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-rw-r--r--net/socket.c167
1 files changed, 110 insertions, 57 deletions
diff --git a/net/socket.c b/net/socket.c
index 2b0e54b2405c..848116d06b51 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -136,9 +136,10 @@ static void sock_splice_eof(struct file *file);
static void sock_show_fdinfo(struct seq_file *m, struct file *f)
{
struct socket *sock = f->private_data;
+ const struct proto_ops *ops = READ_ONCE(sock->ops);
- if (sock->ops->show_fdinfo)
- sock->ops->show_fdinfo(m, sock);
+ if (ops->show_fdinfo)
+ ops->show_fdinfo(m, sock);
}
#else
#define sock_show_fdinfo NULL
@@ -646,12 +647,14 @@ EXPORT_SYMBOL(sock_alloc);
static void __sock_release(struct socket *sock, struct inode *inode)
{
- if (sock->ops) {
- struct module *owner = sock->ops->owner;
+ const struct proto_ops *ops = READ_ONCE(sock->ops);
+
+ if (ops) {
+ struct module *owner = ops->owner;
if (inode)
inode_lock(inode);
- sock->ops->release(sock);
+ ops->release(sock);
sock->sk = NULL;
if (inode)
inode_unlock(inode);
@@ -722,7 +725,7 @@ static noinline void call_trace_sock_send_length(struct sock *sk, int ret,
static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
{
- int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg,
+ int ret = INDIRECT_CALL_INET(READ_ONCE(sock->ops)->sendmsg, inet6_sendmsg,
inet_sendmsg, sock, msg,
msg_data_left(msg));
BUG_ON(ret == -EIOCBQUEUED);
@@ -786,13 +789,14 @@ int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
struct kvec *vec, size_t num, size_t size)
{
struct socket *sock = sk->sk_socket;
+ const struct proto_ops *ops = READ_ONCE(sock->ops);
- if (!sock->ops->sendmsg_locked)
+ if (!ops->sendmsg_locked)
return sock_no_sendmsg_locked(sk, msg, size);
iov_iter_kvec(&msg->msg_iter, ITER_SOURCE, vec, num, size);
- return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
+ return ops->sendmsg_locked(sk, msg, msg_data_left(msg));
}
EXPORT_SYMBOL(kernel_sendmsg_locked);
@@ -1017,7 +1021,8 @@ static noinline void call_trace_sock_recv_length(struct sock *sk, int ret, int f
static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
int flags)
{
- int ret = INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg,
+ int ret = INDIRECT_CALL_INET(READ_ONCE(sock->ops)->recvmsg,
+ inet6_recvmsg,
inet_recvmsg, sock, msg,
msg_data_left(msg), flags);
if (trace_sock_recv_length_enabled())
@@ -1072,19 +1077,23 @@ static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
unsigned int flags)
{
struct socket *sock = file->private_data;
+ const struct proto_ops *ops;
- if (unlikely(!sock->ops->splice_read))
+ ops = READ_ONCE(sock->ops);
+ if (unlikely(!ops->splice_read))
return copy_splice_read(file, ppos, pipe, len, flags);
- return sock->ops->splice_read(sock, ppos, pipe, len, flags);
+ return ops->splice_read(sock, ppos, pipe, len, flags);
}
static void sock_splice_eof(struct file *file)
{
struct socket *sock = file->private_data;
+ const struct proto_ops *ops;
- if (sock->ops->splice_eof)
- sock->ops->splice_eof(sock);
+ ops = READ_ONCE(sock->ops);
+ if (ops->splice_eof)
+ ops->splice_eof(sock);
}
static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
@@ -1181,13 +1190,14 @@ EXPORT_SYMBOL(vlan_ioctl_set);
static long sock_do_ioctl(struct net *net, struct socket *sock,
unsigned int cmd, unsigned long arg)
{
+ const struct proto_ops *ops = READ_ONCE(sock->ops);
struct ifreq ifr;
bool need_copyout;
int err;
void __user *argp = (void __user *)arg;
void __user *data;
- err = sock->ops->ioctl(sock, cmd, arg);
+ err = ops->ioctl(sock, cmd, arg);
/*
* If this ioctl is unknown try to hand it down
@@ -1216,6 +1226,7 @@ static long sock_do_ioctl(struct net *net, struct socket *sock,
static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
+ const struct proto_ops *ops;
struct socket *sock;
struct sock *sk;
void __user *argp = (void __user *)arg;
@@ -1223,6 +1234,7 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
struct net *net;
sock = file->private_data;
+ ops = READ_ONCE(sock->ops);
sk = sock->sk;
net = sock_net(sk);
