[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/net/ipv6/route.c b/ap/os/linux/linux-3.4.x/net/ipv6/route.c
new file mode 100644
index 0000000..2730524
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/ipv6/route.c
@@ -0,0 +1,3126 @@
+/*
+ * Linux INET6 implementation
+ * FIB front-end.
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/* Changes:
+ *
+ * YOSHIFUJI Hideaki @USAGI
+ * reworked default router selection.
+ * - respect outgoing interface
+ * - select from (probably) reachable routers (i.e.
+ * routers in REACHABLE, STALE, DELAY or PROBE states).
+ * - always select the same router if it is (probably)
+ * reachable. otherwise, round-robin the list.
+ * Ville Nuorvala
+ * Fixed routing subtrees.
+ */
+
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/times.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/route.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/mroute6.h>
+#include <linux/init.h>
+#include <linux/if_arp.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/nsproxy.h>
+#include <linux/slab.h>
+#include <net/net_namespace.h>
+#include <net/snmp.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/tcp.h>
+#include <linux/rtnetlink.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+#include <net/netevent.h>
+#include <net/netlink.h>
+
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+
+static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
+ const struct in6_addr *dest);
+static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
+static unsigned int ip6_default_advmss(const struct dst_entry *dst);
+static unsigned int ip6_mtu(const struct dst_entry *dst);
+static struct dst_entry *ip6_negative_advice(struct dst_entry *);
+static void ip6_dst_destroy(struct dst_entry *);
+static void ip6_dst_ifdown(struct dst_entry *,
+ struct net_device *dev, int how);
+static int ip6_dst_gc(struct dst_ops *ops);
+
+static int ip6_pkt_discard(struct sk_buff *skb);
+static int ip6_pkt_discard_out(struct sk_buff *skb);
+static void ip6_link_failure(struct sk_buff *skb);
+static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
+
+#ifdef CONFIG_IPV6_ROUTE_INFO
+static struct rt6_info *rt6_add_route_info(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ const struct in6_addr *gwaddr, int ifindex,
+ unsigned pref);
+static struct rt6_info *rt6_get_route_info(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ const struct in6_addr *gwaddr, int ifindex);
+#endif
+
+static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
+{
+ struct rt6_info *rt = (struct rt6_info *) dst;
+ struct inet_peer *peer;
+ u32 *p = NULL;
+
+ if (!(rt->dst.flags & DST_HOST))
+ return dst_cow_metrics_generic(dst, old);
+
+ if (!rt->rt6i_peer)
+ rt6_bind_peer(rt, 1);
+
+ peer = rt->rt6i_peer;
+ if (peer) {
+ u32 *old_p = __DST_METRICS_PTR(old);
+ unsigned long prev, new;
+
+ p = peer->metrics;
+ if (inet_metrics_new(peer))
+ memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
+
+ new = (unsigned long) p;
+ prev = cmpxchg(&dst->_metrics, old, new);
+
+ if (prev != old) {
+ p = __DST_METRICS_PTR(prev);
+ if (prev & DST_METRICS_READ_ONLY)
+ p = NULL;
+ }
+ }
+ return p;
+}
+
+static inline const void *choose_neigh_daddr(struct rt6_info *rt, const void *daddr)
+{
+ struct in6_addr *p = &rt->rt6i_gateway;
+
+ if (!ipv6_addr_any(p))
+ return (const void *) p;
+ return daddr;
+}
+
+static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr)
+{
+ struct rt6_info *rt = (struct rt6_info *) dst;
+ struct neighbour *n;
+
+ daddr = choose_neigh_daddr(rt, daddr);
+ n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr);
+ if (n)
+ return n;
+ return neigh_create(&nd_tbl, daddr, dst->dev);
+}
+
+static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev)
+{
+ struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway);
+ if (!n) {
+ n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev);
+ if (IS_ERR(n))
+ return PTR_ERR(n);
+ }
+ dst_set_neighbour(&rt->dst, n);
+
+ return 0;
+}
+
+static struct dst_ops ip6_dst_ops_template = {
+ .family = AF_INET6,
+ .protocol = cpu_to_be16(ETH_P_IPV6),
+ .gc = ip6_dst_gc,
+ .gc_thresh = 1024,
+ .check = ip6_dst_check,
+ .default_advmss = ip6_default_advmss,
+ .mtu = ip6_mtu,
+ .cow_metrics = ipv6_cow_metrics,
+ .destroy = ip6_dst_destroy,
+ .ifdown = ip6_dst_ifdown,
+ .negative_advice = ip6_negative_advice,
+ .link_failure = ip6_link_failure,
+ .update_pmtu = ip6_rt_update_pmtu,
+ .local_out = __ip6_local_out,
+ .neigh_lookup = ip6_neigh_lookup,
+};
+
+static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
+{
+ unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
+
+ return mtu ? : dst->dev->mtu;
+}
+
+static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
+{
+}
+
+static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
+ unsigned long old)
+{
+ return NULL;
+}
+
+static struct dst_ops ip6_dst_blackhole_ops = {
+ .family = AF_INET6,
+ .protocol = cpu_to_be16(ETH_P_IPV6),
+ .destroy = ip6_dst_destroy,
+ .check = ip6_dst_check,
+ .mtu = ip6_blackhole_mtu,
+ .default_advmss = ip6_default_advmss,
+ .update_pmtu = ip6_rt_blackhole_update_pmtu,
+ .cow_metrics = ip6_rt_blackhole_cow_metrics,
+ .neigh_lookup = ip6_neigh_lookup,
+};
+
+static const u32 ip6_template_metrics[RTAX_MAX] = {
+ [RTAX_HOPLIMIT - 1] = 0,
+};
+
+static struct rt6_info ip6_null_entry_template = {
+ .dst = {
+ .__refcnt = ATOMIC_INIT(1),
+ .__use = 1,
+ .obsolete = -1,
+ .error = -ENETUNREACH,
+ .input = ip6_pkt_discard,
+ .output = ip6_pkt_discard_out,
+ },
+ .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
+ .rt6i_protocol = RTPROT_KERNEL,
+ .rt6i_metric = ~(u32) 0,
+ .rt6i_ref = ATOMIC_INIT(1),
+};
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+
+static int ip6_pkt_prohibit(struct sk_buff *skb);
+static int ip6_pkt_prohibit_out(struct sk_buff *skb);
+
+static struct rt6_info ip6_prohibit_entry_template = {
+ .dst = {
+ .__refcnt = ATOMIC_INIT(1),
+ .__use = 1,
+ .obsolete = -1,
+ .error = -EACCES,
+ .input = ip6_pkt_prohibit,
+ .output = ip6_pkt_prohibit_out,
+ },
+ .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
+ .rt6i_protocol = RTPROT_KERNEL,
+ .rt6i_metric = ~(u32) 0,
+ .rt6i_ref = ATOMIC_INIT(1),
+};
+
+static struct rt6_info ip6_blk_hole_entry_template = {
+ .dst = {
+ .__refcnt = ATOMIC_INIT(1),
+ .__use = 1,
+ .obsolete = -1,
+ .error = -EINVAL,
+ .input = dst_discard,
+ .output = dst_discard,
+ },
+ .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
+ .rt6i_protocol = RTPROT_KERNEL,
+ .rt6i_metric = ~(u32) 0,
+ .rt6i_ref = ATOMIC_INIT(1),
+};
+
+#endif
+
+/* allocate dst with ip6_dst_ops */
+static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops,
+ struct net_device *dev,
+ int flags)
+{
+ struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags);
+
+ if (rt)
+ memset(&rt->rt6i_table, 0,
+ sizeof(*rt) - sizeof(struct dst_entry));
+
+ return rt;
+}
+
+static void ip6_dst_destroy(struct dst_entry *dst)
+{
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ struct inet6_dev *idev = rt->rt6i_idev;
+ struct inet_peer *peer = rt->rt6i_peer;
+
+ if (!(rt->dst.flags & DST_HOST))
+ dst_destroy_metrics_generic(dst);
+
+ if (idev) {
+ rt->rt6i_idev = NULL;
+ in6_dev_put(idev);
+ }
+
+ if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from)
+ dst_release(dst->from);
+
+ if (peer) {
+ rt->rt6i_peer = NULL;
+ inet_putpeer(peer);
+ }
+}
+
+static atomic_t __rt6_peer_genid = ATOMIC_INIT(0);
+
+u32 rt6_peer_genid(void)
+{
+ return atomic_read(&__rt6_peer_genid);
+}
+
+void rt6_bind_peer(struct rt6_info *rt, int create)
+{
+ struct inet_peer *peer;
+
+ peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create);
+ if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL)
+ inet_putpeer(peer);
+ else
+ rt->rt6i_peer_genid = rt6_peer_genid();
+}
+
+static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
+ int how)
+{
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ struct inet6_dev *idev = rt->rt6i_idev;
+ struct net_device *loopback_dev =
+ dev_net(dev)->loopback_dev;
+
+ if (dev != loopback_dev && idev && idev->dev == dev) {
+ struct inet6_dev *loopback_idev =
+ in6_dev_get(loopback_dev);
+ if (loopback_idev) {
+ rt->rt6i_idev = loopback_idev;
+ in6_dev_put(idev);
+ }
+ }
+}
+
+static __inline__ int rt6_check_expired(const struct rt6_info *rt)
+{
+ struct rt6_info *ort = NULL;
+
+ if (rt->rt6i_flags & RTF_EXPIRES) {
+ if (time_after(jiffies, rt->dst.expires))
+ return 1;
+ } else if (rt->dst.from) {
+ ort = (struct rt6_info *) rt->dst.from;
+ return (ort->rt6i_flags & RTF_EXPIRES) &&
+ time_after(jiffies, ort->dst.expires);
+ }
+ return 0;
+}
+
+static inline int rt6_need_strict(const struct in6_addr *daddr)
+{
+ return ipv6_addr_type(daddr) &
+ (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
+}
+
+/*
+ * Route lookup. Any table->tb6_lock is implied.
