Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/socket.c b/net/socket.c
index 390a8ec..d7a1060 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* NET An implementation of the SOCKET network access protocol.
*
@@ -45,13 +46,6 @@
* Tigran Aivazian : Made listen(2) backlog sanity checks
* protocol-independent
*
- *
- * 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.
- *
- *
* This module is effectively the top level interface to the BSD socket
* paradigm.
*
@@ -79,6 +73,7 @@
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/mount.h>
+#include <linux/pseudo_fs.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/compat.h>
@@ -90,6 +85,7 @@
#include <linux/slab.h>
#include <linux/xattr.h>
#include <linux/nospec.h>
+#include <linux/indirect_call_wrapper.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
@@ -239,20 +235,13 @@
static struct inode *sock_alloc_inode(struct super_block *sb)
{
struct socket_alloc *ei;
- struct socket_wq *wq;
ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
- wq = kmalloc(sizeof(*wq), GFP_KERNEL);
- if (!wq) {
- kmem_cache_free(sock_inode_cachep, ei);
- return NULL;
- }
- init_waitqueue_head(&wq->wait);
- wq->fasync_list = NULL;
- wq->flags = 0;
- ei->socket.wq = wq;
+ init_waitqueue_head(&ei->socket.wq.wait);
+ ei->socket.wq.fasync_list = NULL;
+ ei->socket.wq.flags = 0;
ei->socket.state = SS_UNCONNECTED;
ei->socket.flags = 0;
@@ -263,12 +252,11 @@
return &ei->vfs_inode;
}
-static void sock_destroy_inode(struct inode *inode)
+static void sock_free_inode(struct inode *inode)
{
struct socket_alloc *ei;
ei = container_of(inode, struct socket_alloc, vfs_inode);
- kfree_rcu(ei->socket.wq, rcu);
kmem_cache_free(sock_inode_cachep, ei);
}
@@ -293,7 +281,7 @@
static const struct super_operations sockfs_ops = {
.alloc_inode = sock_alloc_inode,
- .destroy_inode = sock_destroy_inode,
+ .free_inode = sock_free_inode,
.statfs = simple_statfs,
};
@@ -351,19 +339,22 @@
NULL
};
-static struct dentry *sockfs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int sockfs_init_fs_context(struct fs_context *fc)
{
- return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
- sockfs_xattr_handlers,
- &sockfs_dentry_operations, SOCKFS_MAGIC);
+ struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
+ if (!ctx)
+ return -ENOMEM;
+ ctx->ops = &sockfs_ops;
+ ctx->dops = &sockfs_dentry_operations;
+ ctx->xattr = sockfs_xattr_handlers;
+ return 0;
}
static struct vfsmount *sock_mnt __read_mostly;
static struct file_system_type sock_fs_type = {
.name = "sockfs",
- .mount = sockfs_mount,
+ .init_fs_context = sockfs_init_fs_context,
.kill_sb = kill_anon_super,
};
@@ -384,6 +375,18 @@
* but we take care of internal coherence yet.
*/
+/**
+ * sock_alloc_file - Bind a &socket to a &file
+ * @sock: socket
+ * @flags: file status flags
+ * @dname: protocol name
+ *
+ * Returns the &file bound with @sock, implicitly storing it
+ * in sock->file. If dname is %NULL, sets to "".
+ * On failure the return is a ERR pointer (see linux/err.h).
+ * This function uses GFP_KERNEL internally.
+ */
+
struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
{
struct file *file;
@@ -415,7 +418,7 @@
}
newfile = sock_alloc_file(sock, flags, NULL);
- if (likely(!IS_ERR(newfile))) {
+ if (!IS_ERR(newfile)) {
fd_install(fd, newfile);
return fd;
}
@@ -424,6 +427,14 @@
return PTR_ERR(newfile);
}
+/**
+ * sock_from_file - Return the &socket bounded to @file.
+ * @file: file
+ * @err: pointer to an error code return
+ *
+ * On failure returns %NULL and assigns -ENOTSOCK to @err.
+ */
+
struct socket *sock_from_file(struct file *file, int *err)
{
if (file->f_op == &socket_file_ops)
@@ -532,11 +543,11 @@
};
/**
- * sock_alloc - allocate a socket
+ * sock_alloc - allocate a socket
*
* Allocate a new inode and socket object. The two are bound together
* and initialised. The socket is then returned. If we are out of inodes
- * NULL is returned.
+ * NULL is returned. This functions uses GFP_KERNEL internally.
