| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * Generic socket support routines. Memory allocators, socket lock/release |
| * handler for protocols to use and generic option handler. |
| * |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * Florian La Roche, <flla@stud.uni-sb.de> |
| * Alan Cox, <A.Cox@swansea.ac.uk> |
| * |
| * Fixes: |
| * Alan Cox : Numerous verify_area() problems |
| * Alan Cox : Connecting on a connecting socket |
| * now returns an error for tcp. |
| * Alan Cox : sock->protocol is set correctly. |
| * and is not sometimes left as 0. |
| * Alan Cox : connect handles icmp errors on a |
| * connect properly. Unfortunately there |
| * is a restart syscall nasty there. I |
| * can't match BSD without hacking the C |
| * library. Ideas urgently sought! |
| * Alan Cox : Disallow bind() to addresses that are |
| * not ours - especially broadcast ones!! |
| * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) |
| * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, |
| * instead they leave that for the DESTROY timer. |
| * Alan Cox : Clean up error flag in accept |
| * Alan Cox : TCP ack handling is buggy, the DESTROY timer |
| * was buggy. Put a remove_sock() in the handler |
| * for memory when we hit 0. Also altered the timer |
| * code. The ACK stuff can wait and needs major |
| * TCP layer surgery. |
| * Alan Cox : Fixed TCP ack bug, removed remove sock |
| * and fixed timer/inet_bh race. |
| * Alan Cox : Added zapped flag for TCP |
| * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code |
| * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb |
| * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources |
| * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. |
| * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... |
| * Rick Sladkey : Relaxed UDP rules for matching packets. |
| * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support |
| * Pauline Middelink : identd support |
| * Alan Cox : Fixed connect() taking signals I think. |
| * Alan Cox : SO_LINGER supported |
| * Alan Cox : Error reporting fixes |
| * Anonymous : inet_create tidied up (sk->reuse setting) |
| * Alan Cox : inet sockets don't set sk->type! |
| * Alan Cox : Split socket option code |
| * Alan Cox : Callbacks |
| * Alan Cox : Nagle flag for Charles & Johannes stuff |
| * Alex : Removed restriction on inet fioctl |
| * Alan Cox : Splitting INET from NET core |
| * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() |
| * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code |
| * Alan Cox : Split IP from generic code |
| * Alan Cox : New kfree_skbmem() |
| * Alan Cox : Make SO_DEBUG superuser only. |
| * Alan Cox : Allow anyone to clear SO_DEBUG |
| * (compatibility fix) |
| * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. |
| * Alan Cox : Allocator for a socket is settable. |
| * Alan Cox : SO_ERROR includes soft errors. |
| * Alan Cox : Allow NULL arguments on some SO_ opts |
| * Alan Cox : Generic socket allocation to make hooks |
| * easier (suggested by Craig Metz). |
| * Michael Pall : SO_ERROR returns positive errno again |
| * Steve Whitehouse: Added default destructor to free |
| * protocol private data. |
| * Steve Whitehouse: Added various other default routines |
| * common to several socket families. |
| * Chris Evans : Call suser() check last on F_SETOWN |
| * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. |
| * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() |
| * Andi Kleen : Fix write_space callback |
| * Chris Evans : Security fixes - signedness again |
| * Arnaldo C. Melo : cleanups, use skb_queue_purge |
| * |
| * To Fix: |
| * |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/capability.h> |
| #include <linux/errno.h> |
| #include <linux/errqueue.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/sched.h> |
| #include <linux/timer.h> |
| #include <linux/string.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <linux/mm.h> |
| #include <linux/slab.h> |
| #include <linux/interrupt.h> |
| #include <linux/poll.h> |
| #include <linux/tcp.h> |
| #include <linux/init.h> |
| #include <linux/highmem.h> |
| #include <linux/user_namespace.h> |
| #include <linux/static_key.h> |
| #include <linux/memcontrol.h> |
| #include <linux/prefetch.h> |
| |
| #include <asm/uaccess.h> |
| |
| #include <linux/netdevice.h> |
| #include <net/protocol.h> |
| #include <linux/skbuff.h> |
| #include <net/net_namespace.h> |
| #include <net/request_sock.h> |
| #include <net/sock.h> |
| #include <linux/net_tstamp.h> |
| #include <net/xfrm.h> |
| #include <linux/ipsec.h> |
| #include <net/cls_cgroup.h> |
| #include <net/netprio_cgroup.h> |
| #include <linux/sock_diag.h> |
| |
| #include <linux/filter.h> |
| |
| #include <trace/events/sock.h> |
| |
| #ifdef CONFIG_INET |
| #include <net/tcp.h> |
| #endif |
| |
| #include <net/busy_poll.h> |
| |
| static DEFINE_MUTEX(proto_list_mutex); |
| static LIST_HEAD(proto_list); |
| |
| /** |
| * sk_ns_capable - General socket capability test |
| * @sk: Socket to use a capability on or through |
| * @user_ns: The user namespace of the capability to use |
| * @cap: The capability to use |
| * |
| * Test to see if the opener of the socket had when the socket was |
| * created and the current process has the capability @cap in the user |
| * namespace @user_ns. |
| */ |
| bool sk_ns_capable(const struct sock *sk, |
| struct user_namespace *user_ns, int cap) |
| { |
| return file_ns_capable(sk->sk_socket->file, user_ns, cap) && |
| ns_capable(user_ns, cap); |
| } |
| EXPORT_SYMBOL(sk_ns_capable); |
| |
| /** |
| * sk_capable - Socket global capability test |
| * @sk: Socket to use a capability on or through |
| * @cap: The global capability to use |
| * |
| * Test to see if the opener of the socket had when the socket was |
| * created and the current process has the capability @cap in all user |
| * namespaces. |
| */ |
| bool sk_capable(const struct sock *sk, int cap) |
| { |
| return sk_ns_capable(sk, &init_user_ns, cap); |
| } |
| EXPORT_SYMBOL(sk_capable); |
| |
| /** |
| * sk_net_capable - Network namespace socket capability test |
| * @sk: Socket to use a capability on or through |
| * @cap: The capability to use |
| * |
| * Test to see if the opener of the socket had when the socket was created |
| * and the current process has the capability @cap over the network namespace |
| * the socket is a member of. |
| */ |
| bool sk_net_capable(const struct sock *sk, int cap) |
| { |
| return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); |
| } |
| EXPORT_SYMBOL(sk_net_capable); |
| |
| |
| #ifdef CONFIG_MEMCG_KMEM |
| int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) |
| { |
| struct proto *proto; |
| int ret = 0; |
| |
| mutex_lock(&proto_list_mutex); |
| list_for_each_entry(proto, &proto_list, node) { |
| if (proto->init_cgroup) { |
| ret = proto->init_cgroup(memcg, ss); |
| if (ret) |
| goto out; |
| } |
| } |
| |
| mutex_unlock(&proto_list_mutex); |
| return ret; |
| out: |
| list_for_each_entry_continue_reverse(proto, &proto_list, node) |
| if (proto->destroy_cgroup) |
| proto->destroy_cgroup(memcg); |
| mutex_unlock(&proto_list_mutex); |
| return ret; |
| } |
| |
| void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
| { |
| struct proto *proto; |
| |
| mutex_lock(&proto_list_mutex); |
| list_for_each_entry_reverse(proto, &proto_list, node) |
| if (proto->destroy_cgroup) |
| proto->destroy_cgroup(memcg); |
| mutex_unlock(&proto_list_mutex); |
| } |
| #endif |
| |
| /* |
| * Each address family might have different locking rules, so we have |
| * one slock key per address family: |
| */ |
| static struct lock_class_key af_family_keys[AF_MAX]; |
| static struct lock_class_key af_family_slock_keys[AF_MAX]; |
| |
| #if defined(CONFIG_MEMCG_KMEM) |
| struct static_key memcg_socket_limit_enabled; |
| EXPORT_SYMBOL(memcg_socket_limit_enabled); |
| #endif |
| |
| /* |
| * Make lock validator output more readable. (we pre-construct these |
| * strings build-time, so that runtime initialization of socket |
| * locks is fast): |
| */ |
| static const char *const af_family_key_strings[AF_MAX+1] = { |
| "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
| "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", |
| "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , |
| "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , |
| "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , |
| "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , |
| "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , |
| "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
| "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
| "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
| "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
| "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
| "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
| "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX" |
| }; |
| static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
| "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
| "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", |
| "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , |
| "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , |
| "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , |
| "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , |
| "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , |
| "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
| "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
| "slock-27" , "slock-28" , "slock-AF_CAN" , |
| "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
| "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
| "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
| "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX" |
| }; |
| static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
| "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
| "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", |
