 | return size; | |
fe0c72f3 AB |
364 | } |
365 | ||
a9beb86a | 366 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval) |
1da177e4 | 367 | { |
a9beb86a | 368 | struct __kernel_sock_timeval tv; |
1da177e4 | 369 | |
e6986423 | 370 | if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) { |
fe0c72f3 AB |
371 | struct old_timeval32 tv32; |
372 | ||
373 | if (optlen < sizeof(tv32)) | |
374 | return -EINVAL; | |
375 | ||
376 | if (copy_from_user(&tv32, optval, sizeof(tv32))) | |
377 | return -EFAULT; | |
378 | tv.tv_sec = tv32.tv_sec; | |
379 | tv.tv_usec = tv32.tv_usec; | |
a9beb86a DD |
380 | } else if (old_timeval) { |
381 | struct __kernel_old_timeval old_tv; | |
382 | ||
383 | if (optlen < sizeof(old_tv)) | |
384 | return -EINVAL; | |
385 | if (copy_from_user(&old_tv, optval, sizeof(old_tv))) | |
386 | return -EFAULT; | |
387 | tv.tv_sec = old_tv.tv_sec; | |
388 | tv.tv_usec = old_tv.tv_usec; | |
fe0c72f3 AB |
389 | } else { |
390 | if (optlen < sizeof(tv)) | |
391 | return -EINVAL; | |
392 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
393 | return -EFAULT; | |
394 | } | |
ba78073e VA |
395 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
396 | return -EDOM; | |
1da177e4 | 397 | |
ba78073e | 398 | if (tv.tv_sec < 0) { |
6f11df83 AM |
399 | static int warned __read_mostly; |
400 | ||
ba78073e | 401 | *timeo_p = 0; |
50aab54f | 402 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 403 | warned++; |
e005d193 JP |
404 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
405 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 406 | } |
ba78073e VA |
407 | return 0; |
408 | } | |
1da177e4 LT |
409 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
410 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
411 | return 0; | |
a9beb86a DD |
412 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) |
413 | *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ); | |
1da177e4 LT |
414 | return 0; |
415 | } | |
416 | ||
417 | static void sock_warn_obsolete_bsdism(const char *name) | |
418 | { | |
419 | static int warned; | |
420 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
421 | if (strcmp(warncomm, current->comm) && warned < 5) { |
422 | strcpy(warncomm, current->comm); | |
e005d193 JP |
423 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
424 | warncomm, name); | |
1da177e4 LT |
425 | warned++; |
426 | } | |
427 | } | |
428 | ||
080a270f HFS |
429 | static bool sock_needs_netstamp(const struct sock *sk) |
430 | { | |
431 | switch (sk->sk_family) { | |
432 | case AF_UNSPEC: | |
433 | case AF_UNIX: | |
434 | return false; | |
435 | default: | |
436 | return true; | |
437 | } | |
438 | } | |
439 | ||
08e29af3 | 440 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
4ec93edb | 441 | { |
08e29af3 ED |
442 | if (sk->sk_flags & flags) { |
443 | sk->sk_flags &= ~flags; | |
080a270f HFS |
444 | if (sock_needs_netstamp(sk) && |
445 | !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 446 | net_disable_timestamp(); |
1da177e4 LT |
447 | } |
448 | } | |
449 | ||
450 | ||
e6afc8ac | 451 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f0088a50 | 452 | { |
3b885787 NH |
453 | unsigned long flags; |
454 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 455 | |
0fd7bac6 | 456 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 457 | atomic_inc(&sk->sk_drops); |
3847ce32 | 458 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 459 | return -ENOMEM; |
f0088a50 DV |
460 | } |
461 | ||
c76562b6 | 462 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
463 | atomic_inc(&sk->sk_drops); |
464 | return -ENOBUFS; | |
3ab224be HA |
465 | } |
466 | ||
f0088a50 DV |
467 | skb->dev = NULL; |
468 | skb_set_owner_r(skb, sk); | |
49ad9599 | 469 | |
7fee226a ED |
470 | /* we escape from rcu protected region, make sure we dont leak |
471 | * a norefcounted dst | |
472 | */ | |
473 | skb_dst_force(skb); | |
474 | ||
3b885787 | 475 | spin_lock_irqsave(&list->lock, flags); |
3bc3b96f | 476 | sock_skb_set_dropcount(sk, skb); |
3b885787 NH |
477 | __skb_queue_tail(list, skb); |
478 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
479 | |
480 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 481 | sk->sk_data_ready(sk); |
766e9037 | 482 | return 0; |
f0088a50 | 483 | } |
e6afc8ac | 484 | EXPORT_SYMBOL(__sock_queue_rcv_skb); |
485 | ||
486 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
487 | { | |
488 | int err; | |
489 | ||
490 | err = sk_filter(sk, skb); | |
491 | if (err) | |
492 | return err; | |
493 | ||
494 | return __sock_queue_rcv_skb(sk, skb); | |
495 | } | |
f0088a50 DV |
496 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
497 | ||
4f0c40d9 | 498 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
c3f24cfb | 499 | const int nested, unsigned int trim_cap, bool refcounted) |
f0088a50 DV |
500 | { |
501 | int rc = NET_RX_SUCCESS; | |
502 | ||
4f0c40d9 | 503 | if (sk_filter_trim_cap(sk, skb, trim_cap)) |
f0088a50 DV |
504 | goto discard_and_relse; |
505 | ||
506 | skb->dev = NULL; | |
507 | ||
274f482d | 508 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
c377411f ED |
509 | atomic_inc(&sk->sk_drops); |
510 | goto discard_and_relse; | |
511 | } | |
58a5a7b9 ACM |
512 | if (nested) |
513 | bh_lock_sock_nested(sk); | |
514 | else | |
515 | bh_lock_sock(sk); | |
a5b5bb9a IM |
516 | if (!sock_owned_by_user(sk)) { |
517 | /* | |
518 | * trylock + unlock semantics: | |
519 | */ | |
520 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
521 | ||
c57943a1 | 522 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
523 | |
524 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 525 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
526 | bh_unlock_sock(sk); |
527 | atomic_inc(&sk->sk_drops); | |
528 | goto discard_and_relse; | |
529 | } | |
530 | ||
f0088a50 DV |
531 | bh_unlock_sock(sk); |
532 | out: | |
c3f24cfb ED |
533 | if (refcounted) |
534 | sock_put(sk); | |
f0088a50 DV |
535 | return rc; |
536 | discard_and_relse: | |
537 | kfree_skb(skb); | |
538 | goto out; | |
539 | } | |
4f0c40d9 | 540 | EXPORT_SYMBOL(__sk_receive_skb); |
f0088a50 DV |
541 | |
542 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
543 | { | |
b6c6712a | 544 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
545 | |
546 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 547 | sk_tx_queue_clear(sk); |
9b8805a3 | 548 | sk->sk_dst_pending_confirm = 0; |
a9b3cd7f | 549 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
550 | dst_release(dst); |
551 | return NULL; | |
552 | } | |
553 | ||
554 | return dst; | |
555 | } | |
556 | EXPORT_SYMBOL(__sk_dst_check); | |
557 | ||
558 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
559 | { | |
560 | struct dst_entry *dst = sk_dst_get(sk); | |
561 | ||
562 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
563 | sk_dst_reset(sk); | |
564 | dst_release(dst); | |
565 | return NULL; | |
566 | } | |
567 | ||
568 | return dst; | |
569 | } | |
570 | EXPORT_SYMBOL(sk_dst_check); | |
571 | ||
f5dd3d0c | 572 | static int sock_setbindtodevice_locked(struct sock *sk, int ifindex) |
4878809f DM |
573 | { |
574 | int ret = -ENOPROTOOPT; | |
575 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 576 | struct net *net = sock_net(sk); |
4878809f DM |
577 | |
578 | /* Sorry... */ | |
579 | ret = -EPERM; | |
5e1fccc0 | 580 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
581 | goto out; |
582 | ||
f5dd3d0c DH |
583 | ret = -EINVAL; |
584 | if (ifindex < 0) | |
585 | goto out; | |
586 | ||
587 | sk->sk_bound_dev_if = ifindex; | |
588 | if (sk->sk_prot->rehash) | |
589 | sk->sk_prot->rehash(sk); | |
590 | sk_dst_reset(sk); | |
591 | ||
592 | ret = 0; | |
593 | ||
594 | out: | |
595 | #endif | |
596 | ||
597 | return ret; | |
598 | } | |
599 | ||
600 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, | |
601 | int optlen) | |
602 | { | |
603 | int ret = -ENOPROTOOPT; | |
604 | #ifdef CONFIG_NETDEVICES | |
605 | struct net *net = sock_net(sk); | |
606 | char devname[IFNAMSIZ]; | |
607 | int index; | |
608 | ||
4878809f DM |
609 | ret = -EINVAL; |
610 | if (optlen < 0) | |
611 | goto out; | |
612 | ||
613 | /* Bind this socket to a particular device like "eth0", | |
614 | * as specified in the passed interface name. If the | |
615 | * name is "" or the option length is zero the socket | |
616 | * is not bound. | |
617 | */ | |
618 | if (optlen > IFNAMSIZ - 1) | |
619 | optlen = IFNAMSIZ - 1; | |
620 | memset(devname, 0, sizeof(devname)); | |
621 | ||
622 | ret = -EFAULT; | |
623 | if (copy_from_user(devname, optval, optlen)) | |
624 | goto out; | |
625 | ||
000ba2e4 DM |
626 | index = 0; |
627 | if (devname[0] != '\0') { | |
bf8e56bf | 628 | struct net_device *dev; |
4878809f | 629 | |
bf8e56bf ED |
630 | rcu_read_lock(); |
631 | dev = dev_get_by_name_rcu(net, devname); | |
632 | if (dev) | |
633 | index = dev->ifindex; | |
634 | rcu_read_unlock(); | |
4878809f DM |
635 | ret = -ENODEV; |
636 | if (!dev) | |
637 | goto out; | |
4878809f DM |
638 | } |
639 | ||
640 | lock_sock(sk); | |
f5dd3d0c | 641 | ret = sock_setbindtodevice_locked(sk, index); |
4878809f DM |
642 | release_sock(sk); |
643 | ||
4878809f DM |
644 | out: |
645 | #endif | |
646 | ||
647 | return ret; | |
648 | } | |
649 | ||
c91f6df2 BH |
650 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
651 | int __user *optlen, int len) | |
652 | { | |
653 | int ret = -ENOPROTOOPT; | |
654 | #ifdef CONFIG_NETDEVICES | |
655 | struct net *net = sock_net(sk); | |
c91f6df2 | 656 | char devname[IFNAMSIZ]; |
c91f6df2 BH |
657 | |
658 | if (sk->sk_bound_dev_if == 0) { | |
659 | len = 0; | |
660 | goto zero; | |
661 | } | |
662 | ||
663 | ret = -EINVAL; | |
664 | if (len < IFNAMSIZ) | |
665 | goto out; | |
666 | ||
5dbe7c17 NS |
667 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
668 | if (ret) | |
c91f6df2 | 669 | goto out; |
c91f6df2 BH |
670 | |
671 | len = strlen(devname) + 1; | |
672 | ||
673 | ret = -EFAULT; | |
674 | if (copy_to_user(optval, devname, len)) | |
675 | goto out; | |
676 | ||
677 | zero: | |
678 | ret = -EFAULT; | |
679 | if (put_user(len, optlen)) | |
680 | goto out; | |
681 | ||
682 | ret = 0; | |
683 | ||
684 | out: | |
685 | #endif | |
686 | ||
687 | return ret; | |
688 | } | |
689 | ||
c0ef877b PE |
690 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
691 | { | |
692 | if (valbool) | |
693 | sock_set_flag(sk, bit); | |
694 | else | |
695 | sock_reset_flag(sk, bit); | |
696 | } | |
697 | ||
f60e5990 | 698 | bool sk_mc_loop(struct sock *sk) |
699 | { | |
700 | if (dev_recursion_level()) | |
701 | return false; | |
702 | if (!sk) | |
703 | return true; | |
704 | switch (sk->sk_family) { | |
705 | case AF_INET: | |
706 | return inet_sk(sk)->mc_loop; | |
707 | #if IS_ENABLED(CONFIG_IPV6) | |
708 | case AF_INET6: | |
709 | return inet6_sk(sk)->mc_loop; | |
710 | #endif | |
711 | } | |
712 | WARN_ON(1); | |
713 | return true; | |
714 | } | |
715 | EXPORT_SYMBOL(sk_mc_loop); | |
716 | ||
1da177e4 LT |
717 | /* |
718 | * This is meant for all protocols to use and covers goings on | |
719 | * at the socket level. Everything here is generic. | |
720 | */ | |
721 | ||
722 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 723 | char __user *optval, unsigned int optlen) |
1da177e4 | 724 | { |
80b14dee | 725 | struct sock_txtime sk_txtime; |
2a91525c | 726 | struct sock *sk = sock->sk; |
1da177e4 LT |
727 | int val; |
728 | int valbool; | |
729 | struct linger ling; | |
730 | int ret = 0; | |
4ec93edb | 731 | |
1da177e4 LT |
732 | /* |
733 | * Options without arguments | |
734 | */ | |
735 | ||
4878809f | 736 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 737 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 738 | |
e71a4783 SH |
739 | if (optlen < sizeof(int)) |
740 | return -EINVAL; | |
4ec93edb | 741 | |
1da177e4 LT |
742 | if (get_user(val, (int __user *)optval)) |
743 | return -EFAULT; | |
4ec93edb | 744 | |
2a91525c | 745 | valbool = val ? 1 : 0; |
1da177e4 LT |
746 | |
747 | lock_sock(sk); | |
748 | ||
2a91525c | 749 | switch (optname) { |
e71a4783 | 750 | case SO_DEBUG: |
2a91525c | 751 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 752 | ret = -EACCES; |
2a91525c | 753 | else |
c0ef877b | 754 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
755 | break; |
756 | case SO_REUSEADDR: | |
cdb8744d | 757 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 | 758 | break; |
055dc21a TH |
759 | case SO_REUSEPORT: |
760 | sk->sk_reuseport = valbool; | |
761 | break; | |
e71a4783 | 762 | case SO_TYPE: |
49c794e9 | 763 | case SO_PROTOCOL: |
0d6038ee | 764 | case SO_DOMAIN: |
e71a4783 SH |
765 | case SO_ERROR: |
766 | ret = -ENOPROTOOPT; | |
767 | break; | |
768 | case SO_DONTROUTE: | |
c0ef877b | 769 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
0fbe82e6 | 770 | sk_dst_reset(sk); |
e71a4783 SH |
771 | break; |
772 | case SO_BROADCAST: | |
773 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
774 | break; | |
775 | case SO_SNDBUF: | |
776 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
777 | * about it this is right. Otherwise apps have to |
778 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
779 | * are treated in BSD as hints | |
780 | */ | |
781 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 782 | set_sndbuf: |
4057765f GN |
783 | /* Ensure val * 2 fits into an int, to prevent max_t() |
784 | * from treating it as a negative value. | |
785 | */ | |
786 | val = min_t(int, val, INT_MAX / 2); | |
e71a4783 | 787 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
b98b0bc8 | 788 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); |
82981930 | 789 | /* Wake up sending tasks if we upped the value. */ |
e71a4783 SH |
790 | sk->sk_write_space(sk); |
791 | break; | |
1da177e4 | 792 | |
e71a4783 SH |
793 | case SO_SNDBUFFORCE: |
794 | if (!capable(CAP_NET_ADMIN)) { | |
795 | ret = -EPERM; | |
796 | break; | |
797 | } | |
4057765f GN |
798 | |
799 | /* No negative values (to prevent underflow, as val will be | |
800 | * multiplied by 2). | |
801 | */ | |
802 | if (val < 0) | |
803 | val = 0; | |
e71a4783 | 804 | goto set_sndbuf; |
b0573dea | 805 | |
e71a4783 SH |
806 | case SO_RCVBUF: |
807 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
808 | * about it this is right. Otherwise apps have to |
809 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
