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skbuff: carry external ubuf_info in msghdr

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Make possible for network in-kernel callers like io_uring to pass in a
custom ubuf_info by setting it in a new field of struct msghdr.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pavel Begunkov
2022-07-12 21:52:29 +01:00
committed by Jakub Kicinski
parent 2e07a521e1
commit 7c701d92b2
3 changed files with 4 additions and 0 deletions
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2
net/socket.c
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@@ -2106,6 +2106,7 @@ int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_namelen = 0;
msg.msg_ubuf = NULL;
if (addr) {
err = move_addr_to_kernel(addr, addr_len, &address);
if (err < 0)
@@ -2405,6 +2406,7 @@ int __copy_msghdr_from_user(struct msghdr *kmsg,
return -EMSGSIZE;
kmsg->msg_iocb = NULL;
kmsg->msg_ubuf = NULL;
*uiov = msg.msg_iov;
*nsegs = msg.msg_iovlen;
return 0;