#include <linux/in6.h>
#include <linux/route.h>
#include <linux/init.h>
+#include <linux/rcupdate.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#include <linux/if_arp.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
+#include <linux/jhash.h>
#include <net/sock.h>
#include <net/snmp.h>
#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
-static u8 *ndisc_fill_option(u8 *opt, int type, void *data, int data_len)
+/*
+ * Return the padding between the option length and the start of the
+ * link addr. Currently only IP-over-InfiniBand needs this, although
+ * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
+ * also need a pad of 2.
+ */
+static int ndisc_addr_option_pad(unsigned short type)
+{
+ switch (type) {
+ case ARPHRD_INFINIBAND: return 2;
+ default: return 0;
+ }
+}
+
+static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len,
+ unsigned short addr_type)
{
int space = NDISC_OPT_SPACE(data_len);
+ int pad = ndisc_addr_option_pad(addr_type);
opt[0] = type;
opt[1] = space>>3;
+
+ memset(opt + 2, 0, pad);
+ opt += pad;
+ space -= pad;
+
memcpy(opt+2, data, data_len);
data_len += 2;
opt += data_len;
case ARPHRD_ARCNET:
ipv6_arcnet_mc_map(addr, buf);
return 0;
+ case ARPHRD_INFINIBAND:
+ ipv6_ib_mc_map(addr, buf);
+ return 0;
default:
if (dir) {
memcpy(buf, dev->broadcast, dev->addr_len);
static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
{
- u32 hash_val;
+ const u32 *p32 = pkey;
+ u32 addr_hash, i;
- hash_val = *(u32*)(pkey + sizeof(struct in6_addr) - 4);
- hash_val ^= (hash_val>>16);
- hash_val ^= hash_val>>8;
- hash_val ^= hash_val>>3;
- hash_val = (hash_val^dev->ifindex)&NEIGH_HASHMASK;
+ addr_hash = 0;
+ for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++)
+ addr_hash ^= *p32++;
- return hash_val;
+ return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd);
}
static int ndisc_constructor(struct neighbour *neigh)
{
struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
struct net_device *dev = neigh->dev;
- struct inet6_dev *in6_dev = in6_dev_get(dev);
+ struct inet6_dev *in6_dev;
+ struct neigh_parms *parms;
int is_multicast = ipv6_addr_is_multicast(addr);
- if (in6_dev == NULL)
+ rcu_read_lock();
+ in6_dev = in6_dev_get(dev);
+ if (in6_dev == NULL) {
+ rcu_read_unlock();
return -EINVAL;
+ }
- if (in6_dev->nd_parms)
- neigh->parms = in6_dev->nd_parms;
+ parms = in6_dev->nd_parms;
+ __neigh_parms_put(neigh->parms);
+ neigh->parms = neigh_parms_clone(parms);
+ rcu_read_unlock();
neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
if (dev->hard_header == NULL) {
src_addr = solicited_addr;
in6_ifa_put(ifp);
} else {
- if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr, 0))
+ if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr))
return;
src_addr = &tmpaddr;
}
ipv6_addr_copy(&msg->target, solicited_addr);
if (inc_opt)
- ndisc_fill_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr, dev->addr_len);
+ ndisc_fill_addr_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr,
+ dev->addr_len, dev->type);
/* checksum */
msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len,
ipv6_addr_copy(&msg->target, solicit);
if (send_llinfo)
- ndisc_fill_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, dev->addr_len);
+ ndisc_fill_addr_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr,
+ dev->addr_len, dev->type);
/* checksum */
msg->icmph.icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr,
opt = (u8*) (hdr + 1);
if (dev->addr_len)
- ndisc_fill_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, dev->addr_len);
+ ndisc_fill_addr_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr,
+ dev->addr_len, dev->type);
/* checksum */
hdr->icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, daddr, len,
}
if (ndopts.nd_opts_src_lladdr) {
- lladdr = (u8*)(ndopts.nd_opts_src_lladdr + 1);
+ lladdr = (u8*)(ndopts.nd_opts_src_lladdr + 1) +
+ ndisc_addr_option_pad(dev->type);
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len)) {
ND_PRINTK2(KERN_WARNING
}
if (inc)
- nd_tbl.stats.rcv_probes_mcast++;
+ NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
else
- nd_tbl.stats.rcv_probes_ucast++;
+ NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
/*
* update / create cache entry
* for the source address
*/
- neigh = neigh_event_ns(&nd_tbl, lladdr, saddr, dev);
-
+ neigh = __neigh_lookup(&nd_tbl, saddr, dev,
+ !inc || lladdr || !dev->addr_len);
+ if (neigh)
+ neigh_update(neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE);
if (neigh || !dev->hard_header) {
ndisc_send_na(dev, neigh, saddr, &msg->target,
idev->cnf.forwarding,
return;
}
if (ndopts.nd_opts_tgt_lladdr) {
- lladdr = (u8*)(ndopts.nd_opts_tgt_lladdr + 1);
+ lladdr = (u8*)(ndopts.nd_opts_tgt_lladdr + 1) +
+ ndisc_addr_option_pad(dev->type);
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len)) {
ND_PRINTK2(KERN_WARNING
neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
if (neigh) {
- if (neigh->flags & NTF_ROUTER) {
- if (msg->icmph.icmp6_router == 0) {
- /*
- * Change: router to host
- */
- struct rt6_info *rt;
- rt = rt6_get_dflt_router(saddr, dev);
- if (rt)
- ip6_del_rt(rt, NULL, NULL);
- }
- } else {
- if (msg->icmph.icmp6_router)
- neigh->flags |= NTF_ROUTER;
- }
+ u8 old_flags = neigh->flags;
+
+ if (neigh->nud_state & NUD_FAILED)
+ goto out;
neigh_update(neigh, lladdr,
msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
- msg->icmph.icmp6_override, 1);
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
+ NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
+ (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
+
+ if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
+ /*
+ * Change: router to host
+ */
+ struct rt6_info *rt;
+ rt = rt6_get_dflt_router(saddr, dev);
+ if (rt)
+ ip6_del_rt(rt, NULL, NULL);
+ }
+
+out:
neigh_release(neigh);
}
}
+static void ndisc_recv_rs(struct sk_buff *skb)
+{
+ struct rs_msg *rs_msg = (struct rs_msg *) skb->h.raw;
+ unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
+ struct neighbour *neigh;
+ struct inet6_dev *idev;
+ struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
+ struct ndisc_options ndopts;
+ u8 *lladdr = NULL;
+ int lladdrlen = 0;
+
+ if (skb->len < sizeof(*rs_msg))
+ return;
+
+ idev = in6_dev_get(skb->dev);
+ if (!idev) {
+ if (net_ratelimit())
+ ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
+ return;
+ }
+
+ /* Don't accept RS if we're not in router mode */
+ if (!idev->cnf.forwarding)
+ goto out;
+
+ /*
+ * Don't update NCE if src = ::;
+ * this implies that the source node has no ip address assigned yet.