if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
@@ -1280,23 +1292,23 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
break;
case SIOCGSTAMP_OLD:
case SIOCGSTAMPNS_OLD:
- if (!sock->ops->gettstamp) {
+ if (!ops->gettstamp) {
err = -ENOIOCTLCMD;
break;
}
- err = sock->ops->gettstamp(sock, argp,
- cmd == SIOCGSTAMP_OLD,
- !IS_ENABLED(CONFIG_64BIT));
+ err = ops->gettstamp(sock, argp,
+ cmd == SIOCGSTAMP_OLD,
+ !IS_ENABLED(CONFIG_64BIT));
break;
case SIOCGSTAMP_NEW:
case SIOCGSTAMPNS_NEW:
- if (!sock->ops->gettstamp) {
+ if (!ops->gettstamp) {
err = -ENOIOCTLCMD;
break;
}
- err = sock->ops->gettstamp(sock, argp,
- cmd == SIOCGSTAMP_NEW,
- false);
+ err = ops->gettstamp(sock, argp,
+ cmd == SIOCGSTAMP_NEW,
+ false);
break;
case SIOCGIFCONF:
@@ -1357,9 +1369,10 @@ EXPORT_SYMBOL(sock_create_lite);
static __poll_t sock_poll(struct file *file, poll_table *wait)
{
struct socket *sock = file->private_data;
+ const struct proto_ops *ops = READ_ONCE(sock->ops);
__poll_t events = poll_requested_events(wait), flag = 0;
- if (!sock->ops->poll)
+ if (!ops->poll)
return 0;
if (sk_can_busy_loop(sock->sk)) {
@@ -1371,14 +1384,14 @@ static __poll_t sock_poll(struct file *file, poll_table *wait)
flag = POLL_BUSY_LOOP;
}
- return sock->ops->poll(file, sock, wait) | flag;
+ return ops->poll(file, sock, wait) | flag;
}
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
{
struct socket *sock = file->private_data;
- return sock->ops->mmap(file, sock, vma);
+ return READ_ONCE(sock->ops)->mmap(file, sock, vma);
}
static int sock_close(struct inode *inode, struct file *filp)
@@ -1644,12 +1657,36 @@ struct file *__sys_socket_file(int family, int type, int protocol)
return sock_alloc_file(sock, flags, NULL);
}
+/* A hook for bpf progs to attach to and update socket protocol.
+ *
+ * A static noinline declaration here could cause the compiler to
+ * optimize away the function. A global noinline declaration will
+ * keep the definition, but may optimize away the callsite.
+ * Therefore, __weak is needed to ensure that the call is still
+ * emitted, by telling the compiler that we don't know what the
+ * function might eventually be.
+ *
+ * __diag_* below are needed to dismiss the missing prototype warning.
+ */
+
+__diag_push();
+__diag_ignore_all("-Wmissing-prototypes",
+ "A fmod_ret entry point for BPF programs");
+
+__weak noinline int update_socket_protocol(int family, int type, int protocol)
+{
+ return protocol;
+}
+
+__diag_pop();
+
int __sys_socket(int family, int type, int protocol)
{
struct socket *sock;
int flags;
- sock = __sys_socket_create(family, type, protocol);
+ sock = __sys_socket_create(family, type,
+ update_socket_protocol(family, type, protocol));
if (IS_ERR(sock))
return PTR_ERR(sock);
@@ -1728,7 +1765,7 @@ int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
goto out;
}
- err = sock1->ops->socketpair(sock1, sock2);
+ err = READ_ONCE(sock1->ops)->socketpair(sock1, sock2);
if (unlikely(err < 0)) {
sock_release(sock2);
sock_release(sock1);
@@ -1789,7 +1826,7 @@ int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
(struct sockaddr *)&address,
addrlen);
if (!err)
- err = sock->ops->bind(sock,
+ err = READ_ONCE(sock->ops)->bind(sock,
(struct sockaddr *)
&address, addrlen);
}
@@ -1823,7 +1860,7 @@ int __sys_listen(int fd, int backlog)
err = security_socket_listen(sock, backlog);
if (!err)
- err = sock->ops->listen(sock, backlog);
+ err = READ_ONCE(sock->ops)->listen(sock, backlog);
fput_light(sock->file, fput_needed);
}
@@ -1843,6 +1880,7 @@ struct file *do_accept(struct file *file, unsigned file_flags,
struct file *newfile;
int err, len;
struct sockaddr_storage address;
+ const struct proto_ops *ops;
sock = sock_from_file(file);
if (!sock)
@@ -1851,15 +1889,16 @@ struct file *do_accept(struct file *file, unsigned file_flags,
newsock = sock_alloc();
if (!newsock)
return ERR_PTR(-ENFILE);
+ ops = READ_ONCE(sock->ops);
newsock->type = sock->type;
- newsock->ops = sock->ops;
+ newsock->ops = ops;
/*
* We don't need try_module_get here, as the listening socket (sock)
* has the protocol module (sock->ops->owner) held.
