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ipv4: Lookup multicast routes by rtable using helper.

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Create a common helper for this operation, since we do
it identically in three spots.

Suggested by Eric Dumazet.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-03-09 14:06:20 -08:00
parent bd33acc3cc
commit ee3f1aaf93
1 changed files with 28 additions and 42 deletions
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64
net/ipv4/ipmr.c
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@ -1793,6 +1793,24 @@ dont_forward:
return 0;
}
static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct rtable *rt)
{
struct flowi fl = {
.fl4_dst = rt->rt_key_dst,
.fl4_src = rt->rt_key_src,
.fl4_tos = rt->rt_tos,
.oif = rt->rt_oif,
.iif = rt->rt_iif,
.mark = rt->rt_mark,
};
struct mr_table *mrt;
int err;
err = ipmr_fib_lookup(net, &fl, &mrt);
if (err)
return ERR_PTR(err);
return mrt;
}
/*
* Multicast packets for forwarding arrive here
@ -1805,7 +1823,6 @@ int ip_mr_input(struct sk_buff *skb)
struct net *net = dev_net(skb->dev);
int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
struct mr_table *mrt;
int err;
/* Packet is looped back after forward, it should not be
* forwarded second time, but still can be delivered locally.
@ -1813,21 +1830,10 @@ int ip_mr_input(struct sk_buff *skb)
if (IPCB(skb)->flags & IPSKB_FORWARDED)
goto dont_forward;
{
struct rtable *rt = skb_rtable(skb);
struct flowi fl = {
.fl4_dst = rt->rt_key_dst,
.fl4_src = rt->rt_key_src,
.fl4_tos = rt->rt_tos,
.oif = rt->rt_oif,
.iif = rt->rt_iif,
.mark = rt->rt_mark,
};
err = ipmr_fib_lookup(net, &fl, &mrt);
if (err < 0) {
mrt = ipmr_rt_fib_lookup(net, skb_rtable(skb));
if (IS_ERR(mrt)) {
kfree_skb(skb);
return err;
}
return PTR_ERR(mrt);
}
if (!local) {
if (IPCB(skb)->opt.router_alert) {
@ -1956,19 +1962,9 @@ int pim_rcv_v1(struct sk_buff *skb)
pim = igmp_hdr(skb);
{
struct rtable *rt = skb_rtable(skb);
struct flowi fl = {
.fl4_dst = rt->rt_key_dst,
.fl4_src = rt->rt_key_src,
.fl4_tos = rt->rt_tos,
.oif = rt->rt_oif,
.iif = rt->rt_iif,
.mark = rt->rt_mark,
};
if (ipmr_fib_lookup(net, &fl, &mrt) < 0)
mrt = ipmr_rt_fib_lookup(net, skb_rtable(skb));
if (IS_ERR(mrt))
goto drop;
}
if (!mrt->mroute_do_pim ||
pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
goto drop;
@ -1998,19 +1994,9 @@ static int pim_rcv(struct sk_buff *skb)
csum_fold(skb_checksum(skb, 0, skb->len, 0))))
goto drop;
{
struct rtable *rt = skb_rtable(skb);
struct flowi fl = {
.fl4_dst = rt->rt_key_dst,
.fl4_src = rt->rt_key_src,
.fl4_tos = rt->rt_tos,
.oif = rt->rt_oif,
.iif = rt->rt_iif,
.mark = rt->rt_mark,
};
if (ipmr_fib_lookup(net, &fl, &mrt) < 0)
mrt = ipmr_rt_fib_lookup(net, skb_rtable(skb));
if (IS_ERR(mrt))
goto drop;
}
if (__pim_rcv(mrt, skb, sizeof(*pim))) {
drop:
kfree_skb(skb);