+ */
+
+static inline struct rt6_info *rt6_device_match(struct net *net,
+ struct rt6_info *rt,
+ const struct in6_addr *saddr,
+ int oif,
+ int flags)
+{
+ struct rt6_info *local = NULL;
+ struct rt6_info *sprt;
+
+ if (!oif && ipv6_addr_any(saddr))
+ goto out;
+
+ for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
+ struct net_device *dev = sprt->dst.dev;
+
+ if (oif) {
+ if (dev->ifindex == oif)
+ return sprt;
+ if (dev->flags & IFF_LOOPBACK) {
+ if (!sprt->rt6i_idev ||
+ sprt->rt6i_idev->dev->ifindex != oif) {
+ if (flags & RT6_LOOKUP_F_IFACE && oif)
+ continue;
+ if (local && (!oif ||
+ local->rt6i_idev->dev->ifindex == oif))
+ continue;
+ }
+ local = sprt;
+ }
+ } else {
+ if (ipv6_chk_addr(net, saddr, dev,
+ flags & RT6_LOOKUP_F_IFACE))
+ return sprt;
+ }
+ }
+
+ if (oif) {
+ if (local)
+ return local;
+
+ if (flags & RT6_LOOKUP_F_IFACE)
+ return net->ipv6.ip6_null_entry;
+ }
+out:
+ return rt;
+}
+
+#ifdef CONFIG_IPV6_ROUTER_PREF
+static void rt6_probe(struct rt6_info *rt)
+{
+ struct neighbour *neigh;
+ /*
+ * Okay, this does not seem to be appropriate
+ * for now, however, we need to check if it
+ * is really so; aka Router Reachability Probing.
+ *
+ * Router Reachability Probe MUST be rate-limited
+ * to no more than one per minute.
+ */
+ rcu_read_lock();
+ neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL;
+ if (!neigh || (neigh->nud_state & NUD_VALID))
+ goto out;
+ read_lock_bh(&neigh->lock);
+ if (!(neigh->nud_state & NUD_VALID) &&
+ time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
+ struct in6_addr mcaddr;
+ struct in6_addr *target;
+
+ neigh->updated = jiffies;
+ read_unlock_bh(&neigh->lock);
+
+ target = (struct in6_addr *)&neigh->primary_key;
+ addrconf_addr_solict_mult(target, &mcaddr);
+ ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL);
+ } else {
+ read_unlock_bh(&neigh->lock);
+ }
+out:
+ rcu_read_unlock();
+}
+#else
+static inline void rt6_probe(struct rt6_info *rt)
+{
+}
+#endif
+
+/*
+ * Default Router Selection (RFC 2461 6.3.6)
+ */
+static inline int rt6_check_dev(struct rt6_info *rt, int oif)
+{
+ struct net_device *dev = rt->dst.dev;
+ if (!oif || dev->ifindex == oif)
+ return 2;
+ if ((dev->flags & IFF_LOOPBACK) &&
+ rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
+ return 1;
+ return 0;
+}
+
+static inline int rt6_check_neigh(struct rt6_info *rt)
+{
+ struct neighbour *neigh;
+ int m;
+
+ rcu_read_lock();
+ neigh = dst_get_neighbour_noref(&rt->dst);
+ if (rt->rt6i_flags & RTF_NONEXTHOP ||
+ !(rt->rt6i_flags & RTF_GATEWAY))
+ m = 1;
+ else if (neigh) {
+ read_lock_bh(&neigh->lock);
+ if (neigh->nud_state & NUD_VALID)
+ m = 2;
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ else if (neigh->nud_state & NUD_FAILED)
+ m = 0;
+#endif
+ else
+ m = 1;
+ read_unlock_bh(&neigh->lock);
+ } else
+ m = 0;
+ rcu_read_unlock();
+ return m;
+}
+
+static int rt6_score_route(struct rt6_info *rt, int oif,
+ int strict)
+{
+ int m, n;
+
+ m = rt6_check_dev(rt, oif);
+ if (!m && (strict & RT6_LOOKUP_F_IFACE))
+ return -1;
+#ifdef CONFIG_IPV6_ROUTER_PREF
+ m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
+#endif
+ n = rt6_check_neigh(rt);
+ if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
+ return -1;
+ return m;
+}
+
+static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
+ int *mpri, struct rt6_info *match)
+{
+ int m;
+
+ if (rt6_check_expired(rt))
+ goto out;
+
+ m = rt6_score_route(rt, oif, strict);
+ if (m < 0)
+ goto out;
+
+ if (m > *mpri) {
+ if (strict & RT6_LOOKUP_F_REACHABLE)
+ rt6_probe(match);
+ *mpri = m;
+ match = rt;
+ } else if (strict & RT6_LOOKUP_F_REACHABLE) {
+ rt6_probe(rt);
+ }
+
+out:
+ return match;
+}
+
+static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
+ struct rt6_info *rr_head,
+ u32 metric, int oif, int strict)
+{
+ struct rt6_info *rt, *match;
+ int mpri = -1;
+
+ match = NULL;
+ for (rt = rr_head; rt && rt->rt6i_metric == metric;
+ rt = rt->dst.rt6_next)
+ match = find_match(rt, oif, strict, &mpri, match);
+ for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
+ rt = rt->dst.rt6_next)
+ match = find_match(rt, oif, strict, &mpri, match);
+
+ return match;
+}
+
+static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
+{
+ struct rt6_info *match, *rt0;
+ struct net *net;
+
+ rt0 = fn->rr_ptr;
+ if (!rt0)
+ fn->rr_ptr = rt0 = fn->leaf;
+
+ match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
+
+ if (!match &&
+ (strict & RT6_LOOKUP_F_REACHABLE)) {
+ struct rt6_info *next = rt0->dst.rt6_next;
+
+ /* no entries matched; do round-robin */
+ if (!next || next->rt6i_metric != rt0->rt6i_metric)
+ next = fn->leaf;
+
+ if (next != rt0)
+ fn->rr_ptr = next;
+ }
+
+ net = dev_net(rt0->dst.dev);
+ return match ? match : net->ipv6.ip6_null_entry;
+}
+
+#ifdef CONFIG_IPV6_ROUTE_INFO
+int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
+ const struct in6_addr *gwaddr)
+{
+ struct net *net = dev_net(dev);
+ struct route_info *rinfo = (struct route_info *) opt;
+ struct in6_addr prefix_buf, *prefix;
+ unsigned int pref;
+ unsigned long lifetime;
+ struct rt6_info *rt;
+
+ if (len < sizeof(struct route_info)) {
+ return -EINVAL;
+ }
+
+ /* Sanity check for prefix_len and length */
+ if (rinfo->length > 3) {
+ return -EINVAL;
+ } else if (rinfo->prefix_len > 128) {
+ return -EINVAL;
+ } else if (rinfo->prefix_len > 64) {
+ if (rinfo->length < 2) {
+ return -EINVAL;
+ }
+ } else if (rinfo->prefix_len > 0) {
+ if (rinfo->length < 1) {
+ return -EINVAL;
+ }
+ }
+
+ pref = rinfo->route_pref;
+ if (pref == ICMPV6_ROUTER_PREF_INVALID)
+ return -EINVAL;
+
+ lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
+
+ if (rinfo->length == 3)
+ prefix = (struct in6_addr *)rinfo->prefix;
+ else {
+ /* this function is safe */
+ ipv6_addr_prefix(&prefix_buf,
+ (struct in6_addr *)rinfo->prefix,
+ rinfo->prefix_len);
+ prefix = &prefix_buf;
+ }
+
+ if (rinfo->prefix_len == 0)
+ rt = rt6_get_dflt_router(gwaddr, dev);
+ else
+ rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
+ gwaddr, dev->ifindex);
+
+ if (rt && !lifetime) {
+ ip6_del_rt(rt);
+ rt = NULL;
+ }
+
+ if (!rt && lifetime)
+ rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
+ pref);
+ else if (rt)
+ rt->rt6i_flags = RTF_ROUTEINFO |
+ (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
+
+ if (rt) {
+ if (!addrconf_finite_timeout(lifetime))
+ rt6_clean_expires(rt);
+ else
+ rt6_set_expires(rt, jiffies + HZ * lifetime);
+
+ dst_release(&rt->dst);
+ }
+ return 0;
+}
+#endif
+
+#define BACKTRACK(__net, saddr) \
+do { \
+ if (rt == __net->ipv6.ip6_null_entry) { \
+ struct fib6_node *pn; \
+ while (1) { \
+ if (fn->fn_flags & RTN_TL_ROOT) \
+ goto out; \
+ pn = fn->parent; \
+ if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
+ fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
+ else \
+ fn = pn; \
+ if (fn->fn_flags & RTN_RTINFO) \
+ goto restart; \
+ } \
+ } \
+} while (0)
+
+static struct rt6_info *ip6_pol_route_lookup(struct net *net,
+ struct fib6_table *table,
+ struct flowi6 *fl6, int flags)
+{
+ struct fib6_node *fn;
+ struct rt6_info *rt;
+
+ read_lock_bh(&table->tb6_lock);
+ fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
+restart:
+ rt = fn->leaf;
+ rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
+ BACKTRACK(net, &fl6->saddr);
+out:
+ dst_use(&rt->dst, jiffies);
+ read_unlock_bh(&table->tb6_lock);
+ return rt;
+
+}
+
+struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
+ int flags)
+{
+ return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
+}
+EXPORT_SYMBOL_GPL(ip6_route_lookup);
+
+struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
+ const struct in6_addr *saddr, int oif, int strict)
+{
+ struct flowi6 fl6 = {
+ .flowi6_oif = oif,
+ .daddr = *daddr,
+ };
+ struct dst_entry *dst;
+ int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
+
+ if (saddr) {
+ memcpy(&fl6.saddr, saddr, sizeof(*saddr));
+ flags |= RT6_LOOKUP_F_HAS_SADDR;
+ }
+
+ dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
+ if (dst->error == 0)
+ return (struct rt6_info *) dst;
+
+ dst_release(dst);
+
+ return NULL;
+}
+
+EXPORT_SYMBOL(rt6_lookup);
+
+/* ip6_ins_rt is called with FREE table->tb6_lock.
+ It takes new route entry, the addition fails by any reason the
+ route is freed. In any case, if caller does not hold it, it may
+ be destroyed.
+ */
+
+static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
+{
+ int err;
+ struct fib6_table *table;
+
+ table = rt->rt6i_table;
+ write_lock_bh(&table->tb6_lock);
+ err = fib6_add(&table->tb6_root, rt, info);
+ write_unlock_bh(&table->tb6_lock);
+
+ return err;
+}
+
+int ip6_ins_rt(struct rt6_info *rt)
+{
+ struct nl_info info = {
+ .nl_net = dev_net(rt->dst.dev),
+ };
+ return __ip6_ins_rt(rt, &info);
+}
+
+static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
+{
+ struct rt6_info *rt;
+
+ /*
+ * Clone the route.