810 | * are treated in BSD as hints | |
811 | */ | |
812 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 813 | set_rcvbuf: |
4057765f GN |
814 | /* Ensure val * 2 fits into an int, to prevent max_t() |
815 | * from treating it as a negative value. | |
816 | */ | |
817 | val = min_t(int, val, INT_MAX / 2); | |
e71a4783 SH |
818 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
819 | /* | |
820 | * We double it on the way in to account for | |
821 | * "struct sk_buff" etc. overhead. Applications | |
822 | * assume that the SO_RCVBUF setting they make will | |
823 | * allow that much actual data to be received on that | |
824 | * socket. | |
825 | * | |
826 | * Applications are unaware that "struct sk_buff" and | |
827 | * other overheads allocate from the receive buffer | |
828 | * during socket buffer allocation. | |
829 | * | |
830 | * And after considering the possible alternatives, | |
831 | * returning the value we actually used in getsockopt | |
832 | * is the most desirable behavior. | |
833 | */ | |
b98b0bc8 | 834 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
835 | break; |
836 | ||
837 | case SO_RCVBUFFORCE: | |
838 | if (!capable(CAP_NET_ADMIN)) { | |
839 | ret = -EPERM; | |
1da177e4 | 840 | break; |
e71a4783 | 841 | } |
4057765f GN |
842 | |
843 | /* No negative values (to prevent underflow, as val will be | |
844 | * multiplied by 2). | |
845 | */ | |
846 | if (val < 0) | |
847 | val = 0; | |
e71a4783 | 848 | goto set_rcvbuf; |
1da177e4 | 849 | |
e71a4783 | 850 | case SO_KEEPALIVE: |
4b9d07a4 UB |
851 | if (sk->sk_prot->keepalive) |
852 | sk->sk_prot->keepalive(sk, valbool); | |
e71a4783 SH |
853 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
854 | break; | |
855 | ||
856 | case SO_OOBINLINE: | |
857 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
858 | break; | |
859 | ||
860 | case SO_NO_CHECK: | |
28448b80 | 861 | sk->sk_no_check_tx = valbool; |
e71a4783 SH |
862 | break; |
863 | ||
864 | case SO_PRIORITY: | |
5e1fccc0 EB |
865 | if ((val >= 0 && val <= 6) || |
866 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
867 | sk->sk_priority = val; |
868 | else | |
869 | ret = -EPERM; | |
870 | break; | |
871 | ||
872 | case SO_LINGER: | |
873 | if (optlen < sizeof(ling)) { | |
874 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 875 | break; |
e71a4783 | 876 | } |
2a91525c | 877 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 878 | ret = -EFAULT; |
1da177e4 | 879 | break; |
e71a4783 SH |
880 | } |
881 | if (!ling.l_onoff) | |
882 | sock_reset_flag(sk, SOCK_LINGER); | |
883 | else { | |
1da177e4 | 884 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
885 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
886 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 887 | else |
e71a4783 SH |
888 | #endif |
889 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
890 | sock_set_flag(sk, SOCK_LINGER); | |
891 | } | |
892 | break; | |
893 | ||
894 | case SO_BSDCOMPAT: | |
895 | sock_warn_obsolete_bsdism("setsockopt"); | |
896 | break; | |
897 | ||
898 | case SO_PASSCRED: | |
899 | if (valbool) | |
900 | set_bit(SOCK_PASSCRED, &sock->flags); | |
901 | else | |
902 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
903 | break; | |
904 | ||
7f1bc6e9 | 905 | case SO_TIMESTAMP_OLD: |
887feae3 | 906 | case SO_TIMESTAMP_NEW: |
7f1bc6e9 | 907 | case SO_TIMESTAMPNS_OLD: |
887feae3 | 908 | case SO_TIMESTAMPNS_NEW: |
e71a4783 | 909 | if (valbool) { |
887feae3 DD |
910 | if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW) |
911 | sock_set_flag(sk, SOCK_TSTAMP_NEW); | |
912 | else | |
913 | sock_reset_flag(sk, SOCK_TSTAMP_NEW); | |
914 | ||
915 | if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW) | |
92f37fd2 ED |
916 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
917 | else | |
918 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 919 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 920 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 921 | } else { |
e71a4783 | 922 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 | 923 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
887feae3 | 924 | sock_reset_flag(sk, SOCK_TSTAMP_NEW); |
92f37fd2 | 925 | } |
e71a4783 SH |
926 | break; |
927 | ||
9718475e DD |
928 | case SO_TIMESTAMPING_NEW: |
929 | sock_set_flag(sk, SOCK_TSTAMP_NEW); | |
ff7653f9 | 930 | /* fall through */ |
7f1bc6e9 | 931 | case SO_TIMESTAMPING_OLD: |
20d49473 | 932 | if (val & ~SOF_TIMESTAMPING_MASK) { |
f249fb78 | 933 | ret = -EINVAL; |
20d49473 PO |
934 | break; |
935 | } | |
b245be1f | 936 | |
09c2d251 | 937 | if (val & SOF_TIMESTAMPING_OPT_ID && |
4ed2d765 | 938 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
ac5cc977 WC |
939 | if (sk->sk_protocol == IPPROTO_TCP && |
940 | sk->sk_type == SOCK_STREAM) { | |
6db8b963 SHY |
941 | if ((1 << sk->sk_state) & |
942 | (TCPF_CLOSE | TCPF_LISTEN)) { | |
4ed2d765 WB |
943 | ret = -EINVAL; |
944 | break; | |
945 | } | |
946 | sk->sk_tskey = tcp_sk(sk)->snd_una; | |
947 | } else { | |
948 | sk->sk_tskey = 0; | |
949 | } | |
950 | } | |
1c885808 FY |
951 | |
952 | if (val & SOF_TIMESTAMPING_OPT_STATS && | |
953 | !(val & SOF_TIMESTAMPING_OPT_TSONLY)) { | |
954 | ret = -EINVAL; | |
955 | break; | |
956 | } | |
957 | ||
b9f40e21 | 958 | sk->sk_tsflags = val; |
20d49473 PO |
959 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
960 | sock_enable_timestamp(sk, | |
961 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
9718475e DD |
962 | else { |
963 | if (optname == SO_TIMESTAMPING_NEW) | |
964 | sock_reset_flag(sk, SOCK_TSTAMP_NEW); | |
965 | ||
20d49473 | 966 | sock_disable_timestamp(sk, |
08e29af3 | 967 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
9718475e | 968 | } |
20d49473 PO |
969 | break; |
970 | ||
e71a4783 SH |
971 | case SO_RCVLOWAT: |
972 | if (val < 0) | |
973 | val = INT_MAX; | |
d1361840 ED |
974 | if (sock->ops->set_rcvlowat) |
975 | ret = sock->ops->set_rcvlowat(sk, val); | |
976 | else | |
977 | sk->sk_rcvlowat = val ? : 1; | |
e71a4783 SH |
978 | break; |
979 | ||
45bdc661 | 980 | case SO_RCVTIMEO_OLD: |
a9beb86a DD |
981 | case SO_RCVTIMEO_NEW: |
982 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD); | |
e71a4783 SH |
983 | break; |
984 | ||
45bdc661 | 985 | case SO_SNDTIMEO_OLD: |
a9beb86a DD |
986 | case SO_SNDTIMEO_NEW: |
987 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD); | |
e71a4783 | 988 | break; |
1da177e4 | 989 | |
e71a4783 SH |
990 | case SO_ATTACH_FILTER: |
991 | ret = -EINVAL; | |
992 | if (optlen == sizeof(struct sock_fprog)) { | |
993 | struct sock_fprog fprog; | |
1da177e4 | 994 | |
e71a4783 SH |
995 | ret = -EFAULT; |
996 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 997 | break; |
e71a4783 SH |
998 | |
999 | ret = sk_attach_filter(&fprog, sk); | |
1000 | } | |
1001 | break; | |
1002 | ||
89aa0758 AS |
1003 | case SO_ATTACH_BPF: |
1004 | ret = -EINVAL; | |
1005 | if (optlen == sizeof(u32)) { | |
1006 | u32 ufd; | |
1007 | ||
1008 | ret = -EFAULT; | |
1009 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
1010 | break; | |
1011 | ||
1012 | ret = sk_attach_bpf(ufd, sk); | |
1013 | } | |
1014 | break; | |
1015 | ||
538950a1 CG |
1016 | case SO_ATTACH_REUSEPORT_CBPF: |
1017 | ret = -EINVAL; | |
1018 | if (optlen == sizeof(struct sock_fprog)) { | |
1019 | struct sock_fprog fprog; | |
1020 | ||
1021 | ret = -EFAULT; | |
1022 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1023 | break; | |
1024 | ||
1025 | ret = sk_reuseport_attach_filter(&fprog, sk); | |
1026 | } | |
1027 | break; | |
1028 | ||
1029 | case SO_ATTACH_REUSEPORT_EBPF: | |
1030 | ret = -EINVAL; | |
1031 | if (optlen == sizeof(u32)) { | |
1032 | u32 ufd; | |
1033 | ||
1034 | ret = -EFAULT; | |
1035 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
1036 | break; | |
1037 | ||
1038 | ret = sk_reuseport_attach_bpf(ufd, sk); | |
1039 | } | |
1040 | break; | |
1041 | ||
e71a4783 | 1042 | case SO_DETACH_FILTER: |
55b33325 | 1043 | ret = sk_detach_filter(sk); |
e71a4783 | 1044 | break; |
1da177e4 | 1045 | |
d59577b6 VB |
1046 | case SO_LOCK_FILTER: |
1047 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) | |
1048 | ret = -EPERM; | |
1049 | else | |
1050 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); | |
1051 | break; | |
1052 | ||
e71a4783 SH |
1053 | case SO_PASSSEC: |
1054 | if (valbool) | |
1055 | set_bit(SOCK_PASSSEC, &sock->flags); | |
1056 | else | |
1057 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
1058 | break; | |
4a19ec58 | 1059 | case SO_MARK: |
50254256 | 1060 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { |
4a19ec58 | 1061 | ret = -EPERM; |
50254256 | 1062 | } else if (val != sk->sk_mark) { |
4a19ec58 | 1063 | sk->sk_mark = val; |
50254256 DB |
1064 | sk_dst_reset(sk); |
1065 | } | |
4a19ec58 | 1066 | break; |
877ce7c1 | 1067 | |
3b885787 | 1068 | case SO_RXQ_OVFL: |
8083f0fc | 1069 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 1070 | break; |
6e3e939f JB |
1071 | |
1072 | case SO_WIFI_STATUS: | |
1073 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
1074 | break; | |
1075 | ||
ef64a54f PE |
1076 | case SO_PEEK_OFF: |
1077 | if (sock->ops->set_peek_off) | |
12663bfc | 1078 | ret = sock->ops->set_peek_off(sk, val); |
ef64a54f PE |
1079 | else |
1080 | ret = -EOPNOTSUPP; | |
1081 | break; | |
3bdc0eba BG |
1082 | |
1083 | case SO_NOFCS: | |
1084 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
1085 | break; | |
1086 | ||
7d4c04fc KJ |
1087 | case SO_SELECT_ERR_QUEUE: |
1088 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); | |
1089 | break; | |
1090 | ||
e0d1095a | 1091 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1092 | case SO_BUSY_POLL: |
dafcc438 ET |
1093 | /* allow unprivileged users to decrease the value */ |
1094 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) | |
1095 | ret = -EPERM; | |
1096 | else { | |
1097 | if (val < 0) | |
1098 | ret = -EINVAL; | |
1099 | else | |
1100 | sk->sk_ll_usec = val; | |
1101 | } | |
1102 | break; | |
1103 | #endif | |
62748f32 ED |
1104 | |
1105 | case SO_MAX_PACING_RATE: | |
6bdef102 ED |
1106 | { |
1107 | unsigned long ulval = (val == ~0U) ? ~0UL : val; | |
1108 | ||
1109 | if (sizeof(ulval) != sizeof(val) && | |
1110 | optlen >= sizeof(ulval) && | |
1111 | get_user(ulval, (unsigned long __user *)optval)) { | |
1112 | ret = -EFAULT; | |
1113 | break; | |
1114 | } | |
1115 | if (ulval != ~0UL) | |
218af599 ED |
1116 | cmpxchg(&sk->sk_pacing_status, |
1117 | SK_PACING_NONE, | |
1118 | SK_PACING_NEEDED); | |
6bdef102 ED |
1119 | sk->sk_max_pacing_rate = ulval; |
1120 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval); | |
62748f32 | 1121 | break; |
6bdef102 | 1122 | } |
70da268b ED |
1123 | case SO_INCOMING_CPU: |
1124 | sk->sk_incoming_cpu = val; | |
1125 | break; | |
1126 | ||
a87cb3e4 TH |
1127 | case SO_CNX_ADVICE: |
1128 | if (val == 1) | |
1129 | dst_negative_advice(sk); | |
1130 | break; | |
76851d12 WB |
1131 | |
1132 | case SO_ZEROCOPY: | |
28190752 | 1133 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) { |
b5947e5d WB |
1134 | if (!((sk->sk_type == SOCK_STREAM && |
1135 | sk->sk_protocol == IPPROTO_TCP) || | |
1136 | (sk->sk_type == SOCK_DGRAM && | |
1137 | sk->sk_protocol == IPPROTO_UDP))) | |
28190752 | 1138 | ret = -ENOTSUPP; |
28190752 | 1139 | } else if (sk->sk_family != PF_RDS) { |
76851d12 | 1140 | ret = -ENOTSUPP; |
28190752 SV |
1141 | } |
1142 | if (!ret) { | |
1143 | if (val < 0 || val > 1) | |
1144 | ret = -EINVAL; | |
1145 | else | |
1146 | sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool); | |
28190752 | 1147 | } |
334e6413 JSP |
1148 | break; |
1149 | ||
80b14dee RC |
1150 | case SO_TXTIME: |
1151 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
1152 | ret = -EPERM; | |
1153 | } else if (optlen != sizeof(struct sock_txtime)) { | |
1154 | ret = -EINVAL; | |
1155 | } else if (copy_from_user(&sk_txtime, optval, | |
1156 | sizeof(struct sock_txtime))) { | |
1157 | ret = -EFAULT; | |
1158 | } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) { | |
1159 | ret = -EINVAL; | |
1160 | } else { | |
1161 | sock_valbool_flag(sk, SOCK_TXTIME, true); | |
1162 | sk->sk_clockid = sk_txtime.clockid; | |
1163 | sk->sk_txtime_deadline_mode = | |
1164 | !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE); | |
4b15c707 JSP |
1165 | sk->sk_txtime_report_errors = |
1166 | !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS); | |
80b14dee RC |
1167 | } |
1168 | break; | |
1169 | ||
f5dd3d0c DH |
1170 | case SO_BINDTOIFINDEX: |
1171 | ret = sock_setbindtodevice_locked(sk, val); | |
1172 | break; | |
1173 | ||
e71a4783 SH |
1174 | default: |
1175 | ret = -ENOPROTOOPT; | |
1176 | break; | |
4ec93edb | 1177 | } |
1da177e4 LT |
1178 | release_sock(sk); |
1179 | return ret; | |
1180 | } | |
2a91525c | 1181 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
1182 | |
1183 | ||
8f09898b | 1184 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
1185 | struct ucred *ucred) | |
3f551f94 EB |
1186 | { |
1187 | ucred->pid = pid_vnr(pid); | |
1188 | ucred->uid = ucred->gid = -1; | |
1189 | if (cred) { | |
1190 | struct user_namespace *current_ns = current_user_ns(); | |
1191 | ||
b2e4f544 EB |
1192 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
1193 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
1194 | } |
1195 | } | |
1196 | ||
28b5ba2a DH |
1197 | static int groups_to_user(gid_t __user *dst, const struct group_info *src) |
1198 | { | |
1199 | struct user_namespace *user_ns = current_user_ns(); | |
1200 | int i; | |
1201 | ||
1202 | for (i = 0; i < src->ngroups; i++) | |
1203 | if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i)) | |
1204 | return -EFAULT; | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
1da177e4 LT |
1209 | int sock_getsockopt(struct socket *sock, int level, int optname, |
1210 | char __user *optval, int __user *optlen) | |
1211 | { | |
1212 | struct sock *sk = sock->sk; | |
4ec93edb | 1213 | |
e71a4783 | 1214 | union { |
4ec93edb | 1215 | int val; |
5daab9db | 1216 | u64 val64; |
677f136c | 1217 | unsigned long ulval; |
4ec93edb | 1218 | struct linger ling; |
fe0c72f3 AB |
1219 | struct old_timeval32 tm32; |
1220 | struct __kernel_old_timeval tm; | |
a9beb86a | 1221 | struct __kernel_sock_timeval stm; |
80b14dee | 1222 | struct sock_txtime txtime; |
1da177e4 | 1223 | } v; |
4ec93edb | 1224 | |
