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switch AF_PACKET and AF_UNIX to skb_copy_datagram_from_iter()

Browse source 
... and kill skb_copy_datagram_iovec()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-11-06 01:10:59 -05:00
parent 195e952d03
commit 8feb2fb2bb
4 changed files with 18 additions and 95 deletions
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3
include/linux/skbuff.h
View file

@ -2656,9 +2656,6 @@ static inline int skb_copy_and_csum_datagram_msg(struct sk_buff *skb, int hlen,
{
return skb_copy_and_csum_datagram_iovec(skb, hlen, msg->msg_iov);
}
int skb_copy_datagram_from_iovec(struct sk_buff *skb, int offset,
const struct iovec *from, int from_offset,
int len);
int skb_copy_datagram_from_iter(struct sk_buff *skb, int offset,
struct iov_iter *from, int len);
int skb_copy_datagram_iter(const struct sk_buff *from, int offset,

88
net/core/datagram.c
View file

@ -480,98 +480,14 @@ short_copy:
EXPORT_SYMBOL(skb_copy_datagram_iter);
/**
* skb_copy_datagram_from_iovec - Copy a datagram from an iovec.
* skb_copy_datagram_from_iter - Copy a datagram from an iov_iter.
* @skb: buffer to copy
* @offset: offset in the buffer to start copying to
* @from: io vector to copy to
* @from_offset: offset in the io vector to start copying from
* @from: the copy source
* @len: amount of data to copy to buffer from iovec
*
* Returns 0 or -EFAULT.
* Note: the iovec is not modified during the copy.
*/
int skb_copy_datagram_from_iovec(struct sk_buff *skb, int offset,
const struct iovec *from, int from_offset,
int len)
{
int start = skb_headlen(skb);
int i, copy = start - offset;
struct sk_buff *frag_iter;
/* Copy header. */
if (copy > 0) {
if (copy > len)
copy = len;
if (memcpy_fromiovecend(skb->data + offset, from, from_offset,
copy))
goto fault;
if ((len -= copy) == 0)
return 0;
offset += copy;
from_offset += copy;
}
/* Copy paged appendix. Hmm... why does this look so complicated? */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
WARN_ON(start > offset + len);
end = start + skb_frag_size(frag);
if ((copy = end - offset) > 0) {
int err;
u8 *vaddr;
struct page *page = skb_frag_page(frag);
if (copy > len)
copy = len;
vaddr = kmap(page);
err = memcpy_fromiovecend(vaddr + frag->page_offset +
offset - start,
from, from_offset, copy);
kunmap(page);
if (err)
goto fault;
if (!(len -= copy))
return 0;
offset += copy;
from_offset += copy;
}
start = end;
}
skb_walk_frags(skb, frag_iter) {
int end;
WARN_ON(start > offset + len);
end = start + frag_iter->len;
if ((copy = end - offset) > 0) {
if (copy > len)
copy = len;
if (skb_copy_datagram_from_iovec(frag_iter,
offset - start,
from,
from_offset,
copy))
goto fault;
if ((len -= copy) == 0)
return 0;
offset += copy;
from_offset += copy;
}
start = end;
}
if (!len)
return 0;
fault:
return -EFAULT;
}
EXPORT_SYMBOL(skb_copy_datagram_from_iovec);
int skb_copy_datagram_from_iter(struct sk_buff *skb, int offset,
struct iov_iter *from,
int len)

11
net/packet/af_packet.c
View file

@ -2408,6 +2408,10 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
unsigned short gso_type = 0;
int hlen, tlen;
int extra_len = 0;
struct iov_iter from;
ssize_t n;
iov_iter_init(&from, WRITE, msg->msg_iov, msg->msg_iovlen, len);
/*
* Get and verify the address.
@ -2446,8 +2450,9 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
len -= vnet_hdr_len;
err = memcpy_from_msg((void *)&vnet_hdr, msg, vnet_hdr_len);
if (err < 0)
err = -EFAULT;
n = copy_from_iter(&vnet_hdr, vnet_hdr_len, &from);
if (n != vnet_hdr_len)
goto out_unlock;
if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
@ -2517,7 +2522,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
}
/* Returns -EFAULT on error */
err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
err = skb_copy_datagram_from_iter(skb, offset, &from, len);
if (err)
goto out_free;

11
net/unix/af_unix.c
View file

@ -1459,6 +1459,9 @@ static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
struct scm_cookie tmp_scm;
int max_level;
int data_len = 0;
struct iov_iter from;
iov_iter_init(&from, WRITE, msg->msg_iov, msg->msg_iovlen, len);
if (NULL == siocb->scm)
siocb->scm = &tmp_scm;
@ -1516,7 +1519,7 @@ static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
skb_put(skb, len - data_len);
skb->data_len = data_len;
skb->len = len;
err = skb_copy_datagram_from_iovec(skb, 0, msg->msg_iov, 0, len);
err = skb_copy_datagram_from_iter(skb, 0, &from, len);
if (err)
goto out_free;
@ -1638,6 +1641,9 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
bool fds_sent = false;
int max_level;
int data_len;
struct iov_iter from;
iov_iter_init(&from, WRITE, msg->msg_iov, msg->msg_iovlen, len);
if (NULL == siocb->scm)
siocb->scm = &tmp_scm;
@ -1694,8 +1700,7 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
skb_put(skb, size - data_len);
skb->data_len = data_len;
skb->len = size;
err = skb_copy_datagram_from_iovec(skb, 0, msg->msg_iov,
sent, size);
err = skb_copy_datagram_from_iter(skb, 0, &from, size);
if (err) {
kfree_skb(skb);
goto out_err;