*/
struct socket *sock_alloc(void)
@@ -561,7 +572,7 @@
EXPORT_SYMBOL(sock_alloc);
/**
- * sock_release - close a socket
+ * sock_release - close a socket
* @sock: socket to close
*
* The socket is released from the protocol stack if it has a release
@@ -577,13 +588,14 @@
if (inode)
inode_lock(inode);
sock->ops->release(sock);
+ sock->sk = NULL;
if (inode)
inode_unlock(inode);
sock->ops = NULL;
module_put(owner);
}
- if (sock->wq->fasync_list)
+ if (sock->wq.fasync_list)
pr_err("%s: fasync list not empty!\n", __func__);
if (!sock->file) {
@@ -616,13 +628,27 @@
}
EXPORT_SYMBOL(__sock_tx_timestamp);
+INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
+ size_t));
+INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
+ size_t));
static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
{
- int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
+ int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg,
+ inet_sendmsg, sock, msg,
+ msg_data_left(msg));
BUG_ON(ret == -EIOCBQUEUED);
return ret;
}
+/**
+ * sock_sendmsg - send a message through @sock
+ * @sock: socket
+ * @msg: message to send
+ *
+ * Sends @msg through @sock, passing through LSM.
+ * Returns the number of bytes sent, or an error code.
+ */
int sock_sendmsg(struct socket *sock, struct msghdr *msg)
{
int err = security_socket_sendmsg(sock, msg,
@@ -632,14 +658,39 @@
}
EXPORT_SYMBOL(sock_sendmsg);
+/**
+ * kernel_sendmsg - send a message through @sock (kernel-space)
+ * @sock: socket
+ * @msg: message header
+ * @vec: kernel vec
+ * @num: vec array length
+ * @size: total message data size
+ *
+ * Builds the message data with @vec and sends it through @sock.
+ * Returns the number of bytes sent, or an error code.
+ */
+
int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
struct kvec *vec, size_t num, size_t size)
{
- iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
+ iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
return sock_sendmsg(sock, msg);
}
EXPORT_SYMBOL(kernel_sendmsg);
+/**
+ * kernel_sendmsg_locked - send a message through @sock (kernel-space)
+ * @sk: sock
+ * @msg: message header
+ * @vec: output s/g array
+ * @num: output s/g array length
+ * @size: total message data size
+ *
+ * Builds the message data with @vec and sends it through @sock.
+ * Returns the number of bytes sent, or an error code.
+ * Caller must hold @sk.
+ */
+
int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
struct kvec *vec, size_t num, size_t size)
{
@@ -648,7 +699,7 @@
if (!sock->ops->sendmsg_locked)
return sock_no_sendmsg_locked(sk, msg, size);
- iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
+ iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
}
@@ -669,7 +720,7 @@
* before the software timestamp is received, a hardware TX timestamp may be
* returned only if there is no software TX timestamp. Ignore false software
* timestamps, which may be made in the __sock_recv_timestamp() call when the
- * option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a
+ * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
* hardware timestamp.
*/
static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
@@ -705,7 +756,9 @@
struct sk_buff *skb)
{
int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
- struct scm_timestamping tss;
+ int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
+ struct scm_timestamping_internal tss;
+
int empty = 1, false_tstamp = 0;
struct skb_shared_hwtstamps *shhwtstamps =
skb_hwtstamps(skb);
@@ -719,34 +772,54 @@
if (need_software_tstamp) {
if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
- struct timeval tv;
- skb_get_timestamp(skb, &tv);
- put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
- sizeof(tv), &tv);
+ if (new_tstamp) {
+ struct __kernel_sock_timeval tv;
+
+ skb_get_new_timestamp(skb, &tv);
+ put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
+ sizeof(tv), &tv);
+ } else {
+ struct __kernel_old_timeval tv;
+
+ skb_get_timestamp(skb, &tv);
+ put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
+ sizeof(tv), &tv);
+ }
} else {
- struct timespec ts;
- skb_get_timestampns(skb, &ts);
- put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
- sizeof(ts), &ts);
+ if (new_tstamp) {
+ struct __kernel_timespec ts;
+
+ skb_get_new_timestampns(skb, &ts);
+ put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
+ sizeof(ts), &ts);
+ } else {
+ struct timespec ts;
+
+ skb_get_timestampns(skb, &ts);
+ put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
+ sizeof(ts), &ts);
+ }
}
}
memset(&tss, 0, sizeof(tss));
if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
- ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
+ ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0))
empty = 0;
if (shhwtstamps &&
(sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
!skb_is_swtx_tstamp(skb, false_tstamp) &&
- ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
+ ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
empty = 0;
if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
!skb_is_err_queue(skb))
put_ts_pktinfo(msg, skb);
}
if (!empty) {
- put_cmsg(msg, SOL_SOCKET,
- SCM_TIMESTAMPING, sizeof(tss), &tss);
+ if (sock_flag(sk, SOCK_TSTAMP_NEW))
+ put_cmsg_scm_timestamping64(msg, &tss);
+ else
+ put_cmsg_scm_timestamping(msg, &tss);
if (skb_is_err_queue(skb) && skb->len &&
SKB_EXT_ERR(skb)->opt_stats)
@@ -788,12 +861,27 @@
}
EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
+INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
+ size_t, int));
+INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
+ size_t, int));
static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
int flags)
{
- return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
+ return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg,
+ inet_recvmsg, sock, msg, msg_data_left(msg),
+ flags);
}
+/**
+ * sock_recvmsg - receive a message from @sock
+ * @sock: socket
+ * @msg: message to receive
+ * @flags: message flags
+ *
+ * Receives @msg from @sock, passing through LSM. Returns the total number
+ * of bytes received, or an error.
+ */
int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
{
int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
@@ -803,27 +891,28 @@
EXPORT_SYMBOL(sock_recvmsg);
/**
- * kernel_recvmsg - Receive a message from a socket (kernel space)
- * @sock: The socket to receive the message from
- * @msg: Received message
- * @vec: Input s/g array for message data
- * @num: Size of input s/g array
- * @size: Number of bytes to read
- * @flags: Message flags (MSG_DONTWAIT, etc...)
+ * kernel_recvmsg - Receive a message from a socket (kernel space)
+ * @sock: The socket to receive the message from
+ * @msg: Received message
+ * @vec: Input s/g array for message data
+ * @num: Size of input s/g array
+ * @size: Number of bytes to read
+ * @flags: Message flags (MSG_DONTWAIT, etc...)
*
- * On return the msg structure contains the scatter/gather array passed in the
- * vec argument. The array is modified so that it consists of the unfilled
- * portion of the original array.
+ * On return the msg structure contains the scatter/gather array passed in the
+ * vec argument. The array is modified so that it consists of the unfilled
+ * portion of the original array.
*
- * The returned value is the total number of bytes received, or an error.
+ * The returned value is the total number of bytes received, or an error.
*/
+
int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
struct kvec *vec, size_t num, size_t size, int flags)
{
mm_segment_t oldfs = get_fs();
int result;
- iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
+ iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
set_fs(KERNEL_DS);
result = sock_recvmsg(sock, msg, flags);
set_fs(oldfs);
@@ -853,7 +942,7 @@
struct socket *sock = file->private_data;
if (unlikely(!sock->ops->splice_read))
- return -EINVAL;
+ return generic_file_splice_read(file, ppos, pipe, len, flags);
return sock->ops->splice_read(sock, ppos, pipe, len, flags);
}
@@ -941,8 +1030,7 @@
EXPORT_SYMBOL(dlci_ioctl_set);
static long sock_do_ioctl(struct net *net, struct socket *sock,
- unsigned int cmd, unsigned long arg,
- unsigned int ifreq_size)
+ unsigned int cmd, unsigned long arg)
{
int err;
void __user *argp = (void __user *)arg;
@@ -968,11 +1056,11 @@
} else {
struct ifreq ifr;
bool need_copyout;
- if (copy_from_user(&ifr, argp, ifreq_size))
+ if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
return -EFAULT;
err = dev_ioctl(net, cmd, &ifr, &need_copyout);
if (!err && need_copyout)
- if (copy_to_user(argp, &ifr, ifreq_size))
+ if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
return -EFAULT;
}
return err;
@@ -983,6 +1071,13 @@
* what to do with it - that's up to the protocol still.
*/
+/**
+ * get_net_ns - increment the refcount of the network namespace
+ * @ns: common namespace (net)
+ *
+ * Returns the net's common namespace.
+ */
+
struct ns_common *get_net_ns(struct ns_common *ns)
{
return &get_net(container_of(ns, struct net, ns))->ns;
@@ -1070,14 +1165,46 @@
err = open_related_ns(&net->ns, get_net_ns);
break;
+ case SIOCGSTAMP_OLD:
+ case SIOCGSTAMPNS_OLD:
+ if (!sock->ops->gettstamp) {
+ err = -ENOIOCTLCMD;
+ break;
+ }
+ err = sock->ops->gettstamp(sock, argp,
+ cmd == SIOCGSTAMP_OLD,
+ !IS_ENABLED(CONFIG_64BIT));
+ break;
+ case SIOCGSTAMP_NEW:
+ case SIOCGSTAMPNS_NEW:
+ if (!sock->ops->gettstamp) {
+ err = -ENOIOCTLCMD;
+ break;
+ }
+ err = sock->ops->gettstamp(sock, argp,
+ cmd == SIOCGSTAMP_NEW,
+ false);
+ break;
default:
- err = sock_do_ioctl(net, sock, cmd, arg,
- sizeof(struct ifreq));
+ err = sock_do_ioctl(net, sock, cmd, arg);
break;
}
return err;
}
+/**
+ * sock_create_lite - creates a socket
+ * @family: protocol family (AF_INET, ...)
+ * @type: communication type (SOCK_STREAM, ...)
+ * @protocol: protocol (0, ...)
+ * @res: new socket
+ *
+ * Creates a new socket and assigns it to @res, passing through LSM.
+ * The new socket initialization is not complete, see kernel_accept().
+ * Returns 0 or an error. On failure @res is set to %NULL.
+ * This function internally uses GFP_KERNEL.
+ */
+
int sock_create_lite(int family, int type, int protocol, struct socket **res)
{
int err;
@@ -1157,13 +1284,12 @@
{
struct socket *sock = filp->private_data;
struct sock *sk = sock->sk;
- struct socket_wq *wq;
+ struct socket_wq *wq = &sock->wq;
if (sk == NULL)
return -EINVAL;
lock_sock(sk);
- wq = sock->wq;
fasync_helper(fd, filp, on, &wq->fasync_list);
if (!wq->fasync_list)
@@ -1203,6 +1329,21 @@
}
EXPORT_SYMBOL(sock_wake_async);
+/**
+ * __sock_create - creates a socket
+ * @net: net namespace
+ * @family: protocol family (AF_INET, ...)