+ */
+
+ rt = ip6_rt_copy(ort, daddr);
+
+ if (rt) {
+ int attempts = !in_softirq();
+
+ if (!(rt->rt6i_flags & RTF_GATEWAY)) {
+ if (ort->rt6i_dst.plen != 128 &&
+ ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
+ rt->rt6i_flags |= RTF_ANYCAST;
+ rt->rt6i_gateway = *daddr;
+ }
+
+ rt->rt6i_flags |= RTF_CACHE;
+
+#ifdef CONFIG_IPV6_SUBTREES
+ if (rt->rt6i_src.plen && saddr) {
+ rt->rt6i_src.addr = *saddr;
+ rt->rt6i_src.plen = 128;
+ }
+#endif
+
+ retry:
+ if (rt6_bind_neighbour(rt, rt->dst.dev)) {
+ struct net *net = dev_net(rt->dst.dev);
+ int saved_rt_min_interval =
+ net->ipv6.sysctl.ip6_rt_gc_min_interval;
+ int saved_rt_elasticity =
+ net->ipv6.sysctl.ip6_rt_gc_elasticity;
+
+ if (attempts-- > 0) {
+ net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
+ net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;
+
+ ip6_dst_gc(&net->ipv6.ip6_dst_ops);
+
+ net->ipv6.sysctl.ip6_rt_gc_elasticity =
+ saved_rt_elasticity;
+ net->ipv6.sysctl.ip6_rt_gc_min_interval =
+ saved_rt_min_interval;
+ goto retry;
+ }
+
+ if (net_ratelimit())
+ printk(KERN_WARNING
+ "ipv6: Neighbour table overflow.\n");
+ dst_free(&rt->dst);
+ return NULL;
+ }
+ }
+
+ return rt;
+}
+
+static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
+ const struct in6_addr *daddr)
+{
+ struct rt6_info *rt = ip6_rt_copy(ort, daddr);
+
+ if (rt) {
+ rt->rt6i_flags |= RTF_CACHE;
+ dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst)));
+ }
+ return rt;
+}
+
+static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
+ struct flowi6 *fl6, int flags, bool input)
+{
+ struct fib6_node *fn;
+ struct rt6_info *rt, *nrt;
+ int strict = 0;
+ int attempts = 3;
+ int err;
+ int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
+ int local = RTF_NONEXTHOP;
+
+ strict |= flags & RT6_LOOKUP_F_IFACE;
+ if (input)
+ local |= RTF_LOCAL;
+
+relookup:
+ read_lock_bh(&table->tb6_lock);
+
+restart_2:
+ fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
+
+restart:
+ rt = rt6_select(fn, oif, strict | reachable);
+
+ BACKTRACK(net, &fl6->saddr);
+ if (rt == net->ipv6.ip6_null_entry ||
+ rt->rt6i_flags & RTF_CACHE)
+ goto out;
+
+ dst_hold(&rt->dst);
+ read_unlock_bh(&table->tb6_lock);
+
+ if (!dst_get_neighbour_noref_raw(&rt->dst) &&
+ !(rt->rt6i_flags & local))
+ nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
+ else if (!(rt->dst.flags & DST_HOST))
+ nrt = rt6_alloc_clone(rt, &fl6->daddr);
+ else
+ goto out2;
+
+ dst_release(&rt->dst);
+ rt = nrt ? : net->ipv6.ip6_null_entry;
+
+ dst_hold(&rt->dst);
+ if (nrt) {
+ err = ip6_ins_rt(nrt);
+ if (!err)
+ goto out2;
+ }
+
+ if (--attempts <= 0)
+ goto out2;
+
+ /*
+ * Race condition! In the gap, when table->tb6_lock was
+ * released someone could insert this route. Relookup.
+ */
+ dst_release(&rt->dst);
+ goto relookup;
+
+out:
+ if (reachable) {
+ reachable = 0;
+ goto restart_2;
+ }
+ dst_hold(&rt->dst);
+ read_unlock_bh(&table->tb6_lock);
+out2:
+ rt->dst.lastuse = jiffies;
+ rt->dst.__use++;
+
+ return rt;
+}
+
+static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
+ struct flowi6 *fl6, int flags)
+{
+ return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags, true);
+}
+
+static struct dst_entry *ip6_route_input_lookup(struct net *net,
+ struct net_device *dev,
+ struct flowi6 *fl6, int flags)
+{
+ if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
+ flags |= RT6_LOOKUP_F_IFACE;
+
+ return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
+}
+
+void ip6_route_input(struct sk_buff *skb)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct net *net = dev_net(skb->dev);
+ int flags = RT6_LOOKUP_F_HAS_SADDR;
+ struct flowi6 fl6 = {
+ .flowi6_iif = skb->dev->ifindex,
+ .daddr = iph->daddr,
+ .saddr = iph->saddr,
+ .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK,
+ .flowi6_mark = skb->mark,
+ .flowi6_proto = iph->nexthdr,
+ };
+
+ skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
+}
+
+static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
+ struct flowi6 *fl6, int flags)
+{
+ return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags, false);
+}
+
+struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
+ struct flowi6 *fl6)
+{
+ int flags = 0;
+
+ if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
+ flags |= RT6_LOOKUP_F_IFACE;
+
+ if (!ipv6_addr_any(&fl6->saddr))
+ flags |= RT6_LOOKUP_F_HAS_SADDR;
+ else if (sk)
+ flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
+
+ return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
+}
+
+EXPORT_SYMBOL(ip6_route_output);
+
+struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
+{
+ struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
+ struct dst_entry *new = NULL;
+
+ rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0);
+ if (rt) {
+ memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry));
+
+ new = &rt->dst;
+
+ new->__use = 1;
+ new->input = dst_discard;
+ new->output = dst_discard;
+
+ if (dst_metrics_read_only(&ort->dst))
+ new->_metrics = ort->dst._metrics;
+ else
+ dst_copy_metrics(new, &ort->dst);
+ rt->rt6i_idev = ort->rt6i_idev;
+ if (rt->rt6i_idev)
+ in6_dev_hold(rt->rt6i_idev);
+
+ rt->rt6i_gateway = ort->rt6i_gateway;
+ rt->rt6i_flags = ort->rt6i_flags;
+ rt6_clean_expires(rt);
+ rt->rt6i_metric = 0;
+
+ memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
+#ifdef CONFIG_IPV6_SUBTREES
+ memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
+#endif
+
+ dst_free(new);
+ }
+
+ dst_release(dst_orig);
+ return new ? new : ERR_PTR(-ENOMEM);
+}
+
+/*
+ * Destination cache support functions
+ */
+
+static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
+{
+ struct rt6_info *rt;
+
+ rt = (struct rt6_info *) dst;
+
+ if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) {
+ if (rt->rt6i_peer_genid != rt6_peer_genid()) {
+ if (!rt->rt6i_peer)
+ rt6_bind_peer(rt, 0);
+ rt->rt6i_peer_genid = rt6_peer_genid();
+ }
+ return dst;
+ }
+ return NULL;
+}
+
+static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
+{
+ struct rt6_info *rt = (struct rt6_info *) dst;
+
+ if (rt) {
+ if (rt->rt6i_flags & RTF_CACHE) {
+ if (rt6_check_expired(rt)) {
+ ip6_del_rt(rt);
+ dst = NULL;
+ }
+ } else {
+ dst_release(dst);
+ dst = NULL;
+ }
+ }
+ return dst;
+}
+
+static void ip6_link_failure(struct sk_buff *skb)
+{
+ struct rt6_info *rt;
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
+
+ rt = (struct rt6_info *) skb_dst(skb);
+ if (rt) {
+ if (rt->rt6i_flags & RTF_CACHE) {
+ dst_hold(&rt->dst);
+ if (ip6_del_rt(rt))
+ dst_free(&rt->dst);
+ } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
+ rt->rt6i_node->fn_sernum = -1;
+ }
+ }
+}
+
+static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
+{
+ struct rt6_info *rt6 = (struct rt6_info*)dst;
+
+ if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
+ rt6->rt6i_flags |= RTF_MODIFIED;
+ if (mtu < IPV6_MIN_MTU) {
+ u32 features = dst_metric(dst, RTAX_FEATURES);
+ mtu = IPV6_MIN_MTU;
+ features |= RTAX_FEATURE_ALLFRAG;
+ dst_metric_set(dst, RTAX_FEATURES, features);
+ }
+ dst_metric_set(dst, RTAX_MTU, mtu);
+ }
+}
+
+static unsigned int ip6_default_advmss(const struct dst_entry *dst)
+{
+ struct net_device *dev = dst->dev;
+ unsigned int mtu = dst_mtu(dst);
+ struct net *net = dev_net(dev);
+
+ mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
+
+ if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
+ mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
+
+ /*
+ * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
+ * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
+ * IPV6_MAXPLEN is also valid and means: "any MSS,
+ * rely only on pmtu discovery"
+ */
+ if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
+ mtu = IPV6_MAXPLEN;
+ return mtu;
+}
+
+static unsigned int ip6_mtu(const struct dst_entry *dst)
+{
+ struct inet6_dev *idev;
+ unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
+
+ if (mtu)
+ goto out;
+
+ mtu = IPV6_MIN_MTU;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dst->dev);
+ if (idev)
+ mtu = idev->cnf.mtu6;
+ rcu_read_unlock();
+
+out:
+ return min_t(unsigned int, mtu, IP6_MAX_MTU);
+}
+
+static struct dst_entry *icmp6_dst_gc_list;
+static DEFINE_SPINLOCK(icmp6_dst_lock);
+
+struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
+ struct neighbour *neigh,
+ struct flowi6 *fl6)
+{
+ struct dst_entry *dst;
+ struct rt6_info *rt;
+ struct inet6_dev *idev = in6_dev_get(dev);
+ struct net *net = dev_net(dev);
+
+ if (unlikely(!idev))
+ return ERR_PTR(-ENODEV);
+
+ rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0);
+ if (unlikely(!rt)) {
+ in6_dev_put(idev);
+ dst = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ if (neigh)
+ neigh_hold(neigh);
+ else {
+ neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr);
+ if (IS_ERR(neigh)) {
+ in6_dev_put(idev);
+ dst_free(&rt->dst);
+ return ERR_CAST(neigh);
+ }
+ }
+
+ rt->dst.flags |= DST_HOST;
+ rt->dst.output = ip6_output;
+ dst_set_neighbour(&rt->dst, neigh);
+ atomic_set(&rt->dst.__refcnt, 1);
+ rt->rt6i_dst.addr = fl6->daddr;
+ rt->rt6i_dst.plen = 128;
+ rt->rt6i_idev = idev;
+ dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
+
+ spin_lock_bh(&icmp6_dst_lock);
+ rt->dst.next = icmp6_dst_gc_list;
+ icmp6_dst_gc_list = &rt->dst;
+ spin_unlock_bh(&icmp6_dst_lock);
+
+ fib6_force_start_gc(net);
+
+ dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
+
+out:
+ return dst;
+}
+
+int icmp6_dst_gc(void)
+{
+ struct dst_entry *dst, **pprev;
+ int more = 0;
+
+ spin_lock_bh(&icmp6_dst_lock);
+ pprev = &icmp6_dst_gc_list;
+
+ while ((dst = *pprev) != NULL) {
+ if (!atomic_read(&dst->__refcnt)) {
+ *pprev = dst->next;
+ dst_free(dst);
+ } else {
+ pprev = &dst->next;
+ ++more;
+ }
+ }
+
+ spin_unlock_bh(&icmp6_dst_lock);
+
+ return more;
+}
+
+static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
+ void *arg)
+{
+ struct dst_entry *dst, **pprev;
+
+ spin_lock_bh(&icmp6_dst_lock);
+ pprev = &icmp6_dst_gc_list;
+ while ((dst = *pprev) != NULL) {
+ struct rt6_info *rt = (struct rt6_info *) dst;
+ if (func(rt, arg)) {
+ *pprev = dst->next;
+ dst_free(dst);
+ } else {
+ pprev = &dst->next;
+ }
+ }
+ spin_unlock_bh(&icmp6_dst_lock);
+}
+
+static int ip6_dst_gc(struct dst_ops *ops)
+{
+ unsigned long now = jiffies;
+ struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
+ int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
+ int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
+ int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
+ int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
+ unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
+ int entries;
+
+ entries = dst_entries_get_fast(ops);
+ if (time_after(rt_last_gc + rt_min_interval, now) &&
+ entries <= rt_max_size)
+ goto out;
+
+ net->ipv6.ip6_rt_gc_expire++;
+ fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
+ net->ipv6.ip6_rt_last_gc = now;
+ entries = dst_entries_get_slow(ops);
+ if (entries < ops->gc_thresh)
+ net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
+out:
+ net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
+ return entries > rt_max_size;
+}
+
+/* Clean host part of a prefix. Not necessary in radix tree,
+ but results in cleaner routing tables.