4d0392be | 1225 | int lv = sizeof(int); |
1da177e4 | 1226 | int len; |
4ec93edb | 1227 | |
e71a4783 | 1228 | if (get_user(len, optlen)) |
4ec93edb | 1229 | return -EFAULT; |
e71a4783 | 1230 | if (len < 0) |
1da177e4 | 1231 | return -EINVAL; |
4ec93edb | 1232 | |
50fee1de | 1233 | memset(&v, 0, sizeof(v)); |
df0bca04 | 1234 | |
2a91525c | 1235 | switch (optname) { |
e71a4783 SH |
1236 | case SO_DEBUG: |
1237 | v.val = sock_flag(sk, SOCK_DBG); | |
1238 | break; | |
1239 | ||
1240 | case SO_DONTROUTE: | |
1241 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
1242 | break; | |
1243 | ||
1244 | case SO_BROADCAST: | |
1b23a5df | 1245 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
1246 | break; |
1247 | ||
1248 | case SO_SNDBUF: | |
1249 | v.val = sk->sk_sndbuf; | |
1250 | break; | |
1251 | ||
1252 | case SO_RCVBUF: | |
1253 | v.val = sk->sk_rcvbuf; | |
1254 | break; | |
1255 | ||
1256 | case SO_REUSEADDR: | |
1257 | v.val = sk->sk_reuse; | |
1258 | break; | |
1259 | ||
055dc21a TH |
1260 | case SO_REUSEPORT: |
1261 | v.val = sk->sk_reuseport; | |
1262 | break; | |
1263 | ||
e71a4783 | 1264 | case SO_KEEPALIVE: |
1b23a5df | 1265 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
1266 | break; |
1267 | ||
1268 | case SO_TYPE: | |
1269 | v.val = sk->sk_type; | |
1270 | break; | |
1271 | ||
49c794e9 JE |
1272 | case SO_PROTOCOL: |
1273 | v.val = sk->sk_protocol; | |
1274 | break; | |
1275 | ||
0d6038ee JE |
1276 | case SO_DOMAIN: |
1277 | v.val = sk->sk_family; | |
1278 | break; | |
1279 | ||
e71a4783 SH |
1280 | case SO_ERROR: |
1281 | v.val = -sock_error(sk); | |
2a91525c | 1282 | if (v.val == 0) |
e71a4783 SH |
1283 | v.val = xchg(&sk->sk_err_soft, 0); |
1284 | break; | |
1285 | ||
1286 | case SO_OOBINLINE: | |
1b23a5df | 1287 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
1288 | break; |
1289 | ||
1290 | case SO_NO_CHECK: | |
28448b80 | 1291 | v.val = sk->sk_no_check_tx; |
e71a4783 SH |
1292 | break; |
1293 | ||
1294 | case SO_PRIORITY: | |
1295 | v.val = sk->sk_priority; | |
1296 | break; | |
1297 | ||
1298 | case SO_LINGER: | |
1299 | lv = sizeof(v.ling); | |
1b23a5df | 1300 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1301 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1302 | break; | |
1303 | ||
1304 | case SO_BSDCOMPAT: | |
1305 | sock_warn_obsolete_bsdism("getsockopt"); | |
1306 | break; | |
1307 | ||
7f1bc6e9 | 1308 | case SO_TIMESTAMP_OLD: |
92f37fd2 | 1309 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
887feae3 | 1310 | !sock_flag(sk, SOCK_TSTAMP_NEW) && |
92f37fd2 ED |
1311 | !sock_flag(sk, SOCK_RCVTSTAMPNS); |
1312 | break; | |
1313 | ||
7f1bc6e9 | 1314 | case SO_TIMESTAMPNS_OLD: |
887feae3 DD |
1315 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW); |
1316 | break; | |
1317 | ||
1318 | case SO_TIMESTAMP_NEW: | |
1319 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW); | |
1320 | break; | |
1321 | ||
1322 | case SO_TIMESTAMPNS_NEW: | |
1323 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW); | |
e71a4783 SH |
1324 | break; |
1325 | ||
7f1bc6e9 | 1326 | case SO_TIMESTAMPING_OLD: |
b9f40e21 | 1327 | v.val = sk->sk_tsflags; |
20d49473 PO |
1328 | break; |
1329 | ||
a9beb86a DD |
1330 | case SO_RCVTIMEO_OLD: |
1331 | case SO_RCVTIMEO_NEW: | |
1332 | lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname); | |
e71a4783 SH |
1333 | break; |
1334 | ||
a9beb86a DD |
1335 | case SO_SNDTIMEO_OLD: |
1336 | case SO_SNDTIMEO_NEW: | |
1337 | lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname); | |
e71a4783 | 1338 | break; |
1da177e4 | 1339 | |
e71a4783 SH |
1340 | case SO_RCVLOWAT: |
1341 | v.val = sk->sk_rcvlowat; | |
1342 | break; | |
1da177e4 | 1343 | |
e71a4783 | 1344 | case SO_SNDLOWAT: |
2a91525c | 1345 | v.val = 1; |
e71a4783 | 1346 | break; |
1da177e4 | 1347 | |
e71a4783 | 1348 | case SO_PASSCRED: |
82981930 | 1349 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1350 | break; |
1da177e4 | 1351 | |
e71a4783 | 1352 | case SO_PEERCRED: |
109f6e39 EB |
1353 | { |
1354 | struct ucred peercred; | |
1355 | if (len > sizeof(peercred)) | |
1356 | len = sizeof(peercred); | |
1357 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1358 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1359 | return -EFAULT; |
1360 | goto lenout; | |
109f6e39 | 1361 | } |
1da177e4 | 1362 | |
28b5ba2a DH |
1363 | case SO_PEERGROUPS: |
1364 | { | |
1365 | int ret, n; | |
1366 | ||
1367 | if (!sk->sk_peer_cred) | |
1368 | return -ENODATA; | |
1369 | ||
1370 | n = sk->sk_peer_cred->group_info->ngroups; | |
1371 | if (len < n * sizeof(gid_t)) { | |
1372 | len = n * sizeof(gid_t); | |
1373 | return put_user(len, optlen) ? -EFAULT : -ERANGE; | |
1374 | } | |
1375 | len = n * sizeof(gid_t); | |
1376 | ||
1377 | ret = groups_to_user((gid_t __user *)optval, | |
1378 | sk->sk_peer_cred->group_info); | |
1379 | if (ret) | |
1380 | return ret; | |
1381 | goto lenout; | |
1382 | } | |
1383 | ||
e71a4783 SH |
1384 | case SO_PEERNAME: |
1385 | { | |
1386 | char address[128]; | |
1387 | ||
9b2c45d4 DV |
1388 | lv = sock->ops->getname(sock, (struct sockaddr *)address, 2); |
1389 | if (lv < 0) | |
e71a4783 SH |
1390 | return -ENOTCONN; |
1391 | if (lv < len) | |
1392 | return -EINVAL; | |
1393 | if (copy_to_user(optval, address, len)) | |
1394 | return -EFAULT; | |
1395 | goto lenout; | |
1396 | } | |
1da177e4 | 1397 | |
e71a4783 SH |
1398 | /* Dubious BSD thing... Probably nobody even uses it, but |
1399 | * the UNIX standard wants it for whatever reason... -DaveM | |
1400 | */ | |
1401 | case SO_ACCEPTCONN: | |
1402 | v.val = sk->sk_state == TCP_LISTEN; | |
1403 | break; | |
1da177e4 | 1404 | |
e71a4783 | 1405 | case SO_PASSSEC: |
82981930 | 1406 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1407 | break; |
877ce7c1 | 1408 | |
e71a4783 SH |
1409 | case SO_PEERSEC: |
1410 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1411 | |
4a19ec58 LAT |
1412 | case SO_MARK: |
1413 | v.val = sk->sk_mark; | |
1414 | break; | |
1415 | ||
3b885787 | 1416 | case SO_RXQ_OVFL: |
1b23a5df | 1417 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1418 | break; |
1419 | ||
6e3e939f | 1420 | case SO_WIFI_STATUS: |
1b23a5df | 1421 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1422 | break; |
1423 | ||
ef64a54f PE |
1424 | case SO_PEEK_OFF: |
1425 | if (!sock->ops->set_peek_off) | |
1426 | return -EOPNOTSUPP; | |
1427 | ||
1428 | v.val = sk->sk_peek_off; | |
1429 | break; | |
bc2f7996 | 1430 | case SO_NOFCS: |
1b23a5df | 1431 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1432 | break; |
c91f6df2 | 1433 | |
f7b86bfe | 1434 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1435 | return sock_getbindtodevice(sk, optval, optlen, len); |
1436 | ||
a8fc9277 PE |
1437 | case SO_GET_FILTER: |
1438 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1439 | if (len < 0) | |
1440 | return len; | |
1441 | ||
1442 | goto lenout; | |
c91f6df2 | 1443 | |
d59577b6 VB |
1444 | case SO_LOCK_FILTER: |
1445 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); | |
1446 | break; | |
1447 | ||
ea02f941 MS |
1448 | case SO_BPF_EXTENSIONS: |
1449 | v.val = bpf_tell_extensions(); | |
1450 | break; | |
1451 | ||
7d4c04fc KJ |
1452 | case SO_SELECT_ERR_QUEUE: |
1453 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); | |
1454 | break; | |
1455 | ||
e0d1095a | 1456 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1457 | case SO_BUSY_POLL: |
dafcc438 ET |
1458 | v.val = sk->sk_ll_usec; |
1459 | break; | |
1460 | #endif | |
1461 | ||
62748f32 | 1462 | case SO_MAX_PACING_RATE: |
677f136c ED |
1463 | if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) { |
1464 | lv = sizeof(v.ulval); | |
1465 | v.ulval = sk->sk_max_pacing_rate; | |
1466 | } else { | |
1467 | /* 32bit version */ | |
1468 | v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U); | |
1469 | } | |
62748f32 ED |
1470 | break; |
1471 | ||
2c8c56e1 ED |
1472 | case SO_INCOMING_CPU: |
1473 | v.val = sk->sk_incoming_cpu; | |
1474 | break; | |
1475 | ||
a2d133b1 JH |
1476 | case SO_MEMINFO: |
1477 | { | |
1478 | u32 meminfo[SK_MEMINFO_VARS]; | |
1479 | ||
a2d133b1 JH |
1480 | sk_get_meminfo(sk, meminfo); |
1481 | ||
1482 | len = min_t(unsigned int, len, sizeof(meminfo)); | |
1483 | if (copy_to_user(optval, &meminfo, len)) | |
1484 | return -EFAULT; | |
1485 | ||
1486 | goto lenout; | |
1487 | } | |
6d433902 SS |
1488 | |
1489 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
1490 | case SO_INCOMING_NAPI_ID: | |
1491 | v.val = READ_ONCE(sk->sk_napi_id); | |
1492 | ||
1493 | /* aggregate non-NAPI IDs down to 0 */ | |
1494 | if (v.val < MIN_NAPI_ID) | |
1495 | v.val = 0; | |
1496 | ||
1497 | break; | |
1498 | #endif | |
1499 | ||
5daab9db CF |
1500 | case SO_COOKIE: |
1501 | lv = sizeof(u64); | |
1502 | if (len < lv) | |
1503 | return -EINVAL; | |
1504 | v.val64 = sock_gen_cookie(sk); | |
1505 | break; | |
1506 | ||
76851d12 WB |
1507 | case SO_ZEROCOPY: |
1508 | v.val = sock_flag(sk, SOCK_ZEROCOPY); | |
1509 | break; | |
1510 | ||
80b14dee RC |
1511 | case SO_TXTIME: |
1512 | lv = sizeof(v.txtime); | |
1513 | v.txtime.clockid = sk->sk_clockid; | |
1514 | v.txtime.flags |= sk->sk_txtime_deadline_mode ? | |
1515 | SOF_TXTIME_DEADLINE_MODE : 0; | |
4b15c707 JSP |
1516 | v.txtime.flags |= sk->sk_txtime_report_errors ? |
1517 | SOF_TXTIME_REPORT_ERRORS : 0; | |
80b14dee RC |
1518 | break; |
1519 | ||
f5dd3d0c DH |
1520 | case SO_BINDTOIFINDEX: |
1521 | v.val = sk->sk_bound_dev_if; | |
1522 | break; | |
1523 | ||
e71a4783 | 1524 | default: |
443b5991 YH |
1525 | /* We implement the SO_SNDLOWAT etc to not be settable |
1526 | * (1003.1g 7). | |
1527 | */ | |
e71a4783 | 1528 | return -ENOPROTOOPT; |
1da177e4 | 1529 | } |
e71a4783 | 1530 | |
1da177e4 LT |
1531 | if (len > lv) |
1532 | len = lv; | |
1533 | if (copy_to_user(optval, &v, len)) | |
1534 | return -EFAULT; | |
1535 | lenout: | |
4ec93edb YH |
1536 | if (put_user(len, optlen)) |
1537 | return -EFAULT; | |
1538 | return 0; | |
1da177e4 LT |
1539 | } |
1540 | ||
a5b5bb9a IM |
1541 | /* |
1542 | * Initialize an sk_lock. | |
1543 | * | |
1544 | * (We also register the sk_lock with the lock validator.) | |
1545 | */ | |
b6f99a21 | 1546 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1547 | { |
cdfbabfb DH |
1548 | if (sk->sk_kern_sock) |
1549 | sock_lock_init_class_and_name( | |
1550 | sk, | |
1551 | af_family_kern_slock_key_strings[sk->sk_family], | |
1552 | af_family_kern_slock_keys + sk->sk_family, | |
1553 | af_family_kern_key_strings[sk->sk_family], | |
1554 | af_family_kern_keys + sk->sk_family); | |
1555 | else | |
1556 | sock_lock_init_class_and_name( | |
1557 | sk, | |
ed07536e PZ |
1558 | af_family_slock_key_strings[sk->sk_family], |
1559 | af_family_slock_keys + sk->sk_family, | |
1560 | af_family_key_strings[sk->sk_family], | |
1561 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1562 | } |
1563 | ||
4dc6dc71 ED |
1564 | /* |
1565 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1566 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1567 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1568 | */ |
f1a6c4da PE |
1569 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1570 | { | |
1571 | #ifdef CONFIG_SECURITY_NETWORK | |
1572 | void *sptr = nsk->sk_security; | |
1573 | #endif | |
68835aba ED |
1574 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1575 | ||
1576 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1577 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1578 | ||
f1a6c4da PE |
1579 | #ifdef CONFIG_SECURITY_NETWORK |
1580 | nsk->sk_security = sptr; | |
1581 | security_sk_clone(osk, nsk); | |
1582 | #endif | |
1583 | } | |
1584 | ||
2e4afe7b PE |
1585 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1586 | int family) | |
c308c1b2 PE |
1587 | { |
1588 | struct sock *sk; | |
1589 | struct kmem_cache *slab; | |
1590 | ||
1591 | slab = prot->slab; | |
e912b114 ED |
1592 | if (slab != NULL) { |
1593 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1594 | if (!sk) | |
1595 | return sk; | |
ba2489b0 ED |
1596 | if (priority & __GFP_ZERO) |
1597 | sk_prot_clear_nulls(sk, prot->obj_size); | |
fcbdf09d | 1598 | } else |
c308c1b2 PE |
1599 | sk = kmalloc(prot->obj_size, priority); |
1600 | ||
2e4afe7b PE |
1601 | if (sk != NULL) { |
1602 | if (security_sk_alloc(sk, family, priority)) | |
1603 | goto out_free; | |
1604 | ||
1605 | if (!try_module_get(prot->owner)) | |
1606 | goto out_free_sec; | |
e022f0b4 | 1607 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1608 | } |
1609 | ||
c308c1b2 | 1610 | return sk; |
2e4afe7b PE |
1611 | |
1612 | out_free_sec: | |
1613 | security_sk_free(sk); | |
1614 | out_free: | |
1615 | if (slab != NULL) | |
1616 | kmem_cache_free(slab, sk); | |
1617 | else | |
1618 | kfree(sk); | |
1619 | return NULL; | |
c308c1b2 PE |
1620 | } |
1621 | ||
1622 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1623 | { | |
1624 | struct kmem_cache *slab; | |
2e4afe7b | 1625 | struct module *owner; |
c308c1b2 | 1626 | |
2e4afe7b | 1627 | owner = prot->owner; |
c308c1b2 | 1628 | slab = prot->slab; |
2e4afe7b | 1629 | |
bd1060a1 | 1630 | cgroup_sk_free(&sk->sk_cgrp_data); |
2d758073 | 1631 | mem_cgroup_sk_free(sk); |
2e4afe7b | 1632 | security_sk_free(sk); |
c308c1b2 PE |
1633 | if (slab != NULL) |
1634 | kmem_cache_free(slab, sk); | |
1635 | else | |
1636 | kfree(sk); | |
2e4afe7b | 1637 | module_put(owner); |
c308c1b2 PE |
1638 | } |
1639 | ||
1da177e4 LT |
1640 | /** |
1641 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1642 | * @net: the applicable net namespace |
4dc3b16b PP |
1643 | * @family: protocol family |
1644 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1645 | * @prot: struct proto associated with this new sock instance | |
11aa9c28 | 1646 | * @kern: is this to be a kernel socket? |
1da177e4 | 1647 | */ |
1b8d7ae4 | 1648 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1649 | struct proto *prot, int kern) |
1da177e4 | 1650 | { |
c308c1b2 | 1651 | struct sock *sk; |
1da177e4 | 1652 | |
154adbc8 | 1653 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1654 | if (sk) { |
154adbc8 PE |
1655 | sk->sk_family = family; |
1656 | /* | |
1657 | * See comment in struct sock definition to understand | |
1658 | * why we need sk_prot_creator -acme | |
1659 | */ | |
1660 | sk->sk_prot = sk->sk_prot_creator = prot; | |
cdfbabfb | 1661 | sk->sk_kern_sock = kern; |