+ * @type: communication type (SOCK_STREAM, ...)
+ * @protocol: protocol (0, ...)
+ * @res: new socket
+ * @kern: boolean for kernel space sockets
+ *
+ * Creates a new socket and assigns it to @res, passing through LSM.
+ * Returns 0 or an error. On failure @res is set to %NULL. @kern must
+ * be set to true if the socket resides in kernel space.
+ * This function internally uses GFP_KERNEL.
+ */
+
int __sock_create(struct net *net, int family, int type, int protocol,
struct socket **res, int kern)
{
@@ -1312,12 +1453,35 @@
}
EXPORT_SYMBOL(__sock_create);
+/**
+ * sock_create - creates a socket
+ * @family: protocol family (AF_INET, ...)
+ * @type: communication type (SOCK_STREAM, ...)
+ * @protocol: protocol (0, ...)
+ * @res: new socket
+ *
+ * A wrapper around __sock_create().
+ * Returns 0 or an error. This function internally uses GFP_KERNEL.
+ */
+
int sock_create(int family, int type, int protocol, struct socket **res)
{
return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
}
EXPORT_SYMBOL(sock_create);
+/**
+ * sock_create_kern - creates a socket (kernel space)
+ * @net: net namespace
+ * @family: protocol family (AF_INET, ...)
+ * @type: communication type (SOCK_STREAM, ...)
+ * @protocol: protocol (0, ...)
+ * @res: new socket
+ *
+ * A wrapper around __sock_create().
+ * Returns 0 or an error. This function internally uses GFP_KERNEL.
+ */
+
int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
{
return __sock_create(net, family, type, protocol, res, 1);
@@ -1475,7 +1639,7 @@
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock) {
err = move_addr_to_kernel(umyaddr, addrlen, &address);
- if (err >= 0) {
+ if (!err) {
err = security_socket_bind(sock,
(struct sockaddr *)&address,
addrlen);
@@ -1881,6 +2045,8 @@
static int __sys_setsockopt(int fd, int level, int optname,
char __user *optval, int optlen)
{
+ mm_segment_t oldfs = get_fs();
+ char *kernel_optval = NULL;
int err, fput_needed;
struct socket *sock;
@@ -1893,6 +2059,22 @@
if (err)
goto out_put;
+ err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level,
+ &optname, optval, &optlen,
+ &kernel_optval);
+
+ if (err < 0) {
+ goto out_put;
+ } else if (err > 0) {
+ err = 0;
+ goto out_put;
+ }
+
+ if (kernel_optval) {
+ set_fs(KERNEL_DS);
+ optval = (char __user __force *)kernel_optval;
+ }
+
if (level == SOL_SOCKET)
err =
sock_setsockopt(sock, level, optname, optval,
@@ -1901,6 +2083,11 @@
err =
sock->ops->setsockopt(sock, level, optname, optval,
optlen);
+
+ if (kernel_optval) {
+ set_fs(oldfs);
+ kfree(kernel_optval);
+ }
out_put:
fput_light(sock->file, fput_needed);
}
@@ -1923,6 +2110,7 @@
{
int err, fput_needed;
struct socket *sock;
+ int max_optlen;
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock != NULL) {
@@ -1930,6 +2118,8 @@
if (err)
goto out_put;
+ max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
+
if (level == SOL_SOCKET)
err =
sock_getsockopt(sock, level, optname, optval,
@@ -1938,6 +2128,10 @@
err =
sock->ops->getsockopt(sock, level, optname, optval,
optlen);
+
+ err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
+ optval, optlen,
+ max_optlen, err);
out_put:
fput_light(sock->file, fput_needed);
}
@@ -2032,20 +2226,16 @@
kmsg->msg_iocb = NULL;
- return import_iovec(save_addr ? READ : WRITE,
+ err = import_iovec(save_addr ? READ : WRITE,
msg.msg_iov, msg.msg_iovlen,
UIO_FASTIOV, iov, &kmsg->msg_iter);
+ return err < 0 ? err : 0;
}
-static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
- struct msghdr *msg_sys, unsigned int flags,
- struct used_address *used_address,
- unsigned int allowed_msghdr_flags)
+static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,
+ unsigned int flags, struct used_address *used_address,
+ unsigned int allowed_msghdr_flags)
{
- struct compat_msghdr __user *msg_compat =
- (struct compat_msghdr __user *)msg;
- struct sockaddr_storage address;
- struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
unsigned char ctl[sizeof(struct cmsghdr) + 20]
__aligned(sizeof(__kernel_size_t));
/* 20 is size of ipv6_pktinfo */
@@ -2053,19 +2243,10 @@
int ctl_len;
ssize_t err;
- msg_sys->msg_name = &address;
-
- if (MSG_CMSG_COMPAT & flags)
- err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
- else
- err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
- if (err < 0)
- return err;
-
err = -ENOBUFS;
if (msg_sys->msg_controllen > INT_MAX)
- goto out_freeiov;
+ goto out;
flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
ctl_len = msg_sys->msg_controllen;
if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
@@ -2073,7 +2254,7 @@
cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
sizeof(ctl));
if (err)
- goto out_freeiov;
+ goto out;
ctl_buf = msg_sys->msg_control;
ctl_len = msg_sys->msg_controllen;
} else if (ctl_len) {
@@ -2082,7 +2263,7 @@
if (ctl_len > sizeof(ctl)) {
ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
if (ctl_buf == NULL)
- goto out_freeiov;
+ goto out;
}
err = -EFAULT;
/*
@@ -2128,7 +2309,47 @@
out_freectl:
if (ctl_buf != ctl)