| "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , |
| "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , |
| "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , |
| "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , |
| "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , |
| "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
| "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
| "clock-27" , "clock-28" , "clock-AF_CAN" , |
| "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
| "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
| "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
| "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX" |
| }; |
| |
| /* |
| * sk_callback_lock locking rules are per-address-family, |
| * so split the lock classes by using a per-AF key: |
| */ |
| static struct lock_class_key af_callback_keys[AF_MAX]; |
| |
| /* Take into consideration the size of the struct sk_buff overhead in the |
| * determination of these values, since that is non-constant across |
| * platforms. This makes socket queueing behavior and performance |
| * not depend upon such differences. |
| */ |
| #define _SK_MEM_PACKETS 256 |
| #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
| #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| |
| /* Run time adjustable parameters. */ |
| __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
| EXPORT_SYMBOL(sysctl_wmem_max); |
| __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
| EXPORT_SYMBOL(sysctl_rmem_max); |
| __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
| __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; |
| |
| /* Maximal space eaten by iovec or ancillary data plus some space */ |
| int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
| EXPORT_SYMBOL(sysctl_optmem_max); |
| |
| int sysctl_tstamp_allow_data __read_mostly = 1; |
| |
| struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
| EXPORT_SYMBOL_GPL(memalloc_socks); |
| |
| /** |
| * sk_set_memalloc - sets %SOCK_MEMALLOC |
| * @sk: socket to set it on |
| * |
| * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. |
| * It's the responsibility of the admin to adjust min_free_kbytes |
| * to meet the requirements |
| */ |
| void sk_set_memalloc(struct sock *sk) |
| { |
| sock_set_flag(sk, SOCK_MEMALLOC); |
| sk->sk_allocation |= __GFP_MEMALLOC; |
| static_key_slow_inc(&memalloc_socks); |
| } |
| EXPORT_SYMBOL_GPL(sk_set_memalloc); |
| |
| void sk_clear_memalloc(struct sock *sk) |
| { |
| sock_reset_flag(sk, SOCK_MEMALLOC); |
| sk->sk_allocation &= ~__GFP_MEMALLOC; |
| static_key_slow_dec(&memalloc_socks); |
| |
| /* |
| * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward |
| * progress of swapping. SOCK_MEMALLOC may be cleared while |
| * it has rmem allocations due to the last swapfile being deactivated |
| * but there is a risk that the socket is unusable due to exceeding |
| * the rmem limits. Reclaim the reserves and obey rmem limits again. |
| */ |
| sk_mem_reclaim(sk); |
| } |
| EXPORT_SYMBOL_GPL(sk_clear_memalloc); |
| |
| int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
| { |
| int ret; |
| unsigned long pflags = current->flags; |
| |
| /* these should have been dropped before queueing */ |
| BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); |
| |
| current->flags |= PF_MEMALLOC; |
| ret = sk->sk_backlog_rcv(sk, skb); |
| tsk_restore_flags(current, pflags, PF_MEMALLOC); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(__sk_backlog_rcv); |
| |
| static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
| { |
| struct timeval tv; |
| |
| if (optlen < sizeof(tv)) |
| return -EINVAL; |
| if (copy_from_user(&tv, optval, sizeof(tv))) |
| return -EFAULT; |
| if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
| return -EDOM; |
| |
| if (tv.tv_sec < 0) { |
| static int warned __read_mostly; |
| |
| *timeo_p = 0; |
| if (warned < 10 && net_ratelimit()) { |
| warned++; |
| pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
| __func__, current->comm, task_pid_nr(current)); |
| } |
| return 0; |
| } |
| *timeo_p = MAX_SCHEDULE_TIMEOUT; |
| if (tv.tv_sec == 0 && tv.tv_usec == 0) |
| return 0; |
| if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) |
| *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); |
| return 0; |
| } |
| |
| static void sock_warn_obsolete_bsdism(const char *name) |
| { |
| static int warned; |
| static char warncomm[TASK_COMM_LEN]; |
| if (strcmp(warncomm, current->comm) && warned < 5) { |
| strcpy(warncomm, current->comm); |
| pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
| warncomm, name); |
| warned++; |
| } |
| } |
| |
| static bool sock_needs_netstamp(const struct sock *sk) |
| { |
| switch (sk->sk_family) { |
| case AF_UNSPEC: |
| case AF_UNIX: |
| return false; |
| default: |
| return true; |
| } |
| } |
| |
| static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
| { |
| if (sk->sk_flags & flags) { |
| sk->sk_flags &= ~flags; |
| if (sock_needs_netstamp(sk) && |
| !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) |
| net_disable_timestamp(); |
| } |
| } |
| |
| |
| int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| { |
| int err; |
| unsigned long flags; |
| struct sk_buff_head *list = &sk->sk_receive_queue; |
| |
| if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
| atomic_inc(&sk->sk_drops); |
| trace_sock_rcvqueue_full(sk, skb); |
| return -ENOMEM; |
| } |
| |
| err = sk_filter(sk, skb); |
| if (err) |
| return err; |
| |
| if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
| atomic_inc(&sk->sk_drops); |
| return -ENOBUFS; |
| } |
| |
| skb->dev = NULL; |
| skb_set_owner_r(skb, sk); |
| |
| /* we escape from rcu protected region, make sure we dont leak |
| * a norefcounted dst |
| */ |
| skb_dst_force(skb); |
| |
| spin_lock_irqsave(&list->lock, flags); |
| sock_skb_set_dropcount(sk, skb); |
| __skb_queue_tail(list, skb); |
| spin_unlock_irqrestore(&list->lock, flags); |
| |
| if (!sock_flag(sk, SOCK_DEAD)) |
| sk->sk_data_ready(sk); |
| return 0; |
| } |
| EXPORT_SYMBOL(sock_queue_rcv_skb); |
| |
| int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
| { |
| int rc = NET_RX_SUCCESS; |
| |
| if (sk_filter(sk, skb)) |
| goto discard_and_relse; |
| |
| skb->dev = NULL; |
| |
| if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
| atomic_inc(&sk->sk_drops); |
| goto discard_and_relse; |
| } |
| if (nested) |
| bh_lock_sock_nested(sk); |
| else |
| bh_lock_sock(sk); |
| if (!sock_owned_by_user(sk)) { |
| /* |
| * trylock + unlock semantics: |
| */ |
| mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); |
| |
| rc = sk_backlog_rcv(sk, skb); |
| |
| mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
| } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
| bh_unlock_sock(sk); |
| atomic_inc(&sk->sk_drops); |
| goto discard_and_relse; |
| } |
| |
| bh_unlock_sock(sk); |
| out: |
| sock_put(sk); |
| return rc; |
| discard_and_relse: |
| kfree_skb(skb); |
| goto out; |
| } |
| EXPORT_SYMBOL(sk_receive_skb); |
| |
| struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
| { |
| struct dst_entry *dst = __sk_dst_get(sk); |
| |
| if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
| sk_tx_queue_clear(sk); |
| RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
| dst_release(dst); |
| return NULL; |
| } |
| |
| return dst; |
| } |
| EXPORT_SYMBOL(__sk_dst_check); |
| |
| struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) |
| { |
| struct dst_entry *dst = sk_dst_get(sk); |
| |
| if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
| sk_dst_reset(sk); |
| dst_release(dst); |
| return NULL; |
| } |
| |
| return dst; |
| } |
| EXPORT_SYMBOL(sk_dst_check); |
| |
| static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
| int optlen) |
| { |
| int ret = -ENOPROTOOPT; |
| #ifdef CONFIG_NETDEVICES |
| struct net *net = sock_net(sk); |
| char devname[IFNAMSIZ]; |
| int index; |
| |
| /* Sorry... */ |
| ret = -EPERM; |
| if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
| goto out; |
| |
| ret = -EINVAL; |
| if (optlen < 0) |
| goto out; |
| |
| /* Bind this socket to a particular device like "eth0", |
| * as specified in the passed interface name. If the |
| * name is "" or the option length is zero the socket |
| * is not bound. |
| */ |
| if (optlen > IFNAMSIZ - 1) |
| optlen = IFNAMSIZ - 1; |
| memset(devname, 0, sizeof(devname)); |
| |
| ret = -EFAULT; |
| if (copy_from_user(devname, optval, optlen)) |
| goto out; |
| |
| index = 0; |
| if (devname[0] != '\0') { |
| struct net_device *dev; |
| |
| rcu_read_lock(); |
| dev = dev_get_by_name_rcu(net, devname); |
| if (dev) |
| index = dev->ifindex; |
| rcu_read_unlock(); |
| ret = -ENODEV; |
| if (!dev) |
| goto out; |
| } |
| |
| lock_sock(sk); |
| sk->sk_bound_dev_if = index; |
| sk_dst_reset(sk); |
| release_sock(sk); |
| |
| ret = 0; |
| |
| out: |
| #endif |
| |
| return ret; |
| } |
| |
| static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
| int __user *optlen, int len) |
| { |
| int ret = -ENOPROTOOPT; |
| #ifdef CONFIG_NETDEVICES |
| struct net *net = sock_net(sk); |
| char devname[IFNAMSIZ]; |
| |
| if (sk->sk_bound_dev_if == 0) { |
| len = 0; |
| goto zero; |
| } |
| |
| ret = -EINVAL; |
| if (len < IFNAMSIZ) |
| goto out; |
| |
| ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
| if (ret) |
| goto out; |
| |
| len = strlen(devname) + 1; |
| |
| ret = -EFAULT; |
| if (copy_to_user(optval, devname, len)) |
| goto out; |
| |
| zero: |
| ret = -EFAULT; |
| if (put_user(len, optlen)) |
| goto out; |
| |
| ret = 0; |
| |
| out: |
| #endif |
| |
| return ret; |
| } |
| |
| static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
| { |
| if (valbool) |
| sock_set_flag(sk, bit); |
| else |
| sock_reset_flag(sk, bit); |
| } |
| |
| bool sk_mc_loop(struct sock *sk) |
| { |
| if (dev_recursion_level()) |
| return false; |
| if (!sk) |
| return true; |
| switch (sk->sk_family) { |
| case AF_INET: |
| return inet_sk(sk)->mc_loop; |
| #if IS_ENABLED(CONFIG_IPV6) |
| case AF_INET6: |
