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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/core/sock.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/core/sock.c')
-rw-r--r--net/core/sock.c1565
1 files changed, 1565 insertions, 0 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
new file mode 100644
index 00000000000..629ab4a5b45
--- /dev/null
+++ b/net/core/sock.c
@@ -0,0 +1,1565 @@
+/*
+ * 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.
+ *
+ *
+ * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
+ *
+ * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
+ * 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.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/major.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 <asm/uaccess.h>
+#include <asm/system.h>
+
+#include <linux/netdevice.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/xfrm.h>
+#include <linux/ipsec.h>
+
+#include <linux/filter.h>
+
+#ifdef CONFIG_INET
+#include <net/tcp.h>
+#endif
+
+/* 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 (sizeof(struct sk_buff) + 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 = SK_WMEM_MAX;
+__u32 sysctl_rmem_max = SK_RMEM_MAX;
+__u32 sysctl_wmem_default = SK_WMEM_MAX;
+__u32 sysctl_rmem_default = SK_RMEM_MAX;
+
+/* Maximal space eaten by iovec or ancilliary data plus some space */
+int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512);
+
+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;
+
+ *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);
+ printk(KERN_WARNING "process `%s' is using obsolete "
+ "%s SO_BSDCOMPAT\n", warncomm, name);
+ warned++;
+ }
+}
+
+static void sock_disable_timestamp(struct sock *sk)
+{
+ if (sock_flag(sk, SOCK_TIMESTAMP)) {
+ sock_reset_flag(sk, SOCK_TIMESTAMP);
+ net_disable_timestamp();
+ }
+}
+
+
+/*
+ * 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, int optlen)
+{
+ struct sock *sk=sock->sk;
+ struct sk_filter *filter;
+ int val;
+ int valbool;
+ struct linger ling;
+ int ret = 0;
+
+ /*
+ * Options without arguments
+ */
+
+#ifdef SO_DONTLINGER /* Compatibility item... */
+ switch (optname) {
+ case SO_DONTLINGER:
+ sock_reset_flag(sk, SOCK_LINGER);
+ return 0;
+ }
+#endif
+
+ 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 if (valbool)
+ sock_set_flag(sk, SOCK_DBG);
+ else
+ sock_reset_flag(sk, SOCK_DBG);
+ break;
+ case SO_REUSEADDR:
+ sk->sk_reuse = valbool;
+ break;
+ case SO_TYPE:
+ case SO_ERROR:
+ ret = -ENOPROTOOPT;
+ break;
+ case SO_DONTROUTE:
+ if (valbool)
+ sock_set_flag(sk, SOCK_LOCALROUTE);
+ else
+ sock_reset_flag(sk, SOCK_LOCALROUTE);
+ 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 */
+
+ if (val > sysctl_wmem_max)
+ val = sysctl_wmem_max;
+
+ sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
+ if ((val * 2) < SOCK_MIN_SNDBUF)
+ sk->sk_sndbuf = SOCK_MIN_SNDBUF;
+ else
+ sk->sk_sndbuf = val * 2;
+
+ /*
+ * Wake up sending tasks if we
+ * upped the value.
