diff options
| author | Harout Hedeshian <harouth@codeaurora.org> | 2014-03-04 07:31:47 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-22 11:09:38 -0700 |
| commit | d675b4b3d4f238eab48e1815bbbd1d05dee0dede (patch) | |
| tree | 18969447e8a792b68cc82a26627d8c7bfc84d338 /net/socket.c | |
| parent | 1afe1dec58534a2efd806e79ef1915d711d19a10 (diff) | |
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>
[subashab@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Diffstat (limited to 'net/socket.c')
| -rw-r--r-- | net/socket.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/net/socket.c b/net/socket.c index d730ef9dfbf0..7a6b5f2e4eba 100644 --- a/net/socket.c +++ b/net/socket.c @@ -115,6 +115,9 @@ unsigned int sysctl_net_busy_poll __read_mostly; static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); + +static BLOCKING_NOTIFIER_HEAD(sockev_notifier_list); + static int sock_mmap(struct file *file, struct vm_area_struct *vma); static int sock_close(struct inode *inode, struct file *file); @@ -169,6 +172,14 @@ 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. @@ -1234,6 +1245,9 @@ 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; @@ -1379,6 +1393,8 @@ 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; } @@ -1406,6 +1422,8 @@ 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; } @@ -1492,7 +1510,8 @@ 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: @@ -1542,6 +1561,8 @@ 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: @@ -1799,6 +1820,7 @@ 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); @@ -3294,3 +3316,15 @@ 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); |