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[NETNS]: Routing cache virtualization.

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Basically, this piece looks relatively easy. Namespace is already
available on the dst entry via device and the device is safe to
dereferrence. Compare it with one of a searcher and skip entry if
appropriate.

The only exception is ip_rt_frag_needed. So, add namespace parameter to it.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev 2008-01-22 23:50:25 -08:00 committed by David S. Miller
parent eee80592c3
commit b5921910a1
3 changed files with 18 additions and 7 deletions
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2
include/net/route.h
View File

@ -115,7 +115,7 @@ extern int __ip_route_output_key(struct net *, struct rtable **, const struct f
extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu);
extern void ip_rt_send_redirect(struct sk_buff *skb);
extern unsigned inet_addr_type(struct net *net, __be32 addr);

2
net/ipv4/icmp.c
View File

@ -696,7 +696,7 @@ static void icmp_unreach(struct sk_buff *skb)
"and DF set.\n",
NIPQUAD(iph->daddr));
} else {
info = ip_rt_frag_needed(iph,
info = ip_rt_frag_needed(&init_net, iph,
ntohs(icmph->un.frag.mtu));
if (!info)
goto out;

21
net/ipv4/route.c
View File

@ -648,6 +648,11 @@ static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
(fl1->iif ^ fl2->iif)) == 0;
}
static inline int compare_netns(struct rtable *rt1, struct rtable *rt2)
{
return rt1->u.dst.dev->nd_net == rt2->u.dst.dev->nd_net;
}
/*
* Perform a full scan of hash table and free all entries.
* Can be called by a softirq or a process.
@ -961,7 +966,7 @@ restart:
spin_lock_bh(rt_hash_lock_addr(hash));
while ((rth = *rthp) != NULL) {
if (compare_keys(&rth->fl, &rt->fl)) {
if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) {
/* Put it first */
*rthp = rth->u.dst.rt_next;
/*
@ -1415,7 +1420,8 @@ static __inline__ unsigned short guess_mtu(unsigned short old_mtu)
return 68;
}
unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu)
unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
unsigned short new_mtu)
{
int i;
unsigned short old_mtu = ntohs(iph->tot_len);
@ -1438,7 +1444,8 @@ unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu)
rth->rt_dst == daddr &&
rth->rt_src == iph->saddr &&
rth->fl.iif == 0 &&
!(dst_metric_locked(&rth->u.dst, RTAX_MTU))) {
!(dst_metric_locked(&rth->u.dst, RTAX_MTU)) &&
rth->u.dst.dev->nd_net == net) {
unsigned short mtu = new_mtu;
if (new_mtu < 68 || new_mtu >= old_mtu) {
@ -2049,7 +2056,9 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
struct rtable * rth;
unsigned hash;
int iif = dev->ifindex;
struct net *net;
net = skb->dev->nd_net;
tos &= IPTOS_RT_MASK;
hash = rt_hash(daddr, saddr, iif);
@ -2061,7 +2070,8 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
rth->fl.iif == iif &&
rth->fl.oif == 0 &&
rth->fl.mark == skb->mark &&
rth->fl.fl4_tos == tos) {
rth->fl.fl4_tos == tos &&
rth->u.dst.dev->nd_net == net) {
dst_use(&rth->u.dst, jiffies);
RT_CACHE_STAT_INC(in_hit);
rcu_read_unlock();
@ -2460,7 +2470,8 @@ int __ip_route_output_key(struct net *net, struct rtable **rp,
rth->fl.oif == flp->oif &&
rth->fl.mark == flp->mark &&
!((rth->fl.fl4_tos ^ flp->fl4_tos) &
(IPTOS_RT_MASK | RTO_ONLINK))) {
(IPTOS_RT_MASK | RTO_ONLINK)) &&
rth->u.dst.dev->nd_net == net) {
dst_use(&rth->u.dst, jiffies);
RT_CACHE_STAT_INC(out_hit);
rcu_read_unlock_bh();