+
+ Remove it only when all the things will work!
+ */
+
+int ip6_dst_hoplimit(struct dst_entry *dst)
+{
+ int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
+ if (hoplimit == 0) {
+ struct net_device *dev = dst->dev;
+ struct inet6_dev *idev;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(dev);
+ if (idev)
+ hoplimit = idev->cnf.hop_limit;
+ else
+ hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
+ rcu_read_unlock();
+ }
+ return hoplimit;
+}
+EXPORT_SYMBOL(ip6_dst_hoplimit);
+
+/*
+ *
+ */
+
+int ip6_route_add(struct fib6_config *cfg)
+{
+ int err;
+ struct net *net = cfg->fc_nlinfo.nl_net;
+ struct rt6_info *rt = NULL;
+ struct net_device *dev = NULL;
+ struct inet6_dev *idev = NULL;
+ struct fib6_table *table;
+ int addr_type;
+
+ if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
+ return -EINVAL;
+#ifndef CONFIG_IPV6_SUBTREES
+ if (cfg->fc_src_len)
+ return -EINVAL;
+#endif
+ if (cfg->fc_ifindex) {
+ err = -ENODEV;
+ dev = dev_get_by_index(net, cfg->fc_ifindex);
+ if (!dev)
+ goto out;
+ idev = in6_dev_get(dev);
+ if (!idev)
+ goto out;
+ }
+
+ if (cfg->fc_metric == 0)
+ cfg->fc_metric = IP6_RT_PRIO_USER;
+
+ err = -ENOBUFS;
+ if (cfg->fc_nlinfo.nlh &&
+ !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
+ table = fib6_get_table(net, cfg->fc_table);
+ if (!table) {
+ printk(KERN_WARNING "IPv6: NLM_F_CREATE should be specified when creating new route\n");
+ table = fib6_new_table(net, cfg->fc_table);
+ }
+ } else {
+ table = fib6_new_table(net, cfg->fc_table);
+ }
+
+ if (!table)
+ goto out;
+
+ rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
+
+ if (!rt) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ rt->dst.obsolete = -1;
+
+ if (cfg->fc_flags & RTF_EXPIRES)
+ rt6_set_expires(rt, jiffies +
+ clock_t_to_jiffies(cfg->fc_expires));
+ else
+ rt6_clean_expires(rt);
+
+ if (cfg->fc_protocol == RTPROT_UNSPEC)
+ cfg->fc_protocol = RTPROT_BOOT;
+ rt->rt6i_protocol = cfg->fc_protocol;
+
+ addr_type = ipv6_addr_type(&cfg->fc_dst);
+
+ if (addr_type & IPV6_ADDR_MULTICAST)
+ rt->dst.input = ip6_mc_input;
+ else if (cfg->fc_flags & RTF_LOCAL)
+ rt->dst.input = ip6_input;
+ else
+ rt->dst.input = ip6_forward;
+
+ rt->dst.output = ip6_output;
+
+ ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
+ rt->rt6i_dst.plen = cfg->fc_dst_len;
+ if (rt->rt6i_dst.plen == 128)
+ rt->dst.flags |= DST_HOST;
+
+ if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
+ u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
+ if (!metrics) {
+ err = -ENOMEM;
+ goto out;
+ }
+ dst_init_metrics(&rt->dst, metrics, 0);
+ }
+#ifdef CONFIG_IPV6_SUBTREES
+ ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
+ rt->rt6i_src.plen = cfg->fc_src_len;
+#endif
+
+ rt->rt6i_metric = cfg->fc_metric;
+
+ /* We cannot add true routes via loopback here,
+ they would result in kernel looping; promote them to reject routes
+ */
+ if ((cfg->fc_flags & RTF_REJECT) ||
+ (dev && (dev->flags & IFF_LOOPBACK) &&
+ !(addr_type & IPV6_ADDR_LOOPBACK) &&
+ !(cfg->fc_flags & RTF_LOCAL))) {
+ /* hold loopback dev/idev if we haven't done so. */
+ if (dev != net->loopback_dev) {
+ if (dev) {
+ dev_put(dev);
+ in6_dev_put(idev);
+ }
+ dev = net->loopback_dev;
+ dev_hold(dev);
+ idev = in6_dev_get(dev);
+ if (!idev) {
+ err = -ENODEV;
+ goto out;
+ }
+ }
+ rt->dst.output = ip6_pkt_discard_out;
+ rt->dst.input = ip6_pkt_discard;
+ rt->dst.error = -ENETUNREACH;
+ rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
+ goto install_route;
+ }
+
+ if (cfg->fc_flags & RTF_GATEWAY) {
+ const struct in6_addr *gw_addr;
+ int gwa_type;
+
+ gw_addr = &cfg->fc_gateway;
+ rt->rt6i_gateway = *gw_addr;
+ gwa_type = ipv6_addr_type(gw_addr);
+
+ if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
+ struct rt6_info *grt;
+
+ /* IPv6 strictly inhibits using not link-local
+ addresses as nexthop address.
+ Otherwise, router will not able to send redirects.
+ It is very good, but in some (rare!) circumstances
+ (SIT, PtP, NBMA NOARP links) it is handy to allow
+ some exceptions. --ANK
+ */
+ err = -EINVAL;
+ if (!(gwa_type & IPV6_ADDR_UNICAST))
+ goto out;
+
+ grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
+
+ err = -EHOSTUNREACH;
+ if (!grt)
+ goto out;
+ if (dev) {
+ if (dev != grt->dst.dev) {
+ dst_release(&grt->dst);
+ goto out;
+ }
+ } else {
+ dev = grt->dst.dev;
+ idev = grt->rt6i_idev;
+ dev_hold(dev);
+ in6_dev_hold(grt->rt6i_idev);
+ }
+ if (!(grt->rt6i_flags & RTF_GATEWAY))
+ err = 0;
+ dst_release(&grt->dst);
+
+ if (err)
+ goto out;
+ }
+ err = -EINVAL;
+ if (!dev || (dev->flags & IFF_LOOPBACK))
+ goto out;
+ }
+
+ err = -ENODEV;
+ if (!dev)
+ goto out;
+
+ if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
+ if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
+ err = -EINVAL;
+ goto out;
+ }
+ rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
+ rt->rt6i_prefsrc.plen = 128;
+ } else
+ rt->rt6i_prefsrc.plen = 0;
+
+ if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
+ err = rt6_bind_neighbour(rt, dev);
+ if (err)
+ goto out;
+ }
+
+ rt->rt6i_flags = cfg->fc_flags;
+
+install_route:
+ if (cfg->fc_mx) {
+ struct nlattr *nla;
+ int remaining;
+
+ nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
+ int type = nla_type(nla);
+
+ if (type) {
+ if (type > RTAX_MAX) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ dst_metric_set(&rt->dst, type, nla_get_u32(nla));
+ }
+ }
+ }
+
+ rt->dst.dev = dev;
+ rt->rt6i_idev = idev;
+ rt->rt6i_table = table;
+
+ cfg->fc_nlinfo.nl_net = dev_net(dev);
+
+ return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
+
+out:
+ if (dev)
+ dev_put(dev);
+ if (idev)
+ in6_dev_put(idev);
+ if (rt)
+ dst_free(&rt->dst);
+ return err;
+}
+
+static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
+{
+ int err;
+ struct fib6_table *table;
+ struct net *net = dev_net(rt->dst.dev);
+
+ if (rt == net->ipv6.ip6_null_entry) {
+ err = -ENOENT;
+ goto out;
+ }
+
+ table = rt->rt6i_table;
+ write_lock_bh(&table->tb6_lock);
+ err = fib6_del(rt, info);
+ write_unlock_bh(&table->tb6_lock);
+
+out:
+ dst_release(&rt->dst);
+ return err;
+}
+
+int ip6_del_rt(struct rt6_info *rt)
+{
+ struct nl_info info = {
+ .nl_net = dev_net(rt->dst.dev),
+ };
+ return __ip6_del_rt(rt, &info);
+}
+
+static int ip6_route_del(struct fib6_config *cfg)
+{
+ struct fib6_table *table;
+ struct fib6_node *fn;
+ struct rt6_info *rt;
+ int err = -ESRCH;
+
+ table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
+ if (!table)
+ return err;
+
+ read_lock_bh(&table->tb6_lock);
+
+ fn = fib6_locate(&table->tb6_root,
+ &cfg->fc_dst, cfg->fc_dst_len,
+ &cfg->fc_src, cfg->fc_src_len);
+
+ if (fn) {
+ for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
+ if (cfg->fc_ifindex &&
+ (!rt->dst.dev ||
+ rt->dst.dev->ifindex != cfg->fc_ifindex))
+ continue;
+ if (cfg->fc_flags & RTF_GATEWAY &&
+ !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
+ continue;
+ if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
+ continue;
+ dst_hold(&rt->dst);
+ read_unlock_bh(&table->tb6_lock);
+
+ return __ip6_del_rt(rt, &cfg->fc_nlinfo);
+ }
+ }
+ read_unlock_bh(&table->tb6_lock);
+
+ return err;
+}
+
+/*
+ * Handle redirects
+ */
+struct ip6rd_flowi {
+ struct flowi6 fl6;
+ struct in6_addr gateway;
+};
+
+static struct rt6_info *__ip6_route_redirect(struct net *net,
+ struct fib6_table *table,
+ struct flowi6 *fl6,
+ int flags)
+{
+ struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
+ struct rt6_info *rt;
+ struct fib6_node *fn;
+
+ /*
+ * Get the "current" route for this destination and
+ * check if the redirect has come from approriate router.
