[IPV6] MIP6: Report to user-space when home address option is rejected.
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>
diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
index 7b5f893..31445d0 100644
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c
@@ -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 @@
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 @@
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 @@
.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,
};
