diff options
Diffstat (limited to 'net/ipv6/route.c')
| -rw-r--r-- | net/ipv6/route.c | 2131 |
1 files changed, 2131 insertions, 0 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c new file mode 100644 index 0000000..1838029 --- /dev/null +++ b/net/ipv6/route.c @@ -0,0 +1,2131 @@ +/* + * Linux INET6 implementation + * FIB front-end. + * + * Authors: + * Pedro Roque <roque@di.fc.ul.pt> + * + * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ + * + * 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. + */ + +#include <linux/config.h> +#include <linux/errno.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/init.h> +#include <linux/netlink.h> +#include <linux/if_arp.h> + +#ifdef CONFIG_PROC_FS +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#endif + +#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 <asm/uaccess.h> + +#ifdef CONFIG_SYSCTL +#include <linux/sysctl.h> +#endif + +/* Set to 3 to get tracing. */ +#define RT6_DEBUG 2 + +#if RT6_DEBUG >= 3 +#define RDBG(x) printk x +#define RT6_TRACE(x...) printk(KERN_DEBUG x) +#else +#define RDBG(x) +#define RT6_TRACE(x...) do { ; } while (0) +#endif + + +static int ip6_rt_max_size = 4096; +static int ip6_rt_gc_min_interval = HZ / 2; +static int ip6_rt_gc_timeout = 60*HZ; +int ip6_rt_gc_interval = 30*HZ; +static int ip6_rt_gc_elasticity = 9; +static int ip6_rt_mtu_expires = 10*60*HZ; +static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; + +static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); +static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); +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(void); + +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); + +static struct dst_ops ip6_dst_ops = { + .family = AF_INET6, + .protocol = __constant_htons(ETH_P_IPV6), + .gc = ip6_dst_gc, + .gc_thresh = 1024, + .check = ip6_dst_check, + .destroy = ip6_dst_destroy, + .ifdown = ip6_dst_ifdown, + .negative_advice = ip6_negative_advice, + .link_failure = ip6_link_failure, + .update_pmtu = ip6_rt_update_pmtu, + .entry_size = sizeof(struct rt6_info), +}; + +struct rt6_info ip6_null_entry = { + .u = { + .dst = { + .__refcnt = ATOMIC_INIT(1), + .__use = 1, + .dev = &loopback_dev, + .obsolete = -1, + .error = -ENETUNREACH, + .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, + .input = ip6_pkt_discard, + .output = ip6_pkt_discard_out, + .ops = &ip6_dst_ops, + .path = (struct dst_entry*)&ip6_null_entry, + } + }, + .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), + .rt6i_metric = ~(u32) 0, + .rt6i_ref = ATOMIC_INIT(1), +}; + +struct fib6_node ip6_routing_table = { + .leaf = &ip6_null_entry, + .fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO, +}; + +/* Protects all the ip6 fib */ + +DEFINE_RWLOCK(rt6_lock); + + +/* allocate dst with ip6_dst_ops */ +static __inline__ struct rt6_info *ip6_dst_alloc(void) +{ + return (struct rt6_info *)dst_alloc(&ip6_dst_ops); +} + +static void ip6_dst_destroy(struct dst_entry *dst) +{ + struct rt6_info *rt = (struct rt6_info *)dst; + struct inet6_dev *idev = rt->rt6i_idev; + + if (idev != NULL) { + rt->rt6i_idev = NULL; + in6_dev_put(idev); + } +} + +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; + + if (dev != &loopback_dev && idev != NULL && idev->dev == dev) { + struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev); + if (loopback_idev != NULL) { + rt->rt6i_idev = loopback_idev; + in6_dev_put(idev); + } + } +} + +static __inline__ int rt6_check_expired(const struct rt6_info *rt) +{ + return (rt->rt6i_flags & RTF_EXPIRES && + time_after(jiffies, rt->rt6i_expires)); +} + +/* + * Route lookup. Any rt6_lock is implied. + */ + +static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, + int