| return inet6_sk(sk)->mc_loop; |
| #endif |
| } |
| WARN_ON(1); |
| return true; |
| } |
| EXPORT_SYMBOL(sk_mc_loop); |
| |
| /* |
| * This is meant for all protocols to use and covers goings on |
| * at the socket level. Everything here is generic. |
| */ |
| |
| int sock_setsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| struct sock *sk = sock->sk; |
| int val; |
| int valbool; |
| struct linger ling; |
| int ret = 0; |
| |
| /* |
| * Options without arguments |
| */ |
| |
| if (optname == SO_BINDTODEVICE) |
| return sock_setbindtodevice(sk, optval, optlen); |
| |
| if (optlen < sizeof(int)) |
| return -EINVAL; |
| |
| if (get_user(val, (int __user *)optval)) |
| return -EFAULT; |
| |
| valbool = val ? 1 : 0; |
| |
| lock_sock(sk); |
| |
| switch (optname) { |
| case SO_DEBUG: |
| if (val && !capable(CAP_NET_ADMIN)) |
| ret = -EACCES; |
| else |
| sock_valbool_flag(sk, SOCK_DBG, valbool); |
| break; |
| case SO_REUSEADDR: |
| sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
| break; |
| case SO_REUSEPORT: |
| sk->sk_reuseport = valbool; |
| break; |
| case SO_TYPE: |
| case SO_PROTOCOL: |
| case SO_DOMAIN: |
| case SO_ERROR: |
| ret = -ENOPROTOOPT; |
| break; |
| case SO_DONTROUTE: |
| sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
| break; |
| case SO_BROADCAST: |
| sock_valbool_flag(sk, SOCK_BROADCAST, valbool); |
| break; |
| case SO_SNDBUF: |
| /* Don't error on this BSD doesn't and if you think |
| * about it this is right. Otherwise apps have to |
| * play 'guess the biggest size' games. RCVBUF/SNDBUF |
| * are treated in BSD as hints |
| */ |
| val = min_t(u32, val, sysctl_wmem_max); |
| set_sndbuf: |
| sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); |
| /* Wake up sending tasks if we upped the value. */ |
| sk->sk_write_space(sk); |
| break; |
| |
| case SO_SNDBUFFORCE: |
| if (!capable(CAP_NET_ADMIN)) { |
| ret = -EPERM; |
| break; |
| } |
| goto set_sndbuf; |
| |
| case SO_RCVBUF: |
| /* Don't error on this BSD doesn't and if you think |
| * about it this is right. Otherwise apps have to |
| * play 'guess the biggest size' games. RCVBUF/SNDBUF |
| * are treated in BSD as hints |
| */ |
| val = min_t(u32, val, sysctl_rmem_max); |
| set_rcvbuf: |
| sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| /* |
| * We double it on the way in to account for |
| * "struct sk_buff" etc. overhead. Applications |
| * assume that the SO_RCVBUF setting they make will |
| * allow that much actual data to be received on that |
| * socket. |
| * |
| * Applications are unaware that "struct sk_buff" and |
| * other overheads allocate from the receive buffer |
| * during socket buffer allocation. |
| * |
| * And after considering the possible alternatives, |
| * returning the value we actually used in getsockopt |
| * is the most desirable behavior. |
| */ |
| sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); |
| break; |
| |
| case SO_RCVBUFFORCE: |
| if (!capable(CAP_NET_ADMIN)) { |
| ret = -EPERM; |
| break; |
| } |
| goto set_rcvbuf; |
| |
| case SO_KEEPALIVE: |
| #ifdef CONFIG_INET |
| if (sk->sk_protocol == IPPROTO_TCP && |
| sk->sk_type == SOCK_STREAM) |
| tcp_set_keepalive(sk, valbool); |
| #endif |
| sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
| break; |
| |
| case SO_OOBINLINE: |
| sock_valbool_flag(sk, SOCK_URGINLINE, valbool); |
| break; |
| |
| case SO_NO_CHECK: |
| sk->sk_no_check_tx = valbool; |
| break; |
| |
| case SO_PRIORITY: |
| if ((val >= 0 && val <= 6) || |
| ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
| sk->sk_priority = val; |
| else |
| ret = -EPERM; |
| break; |
| |
| case SO_LINGER: |
| if (optlen < sizeof(ling)) { |
| ret = -EINVAL; /* 1003.1g */ |
| break; |
| } |
| if (copy_from_user(&ling, optval, sizeof(ling))) { |
| ret = -EFAULT; |
| break; |
| } |
| if (!ling.l_onoff) |
| sock_reset_flag(sk, SOCK_LINGER); |
| else { |
| #if (BITS_PER_LONG == 32) |
| if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
| sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; |
| else |
| #endif |
| sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; |
| sock_set_flag(sk, SOCK_LINGER); |
| } |
| break; |
| |
| case SO_BSDCOMPAT: |
| sock_warn_obsolete_bsdism("setsockopt"); |
| break; |
| |
| case SO_PASSCRED: |
| if (valbool) |
| set_bit(SOCK_PASSCRED, &sock->flags); |
| else |
| clear_bit(SOCK_PASSCRED, &sock->flags); |
| break; |
| |
| case SO_TIMESTAMP: |
| case SO_TIMESTAMPNS: |
| if (valbool) { |
| if (optname == SO_TIMESTAMP) |
| sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| else |
| sock_set_flag(sk, SOCK_RCVTSTAMPNS); |
| sock_set_flag(sk, SOCK_RCVTSTAMP); |
| sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
| } else { |
| sock_reset_flag(sk, SOCK_RCVTSTAMP); |
| sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| } |
| break; |
| |
| case SO_TIMESTAMPING: |
| if (val & ~SOF_TIMESTAMPING_MASK) { |
| ret = -EINVAL; |
| break; |
| } |
| |
| if (val & SOF_TIMESTAMPING_OPT_ID && |
| !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
| if (sk->sk_protocol == IPPROTO_TCP && |
| sk->sk_type == SOCK_STREAM) { |
| if (sk->sk_state != TCP_ESTABLISHED) { |
| ret = -EINVAL; |
| break; |
| } |
| sk->sk_tskey = tcp_sk(sk)->snd_una; |
| } else { |
| sk->sk_tskey = 0; |
| } |
| } |
| sk->sk_tsflags = val; |
| if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
| sock_enable_timestamp(sk, |
| SOCK_TIMESTAMPING_RX_SOFTWARE); |
| else |
| sock_disable_timestamp(sk, |
| (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
| break; |
| |
| case SO_RCVLOWAT: |
| if (val < 0) |
| val = INT_MAX; |
| sk->sk_rcvlowat = val ? : 1; |
| break; |
| |
| case SO_RCVTIMEO: |
| ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); |
| break; |
| |
| case SO_SNDTIMEO: |
| ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); |
| break; |
| |
| case SO_ATTACH_FILTER: |
| ret = -EINVAL; |
| if (optlen == sizeof(struct sock_fprog)) { |
| struct sock_fprog fprog; |
| |
| ret = -EFAULT; |
| if (copy_from_user(&fprog, optval, sizeof(fprog))) |
| break; |
| |
| ret = sk_attach_filter(&fprog, sk); |
| } |
| break; |
| |
| case SO_ATTACH_BPF: |
| ret = -EINVAL; |
| if (optlen == sizeof(u32)) { |
| u32 ufd; |
| |
| ret = -EFAULT; |
| if (copy_from_user(&ufd, optval, sizeof(ufd))) |
| break; |
| |
| ret = sk_attach_bpf(ufd, sk); |
| } |
| break; |
| |
| case SO_DETACH_FILTER: |
| ret = sk_detach_filter(sk); |
| break; |
| |
| case SO_LOCK_FILTER: |
| if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) |
| ret = -EPERM; |
| else |
| sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); |
| break; |
| |
| case SO_PASSSEC: |
| if (valbool) |
| set_bit(SOCK_PASSSEC, &sock->flags); |
| else |
| clear_bit(SOCK_PASSSEC, &sock->flags); |
| break; |
| case SO_MARK: |
| if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
| ret = -EPERM; |
| else |
| sk->sk_mark = val; |
| break; |
| |
| case SO_RXQ_OVFL: |
| sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
| break; |
| |
| case SO_WIFI_STATUS: |
| sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); |
| break; |
| |
| case SO_PEEK_OFF: |
| if (sock->ops->set_peek_off) |
| ret = sock->ops->set_peek_off(sk, val); |
| else |
| ret = -EOPNOTSUPP; |
| break; |
| |
| case SO_NOFCS: |
| sock_valbool_flag(sk, SOCK_NOFCS, valbool); |
| break; |
| |
| case SO_SELECT_ERR_QUEUE: |
| sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); |
| break; |
| |
| #ifdef CONFIG_NET_RX_BUSY_POLL |
| case SO_BUSY_POLL: |
| /* allow unprivileged users to decrease the value */ |
| if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) |
| ret = -EPERM; |
| else { |
| if (val < 0) |
| ret = -EINVAL; |
| else |
| sk->sk_ll_usec = val; |
| } |
| break; |
| #endif |
| |
| case SO_MAX_PACING_RATE: |
| sk->sk_max_pacing_rate = val; |
| sk->sk_pacing_rate = min(sk->sk_pacing_rate, |
| sk->sk_max_pacing_rate); |
| break; |
| |
| case SO_INCOMING_CPU: |
| sk->sk_incoming_cpu = val; |
| break; |
| |
| default: |
| ret = -ENOPROTOOPT; |
| break; |
| } |
| release_sock(sk); |
| return ret; |
| } |
| EXPORT_SYMBOL(sock_setsockopt); |
| |
| |
| static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
| struct ucred *ucred) |
| { |
| ucred->pid = pid_vnr(pid); |
| ucred->uid = ucred->gid = -1; |
| if (cred) { |
| struct user_namespace *current_ns = current_user_ns(); |
| |
| ucred->uid = from_kuid_munged(current_ns, cred->euid); |
| ucred->gid = from_kgid_munged(current_ns, cred->egid); |
| } |
| } |
| |
| int sock_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct sock *sk = sock->sk; |
| |
| union { |
| int val; |
| struct linger ling; |
| struct timeval tm; |
| } v; |
| |
| int lv = sizeof(int); |
| int len; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| if (len < 0) |
| return -EINVAL; |
| |
| memset(&v, 0, sizeof(v)); |
| |
| switch (optname) { |
| case SO_DEBUG: |
| v.val = sock_flag(sk, SOCK_DBG); |
| break; |
| |
| case SO_DONTROUTE: |
| v.val = sock_flag(sk, SOCK_LOCALROUTE); |
| break; |
| |
| case SO_BROADCAST: |
| v.val = sock_flag(sk, SOCK_BROADCAST); |
| break; |
| |
| case SO_SNDBUF: |
| v.val = sk->sk_sndbuf; |
| break; |
| |
| case SO_RCVBUF: |
| v.val = sk->sk_rcvbuf; |
| break; |
| |
| case SO_REUSEADDR: |
| v.val = sk->sk_reuse; |
| break; |
| |
| case SO_REUSEPORT: |
| v.val = sk->sk_reuseport; |
| break; |
| |
| case SO_KEEPALIVE: |
| v.val = sock_flag(sk, SOCK_KEEPOPEN); |
| break; |
| |
| case SO_TYPE: |
| v.val = sk->sk_type; |
| break; |
| |
| case SO_PROTOCOL: |
| v.val = sk->sk_protocol; |
| break; |
| |
| case SO_DOMAIN: |
| v.val = sk->sk_family; |
| break; |
| |
| case SO_ERROR: |
| v.val = -sock_error(sk); |
| if (v.val == 0) |
| v.val = xchg(&sk->sk_err_soft, 0); |
| break; |
| |
| case SO_OOBINLINE: |
| v.val = sock_flag(sk, SOCK_URGINLINE); |
| break; |
| |
| case SO_NO_CHECK: |
| v.val = sk->sk_no_check_tx; |
| break; |
| |
| case SO_PRIORITY: |
| v.val = sk->sk_priority; |
| break; |
| |
| case SO_LINGER: |
| lv = sizeof(v.ling); |
| v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
| v.ling.l_linger = sk->sk_lingertime / HZ; |