154adbc8 | 1662 | sock_lock_init(sk); |
26abe143 | 1663 | sk->sk_net_refcnt = kern ? 0 : 1; |
648845ab | 1664 | if (likely(sk->sk_net_refcnt)) { |
26abe143 | 1665 | get_net(net); |
648845ab TZ |
1666 | sock_inuse_add(net, 1); |
1667 | } | |
1668 | ||
26abe143 | 1669 | sock_net_set(sk, net); |
14afee4b | 1670 | refcount_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1671 | |
2d758073 | 1672 | mem_cgroup_sk_alloc(sk); |
d979a39d | 1673 | cgroup_sk_alloc(&sk->sk_cgrp_data); |
2a56a1fe TH |
1674 | sock_update_classid(&sk->sk_cgrp_data); |
1675 | sock_update_netprioidx(&sk->sk_cgrp_data); | |
1da177e4 | 1676 | } |
a79af59e | 1677 | |
2e4afe7b | 1678 | return sk; |
1da177e4 | 1679 | } |
2a91525c | 1680 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1681 | |
a4298e45 ED |
1682 | /* Sockets having SOCK_RCU_FREE will call this function after one RCU |
1683 | * grace period. This is the case for UDP sockets and TCP listeners. | |
1684 | */ | |
1685 | static void __sk_destruct(struct rcu_head *head) | |
1da177e4 | 1686 | { |
a4298e45 | 1687 | struct sock *sk = container_of(head, struct sock, sk_rcu); |
1da177e4 | 1688 | struct sk_filter *filter; |
1da177e4 LT |
1689 | |
1690 | if (sk->sk_destruct) | |
1691 | sk->sk_destruct(sk); | |
1692 | ||
a898def2 | 1693 | filter = rcu_dereference_check(sk->sk_filter, |
14afee4b | 1694 | refcount_read(&sk->sk_wmem_alloc) == 0); |
1da177e4 | 1695 | if (filter) { |
309dd5fc | 1696 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1697 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 | 1698 | } |
538950a1 CG |
1699 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1700 | reuseport_detach_sock(sk); | |
1da177e4 | 1701 | |
08e29af3 | 1702 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 | 1703 | |
6ac99e8f MKL |
1704 | #ifdef CONFIG_BPF_SYSCALL |
1705 | bpf_sk_storage_free(sk); | |
1706 | #endif | |
1707 | ||
1da177e4 | 1708 | if (atomic_read(&sk->sk_omem_alloc)) |
e005d193 JP |
1709 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1710 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1711 | |
22a0e18e ED |
1712 | if (sk->sk_frag.page) { |
1713 | put_page(sk->sk_frag.page); | |
1714 | sk->sk_frag.page = NULL; | |
1715 | } | |
1716 | ||
109f6e39 EB |
1717 | if (sk->sk_peer_cred) |
1718 | put_cred(sk->sk_peer_cred); | |
1719 | put_pid(sk->sk_peer_pid); | |
26abe143 EB |
1720 | if (likely(sk->sk_net_refcnt)) |
1721 | put_net(sock_net(sk)); | |
c308c1b2 | 1722 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1723 | } |
2b85a34e | 1724 | |
a4298e45 ED |
1725 | void sk_destruct(struct sock *sk) |
1726 | { | |
1727 | if (sock_flag(sk, SOCK_RCU_FREE)) | |
1728 | call_rcu(&sk->sk_rcu, __sk_destruct); | |
1729 | else | |
1730 | __sk_destruct(&sk->sk_rcu); | |
1731 | } | |
1732 | ||
eb4cb008 CG |
1733 | static void __sk_free(struct sock *sk) |
1734 | { | |
648845ab TZ |
1735 | if (likely(sk->sk_net_refcnt)) |
1736 | sock_inuse_add(sock_net(sk), -1); | |
1737 | ||
9709020c | 1738 | if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk))) |
eb4cb008 CG |
1739 | sock_diag_broadcast_destroy(sk); |
1740 | else | |
1741 | sk_destruct(sk); | |
1742 | } | |
1743 | ||
2b85a34e ED |
1744 | void sk_free(struct sock *sk) |
1745 | { | |
1746 | /* | |
25985edc | 1747 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1748 | * some packets are still in some tx queue. |
1749 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1750 | */ | |
14afee4b | 1751 | if (refcount_dec_and_test(&sk->sk_wmem_alloc)) |
2b85a34e ED |
1752 | __sk_free(sk); |
1753 | } | |
2a91525c | 1754 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1755 | |
581319c5 PA |
1756 | static void sk_init_common(struct sock *sk) |
1757 | { | |
1758 | skb_queue_head_init(&sk->sk_receive_queue); | |
1759 | skb_queue_head_init(&sk->sk_write_queue); | |
1760 | skb_queue_head_init(&sk->sk_error_queue); | |
1761 | ||
1762 | rwlock_init(&sk->sk_callback_lock); | |
1763 | lockdep_set_class_and_name(&sk->sk_receive_queue.lock, | |
1764 | af_rlock_keys + sk->sk_family, | |
1765 | af_family_rlock_key_strings[sk->sk_family]); | |
1766 | lockdep_set_class_and_name(&sk->sk_write_queue.lock, | |
1767 | af_wlock_keys + sk->sk_family, | |
1768 | af_family_wlock_key_strings[sk->sk_family]); | |
1769 | lockdep_set_class_and_name(&sk->sk_error_queue.lock, | |
1770 | af_elock_keys + sk->sk_family, | |
1771 | af_family_elock_key_strings[sk->sk_family]); | |
1772 | lockdep_set_class_and_name(&sk->sk_callback_lock, | |
1773 | af_callback_keys + sk->sk_family, | |
1774 | af_family_clock_key_strings[sk->sk_family]); | |
1775 | } | |
1776 | ||
e56c57d0 ED |
1777 | /** |
1778 | * sk_clone_lock - clone a socket, and lock its clone | |
1779 | * @sk: the socket to clone | |
1780 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1781 | * | |
1782 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1783 | */ | |
1784 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1785 | { |
8fd1d178 | 1786 | struct sock *newsk; |
278571ba | 1787 | bool is_charged = true; |
87d11ceb | 1788 | |
8fd1d178 | 1789 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1790 | if (newsk != NULL) { |
1791 | struct sk_filter *filter; | |
1792 | ||
892c141e | 1793 | sock_copy(newsk, sk); |
87d11ceb | 1794 | |
9d538fa6 CP |
1795 | newsk->sk_prot_creator = sk->sk_prot; |
1796 | ||
87d11ceb | 1797 | /* SANITY */ |
8a681736 SV |
1798 | if (likely(newsk->sk_net_refcnt)) |
1799 | get_net(sock_net(newsk)); | |
87d11ceb ACM |
1800 | sk_node_init(&newsk->sk_node); |
1801 | sock_lock_init(newsk); | |
1802 | bh_lock_sock(newsk); | |
fa438ccf | 1803 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1804 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1805 | |
1806 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1807 | /* |
1808 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1809 | */ | |
14afee4b | 1810 | refcount_set(&newsk->sk_wmem_alloc, 1); |
87d11ceb | 1811 | atomic_set(&newsk->sk_omem_alloc, 0); |
581319c5 | 1812 | sk_init_common(newsk); |
87d11ceb ACM |
1813 | |
1814 | newsk->sk_dst_cache = NULL; | |
9b8805a3 | 1815 | newsk->sk_dst_pending_confirm = 0; |
87d11ceb ACM |
1816 | newsk->sk_wmem_queued = 0; |
1817 | newsk->sk_forward_alloc = 0; | |
9caad864 | 1818 | atomic_set(&newsk->sk_drops, 0); |
87d11ceb | 1819 | newsk->sk_send_head = NULL; |
87d11ceb | 1820 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
52267790 | 1821 | atomic_set(&newsk->sk_zckey, 0); |
87d11ceb ACM |
1822 | |
1823 | sock_reset_flag(newsk, SOCK_DONE); | |
edbe69ef | 1824 | mem_cgroup_sk_alloc(newsk); |
c0576e39 | 1825 | cgroup_sk_alloc(&newsk->sk_cgrp_data); |
87d11ceb | 1826 | |
eefca20e ED |
1827 | rcu_read_lock(); |
1828 | filter = rcu_dereference(sk->sk_filter); | |
87d11ceb | 1829 | if (filter != NULL) |
278571ba AS |
1830 | /* though it's an empty new sock, the charging may fail |
1831 | * if sysctl_optmem_max was changed between creation of | |
1832 | * original socket and cloning | |
1833 | */ | |
1834 | is_charged = sk_filter_charge(newsk, filter); | |
eefca20e ED |
1835 | RCU_INIT_POINTER(newsk->sk_filter, filter); |
1836 | rcu_read_unlock(); | |
87d11ceb | 1837 | |
d188ba86 | 1838 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { |
a97e50cc DB |
1839 | /* We need to make sure that we don't uncharge the new |
1840 | * socket if we couldn't charge it in the first place | |
1841 | * as otherwise we uncharge the parent's filter. | |
1842 | */ | |
1843 | if (!is_charged) | |
1844 | RCU_INIT_POINTER(newsk->sk_filter, NULL); | |
94352d45 | 1845 | sk_free_unlock_clone(newsk); |
87d11ceb ACM |
1846 | newsk = NULL; |
1847 | goto out; | |
1848 | } | |
fa463497 | 1849 | RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); |
f12dd759 MKL |
1850 | #ifdef CONFIG_BPF_SYSCALL |
1851 | RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL); | |
1852 | #endif | |
87d11ceb ACM |
1853 | |
1854 | newsk->sk_err = 0; | |
e551c32d | 1855 | newsk->sk_err_soft = 0; |
87d11ceb | 1856 | newsk->sk_priority = 0; |
2c8c56e1 | 1857 | newsk->sk_incoming_cpu = raw_smp_processor_id(); |
648845ab TZ |
1858 | if (likely(newsk->sk_net_refcnt)) |
1859 | sock_inuse_add(sock_net(newsk), 1); | |
d979a39d | 1860 | |
4dc6dc71 ED |
1861 | /* |
1862 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1863 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1864 | */ | |
1865 | smp_wmb(); | |
41c6d650 | 1866 | refcount_set(&newsk->sk_refcnt, 2); |
87d11ceb ACM |
1867 | |
1868 | /* | |
1869 | * Increment the counter in the same struct proto as the master | |
1870 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1871 | * is the same as sk->sk_prot->socks, as this field was copied | |
1872 | * with memcpy). | |
1873 | * | |
1874 | * This _changes_ the previous behaviour, where | |
1875 | * tcp_create_openreq_child always was incrementing the | |
1876 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1877 | * to be taken into account in all callers. -acme | |
1878 | */ | |
1879 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1880 | sk_set_socket(newsk, NULL); |
c2f26e8f | 1881 | RCU_INIT_POINTER(newsk->sk_wq, NULL); |
87d11ceb ACM |
1882 | |
1883 | if (newsk->sk_prot->sockets_allocated) | |
180d8cd9 | 1884 | sk_sockets_allocated_inc(newsk); |
704da560 | 1885 | |
080a270f HFS |
1886 | if (sock_needs_netstamp(sk) && |
1887 | newsk->sk_flags & SK_FLAGS_TIMESTAMP) | |
704da560 | 1888 | net_enable_timestamp(); |
87d11ceb ACM |
1889 | } |
1890 | out: | |
1891 | return newsk; | |
1892 | } | |
e56c57d0 | 1893 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1894 | |
94352d45 ACM |
1895 | void sk_free_unlock_clone(struct sock *sk) |
1896 | { | |
1897 | /* It is still raw copy of parent, so invalidate | |
1898 | * destructor and make plain sk_free() */ | |
1899 | sk->sk_destruct = NULL; | |
1900 | bh_unlock_sock(sk); | |
1901 | sk_free(sk); | |
1902 | } | |
1903 | EXPORT_SYMBOL_GPL(sk_free_unlock_clone); | |
1904 | ||
9958089a AK |
1905 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1906 | { | |
d6a4e26a ED |
1907 | u32 max_segs = 1; |
1908 | ||
6bd4f355 | 1909 | sk_dst_set(sk, dst); |
0a6b2a1d | 1910 | sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps; |
9958089a | 1911 | if (sk->sk_route_caps & NETIF_F_GSO) |
4fcd6b99 | 1912 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1913 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1914 | if (sk_can_gso(sk)) { |
f70f250a | 1915 | if (dst->header_len && !xfrm_dst_offload_ok(dst)) { |
9958089a | 1916 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1917 | } else { |
9958089a | 1918 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1919 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
d6a4e26a | 1920 | max_segs = max_t(u32, dst->dev->gso_max_segs, 1); |
82cc1a7a | 1921 | } |
9958089a | 1922 | } |
d6a4e26a | 1923 | sk->sk_gso_max_segs = max_segs; |
9958089a AK |
1924 | } |
1925 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1926 | ||
1da177e4 LT |
1927 | /* |
1928 | * Simple resource managers for sockets. | |
1929 | */ | |
1930 | ||
1931 | ||
4ec93edb YH |
1932 | /* |
1933 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1934 | */ |
1935 | void sock_wfree(struct sk_buff *skb) | |
1936 | { | |
1937 | struct sock *sk = skb->sk; | |
d99927f4 | 1938 | unsigned int len = skb->truesize; |
1da177e4 | 1939 | |
d99927f4 ED |
1940 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1941 | /* | |
1942 | * Keep a reference on sk_wmem_alloc, this will be released | |
1943 | * after sk_write_space() call | |
1944 | */ | |
14afee4b | 1945 | WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc)); |
1da177e4 | 1946 | sk->sk_write_space(sk); |
d99927f4 ED |
1947 | len = 1; |
1948 | } | |
2b85a34e | 1949 | /* |
d99927f4 ED |
1950 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1951 | * could not do because of in-flight packets | |
2b85a34e | 1952 | */ |
14afee4b | 1953 | if (refcount_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1954 | __sk_free(sk); |
1da177e4 | 1955 | } |
2a91525c | 1956 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1957 | |
1d2077ac ED |
1958 | /* This variant of sock_wfree() is used by TCP, |
1959 | * since it sets SOCK_USE_WRITE_QUEUE. | |
1960 | */ | |
1961 | void __sock_wfree(struct sk_buff *skb) | |
1962 | { | |
1963 | struct sock *sk = skb->sk; | |
1964 | ||
14afee4b | 1965 | if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) |
1d2077ac ED |
1966 | __sk_free(sk); |
1967 | } | |
1968 | ||
9e17f8a4 ED |
1969 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
1970 | { | |
1971 | skb_orphan(skb); | |
1972 | skb->sk = sk; | |
1973 | #ifdef CONFIG_INET | |
1974 | if (unlikely(!sk_fullsock(sk))) { | |
1975 | skb->destructor = sock_edemux; | |
1976 | sock_hold(sk); | |
1977 | return; | |
1978 | } | |
1979 | #endif | |
1980 | skb->destructor = sock_wfree; | |
1981 | skb_set_hash_from_sk(skb, sk); | |
1982 | /* | |
1983 | * We used to take a refcount on sk, but following operation | |
1984 | * is enough to guarantee sk_free() wont free this sock until | |
1985 | * all in-flight packets are completed | |
1986 | */ | |
14afee4b | 1987 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
9e17f8a4 ED |
1988 | } |
1989 | EXPORT_SYMBOL(skb_set_owner_w); | |
1990 | ||
1d2077ac ED |
1991 | /* This helper is used by netem, as it can hold packets in its |
1992 | * delay queue. We want to allow the owner socket to send more | |
1993 | * packets, as if they were already TX completed by a typical driver. | |
1994 | * But we also want to keep skb->sk set because some packet schedulers | |
f6ba8d33 | 1995 | * rely on it (sch_fq for example). |
1d2077ac | 1996 | */ |
f2f872f9 ED |
1997 | void skb_orphan_partial(struct sk_buff *skb) |
1998 | { | |
f6ba8d33 | 1999 | if (skb_is_tcp_pure_ack(skb)) |
1d2077ac ED |
2000 | return; |
2001 | ||
f2f872f9 ED |
2002 | if (skb->destructor == sock_wfree |
2003 | #ifdef CONFIG_INET | |
2004 | || skb->destructor == tcp_wfree | |
2005 | #endif | |
2006 | ) { | |
f6ba8d33 ED |
2007 | struct sock *sk = skb->sk; |
2008 | ||
41c6d650 | 2009 | if (refcount_inc_not_zero(&sk->sk_refcnt)) { |
14afee4b | 2010 | WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)); |
f6ba8d33 ED |
2011 | skb->destructor = sock_efree; |
2012 | } | |
f2f872f9 ED |
2013 | } else { |
2014 | skb_orphan(skb); | |
