[PATCH net-next v4 06/27] net: Allow custom iter handler in msghdr

Pavel Begunkov
2022-07-07T11:52:05Z

From: David Ahern <dsahern@kernel.org>

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>
---
include/linux/skbuff.h | 7 ++++---
include/linux/socket.h | 4 ++++
net/core/datagram.c | 14 ++++++++++----
net/core/skbuff.c | 2 +-
4 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 8e12b3b9ad6c..a8a2dd4cfdfd 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1776,13 +1776,14 @@ void msg_zerocopy_put_abort(struct ubuf_info *uarg, bool have_uref);
void msg_zerocopy_callback(struct sk_buff *skb, struct ubuf_info *uarg,
bool success);

-int __zerocopy_sg_from_iter(struct sock *sk, struct sk_buff *skb,
- struct iov_iter *from, size_t length);
+int __zerocopy_sg_from_iter(struct msghdr *msg, struct sock *sk,
+ struct sk_buff *skb, struct iov_iter *from,
+ size_t length);

static inline int skb_zerocopy_iter_dgram(struct sk_buff *skb,
struct msghdr *msg, int len)
{
- return __zerocopy_sg_from_iter(skb->sk, skb, &msg->msg_iter, len);
+ return __zerocopy_sg_from_iter(msg, skb->sk, skb, &msg->msg_iter, len);
}

int skb_zerocopy_iter_stream(struct sock *sk, struct sk_buff *skb,
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 7bac9fc1cee0..3c11ef18a9cf 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -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 {
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 50f4faeea76c..b3c05efd659f 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -613,10 +613,16 @@ int skb_copy_datagram_from_iter(struct sk_buff *skb, int offset,
}
EXPORT_SYMBOL(skb_copy_datagram_from_iter);

-int __zerocopy_sg_from_iter(struct sock *sk, struct sk_buff *skb,
- struct iov_iter *from, size_t length)
+int __zerocopy_sg_from_iter(struct msghdr *msg, struct sock *sk,
+ struct sk_buff *skb, struct iov_iter *from,
+ size_t length)
{
- int frag = skb_shinfo(skb)->nr_frags;
+ int frag;
+
+ if (msg && msg->sg_from_iter && msg->msg_ubuf == skb_zcopy(skb))
+ return msg->sg_from_iter(sk, skb, from, length);
+
+ frag = skb_shinfo(skb)->nr_frags;

while (length && iov_iter_count(from)) {
struct page *pages[MAX_SKB_FRAGS];
@@ -702,7 +708,7 @@ int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *from)
if (skb_copy_datagram_from_iter(skb, 0, from, copy))
return -EFAULT;

- return __zerocopy_sg_from_iter(NULL, skb, from, ~0U);
+ return __zerocopy_sg_from_iter(NULL, NULL, skb, from, ~0U);
}
EXPORT_SYMBOL(zerocopy_sg_from_iter);

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index fc22b3d32052..f5a3ebbc1f7e 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1358,7 +1358,7 @@ int skb_zerocopy_iter_stream(struct sock *sk, struct sk_buff *skb,
if (orig_uarg && uarg != orig_uarg)
return -EEXIST;

- err = __zerocopy_sg_from_iter(sk, skb, &msg->msg_iter, len);
+ err = __zerocopy_sg_from_iter(msg, sk, skb, &msg->msg_iter, len);
if (err == -EFAULT || (err == -EMSGSIZE && skb->len == orig_len)) {
struct sock *save_sk = skb->sk;

--
2.36.1