+ */
+ sk->sk_write_space(sk);
+ break;
+
+ 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 */
+
+ if (val > sysctl_rmem_max)
+ val = sysctl_rmem_max;
+
+ sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
+ /* FIXME: is this lower bound the right one? */
+ if ((val * 2) < SOCK_MIN_RCVBUF)
+ sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
+ else
+ sk->sk_rcvbuf = val * 2;
+ break;
+
+ case SO_KEEPALIVE:
+#ifdef CONFIG_INET
+ if (sk->sk_protocol == IPPROTO_TCP)
+ 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 = valbool;
+ break;
+
+ case SO_PRIORITY:
+ if ((val >= 0 && val <= 6) || capable(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 (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
+ sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
+ else
+#endif
+ sk->sk_lingertime = 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:
+ if (valbool) {
+ sock_set_flag(sk, SOCK_RCVTSTAMP);
+ sock_enable_timestamp(sk);
+ } else
+ sock_reset_flag(sk, SOCK_RCVTSTAMP);
+ 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;
+
+#ifdef CONFIG_NETDEVICES
+ case SO_BINDTODEVICE:
+ {
+ char devname[IFNAMSIZ];
+
+ /* Sorry... */
+ if (!capable(CAP_NET_RAW)) {
+ ret = -EPERM;
+ break;
+ }
+
+ /* 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 (!valbool) {
+ sk->sk_bound_dev_if = 0;
+ } else {
+ if (optlen > IFNAMSIZ)
+ optlen = IFNAMSIZ;
+ if (copy_from_user(devname, optval, optlen)) {
+ ret = -EFAULT;
+ break;
+ }
+
+ /* Remove any cached route for this socket. */
+ sk_dst_reset(sk);
+
+ if (devname[0] == '\0') {
+ sk->sk_bound_dev_if = 0;
+ } else {
+ struct net_device *dev = dev_get_by_name(devname);
+ if (!dev) {
+ ret = -ENODEV;
+ break;
+ }
+ sk->sk_bound_dev_if = dev->ifindex;
+ dev_put(dev);
+ }
+ }
+ break;
+ }
+#endif
+
+
+ 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_DETACH_FILTER:
+ spin_lock_bh(&sk->sk_lock.slock);
+ filter = sk->sk_filter;
+ if (filter) {
+ sk->sk_filter = NULL;
+ spin_unlock_bh(&sk->sk_lock.slock);
+ sk_filter_release(sk, filter);
+ break;
+ }
+ spin_unlock_bh(&sk->sk_lock.slock);
+ ret = -ENONET;
+ break;
+
+ /* We implement the SO_SNDLOWAT etc to
+ not be settable (1003.1g 5.3) */
+ default:
+ ret = -ENOPROTOOPT;
+ break;
+ }
+ release_sock(sk);
+ return ret;
+}
+
+
+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;
+
+ unsigned int lv = sizeof(int);
+ int len;
+
+ if(get_user(len,optlen))
+ return -EFAULT;
+ if(len < 0)
+ return -EINVAL;
+
+ 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_KEEPALIVE:
+ v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
+ break;
+
+ case SO_TYPE:
+ v.val = sk->sk_type;
+ 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;
+ 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);
+ 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) ? 1 : 0;
+ break;
+
+ case SO_PEERCRED:
+ if (len > sizeof(sk->sk_peercred))
+ len = sizeof(sk->sk_peercred);
+ if (copy_to_user(optval, &sk->sk_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_PEERSEC:
+ return security_socket_getpeersec(sock, optval, optlen, len);
+
+ default:
+ 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;
+}
+
+/**
+ * sk_alloc - All socket objects are allocated here
+ * @family - protocol family
+ * @priority - for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
+ * @prot - struct proto associated with this new sock instance
+ * @zero_it - if we should zero the newly allocated sock
+ */
+struct sock *sk_alloc(int family, int priority, struct proto *prot, int zero_it)
+{
+ struct sock *sk = NULL;
+ kmem_cache_t *slab = prot->slab;
+
+ if (slab != NULL)
+ sk = kmem_cache_alloc(slab, priority);
+ else
+ sk = kmalloc(prot->obj_size, priority);
+
+ if (sk) {
+ if (zero_it) {
+ memset(sk, 0, prot->obj_size);
+ sk->sk_family = family;
+ sk->sk_prot = prot;
+ sock_lock_init(sk);
+ }
+
+ if (security_sk_alloc(sk, family, priority)) {
+ kmem_cache_free(slab, sk);
+ sk = NULL;
+ } else
+ __module_get(prot->owner);
+ }
+ return sk;
+}
+
+void sk_free(struct sock *sk)
+{
+ struct sk_filter *filter;
+ struct module *owner = sk->sk_prot->owner;
+
+ if (sk->sk_destruct)
+ sk->sk_destruct(sk);
+
+ filter = sk->sk_filter;
+ if (filter) {
+ sk_filter_release(sk, filter);
+ sk->sk_filter = NULL;
+ }
+
+ sock_disable_timestamp(sk);
+
+ if (atomic_read(&sk->sk_omem_alloc))
+ printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
+ __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
+
+ security_sk_free(sk);
+ if (sk->sk_prot->slab != NULL)
+ kmem_cache_free(sk->sk_prot->slab, sk);
+ else
+ kfree(sk);
+ module_put(owner);
+}
+
+void __init sk_init(void)
+{
+ if (num_physpages <= 4096) {
+ sysctl_wmem_max = 32767;
+ sysctl_rmem_max = 32767;
+ sysctl_wmem_default = 32767;
+ sysctl_rmem_default = 32767;
+ } else if (num_physpages >= 131072) {
+ sysctl_wmem_max = 131071;
+ sysctl_rmem_max = 131071;
+ }
+}
+
+/*
+ * 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;
+
+ /* In case it might be waiting for more memory. */
+ atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
+ if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
+ sk->sk_write_space(sk);
+ sock_put(sk);
+}
+
+/*
+ * Read buffer destructor automatically called from kfree_skb.
+ */
+void sock_rfree(struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+
+ atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
+}
+
+
+int sock_i_uid(struct sock *sk)
+{
+ int uid;
+
+ read_lock(&sk->sk_callback_lock);
+ uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
+ read_unlock(&sk->sk_callback_lock);
+ return uid;
+}
+
+unsigned long sock_i_ino(struct sock *sk)
+{
+ unsigned long ino;
+
+ read_lock(&sk->sk_callback_lock);
+ ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
+ read_unlock(&sk->sk_callback_lock);
+ return ino;
+}
+
+/*
+ * Allocate a skb from the socket's send buffer.
+ */
+struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int 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;
+}
+
+/*
+ * Allocate a skb from the socket's receive buffer.
+ */
+struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority)
+{
+ if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
+ struct sk_buff *skb = alloc_skb(size, priority);
+ if (skb) {
+ skb_set_owner_r(skb, sk);
+ return skb;
+ }
+ }
+ return NULL;
+}
+
+/*
+ * Allocate a memory block from the socket's option memory buffer.
+ */
+void *sock_kmalloc(struct sock *sk, int size, int priority)
+{
+ if ((unsigned)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;
+}
+
+/*
+ * Free an option memory block.
+ */
+void sock_kfree_s(struct sock *sk, void *mem, int size)
+{
+ kfree(mem);
+ atomic_sub(size, &sk->sk_omem_alloc);
+}
+
+/* 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);
+
+ clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+ for (;;) {
+ if (!timeo)
+ break;
+ if (signal_pending(current))
+ break;
+ set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
+ prepare_to_wait(sk->sk_sleep, &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->sk_sleep, &wait);
+ return timeo;
+}
+
+
+/*
+ * Generic send/receive buffer handlers
+ */
+
+static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
+ unsigned long header_len,
+ unsigned long data_len,
+ int noblock, int *errcode)
+{
+ struct sk_buff *skb;
+ unsigned int gfp_mask;
+ long timeo;
+ int err;
+
+ gfp_mask = sk->sk_allocation;
+ if (gfp_mask & __GFP_WAIT)
+ gfp_mask |= __GFP_REPEAT;
+
+ timeo = sock_sndtimeo(sk, noblock);
+ while (1) {
+ err = sock_error(sk);
+ if (err != 0)
+ goto failure;
+
+ err = -EPIPE;
+ if (sk->sk_shutdown & SEND_SHUTDOWN)
+ goto failure;
+
+ if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
+ skb = alloc_skb(header_len, sk->sk_allocation);
+ if (skb) {
+ int npages;
+ int i;
+
+ /* No pages, we're done... */
+ if (!data_len)
+ break;
+
+ npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+ skb->truesize += data_len;
+ skb_shinfo(skb)->nr_frags = npages;
+ for (i = 0; i < npages; i++) {
+ struct page *page;
+ skb_frag_t *frag;
+
+ page = alloc_pages(sk->sk_allocation, 0);
+ if (!page) {
+ err = -ENOBUFS;
+ skb_shinfo(skb)->nr_frags = i;
+ kfree_skb(skb);
+ goto failure;
+ }
+
+ frag = &skb_shinfo(skb)->frags[i];
+ frag->page = page;
+ frag->page_offset = 0;
+ frag->size = (data_len >= PAGE_SIZE ?
