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switch sctp_user_addto_chunk() and sctp_datamsg_from_user() to passing iov_iter 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-11-15 01:11:23 -05:00
parent 8feb2fb2bb
commit e0eb093e79
4 changed files with 19 additions and 17 deletions
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6
include/net/sctp/structs.h
View File

@ -531,7 +531,7 @@ struct sctp_datamsg {
struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,
struct sctp_sndrcvinfo *,
struct msghdr *, int len);
struct iov_iter *);
void sctp_datamsg_free(struct sctp_datamsg *);
void sctp_datamsg_put(struct sctp_datamsg *);
void sctp_chunk_fail(struct sctp_chunk *, int error);
@ -647,8 +647,8 @@ struct sctp_chunk {
void sctp_chunk_hold(struct sctp_chunk *);
void sctp_chunk_put(struct sctp_chunk *);
int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
struct iovec *data);
int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
struct iov_iter *from);
void sctp_chunk_free(struct sctp_chunk *);
void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data);
struct sctp_chunk *sctp_chunkify(struct sk_buff *,

9
net/sctp/chunk.c
View File

@ -164,7 +164,7 @@ static void sctp_datamsg_assign(struct sctp_datamsg *msg, struct sctp_chunk *chu
*/
struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
struct sctp_sndrcvinfo *sinfo,
struct msghdr *msgh, int msg_len)
struct iov_iter *from)
{
int max, whole, i, offset, over, err;
int len, first_len;
@ -172,6 +172,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
struct sctp_chunk *chunk;
struct sctp_datamsg *msg;
struct list_head *pos, *temp;
size_t msg_len = iov_iter_count(from);
__u8 frag;
msg = sctp_datamsg_new(GFP_KERNEL);
@ -279,12 +280,10 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
goto errout;
}
err = sctp_user_addto_chunk(chunk, offset, len, msgh->msg_iov);
err = sctp_user_addto_chunk(chunk, len, from);
if (err < 0)
goto errout_chunk_free;
offset += len;
/* Put the chunk->skb back into the form expected by send. */
__skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr
- (__u8 *)chunk->skb->data);
@ -317,7 +316,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
goto errout;
}
err = sctp_user_addto_chunk(chunk, offset, over, msgh->msg_iov);
err = sctp_user_addto_chunk(chunk, over, from);
/* Put the chunk->skb back into the form expected by send. */
__skb_pull(chunk->skb, (__u8 *)chunk->chunk_hdr

16
net/sctp/sm_make_chunk.c
View File

@ -1491,26 +1491,26 @@ static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
* chunk is not big enough.
* Returns a kernel err value.
*/
int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
struct iovec *data)
int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len,
struct iov_iter *from)
{
__u8 *target;
int err = 0;
void *target;
ssize_t copied;
/* Make room in chunk for data. */
target = skb_put(chunk->skb, len);
/* Copy data (whole iovec) into chunk */
if ((err = memcpy_fromiovecend(target, data, off, len)))
goto out;
copied = copy_from_iter(target, len, from);
if (copied != len)
return -EFAULT;
/* Adjust the chunk length field. */
chunk->chunk_hdr->length =
htons(ntohs(chunk->chunk_hdr->length) + len);
chunk->chunk_end = skb_tail_pointer(chunk->skb);
out:
return err;
return 0;
}
/* Helper function to assign a TSN if needed. This assumes that both

5
net/sctp/socket.c
View File

@ -1609,6 +1609,9 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
__u16 sinfo_flags = 0;
long timeo;
int err;
struct iov_iter from;
iov_iter_init(&from, WRITE, msg->msg_iov, msg->msg_iovlen, msg_len);
err = 0;
sp = sctp_sk(sk);
@ -1947,7 +1950,7 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
}
/* Break the message into multiple chunks of maximum size. */
datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
datamsg = sctp_datamsg_from_user(asoc, sinfo, &from);
if (IS_ERR(datamsg)) {
err = PTR_ERR(datamsg);
goto out_free;