sock_kfree_s(sock->sk, ctl_buf, ctl_len);
-out_freeiov:
+out:
+ return err;
+}
+
+static int sendmsg_copy_msghdr(struct msghdr *msg,
+ struct user_msghdr __user *umsg, unsigned flags,
+ struct iovec **iov)
+{
+ int err;
+
+ if (flags & MSG_CMSG_COMPAT) {
+ struct compat_msghdr __user *msg_compat;
+
+ msg_compat = (struct compat_msghdr __user *) umsg;
+ err = get_compat_msghdr(msg, msg_compat, NULL, iov);
+ } else {
+ err = copy_msghdr_from_user(msg, umsg, NULL, iov);
+ }
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
+ struct msghdr *msg_sys, unsigned int flags,
+ struct used_address *used_address,
+ unsigned int allowed_msghdr_flags)
+{
+ struct sockaddr_storage address;
+ struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
+ ssize_t err;
+
+ msg_sys->msg_name = &address;
+
+ err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov);
+ if (err < 0)
+ return err;
+
+ err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
+ allowed_msghdr_flags);
kfree(iov);
return err;
}
@@ -2136,6 +2357,28 @@
/*
* BSD sendmsg interface
*/
+long __sys_sendmsg_sock(struct socket *sock, struct user_msghdr __user *umsg,
+ unsigned int flags)
+{
+ struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
+ struct sockaddr_storage address;
+ struct msghdr msg = { .msg_name = &address };
+ ssize_t err;
+
+ err = sendmsg_copy_msghdr(&msg, umsg, flags, &iov);
+ if (err)
+ return err;
+ /* disallow ancillary data requests from this path */
+ if (msg.msg_control || msg.msg_controllen) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = ____sys_sendmsg(sock, &msg, flags, NULL, 0);
+out:
+ kfree(iov);
+ return err;
+}
long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
bool forbid_cmsg_compat)
@@ -2240,33 +2483,41 @@
return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
}
-static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
- struct msghdr *msg_sys, unsigned int flags, int nosec)
+static int recvmsg_copy_msghdr(struct msghdr *msg,
+ struct user_msghdr __user *umsg, unsigned flags,
+ struct sockaddr __user **uaddr,
+ struct iovec **iov)
+{
+ ssize_t err;
+
+ if (MSG_CMSG_COMPAT & flags) {
+ struct compat_msghdr __user *msg_compat;
+
+ msg_compat = (struct compat_msghdr __user *) umsg;
+ err = get_compat_msghdr(msg, msg_compat, uaddr, iov);
+ } else {
+ err = copy_msghdr_from_user(msg, umsg, uaddr, iov);
+ }
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,
+ struct user_msghdr __user *msg,
+ struct sockaddr __user *uaddr,
+ unsigned int flags, int nosec)
{
struct compat_msghdr __user *msg_compat =
- (struct compat_msghdr __user *)msg;
- struct iovec iovstack[UIO_FASTIOV];
- struct iovec *iov = iovstack;
+ (struct compat_msghdr __user *) msg;
+ int __user *uaddr_len = COMPAT_NAMELEN(msg);
+ struct sockaddr_storage addr;
unsigned long cmsg_ptr;
int len;
ssize_t err;
- /* kernel mode address */
- struct sockaddr_storage addr;
-
- /* user mode address pointers */
- struct sockaddr __user *uaddr;
- int __user *uaddr_len = COMPAT_NAMELEN(msg);
-
msg_sys->msg_name = &addr;
-
- if (MSG_CMSG_COMPAT & flags)
- err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
- else
- err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
- if (err < 0)
- return err;
-
cmsg_ptr = (unsigned long)msg_sys->msg_control;
msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
@@ -2277,7 +2528,7 @@
flags |= MSG_DONTWAIT;
err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
if (err < 0)
- goto out_freeiov;
+ goto out;
len = err;
if (uaddr != NULL) {
@@ -2285,12 +2536,12 @@
msg_sys->msg_namelen, uaddr,
uaddr_len);
if (err < 0)
- goto out_freeiov;
+ goto out;
}
err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
COMPAT_FLAGS(msg));
if (err)
- goto out_freeiov;
+ goto out;
if (MSG_CMSG_COMPAT & flags)
err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
&msg_compat->msg_controllen);
@@ -2298,10 +2549,25 @@
err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
&msg->msg_controllen);
if (err)
- goto out_freeiov;
+ goto out;
err = len;
+out:
+ return err;
+}
-out_freeiov:
+static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
+ struct msghdr *msg_sys, unsigned int flags, int nosec)
+{
+ struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
+ /* user mode address pointers */
+ struct sockaddr __user *uaddr;
+ ssize_t err;
+
+ err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov);
+ if (err < 0)
+ return err;
+
+ err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
kfree(iov);
return err;
}
@@ -2310,6 +2576,30 @@
* BSD recvmsg interface
*/
+long __sys_recvmsg_sock(struct socket *sock, struct user_msghdr __user *umsg,
+ unsigned int flags)
+{
+ struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
+ struct sockaddr_storage address;
+ struct msghdr msg = { .msg_name = &address };
+ struct sockaddr __user *uaddr;
+ ssize_t err;
+
+ err = recvmsg_copy_msghdr(&msg, umsg, flags, &uaddr, &iov);
+ if (err)
+ return err;
+ /* disallow ancillary data requests from this path */