2015 | } | |
2016 | } | |
2017 | EXPORT_SYMBOL(skb_orphan_partial); | |
2018 | ||
4ec93edb YH |
2019 | /* |
2020 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
2021 | */ |
2022 | void sock_rfree(struct sk_buff *skb) | |
2023 | { | |
2024 | struct sock *sk = skb->sk; | |
d361fd59 | 2025 | unsigned int len = skb->truesize; |
1da177e4 | 2026 | |
d361fd59 ED |
2027 | atomic_sub(len, &sk->sk_rmem_alloc); |
2028 | sk_mem_uncharge(sk, len); | |
1da177e4 | 2029 | } |
2a91525c | 2030 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 2031 | |
7768eed8 OH |
2032 | /* |
2033 | * Buffer destructor for skbs that are not used directly in read or write | |
2034 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. | |
2035 | */ | |
62bccb8c AD |
2036 | void sock_efree(struct sk_buff *skb) |
2037 | { | |
2038 | sock_put(skb->sk); | |
2039 | } | |
2040 | EXPORT_SYMBOL(sock_efree); | |
2041 | ||
976d0201 | 2042 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 2043 | { |
976d0201 | 2044 | kuid_t uid; |
1da177e4 | 2045 | |
f064af1e | 2046 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 2047 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 2048 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
2049 | return uid; |
2050 | } | |
2a91525c | 2051 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
2052 | |
2053 | unsigned long sock_i_ino(struct sock *sk) | |
2054 | { | |
2055 | unsigned long ino; | |
2056 | ||
f064af1e | 2057 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 2058 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 2059 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
2060 | return ino; |
2061 | } | |
2a91525c | 2062 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
2063 | |
2064 | /* | |
2065 | * Allocate a skb from the socket's send buffer. | |
2066 | */ | |
86a76caf | 2067 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 2068 | gfp_t priority) |
1da177e4 | 2069 | { |
14afee4b | 2070 | if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
2a91525c | 2071 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
2072 | if (skb) { |
2073 | skb_set_owner_w(skb, sk); | |
2074 | return skb; | |
2075 | } | |
2076 | } | |
2077 | return NULL; | |
2078 | } | |
2a91525c | 2079 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 | 2080 | |
98ba0bd5 WB |
2081 | static void sock_ofree(struct sk_buff *skb) |
2082 | { | |
2083 | struct sock *sk = skb->sk; | |
2084 | ||
2085 | atomic_sub(skb->truesize, &sk->sk_omem_alloc); | |
2086 | } | |
2087 | ||
2088 | struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, | |
2089 | gfp_t priority) | |
2090 | { | |
2091 | struct sk_buff *skb; | |
2092 | ||
2093 | /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */ | |
2094 | if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) > | |
2095 | sysctl_optmem_max) | |
2096 | return NULL; | |
2097 | ||
2098 | skb = alloc_skb(size, priority); | |
2099 | if (!skb) | |
2100 | return NULL; | |
2101 | ||
2102 | atomic_add(skb->truesize, &sk->sk_omem_alloc); | |
2103 | skb->sk = sk; | |
2104 | skb->destructor = sock_ofree; | |
2105 | return skb; | |
2106 | } | |
2107 | ||
4ec93edb | 2108 | /* |
1da177e4 | 2109 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 2110 | */ |
dd0fc66f | 2111 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 2112 | { |
95c96174 | 2113 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
2114 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
2115 | void *mem; | |
2116 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 2117 | * might sleep. |
1da177e4 LT |
2118 | */ |
2119 | atomic_add(size, &sk->sk_omem_alloc); | |
2120 | mem = kmalloc(size, priority); | |
2121 | if (mem) | |
2122 | return mem; | |
2123 | atomic_sub(size, &sk->sk_omem_alloc); | |
2124 | } | |
2125 | return NULL; | |
2126 | } | |
2a91525c | 2127 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 | 2128 | |
79e88659 DB |
2129 | /* Free an option memory block. Note, we actually want the inline |
2130 | * here as this allows gcc to detect the nullify and fold away the | |
2131 | * condition entirely. | |
1da177e4 | 2132 | */ |
79e88659 DB |
2133 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
2134 | const bool nullify) | |
1da177e4 | 2135 | { |
e53da5fb DM |
2136 | if (WARN_ON_ONCE(!mem)) |
2137 | return; | |
79e88659 DB |
2138 | if (nullify) |
2139 | kzfree(mem); | |
2140 | else | |
2141 | kfree(mem); | |
1da177e4 LT |
2142 | atomic_sub(size, &sk->sk_omem_alloc); |
2143 | } | |
79e88659 DB |
2144 | |
2145 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
2146 | { | |
2147 | __sock_kfree_s(sk, mem, size, false); | |
2148 | } | |
2a91525c | 2149 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 | 2150 | |
79e88659 DB |
2151 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
2152 | { | |
2153 | __sock_kfree_s(sk, mem, size, true); | |
2154 | } | |
2155 | EXPORT_SYMBOL(sock_kzfree_s); | |
2156 | ||
1da177e4 LT |
2157 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
2158 | I think, these locks should be removed for datagram sockets. | |
2159 | */ | |
2a91525c | 2160 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
2161 | { |
2162 | DEFINE_WAIT(wait); | |
2163 | ||
9cd3e072 | 2164 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
2165 | for (;;) { |
2166 | if (!timeo) | |
2167 | break; | |
2168 | if (signal_pending(current)) | |
2169 | break; | |
2170 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 2171 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
14afee4b | 2172 | if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1da177e4 LT |
2173 | break; |
2174 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
2175 | break; | |
2176 | if (sk->sk_err) | |
2177 | break; | |
2178 | timeo = schedule_timeout(timeo); | |
2179 | } | |
aa395145 | 2180 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
2181 | return timeo; |
2182 | } | |
2183 | ||
2184 | ||
2185 | /* | |
2186 | * Generic send/receive buffer handlers | |
2187 | */ | |
2188 | ||
4cc7f68d HX |
2189 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
2190 | unsigned long data_len, int noblock, | |
28d64271 | 2191 | int *errcode, int max_page_order) |
1da177e4 | 2192 | { |
2e4e4410 | 2193 | struct sk_buff *skb; |
1da177e4 LT |
2194 | long timeo; |
2195 | int err; | |
2196 | ||
1da177e4 | 2197 | timeo = sock_sndtimeo(sk, noblock); |
2e4e4410 | 2198 | for (;;) { |
1da177e4 LT |
2199 | err = sock_error(sk); |
2200 | if (err != 0) | |
2201 | goto failure; | |
2202 | ||
2203 | err = -EPIPE; | |
2204 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
2205 | goto failure; | |
2206 | ||
2e4e4410 ED |
2207 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
2208 | break; | |
28d64271 | 2209 | |
9cd3e072 | 2210 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
2e4e4410 ED |
2211 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
2212 | err = -EAGAIN; | |
2213 | if (!timeo) | |
1da177e4 | 2214 | goto failure; |
2e4e4410 ED |
2215 | if (signal_pending(current)) |
2216 | goto interrupted; | |
2217 | timeo = sock_wait_for_wmem(sk, timeo); | |
1da177e4 | 2218 | } |
2e4e4410 ED |
2219 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
2220 | errcode, sk->sk_allocation); | |
2221 | if (skb) | |
2222 | skb_set_owner_w(skb, sk); | |
1da177e4 LT |
2223 | return skb; |
2224 | ||
2225 | interrupted: | |
2226 | err = sock_intr_errno(timeo); | |
2227 | failure: | |
2228 | *errcode = err; | |
2229 | return NULL; | |
2230 | } | |
4cc7f68d | 2231 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 2232 | |
4ec93edb | 2233 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
2234 | int noblock, int *errcode) |
2235 | { | |
28d64271 | 2236 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
1da177e4 | 2237 | } |
2a91525c | 2238 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 2239 | |
39771b12 WB |
2240 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
2241 | struct sockcm_cookie *sockc) | |
2242 | { | |
3dd17e63 SHY |
2243 | u32 tsflags; |
2244 | ||
39771b12 WB |
2245 | switch (cmsg->cmsg_type) { |
2246 | case SO_MARK: | |
2247 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
2248 | return -EPERM; | |
2249 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
2250 | return -EINVAL; | |
2251 | sockc->mark = *(u32 *)CMSG_DATA(cmsg); | |
2252 | break; | |
7f1bc6e9 | 2253 | case SO_TIMESTAMPING_OLD: |
3dd17e63 SHY |
2254 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) |
2255 | return -EINVAL; | |
2256 | ||
2257 | tsflags = *(u32 *)CMSG_DATA(cmsg); | |
2258 | if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) | |
2259 | return -EINVAL; | |
2260 | ||
2261 | sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; | |
2262 | sockc->tsflags |= tsflags; | |
2263 | break; | |
80b14dee RC |
2264 | case SCM_TXTIME: |
2265 | if (!sock_flag(sk, SOCK_TXTIME)) | |
2266 | return -EINVAL; | |
2267 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64))) | |
2268 | return -EINVAL; | |
2269 | sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg)); | |
2270 | break; | |
779f1ede SHY |
2271 | /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */ |
2272 | case SCM_RIGHTS: | |
2273 | case SCM_CREDENTIALS: | |
2274 | break; | |
39771b12 WB |
2275 | default: |
2276 | return -EINVAL; | |
2277 | } | |
2278 | return 0; | |
2279 | } | |
2280 | EXPORT_SYMBOL(__sock_cmsg_send); | |
2281 | ||
f28ea365 EJ |
2282 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
2283 | struct sockcm_cookie *sockc) | |
2284 | { | |
2285 | struct cmsghdr *cmsg; | |
39771b12 | 2286 | int ret; |
f28ea365 EJ |
2287 | |
2288 | for_each_cmsghdr(cmsg, msg) { | |
2289 | if (!CMSG_OK(msg, cmsg)) | |
2290 | return -EINVAL; | |
2291 | if (cmsg->cmsg_level != SOL_SOCKET) | |
2292 | continue; | |
39771b12 WB |
2293 | ret = __sock_cmsg_send(sk, msg, cmsg, sockc); |
2294 | if (ret) | |
2295 | return ret; | |
f28ea365 EJ |
2296 | } |
2297 | return 0; | |
2298 | } | |
2299 | EXPORT_SYMBOL(sock_cmsg_send); | |
2300 | ||
06044751 ED |
2301 | static void sk_enter_memory_pressure(struct sock *sk) |
2302 | { | |
2303 | if (!sk->sk_prot->enter_memory_pressure) | |
2304 | return; | |
2305 | ||
2306 | sk->sk_prot->enter_memory_pressure(sk); | |
2307 | } | |
2308 | ||
2309 | static void sk_leave_memory_pressure(struct sock *sk) | |
2310 | { | |
2311 | if (sk->sk_prot->leave_memory_pressure) { | |
2312 | sk->sk_prot->leave_memory_pressure(sk); | |
2313 | } else { | |
2314 | unsigned long *memory_pressure = sk->sk_prot->memory_pressure; | |
2315 | ||
2316 | if (memory_pressure && *memory_pressure) | |
2317 | *memory_pressure = 0; | |
2318 | } | |
2319 | } | |
2320 | ||
5640f768 ED |
2321 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
2322 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
ce27ec60 | 2323 | DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key); |
5640f768 | 2324 | |
400dfd3a ED |
2325 | /** |
2326 | * skb_page_frag_refill - check that a page_frag contains enough room | |
2327 | * @sz: minimum size of the fragment we want to get | |
2328 | * @pfrag: pointer to page_frag | |
82d5e2b8 | 2329 | * @gfp: priority for memory allocation |
400dfd3a ED |
2330 | * |
2331 | * Note: While this allocator tries to use high order pages, there is | |
2332 | * no guarantee that allocations succeed. Therefore, @sz MUST be | |
2333 | * less or equal than PAGE_SIZE. | |
2334 | */ | |
d9b2938a | 2335 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
5640f768 | 2336 | { |
5640f768 | 2337 | if (pfrag->page) { |
fe896d18 | 2338 | if (page_ref_count(pfrag->page) == 1) { |
5640f768 ED |
2339 | pfrag->offset = 0; |
2340 | return true; | |
2341 | } | |
400dfd3a | 2342 | if (pfrag->offset + sz <= pfrag->size) |
5640f768 ED |
2343 | return true; |
2344 | put_page(pfrag->page); | |
2345 | } | |
2346 | ||
d9b2938a | 2347 | pfrag->offset = 0; |
ce27ec60 ED |
2348 | if (SKB_FRAG_PAGE_ORDER && |
2349 | !static_branch_unlikely(&net_high_order_alloc_disable_key)) { | |
d0164adc MG |
2350 | /* Avoid direct reclaim but allow kswapd to wake */ |
2351 | pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | | |
2352 | __GFP_COMP | __GFP_NOWARN | | |
2353 | __GFP_NORETRY, | |
d9b2938a | 2354 | SKB_FRAG_PAGE_ORDER); |
5640f768 | 2355 | if (likely(pfrag->page)) { |
d9b2938a | 2356 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
5640f768 ED |
2357 | return true; |
2358 | } | |
d9b2938a ED |
2359 | } |
2360 | pfrag->page = alloc_page(gfp); | |
2361 | if (likely(pfrag->page)) { | |
2362 | pfrag->size = PAGE_SIZE; | |
2363 | return true; | |
2364 | } | |
400dfd3a ED |
2365 | return false; |
2366 | } | |
2367 | EXPORT_SYMBOL(skb_page_frag_refill); | |
2368 | ||
2369 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
2370 | { | |
2371 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) | |
2372 | return true; | |
2373 | ||
5640f768 ED |
2374 | sk_enter_memory_pressure(sk); |
2375 | sk_stream_moderate_sndbuf(sk); | |
2376 | return false; | |
2377 | } | |
2378 | EXPORT_SYMBOL(sk_page_frag_refill); | |
2379 | ||
1da177e4 | 2380 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
2381 | __releases(&sk->sk_lock.slock) |
2382 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
2383 | { |
2384 | DEFINE_WAIT(wait); | |
2385 | ||
e71a4783 | 2386 | for (;;) { |
1da177e4 LT |
2387 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
2388 | TASK_UNINTERRUPTIBLE); | |
2389 | spin_unlock_bh(&sk->sk_lock.slock); | |
2390 | schedule(); | |
2391 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 2392 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
2393 | break; |
2394 | } | |
2395 | finish_wait(&sk->sk_lock.wq, &wait); | |
2396 | } | |
2397 | ||
8873c064 | 2398 | void __release_sock(struct sock *sk) |
f39234d6 NK |
2399 | __releases(&sk->sk_lock.slock) |
2400 | __acquires(&sk->sk_lock.slock) | |
1da177e4 | 2401 | { |
5413d1ba | 2402 | struct sk_buff *skb, *next; |
1da177e4 | 2403 | |
5413d1ba | 2404 | while ((skb = sk->sk_backlog.head) != NULL) { |
1da177e4 | 2405 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
1da177e4 | 2406 | |
5413d1ba | 2407 | spin_unlock_bh(&sk->sk_lock.slock); |
1da177e4 | 2408 | |
5413d1ba ED |
2409 | do { |
2410 | next = skb->next; | |
e4cbb02a | 2411 | prefetch(next); |
7fee226a | 2412 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
