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, 4 insertions, 4 deletions

diff --git a/net/ipv4/inet_lro.c b/net/ipv4/inet_lro.c
index 8e6be5aad115..cc280a3f4f96 100644
--- a/net/ipv4/inet_lro.c
+++ b/net/ipv4/inet_lro.c
@@ -244,11 +244,11 @@ static void lro_add_frags(struct net_lro_desc *lro_desc,
         skb->truesize += truesize;
 
         skb_frags[0].page_offset += hlen;
-        skb_frags[0].size -= hlen;
+        skb_frag_size_sub(&skb_frags[0], hlen);
 
         while (tcp_data_len > 0) {
                 *(lro_desc->next_frag) = *skb_frags;
-                tcp_data_len -= skb_frags->size;
+                tcp_data_len -= skb_frag_size(skb_frags);
                 lro_desc->next_frag++;
                 skb_frags++;
                 skb_shinfo(skb)->nr_frags++;
@@ -400,14 +400,14 @@ static struct sk_buff *lro_gen_skb(struct net_lro_mgr *lro_mgr,
         skb_frags = skb_shinfo(skb)->frags;
         while (data_len > 0) {
                 *skb_frags = *frags;
-                data_len -= frags->size;
+                data_len -= skb_frag_size(frags);
                 skb_frags++;
                 frags++;
                 skb_shinfo(skb)->nr_frags++;
         }
 
         skb_shinfo(skb)->frags[0].page_offset += hdr_len;
-        skb_shinfo(skb)->frags[0].size -= hdr_len;
+        skb_frag_size_sub(&skb_shinfo(skb)->frags[0], hdr_len);
 
         skb->ip_summed = ip_summed;
         skb->csum = sum;