+ if (msg.msg_control || msg.msg_controllen) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = ____sys_recvmsg(sock, &msg, umsg, uaddr, flags, 0);
+out:
+ kfree(iov);
+ return err;
+}
+
long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
bool forbid_cmsg_compat)
{
@@ -2341,8 +2631,9 @@
* Linux recvmmsg interface
*/
-int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
- unsigned int flags, struct timespec *timeout)
+static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
+ unsigned int vlen, unsigned int flags,
+ struct timespec64 *timeout)
{
int fput_needed, err, datagrams;
struct socket *sock;
@@ -2407,8 +2698,7 @@
if (timeout) {
ktime_get_ts64(&timeout64);
- *timeout = timespec64_to_timespec(
- timespec64_sub(end_time, timeout64));
+ *timeout = timespec64_sub(end_time, timeout64);
if (timeout->tv_sec < 0) {
timeout->tv_sec = timeout->tv_nsec = 0;
break;
@@ -2452,26 +2742,32 @@
return datagrams;
}
-static int do_sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
- unsigned int vlen, unsigned int flags,
- struct timespec __user *timeout)
+int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
+ unsigned int vlen, unsigned int flags,
+ struct __kernel_timespec __user *timeout,
+ struct old_timespec32 __user *timeout32)
{
int datagrams;
- struct timespec timeout_sys;
+ struct timespec64 timeout_sys;
- if (flags & MSG_CMSG_COMPAT)
- return -EINVAL;
-
- if (!timeout)
- return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
-
- if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
+ if (timeout && get_timespec64(&timeout_sys, timeout))
return -EFAULT;
- datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
+ if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
+ return -EFAULT;
- if (datagrams > 0 &&
- copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
+ if (!timeout && !timeout32)
+ return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
+
+ datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
+
+ if (datagrams <= 0)
+ return datagrams;
+
+ if (timeout && put_timespec64(&timeout_sys, timeout))
+ datagrams = -EFAULT;
+
+ if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
datagrams = -EFAULT;
return datagrams;
@@ -2479,11 +2775,26 @@
SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
unsigned int, vlen, unsigned int, flags,
- struct timespec __user *, timeout)
+ struct __kernel_timespec __user *, timeout)
{
- return do_sys_recvmmsg(fd, mmsg, vlen, flags, timeout);
+ if (flags & MSG_CMSG_COMPAT)
+ return -EINVAL;
+
+ return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
}
+#ifdef CONFIG_COMPAT_32BIT_TIME
+SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
+ unsigned int, vlen, unsigned int, flags,
+ struct old_timespec32 __user *, timeout)
+{
+ if (flags & MSG_CMSG_COMPAT)
+ return -EINVAL;
+
+ return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
+}
+#endif
+
#ifdef __ARCH_WANT_SYS_SOCKETCALL
/* Argument list sizes for sys_socketcall */
#define AL(x) ((x) * sizeof(unsigned long))
@@ -2602,8 +2913,15 @@
a[2], true);
break;
case SYS_RECVMMSG:
- err = do_sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2],
- a[3], (struct timespec __user *)a[4]);
+ if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME))
+ err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
+ a[2], a[3],
+ (struct __kernel_timespec __user *)a[4],
+ NULL);
+ else
+ err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
+ a[2], a[3], NULL,
+ (struct old_timespec32 __user *)a[4]);
break;
case SYS_ACCEPT4:
err = __sys_accept4(a0, (struct sockaddr __user *)a1,
@@ -2744,40 +3062,6 @@
#endif /* CONFIG_PROC_FS */
#ifdef CONFIG_COMPAT
-static int do_siocgstamp(struct net *net, struct socket *sock,
- unsigned int cmd, void __user *up)
-{
- mm_segment_t old_fs = get_fs();
- struct timeval ktv;
- int err;
-
- set_fs(KERNEL_DS);
- err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv,
- sizeof(struct compat_ifreq));
- set_fs(old_fs);
- if (!err)
- err = compat_put_timeval(&ktv, up);
-
- return err;
-}
-
-static int do_siocgstampns(struct net *net, struct socket *sock,
- unsigned int cmd, void __user *up)
-{
- mm_segment_t old_fs = get_fs();
- struct timespec kts;
- int err;
-
- set_fs(KERNEL_DS);
- err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts,
- sizeof(struct compat_ifreq));
- set_fs(old_fs);
- if (!err)
- err = compat_put_timespec(&kts, up);
-
- return err;
-}
-
static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
{
struct compat_ifconf ifc32;
@@ -2966,6 +3250,54 @@
return dev_ioctl(net, cmd, &ifreq, NULL);
}
+static int compat_ifreq_ioctl(struct net *net, struct socket *sock,
+ unsigned int cmd,
+ struct compat_ifreq __user *uifr32)
+{
+ struct ifreq __user *uifr;
+ int err;
+
+ /* Handle the fact that while struct ifreq has the same *layout* on
+ * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
+ * which are handled elsewhere, it still has different *size* due to
+ * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
+ * resulting in struct ifreq being 32 and 40 bytes respectively).