| break; |
| |
| case SO_BSDCOMPAT: |
| sock_warn_obsolete_bsdism("getsockopt"); |
| break; |
| |
| case SO_TIMESTAMP: |
| v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
| !sock_flag(sk, SOCK_RCVTSTAMPNS); |
| break; |
| |
| case SO_TIMESTAMPNS: |
| v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); |
| break; |
| |
| case SO_TIMESTAMPING: |
| v.val = sk->sk_tsflags; |
| break; |
| |
| case SO_RCVTIMEO: |
| lv = sizeof(struct timeval); |
| if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
| v.tm.tv_sec = 0; |
| v.tm.tv_usec = 0; |
| } else { |
| v.tm.tv_sec = sk->sk_rcvtimeo / HZ; |
| v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; |
| } |
| break; |
| |
| case SO_SNDTIMEO: |
| lv = sizeof(struct timeval); |
| if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
| v.tm.tv_sec = 0; |
| v.tm.tv_usec = 0; |
| } else { |
| v.tm.tv_sec = sk->sk_sndtimeo / HZ; |
| v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; |
| } |
| break; |
| |
| case SO_RCVLOWAT: |
| v.val = sk->sk_rcvlowat; |
| break; |
| |
| case SO_SNDLOWAT: |
| v.val = 1; |
| break; |
| |
| case SO_PASSCRED: |
| v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
| break; |
| |
| case SO_PEERCRED: |
| { |
| struct ucred peercred; |
| if (len > sizeof(peercred)) |
| len = sizeof(peercred); |
| cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); |
| if (copy_to_user(optval, &peercred, len)) |
| return -EFAULT; |
| goto lenout; |
| } |
| |
| case SO_PEERNAME: |
| { |
| char address[128]; |
| |
| if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) |
| return -ENOTCONN; |
| if (lv < len) |
| return -EINVAL; |
| if (copy_to_user(optval, address, len)) |
| return -EFAULT; |
| goto lenout; |
| } |
| |
| /* Dubious BSD thing... Probably nobody even uses it, but |
| * the UNIX standard wants it for whatever reason... -DaveM |
| */ |
| case SO_ACCEPTCONN: |
| v.val = sk->sk_state == TCP_LISTEN; |
| break; |
| |
| case SO_PASSSEC: |
| v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
| break; |
| |
| case SO_PEERSEC: |
| return security_socket_getpeersec_stream(sock, optval, optlen, len); |
| |
| case SO_MARK: |
| v.val = sk->sk_mark; |
| break; |
| |
| case SO_RXQ_OVFL: |
| v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
| break; |
| |
| case SO_WIFI_STATUS: |
| v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
| break; |
| |
| case SO_PEEK_OFF: |
| if (!sock->ops->set_peek_off) |
| return -EOPNOTSUPP; |
| |
| v.val = sk->sk_peek_off; |
| break; |
| case SO_NOFCS: |
| v.val = sock_flag(sk, SOCK_NOFCS); |
| break; |
| |
| case SO_BINDTODEVICE: |
| return sock_getbindtodevice(sk, optval, optlen, len); |
| |
| case SO_GET_FILTER: |
| len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); |
| if (len < 0) |
| return len; |
| |
| goto lenout; |
| |
| case SO_LOCK_FILTER: |
| v.val = sock_flag(sk, SOCK_FILTER_LOCKED); |
| break; |
| |
| case SO_BPF_EXTENSIONS: |
| v.val = bpf_tell_extensions(); |
| break; |
| |
| case SO_SELECT_ERR_QUEUE: |
| v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); |
| break; |
| |
| #ifdef CONFIG_NET_RX_BUSY_POLL |
| case SO_BUSY_POLL: |
| v.val = sk->sk_ll_usec; |
| break; |
| #endif |
| |
| case SO_MAX_PACING_RATE: |
| v.val = sk->sk_max_pacing_rate; |
| break; |
| |
| case SO_INCOMING_CPU: |
| v.val = sk->sk_incoming_cpu; |
| break; |
| |
| default: |
| /* We implement the SO_SNDLOWAT etc to not be settable |
| * (1003.1g 7). |
| */ |
| return -ENOPROTOOPT; |
| } |
| |
| if (len > lv) |
| len = lv; |
| if (copy_to_user(optval, &v, len)) |
| return -EFAULT; |
| lenout: |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /* |
| * Initialize an sk_lock. |
| * |
| * (We also register the sk_lock with the lock validator.) |
| */ |
| static inline void sock_lock_init(struct sock *sk) |
| { |
| sock_lock_init_class_and_name(sk, |
| af_family_slock_key_strings[sk->sk_family], |
| af_family_slock_keys + sk->sk_family, |
| af_family_key_strings[sk->sk_family], |
| af_family_keys + sk->sk_family); |
| } |
| |
| /* |
| * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, |
| * even temporarly, because of RCU lookups. sk_node should also be left as is. |
| * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
| */ |
| static void sock_copy(struct sock *nsk, const struct sock *osk) |
| { |
| #ifdef CONFIG_SECURITY_NETWORK |
| void *sptr = nsk->sk_security; |
| #endif |
| memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
| |
| memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, |
| osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); |
| |
| #ifdef CONFIG_SECURITY_NETWORK |
| nsk->sk_security = sptr; |
| security_sk_clone(osk, nsk); |
| #endif |
| } |
| |
| void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) |
| { |
| unsigned long nulls1, nulls2; |
| |
| nulls1 = offsetof(struct sock, __sk_common.skc_node.next); |
| nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); |
| if (nulls1 > nulls2) |
| swap(nulls1, nulls2); |
| |
| if (nulls1 != 0) |
| memset((char *)sk, 0, nulls1); |
| memset((char *)sk + nulls1 + sizeof(void *), 0, |
| nulls2 - nulls1 - sizeof(void *)); |
| memset((char *)sk + nulls2 + sizeof(void *), 0, |
| size - nulls2 - sizeof(void *)); |
| } |
| EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); |
| |
| static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
| int family) |
| { |
| struct sock *sk; |
| struct kmem_cache *slab; |
| |
| slab = prot->slab; |
| if (slab != NULL) { |
| sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); |
| if (!sk) |
| return sk; |
| if (priority & __GFP_ZERO) { |
| if (prot->clear_sk) |
| prot->clear_sk(sk, prot->obj_size); |
| else |
| sk_prot_clear_nulls(sk, prot->obj_size); |
| } |
| } else |
| sk = kmalloc(prot->obj_size, priority); |
| |
| if (sk != NULL) { |
| kmemcheck_annotate_bitfield(sk, flags); |
| |
| if (security_sk_alloc(sk, family, priority)) |
| goto out_free; |
| |
| if (!try_module_get(prot->owner)) |
| goto out_free_sec; |
| sk_tx_queue_clear(sk); |
| } |
| |
| return sk; |
| |
| out_free_sec: |
| security_sk_free(sk); |
| out_free: |
| if (slab != NULL) |
| kmem_cache_free(slab, sk); |
| else |
| kfree(sk); |
| return NULL; |
| } |
| |
| static void sk_prot_free(struct proto *prot, struct sock *sk) |
| { |
| struct kmem_cache *slab; |
| struct module *owner; |
| |
| owner = prot->owner; |
| slab = prot->slab; |
| |
| security_sk_free(sk); |
| if (slab != NULL) |
| kmem_cache_free(slab, sk); |
| else |
| kfree(sk); |
| module_put(owner); |
| } |
| |
| #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
| void sock_update_netprioidx(struct sock *sk) |
| { |
| if (in_interrupt()) |
| return; |
| |
| sk->sk_cgrp_prioidx = task_netprioidx(current); |
| } |
| EXPORT_SYMBOL_GPL(sock_update_netprioidx); |
| #endif |
| |
| /** |
| * sk_alloc - All socket objects are allocated here |
| * @net: the applicable net namespace |
| * @family: protocol family |
| * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| * @prot: struct proto associated with this new sock instance |
| * @kern: is this to be a kernel socket? |
| */ |
| struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
| struct proto *prot, int kern) |
| { |
| struct sock *sk; |
| |
| sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
| if (sk) { |
| sk->sk_family = family; |
| /* |
| * See comment in struct sock definition to understand |
| * why we need sk_prot_creator -acme |
| */ |
| sk->sk_prot = sk->sk_prot_creator = prot; |
| sock_lock_init(sk); |
| sk->sk_net_refcnt = kern ? 0 : 1; |
| if (likely(sk->sk_net_refcnt)) |
| get_net(net); |
| sock_net_set(sk, net); |
| atomic_set(&sk->sk_wmem_alloc, 1); |
| |
| sock_update_classid(sk); |
| sock_update_netprioidx(sk); |
| } |
| |
| return sk; |
| } |
| EXPORT_SYMBOL(sk_alloc); |
| |
| void sk_destruct(struct sock *sk) |
| { |
| struct sk_filter *filter; |
| |
| if (sk->sk_destruct) |
| sk->sk_destruct(sk); |
| |
| filter = rcu_dereference_check(sk->sk_filter, |
| atomic_read(&sk->sk_wmem_alloc) == 0); |
| if (filter) { |
| sk_filter_uncharge(sk, filter); |
| RCU_INIT_POINTER(sk->sk_filter, NULL); |
| } |
| |
| sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
| |
| if (atomic_read(&sk->sk_omem_alloc)) |
| pr_debug("%s: optmem leakage (%d bytes) detected\n", |
| __func__, atomic_read(&sk->sk_omem_alloc)); |
| |
| if (sk->sk_frag.page) { |
| put_page(sk->sk_frag.page); |
| sk->sk_frag.page = NULL; |
| } |
| |
| if (sk->sk_peer_cred) |
| put_cred(sk->sk_peer_cred); |
| put_pid(sk->sk_peer_pid); |
| if (likely(sk->sk_net_refcnt)) |
| put_net(sock_net(sk)); |
| sk_prot_free(sk->sk_prot_creator, sk); |
| } |
| |
| static void __sk_free(struct sock *sk) |
| { |
| if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk))) |
| sock_diag_broadcast_destroy(sk); |
| else |
| sk_destruct(sk); |
| } |
| |
| void sk_free(struct sock *sk) |
| { |
| /* |
| * We subtract one from sk_wmem_alloc and can know if |
| * some packets are still in some tx queue. |
| * If not null, sock_wfree() will call __sk_free(sk) later |
| */ |
| if (atomic_dec_and_test(&sk->sk_wmem_alloc)) |
| __sk_free(sk); |
| } |
| EXPORT_SYMBOL(sk_free); |
| |
| static void sk_update_clone(const struct sock *sk, struct sock *newsk) |
| { |
| if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
| sock_update_memcg(newsk); |
| } |
| |
| /** |
| * sk_clone_lock - clone a socket, and lock its clone |
| * @sk: the socket to clone |
| * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| * |
| * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) |
| */ |
| struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) |
| { |
| struct sock *newsk; |
| bool is_charged = true; |
| |
| newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
| if (newsk != NULL) { |
| struct sk_filter *filter; |
| |
| sock_copy(newsk, sk); |
| |
| newsk->sk_prot_creator = sk->sk_prot; |
| |
| /* SANITY */ |
| if (likely(newsk->sk_net_refcnt)) |
| get_net(sock_net(newsk)); |
| sk_node_init(&newsk->sk_node); |
| sock_lock_init(newsk); |
| bh_lock_sock(newsk); |
| newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
| newsk->sk_backlog.len = 0; |
| |
| atomic_set(&newsk->sk_rmem_alloc, 0); |
| /* |
| * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) |
| */ |
| atomic_set(&newsk->sk_wmem_alloc, 1); |
| atomic_set(&newsk->sk_omem_alloc, 0); |
| skb_queue_head_init(&newsk->sk_receive_queue); |
| skb_queue_head_init(&newsk->sk_write_queue); |
| |
| rwlock_init(&newsk->sk_callback_lock); |
| lockdep_set_class_and_name(&newsk->sk_callback_lock, |
| af_callback_keys + newsk->sk_family, |
| af_family_clock_key_strings[newsk->sk_family]); |
| |
| newsk->sk_dst_cache = NULL; |
| newsk->sk_wmem_queued = 0; |
| newsk->sk_forward_alloc = 0; |
| newsk->sk_send_head = NULL; |
| newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
| |
| sock_reset_flag(newsk, SOCK_DONE); |
| skb_queue_head_init(&newsk->sk_error_queue); |
| |
| filter = rcu_dereference_protected(newsk->sk_filter, 1); |
| if (filter != NULL) |
| /* though it's an empty new sock, the charging may fail |
| * if sysctl_optmem_max was changed between creation of |
| * original socket and cloning |
| */ |
| is_charged = sk_filter_charge(newsk, filter); |
| |
| if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { |
| /* We need to make sure that we don't uncharge the new |
| * socket if we couldn't charge it in the first place |
| * as otherwise we uncharge the parent's filter. |
| */ |
| if (!is_charged) |
| RCU_INIT_POINTER(newsk->sk_filter, NULL); |
| /* It is still raw copy of parent, so invalidate |
| * destructor and make plain sk_free() */ |
| newsk->sk_destruct = NULL; |
| bh_unlock_sock(newsk); |
| sk_free(newsk); |
| newsk = NULL; |
| goto out; |
| } |
| |
| newsk->sk_err = 0; |
| newsk->sk_err_soft = 0; |
| newsk->sk_priority = 0; |
| newsk->sk_incoming_cpu = raw_smp_processor_id(); |
| atomic64_set(&newsk->sk_cookie, 0); |
| /* |
| * Before updating sk_refcnt, we must commit prior changes to memory |
| * (Documentation/RCU/rculist_nulls.txt for details) |
| */ |
| smp_wmb(); |
| atomic_set(&newsk->sk_refcnt, 2); |
| |
| /* |
| * Increment the counter in the same struct proto as the master |
| * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that |
| * is the same as sk->sk_prot->socks, as this field was copied |
| * with memcpy). |
| * |
| * This _changes_ the previous behaviour, where |
| * tcp_create_openreq_child always was incrementing the |
| * equivalent to tcp_prot->socks (inet_sock_nr), so this have |
| * to be taken into account in all callers. -acme |
| */ |
| sk_refcnt_debug_inc(newsk); |
| sk_set_socket(newsk, NULL); |
| newsk->sk_wq = NULL; |
| |
| sk_update_clone(sk, newsk); |
| |
| if (newsk->sk_prot->sockets_allocated) |
| sk_sockets_allocated_inc(newsk); |
| |
| if (sock_needs_netstamp(sk) && |
| newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
| net_enable_timestamp(); |
| } |
| out: |
| return newsk; |
| } |
| EXPORT_SYMBOL_GPL(sk_clone_lock); |
| |
| void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
| { |
| u32 max_segs = 1; |
| |
| sk_dst_set(sk, dst); |
| sk->sk_route_caps = dst->dev->features; |
| if (sk->sk_route_caps & NETIF_F_GSO) |
| sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
| sk->sk_route_caps &= ~sk->sk_route_nocaps; |
| if (sk_can_gso(sk)) { |
| if (dst->header_len) { |
| sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
| } else { |
| sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
| sk->sk_gso_max_size = dst->dev->gso_max_size; |
| max_segs = max_t(u32, dst->dev->gso_max_segs, 1); |
| } |
| } |
| sk->sk_gso_max_segs = max_segs; |
| } |
| EXPORT_SYMBOL_GPL(sk_setup_caps); |
| |
| /* |
| * Simple resource managers for sockets. |
| */ |
| |
| |
| /* |
| * Write buffer destructor automatically called from kfree_skb. |
| */ |
| void sock_wfree(struct sk_buff *skb) |
| { |
| struct sock *sk = skb->sk; |
| unsigned int len = skb->truesize; |
| |
| if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
| /* |
| * Keep a reference on sk_wmem_alloc, this will be released |
| * after sk_write_space() call |
| */ |
| atomic_sub(len - 1, &sk->sk_wmem_alloc); |
| sk->sk_write_space(sk); |
| len = 1; |
| } |
| /* |
| * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
| * could not do because of in-flight packets |
| */ |
| if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
| __sk_free(sk); |
| } |
| EXPORT_SYMBOL(sock_wfree); |
| |
| void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
| { |
| skb_orphan(skb); |
| skb->sk = sk; |
| #ifdef CONFIG_INET |
| if (unlikely(!sk_fullsock(sk))) { |
| skb->destructor = sock_edemux; |
| sock_hold(sk); |
| return; |
| } |
| #endif |
| skb->destructor = sock_wfree; |
| skb_set_hash_from_sk(skb, sk); |
| /* |
| * We used to take a refcount on sk, but following operation |
| * is enough to guarantee sk_free() wont free this sock until |
| * all in-flight packets are completed |
| */ |
| atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
| } |
| EXPORT_SYMBOL(skb_set_owner_w); |
| |
| void skb_orphan_partial(struct sk_buff *skb) |
| { |
| if (skb->destructor == sock_wfree |
| #ifdef CONFIG_INET |
| || skb->destructor == tcp_wfree |
| #endif |
| ) { |
| struct sock *sk = skb->sk; |
| |
| if (atomic_inc_not_zero(&sk->sk_refcnt)) { |
| atomic_sub(skb->truesize, &sk->sk_wmem_alloc); |
| skb->destructor = sock_efree; |
| } |
| } else { |
| skb_orphan(skb); |
| } |
| } |
| EXPORT_SYMBOL(skb_orphan_partial); |
| |
| /* |
| * Read buffer destructor automatically called from kfree_skb. |
| */ |
| void sock_rfree(struct sk_buff *skb) |
| { |
| struct sock *sk = skb->sk; |
| unsigned int len = skb->truesize; |
| |
| atomic_sub(len, &sk->sk_rmem_alloc); |
| sk_mem_uncharge(sk, len); |
| } |
| EXPORT_SYMBOL(sock_rfree); |
| |
| /* |
| * Buffer destructor for skbs that are not used directly in read or write |
| * path, e.g. for error handler skbs. Automatically called from kfree_skb. |
| */ |
| void sock_efree(struct sk_buff *skb) |
| { |
| sock_put(skb->sk); |
| } |
| EXPORT_SYMBOL(sock_efree); |
| |
| kuid_t sock_i_uid(struct sock *sk) |
| { |
| kuid_t uid; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
| read_unlock_bh(&sk->sk_callback_lock); |
| return uid; |
| } |
| EXPORT_SYMBOL(sock_i_uid); |
| |
| unsigned long sock_i_ino(struct sock *sk) |
| { |
| unsigned long ino; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
| read_unlock_bh(&sk->sk_callback_lock); |
| return ino; |
| } |
| EXPORT_SYMBOL(sock_i_ino); |
| |
| /* |
| * Allocate a skb from the socket's send buffer. |
| */ |
| struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
| gfp_t priority) |
| { |
| if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
| struct sk_buff *skb = alloc_skb(size, priority); |
| if (skb) { |
| skb_set_owner_w(skb, sk); |
| return skb; |
| } |
| } |
| return NULL; |
| } |
| EXPORT_SYMBOL(sock_wmalloc); |
| |
| /* |
| * Allocate a memory block from the socket's option memory buffer. |
| */ |
| void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
| { |
| if ((unsigned int)size <= sysctl_optmem_max && |
| atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
| void *mem; |
| /* First do the add, to avoid the race if kmalloc |
| * might sleep. |
| */ |
| atomic_add(size, &sk->sk_omem_alloc); |
| mem = kmalloc(size, priority); |
| if (mem) |
| return mem; |
| atomic_sub(size, &sk->sk_omem_alloc); |
| } |
| return NULL; |
| } |
| EXPORT_SYMBOL(sock_kmalloc); |
| |
| /* Free an option memory block. Note, we actually want the inline |
| * here as this allows gcc to detect the nullify and fold away the |
| * condition entirely. |
| */ |
| static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
| const bool nullify) |
| { |
| if (WARN_ON_ONCE(!mem)) |
| return; |
| if (nullify) |
| kzfree(mem); |
| else |
| kfree(mem); |
| atomic_sub(size, &sk->sk_omem_alloc); |
| } |
| |
| void sock_kfree_s(struct sock *sk, void *mem, int size) |
| { |
| __sock_kfree_s(sk, mem, size, false); |
| } |
| EXPORT_SYMBOL(sock_kfree_s); |
| |
| void sock_kzfree_s(struct sock *sk, void *mem, int size) |
| { |
| __sock_kfree_s(sk, mem, size, true); |
| } |
| EXPORT_SYMBOL(sock_kzfree_s); |
| |
| /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
| I think, these locks should be removed for datagram sockets. |
| */ |
| static long sock_wait_for_wmem(struct sock *sk, long timeo) |
| { |
| DEFINE_WAIT(wait); |
| |
| sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
| for (;;) { |
| if (!timeo) |
| break; |
| if (signal_pending(current)) |
| break; |
| set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
| break; |
| if (sk->sk_shutdown & SEND_SHUTDOWN) |
| break; |
| if (sk->sk_err) |
| break; |
| timeo = schedule_timeout(timeo); |
| } |
| finish_wait(sk_sleep(sk), &wait); |
| return timeo; |
| } |
| |
| |
| /* |
| * Generic send/receive buffer handlers |
| */ |
| |
| struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
| unsigned long data_len, int noblock, |
| int *errcode, int max_page_order) |
| { |
| struct sk_buff *skb; |
| long timeo; |
| int err; |
| |
| timeo = sock_sndtimeo(sk, noblock); |
| for (;;) { |
| err = sock_error(sk); |
| if (err != 0) |
| goto failure; |
| |
| err = -EPIPE; |
| if (sk->sk_shutdown & SEND_SHUTDOWN) |
| goto failure; |
| |
| if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
| break; |
| |
| sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
| set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| err = -EAGAIN; |
| if (!timeo) |
| goto failure; |
| if (signal_pending(current)) |
| goto interrupted; |
| timeo = sock_wait_for_wmem(sk, timeo); |
| } |
| skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
| errcode, sk->sk_allocation); |
| if (skb) |
| skb_set_owner_w(skb, sk); |
| return skb; |
| |
| interrupted: |
| err = sock_intr_errno(timeo); |
| failure: |
| *errcode = err; |
| return NULL; |
| } |
| EXPORT_SYMBOL(sock_alloc_send_pskb); |
| |
| struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
| int noblock, int *errcode) |
| { |
| return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
| } |