+ */
+ if (ipv6_addr_any(saddr))
+ goto out;
+
+ /* Parse ND options */
+ if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
+ if (net_ratelimit())
+ ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
+ goto out;
+ }
+
+ if (ndopts.nd_opts_src_lladdr) {
+ lladdr = (u8 *)(ndopts.nd_opts_src_lladdr + 1) +
+ ndisc_addr_option_pad(skb->dev->type);
+ lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
+ if (lladdrlen != NDISC_OPT_SPACE(skb->dev->addr_len))
+ goto out;
+ }
+
+ neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
+ if (neigh) {
+ neigh_update(neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
+ neigh_release(neigh);
+ }
+out:
+ in6_dev_put(idev);
+}
+
static void ndisc_router_discovery(struct sk_buff *skb)
{
struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw;
- struct neighbour *neigh;
+ struct neighbour *neigh = NULL;
struct inet6_dev *in6_dev;
struct rt6_info *rt;
int lifetime;
rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
+ if (rt)
+ neigh = rt->rt6i_nexthop;
+
if (rt && lifetime == 0) {
+ neigh_clone(neigh);
ip6_del_rt(rt, NULL, NULL);
rt = NULL;
}
return;
}
neigh->flags |= NTF_ROUTER;
-
- /*
- * If we where using an "all destinations on link" route
- * delete it
- */
-
- rt6_purge_dflt_routers(RTF_ALLONLINK);
}
if (rt)
* Process options.
*/
- if (rt && (neigh = rt->rt6i_nexthop) != NULL) {
+ if (!neigh)
+ neigh = __neigh_lookup(&nd_tbl, &skb->nh.ipv6h->saddr,
+ skb->dev, 1);
+ if (neigh) {
u8 *lladdr = NULL;
int lladdrlen;
if (ndopts.nd_opts_src_lladdr) {
- lladdr = (u8*)((ndopts.nd_opts_src_lladdr)+1);
+ lladdr = (u8*)((ndopts.nd_opts_src_lladdr)+1) +
+ ndisc_addr_option_pad(skb->dev->type);
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
if (lladdrlen != NDISC_OPT_SPACE(skb->dev->addr_len)) {
ND_PRINTK2(KERN_WARNING
goto out;
}
}
- neigh_update(neigh, lladdr, NUD_STALE, 1, 1);
+ neigh_update(neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
+ NEIGH_UPDATE_F_ISROUTER);
}
if (ndopts.nd_opts_pi) {
out:
if (rt)
dst_release(&rt->u.dst);
+ else if (neigh)
+ neigh_release(neigh);
in6_dev_put(in6_dev);
}
return;
}
- if (ipv6_addr_cmp(dest, target) == 0) {
+ if (ipv6_addr_equal(dest, target)) {
on_link = 1;
} else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) {
ND_PRINTK2(KERN_WARNING
return;
}
if (ndopts.nd_opts_tgt_lladdr) {
- lladdr = (u8*)(ndopts.nd_opts_tgt_lladdr + 1);
+ lladdr = (u8*)(ndopts.nd_opts_tgt_lladdr + 1) +
+ ndisc_addr_option_pad(skb->dev->type);
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
if (lladdrlen != NDISC_OPT_SPACE(skb->dev->addr_len)) {
ND_PRINTK2(KERN_WARNING
return;
}
}
- /* passed validation tests */
-
- /*
- We install redirect only if nexthop state is valid.
- */
neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
if (neigh) {
- neigh_update(neigh, lladdr, NUD_STALE, 1, 1);
- if (neigh->nud_state&NUD_VALID)
- rt6_redirect(dest, &skb->nh.ipv6h->saddr, neigh, on_link);
- else
- __neigh_event_send(neigh, NULL);
+ rt6_redirect(dest, &skb->nh.ipv6h->saddr, neigh, lladdr,
+ on_link);
neigh_release(neigh);
}
in6_dev_put(in6_dev);
*/
if (dev->addr_len)
- opt = ndisc_fill_option(opt, ND_OPT_TARGET_LL_ADDR, neigh->ha, dev->addr_len);
+ opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, neigh->ha,
+ dev->addr_len, dev->type);
/*
* build redirect option and copy skb over to the new packet.
ndisc_recv_na(skb);
break;
+ case NDISC_ROUTER_SOLICITATION:
+ ndisc_recv_rs(skb);
+ break;
+
case NDISC_ROUTER_ADVERTISEMENT:
ndisc_router_discovery(skb);
break;
git://git.onelab.eu / linux-2.6.git / blobdiff