+ * As a result, if the struct happens to be at the end of a page and
+ * the next page isn't readable/writable, we get a fault. To prevent
+ * that, copy back and forth to the full size.
+ */
+
+ uifr = compat_alloc_user_space(sizeof(*uifr));
+ if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
+ return -EFAULT;
+
+ err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
+
+ if (!err) {
+ switch (cmd) {
+ case SIOCGIFFLAGS:
+ case SIOCGIFMETRIC:
+ case SIOCGIFMTU:
+ case SIOCGIFMEM:
+ case SIOCGIFHWADDR:
+ case SIOCGIFINDEX:
+ case SIOCGIFADDR:
+ case SIOCGIFBRDADDR:
+ case SIOCGIFDSTADDR:
+ case SIOCGIFNETMASK:
+ case SIOCGIFPFLAGS:
+ case SIOCGIFTXQLEN:
+ case SIOCGMIIPHY:
+ case SIOCGMIIREG:
+ case SIOCGIFNAME:
+ if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
+ err = -EFAULT;
+ break;
+ }
+ }
+ return err;
+}
+
static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
struct compat_ifreq __user *uifr32)
{
@@ -3081,8 +3413,7 @@
}
set_fs(KERNEL_DS);
- ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r,
- sizeof(struct compat_ifreq));
+ ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
set_fs(old_fs);
out:
@@ -3130,10 +3461,13 @@
case SIOCADDRT:
case SIOCDELRT:
return routing_ioctl(net, sock, cmd, argp);
- case SIOCGSTAMP:
- return do_siocgstamp(net, sock, cmd, argp);
- case SIOCGSTAMPNS:
- return do_siocgstampns(net, sock, cmd, argp);
+ case SIOCGSTAMP_OLD:
+ case SIOCGSTAMPNS_OLD:
+ if (!sock->ops->gettstamp)
+ return -ENOIOCTLCMD;
+ return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
+ !COMPAT_USE_64BIT_TIME);
+
case SIOCBONDSLAVEINFOQUERY:
case SIOCBONDINFOQUERY:
case SIOCSHWTSTAMP:
@@ -3151,6 +3485,8 @@
case SIOCADDDLCI:
case SIOCDELDLCI:
case SIOCGSKNS:
+ case SIOCGSTAMP_NEW:
+ case SIOCGSTAMPNS_NEW:
return sock_ioctl(file, cmd, arg);
case SIOCGIFFLAGS:
@@ -3182,21 +3518,22 @@
case SIOCSIFTXQLEN:
case SIOCBRADDIF:
case SIOCBRDELIF:
+ case SIOCGIFNAME:
case SIOCSIFNAME:
case SIOCGMIIPHY:
case SIOCGMIIREG:
case SIOCSMIIREG:
- case SIOCSARP:
- case SIOCGARP:
- case SIOCDARP:
- case SIOCATMARK:
case SIOCBONDENSLAVE:
case SIOCBONDRELEASE:
case SIOCBONDSETHWADDR:
case SIOCBONDCHANGEACTIVE:
- case SIOCGIFNAME:
- return sock_do_ioctl(net, sock, cmd, arg,
- sizeof(struct compat_ifreq));
+ return compat_ifreq_ioctl(net, sock, cmd, argp);
+
+ case SIOCSARP:
+ case SIOCGARP:
+ case SIOCDARP:
+ case SIOCATMARK:
+ return sock_do_ioctl(net, sock, cmd, arg);
}
return -ENOIOCTLCMD;
@@ -3227,18 +3564,46 @@
}
#endif
+/**
+ * kernel_bind - bind an address to a socket (kernel space)
+ * @sock: socket
+ * @addr: address
+ * @addrlen: length of address
+ *
+ * Returns 0 or an error.
+ */
+
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
return sock->ops->bind(sock, addr, addrlen);
}
EXPORT_SYMBOL(kernel_bind);
+/**
+ * kernel_listen - move socket to listening state (kernel space)
+ * @sock: socket
+ * @backlog: pending connections queue size
+ *
+ * Returns 0 or an error.