*/
- __module_get(newsock->ops->owner);
+ __module_get(ops->owner);
newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
if (IS_ERR(newfile))
@@ -1869,14 +1908,13 @@ struct file *do_accept(struct file *file, unsigned file_flags,
if (err)
goto out_fd;
- err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags,
+ err = ops->accept(sock, newsock, sock->file->f_flags | file_flags,
false);
if (err < 0)
goto out_fd;
if (upeer_sockaddr) {
- len = newsock->ops->getname(newsock,
- (struct sockaddr *)&address, 2);
+ len = ops->getname(newsock, (struct sockaddr *)&address, 2);
if (len < 0) {
err = -ECONNABORTED;
goto out_fd;
@@ -1989,8 +2027,8 @@ int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
if (err)
goto out;
- err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
- sock->file->f_flags | file_flags);
+ err = READ_ONCE(sock->ops)->connect(sock, (struct sockaddr *)address,
+ addrlen, sock->file->f_flags | file_flags);
out:
return err;
}
@@ -2039,7 +2077,7 @@ int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
if (err)
goto out_put;
- err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
+ err = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, 0);
if (err < 0)
goto out_put;
/* "err" is actually length in this case */
@@ -2071,13 +2109,15 @@ int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock != NULL) {
+ const struct proto_ops *ops = READ_ONCE(sock->ops);
+
err = security_socket_getpeername(sock);
if (err) {
fput_light(sock->file, fput_needed);
return err;
}
- err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
+ err = ops->getname(sock, (struct sockaddr *)&address, 1);
if (err >= 0)
/* "err" is actually length in this case */
err = move_addr_to_user(&address, err, usockaddr,
@@ -2227,6 +2267,7 @@ int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
int optlen)
{
sockptr_t optval = USER_SOCKPTR(user_optval);
+ const struct proto_ops *ops;
char *kernel_optval = NULL;
int err, fput_needed;
struct socket *sock;
@@ -2255,12 +2296,13 @@ int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
if (kernel_optval)
optval = KERNEL_SOCKPTR(kernel_optval);
+ ops = READ_ONCE(sock->ops);
if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
err = sock_setsockopt(sock, level, optname, optval, optlen);
- else if (unlikely(!sock->ops->setsockopt))
+ else if (unlikely(!ops->setsockopt))
err = -EOPNOTSUPP;
else
- err = sock->ops->setsockopt(sock, level, optname, optval,
+ err = ops->setsockopt(sock, level, optname, optval,
optlen);
kfree(kernel_optval);
out_put:
@@ -2285,6 +2327,7 @@ int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
int __user *optlen)
{
int max_optlen __maybe_unused;
+ const struct proto_ops *ops;
int err, fput_needed;
struct socket *sock;
@@ -2299,12 +2342,13 @@ int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
if (!in_compat_syscall())
max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
+ ops = READ_ONCE(sock->ops);
if (level == SOL_SOCKET)
err = sock_getsockopt(sock, level, optname, optval, optlen);
- else if (unlikely(!sock->ops->getsockopt))
+ else if (unlikely(!ops->getsockopt))
err = -EOPNOTSUPP;
else
- err = sock->ops->getsockopt(sock, level, optname, optval,
+ err = ops->getsockopt(sock, level, optname, optval,
optlen);
if (!in_compat_syscall())
@@ -2332,7 +2376,7 @@ int __sys_shutdown_sock(struct socket *sock, int how)
err = security_socket_shutdown(sock, how);
if (!err)
- err = sock->ops->shutdown(sock, how);
+ err = READ_ONCE(sock->ops)->shutdown(sock, how);
return err;
}
@@ -3324,6 +3368,7 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
void __user *argp = compat_ptr(arg);