+ *
+ * RFC 2461 specifies that redirects should only be
+ * accepted if they come from the nexthop to the target.
+ * Due to the way the routes are chosen, this notion
+ * is a bit fuzzy and one might need to check all possible
+ * routes.
+ */
+
+ read_lock_bh(&table->tb6_lock);
+ fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
+restart:
+ for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
+ /*
+ * Current route is on-link; redirect is always invalid.
+ *
+ * Seems, previous statement is not true. It could
+ * be node, which looks for us as on-link (f.e. proxy ndisc)
+ * But then router serving it might decide, that we should
+ * know truth 8)8) --ANK (980726).
+ */
+ if (rt6_check_expired(rt))
+ continue;
+ if (!(rt->rt6i_flags & RTF_GATEWAY))
+ continue;
+ if (fl6->flowi6_oif != rt->dst.dev->ifindex)
+ continue;
+ if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
+ continue;
+ break;
+ }
+
+ if (!rt)
+ rt = net->ipv6.ip6_null_entry;
+ BACKTRACK(net, &fl6->saddr);
+out:
+ dst_hold(&rt->dst);
+
+ read_unlock_bh(&table->tb6_lock);
+
+ return rt;
+};
+
+static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest,
+ const struct in6_addr *src,
+ const struct in6_addr *gateway,
+ struct net_device *dev)
+{
+ int flags = RT6_LOOKUP_F_HAS_SADDR;
+ struct net *net = dev_net(dev);
+ struct ip6rd_flowi rdfl = {
+ .fl6 = {
+ .flowi6_oif = dev->ifindex,
+ .daddr = *dest,
+ .saddr = *src,
+ },
+ };
+
+ rdfl.gateway = *gateway;
+
+ if (rt6_need_strict(dest))
+ flags |= RT6_LOOKUP_F_IFACE;
+
+ return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6,
+ flags, __ip6_route_redirect);
+}
+
+void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src,
+ const struct in6_addr *saddr,
+ struct neighbour *neigh, u8 *lladdr, int on_link)
+{
+ struct rt6_info *rt, *nrt = NULL;
+ struct netevent_redirect netevent;
+ struct net *net = dev_net(neigh->dev);
+
+ rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
+
+ if (rt == net->ipv6.ip6_null_entry) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
+ "for redirect target\n");
+ goto out;
+ }
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ if (rt == net->ipv6.ip6_blk_hole_entry ||
+ rt == net->ipv6.ip6_prohibit_entry) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "rt6_redirect: source isn't a valid" \
+ " nexthop for redirect target " \
+ "(blackhole or prohibited)\n");
+ goto out;
+ }
+#endif
+
+ /*
+ * We have finally decided to accept it.
+ */
+
+ neigh_update(neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE|
+ (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
+ NEIGH_UPDATE_F_ISROUTER))
+ );
+
+ /*
+ * Redirect received -> path was valid.
+ * Look, redirects are sent only in response to data packets,
+ * so that this nexthop apparently is reachable. --ANK
+ */
+ dst_confirm(&rt->dst);
+
+ /* Duplicate redirect: silently ignore. */
+ if (neigh == dst_get_neighbour_noref_raw(&rt->dst))
+ goto out;
+
+ nrt = ip6_rt_copy(rt, dest);
+ if (!nrt)
+ goto out;
+
+ nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
+ if (on_link)
+ nrt->rt6i_flags &= ~RTF_GATEWAY;
+
+ nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
+ dst_set_neighbour(&nrt->dst, neigh_clone(neigh));
+
+ if (ip6_ins_rt(nrt))
+ goto out;
+
+ netevent.old = &rt->dst;
+ netevent.new = &nrt->dst;
+ call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
+
+ if (rt->rt6i_flags & RTF_CACHE) {
+ ip6_del_rt(rt);
+ return;
+ }
+
+out:
+ dst_release(&rt->dst);
+}
+
+/*
+ * Handle ICMP "packet too big" messages
+ * i.e. Path MTU discovery
+ */
+
+static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr,
+ struct net *net, u32 pmtu, int ifindex)
+{
+ struct rt6_info *rt, *nrt;
+ int allfrag = 0;
+again:
+ rt = rt6_lookup(net, daddr, saddr, ifindex, 0);
+ if (!rt)
+ return;
+
+ if (rt6_check_expired(rt)) {
+ ip6_del_rt(rt);
+ goto again;
+ }
+
+ if (pmtu >= dst_mtu(&rt->dst))
+ goto out;
+
+ if (pmtu < IPV6_MIN_MTU) {
+ /*
+ * According to RFC2460, PMTU is set to the IPv6 Minimum Link
+ * MTU (1280) and a fragment header should always be included
+ * after a node receiving Too Big message reporting PMTU is
+ * less than the IPv6 Minimum Link MTU.
+ */
+ pmtu = IPV6_MIN_MTU;
+ allfrag = 1;
+ }
+
+ /* New mtu received -> path was valid.
+ They are sent only in response to data packets,
+ so that this nexthop apparently is reachable. --ANK
+ */
+ dst_confirm(&rt->dst);
+
+ /* Host route. If it is static, it would be better
+ not to override it, but add new one, so that
+ when cache entry will expire old pmtu
+ would return automatically.
+ */
+ if (rt->rt6i_flags & RTF_CACHE) {
+ dst_metric_set(&rt->dst, RTAX_MTU, pmtu);
+ if (allfrag) {
+ u32 features = dst_metric(&rt->dst, RTAX_FEATURES);
+ features |= RTAX_FEATURE_ALLFRAG;
+ dst_metric_set(&rt->dst, RTAX_FEATURES, features);
+ }
+ rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
+ rt->rt6i_flags |= RTF_MODIFIED;
+ goto out;
+ }
+
+ /* Network route.
+ Two cases are possible:
+ 1. It is connected route. Action: COW
+ 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
+ */
+ if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP))
+ nrt = rt6_alloc_cow(rt, daddr, saddr);
+ else
+ nrt = rt6_alloc_clone(rt, daddr);
+
+ if (nrt) {
+ dst_metric_set(&nrt->dst, RTAX_MTU, pmtu);
+ if (allfrag) {
+ u32 features = dst_metric(&nrt->dst, RTAX_FEATURES);
+ features |= RTAX_FEATURE_ALLFRAG;
+ dst_metric_set(&nrt->dst, RTAX_FEATURES, features);
+ }
+
+ /* According to RFC 1981, detecting PMTU increase shouldn't be
+ * happened within 5 mins, the recommended timer is 10 mins.
+ * Here this route expiration time is set to ip6_rt_mtu_expires
+ * which is 10 mins. After 10 mins the decreased pmtu is expired
+ * and detecting PMTU increase will be automatically happened.
+ */
+ rt6_update_expires(nrt, net->ipv6.sysctl.ip6_rt_mtu_expires);
+ nrt->rt6i_flags |= RTF_DYNAMIC;
+ ip6_ins_rt(nrt);
+ }
+out:
+ dst_release(&rt->dst);
+}
+
+void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr,
+ struct net_device *dev, u32 pmtu)
+{
+ struct net *net = dev_net(dev);
+
+ /*
+ * RFC 1981 states that a node "MUST reduce the size of the packets it
+ * is sending along the path" that caused the Packet Too Big message.
+ * Since it's not possible in the general case to determine which
+ * interface was used to send the original packet, we update the MTU
+ * on the interface that will be used to send future packets. We also
+ * update the MTU on the interface that received the Packet Too Big in
+ * case the original packet was forced out that interface with
+ * SO_BINDTODEVICE or similar. This is the next best thing to the
+ * correct behaviour, which would be to update the MTU on all
+ * interfaces.