| EXPORT_SYMBOL(sock_alloc_send_skb); |
| |
| int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
| struct sockcm_cookie *sockc) |
| { |
| struct cmsghdr *cmsg; |
| |
| for_each_cmsghdr(cmsg, msg) { |
| if (!CMSG_OK(msg, cmsg)) |
| return -EINVAL; |
| if (cmsg->cmsg_level != SOL_SOCKET) |
| continue; |
| switch (cmsg->cmsg_type) { |
| case SO_MARK: |
| if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
| return -EPERM; |
| if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) |
| return -EINVAL; |
| sockc->mark = *(u32 *)CMSG_DATA(cmsg); |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(sock_cmsg_send); |
| |
| /* On 32bit arches, an skb frag is limited to 2^15 */ |
| #define SKB_FRAG_PAGE_ORDER get_order(32768) |
| |
| /** |
| * skb_page_frag_refill - check that a page_frag contains enough room |
| * @sz: minimum size of the fragment we want to get |
| * @pfrag: pointer to page_frag |
| * @gfp: priority for memory allocation |
| * |
| * Note: While this allocator tries to use high order pages, there is |
| * no guarantee that allocations succeed. Therefore, @sz MUST be |
| * less or equal than PAGE_SIZE. |
| */ |
| bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
| { |
| if (pfrag->page) { |
| if (atomic_read(&pfrag->page->_count) == 1) { |
| pfrag->offset = 0; |
| return true; |
| } |
| if (pfrag->offset + sz <= pfrag->size) |
| return true; |
| put_page(pfrag->page); |
| } |
| |
| pfrag->offset = 0; |
| if (SKB_FRAG_PAGE_ORDER) { |
| /* Avoid direct reclaim but allow kswapd to wake */ |
| pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | |
| __GFP_COMP | __GFP_NOWARN | |
| __GFP_NORETRY, |
| SKB_FRAG_PAGE_ORDER); |
| if (likely(pfrag->page)) { |
| pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
| return true; |
| } |
| } |
| pfrag->page = alloc_page(gfp); |
| if (likely(pfrag->page)) { |
| pfrag->size = PAGE_SIZE; |
| return true; |
| } |
| return false; |
| } |
| EXPORT_SYMBOL(skb_page_frag_refill); |
| |
| bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) |
| { |
| if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) |
| return true; |
| |
| sk_enter_memory_pressure(sk); |
| sk_stream_moderate_sndbuf(sk); |
| return false; |
| } |
| EXPORT_SYMBOL(sk_page_frag_refill); |
| |
| static void __lock_sock(struct sock *sk) |
| __releases(&sk->sk_lock.slock) |
| __acquires(&sk->sk_lock.slock) |
| { |
| DEFINE_WAIT(wait); |
| |
| for (;;) { |
| prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
| TASK_UNINTERRUPTIBLE); |
| spin_unlock_bh(&sk->sk_lock.slock); |
| schedule(); |
| spin_lock_bh(&sk->sk_lock.slock); |
| if (!sock_owned_by_user(sk)) |
| break; |
| } |
| finish_wait(&sk->sk_lock.wq, &wait); |
| } |
| |
| static void __release_sock(struct sock *sk) |
| __releases(&sk->sk_lock.slock) |
| __acquires(&sk->sk_lock.slock) |
| { |
| struct sk_buff *skb = sk->sk_backlog.head; |
| |
| do { |
| sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
| bh_unlock_sock(sk); |
| |
| do { |
| struct sk_buff *next = skb->next; |
| |
| prefetch(next); |
| WARN_ON_ONCE(skb_dst_is_noref(skb)); |
| skb->next = NULL; |
| sk_backlog_rcv(sk, skb); |
| |
| /* |
| * We are in process context here with softirqs |
| * disabled, use cond_resched_softirq() to preempt. |
| * This is safe to do because we've taken the backlog |
| * queue private: |
| */ |
| cond_resched_softirq(); |
| |
| skb = next; |
| } while (skb != NULL); |
| |
| bh_lock_sock(sk); |
| } while ((skb = sk->sk_backlog.head) != NULL); |
| |
| /* |
| * Doing the zeroing here guarantee we can not loop forever |
| * while a wild producer attempts to flood us. |
| */ |
| sk->sk_backlog.len = 0; |
| } |
| |
| /** |
| * sk_wait_data - wait for data to arrive at sk_receive_queue |
| * @sk: sock to wait on |
| * @timeo: for how long |
| * @skb: last skb seen on sk_receive_queue |
| * |
| * Now socket state including sk->sk_err is changed only under lock, |
| * hence we may omit checks after joining wait queue. |
| * We check receive queue before schedule() only as optimization; |
| * it is very likely that release_sock() added new data. |
| */ |
| int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) |
| { |
| int rc; |
| DEFINE_WAIT(wait); |
| |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
| rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb); |
| sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
| finish_wait(sk_sleep(sk), &wait); |
| return rc; |
| } |
| EXPORT_SYMBOL(sk_wait_data); |
| |
| /** |
| * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated |
| * @sk: socket |
| * @size: memory size to allocate |
| * @kind: allocation type |
| * |
| * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means |
| * rmem allocation. This function assumes that protocols which have |
| * memory_pressure use sk_wmem_queued as write buffer accounting. |
| */ |
| int __sk_mem_schedule(struct sock *sk, int size, int kind) |
| { |
| struct proto *prot = sk->sk_prot; |
| int amt = sk_mem_pages(size); |
| long allocated; |
| int parent_status = UNDER_LIMIT; |
| |
| sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; |
| |
| allocated = sk_memory_allocated_add(sk, amt, &parent_status); |
| |
| /* Under limit. */ |
| if (parent_status == UNDER_LIMIT && |
| allocated <= sk_prot_mem_limits(sk, 0)) { |
| sk_leave_memory_pressure(sk); |
| return 1; |
| } |
| |
| /* Under pressure. (we or our parents) */ |
| if ((parent_status > SOFT_LIMIT) || |
| allocated > sk_prot_mem_limits(sk, 1)) |
| sk_enter_memory_pressure(sk); |
| |
| /* Over hard limit (we or our parents) */ |
| if ((parent_status == OVER_LIMIT) || |
| (allocated > sk_prot_mem_limits(sk, 2))) |
| goto suppress_allocation; |
| |
| /* guarantee minimum buffer size under pressure */ |
| if (kind == SK_MEM_RECV) { |
| if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) |
| return 1; |
| |
| } else { /* SK_MEM_SEND */ |
| if (sk->sk_type == SOCK_STREAM) { |
| if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) |
| return 1; |
| } else if (atomic_read(&sk->sk_wmem_alloc) < |
| prot->sysctl_wmem[0]) |
| return 1; |
| } |
| |
| if (sk_has_memory_pressure(sk)) { |
| int alloc; |
| |
| if (!sk_under_memory_pressure(sk)) |
| return 1; |
| alloc = sk_sockets_allocated_read_positive(sk); |
| if (sk_prot_mem_limits(sk, 2) > alloc * |
| sk_mem_pages(sk->sk_wmem_queued + |
| atomic_read(&sk->sk_rmem_alloc) + |
| sk->sk_forward_alloc)) |
| return 1; |
| } |
| |
| suppress_allocation: |
| |
| if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { |
| sk_stream_moderate_sndbuf(sk); |
| |
| /* Fail only if socket is _under_ its sndbuf. |
| * In this case we cannot block, so that we have to fail. |
| */ |
| if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) |
| return 1; |
| } |
| |
| trace_sock_exceed_buf_limit(sk, prot, allocated); |
| |
| /* Alas. Undo changes. */ |
| sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; |
| |
| sk_memory_allocated_sub(sk, amt); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(__sk_mem_schedule); |
| |
| /** |
| * __sk_mem_reclaim - reclaim memory_allocated |
| * @sk: socket |
| * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) |
| */ |
| void __sk_mem_reclaim(struct sock *sk, int amount) |
| { |
| amount >>= SK_MEM_QUANTUM_SHIFT; |
| sk_memory_allocated_sub(sk, amount); |
| sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; |
| |
| if (sk_under_memory_pressure(sk) && |
| (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) |
| sk_leave_memory_pressure(sk); |
| } |
| EXPORT_SYMBOL(__sk_mem_reclaim); |
| |
| |
| /* |
| * Set of default routines for initialising struct proto_ops when |
| * the protocol does not support a particular function. In certain |
| * cases where it makes no sense for a protocol to have a "do nothing" |
| * function, some default processing is provided. |
| */ |
| |
| int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_bind); |
| |
| int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
| int len, int flags) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_connect); |
| |
| int sock_no_socketpair(struct socket *sock1, struct socket *sock2) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_socketpair); |
| |
| int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_accept); |
| |
| int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
| int *len, int peer) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_getname); |
| |
| unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
| { |
| return 0; |
| } |
| EXPORT_SYMBOL(sock_no_poll); |
| |
| int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_ioctl); |
| |
| int sock_no_listen(struct socket *sock, int backlog) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_listen); |
| |
| int sock_no_shutdown(struct socket *sock, int how) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_shutdown); |
| |
| int sock_no_setsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_setsockopt); |
| |
| int sock_no_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_getsockopt); |
| |
| int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_sendmsg); |
| |
| int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
| int flags) |
| { |
| return -EOPNOTSUPP; |
| } |
| EXPORT_SYMBOL(sock_no_recvmsg); |
| |
| int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
| { |
| /* Mirror missing mmap method error code */ |
| return -ENODEV; |
| } |
| EXPORT_SYMBOL(sock_no_mmap); |
| |
| ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) |
| { |
| ssize_t res; |
| struct msghdr msg = {.msg_flags = flags}; |
| struct kvec iov; |
| char *kaddr = kmap(page); |
| iov.iov_base = kaddr + offset; |
| iov.iov_len = size; |
| res = kernel_sendmsg(sock, &msg, &iov, 1, size); |
| kunmap(page); |
| return res; |
| } |
| EXPORT_SYMBOL(sock_no_sendpage); |
| |
| /* |
| * Default Socket Callbacks |
| */ |
| |
| static void sock_def_wakeup(struct sock *sk) |
| { |
| struct socket_wq *wq; |
| |
| rcu_read_lock(); |
| wq = rcu_dereference(sk->sk_wq); |
| if (wq_has_sleeper(wq)) |
| wake_up_interruptible_all(&wq->wait); |