+ PAGE_SIZE :
+ data_len);
+ data_len -= PAGE_SIZE;
+ }
+
+ /* Full success... */
+ break;
+ }
+ err = -ENOBUFS;
+ goto failure;
+ }
+ set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+ 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_set_owner_w(skb, sk);
+ return skb;
+
+interrupted:
+ err = sock_intr_errno(timeo);
+failure:
+ *errcode = err;
+ return NULL;
+}
+
+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);
+}
+
+static void __lock_sock(struct sock *sk)
+{
+ 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)
+{
+ 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;
+
+ skb->next = NULL;
+ sk->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);
+}
+
+/**
+ * sk_wait_data - wait for data to arrive at sk_receive_queue
+ * sk - sock to wait on
+ * timeo - for how long
+ *
+ * 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)
+{
+ int rc;
+ DEFINE_WAIT(wait);
+
+ prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+ set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
+ rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
+ clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
+ finish_wait(sk->sk_sleep, &wait);
+ return rc;
+}
+
+EXPORT_SYMBOL(sk_wait_data);
+
+/*
+ * 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;
+}
+
+int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
+ int len, int flags)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
+ int *len, int peer)
+{
+ return -EOPNOTSUPP;
+}
+
+unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
+{
+ return 0;
+}
+
+int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_listen(struct socket *sock, int backlog)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_shutdown(struct socket *sock, int how)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_setsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int optlen)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
+ size_t len)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
+ size_t len, int flags)
+{
+ return -EOPNOTSUPP;
+}
+
+int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
+{
+ /* Mirror missing mmap method error code */
+ return -ENODEV;
+}
+
+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;
+}
+
+/*
+ * Default Socket Callbacks
+ */
+
+static void sock_def_wakeup(struct sock *sk)
+{
+ read_lock(&sk->sk_callback_lock);
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible_all(sk->sk_sleep);
+ read_unlock(&sk->sk_callback_lock);
+}
+
+static void sock_def_error_report(struct sock *sk)
+{
+ read_lock(&sk->sk_callback_lock);
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible(sk->sk_sleep);
+ sk_wake_async(sk,0,POLL_ERR);
+ read_unlock(&sk->sk_callback_lock);
+}
+
+static void sock_def_readable(struct sock *sk, int len)
+{
+ read_lock(&sk->sk_callback_lock);
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible(sk->sk_sleep);
+ sk_wake_async(sk,1,POLL_IN);
+ read_unlock(&sk->sk_callback_lock);
+}
+
+static void sock_def_write_space(struct sock *sk)
+{
+ read_lock(&sk->sk_callback_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) {
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible(sk->sk_sleep);
+
+ /* Should agree with poll, otherwise some programs break */
+ if (sock_writeable(sk))
+ sk_wake_async(sk, 2, POLL_OUT);
+ }
+
+ read_unlock(&sk->sk_callback_lock);