+ */
+ rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0);
+ rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex);
+}
+
+/*
+ * Misc support functions
+ */
+
+static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
+ const struct in6_addr *dest)
+{
+ struct net *net = dev_net(ort->dst.dev);
+ struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
+ ort->dst.dev, 0);
+
+ if (rt) {
+ rt->dst.input = ort->dst.input;
+ rt->dst.output = ort->dst.output;
+ rt->dst.flags |= DST_HOST;
+
+ rt->rt6i_dst.addr = *dest;
+ rt->rt6i_dst.plen = 128;
+ dst_copy_metrics(&rt->dst, &ort->dst);
+ rt->dst.error = ort->dst.error;
+ rt->rt6i_idev = ort->rt6i_idev;
+ if (rt->rt6i_idev)
+ in6_dev_hold(rt->rt6i_idev);
+ rt->dst.lastuse = jiffies;
+
+ rt->rt6i_gateway = ort->rt6i_gateway;
+ rt->rt6i_flags = ort->rt6i_flags;
+ if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
+ (RTF_DEFAULT | RTF_ADDRCONF))
+ rt6_set_from(rt, ort);
+ else
+ rt6_clean_expires(rt);
+ rt->rt6i_metric = 0;
+
+#ifdef CONFIG_IPV6_SUBTREES
+ memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
+#endif
+ memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
+ rt->rt6i_table = ort->rt6i_table;
+ }
+ return rt;
+}
+
+#ifdef CONFIG_IPV6_ROUTE_INFO
+static struct rt6_info *rt6_get_route_info(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ const struct in6_addr *gwaddr, int ifindex)
+{
+ struct fib6_node *fn;
+ struct rt6_info *rt = NULL;
+ struct fib6_table *table;
+
+ table = fib6_get_table(net, RT6_TABLE_INFO);
+ if (!table)
+ return NULL;
+
+ write_lock_bh(&table->tb6_lock);
+ fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
+ if (!fn)
+ goto out;
+
+ for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
+ if (rt->dst.dev->ifindex != ifindex)
+ continue;
+ if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
+ continue;
+ if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
+ continue;
+ dst_hold(&rt->dst);
+ break;
+ }
+out:
+ write_unlock_bh(&table->tb6_lock);
+ return rt;
+}
+
+static struct rt6_info *rt6_add_route_info(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
+ const struct in6_addr *gwaddr, int ifindex,
+ unsigned pref)
+{
+ struct fib6_config cfg = {
+ .fc_table = RT6_TABLE_INFO,
+ .fc_metric = IP6_RT_PRIO_USER,
+ .fc_ifindex = ifindex,
+ .fc_dst_len = prefixlen,
+ .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
+ RTF_UP | RTF_PREF(pref),
+ .fc_nlinfo.pid = 0,
+ .fc_nlinfo.nlh = NULL,
+ .fc_nlinfo.nl_net = net,
+ };
+
+ cfg.fc_dst = *prefix;
+ cfg.fc_gateway = *gwaddr;
+
+ /* We should treat it as a default route if prefix length is 0. */
+ if (!prefixlen)
+ cfg.fc_flags |= RTF_DEFAULT;
+
+ ip6_route_add(&cfg);
+
+ return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
+}
+#endif
+
+struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
+{
+ struct rt6_info *rt;
+ struct fib6_table *table;
+
+ table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
+ if (!table)
+ return NULL;
+
+ write_lock_bh(&table->tb6_lock);
+ for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
+ if (dev == rt->dst.dev &&
+ ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
+ ipv6_addr_equal(&rt->rt6i_gateway, addr))
+ break;
+ }
+ if (rt)
+ dst_hold(&rt->dst);
+ write_unlock_bh(&table->tb6_lock);
+ return rt;
+}
+
+struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
+ struct net_device *dev,
+ unsigned int pref)
+{
+ struct fib6_config cfg = {
+ .fc_table = RT6_TABLE_DFLT,
+ .fc_metric = IP6_RT_PRIO_USER,
+ .fc_ifindex = dev->ifindex,
+ .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
+ RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
+ .fc_nlinfo.pid = 0,
+ .fc_nlinfo.nlh = NULL,
+ .fc_nlinfo.nl_net = dev_net(dev),
+ };
+
+ cfg.fc_gateway = *gwaddr;
+
+ ip6_route_add(&cfg);
+
+ return rt6_get_dflt_router(gwaddr, dev);
+}
+
+void rt6_purge_dflt_routers(struct net *net)
+{
+ struct rt6_info *rt;
+ struct fib6_table *table;
+
+ /* NOTE: Keep consistent with rt6_get_dflt_router */
+ table = fib6_get_table(net, RT6_TABLE_DFLT);
+ if (!table)
+ return;
+
+restart:
+ read_lock_bh(&table->tb6_lock);
+ for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
+ if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
+ (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
+ dst_hold(&rt->dst);
+ read_unlock_bh(&table->tb6_lock);
+ ip6_del_rt(rt);
+ goto restart;
+ }
+ }
+ read_unlock_bh(&table->tb6_lock);
+}
+
+static void rtmsg_to_fib6_config(struct net *net,
+ struct in6_rtmsg *rtmsg,
+ struct fib6_config *cfg)
+{
+ memset(cfg, 0, sizeof(*cfg));
+
+ cfg->fc_table = RT6_TABLE_MAIN;
+ cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
+ cfg->fc_metric = rtmsg->rtmsg_metric;
+ cfg->fc_expires = rtmsg->rtmsg_info;
+ cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
+ cfg->fc_src_len = rtmsg->rtmsg_src_len;
+ cfg->fc_flags = rtmsg->rtmsg_flags;
+
+ cfg->fc_nlinfo.nl_net = net;
+
+ cfg->fc_dst = rtmsg->rtmsg_dst;
+ cfg->fc_src = rtmsg->rtmsg_src;
+ cfg->fc_gateway = rtmsg->rtmsg_gateway;
+}
+
+int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
+{
+ struct fib6_config cfg;
+ struct in6_rtmsg rtmsg;
+ int err;
+
+ switch(cmd) {
+ case SIOCADDRT: /* Add a route */
+ case SIOCDELRT: /* Delete a route */
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+ err = copy_from_user(&rtmsg, arg,
+ sizeof(struct in6_rtmsg));
+ if (err)
+ return -EFAULT;
+
+ rtmsg_to_fib6_config(net, &rtmsg, &cfg);
+
+ rtnl_lock();
+ switch (cmd) {
+ case SIOCADDRT:
+ err = ip6_route_add(&cfg);
+ break;
+ case SIOCDELRT:
+ err = ip6_route_del(&cfg);
+ break;
+ default:
+ err = -EINVAL;
+ }
+ rtnl_unlock();
+
+ return err;
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * Drop the packet on the floor
+ */
+
+static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
+{
+ int type;
+ struct dst_entry *dst = skb_dst(skb);
+ switch (ipstats_mib_noroutes) {
+ case IPSTATS_MIB_INNOROUTES:
+ type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
+ if (type == IPV6_ADDR_ANY) {
+ IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
+ IPSTATS_MIB_INADDRERRORS);
+ break;
+ }
+ /* FALLTHROUGH */
+ case IPSTATS_MIB_OUTNOROUTES:
+ IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
+ ipstats_mib_noroutes);
+ break;
+ }
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
+ kfree_skb(skb);
+ return 0;
+}
+
+static int ip6_pkt_discard(struct sk_buff *skb)
+{
+ return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
+}
+
+static int ip6_pkt_discard_out(struct sk_buff *skb)
+{
+ skb->dev = skb_dst(skb)->dev;
+ return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
+}
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+
+static int ip6_pkt_prohibit(struct sk_buff *skb)
+{
+ return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
+}
+
+static int ip6_pkt_prohibit_out(struct sk_buff *skb)
+{
+ skb->dev = skb_dst(skb)->dev;
+ return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
+}
+
+#endif
+
+/*
+ * Allocate a dst for local (unicast / anycast) address.
+ */
+
+struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
+ const struct in6_addr *addr,
+ bool anycast)
+{
+ struct net *net = dev_net(idev->dev);
+ struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
+ net->loopback_dev, DST_NOCOUNT);
+ int err;
+
+ if (!rt)
+ return ERR_PTR(-ENOMEM);
+
+ in6_dev_hold(idev);
+
+ rt->dst.flags |= DST_HOST;
+ rt->dst.input = ip6_input;
+ rt->dst.output = ip6_output;
+ rt->rt6i_idev = idev;
+ rt->dst.obsolete = -1;
+
+ rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
+ if (anycast)
+ rt->rt6i_flags |= RTF_ANYCAST;
+ else
+ rt->rt6i_flags |= RTF_LOCAL;
+ err = rt6_bind_neighbour(rt, rt->dst.dev);
+ if (err) {
+ dst_free(&rt->dst);
+ return ERR_PTR(err);
+ }
+
+ rt->rt6i_dst.addr = *addr;
+ rt->rt6i_dst.plen = 128;
+ rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
+
+ atomic_set(&rt->dst.__refcnt, 1);
+
+ return rt;
+}
+
+int ip6_route_get_saddr(struct net *net,
+ struct rt6_info *rt,
+ const struct in6_addr *daddr,
+ unsigned int prefs,
+ struct in6_addr *saddr)
+{
+ struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
+ int err = 0;
+ if (rt->rt6i_prefsrc.plen)
+ *saddr = rt->rt6i_prefsrc.addr;
+ else
+ err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
+ daddr, prefs, saddr);
+ return err;
+}
+
+/* remove deleted ip from prefsrc entries */
+struct arg_dev_net_ip {
+ struct net_device *dev;
+ struct net *net;
+ struct in6_addr *addr;
+};
+
+static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
+{
+ struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
+ struct net *net = ((struct arg_dev_net_ip *)arg)->net;
+ struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
+
+ if (((void *)rt->dst.dev == dev || !dev) &&
+ rt != net->ipv6.ip6_null_entry &&
+ ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
+ /* remove prefsrc entry */
+ rt->rt6i_prefsrc.plen = 0;
+ }
+ return 0;
+}
+
+void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
+{
+ struct net *net = dev_net(ifp->idev->dev);
+ struct arg_dev_net_ip adni = {
+ .dev = ifp->idev->dev,
+ .net = net,
+ .addr = &ifp->addr,
+ };
+ fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
+}
+
+struct arg_dev_net {
+ struct net_device *dev;
+ struct net *net;
+};
+
+static int fib6_ifdown(struct rt6_info *rt, void *arg)
+{
+ const struct arg_dev_net *adn = arg;
+ const struct net_device *dev = adn->dev;
+
+ if ((rt->dst.dev == dev || !dev) &&
+ rt != adn->net->ipv6.ip6_null_entry)
+ return -1;
+
+ return 0;
+}
+
+void rt6_ifdown(struct net *net, struct net_device *dev)
+{
+ struct arg_dev_net adn = {
+ .dev = dev,
+ .net = net,
+ };
+
+ fib6_clean_all(net, fib6_ifdown, 0, &adn);
+ icmp6_clean_all(fib6_ifdown, &adn);
+}
+
+struct rt6_mtu_change_arg
+{
+ struct net_device *dev;
+ unsigned mtu;
+};
+
+static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
+{
+ struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
+ struct inet6_dev *idev;
+
+ /* In IPv6 pmtu discovery is not optional,
+ so that RTAX_MTU lock cannot disable it.
+ We still use this lock to block changes
+ caused by addrconf/ndisc.
+ */
+
+ idev = __in6_dev_get(arg->dev);
+ if (!idev)
+ return 0;
+
+ /* For administrative MTU increase, there is no way to discover
+ IPv6 PMTU increase, so PMTU increase should be updated here.
+ Since RFC 1981 doesn't include administrative MTU increase
+ update PMTU increase is a MUST. (i.e. jumbo frame)
+ */
+ /*
+ If new MTU is less than route PMTU, this new MTU will be the
+ lowest MTU in the path, update the route PMTU to reflect PMTU
+ decreases; if new MTU is greater than route PMTU, and the
+ old MTU is the lowest MTU in the path, update the route PMTU
+ to reflect the increase. In this case if the other nodes' MTU
+ also have the lowest MTU, TOO BIG MESSAGE will be lead to
+ PMTU discouvery.