| rcu_read_unlock(); |
| } |
| |
| static void sock_def_error_report(struct sock *sk) |
| { |
| struct socket_wq *wq; |
| |
| rcu_read_lock(); |
| wq = rcu_dereference(sk->sk_wq); |
| if (wq_has_sleeper(wq)) |
| wake_up_interruptible_poll(&wq->wait, POLLERR); |
| sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
| rcu_read_unlock(); |
| } |
| |
| static void sock_def_readable(struct sock *sk) |
| { |
| struct socket_wq *wq; |
| |
| rcu_read_lock(); |
| wq = rcu_dereference(sk->sk_wq); |
| if (wq_has_sleeper(wq)) |
| wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
| POLLRDNORM | POLLRDBAND); |
| sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
| rcu_read_unlock(); |
| } |
| |
| static void sock_def_write_space(struct sock *sk) |
| { |
| struct socket_wq *wq; |
| |
| rcu_read_lock(); |
| |
| /* Do not wake up a writer until he can make "significant" |
| * progress. --DaveM |
| */ |
| if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
| wq = rcu_dereference(sk->sk_wq); |
| if (wq_has_sleeper(wq)) |
| wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
| POLLWRNORM | POLLWRBAND); |
| |
| /* Should agree with poll, otherwise some programs break */ |
| if (sock_writeable(sk)) |
| sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
| } |
| |
| rcu_read_unlock(); |
| } |
| |
| static void sock_def_destruct(struct sock *sk) |
| { |
| } |
| |
| void sk_send_sigurg(struct sock *sk) |
| { |
| if (sk->sk_socket && sk->sk_socket->file) |
| if (send_sigurg(&sk->sk_socket->file->f_owner)) |
| sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
| } |
| EXPORT_SYMBOL(sk_send_sigurg); |
| |
| void sk_reset_timer(struct sock *sk, struct timer_list* timer, |
| unsigned long expires) |
| { |
| if (!mod_timer(timer, expires)) |
| sock_hold(sk); |
| } |
| EXPORT_SYMBOL(sk_reset_timer); |
| |
| void sk_stop_timer(struct sock *sk, struct timer_list* timer) |
| { |
| if (del_timer(timer)) |
| __sock_put(sk); |
| } |
| EXPORT_SYMBOL(sk_stop_timer); |
| |
| void sock_init_data(struct socket *sock, struct sock *sk) |
| { |
| skb_queue_head_init(&sk->sk_receive_queue); |
| skb_queue_head_init(&sk->sk_write_queue); |
| skb_queue_head_init(&sk->sk_error_queue); |
| |
| sk->sk_send_head = NULL; |
| |
| init_timer(&sk->sk_timer); |
| |
| sk->sk_allocation = GFP_KERNEL; |
| sk->sk_rcvbuf = sysctl_rmem_default; |
| sk->sk_sndbuf = sysctl_wmem_default; |
| sk->sk_state = TCP_CLOSE; |
| sk_set_socket(sk, sock); |
| |
| sock_set_flag(sk, SOCK_ZAPPED); |
| |
| if (sock) { |
| sk->sk_type = sock->type; |
| sk->sk_wq = sock->wq; |
| sock->sk = sk; |
| sk->sk_uid = SOCK_INODE(sock)->i_uid; |
| } else { |
| sk->sk_wq = NULL; |
| sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); |
| } |
| |
| rwlock_init(&sk->sk_callback_lock); |
| lockdep_set_class_and_name(&sk->sk_callback_lock, |
| af_callback_keys + sk->sk_family, |
| af_family_clock_key_strings[sk->sk_family]); |
| |
| sk->sk_state_change = sock_def_wakeup; |
| sk->sk_data_ready = sock_def_readable; |
| sk->sk_write_space = sock_def_write_space; |
| sk->sk_error_report = sock_def_error_report; |
| sk->sk_destruct = sock_def_destruct; |
| |
| sk->sk_frag.page = NULL; |
| sk->sk_frag.offset = 0; |
| sk->sk_peek_off = -1; |
| |
| sk->sk_peer_pid = NULL; |
| sk->sk_peer_cred = NULL; |
| sk->sk_write_pending = 0; |
| sk->sk_rcvlowat = 1; |
| sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
| |
| sk->sk_stamp = ktime_set(-1L, 0); |
| |
| #ifdef CONFIG_NET_RX_BUSY_POLL |
| sk->sk_napi_id = 0; |
| sk->sk_ll_usec = sysctl_net_busy_read; |
| #endif |
| |
| sk->sk_max_pacing_rate = ~0U; |
| sk->sk_pacing_rate = ~0U; |
| sk->sk_incoming_cpu = -1; |
| /* |
| * Before updating sk_refcnt, we must commit prior changes to memory |
| * (Documentation/RCU/rculist_nulls.txt for details) |
| */ |
| smp_wmb(); |
| atomic_set(&sk->sk_refcnt, 1); |
| atomic_set(&sk->sk_drops, 0); |
| } |
| EXPORT_SYMBOL(sock_init_data); |
| |
| void lock_sock_nested(struct sock *sk, int subclass) |
| { |
| might_sleep(); |
| spin_lock_bh(&sk->sk_lock.slock); |
| if (sk->sk_lock.owned) |
| __lock_sock(sk); |
| sk->sk_lock.owned = 1; |
| spin_unlock(&sk->sk_lock.slock); |
| /* |
| * The sk_lock has mutex_lock() semantics here: |
| */ |
| mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
| local_bh_enable(); |
| } |
| EXPORT_SYMBOL(lock_sock_nested); |
| |
| void release_sock(struct sock *sk) |
| { |
| /* |
| * The sk_lock has mutex_unlock() semantics: |
| */ |
| mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
| |
| spin_lock_bh(&sk->sk_lock.slock); |
| if (sk->sk_backlog.tail) |
| __release_sock(sk); |
| |
| /* Warning : release_cb() might need to release sk ownership, |
| * ie call sock_release_ownership(sk) before us. |
| */ |
| if (sk->sk_prot->release_cb) |
| sk->sk_prot->release_cb(sk); |
| |
| sock_release_ownership(sk); |
| if (waitqueue_active(&sk->sk_lock.wq)) |
| wake_up(&sk->sk_lock.wq); |
| spin_unlock_bh(&sk->sk_lock.slock); |
| } |
| EXPORT_SYMBOL(release_sock); |
| |
| /** |
| * lock_sock_fast - fast version of lock_sock |
| * @sk: socket |
| * |
| * This version should be used for very small section, where process wont block |
| * return false if fast path is taken |
| * sk_lock.slock locked, owned = 0, BH disabled |
| * return true if slow path is taken |
| * sk_lock.slock unlocked, owned = 1, BH enabled |
| */ |
| bool lock_sock_fast(struct sock *sk) |
| { |
| might_sleep(); |
| spin_lock_bh(&sk->sk_lock.slock); |
| |
| if (!sk->sk_lock.owned) |
| /* |
| * Note : We must disable BH |
| */ |
| return false; |
| |
| __lock_sock(sk); |
| sk->sk_lock.owned = 1; |
| spin_unlock(&sk->sk_lock.slock); |
| /* |
| * The sk_lock has mutex_lock() semantics here: |
| */ |
| mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); |
| local_bh_enable(); |
| return true; |
| } |
| EXPORT_SYMBOL(lock_sock_fast); |
| |
| int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
| { |
| struct timeval tv; |
| if (!sock_flag(sk, SOCK_TIMESTAMP)) |
| sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
| tv = ktime_to_timeval(sk->sk_stamp); |
| if (tv.tv_sec == -1) |
| return -ENOENT; |
| if (tv.tv_sec == 0) { |
| sk->sk_stamp = ktime_get_real(); |
| tv = ktime_to_timeval(sk->sk_stamp); |
| } |
| return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; |
| } |
| EXPORT_SYMBOL(sock_get_timestamp); |
| |
| int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
| { |
| struct timespec ts; |
| if (!sock_flag(sk, SOCK_TIMESTAMP)) |
| sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
| ts = ktime_to_timespec(sk->sk_stamp); |
| if (ts.tv_sec == -1) |
| return -ENOENT; |
| if (ts.tv_sec == 0) { |
| sk->sk_stamp = ktime_get_real(); |
| ts = ktime_to_timespec(sk->sk_stamp); |
| } |
| return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; |
| } |
| EXPORT_SYMBOL(sock_get_timestampns); |
| |
| void sock_enable_timestamp(struct sock *sk, int flag) |
| { |
| if (!sock_flag(sk, flag)) { |
| unsigned long previous_flags = sk->sk_flags; |
| |
| sock_set_flag(sk, flag); |
| /* |
| * we just set one of the two flags which require net |
| * time stamping, but time stamping might have been on |
| * already because of the other one |
| */ |
| if (sock_needs_netstamp(sk) && |
| !(previous_flags & SK_FLAGS_TIMESTAMP)) |
| net_enable_timestamp(); |
| } |
| } |
| |
| int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
| int level, int type) |
| { |
| struct sock_exterr_skb *serr; |
| struct sk_buff *skb; |
| int copied, err; |
| |
| err = -EAGAIN; |
| skb = sock_dequeue_err_skb(sk); |
| if (skb == NULL) |
| goto out; |
| |
| copied = skb->len; |
| if (copied > len) { |
| msg->msg_flags |= MSG_TRUNC; |
| copied = len; |
| } |
| err = skb_copy_datagram_msg(skb, 0, msg, copied); |
| if (err) |
| goto out_free_skb; |
| |
| sock_recv_timestamp(msg, sk, skb); |
| |
| serr = SKB_EXT_ERR(skb); |
| put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); |
| |
| msg->msg_flags |= MSG_ERRQUEUE; |
| err = copied; |
| |
| out_free_skb: |
| kfree_skb(skb); |
| out: |
| return err; |
| } |
| EXPORT_SYMBOL(sock_recv_errqueue); |
| |
| /* |
| * Get a socket option on an socket. |
| * |
| * FIX: POSIX 1003.1g is very ambiguous here. It states that |
| * asynchronous errors should be reported by getsockopt. We assume |
| * this means if you specify SO_ERROR (otherwise whats the point of it). |
| */ |
| int sock_common_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct sock *sk = sock->sk; |
| |
| return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| } |
| EXPORT_SYMBOL(sock_common_getsockopt); |
| |
| #ifdef CONFIG_COMPAT |
| int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct sock *sk = sock->sk; |
| |
| if (sk->sk_prot->compat_getsockopt != NULL) |
| return sk->sk_prot->compat_getsockopt(sk, level, optname, |
| optval, optlen); |
| return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| } |
| EXPORT_SYMBOL(compat_sock_common_getsockopt); |
| #endif |
| |
| int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
| int flags) |
| { |
| struct sock *sk = sock->sk; |
| int addr_len = 0; |
| int err; |
| |
| err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
| flags & ~MSG_DONTWAIT, &addr_len); |
| if (err >= 0) |
| msg->msg_namelen = addr_len; |
| return err; |
| } |
| EXPORT_SYMBOL(sock_common_recvmsg); |
| |
| /* |
| * Set socket options on an inet socket. |
| */ |
| int sock_common_setsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| struct sock *sk = sock->sk; |
| |
| return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| } |
| EXPORT_SYMBOL(sock_common_setsockopt); |
| |
| #ifdef CONFIG_COMPAT |
| int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| struct sock *sk = sock->sk; |
| |
| if (sk->sk_prot->compat_setsockopt != NULL) |
| return sk->sk_prot->compat_setsockopt(sk, level, optname, |
| optval, optlen); |
| return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| } |
| EXPORT_SYMBOL(compat_sock_common_setsockopt); |
| #endif |
| |
| void sk_common_release(struct sock *sk) |
| { |
| if (sk->sk_prot->destroy) |
