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[IPV6] MIP6: Report to user-space when home address option is rejected.

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Report to user-space when home address option is rejected.
In receiving this message user-space application will send Mobile IPv6 binding
error. It is rate-limited by kernel.
Based on MIPL2 kernel patch.

This patch was also written by: Ville Nuorvala <vnuorval@tcs.hut.fi>

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Masahide NAKAMURA 2006-08-23 20:45:55 -07:00 committed by David S. Miller
parent 97a64b4577
commit 70182ed23d
1 changed files with 83 additions and 0 deletions
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83
net/ipv6/mip6.c
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@ -25,6 +25,7 @@
#include <linux/config.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/time.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <net/sock.h>
@ -138,6 +139,18 @@ int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
return 0;
}
struct mip6_report_rate_limiter {
spinlock_t lock;
struct timeval stamp;
int iif;
struct in6_addr src;
struct in6_addr dst;
};
static struct mip6_report_rate_limiter mip6_report_rl = {
.lock = SPIN_LOCK_UNLOCKED
};
static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
{
struct ipv6hdr *iph = skb->nh.ipv6h;
@ -189,6 +202,75 @@ static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
return 0;
}
static inline int mip6_report_rl_allow(struct timeval *stamp,
struct in6_addr *dst,
struct in6_addr *src, int iif)
{
int allow = 0;
spin_lock_bh(&mip6_report_rl.lock);
if (mip6_report_rl.stamp.tv_sec != stamp->tv_sec ||
mip6_report_rl.stamp.tv_usec != stamp->tv_usec ||
mip6_report_rl.iif != iif ||
!ipv6_addr_equal(&mip6_report_rl.src, src) ||
!ipv6_addr_equal(&mip6_report_rl.dst, dst)) {
mip6_report_rl.stamp.tv_sec = stamp->tv_sec;
mip6_report_rl.stamp.tv_usec = stamp->tv_usec;
mip6_report_rl.iif = iif;
ipv6_addr_copy(&mip6_report_rl.src, src);
ipv6_addr_copy(&mip6_report_rl.dst, dst);
allow = 1;
}
spin_unlock_bh(&mip6_report_rl.lock);
return allow;
}
static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb, struct flowi *fl)
{
struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb;
struct ipv6_destopt_hao *hao = NULL;
struct xfrm_selector sel;
int offset;
struct timeval stamp;
int err = 0;
if (likely(opt->dsthao)) {
offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
if (likely(offset >= 0))
hao = (struct ipv6_destopt_hao *)(skb->nh.raw + offset);
}
skb_get_timestamp(skb, &stamp);
if (!mip6_report_rl_allow(&stamp, &skb->nh.ipv6h->daddr,
hao ? &hao->addr : &skb->nh.ipv6h->saddr,
opt->iif))
goto out;
memset(&sel, 0, sizeof(sel));
memcpy(&sel.daddr, (xfrm_address_t *)&skb->nh.ipv6h->daddr,
sizeof(sel.daddr));
sel.prefixlen_d = 128;
memcpy(&sel.saddr, (xfrm_address_t *)&skb->nh.ipv6h->saddr,
sizeof(sel.saddr));
sel.prefixlen_s = 128;
sel.family = AF_INET6;
sel.proto = fl->proto;
sel.dport = xfrm_flowi_dport(fl);
if (sel.dport)
sel.dport_mask = ~((__u16)0);
sel.sport = xfrm_flowi_sport(fl);
if (sel.sport)
sel.sport_mask = ~((__u16)0);
sel.ifindex = fl->oif;
err = km_report(IPPROTO_DSTOPTS, &sel,
(hao ? (xfrm_address_t *)&hao->addr : NULL));
out:
return err;
}
static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
u8 **nexthdr)
{
@ -273,6 +355,7 @@ static struct xfrm_type mip6_destopt_type =
.destructor = mip6_destopt_destroy,
.input = mip6_destopt_input,
.output = mip6_destopt_output,
.reject = mip6_destopt_reject,
.hdr_offset = mip6_destopt_offset,
.local_addr = mip6_xfrm_addr,
};