+ */
+ if (rt->dst.dev == arg->dev &&
+ !dst_metric_locked(&rt->dst, RTAX_MTU) &&
+ (dst_mtu(&rt->dst) >= arg->mtu ||
+ (dst_mtu(&rt->dst) < arg->mtu &&
+ dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
+ dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
+ }
+ return 0;
+}
+
+void rt6_mtu_change(struct net_device *dev, unsigned mtu)
+{
+ struct rt6_mtu_change_arg arg = {
+ .dev = dev,
+ .mtu = mtu,
+ };
+
+ fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
+}
+
+static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
+ [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
+ [RTA_OIF] = { .type = NLA_U32 },
+ [RTA_IIF] = { .type = NLA_U32 },
+ [RTA_PRIORITY] = { .type = NLA_U32 },
+ [RTA_METRICS] = { .type = NLA_NESTED },
+};
+
+static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct fib6_config *cfg)
+{
+ struct rtmsg *rtm;
+ struct nlattr *tb[RTA_MAX+1];
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
+ if (err < 0)
+ goto errout;
+
+ err = -EINVAL;
+ rtm = nlmsg_data(nlh);
+ memset(cfg, 0, sizeof(*cfg));
+
+ cfg->fc_table = rtm->rtm_table;
+ cfg->fc_dst_len = rtm->rtm_dst_len;
+ cfg->fc_src_len = rtm->rtm_src_len;
+ cfg->fc_flags = RTF_UP;
+ cfg->fc_protocol = rtm->rtm_protocol;
+
+ if (rtm->rtm_type == RTN_UNREACHABLE)
+ cfg->fc_flags |= RTF_REJECT;
+
+ if (rtm->rtm_type == RTN_LOCAL)
+ cfg->fc_flags |= RTF_LOCAL;
+
+ cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
+ cfg->fc_nlinfo.nlh = nlh;
+ cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
+
+ if (tb[RTA_GATEWAY]) {
+ nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
+ cfg->fc_flags |= RTF_GATEWAY;
+ }
+
+ if (tb[RTA_DST]) {
+ int plen = (rtm->rtm_dst_len + 7) >> 3;
+
+ if (nla_len(tb[RTA_DST]) < plen)
+ goto errout;
+
+ nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
+ }
+
+ if (tb[RTA_SRC]) {
+ int plen = (rtm->rtm_src_len + 7) >> 3;
+
+ if (nla_len(tb[RTA_SRC]) < plen)
+ goto errout;
+
+ nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
+ }
+
+ if (tb[RTA_PREFSRC])
+ nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
+
+ if (tb[RTA_OIF])
+ cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
+
+ if (tb[RTA_PRIORITY])
+ cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
+
+ if (tb[RTA_METRICS]) {
+ cfg->fc_mx = nla_data(tb[RTA_METRICS]);
+ cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
+ }
+
+ if (tb[RTA_TABLE])
+ cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
+
+ err = 0;
+errout:
+ return err;
+}
+
+static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
+{
+ struct fib6_config cfg;
+ int err;
+
+ err = rtm_to_fib6_config(skb, nlh, &cfg);
+ if (err < 0)
+ return err;
+
+ return ip6_route_del(&cfg);
+}
+
+static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
+{
+ struct fib6_config cfg;
+ int err;
+
+ err = rtm_to_fib6_config(skb, nlh, &cfg);
+ if (err < 0)
+ return err;
+
+ return ip6_route_add(&cfg);
+}
+
+static inline size_t rt6_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct rtmsg))
+ + nla_total_size(16) /* RTA_SRC */
+ + nla_total_size(16) /* RTA_DST */
+ + nla_total_size(16) /* RTA_GATEWAY */
+ + nla_total_size(16) /* RTA_PREFSRC */
+ + nla_total_size(4) /* RTA_TABLE */
+ + nla_total_size(4) /* RTA_IIF */
+ + nla_total_size(4) /* RTA_OIF */
+ + nla_total_size(4) /* RTA_PRIORITY */
+ + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
+ + nla_total_size(sizeof(struct rta_cacheinfo));
+}
+
+static int rt6_fill_node(struct net *net,
+ struct sk_buff *skb, struct rt6_info *rt,
+ struct in6_addr *dst, struct in6_addr *src,
+ int iif, int type, u32 pid, u32 seq,
+ int prefix, int nowait, unsigned int flags)
+{
+ const struct inet_peer *peer;
+ struct rtmsg *rtm;
+ struct nlmsghdr *nlh;
+ long expires;
+ u32 table;
+ struct neighbour *n;
+ u32 ts, tsage;
+
+ if (prefix) { /* user wants prefix routes only */
+ if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
+ /* success since this is not a prefix route */
+ return 1;
+ }
+ }
+
+ nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ rtm = nlmsg_data(nlh);
+ rtm->rtm_family = AF_INET6;
+ rtm->rtm_dst_len = rt->rt6i_dst.plen;
+ rtm->rtm_src_len = rt->rt6i_src.plen;
+ rtm->rtm_tos = 0;
+ if (rt->rt6i_table)
+ table = rt->rt6i_table->tb6_id;
+ else
+ table = RT6_TABLE_UNSPEC;
+ rtm->rtm_table = table;
+ NLA_PUT_U32(skb, RTA_TABLE, table);
+ if (rt->rt6i_flags & RTF_REJECT)
+ rtm->rtm_type = RTN_UNREACHABLE;
+ else if (rt->rt6i_flags & RTF_LOCAL)
+ rtm->rtm_type = RTN_LOCAL;
+ else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
+ rtm->rtm_type = RTN_LOCAL;
+ else
+ rtm->rtm_type = RTN_UNICAST;
+ net_run_track(PRT_ROUTE,"route");
+ rtm->rtm_flags = 0;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ rtm->rtm_protocol = rt->rt6i_protocol;
+ if (rt->rt6i_flags & RTF_DYNAMIC)
+ rtm->rtm_protocol = RTPROT_REDIRECT;
+ else if (rt->rt6i_flags & RTF_ADDRCONF)
+ rtm->rtm_protocol = RTPROT_KERNEL;
+ else if (rt->rt6i_flags & RTF_DEFAULT)
+ rtm->rtm_protocol = RTPROT_RA;
+
+ if (rt->rt6i_flags & RTF_CACHE)
+ rtm->rtm_flags |= RTM_F_CLONED;
+
+ if (dst) {
+ NLA_PUT(skb, RTA_DST, 16, dst);
+ rtm->rtm_dst_len = 128;
+ } else if (rtm->rtm_dst_len)
+ NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
+#ifdef CONFIG_IPV6_SUBTREES
+ if (src) {
+ NLA_PUT(skb, RTA_SRC, 16, src);
+ rtm->rtm_src_len = 128;
+ } else if (rtm->rtm_src_len)
+ NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
+#endif
+ if (iif) {
+#ifdef CONFIG_IPV6_MROUTE
+ if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
+ int err = ip6mr_get_route(net, skb, rtm, nowait);
+ if (err <= 0) {
+ if (!nowait) {
+ if (err == 0)
+ return 0;
+ goto nla_put_failure;
+ } else {
+ if (err == -EMSGSIZE)
+ goto nla_put_failure;
+ }
+ }
+ } else
+#endif
+ NLA_PUT_U32(skb, RTA_IIF, iif);
+ } else if (dst) {
+ struct in6_addr saddr_buf;
+ if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0)
+ NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
+ }
+
+ if (rt->rt6i_prefsrc.plen) {
+ struct in6_addr saddr_buf;
+ saddr_buf = rt->rt6i_prefsrc.addr;
+ NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
+ }
+
+ if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
+ goto nla_put_failure;
+
+ rcu_read_lock();
+ n = dst_get_neighbour_noref(&rt->dst);
+ if (n) {
+ if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) {
+ rcu_read_unlock();
+ goto nla_put_failure;
+ }
+ }
+ rcu_read_unlock();
+
+ if (rt->dst.dev)
+ NLA_PUT_U32(skb, RTA_OIF, rt->dst.dev->ifindex);
+
+ NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
+
+ if (!(rt->rt6i_flags & RTF_EXPIRES))
+ expires = 0;
+ else if (rt->dst.expires - jiffies < INT_MAX)
+ expires = rt->dst.expires - jiffies;
+ else
+ expires = INT_MAX;
+
+ peer = rt->rt6i_peer;
+ ts = tsage = 0;
+ if (peer && peer->tcp_ts_stamp) {
+ ts = peer->tcp_ts;
+ tsage = get_seconds() - peer->tcp_ts_stamp;
+ }
+
+ if (rtnl_put_cacheinfo(skb, &rt->dst, 0, ts, tsage,
+ expires, rt->dst.error) < 0)
+ goto nla_put_failure;
+
+ return nlmsg_end(skb, nlh);
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+int rt6_dump_route(struct rt6_info *rt, void *p_arg)
+{
+ struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
+ int prefix;
+
+ if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
+ struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
+ prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
+ } else
+ prefix = 0;
+
+ return rt6_fill_node(arg->net,
+ arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
+ NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
+ prefix, 0, NLM_F_MULTI);
+}
+
+static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct nlattr *tb[RTA_MAX+1];
+ struct rt6_info *rt;
+ struct sk_buff *skb;
+ struct rtmsg *rtm;
+ struct flowi6 fl6;
+ int err, iif = 0, oif = 0;
+
+ err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
+ if (err < 0)
+ goto errout;
+
+ err = -EINVAL;
+ memset(&fl6, 0, sizeof(fl6));
+
+ if (tb[RTA_SRC]) {
+ if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
+ goto errout;
+
+ fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
+ }
+
+ if (tb[RTA_DST]) {
+ if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
+ goto errout;
+
+ fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
+ }
+
+ if (tb[RTA_IIF])
+ iif = nla_get_u32(tb[RTA_IIF]);
+
+ if (tb[RTA_OIF])
+ oif = nla_get_u32(tb[RTA_OIF]);
+
+ if (iif) {
+ struct net_device *dev;
+ int flags = 0;
+
+ dev = __dev_get_by_index(net, iif);
+ if (!dev) {
+ err = -ENODEV;
+ goto errout;
+ }
+
+ fl6.flowi6_iif = iif;
+
+ if (!ipv6_addr_any(&fl6.saddr))
+ flags |= RT6_LOOKUP_F_HAS_SADDR;
+
+ rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
+ flags);
+ } else {
+ fl6.flowi6_oif = oif;
+
+ rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
+ }
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!skb) {
+ err = -ENOBUFS;
+ goto errout;
+ }
+
+ /* Reserve room for dummy headers, this skb can pass
+ through good chunk of routing engine.
