diff options
Diffstat (limited to 'net/ipv4/ip_output.c')
| -rw-r--r-- | net/ipv4/ip_output.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index d6dd8ba04441..f5f5ef1cebd5 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -278,7 +278,7 @@ static int ip_finish_output(struct sock *sk, struct sk_buff *skb) if (skb_is_gso(skb)) return ip_finish_output_gso(sk, skb, mtu); - if (skb->len > mtu) + if (skb->len > mtu || (IPCB(skb)->flags & IPSKB_FRAG_PMTU)) return ip_fragment(sk, skb, mtu, ip_finish_output2); return ip_finish_output2(sk, skb); @@ -492,7 +492,10 @@ static int ip_fragment(struct sock *sk, struct sk_buff *skb, { struct iphdr *iph = ip_hdr(skb); - if (unlikely(((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) || + if ((iph->frag_off & htons(IP_DF)) == 0) + return ip_do_fragment(sk, skb, output); + + if (unlikely(!skb->ignore_df || (IPCB(skb)->frag_max_size && IPCB(skb)->frag_max_size > mtu))) { struct rtable *rt = skb_rtable(skb); @@ -537,6 +540,8 @@ int ip_do_fragment(struct sock *sk, struct sk_buff *skb, iph = ip_hdr(skb); mtu = ip_skb_dst_mtu(skb); + if (IPCB(skb)->frag_max_size && IPCB(skb)->frag_max_size < mtu) + mtu = IPCB(skb)->frag_max_size; /* * Setup starting values. @@ -732,6 +737,9 @@ slow_path: iph = ip_hdr(skb2); iph->frag_off = htons((offset >> 3)); + if (IPCB(skb)->flags & IPSKB_FRAG_PMTU) + iph->frag_off |= htons(IP_DF); + /* ANK: dirty, but effective trick. Upgrade options only if * the segment to be fragmented was THE FIRST (otherwise, * options are already fixed) and make it ONCE |