a8305bff | 2413 | skb_mark_not_on_list(skb); |
c57943a1 | 2414 | sk_backlog_rcv(sk, skb); |
1da177e4 | 2415 | |
5413d1ba | 2416 | cond_resched(); |
1da177e4 LT |
2417 | |
2418 | skb = next; | |
2419 | } while (skb != NULL); | |
2420 | ||
5413d1ba ED |
2421 | spin_lock_bh(&sk->sk_lock.slock); |
2422 | } | |
8eae939f ZY |
2423 | |
2424 | /* | |
2425 | * Doing the zeroing here guarantee we can not loop forever | |
2426 | * while a wild producer attempts to flood us. | |
2427 | */ | |
2428 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
2429 | } |
2430 | ||
d41a69f1 ED |
2431 | void __sk_flush_backlog(struct sock *sk) |
2432 | { | |
2433 | spin_lock_bh(&sk->sk_lock.slock); | |
2434 | __release_sock(sk); | |
2435 | spin_unlock_bh(&sk->sk_lock.slock); | |
2436 | } | |
2437 | ||
1da177e4 LT |
2438 | /** |
2439 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
2440 | * @sk: sock to wait on |
2441 | * @timeo: for how long | |
dfbafc99 | 2442 | * @skb: last skb seen on sk_receive_queue |
1da177e4 LT |
2443 | * |
2444 | * Now socket state including sk->sk_err is changed only under lock, | |
2445 | * hence we may omit checks after joining wait queue. | |
2446 | * We check receive queue before schedule() only as optimization; | |
2447 | * it is very likely that release_sock() added new data. | |
2448 | */ | |
dfbafc99 | 2449 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) |
1da177e4 | 2450 | { |
d9dc8b0f | 2451 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1da177e4 | 2452 | int rc; |
1da177e4 | 2453 | |
d9dc8b0f | 2454 | add_wait_queue(sk_sleep(sk), &wait); |
9cd3e072 | 2455 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2456 | rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait); |
9cd3e072 | 2457 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2458 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
2459 | return rc; |
2460 | } | |
1da177e4 LT |
2461 | EXPORT_SYMBOL(sk_wait_data); |
2462 | ||
3ab224be | 2463 | /** |
f8c3bf00 | 2464 | * __sk_mem_raise_allocated - increase memory_allocated |
3ab224be HA |
2465 | * @sk: socket |
2466 | * @size: memory size to allocate | |
f8c3bf00 | 2467 | * @amt: pages to allocate |
3ab224be HA |
2468 | * @kind: allocation type |
2469 | * | |
f8c3bf00 | 2470 | * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc |
3ab224be | 2471 | */ |
f8c3bf00 | 2472 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind) |
3ab224be HA |
2473 | { |
2474 | struct proto *prot = sk->sk_prot; | |
f8c3bf00 | 2475 | long allocated = sk_memory_allocated_add(sk, amt); |
d6f19938 | 2476 | bool charged = true; |
e805605c | 2477 | |
baac50bb | 2478 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
d6f19938 | 2479 | !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt))) |
e805605c | 2480 | goto suppress_allocation; |
3ab224be HA |
2481 | |
2482 | /* Under limit. */ | |
e805605c | 2483 | if (allocated <= sk_prot_mem_limits(sk, 0)) { |
180d8cd9 | 2484 | sk_leave_memory_pressure(sk); |
3ab224be HA |
2485 | return 1; |
2486 | } | |
2487 | ||
e805605c JW |
2488 | /* Under pressure. */ |
2489 | if (allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 2490 | sk_enter_memory_pressure(sk); |
3ab224be | 2491 | |
e805605c JW |
2492 | /* Over hard limit. */ |
2493 | if (allocated > sk_prot_mem_limits(sk, 2)) | |
3ab224be HA |
2494 | goto suppress_allocation; |
2495 | ||
2496 | /* guarantee minimum buffer size under pressure */ | |
2497 | if (kind == SK_MEM_RECV) { | |
a3dcaf17 | 2498 | if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot)) |
3ab224be | 2499 | return 1; |
180d8cd9 | 2500 | |
3ab224be | 2501 | } else { /* SK_MEM_SEND */ |
a3dcaf17 ED |
2502 | int wmem0 = sk_get_wmem0(sk, prot); |
2503 | ||
3ab224be | 2504 | if (sk->sk_type == SOCK_STREAM) { |
a3dcaf17 | 2505 | if (sk->sk_wmem_queued < wmem0) |
3ab224be | 2506 | return 1; |
a3dcaf17 | 2507 | } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) { |
3ab224be | 2508 | return 1; |
a3dcaf17 | 2509 | } |
3ab224be HA |
2510 | } |
2511 | ||
180d8cd9 | 2512 | if (sk_has_memory_pressure(sk)) { |
5bf325a5 | 2513 | u64 alloc; |
1748376b | 2514 | |
180d8cd9 | 2515 | if (!sk_under_memory_pressure(sk)) |
1748376b | 2516 | return 1; |
180d8cd9 GC |
2517 | alloc = sk_sockets_allocated_read_positive(sk); |
2518 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
2519 | sk_mem_pages(sk->sk_wmem_queued + |
2520 | atomic_read(&sk->sk_rmem_alloc) + | |
2521 | sk->sk_forward_alloc)) | |
2522 | return 1; | |
2523 | } | |
2524 | ||
2525 | suppress_allocation: | |
2526 | ||
2527 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
2528 | sk_stream_moderate_sndbuf(sk); | |
2529 | ||
2530 | /* Fail only if socket is _under_ its sndbuf. | |
2531 | * In this case we cannot block, so that we have to fail. | |
2532 | */ | |
2533 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
2534 | return 1; | |
2535 | } | |
2536 | ||
d6f19938 YS |
2537 | if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged)) |
2538 | trace_sock_exceed_buf_limit(sk, prot, allocated, kind); | |
3847ce32 | 2539 | |
0e90b31f | 2540 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 2541 | |
baac50bb JW |
2542 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2543 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); | |
e805605c | 2544 | |
3ab224be HA |
2545 | return 0; |
2546 | } | |
f8c3bf00 PA |
2547 | EXPORT_SYMBOL(__sk_mem_raise_allocated); |
2548 | ||
2549 | /** | |
2550 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
2551 | * @sk: socket | |
2552 | * @size: memory size to allocate | |
2553 | * @kind: allocation type | |
2554 | * | |
2555 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
2556 | * rmem allocation. This function assumes that protocols which have | |
2557 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
2558 | */ | |
2559 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
2560 | { | |
2561 | int ret, amt = sk_mem_pages(size); | |
2562 | ||
2563 | sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT; | |
2564 | ret = __sk_mem_raise_allocated(sk, size, amt, kind); | |
2565 | if (!ret) | |
2566 | sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT; | |
2567 | return ret; | |
2568 | } | |
3ab224be HA |
2569 | EXPORT_SYMBOL(__sk_mem_schedule); |
2570 | ||
2571 | /** | |
f8c3bf00 | 2572 | * __sk_mem_reduce_allocated - reclaim memory_allocated |
3ab224be | 2573 | * @sk: socket |
f8c3bf00 PA |
2574 | * @amount: number of quanta |
2575 | * | |
2576 | * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc | |
3ab224be | 2577 | */ |
f8c3bf00 | 2578 | void __sk_mem_reduce_allocated(struct sock *sk, int amount) |
3ab224be | 2579 | { |
1a24e04e | 2580 | sk_memory_allocated_sub(sk, amount); |
3ab224be | 2581 | |
baac50bb JW |
2582 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2583 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); | |
e805605c | 2584 | |
180d8cd9 GC |
2585 | if (sk_under_memory_pressure(sk) && |
2586 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2587 | sk_leave_memory_pressure(sk); | |
3ab224be | 2588 | } |
f8c3bf00 PA |
2589 | EXPORT_SYMBOL(__sk_mem_reduce_allocated); |
2590 | ||
2591 | /** | |
2592 | * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated | |
2593 | * @sk: socket | |
2594 | * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) | |
2595 | */ | |
2596 | void __sk_mem_reclaim(struct sock *sk, int amount) | |
2597 | { | |
2598 | amount >>= SK_MEM_QUANTUM_SHIFT; | |
2599 | sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; | |
2600 | __sk_mem_reduce_allocated(sk, amount); | |
2601 | } | |
3ab224be HA |
2602 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2603 | ||
627d2d6b | 2604 | int sk_set_peek_off(struct sock *sk, int val) |
2605 | { | |
627d2d6b | 2606 | sk->sk_peek_off = val; |
2607 | return 0; | |
2608 | } | |
2609 | EXPORT_SYMBOL_GPL(sk_set_peek_off); | |
3ab224be | 2610 | |
1da177e4 LT |
2611 | /* |
2612 | * Set of default routines for initialising struct proto_ops when | |
2613 | * the protocol does not support a particular function. In certain | |
2614 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2615 | * function, some default processing is provided. | |
2616 | */ | |
2617 | ||
2618 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2619 | { | |
2620 | return -EOPNOTSUPP; | |
2621 | } | |
2a91525c | 2622 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2623 | |
4ec93edb | 2624 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2625 | int len, int flags) |
2626 | { | |
2627 | return -EOPNOTSUPP; | |
2628 | } | |
2a91525c | 2629 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2630 | |
2631 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2632 | { | |
2633 | return -EOPNOTSUPP; | |
2634 | } | |
2a91525c | 2635 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 | 2636 | |
cdfbabfb DH |
2637 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags, |
2638 | bool kern) | |
1da177e4 LT |
2639 | { |
2640 | return -EOPNOTSUPP; | |
2641 | } | |
2a91525c | 2642 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2643 | |
4ec93edb | 2644 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
9b2c45d4 | 2645 | int peer) |
1da177e4 LT |
2646 | { |
2647 | return -EOPNOTSUPP; | |
2648 | } | |
2a91525c | 2649 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2650 | |
1da177e4 LT |
2651 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
2652 | { | |
2653 | return -EOPNOTSUPP; | |
2654 | } | |
2a91525c | 2655 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2656 | |
2657 | int sock_no_listen(struct socket *sock, int backlog) | |
2658 | { | |
2659 | return -EOPNOTSUPP; | |
2660 | } | |
2a91525c | 2661 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2662 | |
2663 | int sock_no_shutdown(struct socket *sock, int how) | |
2664 | { | |
2665 | return -EOPNOTSUPP; | |
2666 | } | |
2a91525c | 2667 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2668 | |
2669 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2670 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2671 | { |
2672 | return -EOPNOTSUPP; | |
2673 | } | |
2a91525c | 2674 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2675 | |
2676 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2677 | char __user *optval, int __user *optlen) | |
2678 | { | |
2679 | return -EOPNOTSUPP; | |
2680 | } | |
2a91525c | 2681 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 | 2682 | |
1b784140 | 2683 | int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
1da177e4 LT |
2684 | { |
2685 | return -EOPNOTSUPP; | |
2686 | } | |
2a91525c | 2687 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 | 2688 | |
306b13eb TH |
2689 | int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len) |
2690 | { | |
2691 | return -EOPNOTSUPP; | |
2692 | } | |
2693 | EXPORT_SYMBOL(sock_no_sendmsg_locked); | |
2694 | ||
1b784140 YX |
2695 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
2696 | int flags) | |
1da177e4 LT |
2697 | { |
2698 | return -EOPNOTSUPP; | |
2699 | } | |
2a91525c | 2700 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2701 | |
2702 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2703 | { | |
2704 | /* Mirror missing mmap method error code */ | |
2705 | return -ENODEV; | |
2706 | } | |
2a91525c | 2707 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2708 | |
2709 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2710 | { | |
2711 | ssize_t res; | |
2712 | struct msghdr msg = {.msg_flags = flags}; | |
2713 | struct kvec iov; | |
2714 | char *kaddr = kmap(page); | |
2715 | iov.iov_base = kaddr + offset; | |
2716 | iov.iov_len = size; | |
2717 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2718 | kunmap(page); | |
2719 | return res; | |
2720 | } | |
2a91525c | 2721 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 | 2722 | |
306b13eb TH |
2723 | ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, |
2724 | int offset, size_t size, int flags) | |
2725 | { | |
2726 | ssize_t res; | |
2727 | struct msghdr msg = {.msg_flags = flags}; | |
2728 | struct kvec iov; | |
2729 | char *kaddr = kmap(page); | |
2730 | ||
2731 | iov.iov_base = kaddr + offset; | |
2732 | iov.iov_len = size; | |
2733 | res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size); | |
2734 | kunmap(page); | |
2735 | return res; | |
2736 | } | |
2737 | EXPORT_SYMBOL(sock_no_sendpage_locked); | |
2738 | ||
1da177e4 LT |
2739 | /* |
2740 | * Default Socket Callbacks | |
2741 | */ | |
2742 | ||
2743 | static void sock_def_wakeup(struct sock *sk) | |
2744 | { | |
43815482 ED |
2745 | struct socket_wq *wq; |
2746 | ||
2747 | rcu_read_lock(); | |
2748 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2749 | if (skwq_has_sleeper(wq)) |
43815482 ED |
2750 | wake_up_interruptible_all(&wq->wait); |
2751 | rcu_read_unlock(); | |
1da177e4 LT |
2752 | } |
2753 | ||
2754 | static void sock_def_error_report(struct sock *sk) | |
2755 | { | |
43815482 ED |
2756 | struct socket_wq *wq; |
2757 | ||
2758 | rcu_read_lock(); | |
2759 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2760 | if (skwq_has_sleeper(wq)) |
a9a08845 | 2761 | wake_up_interruptible_poll(&wq->wait, EPOLLERR); |
8d8ad9d7 | 2762 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2763 | rcu_read_unlock(); |
1da177e4 LT |
2764 | } |
2765 | ||
676d2369 | 2766 | static void sock_def_readable(struct sock *sk) |
1da177e4 | 2767 | { |
43815482 ED |
2768 | struct socket_wq *wq; |
2769 | ||
2770 | rcu_read_lock(); | |
2771 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2772 | if (skwq_has_sleeper(wq)) |
a9a08845 LT |
2773 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI | |
2774 | EPOLLRDNORM | EPOLLRDBAND); | |
8d8ad9d7 | 2775 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2776 | rcu_read_unlock(); |
1da177e4 LT |
2777 | } |
2778 | ||
2779 | static void sock_def_write_space(struct sock *sk) | |
2780 | { | |
43815482 ED |
2781 | struct socket_wq *wq; |
2782 | ||
2783 | rcu_read_lock(); | |
1da177e4 LT |
2784 | |
2785 | /* Do not wake up a writer until he can make "significant" | |
2786 | * progress. --DaveM | |
2787 | */ | |
14afee4b | 2788 | if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 | 2789 | wq = rcu_dereference(sk->sk_wq); |
1ce0bf50 | 2790 | if (skwq_has_sleeper(wq)) |
a9a08845 LT |
2791 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | |
2792 | EPOLLWRNORM | EPOLLWRBAND); | |
1da177e4 LT |
2793 | |
2794 | /* Should agree with poll, otherwise some programs break */ | |
2795 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2796 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2797 | } |
2798 | ||
43815482 | 2799 | rcu_read_unlock(); |
1da177e4 LT |
2800 | } |
2801 | ||
2802 | static void sock_def_destruct(struct sock *sk) | |
2803 | { | |
1da177e4 LT |
2804 | } |
2805 | ||
2806 | void sk_send_sigurg(struct sock *sk) | |
2807 | { | |
2808 | if (sk->sk_socket && sk->sk_socket->file) | |
2809 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2810 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2811 | } |
2a91525c | 2812 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2813 | |
2814 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2815 | unsigned long expires) | |
2816 | { | |
2817 | if (!mod_timer(timer, expires)) | |
2818 | sock_hold(sk); | |
2819 | } | |
1da177e4 LT |
2820 | EXPORT_SYMBOL(sk_reset_timer); |
2821 | ||
2822 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2823 | { | |
25cc4ae9 | 2824 | if (del_timer(timer)) |
1da177e4 LT |
2825 | __sock_put(sk); |
2826 | } | |
1da177e4 LT |
2827 | EXPORT_SYMBOL(sk_stop_timer); |
2828 | ||
2829 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2830 | { | |
581319c5 | 2831 | sk_init_common(sk); |
1da177e4 LT |
2832 | sk->sk_send_head = NULL; |
2833 | ||
99767f27 | 2834 | timer_setup(&sk->sk_timer, NULL, 0); |
4ec93edb | 2835 | |
1da177e4 LT |
2836 | sk->sk_allocation = GFP_KERNEL; |
2837 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2838 | sk->sk_sndbuf = sysctl_wmem_default; | |
2839 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2840 | sk_set_socket(sk, sock); |
1da177e4 LT |
2841 | |
2842 | sock_set_flag(sk, SOCK_ZAPPED); | |
2843 | ||
e71a4783 | 2844 | if (sock) { |
1da177e4 | 2845 | sk->sk_type = sock->type; |
c2f26e8f | 2846 | RCU_INIT_POINTER(sk->sk_wq, sock->wq); |
1da177e4 | 2847 | sock->sk = sk; |
86741ec2 LC |
2848 | sk->sk_uid = SOCK_INODE(sock)->i_uid; |
2849 | } else { | |
c2f26e8f | 2850 | RCU_INIT_POINTER(sk->sk_wq, NULL); |
86741ec2 LC |
2851 | sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); |
2852 | } | |
1da177e4 | 2853 | |
1da177e4 | 2854 | rwlock_init(&sk->sk_callback_lock); |
cdfbabfb DH |
2855 | if (sk->sk_kern_sock) |
2856 | lockdep_set_class_and_name( | |
2857 | &sk->sk_callback_lock, | |
2858 | af_kern_callback_keys + sk->sk_family, | |
2859 | af_family_kern_clock_key_strings[sk->sk_family]); | |
2860 | else | |
2861 | lockdep_set_class_and_name( | |
2862 | &sk->sk_callback_lock, | |
443aef0e PZ |
2863 | af_callback_keys + sk->sk_family, |
2864 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2865 | |
2866 | sk->sk_state_change = sock_def_wakeup; | |
2867 | sk->sk_data_ready = sock_def_readable; | |
2868 | sk->sk_write_space = sock_def_write_space; | |
2869 | sk->sk_error_report = sock_def_error_report; | |
2870 | sk->sk_destruct = sock_def_destruct; | |
2871 | ||
5640f768 ED |
2872 | sk->sk_frag.page = NULL; |
2873 | sk->sk_frag.offset = 0; | |
ef64a54f | 2874 | sk->sk_peek_off = -1; |
1da177e4 | 2875 | |
109f6e39 EB |
2876 | sk->sk_peer_pid = NULL; |
2877 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2878 | sk->sk_write_pending = 0; |
2879 | sk->sk_rcvlowat = 1; | |
2880 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2881 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2882 | ||
6c7c98ba | 2883 | sk->sk_stamp = SK_DEFAULT_STAMP; |
3a0ed3e9 DD |
2884 | #if BITS_PER_LONG==32 |
2885 | seqlock_init(&sk->sk_stamp_seq); | |
2886 | #endif | |
52267790 | 2887 | atomic_set(&sk->sk_zckey, 0); |
1da177e4 | 2888 | |
e0d1095a | 2889 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 2890 | sk->sk_napi_id = 0; |
64b0dc51 | 2891 | sk->sk_ll_usec = sysctl_net_busy_read; |
06021292 ET |
2892 | #endif |
2893 | ||
76a9ebe8 ED |
2894 | sk->sk_max_pacing_rate = ~0UL; |
2895 | sk->sk_pacing_rate = ~0UL; | |
3a9b76fd | 2896 | sk->sk_pacing_shift = 10; |
70da268b | 2897 | sk->sk_incoming_cpu = -1; |
c6345ce7 AN |
2898 | |
2899 | sk_rx_queue_clear(sk); | |
4dc6dc71 ED |
2900 | /* |
2901 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2902 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2903 | */ | |
2904 | smp_wmb(); | |
41c6d650 | 2905 | refcount_set(&sk->sk_refcnt, 1); |
33c732c3 | 2906 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2907 | } |
2a91525c | 2908 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2909 | |
b5606c2d | 2910 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2911 | { |
2912 | might_sleep(); | |
a5b5bb9a | 2913 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2914 | if (sk->sk_lock.owned) |
1da177e4 | 2915 | __lock_sock(sk); |
d2e9117c | 2916 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2917 | spin_unlock(&sk->sk_lock.slock); |
2918 | /* | |
2919 | * The sk_lock has mutex_lock() semantics here: | |
2920 | */ | |
fcc70d5f | 2921 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2922 | local_bh_enable(); |
1da177e4 | 2923 | } |
fcc70d5f | 2924 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2925 | |
b5606c2d | 2926 | void release_sock(struct sock *sk) |
1da177e4 | 2927 | { |
a5b5bb9a | 2928 | spin_lock_bh(&sk->sk_lock.slock); |
1da177e4 LT |
2929 | if (sk->sk_backlog.tail) |
2930 | __release_sock(sk); | |
46d3ceab | 2931 | |
c3f9b018 ED |
2932 | /* Warning : release_cb() might need to release sk ownership, |
2933 | * ie call sock_release_ownership(sk) before us. | |
2934 | */ | |
46d3ceab ED |
2935 | if (sk->sk_prot->release_cb) |
2936 | sk->sk_prot->release_cb(sk); | |
2937 | ||
c3f9b018 | 2938 | sock_release_ownership(sk); |
a5b5bb9a IM |
2939 | if (waitqueue_active(&sk->sk_lock.wq)) |
2940 | wake_up(&sk->sk_lock.wq); | |
2941 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2942 | } |
2943 | EXPORT_SYMBOL(release_sock); | |
2944 | ||
8a74ad60 ED |
2945 | /** |
2946 | * lock_sock_fast - fast version of lock_sock | |
2947 | * @sk: socket | |
2948 | * | |
2949 | * This version should be used for very small section, where process wont block | |
d651983d MCC |
2950 | * return false if fast path is taken: |
2951 | * | |
8a74ad60 | 2952 | * sk_lock.slock locked, owned = 0, BH disabled |
d651983d MCC |
2953 | * |
2954 | * return true if slow path is taken: | |
2955 | * | |
8a74ad60 ED |
2956 | * sk_lock.slock unlocked, owned = 1, BH enabled |
2957 | */ | |
2958 | bool lock_sock_fast(struct sock *sk) | |
2959 | { | |
2960 | might_sleep(); | |
2961 | spin_lock_bh(&sk->sk_lock.slock); | |
2962 | ||
2963 | if (!sk->sk_lock.owned) | |
2964 | /* | |
2965 | * Note : We must disable BH | |
2966 | */ | |
2967 | return false; | |
2968 | ||
2969 | __lock_sock(sk); | |
2970 | sk->sk_lock.owned = 1; | |
2971 | spin_unlock(&sk->sk_lock.slock); | |
2972 | /* | |
2973 | * The sk_lock has mutex_lock() semantics here: | |
2974 | */ | |
2975 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2976 | local_bh_enable(); | |
2977 | return true; | |
2978 | } | |
2979 | EXPORT_SYMBOL(lock_sock_fast); | |
2980 | ||
c7cbdbf2 AB |
2981 | int sock_gettstamp(struct socket *sock, void __user *userstamp, |
2982 | bool timeval, bool time32) | |
4ec93edb | 2983 | { |
c7cbdbf2 AB |
2984 | struct sock *sk = sock->sk; |
2985 | struct timespec64 ts; | |
9dae3497 YS |
2986 | |
2987 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); | |
c7cbdbf2 AB |
2988 | ts = ktime_to_timespec64(sock_read_timestamp(sk)); |
2989 | if (ts.tv_sec == -1) | |
1da177e4 | 2990 | return -ENOENT; |
c7cbdbf2 | 2991 | if (ts.tv_sec == 0) { |
3a0ed3e9 | 2992 | ktime_t kt = ktime_get_real(); |
c7cbdbf2 AB |
2993 | sock_write_timestamp(sk, kt);; |
2994 | ts = ktime_to_timespec64(kt); | |
b7aa0bf7 | 2995 | } |
1da177e4 | 2996 | |
c7cbdbf2 AB |
2997 | if (timeval) |
2998 | ts.tv_nsec /= 1000; | |
9dae3497 | 2999 | |
c7cbdbf2 AB |
3000 | #ifdef CONFIG_COMPAT_32BIT_TIME |
3001 | if (time32) | |
3002 | return put_old_timespec32(&ts, userstamp); | |
3003 | #endif | |
3004 | #ifdef CONFIG_SPARC64 | |
3005 | /* beware of padding in sparc64 timeval */ | |
3006 | if (timeval && !in_compat_syscall()) { | |
3007 | struct __kernel_old_timeval __user tv = { | |
c98f4822 SR |
3008 | .tv_sec = ts.tv_sec, |
3009 | .tv_usec = ts.tv_nsec, | |
c7cbdbf2 | 3010 | }; |
c98f4822 | 3011 | if (copy_to_user(userstamp, &tv, sizeof(tv))) |
c7cbdbf2 AB |
3012 | return -EFAULT; |
3013 | return 0; | |
ae40eb1e | 3014 | } |
c7cbdbf2 AB |
3015 | #endif |
3016 | return put_timespec64(&ts, userstamp); | |
ae40eb1e | 3017 | } |
c7cbdbf2 | 3018 | EXPORT_SYMBOL(sock_gettstamp); |
ae40eb1e | 3019 | |
20d49473 | 3020 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 3021 | { |
20d49473 | 3022 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
3023 | unsigned long previous_flags = sk->sk_flags; |
3024 | ||
20d49473 PO |
3025 | sock_set_flag(sk, flag); |
3026 | /* | |
3027 | * we just set one of the two flags which require net | |
3028 | * time stamping, but time stamping might have been on | |
3029 | * already because of the other one | |
3030 | */ | |
080a270f HFS |
3031 | if (sock_needs_netstamp(sk) && |
3032 | !(previous_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 3033 | net_enable_timestamp(); |
1da177e4 LT |
3034 | } |
3035 | } | |
1da177e4 | 3036 | |
cb820f8e RC |
3037 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
3038 | int level, int type) | |
3039 | { | |
3040 | struct sock_exterr_skb *serr; | |
364a9e93 | 3041 | struct sk_buff *skb; |
cb820f8e RC |
3042 | int copied, err; |
3043 | ||
3044 | err = -EAGAIN; | |
364a9e93 | 3045 | skb = sock_dequeue_err_skb(sk); |
cb820f8e RC |
3046 | if (skb == NULL) |
3047 | goto out; | |
3048 | ||
3049 | copied = skb->len; | |
3050 | if (copied > len) { | |
3051 | msg->msg_flags |= MSG_TRUNC; | |
3052 | copied = len; | |
3053 | } | |
51f3d02b | 3054 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
cb820f8e RC |
3055 | if (err) |
3056 | goto out_free_skb; | |
3057 | ||
3058 | sock_recv_timestamp(msg, sk, skb); | |
3059 | ||
3060 | serr = SKB_EXT_ERR(skb); | |
3061 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); | |
3062 | ||
3063 | msg->msg_flags |= MSG_ERRQUEUE; | |
3064 | err = copied; | |
3065 | ||
cb820f8e RC |
3066 | out_free_skb: |
3067 | kfree_skb(skb); | |
3068 | out: | |
3069 | return err; | |
3070 | } | |
3071 | EXPORT_SYMBOL(sock_recv_errqueue); | |
3072 | ||
1da177e4 LT |
3073 | /* |
3074 | * Get a socket option on an socket. | |
3075 | * | |
3076 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
3077 | * asynchronous errors should be reported by getsockopt. We assume | |
3078 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
3079 | */ | |
3080 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
3081 | char __user *optval, int __user *optlen) | |
3082 | { | |
3083 | struct sock *sk = sock->sk; | |
3084 | ||
3085 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
3086 | } | |
1da177e4 LT |
3087 | EXPORT_SYMBOL(sock_common_getsockopt); |
3088 | ||
3fdadf7d | 3089 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
3090 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
3091 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
3092 | { |
3093 | struct sock *sk = sock->sk; | |
3094 | ||
1e51f951 | 3095 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
3096 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
3097 | optval, optlen); | |
3fdadf7d DM |
3098 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
3099 | } | |
3100 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
3101 | #endif | |
3102 | ||
1b784140 YX |
3103 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
3104 | int flags) | |
1da177e4 LT |
3105 | { |
3106 | struct sock *sk = sock->sk; | |
3107 | int addr_len = 0; | |
3108 | int err; | |
3109 | ||
1b784140 | 3110 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
1da177e4 LT |
3111 | flags & ~MSG_DONTWAIT, &addr_len); |
3112 | if (err >= 0) | |
3113 | msg->msg_namelen = addr_len; | |
3114 | return err; | |
3115 | } | |
1da177e4 LT |
3116 | EXPORT_SYMBOL(sock_common_recvmsg); |
3117 | ||
3118 | /* | |
3119 | * Set socket options on an inet socket. | |
3120 | */ | |
3121 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 3122 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
3123 | { |
3124 | struct sock *sk = sock->sk; | |
3125 | ||
3126 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
3127 | } | |
1da177e4 LT |
3128 | EXPORT_SYMBOL(sock_common_setsockopt); |
3129 | ||
3fdadf7d | 3130 | #ifdef CONFIG_COMPAT |
543d9cfe | 3131 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 3132 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
3133 | { |
3134 | struct sock *sk = sock->sk; | |
3135 | ||
543d9cfe ACM |
3136 | if (sk->sk_prot->compat_setsockopt != NULL) |
3137 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
3138 | optval, optlen); | |
3fdadf7d DM |
3139 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
3140 | } | |
3141 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
3142 | #endif | |
3143 | ||
1da177e4 LT |
3144 | void sk_common_release(struct sock *sk) |
3145 | { | |
3146 | if (sk->sk_prot->destroy) | |
3147 | sk->sk_prot->destroy(sk); | |
3148 | ||
3149 | /* | |
3150 | * Observation: when sock_common_release is called, processes have | |
3151 | * no access to socket. But net still has. | |
3152 | * Step one, detach it from networking: | |
3153 | * | |
3154 | * A. Remove from hash tables. | |
3155 | */ | |
3156 | ||
3157 | sk->sk_prot->unhash(sk); | |
3158 | ||
3159 | /* | |
3160 | * In this point socket cannot receive new packets, but it is possible | |
3161 | * that some packets are in flight because some CPU runs receiver and | |
3162 | * did hash table lookup before we unhashed socket. They will achieve | |
3163 | * receive queue and will be purged by socket destructor. | |
3164 | * | |
3165 | * Also we still have packets pending on receive queue and probably, | |
3166 | * our own packets waiting in device queues. sock_destroy will drain | |
3167 | * receive queue, but transmitted packets will delay socket destruction | |
3168 | * until the last reference will be released. | |
3169 | */ | |
3170 | ||
3171 | sock_orphan(sk); | |
3172 | ||
3173 | xfrm_sk_free_policy(sk); | |
3174 | ||
e6848976 | 3175 | sk_refcnt_debug_release(sk); |
5640f768 | 3176 | |
