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[IPV4]: Move ip options parsing out of ip_rcv_finish()

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Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2005-08-20 17:26:12 -07:00 committed by David S. Miller
parent e9c6042273
commit d245407e75
1 changed files with 54 additions and 39 deletions
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93
net/ipv4/ip_input.c
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@ -279,6 +279,58 @@ int ip_local_deliver(struct sk_buff *skb)
ip_local_deliver_finish); ip_local_deliver_finish);
} }
static inline int ip_rcv_options(struct sk_buff *skb)
{
struct ip_options *opt;
struct iphdr *iph;
struct net_device *dev = skb->dev;
/* It looks as overkill, because not all
IP options require packet mangling.
But it is the easiest for now, especially taking
into account that combination of IP options
and running sniffer is extremely rare condition.
--ANK (980813)
*/
if (skb_cow(skb, skb_headroom(skb))) {
IP_INC_STATS_BH(IPSTATS_MIB_INDISCARDS);
goto drop;
}
iph = skb->nh.iph;
if (ip_options_compile(NULL, skb)) {
IP_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
goto drop;
}
opt = &(IPCB(skb)->opt);
if (unlikely(opt->srr)) {
struct in_device *in_dev = in_dev_get(dev);
if (in_dev) {
if (!IN_DEV_SOURCE_ROUTE(in_dev)) {
if (IN_DEV_LOG_MARTIANS(in_dev) &&
net_ratelimit())
printk(KERN_INFO "source route option "
"%u.%u.%u.%u -> %u.%u.%u.%u\n",
NIPQUAD(iph->saddr),
NIPQUAD(iph->daddr));
in_dev_put(in_dev);
goto drop;
}
in_dev_put(in_dev);
}
if (ip_options_rcv_srr(skb))
goto drop;
}
return 0;
drop:
return -1;
}
static inline int ip_rcv_finish(struct sk_buff *skb) static inline int ip_rcv_finish(struct sk_buff *skb)
{ {
struct net_device *dev = skb->dev; struct net_device *dev = skb->dev;
@ -308,48 +360,11 @@ static inline int ip_rcv_finish(struct sk_buff *skb)
} }
#endif #endif
if (iph->ihl > 5) { if (iph->ihl > 5 && ip_rcv_options(skb))
struct ip_options *opt; goto drop;
/* It looks as overkill, because not all
IP options require packet mangling.
But it is the easiest for now, especially taking
into account that combination of IP options
and running sniffer is extremely rare condition.
--ANK (980813)
*/
if (skb_cow(skb, skb_headroom(skb))) {
IP_INC_STATS_BH(IPSTATS_MIB_INDISCARDS);
goto drop;
}
iph = skb->nh.iph;
if (ip_options_compile(NULL, skb))
goto inhdr_error;
opt = &(IPCB(skb)->opt);
if (opt->srr) {
struct in_device *in_dev = in_dev_get(dev);
if (in_dev) {
if (!IN_DEV_SOURCE_ROUTE(in_dev)) {
if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit())
printk(KERN_INFO "source route option %u.%u.%u.%u -> %u.%u.%u.%u\n",
NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
in_dev_put(in_dev);
goto drop;
}
in_dev_put(in_dev);
}
if (ip_options_rcv_srr(skb))
goto drop;
}
}
return dst_input(skb); return dst_input(skb);
inhdr_error:
IP_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
drop: drop:
kfree_skb(skb); kfree_skb(skb);
return NET_RX_DROP; return NET_RX_DROP;