+}
+
+static void sock_def_destruct(struct sock *sk)
+{
+ if (sk->sk_protinfo)
+ kfree(sk->sk_protinfo);
+}
+
+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, 3, POLL_PRI);
+}
+
+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 (timer_pending(timer) && 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->sk_socket = sock;
+
+ sock_set_flag(sk, SOCK_ZAPPED);
+
+ if(sock)
+ {
+ sk->sk_type = sock->type;
+ sk->sk_sleep = &sock->wait;
+ sock->sk = sk;
+ } else
+ sk->sk_sleep = NULL;
+
+ rwlock_init(&sk->sk_dst_lock);
+ rwlock_init(&sk->sk_callback_lock);
+
+ 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_sndmsg_page = NULL;
+ sk->sk_sndmsg_off = 0;
+
+ sk->sk_peercred.pid = 0;
+ sk->sk_peercred.uid = -1;
+ sk->sk_peercred.gid = -1;
+ sk->sk_write_pending = 0;
+ sk->sk_rcvlowat = 1;
+ sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
+ sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
+
+ sk->sk_stamp.tv_sec = -1L;
+ sk->sk_stamp.tv_usec = -1L;
+
+ atomic_set(&sk->sk_refcnt, 1);
+}
+
+void fastcall lock_sock(struct sock *sk)
+{
+ might_sleep();
+ spin_lock_bh(&(sk->sk_lock.slock));
+ if (sk->sk_lock.owner)
+ __lock_sock(sk);
+ sk->sk_lock.owner = (void *)1;
+ spin_unlock_bh(&(sk->sk_lock.slock));
+}
+
+EXPORT_SYMBOL(lock_sock);
+
+void fastcall release_sock(struct sock *sk)
+{
+ spin_lock_bh(&(sk->sk_lock.slock));
+ if (sk->sk_backlog.tail)
+ __release_sock(sk);
+ sk->sk_lock.owner = NULL;
+ if (waitqueue_active(&(sk->sk_lock.wq)))
+ wake_up(&(sk->sk_lock.wq));
+ spin_unlock_bh(&(sk->sk_lock.slock));
+}
+EXPORT_SYMBOL(release_sock);
+
+int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
+{
+ if (!sock_flag(sk, SOCK_TIMESTAMP))
+ sock_enable_timestamp(sk);
+ if (sk->sk_stamp.tv_sec == -1)
+ return -ENOENT;
+ if (sk->sk_stamp.tv_sec == 0)
+ do_gettimeofday(&sk->sk_stamp);
+ return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ?
+ -EFAULT : 0;
+}
+EXPORT_SYMBOL(sock_get_timestamp);
+
+void sock_enable_timestamp(struct sock *sk)
+{
+ if (!sock_flag(sk, SOCK_TIMESTAMP)) {
+ sock_set_flag(sk, SOCK_TIMESTAMP);
+ net_enable_timestamp();
+ }
+}
+EXPORT_SYMBOL(sock_enable_timestamp);
+
+/*
+ * 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);
+
+int sock_common_recvmsg(struct kiocb *iocb, 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(iocb, 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, int optlen)
+{
+ struct sock *sk = sock->sk;
+
+ return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
+}
+
+EXPORT_SYMBOL(sock_common_setsockopt);
+
+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);
+
+#ifdef INET_REFCNT_DEBUG
+ if (atomic_read(&sk->sk_refcnt) != 1)
+ printk(KERN_DEBUG "Destruction of the socket %p delayed, c=%d\n",
+ sk, atomic_read(&sk->sk_refcnt));
+#endif
+ sock_put(sk);
+}
+
+EXPORT_SYMBOL(sk_common_release);
+
+static DEFINE_RWLOCK(proto_list_lock);
+static LIST_HEAD(proto_list);
+
+int proto_register(struct proto *prot, int alloc_slab)
+{
+ int rc = -ENOBUFS;
+
+ write_lock(&proto_list_lock);
+
+ if (alloc_slab) {
+ prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
+ SLAB_HWCACHE_ALIGN, NULL, NULL);
+
+ if (prot->slab == NULL) {
+ printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
+ prot->name);
+ goto out_unlock;
+ }
+ }
+
+ list_add(&prot->node, &proto_list);
+ rc = 0;
+out_unlock:
+ write_unlock(&proto_list_lock);
