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udp: fix skb_copy_and_csum_datagram with odd segment sizes
commit52cbd23a11
upstream. When iteratively computing a checksum with csum_block_add, track the offset "pos" to correctly rotate in csum_block_add when offset is odd. The open coded implementation of skb_copy_and_csum_datagram did this. With the switch to __skb_datagram_iter calling csum_and_copy_to_iter, pos was reinitialized to 0 on each call. Bring back the pos by passing it along with the csum to the callback. Changes v1->v2 - pass csum value, instead of csump pointer (Alexander Duyck) Link: https://lore.kernel.org/netdev/20210128152353.GB27281@optiplex/ Fixes:950fcaecd5
("datagram: consolidate datagram copy to iter helpers") Reported-by: Oliver Graute <oliver.graute@gmail.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Alexander Duyck <alexanderduyck@fb.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20210203192952.1849843-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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24f5544f76
commit
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3 changed files with 31 additions and 13 deletions
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@ -260,7 +260,13 @@ static inline void iov_iter_reexpand(struct iov_iter *i, size_t count)
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{
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i->count = count;
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}
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size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump, struct iov_iter *i);
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struct csum_state {
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__wsum csum;
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size_t off;
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};
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size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csstate, struct iov_iter *i);
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size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i);
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bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i);
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size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
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@ -592,14 +592,15 @@ static __wsum csum_and_memcpy(void *to, const void *from, size_t len,
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}
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static size_t csum_and_copy_to_pipe_iter(const void *addr, size_t bytes,
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__wsum *csum, struct iov_iter *i)
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struct csum_state *csstate,
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struct iov_iter *i)
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{
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struct pipe_inode_info *pipe = i->pipe;
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unsigned int p_mask = pipe->ring_size - 1;
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__wsum sum = csstate->csum;
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size_t off = csstate->off;
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unsigned int i_head;
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size_t n, r;
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size_t off = 0;
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__wsum sum = *csum;
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if (!sanity(i))
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return 0;
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@ -621,7 +622,8 @@ static size_t csum_and_copy_to_pipe_iter(const void *addr, size_t bytes,
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i_head++;
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} while (n);
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i->count -= bytes;
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*csum = sum;
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csstate->csum = sum;
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csstate->off = off;
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return bytes;
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}
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@ -1522,18 +1524,19 @@ bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum,
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}
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EXPORT_SYMBOL(csum_and_copy_from_iter_full);
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size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump,
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size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *_csstate,
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struct iov_iter *i)
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{
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struct csum_state *csstate = _csstate;
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const char *from = addr;
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__wsum *csum = csump;
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__wsum sum, next;
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size_t off = 0;
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size_t off;
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if (unlikely(iov_iter_is_pipe(i)))
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return csum_and_copy_to_pipe_iter(addr, bytes, csum, i);
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return csum_and_copy_to_pipe_iter(addr, bytes, _csstate, i);
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sum = *csum;
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sum = csstate->csum;
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off = csstate->off;
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if (unlikely(iov_iter_is_discard(i))) {
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WARN_ON(1); /* for now */
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return 0;
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@ -1561,7 +1564,8 @@ size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump,
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off += v.iov_len;
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})
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)
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*csum = sum;
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csstate->csum = sum;
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csstate->off = off;
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return bytes;
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}
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EXPORT_SYMBOL(csum_and_copy_to_iter);
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@ -721,8 +721,16 @@ static int skb_copy_and_csum_datagram(const struct sk_buff *skb, int offset,
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struct iov_iter *to, int len,
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__wsum *csump)
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{
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return __skb_datagram_iter(skb, offset, to, len, true,
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csum_and_copy_to_iter, csump);
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struct csum_state csdata = { .csum = *csump };
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int ret;
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ret = __skb_datagram_iter(skb, offset, to, len, true,
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csum_and_copy_to_iter, &csdata);
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if (ret)
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return ret;
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*csump = csdata.csum;
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return 0;
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}
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/**
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