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net: Allow custom iter handler in msghdr

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Add support for custom iov_iter handling to msghdr. The idea is that
in-kernel subsystems want control over how an SG is split.

Signed-off-by: David Ahern <dsahern@kernel.org>
[pavel: move callback into msghdr]
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
David Ahern
2022-07-12 21:52:30 +01:00
committed by Jakub Kicinski
parent 7c701d92b2
commit ebe73a284f
4 changed files with 19 additions and 8 deletions
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4
include/linux/socket.h
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@@ -14,6 +14,8 @@ struct file;
struct pid;
struct cred;
struct socket;
struct sock;
struct sk_buff;
#define __sockaddr_check_size(size) \
BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))
@@ -70,6 +72,8 @@ struct msghdr {
__kernel_size_t msg_controllen; /* ancillary data buffer length */
struct kiocb *msg_iocb; /* ptr to iocb for async requests */
struct ubuf_info *msg_ubuf;
int (*sg_from_iter)(struct sock *sk, struct sk_buff *skb,
struct iov_iter *from, size_t length);
};
struct user_msghdr {