| sk->sk_prot->destroy(sk); |
| |
| /* |
| * Observation: when sock_common_release is called, processes have |
| * no access to socket. But net still has. |
| * Step one, detach it from networking: |
| * |
| * A. Remove from hash tables. |
| */ |
| |
| sk->sk_prot->unhash(sk); |
| |
| /* |
| * In this point socket cannot receive new packets, but it is possible |
| * that some packets are in flight because some CPU runs receiver and |
| * did hash table lookup before we unhashed socket. They will achieve |
| * receive queue and will be purged by socket destructor. |
| * |
| * Also we still have packets pending on receive queue and probably, |
| * our own packets waiting in device queues. sock_destroy will drain |
| * receive queue, but transmitted packets will delay socket destruction |
| * until the last reference will be released. |
| */ |
| |
| sock_orphan(sk); |
| |
| xfrm_sk_free_policy(sk); |
| |
| sk_refcnt_debug_release(sk); |
| |
| sock_put(sk); |
| } |
| EXPORT_SYMBOL(sk_common_release); |
| |
| #ifdef CONFIG_PROC_FS |
| #define PROTO_INUSE_NR 64 /* should be enough for the first time */ |
| struct prot_inuse { |
| int val[PROTO_INUSE_NR]; |
| }; |
| |
| static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); |
| |
| #ifdef CONFIG_NET_NS |
| void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
| { |
| __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
| } |
| EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| |
| int sock_prot_inuse_get(struct net *net, struct proto *prot) |
| { |
| int cpu, idx = prot->inuse_idx; |
| int res = 0; |
| |
| for_each_possible_cpu(cpu) |
| res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; |
| |
| return res >= 0 ? res : 0; |
| } |
| EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
| |
| static int __net_init sock_inuse_init_net(struct net *net) |
| { |
| net->core.inuse = alloc_percpu(struct prot_inuse); |
| return net->core.inuse ? 0 : -ENOMEM; |
| } |
| |
| static void __net_exit sock_inuse_exit_net(struct net *net) |
| { |
| free_percpu(net->core.inuse); |
| } |
| |
| static struct pernet_operations net_inuse_ops = { |
| .init = sock_inuse_init_net, |
| .exit = sock_inuse_exit_net, |
| }; |
| |
| static __init int net_inuse_init(void) |
| { |
| if (register_pernet_subsys(&net_inuse_ops)) |
| panic("Cannot initialize net inuse counters"); |
| |
| return 0; |
| } |
| |
| core_initcall(net_inuse_init); |
| #else |
| static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
| |
| void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
| { |
| __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
| } |
| EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| |
| int sock_prot_inuse_get(struct net *net, struct proto *prot) |
| { |
| int cpu, idx = prot->inuse_idx; |
| int res = 0; |
| |
| for_each_possible_cpu(cpu) |
| res += per_cpu(prot_inuse, cpu).val[idx]; |
| |
| return res >= 0 ? res : 0; |
| } |
| EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
| #endif |
| |
| static void assign_proto_idx(struct proto *prot) |
| { |
| prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); |
| |
| if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { |
| pr_err("PROTO_INUSE_NR exhausted\n"); |
| return; |
| } |
| |
| set_bit(prot->inuse_idx, proto_inuse_idx); |
| } |
| |
| static void release_proto_idx(struct proto *prot) |
| { |
| if (prot->inuse_idx != PROTO_INUSE_NR - 1) |
| clear_bit(prot->inuse_idx, proto_inuse_idx); |
| } |
| #else |
| static inline void assign_proto_idx(struct proto *prot) |
| { |
| } |
| |
| static inline void release_proto_idx(struct proto *prot) |
| { |
| } |
| #endif |
| |
| static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
| { |
| if (!rsk_prot) |
| return; |
| kfree(rsk_prot->slab_name); |
| rsk_prot->slab_name = NULL; |
| kmem_cache_destroy(rsk_prot->slab); |
| rsk_prot->slab = NULL; |
| } |
| |
| static int req_prot_init(const struct proto *prot) |
| { |
| struct request_sock_ops *rsk_prot = prot->rsk_prot; |
| |
| if (!rsk_prot) |
| return 0; |
| |
| rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", |
| prot->name); |
| if (!rsk_prot->slab_name) |
| return -ENOMEM; |
| |
| rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, |
| rsk_prot->obj_size, 0, |
| prot->slab_flags, NULL); |
| |
| if (!rsk_prot->slab) { |
| pr_crit("%s: Can't create request sock SLAB cache!\n", |
| prot->name); |
| return -ENOMEM; |
| } |
| return 0; |
| } |
| |
| int proto_register(struct proto *prot, int alloc_slab) |
| { |
| if (alloc_slab) { |
| prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, |
| SLAB_HWCACHE_ALIGN | prot->slab_flags, |
| NULL); |
| |
| if (prot->slab == NULL) { |
| pr_crit("%s: Can't create sock SLAB cache!\n", |
| prot->name); |
| goto out; |
| } |
| |
| if (req_prot_init(prot)) |
| goto out_free_request_sock_slab; |
| |
| if (prot->twsk_prot != NULL) { |
| prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
| |
| if (prot->twsk_prot->twsk_slab_name == NULL) |
| goto out_free_request_sock_slab; |
| |
| prot->twsk_prot->twsk_slab = |
| kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
| prot->twsk_prot->twsk_obj_size, |
| 0, |
| prot->slab_flags, |
| NULL); |
| if (prot->twsk_prot->twsk_slab == NULL) |
| goto out_free_timewait_sock_slab_name; |
| } |
| } |
| |
| mutex_lock(&proto_list_mutex); |
| list_add(&prot->node, &proto_list); |
| assign_proto_idx(prot); |
| mutex_unlock(&proto_list_mutex); |
| return 0; |
| |
| out_free_timewait_sock_slab_name: |
| kfree(prot->twsk_prot->twsk_slab_name); |
| out_free_request_sock_slab: |
| req_prot_cleanup(prot->rsk_prot); |
| |
| kmem_cache_destroy(prot->slab); |
| prot->slab = NULL; |
| out: |
| return -ENOBUFS; |
| } |
| EXPORT_SYMBOL(proto_register); |
| |
| void proto_unregister(struct proto *prot) |
| { |
| mutex_lock(&proto_list_mutex); |
| release_proto_idx(prot); |
| list_del(&prot->node); |
| mutex_unlock(&proto_list_mutex); |
| |
| kmem_cache_destroy(prot->slab); |
| prot->slab = NULL; |
| |
| req_prot_cleanup(prot->rsk_prot); |
| |
| if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
| kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
| kfree(prot->twsk_prot->twsk_slab_name); |
| prot->twsk_prot->twsk_slab = NULL; |
| } |
| } |
| EXPORT_SYMBOL(proto_unregister); |
| |
| #ifdef CONFIG_PROC_FS |
| static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
| __acquires(proto_list_mutex) |
| { |
| mutex_lock(&proto_list_mutex); |
| return seq_list_start_head(&proto_list, *pos); |
| } |
| |
| static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| return seq_list_next(v, &proto_list, pos); |
| } |
| |
| static void proto_seq_stop(struct seq_file *seq, void *v) |
| __releases(proto_list_mutex) |
| { |
| mutex_unlock(&proto_list_mutex); |
| } |
| |
| static char proto_method_implemented(const void *method) |
| { |
| return method == NULL ? 'n' : 'y'; |
| } |
| static long sock_prot_memory_allocated(struct proto *proto) |
| { |
| return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
| } |
| |
| static char *sock_prot_memory_pressure(struct proto *proto) |
| { |
| return proto->memory_pressure != NULL ? |
| proto_memory_pressure(proto) ? "yes" : "no" : "NI"; |
| } |
| |
| static void proto_seq_printf(struct seq_file *seq, struct proto *proto) |
| { |
| |
| seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
| "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
| proto->name, |
| proto->obj_size, |
| sock_prot_inuse_get(seq_file_net(seq), proto), |
| sock_prot_memory_allocated(proto), |
| sock_prot_memory_pressure(proto), |
| proto->max_header, |
| proto->slab == NULL ? "no" : "yes", |
| module_name(proto->owner), |
| proto_method_implemented(proto->close), |
| proto_method_implemented(proto->connect), |
| proto_method_implemented(proto->disconnect), |
| proto_method_implemented(proto->accept), |
| proto_method_implemented(proto->ioctl), |
| proto_method_implemented(proto->init), |
| proto_method_implemented(proto->destroy), |
| proto_method_implemented(proto->shutdown), |
| proto_method_implemented(proto->setsockopt), |
| proto_method_implemented(proto->getsockopt), |
| proto_method_implemented(proto->sendmsg), |
| proto_method_implemented(proto->recvmsg), |
| proto_method_implemented(proto->sendpage), |
| proto_method_implemented(proto->bind), |
| proto_method_implemented(proto->backlog_rcv), |
| proto_method_implemented(proto->hash), |
| proto_method_implemented(proto->unhash), |
| proto_method_implemented(proto->get_port), |
| proto_method_implemented(proto->enter_memory_pressure)); |
| } |
| |
| static int proto_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == &proto_list) |
| seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
| "protocol", |
| "size", |
| "sockets", |
| "memory", |
| "press", |
| "maxhdr", |
| "slab", |
| "module", |
| "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); |
| else |
| proto_seq_printf(seq, list_entry(v, struct proto, node)); |
| return 0; |
| } |
| |
| static const struct seq_operations proto_seq_ops = { |
| .start = proto_seq_start, |
| .next = proto_seq_next, |
| .stop = proto_seq_stop, |
| .show = proto_seq_show, |
| }; |
| |
| static int proto_seq_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_net(inode, file, &proto_seq_ops, |
| sizeof(struct seq_net_private)); |
| } |
| |
| static const struct file_operations proto_seq_fops = { |
| .owner = THIS_MODULE, |
| .open = proto_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_net, |
| }; |
| |
| static __net_init int proto_init_net(struct net *net) |
| { |
| if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static __net_exit void proto_exit_net(struct net *net) |
| { |
| remove_proc_entry("protocols", net->proc_net); |
| } |
| |
| |
| static __net_initdata struct pernet_operations proto_net_ops = { |
| .init = proto_init_net, |
| .exit = proto_exit_net, |
| }; |
| |
| static int __init proto_init(void) |
| { |
| return register_pernet_subsys(&proto_net_ops); |
| } |
| |
| subsys_initcall(proto_init); |
| |
| #endif /* PROC_FS */ |