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net/ipv4: Introduce IPSKB_FRAG_SEGS bit to inet_skb_parm.flags 

This flag indicates whether fragmentation of segments is allowed.

Formerly this policy was hardcoded according to IPSKB_FORWARDED (set by
either ip_forward or ipmr_forward).

Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shmulik Ladkani 2016-07-18 14:49:33 +03:00 committed by David S. Miller
parent dfa15378bd
commit 359ebda25a
4 changed files with 7 additions and 4 deletions
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1
include/net/ip.h
View File

@ -47,6 +47,7 @@ struct inet_skb_parm {
#define IPSKB_REROUTED BIT(4)
#define IPSKB_DOREDIRECT BIT(5)
#define IPSKB_FRAG_PMTU BIT(6)
#define IPSKB_FRAG_SEGS BIT(7)
u16 frag_max_size;
};

2
net/ipv4/ip_forward.c
View File

@ -117,7 +117,7 @@ int ip_forward(struct sk_buff *skb)
if (opt->is_strictroute && rt->rt_uses_gateway)
goto sr_failed;
IPCB(skb)->flags |= IPSKB_FORWARDED;
IPCB(skb)->flags |= IPSKB_FORWARDED | IPSKB_FRAG_SEGS;
mtu = ip_dst_mtu_maybe_forward(&rt->dst, true);
if (ip_exceeds_mtu(skb, mtu)) {
IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);

6
net/ipv4/ip_output.c
View File

@ -223,8 +223,10 @@ static int ip_finish_output_gso(struct net *net, struct sock *sk,
struct sk_buff *segs;
int ret = 0;
/* common case: locally created skb or seglen is <= mtu */
if (((IPCB(skb)->flags & IPSKB_FORWARDED) == 0) ||
/* common case: fragmentation of segments is not allowed,
* or seglen is <= mtu
*/
if (((IPCB(skb)->flags & IPSKB_FRAG_SEGS) == 0) ||
skb_gso_validate_mtu(skb, mtu))
return ip_finish_output2(net, sk, skb);

2
net/ipv4/ipmr.c
View File

@ -1749,7 +1749,7 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
vif->dev->stats.tx_bytes += skb->len;
}
IPCB(skb)->flags |= IPSKB_FORWARDED;
IPCB(skb)->flags |= IPSKB_FORWARDED | IPSKB_FRAG_SEGS;
/* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
* not only before forwarding, but after forwarding on all output