struct sock *sk = sock->sk;
struct net *net = sock_net(sk);
+ const struct proto_ops *ops;
if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
return sock_ioctl(file, cmd, (unsigned long)argp);
@@ -3333,10 +3378,11 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
return compat_siocwandev(net, argp);
case SIOCGSTAMP_OLD:
case SIOCGSTAMPNS_OLD:
- if (!sock->ops->gettstamp)
+ ops = READ_ONCE(sock->ops);
+ if (!ops->gettstamp)
return -ENOIOCTLCMD;
- return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
- !COMPAT_USE_64BIT_TIME);
+ return ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
+ !COMPAT_USE_64BIT_TIME);
case SIOCETHTOOL:
case SIOCBONDSLAVEINFOQUERY:
@@ -3417,6 +3463,7 @@ static long compat_sock_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct socket *sock = file->private_data;
+ const struct proto_ops *ops = READ_ONCE(sock->ops);
int ret = -ENOIOCTLCMD;
struct sock *sk;
struct net *net;
@@ -3424,8 +3471,8 @@ static long compat_sock_ioctl(struct file *file, unsigned int cmd,
sk = sock->sk;
net = sock_net(sk);
- if (sock->ops->compat_ioctl)
- ret = sock->ops->compat_ioctl(sock, cmd, arg);
+ if (ops->compat_ioctl)
+ ret = ops->compat_ioctl(sock, cmd, arg);
if (ret == -ENOIOCTLCMD &&
(cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
@@ -3449,7 +3496,7 @@ static long compat_sock_ioctl(struct file *file, unsigned int cmd,
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
- return sock->ops->bind(sock, addr, addrlen);
+ return READ_ONCE(sock->ops)->bind(sock, addr, addrlen);
}
EXPORT_SYMBOL(kernel_bind);
@@ -3463,7 +3510,7 @@ EXPORT_SYMBOL(kernel_bind);
int kernel_listen(struct socket *sock, int backlog)
{
- return sock->ops->listen(sock, backlog);
+ return READ_ONCE(sock->ops)->listen(sock, backlog);
}
EXPORT_SYMBOL(kernel_listen);
@@ -3481,6 +3528,7 @@ EXPORT_SYMBOL(kernel_listen);
int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
{
struct sock *sk = sock->sk;
+ const struct proto_ops *ops = READ_ONCE(sock->ops);
int err;
err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
@@ -3488,15 +3536,15 @@ int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
if (err < 0)
goto done;
- err = sock->ops->accept(sock, *newsock, flags, true);
+ err = ops->accept(sock, *newsock, flags, true);
if (err < 0) {
sock_release(*newsock);
*newsock = NULL;
goto done;
}
- (*newsock)->ops = sock->ops;
- __module_get((*newsock)->ops->owner);
+ (*newsock)->ops = ops;
+ __module_get(ops->owner);
done:
return err;
@@ -3519,7 +3567,12 @@ EXPORT_SYMBOL(kernel_accept);
int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
int flags)
{
- return sock->ops->connect(sock, addr, addrlen, flags);
+ struct sockaddr_storage address;
+
+ memcpy(&address, addr, addrlen);
+
+ return READ_ONCE(sock->ops)->connect(sock, (struct sockaddr *)&address,
+ addrlen, flags);
}
EXPORT_SYMBOL(kernel_connect);
@@ -3534,7 +3587,7 @@ EXPORT_SYMBOL(kernel_connect);
int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
{
- return sock->ops->getname(sock, addr, 0);
+ return READ_ONCE(sock->ops)->getname(sock, addr, 0);
}
EXPORT_SYMBOL(kernel_getsockname);
@@ -3549,7 +3602,7 @@ EXPORT_SYMBOL(kernel_getsockname);
int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
{
- return sock->ops->getname(sock, addr, 1);
+ return READ_ONCE(sock->ops)->getname(sock, addr, 1);
}
EXPORT_SYMBOL(kernel_getpeername);
@@ -3563,7 +3616,7 @@ EXPORT_SYMBOL(kernel_getpeername);
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
{
- return sock->ops->shutdown(sock, how);
+ return READ_ONCE(sock->ops)->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 18:55:38 +0100