net: add skb frag size accessors

To ease skb->truesize sanitization, its better to be able to localize
all references to skb frags size.

Define accessors : skb_frag_size() to fetch frag size, and
skb_frag_size_{set|add|sub}() to manipulate it.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index ae3bb147affd..e1374ab034bb 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1015,13 +1015,13 @@ alloc_new_skb:
                                 err = -EMSGSIZE;
                                 goto error;
                         }
-                        if (getfrag(from, skb_frag_address(frag)+frag->size,
+                        if (getfrag(from, skb_frag_address(frag)+skb_frag_size(frag),
                                     offset, copy, skb->len, skb) < 0) {
                                 err = -EFAULT;
                                 goto error;
                         }
                         cork->off += copy;
-                        frag->size += copy;
+                        skb_frag_size_add(frag, copy);
                         skb->len += copy;
                         skb->data_len += copy;
                         skb->truesize += copy;
@@ -1230,7 +1230,7 @@ ssize_t	ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
                 if (len > size)
                         len = size;
                 if (skb_can_coalesce(skb, i, page, offset)) {
-                        skb_shinfo(skb)->frags[i-1].size += len;
+                        skb_frag_size_add(&skb_shinfo(skb)->frags[i-1], len);
                 } else if (i < MAX_SKB_FRAGS) {
                         get_page(page);
                         skb_fill_page_desc(skb, i, page, offset, len);