+ */
+
int kernel_listen(struct socket *sock, int backlog)
{
return sock->ops->listen(sock, backlog);
}
EXPORT_SYMBOL(kernel_listen);
+/**
+ * kernel_accept - accept a connection (kernel space)
+ * @sock: listening socket
+ * @newsock: new connected socket
+ * @flags: flags
+ *
+ * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
+ * If it fails, @newsock is guaranteed to be %NULL.
+ * Returns 0 or an error.
+ */
+
int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
{
struct sock *sk = sock->sk;
@@ -3264,6 +3629,19 @@
}
EXPORT_SYMBOL(kernel_accept);
+/**
+ * kernel_connect - connect a socket (kernel space)
+ * @sock: socket
+ * @addr: address
+ * @addrlen: address length
+ * @flags: flags (O_NONBLOCK, ...)
+ *
+ * For datagram sockets, @addr is the addres to which datagrams are sent
+ * by default, and the only address from which datagrams are received.
+ * For stream sockets, attempts to connect to @addr.
+ * Returns 0 or an error code.
+ */
+
int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
int flags)
{
@@ -3271,18 +3649,48 @@
}
EXPORT_SYMBOL(kernel_connect);
+/**
+ * kernel_getsockname - get the address which the socket is bound (kernel space)
+ * @sock: socket
+ * @addr: address holder
+ *
+ * Fills the @addr pointer with the address which the socket is bound.
+ * Returns 0 or an error code.
+ */
+
int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
{
return sock->ops->getname(sock, addr, 0);
}
EXPORT_SYMBOL(kernel_getsockname);
+/**
+ * kernel_peername - get the address which the socket is connected (kernel space)
+ * @sock: socket
+ * @addr: address holder
+ *
+ * Fills the @addr pointer with the address which the socket is connected.
+ * Returns 0 or an error code.
+ */
+
int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
{
return sock->ops->getname(sock, addr, 1);
}
EXPORT_SYMBOL(kernel_getpeername);
+/**
+ * kernel_getsockopt - get a socket option (kernel space)
+ * @sock: socket
+ * @level: API level (SOL_SOCKET, ...)
+ * @optname: option tag
+ * @optval: option value
+ * @optlen: option length
+ *
+ * Assigns the option length to @optlen.
+ * Returns 0 or an error.
+ */
+
int kernel_getsockopt(struct socket *sock, int level, int optname,
char *optval, int *optlen)
{
@@ -3305,6 +3713,17 @@
}
EXPORT_SYMBOL(kernel_getsockopt);
+/**
+ * kernel_setsockopt - set a socket option (kernel space)
+ * @sock: socket
+ * @level: API level (SOL_SOCKET, ...)
+ * @optname: option tag
+ * @optval: option value
+ * @optlen: option length
+ *
+ * Returns 0 or an error.
+ */
+
int kernel_setsockopt(struct socket *sock, int level, int optname,
char *optval, unsigned int optlen)
{
@@ -3325,6 +3744,17 @@
}
EXPORT_SYMBOL(kernel_setsockopt);
+/**
+ * kernel_sendpage - send a &page through a socket (kernel space)
+ * @sock: socket
+ * @page: page
+ * @offset: page offset
+ * @size: total size in bytes
+ * @flags: flags (MSG_DONTWAIT, ...)
+ *
+ * Returns the total amount sent in bytes or an error.
+ */
+
int kernel_sendpage(struct socket *sock, struct page *page, int offset,
size_t size, int flags)
{
@@ -3335,6 +3765,18 @@
}
EXPORT_SYMBOL(kernel_sendpage);
+/**
+ * kernel_sendpage_locked - send a &page through the locked sock (kernel space)
+ * @sk: sock
+ * @page: page
+ * @offset: page offset
+ * @size: total size in bytes
+ * @flags: flags (MSG_DONTWAIT, ...)
+ *
+ * Returns the total amount sent in bytes or an error.
+ * Caller must hold @sk.
+ */
+
int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
size_t size, int flags)
{
@@ -3348,17 +3790,30 @@
}
EXPORT_SYMBOL(kernel_sendpage_locked);
+/**
+ * kernel_shutdown - shut down part of a full-duplex connection (kernel space)
+ * @sock: socket
+ * @how: connection part
+ *
+ * Returns 0 or an error.
+ */
+
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
{
return sock->ops->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);
-/* This routine returns the IP overhead imposed by a socket i.e.
- * the length of the underlying IP header, depending on whether
- * this is an IPv4 or IPv6 socket and the length from IP options turned
- * on at the socket. Assumes that the caller has a lock on the socket.
+/**
+ * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
+ * @sk: socket
+ *
+ * This routine returns the IP overhead imposed by a socket i.e.
+ * the length of the underlying IP header, depending on whether
+ * this is an IPv4 or IPv6 socket and the length from IP options turned
+ * on at the socket. Assumes that the caller has a lock on the socket.
*/
+
u32 kernel_sock_ip_overhead(struct sock *sk)
{
struct inet_sock *inet;