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inet: Minimize use of cached route inetpeer.

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Only use it in the absolutely required cases:

1) COW'ing metrics

2) ipv4 PMTU

3) ipv4 redirects

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-10 03:58:16 -07:00
parent 16d1839907
commit 1d861aa4b3
5 changed files with 35 additions and 22 deletions
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3
net/ipv4/icmp.c
View File

@ -254,9 +254,10 @@ static inline bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
/* Limit if icmp type is enabled in ratemask. */
if ((1 << type) & net->ipv4.sysctl_icmp_ratemask) {
struct inet_peer *peer = rt_get_peer_create(rt, fl4->daddr);
struct inet_peer *peer = inet_getpeer_v4(net->ipv4.peers, fl4->daddr, 1);
rc = inet_peer_xrlim_allow(peer,
net->ipv4.sysctl_icmp_ratelimit);
inet_putpeer(peer);
}
out:
return rc;

32
net/ipv4/route.c
View File

@ -1289,20 +1289,15 @@ static void ip_select_fb_ident(struct iphdr *iph)
void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more)
{
struct rtable *rt = (struct rtable *) dst;
struct net *net = dev_net(dst->dev);
struct inet_peer *peer;
if (rt && !(rt->dst.flags & DST_NOPEER)) {
struct inet_peer *peer = rt_get_peer_create(rt, rt->rt_dst);
/* If peer is attached to destination, it is never detached,
so that we need not to grab a lock to dereference it.
*/
if (peer) {
iph->id = htons(inet_getid(peer, more));
return;
}
} else if (!rt)
pr_debug("rt_bind_peer(0) @%p\n", __builtin_return_address(0));
peer = inet_getpeer_v4(net->ipv4.peers, iph->daddr, 1);
if (peer) {
iph->id = htons(inet_getid(peer, more));
inet_putpeer(peer);
return;
}
ip_select_fb_ident(iph);
}
@ -1492,6 +1487,7 @@ void ip_rt_send_redirect(struct sk_buff *skb)
struct rtable *rt = skb_rtable(skb);
struct in_device *in_dev;
struct inet_peer *peer;
struct net *net;
int log_martians;
rcu_read_lock();
@ -1503,7 +1499,8 @@ void ip_rt_send_redirect(struct sk_buff *skb)
log_martians = IN_DEV_LOG_MARTIANS(in_dev);
rcu_read_unlock();
peer = rt_get_peer_create(rt, rt->rt_dst);
net = dev_net(rt->dst.dev);
peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, 1);
if (!peer) {
icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway);
return;
@ -1520,7 +1517,7 @@ void ip_rt_send_redirect(struct sk_buff *skb)
*/
if (peer->rate_tokens >= ip_rt_redirect_number) {
peer->rate_last = jiffies;
return;
goto out_put_peer;
}
/* Check for load limit; set rate_last to the latest sent
@ -1541,6 +1538,8 @@ void ip_rt_send_redirect(struct sk_buff *skb)
&rt->rt_dst, &rt->rt_gateway);
#endif
}
out_put_peer:
inet_putpeer(peer);
}
static int ip_error(struct sk_buff *skb)
@ -1583,7 +1582,7 @@ static int ip_error(struct sk_buff *skb)
break;
}
peer = rt_get_peer_create(rt, rt->rt_dst);
peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, 1);
send = true;
if (peer) {
@ -1596,6 +1595,7 @@ static int ip_error(struct sk_buff *skb)
peer->rate_tokens -= ip_rt_error_cost;
else
send = false;
inet_putpeer(peer);
}
if (send)
icmp_send(skb, ICMP_DEST_UNREACH, code, 0);

4
net/ipv6/icmp.c
View File

@ -194,8 +194,10 @@ static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
if (rt->rt6i_dst.plen < 128)
tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
peer = rt6_get_peer_create(rt);
peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
res = inet_peer_xrlim_allow(peer, tmo);
if (peer)
inet_putpeer(peer);
}
dst_release(dst);
return res;

10
net/ipv6/ip6_output.c
View File

@ -466,13 +466,15 @@ int ip6_forward(struct sk_buff *skb)
else
target = &hdr->daddr;
peer = rt6_get_peer_create(rt);
peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
/* Limit redirects both by destination (here)
and by source (inside ndisc_send_redirect)
*/
if (inet_peer_xrlim_allow(peer, 1*HZ))
ndisc_send_redirect(skb, target);
if (peer)
inet_putpeer(peer);
} else {
int addrtype = ipv6_addr_type(&hdr->saddr);
@ -592,10 +594,14 @@ void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
int old, new;
if (rt && !(rt->dst.flags & DST_NOPEER)) {
struct inet_peer *peer = rt6_get_peer_create(rt);
struct inet_peer *peer;
struct net *net;
net = dev_net(rt->dst.dev);
peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
if (peer) {
fhdr->identification = htonl(inet_getid(peer, 0));
inet_putpeer(peer);
return;
}
}

8
net/ipv6/ndisc.c
View File

@ -1486,6 +1486,7 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
int rd_len;
int err;
u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
bool ret;
if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n",
@ -1519,8 +1520,11 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
"Redirect: destination is not a neighbour\n");
goto release;
}
peer = rt6_get_peer_create(rt);
if (!inet_peer_xrlim_allow(peer, 1*HZ))
peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
ret = inet_peer_xrlim_allow(peer, 1*HZ);
if (peer)
inet_putpeer(peer);
if (!ret)
goto release;
if (dev->addr_len) {