1da177e4 LT |
3177 | sock_put(sk); |
3178 | } | |
1da177e4 LT |
3179 | EXPORT_SYMBOL(sk_common_release); |
3180 | ||
a2d133b1 JH |
3181 | void sk_get_meminfo(const struct sock *sk, u32 *mem) |
3182 | { | |
3183 | memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS); | |
3184 | ||
3185 | mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); | |
3186 | mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; | |
3187 | mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); | |
3188 | mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; | |
3189 | mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; | |
3190 | mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; | |
3191 | mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); | |
3192 | mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; | |
3193 | mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); | |
3194 | } | |
3195 | ||
13ff3d6f PE |
3196 | #ifdef CONFIG_PROC_FS |
3197 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
3198 | struct prot_inuse { |
3199 | int val[PROTO_INUSE_NR]; | |
3200 | }; | |
13ff3d6f PE |
3201 | |
3202 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 | 3203 | |
70ee1159 PE |
3204 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
3205 | { | |
08fc7f81 | 3206 | __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
3207 | } |
3208 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
3209 | ||
3210 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
3211 | { | |
3212 | int cpu, idx = prot->inuse_idx; | |
3213 | int res = 0; | |
3214 | ||
3215 | for_each_possible_cpu(cpu) | |
08fc7f81 | 3216 | res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx]; |
70ee1159 PE |
3217 | |
3218 | return res >= 0 ? res : 0; | |
3219 | } | |
3220 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
3221 | ||
648845ab TZ |
3222 | static void sock_inuse_add(struct net *net, int val) |
3223 | { | |
3224 | this_cpu_add(*net->core.sock_inuse, val); | |
3225 | } | |
3226 | ||
3227 | int sock_inuse_get(struct net *net) | |
3228 | { | |
3229 | int cpu, res = 0; | |
3230 | ||
3231 | for_each_possible_cpu(cpu) | |
3232 | res += *per_cpu_ptr(net->core.sock_inuse, cpu); | |
3233 | ||
3234 | return res; | |
3235 | } | |
3236 | ||
3237 | EXPORT_SYMBOL_GPL(sock_inuse_get); | |
3238 | ||
2c8c1e72 | 3239 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 | 3240 | { |
08fc7f81 | 3241 | net->core.prot_inuse = alloc_percpu(struct prot_inuse); |
648845ab TZ |
3242 | if (net->core.prot_inuse == NULL) |
3243 | return -ENOMEM; | |
3244 | ||
3245 | net->core.sock_inuse = alloc_percpu(int); | |
3246 | if (net->core.sock_inuse == NULL) | |
3247 | goto out; | |
3248 | ||
3249 | return 0; | |
3250 | ||
3251 | out: | |
3252 | free_percpu(net->core.prot_inuse); | |
3253 | return -ENOMEM; | |
70ee1159 PE |
3254 | } |
3255 | ||
2c8c1e72 | 3256 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 | 3257 | { |
08fc7f81 | 3258 | free_percpu(net->core.prot_inuse); |
648845ab | 3259 | free_percpu(net->core.sock_inuse); |
70ee1159 PE |
3260 | } |
3261 | ||
3262 | static struct pernet_operations net_inuse_ops = { | |
3263 | .init = sock_inuse_init_net, | |
3264 | .exit = sock_inuse_exit_net, | |
3265 | }; | |
3266 | ||
3267 | static __init int net_inuse_init(void) | |
3268 | { | |
3269 | if (register_pernet_subsys(&net_inuse_ops)) | |
3270 | panic("Cannot initialize net inuse counters"); | |
3271 | ||
3272 | return 0; | |
3273 | } | |
3274 | ||
3275 | core_initcall(net_inuse_init); | |
13ff3d6f PE |
3276 | |
3277 | static void assign_proto_idx(struct proto *prot) | |
3278 | { | |
3279 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
3280 | ||
3281 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 3282 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
3283 | return; |
3284 | } | |
3285 | ||
3286 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
3287 | } | |
3288 | ||
3289 | static void release_proto_idx(struct proto *prot) | |
3290 | { | |
3291 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
3292 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
3293 | } | |
3294 | #else | |
3295 | static inline void assign_proto_idx(struct proto *prot) | |
3296 | { | |
3297 | } | |
3298 | ||
3299 | static inline void release_proto_idx(struct proto *prot) | |
3300 | { | |
3301 | } | |
648845ab TZ |
3302 | |
3303 | static void sock_inuse_add(struct net *net, int val) | |
3304 | { | |
3305 | } | |
13ff3d6f PE |
3306 | #endif |
3307 | ||
0159dfd3 ED |
3308 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
3309 | { | |
3310 | if (!rsk_prot) | |
3311 | return; | |
3312 | kfree(rsk_prot->slab_name); | |
3313 | rsk_prot->slab_name = NULL; | |
adf78eda JL |
3314 | kmem_cache_destroy(rsk_prot->slab); |
3315 | rsk_prot->slab = NULL; | |
0159dfd3 ED |
3316 | } |
3317 | ||
3318 | static int req_prot_init(const struct proto *prot) | |
3319 | { | |
3320 | struct request_sock_ops *rsk_prot = prot->rsk_prot; | |
3321 | ||
3322 | if (!rsk_prot) | |
3323 | return 0; | |
3324 | ||
3325 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", | |
3326 | prot->name); | |
3327 | if (!rsk_prot->slab_name) | |
3328 | return -ENOMEM; | |
3329 | ||
3330 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, | |
3331 | rsk_prot->obj_size, 0, | |
e699e2c6 SB |
3332 | SLAB_ACCOUNT | prot->slab_flags, |
3333 | NULL); | |
0159dfd3 ED |
3334 | |
3335 | if (!rsk_prot->slab) { | |
3336 | pr_crit("%s: Can't create request sock SLAB cache!\n", | |
3337 | prot->name); | |
3338 | return -ENOMEM; | |
3339 | } | |
3340 | return 0; | |
3341 | } | |
3342 | ||
b733c007 PE |
3343 | int proto_register(struct proto *prot, int alloc_slab) |
3344 | { | |
1da177e4 | 3345 | if (alloc_slab) { |
30c2c9f1 DW |
3346 | prot->slab = kmem_cache_create_usercopy(prot->name, |
3347 | prot->obj_size, 0, | |
e699e2c6 SB |
3348 | SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT | |
3349 | prot->slab_flags, | |
289a4860 | 3350 | prot->useroffset, prot->usersize, |
271b72c7 | 3351 | NULL); |
1da177e4 LT |
3352 | |
3353 | if (prot->slab == NULL) { | |
e005d193 JP |
3354 | pr_crit("%s: Can't create sock SLAB cache!\n", |
3355 | prot->name); | |
60e7663d | 3356 | goto out; |
1da177e4 | 3357 | } |
2e6599cb | 3358 | |
0159dfd3 ED |
3359 | if (req_prot_init(prot)) |
3360 | goto out_free_request_sock_slab; | |
8feaf0c0 | 3361 | |
6d6ee43e | 3362 | if (prot->twsk_prot != NULL) { |
faf23422 | 3363 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 3364 | |
7e56b5d6 | 3365 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
3366 | goto out_free_request_sock_slab; |
3367 | ||
6d6ee43e | 3368 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 3369 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 3370 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 | 3371 | 0, |
e699e2c6 | 3372 | SLAB_ACCOUNT | |
52db70dc | 3373 | prot->slab_flags, |
20c2df83 | 3374 | NULL); |
6d6ee43e | 3375 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
3376 | goto out_free_timewait_sock_slab_name; |
3377 | } | |
1da177e4 LT |
3378 | } |
3379 | ||
36b77a52 | 3380 | mutex_lock(&proto_list_mutex); |
1da177e4 | 3381 | list_add(&prot->node, &proto_list); |
13ff3d6f | 3382 | assign_proto_idx(prot); |
36b77a52 | 3383 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
3384 | return 0; |
3385 | ||
8feaf0c0 | 3386 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 3387 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 | 3388 | out_free_request_sock_slab: |
0159dfd3 ED |
3389 | req_prot_cleanup(prot->rsk_prot); |
3390 | ||
2e6599cb ACM |
3391 | kmem_cache_destroy(prot->slab); |
3392 | prot->slab = NULL; | |
b733c007 PE |
3393 | out: |
3394 | return -ENOBUFS; | |
1da177e4 | 3395 | } |
1da177e4 LT |
3396 | EXPORT_SYMBOL(proto_register); |
3397 | ||
3398 | void proto_unregister(struct proto *prot) | |
3399 | { | |
36b77a52 | 3400 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 3401 | release_proto_idx(prot); |
0a3f4358 | 3402 | list_del(&prot->node); |
36b77a52 | 3403 | mutex_unlock(&proto_list_mutex); |
1da177e4 | 3404 | |
adf78eda JL |
3405 | kmem_cache_destroy(prot->slab); |
3406 | prot->slab = NULL; | |
1da177e4 | 3407 | |
0159dfd3 | 3408 | req_prot_cleanup(prot->rsk_prot); |
2e6599cb | 3409 | |
6d6ee43e | 3410 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 3411 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 3412 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 3413 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 3414 | } |
1da177e4 | 3415 | } |
1da177e4 LT |
3416 | EXPORT_SYMBOL(proto_unregister); |
3417 | ||
bf2ae2e4 XL |
3418 | int sock_load_diag_module(int family, int protocol) |
3419 | { | |
3420 | if (!protocol) { | |
3421 | if (!sock_is_registered(family)) | |
3422 | return -ENOENT; | |
3423 | ||
3424 | return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
3425 | NETLINK_SOCK_DIAG, family); | |
3426 | } | |
3427 | ||
3428 | #ifdef CONFIG_INET | |
3429 | if (family == AF_INET && | |
c34c1287 | 3430 | protocol != IPPROTO_RAW && |
bf2ae2e4 XL |
3431 | !rcu_access_pointer(inet_protos[protocol])) |
3432 | return -ENOENT; | |
3433 | #endif | |
3434 | ||
3435 | return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, | |
3436 | NETLINK_SOCK_DIAG, family, protocol); | |
3437 | } | |
3438 | EXPORT_SYMBOL(sock_load_diag_module); | |
3439 | ||
1da177e4 | 3440 | #ifdef CONFIG_PROC_FS |
1da177e4 | 3441 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 3442 | __acquires(proto_list_mutex) |
1da177e4 | 3443 | { |
36b77a52 | 3444 | mutex_lock(&proto_list_mutex); |
60f0438a | 3445 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
3446 | } |
3447 | ||
3448 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3449 | { | |
60f0438a | 3450 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
3451 | } |
3452 | ||
3453 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 3454 | __releases(proto_list_mutex) |
1da177e4 | 3455 | { |
36b77a52 | 3456 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
3457 | } |
3458 | ||
3459 | static char proto_method_implemented(const void *method) | |
3460 | { | |
3461 | return method == NULL ? 'n' : 'y'; | |
3462 | } | |
180d8cd9 GC |
3463 | static long sock_prot_memory_allocated(struct proto *proto) |
3464 | { | |
cb75a36c | 3465 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
3466 | } |
3467 | ||
3468 | static char *sock_prot_memory_pressure(struct proto *proto) | |
3469 | { | |
3470 | return proto->memory_pressure != NULL ? | |
3471 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
3472 | } | |
1da177e4 LT |
3473 | |
3474 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
3475 | { | |
180d8cd9 | 3476 | |
8d987e5c | 3477 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
3478 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
3479 | proto->name, | |
3480 | proto->obj_size, | |
14e943db | 3481 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
3482 | sock_prot_memory_allocated(proto), |
3483 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
3484 | proto->max_header, |
3485 | proto->slab == NULL ? "no" : "yes", | |
3486 | module_name(proto->owner), | |
3487 | proto_method_implemented(proto->close), | |
3488 | proto_method_implemented(proto->connect), | |
3489 | proto_method_implemented(proto->disconnect), | |
3490 | proto_method_implemented(proto->accept), | |
3491 | proto_method_implemented(proto->ioctl), | |
3492 | proto_method_implemented(proto->init), | |
3493 | proto_method_implemented(proto->destroy), | |
3494 | proto_method_implemented(proto->shutdown), | |
3495 | proto_method_implemented(proto->setsockopt), | |
3496 | proto_method_implemented(proto->getsockopt), | |
3497 | proto_method_implemented(proto->sendmsg), | |
3498 | proto_method_implemented(proto->recvmsg), | |
3499 | proto_method_implemented(proto->sendpage), | |
3500 | proto_method_implemented(proto->bind), | |
3501 | proto_method_implemented(proto->backlog_rcv), | |
3502 | proto_method_implemented(proto->hash), | |
3503 | proto_method_implemented(proto->unhash), | |
3504 | proto_method_implemented(proto->get_port), | |
3505 | proto_method_implemented(proto->enter_memory_pressure)); | |
3506 | } | |
3507 | ||
3508 | static int proto_seq_show(struct seq_file *seq, void *v) | |
3509 | { | |
60f0438a | 3510 | if (v == &proto_list) |
1da177e4 LT |
3511 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
3512 | "protocol", | |
3513 | "size", | |
3514 | "sockets", | |
3515 | "memory", | |
3516 | "press", | |
3517 | "maxhdr", | |
3518 | "slab", | |
3519 | "module", | |
3520 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
3521 | else | |
60f0438a | 3522 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
3523 | return 0; |
3524 | } | |
3525 | ||
f690808e | 3526 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
3527 | .start = proto_seq_start, |
3528 | .next = proto_seq_next, | |
3529 | .stop = proto_seq_stop, | |
3530 | .show = proto_seq_show, | |
3531 | }; | |
3532 | ||
14e943db ED |
3533 | static __net_init int proto_init_net(struct net *net) |
3534 | { | |
c3506372 CH |
3535 | if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops, |
3536 | sizeof(struct seq_net_private))) | |
14e943db ED |
3537 | return -ENOMEM; |
3538 | ||
3539 | return 0; | |
3540 | } | |
3541 | ||
3542 | static __net_exit void proto_exit_net(struct net *net) | |
3543 | { | |
ece31ffd | 3544 | remove_proc_entry("protocols", net->proc_net); |
14e943db ED |
3545 | } |
3546 | ||
3547 | ||
3548 | static __net_initdata struct pernet_operations proto_net_ops = { | |
3549 | .init = proto_init_net, | |
3550 | .exit = proto_exit_net, | |
1da177e4 LT |
3551 | }; |
3552 | ||
3553 | static int __init proto_init(void) | |
3554 | { | |
14e943db | 3555 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
3556 | } |
3557 | ||
3558 | subsys_initcall(proto_init); | |
3559 | ||
3560 | #endif /* PROC_FS */ | |
7db6b048 SS |
3561 | |
3562 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
3563 | bool sk_busy_loop_end(void *p, unsigned long start_time) | |
3564 | { | |
3565 | struct sock *sk = p; | |
3566 | ||
3567 | return !skb_queue_empty(&sk->sk_receive_queue) || | |
3568 | sk_busy_loop_timeout(sk, start_time); | |
3569 | } | |
3570 | EXPORT_SYMBOL(sk_busy_loop_end); | |
3571 | #endif /* CONFIG_NET_RX_BUSY_POLL */ |