+ return rc;
+}
+
+EXPORT_SYMBOL(proto_register);
+
+void proto_unregister(struct proto *prot)
+{
+ write_lock(&proto_list_lock);
+
+ if (prot->slab != NULL) {
+ kmem_cache_destroy(prot->slab);
+ prot->slab = NULL;
+ }
+
+ list_del(&prot->node);
+ write_unlock(&proto_list_lock);
+}
+
+EXPORT_SYMBOL(proto_unregister);
+
+#ifdef CONFIG_PROC_FS
+static inline struct proto *__proto_head(void)
+{
+ return list_entry(proto_list.next, struct proto, node);
+}
+
+static inline struct proto *proto_head(void)
+{
+ return list_empty(&proto_list) ? NULL : __proto_head();
+}
+
+static inline struct proto *proto_next(struct proto *proto)
+{
+ return proto->node.next == &proto_list ? NULL :
+ list_entry(proto->node.next, struct proto, node);
+}
+
+static inline struct proto *proto_get_idx(loff_t pos)
+{
+ struct proto *proto;
+ loff_t i = 0;
+
+ list_for_each_entry(proto, &proto_list, node)
+ if (i++ == pos)
+ goto out;
+
+ proto = NULL;
+out:
+ return proto;
+}
+
+static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ read_lock(&proto_list_lock);
+ return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ ++*pos;
+ return v == SEQ_START_TOKEN ? proto_head() : proto_next(v);
+}
+
+static void proto_seq_stop(struct seq_file *seq, void *v)
+{
+ read_unlock(&proto_list_lock);
+}
+
+static char proto_method_implemented(const void *method)
+{
+ return method == NULL ? 'n' : 'y';
+}
+
+static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
+{
+ seq_printf(seq, "%-9s %4u %6d %6d %-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,
+ proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
+ proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
+ proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
+ 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 == SEQ_START_TOKEN)
+ 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, v);
+ return 0;
+}
+
+static 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(file, &proto_seq_ops);
+}
+
+static struct file_operations proto_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = proto_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static int __init proto_init(void)
+{
+ /* register /proc/net/protocols */
+ return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
+}
+
+subsys_initcall(proto_init);
+
+#endif /* PROC_FS */
+
+EXPORT_SYMBOL(sk_alloc);
+EXPORT_SYMBOL(sk_free);
+EXPORT_SYMBOL(sk_send_sigurg);
+EXPORT_SYMBOL(sock_alloc_send_skb);
+EXPORT_SYMBOL(sock_init_data);
+EXPORT_SYMBOL(sock_kfree_s);
+EXPORT_SYMBOL(sock_kmalloc);
+EXPORT_SYMBOL(sock_no_accept);
+EXPORT_SYMBOL(sock_no_bind);
+EXPORT_SYMBOL(sock_no_connect);
+EXPORT_SYMBOL(sock_no_getname);
+EXPORT_SYMBOL(sock_no_getsockopt);
+EXPORT_SYMBOL(sock_no_ioctl);
+EXPORT_SYMBOL(sock_no_listen);
+EXPORT_SYMBOL(sock_no_mmap);
+EXPORT_SYMBOL(sock_no_poll);
+EXPORT_SYMBOL(sock_no_recvmsg);
+EXPORT_SYMBOL(sock_no_sendmsg);
+EXPORT_SYMBOL(sock_no_sendpage);
+EXPORT_SYMBOL(sock_no_setsockopt);
+EXPORT_SYMBOL(sock_no_shutdown);
+EXPORT_SYMBOL(sock_no_socketpair);
+EXPORT_SYMBOL(sock_rfree);
+EXPORT_SYMBOL(sock_setsockopt);
+EXPORT_SYMBOL(sock_wfree);
+EXPORT_SYMBOL(sock_wmalloc);
+EXPORT_SYMBOL(sock_i_uid);
+EXPORT_SYMBOL(sock_i_ino);
+#ifdef CONFIG_SYSCTL
+EXPORT_SYMBOL(sysctl_optmem_max);
+EXPORT_SYMBOL(sysctl_rmem_max);
+EXPORT_SYMBOL(sysctl_wmem_max);
+#endif