* Masahide NAKAMURA @USAGI
*/
-#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>
#include <net/ipv6.h>
+#include <net/ip6_checksum.h>
#include <net/xfrm.h>
#include <net/mip6.h>
return data + padlen;
}
+static inline void mip6_param_prob(struct sk_buff *skb, int code, int pos)
+{
+ icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev);
+}
+
+static int mip6_mh_len(int type)
+{
+ int len = 0;
+
+ switch (type) {
+ case IP6_MH_TYPE_BRR:
+ len = 0;
+ break;
+ case IP6_MH_TYPE_HOTI:
+ case IP6_MH_TYPE_COTI:
+ case IP6_MH_TYPE_BU:
+ case IP6_MH_TYPE_BACK:
+ len = 1;
+ break;
+ case IP6_MH_TYPE_HOT:
+ case IP6_MH_TYPE_COT:
+ case IP6_MH_TYPE_BERROR:
+ len = 2;
+ break;
+ }
+ return len;
+}
+
+int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
+{
+ struct ip6_mh *mh;
+
+ if (!pskb_may_pull(skb, (skb_transport_offset(skb)) + 8) ||
+ !pskb_may_pull(skb, (skb_transport_offset(skb) +
+ ((skb_transport_header(skb)[1] + 1) << 3))))
+ return -1;
+
+ mh = (struct ip6_mh *)skb_transport_header(skb);
+
+ if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) {
+ LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH message too short: %d vs >=%d\n",
+ mh->ip6mh_hdrlen, mip6_mh_len(mh->ip6mh_type));
+ mip6_param_prob(skb, 0, ((&mh->ip6mh_hdrlen) -
+ skb_network_header(skb)));
+ return -1;
+ }
+
+ if (mh->ip6mh_proto != IPPROTO_NONE) {
+ LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH invalid payload proto = %d\n",
+ mh->ip6mh_proto);
+ mip6_param_prob(skb, 0, ((&mh->ip6mh_proto) -
+ skb_network_header(skb)));
+ return -1;
+ }
+
+ 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(mip6_report_rl.lock)
+};
+
static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
{
- struct ipv6hdr *iph = skb->nh.ipv6h;
+ struct ipv6hdr *iph = ipv6_hdr(skb);
struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data;
if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
iph = (struct ipv6hdr *)skb->data;
iph->payload_len = htons(skb->len - sizeof(*iph));
- nexthdr = *skb->nh.raw;
- *skb->nh.raw = IPPROTO_DSTOPTS;
+ nexthdr = *skb_network_header(skb);
+ *skb_network_header(skb) = IPPROTO_DSTOPTS;
- dstopt = (struct ipv6_destopt_hdr *)skb->h.raw;
+ dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb);
dstopt->nexthdr = nexthdr;
hao = mip6_padn((char *)(dstopt + 1),
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 (unlikely(fl->proto == IPPROTO_MH &&
+ fl->fl_mh_type <= IP6_MH_TYPE_MAX))
+ goto out;
+
+ if (likely(opt->dsthao)) {
+ offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
+ if (likely(offset >= 0))
+ hao = (struct ipv6_destopt_hao *)
+ (skb_network_header(skb) + offset);
+ }
+
+ skb_get_timestamp(skb, &stamp);
+
+ if (!mip6_report_rl_allow(&stamp, &ipv6_hdr(skb)->daddr,
+ hao ? &hao->addr : &ipv6_hdr(skb)->saddr,
+ opt->iif))
+ goto out;
+
+ memset(&sel, 0, sizeof(sel));
+ memcpy(&sel.daddr, (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
+ sizeof(sel.daddr));
+ sel.prefixlen_d = 128;
+ memcpy(&sel.saddr, (xfrm_address_t *)&ipv6_hdr(skb)->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 = htons(~0);
+ sel.sport = xfrm_flowi_sport(fl);
+ if (sel.sport)
+ sel.sport_mask = htons(~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)
{
u16 offset = sizeof(struct ipv6hdr);
- struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
- unsigned int packet_len = skb->tail - skb->nh.raw;
+ struct ipv6_opt_hdr *exthdr =
+ (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
+ const unsigned char *nh = skb_network_header(skb);
+ unsigned int packet_len = skb->tail - skb->network_header;
int found_rhdr = 0;
- *nexthdr = &skb->nh.ipv6h->nexthdr;
+ *nexthdr = &ipv6_hdr(skb)->nexthdr;
while (offset + 1 <= packet_len) {
offset += ipv6_optlen(exthdr);
*nexthdr = &exthdr->nexthdr;
- exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+ exthdr = (struct ipv6_opt_hdr *)(nh + offset);
}
return offset;
.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,
};
iph = (struct ipv6hdr *)skb->data;
iph->payload_len = htons(skb->len - sizeof(*iph));
- nexthdr = *skb->nh.raw;
- *skb->nh.raw = IPPROTO_ROUTING;
+ nexthdr = *skb_network_header(skb);
+ *skb_network_header(skb) = IPPROTO_ROUTING;
- rt2 = (struct rt2_hdr *)skb->h.raw;
+ rt2 = (struct rt2_hdr *)skb_transport_header(skb);
rt2->rt_hdr.nexthdr = nexthdr;
rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
u8 **nexthdr)
{
u16 offset = sizeof(struct ipv6hdr);
- struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
- unsigned int packet_len = skb->tail - skb->nh.raw;
+ struct ipv6_opt_hdr *exthdr =
+ (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
+ const unsigned char *nh = skb_network_header(skb);
+ unsigned int packet_len = skb->tail - skb->network_header;
int found_rhdr = 0;
- *nexthdr = &skb->nh.ipv6h->nexthdr;
+ *nexthdr = &ipv6_hdr(skb)->nexthdr;
while (offset + 1 <= packet_len) {
case NEXTHDR_ROUTING:
if (offset + 3 <= packet_len) {
struct ipv6_rt_hdr *rt;
- rt = (struct ipv6_rt_hdr *)(skb->nh.raw + offset);
+ rt = (struct ipv6_rt_hdr *)(nh + offset);
if (rt->type != 0)
return offset;
}
offset += ipv6_optlen(exthdr);
*nexthdr = &exthdr->nexthdr;
- exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+ exthdr = (struct ipv6_opt_hdr *)(nh + offset);
}
return offset;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff