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net: socket: Added notifier chains for socket administrative functions 

Allows other areas in the kernel to register notifier callbacks which
get invoked whenever something performs an administrative action on a
socket. This patch adds hooks in socket(), bind(), listen(), accept(),
shutdown().

CRs-Fixed:  626021
Change-Id: I4ae99cb2206d7c4eddba69757335c18d10143045
Signed-off-by: Harout Hedeshian <harouth@codeaurora.org>
This commit is contained in:
Harout Hedeshian 2014-03-04 07:31:47 -07:00
parent f24aee9af1
commit 5886b0b593
2 changed files with 45 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/net/sock.h
View File

@ -2261,4 +2261,15 @@ extern int sysctl_optmem_max;
extern __u32 sysctl_wmem_default;
extern __u32 sysctl_rmem_default;
/* SOCKEV Notifier Events */
#define SOCKEV_SOCKET 0x00
#define SOCKEV_BIND 0x01
#define SOCKEV_LISTEN 0x02
#define SOCKEV_ACCEPT 0x03
#define SOCKEV_CONNECT 0x04
#define SOCKEV_SHUTDOWN 0x05
int sockev_register_notify(struct notifier_block *nb);
int sockev_unregister_notify(struct notifier_block *nb);
#endif /* _SOCK_H */

35
net/socket.c
View File

@ -105,6 +105,8 @@
#include <linux/sockios.h>
#include <linux/atalk.h>
static BLOCKING_NOTIFIER_HEAD(sockev_notifier_list);
static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos);
@ -165,6 +167,14 @@ static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
static DEFINE_PER_CPU(int, sockets_in_use);
/*
* Socket Event framework helpers
*/
static void sockev_notify(unsigned long event, struct socket *sk)
{
blocking_notifier_call_chain(&sockev_notifier_list, event, sk);
}
/**
* Support routines.
* Move socket addresses back and forth across the kernel/user
* divide and look after the messy bits.
@ -1382,6 +1392,9 @@ SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
if (retval < 0)
goto out;
if (retval == 0)
sockev_notify(SOCKEV_SOCKET, sock);
retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
if (retval < 0)
goto out_release;
@ -1514,6 +1527,8 @@ SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
&address, addrlen);
}
fput_light(sock->file, fput_needed);
if (!err)
sockev_notify(SOCKEV_BIND, sock);
}
return err;
}
@ -1541,6 +1556,8 @@ SYSCALL_DEFINE2(listen, int, fd, int, backlog)
err = sock->ops->listen(sock, backlog);
fput_light(sock->file, fput_needed);
if (!err)
sockev_notify(SOCKEV_LISTEN, sock);
}
return err;
}
@ -1627,7 +1644,8 @@ SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
fd_install(newfd, newfile);
err = newfd;
if (!err)
sockev_notify(SOCKEV_ACCEPT, sock);
out_put:
fput_light(sock->file, fput_needed);
out:
@ -1677,6 +1695,8 @@ SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
sock->file->f_flags);
if (!err)
sockev_notify(SOCKEV_CONNECT, sock);
out_put:
fput_light(sock->file, fput_needed);
out:
@ -1939,6 +1959,7 @@ SYSCALL_DEFINE2(shutdown, int, fd, int, how)
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock != NULL) {
sockev_notify(SOCKEV_SHUTDOWN, sock);
err = security_socket_shutdown(sock, how);
if (!err)
err = sock->ops->shutdown(sock, how);
@ -3477,3 +3498,15 @@ int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
return sock->ops->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);
int sockev_register_notify(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&sockev_notifier_list, nb);
}
EXPORT_SYMBOL(sockev_register_notify);
int sockev_unregister_notify(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&sockev_notifier_list, nb);
}
EXPORT_SYMBOL(sockev_unregister_notify);