+ */
+ skb_reset_mac_header(skb);
+ skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
+
+ skb_dst_set(skb, &rt->dst);
+
+ err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
+ RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
+ nlh->nlmsg_seq, 0, 0, 0);
+ if (err < 0) {
+ kfree_skb(skb);
+ goto errout;
+ }
+
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
+errout:
+ return err;
+}
+
+void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
+{
+ struct sk_buff *skb;
+ struct net *net = info->nl_net;
+ u32 seq;
+ int err;
+
+ err = -ENOBUFS;
+ seq = info->nlh ? info->nlh->nlmsg_seq : 0;
+
+ skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
+ if (!skb)
+ goto errout;
+
+ err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
+ event, info->pid, seq, 0, 0, 0);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ //print_sun(SUN_LEARN,"dev:IPV6 ROUTE,inet6_rt_notify::rtnl_notify;type=%d,for example RTM_NEWNDUSEROPT",event);
+ rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
+ info->nlh, gfp_any());
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
+}
+
+static int ip6_route_dev_notify(struct notifier_block *this,
+ unsigned long event, void *data)
+{
+ struct net_device *dev = (struct net_device *)data;
+ struct net *net = dev_net(dev);
+
+ if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
+ net->ipv6.ip6_null_entry->dst.dev = dev;
+ net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ net->ipv6.ip6_prohibit_entry->dst.dev = dev;
+ net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
+ net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
+ net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
+#endif
+ }
+ //print_sun(SUN_LEARN,"dev:%s--notify:event=%d : NETDEV_REGISTER",dev->name,event);
+ return NOTIFY_OK;
+}
+
+/*
+ * /proc
+ */
+
+#ifdef CONFIG_PROC_FS
+
+struct rt6_proc_arg
+{
+ char *buffer;
+ int offset;
+ int length;
+ int skip;
+ int len;
+};
+
+static int rt6_info_route(struct rt6_info *rt, void *p_arg)
+{
+ struct seq_file *m = p_arg;
+ struct neighbour *n;
+
+ seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
+#else
+ seq_puts(m, "00000000000000000000000000000000 00 ");
+#endif
+ rcu_read_lock();
+ n = dst_get_neighbour_noref(&rt->dst);
+ if (n) {
+ seq_printf(m, "%pi6", n->primary_key);
+ } else {
+ seq_puts(m, "00000000000000000000000000000000");
+ }
+ rcu_read_unlock();
+ seq_printf(m, " %08x %08x %08x %08x %8s\n",
+ rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
+ rt->dst.__use, rt->rt6i_flags,
+ rt->dst.dev ? rt->dst.dev->name : "");
+ return 0;
+}
+
+static int ipv6_route_show(struct seq_file *m, void *v)
+{
+ struct net *net = (struct net *)m->private;
+ fib6_clean_all_ro(net, rt6_info_route, 0, m);
+ return 0;
+}
+
+static int ipv6_route_open(struct inode *inode, struct file *file)
+{
+ return single_open_net(inode, file, ipv6_route_show);
+}
+
+static const struct file_operations ipv6_route_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = ipv6_route_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release_net,
+};
+
+static int rt6_stats_seq_show(struct seq_file *seq, void *v)
+{
+ struct net *net = (struct net *)seq->private;
+ seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
+ net->ipv6.rt6_stats->fib_nodes,
+ net->ipv6.rt6_stats->fib_route_nodes,
+ net->ipv6.rt6_stats->fib_rt_alloc,
+ net->ipv6.rt6_stats->fib_rt_entries,
+ net->ipv6.rt6_stats->fib_rt_cache,
+ dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
+ net->ipv6.rt6_stats->fib_discarded_routes);
+
+ return 0;
+}
+
+static int rt6_stats_seq_open(struct inode *inode, struct file *file)
+{
+ return single_open_net(inode, file, rt6_stats_seq_show);
+}
+
+static const struct file_operations rt6_stats_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = rt6_stats_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release_net,
+};
+#endif /* CONFIG_PROC_FS */
+
+#ifdef CONFIG_SYSCTL
+
+static
+int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net *net;
+ int delay;
+ if (!write)
+ return -EINVAL;
+
+ net = (struct net *)ctl->extra1;
+ delay = net->ipv6.sysctl.flush_delay;
+ proc_dointvec(ctl, write, buffer, lenp, ppos);
+ fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
+ return 0;
+}
+
+ctl_table ipv6_route_table_template[] = {
+ {
+ .procname = "flush",
+ .data = &init_net.ipv6.sysctl.flush_delay,
+ .maxlen = sizeof(int),
+ .mode = 0200,
+ .proc_handler = ipv6_sysctl_rtcache_flush
+ },
+ {
+ .procname = "gc_thresh",
+ .data = &ip6_dst_ops_template.gc_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "max_size",
+ .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "gc_min_interval",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "gc_timeout",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "gc_interval",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "gc_elasticity",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "mtu_expires",
+ .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "min_adv_mss",
+ .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "gc_min_interval_ms",
+ .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ { }
+};
+
+struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
+{
+ struct ctl_table *table;
+
+ table = kmemdup(ipv6_route_table_template,
+ sizeof(ipv6_route_table_template),
+ GFP_KERNEL);
+
+ if (table) {
+ table[0].data = &net->ipv6.sysctl.flush_delay;
+ table[0].extra1 = net;
+ table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
+ table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
+ table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
+ table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
+ table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
+ table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
+ table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
+ table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
+ table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
+ }
+
+ return table;
+}
+#endif
+
+static int __net_init ip6_route_net_init(struct net *net)
+{
+ int ret = -ENOMEM;
+
+ memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
+ sizeof(net->ipv6.ip6_dst_ops));
+
+ if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
+ goto out_ip6_dst_ops;
+
+ net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
+ sizeof(*net->ipv6.ip6_null_entry),
+ GFP_KERNEL);
+ if (!net->ipv6.ip6_null_entry)
+ goto out_ip6_dst_entries;
+ net->ipv6.ip6_null_entry->dst.path =
+ (struct dst_entry *)net->ipv6.ip6_null_entry;
+ net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
+ dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
+ ip6_template_metrics, true);
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
+ sizeof(*net->ipv6.ip6_prohibit_entry),
+ GFP_KERNEL);
+ if (!net->ipv6.ip6_prohibit_entry)
+ goto out_ip6_null_entry;
+ net->ipv6.ip6_prohibit_entry->dst.path =
+ (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
+ net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
+ dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
+ ip6_template_metrics, true);
+
+ net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
+ sizeof(*net->ipv6.ip6_blk_hole_entry),
+ GFP_KERNEL);
+ if (!net->ipv6.ip6_blk_hole_entry)
+ goto out_ip6_prohibit_entry;
+ net->ipv6.ip6_blk_hole_entry->dst.path =
+ (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
+ net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
+ dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
+ ip6_template_metrics, true);
+#endif
+
+ net->ipv6.sysctl.flush_delay = 0;
+ net->ipv6.sysctl.ip6_rt_max_size = 4096;
+ net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
+ net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
+ net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
+ net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
+ net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
+ net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
+
+ net->ipv6.ip6_rt_gc_expire = 30*HZ;
+
+ ret = 0;
+out:
+ return ret;
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+out_ip6_prohibit_entry:
+ kfree(net->ipv6.ip6_prohibit_entry);
+out_ip6_null_entry:
+ kfree(net->ipv6.ip6_null_entry);
+#endif
+out_ip6_dst_entries:
+ dst_entries_destroy(&net->ipv6.ip6_dst_ops);
+out_ip6_dst_ops:
+ goto out;
+}
+
+static void __net_exit ip6_route_net_exit(struct net *net)
+{
+ kfree(net->ipv6.ip6_null_entry);
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ kfree(net->ipv6.ip6_prohibit_entry);
+ kfree(net->ipv6.ip6_blk_hole_entry);
+#endif
+ dst_entries_destroy(&net->ipv6.ip6_dst_ops);
+}
+
+static int __net_init ip6_route_net_init_late(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
+ proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
+#endif
+ return 0;
+}
+
+static void __net_exit ip6_route_net_exit_late(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ proc_net_remove(net, "ipv6_route");
+ proc_net_remove(net, "rt6_stats");
+#endif
+}
+
+static struct pernet_operations ip6_route_net_ops = {
+ .init = ip6_route_net_init,
+ .exit = ip6_route_net_exit,
+};
+
+static struct pernet_operations ip6_route_net_late_ops = {
+ .init = ip6_route_net_init_late,
+ .exit = ip6_route_net_exit_late,
+};
+
+static struct notifier_block ip6_route_dev_notifier = {
+ .notifier_call = ip6_route_dev_notify,
+ .priority = 0,
+};
+
+int __init ip6_route_init(void)
+{
+ int ret;
+
+ ret = -ENOMEM;
+ ip6_dst_ops_template.kmem_cachep =
+ kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!ip6_dst_ops_template.kmem_cachep)
+ goto out;
+
+ ret = dst_entries_init(&ip6_dst_blackhole_ops);
+ if (ret)
+ goto out_kmem_cache;
+
+ ret = register_pernet_subsys(&ip6_route_net_ops);
+ if (ret)
+ goto out_dst_entries;
+
+ ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
+
+ /* Registering of the loopback is done before this portion of code,
+ * the loopback reference in rt6_info will not be taken, do it
+ * manually for init_net */
+ init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ #ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ #endif
+ ret = fib6_init();
+ if (ret)
+ goto out_register_subsys;
+
+ ret = xfrm6_init();
+ if (ret)
+ goto out_fib6_init;
+
+ ret = fib6_rules_init();
+ if (ret)
+ goto xfrm6_init;
+
+ ret = register_pernet_subsys(&ip6_route_net_late_ops);
+ if (ret)
+ goto fib6_rules_init;
+
+ ret = -ENOBUFS;
+ if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
+ __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
+ __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
+ goto out_register_late_subsys;
+
+ ret = register_netdevice_notifier(&ip6_route_dev_notifier);
+ if (ret)
+ goto out_register_late_subsys;
+
+out:
+ return ret;
+
+out_register_late_subsys:
+ unregister_pernet_subsys(&ip6_route_net_late_ops);
+fib6_rules_init:
+ fib6_rules_cleanup();
+xfrm6_init:
+ xfrm6_fini();
+out_fib6_init:
+ fib6_gc_cleanup();
+out_register_subsys:
+ unregister_pernet_subsys(&ip6_route_net_ops);
+out_dst_entries:
+ dst_entries_destroy(&ip6_dst_blackhole_ops);
+out_kmem_cache:
+ kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
+ goto out;
+}
+
+void ip6_route_cleanup(void)
+{
+ unregister_netdevice_notifier(&ip6_route_dev_notifier);
+ unregister_pernet_subsys(&ip6_route_net_late_ops);
+ fib6_rules_cleanup();
+ xfrm6_fini();
+ fib6_gc_cleanup();
+ unregister_pernet_subsys(&ip6_route_net_ops);
+ dst_entries_destroy(&ip6_dst_blackhole_ops);
+ kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
+}