[PATCH net-next 2/4] net: implement sock_mmap_hook()
From: Eric Dumazet <edumazet@google.com>
Date: 2018-04-20 15:56:44
Also in:
lkml
Subsystem:
networking [general], networking [sockets], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Kuniyuki Iwashima, Willem de Bruijn, Linus Torvalds
sock_mmap_hook() is the mmap_hook handler provided for socket_file_ops Following patch will provide tcp_mmap_hook() for TCP protocol. Signed-off-by: Eric Dumazet <edumazet@google.com> --- include/linux/net.h | 1 + net/socket.c | 9 +++++++++ 2 files changed, 10 insertions(+)
diff --git a/include/linux/net.h b/include/linux/net.h
index 6554d3ba4396b3df49acac934ad16eeb71a695f4..5192bf502b11e42c3d9eb342ce67361916149bfa 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h@@ -181,6 +181,7 @@ struct proto_ops { size_t total_len, int flags); int (*mmap) (struct file *file, struct socket *sock, struct vm_area_struct * vma); + int (*mmap_hook) (struct socket *sock, enum mmap_hook); ssize_t (*sendpage) (struct socket *sock, struct page *page, int offset, size_t size, int flags); ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
diff --git a/net/socket.c b/net/socket.c
index f10f1d947c78c193b49379b0ec641d81367fb4cf..75a5c2ebe57e0621dae17c6c9e1a796ee818b107 100644
--- a/net/socket.c
+++ b/net/socket.c@@ -131,6 +131,14 @@ static ssize_t sock_splice_read(struct file *file, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags); +static int sock_mmap_hook(struct file *file, enum mmap_hook mode) +{ + struct socket *sock = file->private_data; + + if (!sock->ops->mmap_hook) + return 0; + return sock->ops->mmap_hook(sock, mode); +} /* * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear * in the operation structures but are done directly via the socketcall() multiplexor.
@@ -147,6 +155,7 @@ static const struct file_operations socket_file_ops = { .compat_ioctl = compat_sock_ioctl, #endif .mmap = sock_mmap, + .mmap_hook = sock_mmap_hook, .release = sock_close, .fasync = sock_fasync, .sendpage = sock_sendpage,
--
2.17.0.484.g0c8726318c-goog