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net: ipv4: place control buffer handling away from fragmentation iterators

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Deal with the IPCB() area away from the iterators.

The bridge codebase has its own control buffer layout, move specific
IP control buffer handling into the IPv4 codepath.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pablo Neira Ayuso 2019-05-29 13:25:35 +02:00 committed by David S. Miller
parent 8a6a1f1764
commit 19c3401a91
1 changed files with 37 additions and 18 deletions
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55
net/ipv4/ip_output.c
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@ -525,9 +525,6 @@ static void ip_copy_metadata(struct sk_buff *to, struct sk_buff *from)
skb_copy_hash(to, from);
/* Copy the flags to each fragment. */
IPCB(to)->flags = IPCB(from)->flags;
#ifdef CONFIG_NET_SCHED
to->tc_index = from->tc_index;
#endif
@ -582,6 +579,18 @@ void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph,
}
EXPORT_SYMBOL(ip_fraglist_init);
static void ip_fraglist_ipcb_prepare(struct sk_buff *skb,
struct ip_fraglist_iter *iter)
{
struct sk_buff *to = iter->frag;
/* Copy the flags to each fragment. */
IPCB(to)->flags = IPCB(skb)->flags;
if (iter->offset == 0)
ip_options_fragment(to);
}
void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter)
{
unsigned int hlen = iter->hlen;
@ -598,8 +607,6 @@ void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter)
iph = iter->iph;
iph->tot_len = htons(frag->len);
ip_copy_metadata(frag, skb);
if (iter->offset == 0)
ip_options_fragment(frag);
iter->offset += skb->len - hlen;
iph->frag_off = htons(iter->offset >> 3);
if (frag->next)
@ -627,6 +634,25 @@ void ip_frag_init(struct sk_buff *skb, unsigned int hlen,
}
EXPORT_SYMBOL(ip_frag_init);
static void ip_frag_ipcb(struct sk_buff *from, struct sk_buff *to,
bool first_frag, struct ip_frag_state *state)
{
/* Copy the flags to each fragment. */
IPCB(to)->flags = IPCB(from)->flags;
if (IPCB(from)->flags & IPSKB_FRAG_PMTU)
state->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
* on the initial skb, so that all the following fragments
* will inherit fixed options.
*/
if (first_frag)
ip_options_fragment(from);
}
struct sk_buff *ip_frag_next(struct sk_buff *skb, struct ip_frag_state *state)
{
unsigned int len = state->left;
@ -685,18 +711,6 @@ struct sk_buff *ip_frag_next(struct sk_buff *skb, struct ip_frag_state *state)
iph = ip_hdr(skb2);
iph->frag_off = htons((state->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
* on the initial skb, so that all the following fragments
* will inherit fixed options.
*/
if (state->offset == 0)
ip_options_fragment(skb);
/*
* Added AC : If we are fragmenting a fragment that's not the
* last fragment then keep MF on each bit
@ -799,8 +813,10 @@ int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
for (;;) {
/* Prepare header of the next frame,
* before previous one went down. */
if (iter.frag)
if (iter.frag) {
ip_fraglist_ipcb_prepare(skb, &iter);
ip_fraglist_prepare(skb, &iter);
}
err = output(net, sk, skb);
@ -844,11 +860,14 @@ int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
*/
while (state.left > 0) {
bool first_frag = (state.offset == 0);
skb2 = ip_frag_next(skb, &state);
if (IS_ERR(skb2)) {
err = PTR_ERR(skb2);
goto fail;
}
ip_frag_ipcb(skb, skb2, first_frag, &state);
/*
* Put this fragment into the sending queue.