oif, + int strict) +{ + struct rt6_info *local = NULL; + struct rt6_info *sprt; + + if (oif) { + for (sprt = rt; sprt; sprt = sprt->u.next) { + struct net_device *dev = sprt->rt6i_dev; + if (dev->ifindex == oif) + return sprt; + if (dev->flags & IFF_LOOPBACK) { + if (sprt->rt6i_idev == NULL || + sprt->rt6i_idev->dev->ifindex != oif) { + if (strict && oif) + continue; + if (local && (!oif || + local->rt6i_idev->dev->ifindex == oif)) + continue; + } + local = sprt; + } + } + + if (local) + return local; + + if (strict) + return &ip6_null_entry; + } + return rt; +} + +/* + * pointer to the last default router chosen. BH is disabled locally. + */ +static struct rt6_info *rt6_dflt_pointer; +static DEFINE_SPINLOCK(rt6_dflt_lock); + +void rt6_reset_dflt_pointer(struct rt6_info *rt) +{ + spin_lock_bh(&rt6_dflt_lock); + if (rt == NULL || rt == rt6_dflt_pointer) { + RT6_TRACE("reset default router: %p->NULL\n", rt6_dflt_pointer); + rt6_dflt_pointer = NULL; + } + spin_unlock_bh(&rt6_dflt_lock); +} + +/* Default Router Selection (RFC 2461 6.3.6) */ +static struct rt6_info *rt6_best_dflt(struct rt6_info *rt, int oif) +{ + struct rt6_info *match = NULL; + struct rt6_info *sprt; + int mpri = 0; + + for (sprt = rt; sprt; sprt = sprt->u.next) { + struct neighbour *neigh; + int m = 0; + + if (!oif || + (sprt->rt6i_dev && + sprt->rt6i_dev->ifindex == oif)) + m += 8; + + if (rt6_check_expired(sprt)) + continue; + + if (sprt == rt6_dflt_pointer) + m += 4; + + if ((neigh = sprt->rt6i_nexthop) != NULL) { + read_lock_bh(&neigh->lock); + switch (neigh->nud_state) { + case NUD_REACHABLE: + m += 3; + break; + + case NUD_STALE: + case NUD_DELAY: + case NUD_PROBE: + m += 2; + break; + + case NUD_NOARP: + case NUD_PERMANENT: + m += 1; + break; + + case NUD_INCOMPLETE: + default: + read_unlock_bh(&neigh->lock); + continue; + } + read_unlock_bh(&neigh->lock); + } else { + continue; + } + + if (m > mpri || m >= 12) { + match = sprt; + mpri = m; + if (m >= 12) { + /* we choose the last default router if it + * is in (probably) reachable state. + * If route changed, we should do pmtu + * discovery. --yoshfuji + */ + break; + } + } + } + + spin_lock(&rt6_dflt_lock); + if (!match) { + /* + * No default routers are known to be reachable. + * SHOULD round robin + */ + if (rt6_dflt_pointer) { + for (sprt = rt6_dflt_pointer->u.next; + sprt; sprt = sprt->u.next) { + if (sprt->u.dst.obsolete <= 0 && + sprt->u.dst.error == 0 && + !rt6_check_expired(sprt)) { + match = sprt; + break; + } + } + for (sprt = rt; + !match && sprt; + sprt = sprt->u.next) { + if (sprt->u.dst.obsolete <= 0 && + sprt->u.dst.error == 0 && + !rt6_check_expired(sprt)) { + match = sprt; + break; + } + if (sprt == rt6_dflt_pointer) + break; + } + } + } + + if (match) { + if (rt6_dflt_pointer != match) + RT6_TRACE("changed default router: %p->%p\n", + rt6_dflt_pointer, match); + rt6_dflt_pointer = match; + } + spin_unlock(&rt6_dflt_lock); + + if (!match) { + /* + * Last Resort: if no default routers found, + * use addrconf default route. + * We don't record this route. + */ + for (sprt = ip6_routing_table.leaf; + sprt; sprt = sprt->u.next) { + if (!rt6_check_expired(sprt) && + (sprt->rt6i_flags & RTF_DEFAULT) && + (!oif || + (sprt->rt6i_dev && + sprt->rt6i_dev->ifindex == oif))) { + match = sprt; + break; + } + } + if (!match) { + /* no default route. give up. */ + match = &ip6_null_entry; + } + } + + return match; +} + +struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, + int oif, int strict) +{ + struct fib6_node *fn; + struct rt6_info *rt; + + read_lock_bh(&rt6_lock); + fn = fib6_lookup(&ip6_routing_table, daddr, saddr); + rt = rt6_device_match(fn->leaf, oif, strict); + dst_hold(&rt->u.dst); + rt->u.dst.__use++; + read_unlock_bh(&rt6_lock); + + rt->u.dst.lastuse = jiffies; + if (rt->u.dst.error == 0) + return rt; + dst_release(&rt->u.dst); + return NULL; +} + +/* ip6_ins_rt is called with FREE rt6_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. + */ + +int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr) +{ + int err; + + write_lock_bh(&rt6_lock); + err = fib6_add(&ip6_routing_table, rt, nlh, _rtattr); + write_unlock_bh(&rt6_lock); + + return err; +} + +/* No rt6_lock! If COW failed, the function returns dead route entry + with dst->error set to errno value. + */ + +static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr, + struct in6_addr *saddr) +{ + int err; + struct rt6_info *rt; + + /* + * Clone the route. + */ + + rt = ip6_rt_copy(ort); + + if (rt) { + ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); + + if (!(rt->rt6i_flags&RTF_GATEWAY)) + ipv6_addr_copy(&rt->rt6i_gateway, daddr); + + rt->rt6i_dst.plen = 128; + rt->rt6i_flags |= RTF_CACHE; + rt->u.dst.flags |= DST_HOST; + +#ifdef CONFIG_IPV6_SUBTREES + if (rt->rt6i_src.plen && saddr) { + ipv6_addr_copy(&rt->rt6i_src.addr, saddr); + rt->rt6i_src.plen = 128; + } +#endif + + rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); + + dst_hold(&rt->u.dst); + + err = ip6_ins_rt(rt, NULL, NULL); + if (err == 0) + return rt; + + rt->u.dst.error = err; + + return rt; + } + dst_hold(&ip6_null_entry.u.dst); + return &ip6_null_entry; +} + +#define BACKTRACK() \ +if (rt == &ip6_null_entry && strict) { \ + while ((fn = fn->parent) != NULL) { \ + if (fn->fn_flags & RTN_ROOT) { \ + dst_hold(&rt->u.dst); \ + goto out; \ + } \ + if (fn->fn_flags & RTN_RTINFO) \ + goto restart; \ + } \ +} + + +void ip6_route_input(struct sk_buff *skb) +{ + struct fib6_node *fn; + struct rt6_info *rt; + int strict; + int attempts = 3; + + strict = ipv6_addr_type(&skb->nh.ipv6h->daddr) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL); + +relookup: + read_lock_bh(&rt6_lock); + + fn = fib6_lookup(&ip6_routing_table, &skb->nh.ipv6h->daddr, + &skb->nh.ipv6h->saddr); + +restart: + rt = fn->leaf; + + if ((rt->rt6i_flags & RTF_CACHE)) { + rt = rt6_device_match(rt, skb->dev->ifindex, strict); + BACKTRACK(); + dst_hold(&rt->u.dst); + goto out; + } + + rt = rt6_device_match(rt, skb->dev->ifindex, 0); + BACKTRACK(); + + if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) { + struct rt6_info *nrt; + dst_hold(&rt->u.dst); + read_unlock_bh(&rt6_lock); + + nrt = rt6_cow(rt, &skb->nh.ipv6h->daddr, + &skb->nh.ipv6h->saddr); + + dst_release(&rt->u.dst); + rt = nrt; + + if (rt->u.dst.error != -EEXIST || --attempts <= 0) + goto out2; + + /* Race condition! In the gap, when rt6_lock was + released someone could insert this route. Relookup. + */ + dst_release(&rt->u.dst); + goto relookup; + } + dst_hold(&rt->u.dst); + +out: + read_unlock_bh(&rt6_lock); +out2: + rt->u.dst.lastuse = jiffies; + rt->u.dst.__use++; + skb->dst = (struct dst_entry *) rt; +} + +struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) +{ + struct fib6_node *fn; + struct rt6_info *rt; + int strict; + int attempts = 3; + + strict = ipv6_addr_type(&fl->fl6_dst) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL); + +relookup: + read_lock_bh(&rt6_lock); + + fn = fib6_lookup(&ip6_routing_table, &fl->fl6_dst, &fl->fl6_src); + +restart: + rt = fn->leaf; + + if ((rt->rt6i_flags & RTF_CACHE)) { + rt = rt6_device_match(rt, fl->oif, strict); + BACKTRACK(); + dst_hold(&rt->u.dst); + goto out; + } + if (rt->rt6i_flags & RTF_DEFAULT) { + if (rt->rt6i_metric >= IP6_RT_PRIO_ADDRCONF) + rt = rt6_best_dflt(rt, fl->oif); + } else { + rt = rt6_device_match(rt, fl->oif, strict); + BACKTRACK(); + } + + if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) { + struct rt6_info *nrt; + dst_hold(&rt->u.dst); + read_unlock_bh(&rt6_lock); + + nrt = rt6_cow(rt, &fl->fl6_dst, &fl->fl6_src); + + dst_release(&rt->u.dst); + rt = nrt; + + if (rt->u.dst.error != -EEXIST || --attempts <= 0) + goto out2; + + /* Race condition! In the gap, when rt6_lock was + released someone could insert this route. Relookup. + */ + dst_release(&rt->u.dst); + goto relookup; + } + dst_hold(&rt->u.dst); + +out: + read_unlock_bh(&rt6_lock); +out2: + rt->u.dst.lastuse = jiffies; + rt->u.dst.__use++; + return &rt->u.dst; +} + + +/* + * 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 && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) + 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) + ip6_del_rt(rt, NULL, NULL); + else + dst_release(dst); + } + return NULL; +} + +static void ip6_link_failure(struct sk_buff *skb) +{ + struct rt6_info *rt; + + icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); + + rt = (struct rt6_info *) skb->dst; + if (rt) { + if (rt->rt6i_flags&RTF_CACHE) { + dst_set_expires(&rt->u.dst, 0); + rt->rt6i_flags |= RTF_EXPIRES; + } 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) { + mtu = IPV6_MIN_MTU; + dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; + } + dst->metrics[RTAX_MTU-1] = mtu; + } +} + +/* Protected by rt6_lock. */ +static struct dst_entry *ndisc_dst_gc_list; +static int ipv6_get_mtu(struct net_device *dev); + +static inline unsigned int ipv6_advmss(unsigned int mtu) +{ + mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); + + if (mtu < ip6_rt_min_advmss) + mtu = 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; +} + +struct dst_entry *ndisc_dst_alloc(struct net_device *dev, + struct neighbour *neigh, + struct in6_addr *addr, + int (*output)(struct sk_buff *)) +{ + struct rt6_info *rt; + struct inet6_dev *idev = in6_dev_get(dev); + + if (unlikely(idev == NULL)) + return NULL; + + rt = ip6_dst_alloc(); + if (unlikely(rt == NULL)) { + in6_dev_put(idev); + goto out; + } + + dev_hold(dev); + if (neigh) + neigh_hold(neigh); + else + neigh = ndisc_get_neigh(dev, addr); + + rt->rt6i_dev = dev; + rt->rt6i_idev = idev; + rt->rt6i_nexthop = neigh; + atomic_set(&rt->u.dst.__refcnt, 1); + rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; + rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); + rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); + rt->u.dst.output = output; + +#if 0 /* there's no chance to use these for ndisc */ + rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST + ? DST_HOST + : 0; + ipv6_addr_copy(&rt->rt6i_dst.addr, addr); + rt->rt6i_dst.plen = 128; +#endif + + write_lock_bh(&rt6_lock); + rt->u.dst.next = ndisc_dst_gc_list; + ndisc_dst_gc_list = &rt->u.dst; + write_unlock_bh(&rt6_lock); + + fib6_force_start_gc(); + +out: + return (struct dst_entry *)rt; +} + +int ndisc_dst_gc(int *more) +{ + struct dst_entry *dst, *next, **pprev; + int freed; + + next = NULL; + pprev = &ndisc_dst_gc_list; + freed = 0; + while ((dst = *pprev) != NULL) { + if (!atomic_read(&dst->__refcnt)) { + *pprev = dst->next; + dst_free(dst); + freed++; + } else { + pprev = &dst->next; + (*more)++; + } + } + + return freed; +} + +static int ip6_dst_gc(void) +{ + static unsigned expire = 30*HZ; + static unsigned long last_gc; + unsigned long now = jiffies; + + if (time_after(last_gc + ip6_rt_gc_min_interval, now) && + atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) + goto out; + + expire++; + fib6_run_gc(expire); + last_gc = now; + if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) + expire = ip6_rt_gc_timeout>>1; + +out: + expire -= expire>>ip6_rt_gc_elasticity; + return (atomic_read(&ip6_dst_ops.entries) > ip6_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! + */ + +static int ipv6_get_mtu(struct net_device *dev) +{ + int mtu = IPV6_MIN_MTU; + struct inet6_dev *idev; + + idev = in6_dev_get(dev); + if (idev) { + mtu = idev->cnf.mtu6; + in6_dev_put(idev); + } + return mtu; +} + +int ipv6_get_hoplimit(struct net_device *dev) +{ + int hoplimit = ipv6_devconf.hop_limit; + struct inet6_dev *idev; + + idev = in6_dev_get(dev); + if (idev) { + hoplimit = idev->cnf.hop_limit; + in6_dev_put(idev); + } + return hoplimit; +} + +/* + * + */ + +int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr) +{ + int err; + struct rtmsg *r; + struct rtattr **rta; + struct rt6_info *rt = NULL; + struct net_device *dev = NULL; + struct inet6_dev *idev = NULL; + int addr_type; + + rta = (struct rtattr **) _rtattr; + + if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128) + return -EINVAL; +#ifndef CONFIG_IPV6_SUBTREES + if (rtmsg->rtmsg_src_len) + return -EINVAL; +#endif + if (rtmsg->rtmsg_ifindex) { + err = -ENODEV; + dev = dev_get_by_index(rtmsg->rtmsg_ifindex); + if (!dev) + goto out; + idev = in6_dev_get(dev); + if (!idev) + goto out; + } + + if (rtmsg->rtmsg_metric == 0) + rtmsg->rtmsg_metric = IP6_RT_PRIO_USER; + + rt = ip6_dst_alloc(); + + if (rt == NULL) { + err = -ENOMEM; + goto out; + } + + rt->u.dst.obsolete = -1; + rt->rt6i_expires = clock_t_to_jiffies(rtmsg->rtmsg_info); + if (nlh && (r = NLMSG_DATA(nlh))) { + rt->rt6i_protocol = r->rtm_protocol; + } else { + rt->rt6i_protocol = RTPROT_BOOT; + } + + addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst); + + if (addr_type & IPV6_ADDR_MULTICAST) + rt->u.dst.input = ip6_mc_input; + else + rt->u.dst.input = ip6_forward; + + rt->u.dst.output = ip6_output; + + ipv6_addr_prefix(&rt->rt6i_dst.addr, + &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len); + rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len; + if (rt->rt6i_dst.plen == 128) + rt->u.dst.flags = DST_HOST; + +#ifdef CONFIG_IPV6_SUBTREES + ipv6_addr_prefix(&rt->rt6i_src.addr, + &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); + rt->rt6i_src.plen = rtmsg->rtmsg_src_len; +#endif + + rt->rt6i_metric = rtmsg->rtmsg_metric; + + /* We cannot add true routes via loopback here, + they would result in kernel looping; promote them to reject routes + */ + if ((rtmsg->rtmsg_flags&RTF_REJECT) || + (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { + /* hold loopback dev/idev if we haven't done so. */ + if (dev != &loopback_dev) { + if (dev) { + dev_put(dev); + in6_dev_put(idev); + } + dev = &loopback_dev; + dev_hold(dev); + idev = in6_dev_get(dev); + if (!idev) { + err = -ENODEV; + goto out; + } + } + rt->u.dst.output = ip6_pkt_discard_out; + rt->u.dst.input = ip6_pkt_discard; + rt->u.dst.error = -ENETUNREACH; + rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; + goto install_route; + } + + if (rtmsg->rtmsg_flags & RTF_GATEWAY) { + struct in6_addr *gw_addr; + int gwa_type; + + gw_addr = &rtmsg->rtmsg_gateway; + ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway); + 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(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1); + + err = -EHOSTUNREACH; + if (grt == NULL) + goto out; + if (dev) { + if (dev != grt->rt6i_dev) { + dst_release(&grt->u.dst); + goto out; + } + } else { + dev = grt->rt6i_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->u.dst); + + if (err) + goto out; + } + err = -EINVAL; + if (dev == NULL || (dev->flags&IFF_LOOPBACK)) + goto out; + } + + err = -ENODEV; + if (dev == NULL) + goto out; + + if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) { + rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); + if (IS_ERR(rt->rt6i_nexthop)) { + err = PTR_ERR(rt->rt6i_nexthop); + rt->rt6i_nexthop = NULL; + goto out; + } + } + + rt->rt6i_flags = rtmsg->rtmsg_flags; + +install_route: + if (rta && rta[RTA_METRICS-1]) { + int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]); + struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]); + + while (RTA_OK(attr, attrlen)) { + unsigned flavor = attr->rta_type; + if (flavor) { + if (flavor > RTAX_MAX) { + err = -EINVAL; + goto out; + } + rt->u.dst.metrics[flavor-1] = + *(u32 *)RTA_DATA(attr); + } + attr = RTA_NEXT(attr, attrlen); + } + } + + if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) + rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; + if (!rt->u.dst.metrics[RTAX_MTU-1]) + rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); + if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) + rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); + rt->u.dst.dev = dev; + rt->rt6i_idev = idev; + return ip6_ins_rt(rt, nlh, _rtattr); + +out: + if (dev) + dev_put(dev); + if (idev) + in6_dev_put(idev); + if (rt) + dst_free((struct dst_entry *) rt); + return err; +} + +int ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr) +{ + int err; + + write_lock_bh(&rt6_lock); + + rt6_reset_dflt_pointer(NULL); + + err = fib6_del(rt, nlh, _rtattr); + dst_release(&rt->u.dst); + + write_unlock_bh(&rt6_lock); + + return err; +} + +static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr) +{ + struct fib6_node *fn; + struct rt6_info *rt; + int err = -ESRCH; + + read_lock_bh(&rt6_lock); + + fn = fib6_locate(&ip6_routing_table, + &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len, + &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); + + if (fn) { + for (rt = fn->leaf; rt; rt = rt->u.next) { + if (rtmsg->rtmsg_ifindex && + (rt->rt6i_dev == NULL || + rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex)) + continue; + if (rtmsg->rtmsg_flags&RTF_GATEWAY && + !ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway)) + continue; + if (rtmsg->rtmsg_metric && + rtmsg->rtmsg_metric != rt->rt6i_metric) + continue; + dst_hold(&rt->u.dst); + read_unlock_bh(&rt6_lock); + + return ip6_del_rt(rt, nlh, _rtattr); + } + } + read_unlock_bh(&rt6_lock); + + return err; +} + +/* + * Handle redirects + */ +void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr, + struct neighbour *neigh, u8 *lladdr, int on_link) +{ + struct rt6_info *rt, *nrt; + + /* Locate old route to this destination. */ + rt = rt6_lookup(dest, NULL, neigh->dev->ifindex, 1); + + if (rt == NULL) + return; + + if (neigh->dev != rt->rt6i_dev) + goto out; + + /* + * 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 (!(rt->rt6i_flags&RTF_GATEWAY)) + goto out; + + /* + * RFC 2461 specifies that redirects should only be + * accepted if they come from the nexthop to the target. + * Due to the way default routers are chosen, this notion + * is a bit fuzzy and one might need to check all default + * routers. + */ + if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway)) { + if (rt->rt6i_flags & RTF_DEFAULT) { + struct rt6_info *rt1; + + read_lock(&rt6_lock); + for (rt1 = ip6_routing_table.leaf; rt1; rt1 = rt1->u.next) { + if (ipv6_addr_equal(saddr, &rt1->rt6i_gateway)) { + dst_hold(&rt1->u.dst); + dst_release(&rt->u.dst); + read_unlock(&rt6_lock); + rt = rt1; + goto source_ok; + } + } + read_unlock(&rt6_lock); + } + if (net_ratelimit()) + printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " + "for redirect target\n"); + goto out; + } + +source_ok: + + /* + * 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->u.dst); + + /* Duplicate redirect: silently ignore. */ + if (neigh == rt->u.dst.neighbour) + goto out; + + nrt = ip6_rt_copy(rt); + if (nrt == NULL) + goto out; + + nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; + if (on_link) + nrt->rt6i_flags &= ~RTF_GATEWAY; + + ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); + nrt->rt6i_dst.plen = 128; + nrt->u.dst.flags |= DST_HOST; + + ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); + nrt->rt6i_nexthop = neigh_clone(neigh); + /* Reset pmtu, it may be better */ + nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); + nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); + + if (ip6_ins_rt(nrt, NULL, NULL)) + goto out; + + if (rt->rt6i_flags&RTF_CACHE) { + ip6_del_rt(rt, NULL, NULL); + return; + } + +out: + dst_release(&rt->u.dst); + return; +} + +/* + * Handle ICMP "packet too big" messages + * i.e. Path MTU discovery + */ + +void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, + struct net_device *dev, u32 pmtu) +{ + struct rt6_info *rt, *nrt; + int allfrag = 0; + + rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); + if (rt == NULL) + return; + + if (pmtu >= dst_mtu(&rt->u.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->u.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) { + rt->u.dst.metrics[RTAX_MTU-1] = pmtu; + if (allfrag) + rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; + dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); + rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; + 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 (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) { + nrt = rt6_cow(rt, daddr, saddr); + if (!nrt->u.dst.error) { + nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; + if (allfrag) + nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; + /* 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. + */ + dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); + nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; + } + dst_release(&nrt->u.dst); + } else { + nrt = ip6_rt_copy(rt); + if (nrt == NULL) + goto out; + ipv6_addr_copy(&nrt->rt6i_dst.addr, daddr); + nrt->rt6i_dst.plen = 128; + nrt->u.dst.flags |= DST_HOST; + nrt->rt6i_nexthop = neigh_clone(rt->rt6i_nexthop); + dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); + nrt->rt6i_flags |= RTF_DYNAMIC|RTF_CACHE|RTF_EXPIRES; + nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; + if (allfrag) + nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; + ip6_ins_rt(nrt, NULL, NULL); + } + +out: + dst_release(&rt->u.dst); +} + +/* + * Misc support functions + */ + +static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) +{ + struct rt6_info *rt = ip6_dst_alloc(); + + if (rt) { + rt->u.dst.input = ort->u.dst.input; + rt->u.dst.output = ort->u.dst.output; + + memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); + rt->u.dst.dev = ort->u.dst.dev; + if (rt->u.dst.dev) + dev_hold(rt->u.dst.dev); + rt->rt6i_idev = ort->rt6i_idev; + if (rt->rt6i_idev) + in6_dev_hold(rt->rt6i_idev); + rt->u.dst.lastuse = jiffies; + rt->rt6i_expires = 0; + + ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); + rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; + 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 + } + return rt; +} + +struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) +{ + struct rt6_info *rt; + struct fib6_node *fn; + + fn = &ip6_routing_table; + + write_lock_bh(&rt6_lock); + for (rt = fn->leaf; rt; rt=rt->u.next) { + if (dev == rt->rt6i_dev && + ipv6_addr_equal(&rt->rt6i_gateway, addr)) + break; + } + if (rt) + dst_hold(&rt->u.dst); + write_unlock_bh(&rt6_lock); + return rt; +} + +struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, + struct net_device *dev) +{ + struct in6_rtmsg rtmsg; + + memset(&rtmsg, 0, sizeof(struct in6_rtmsg)); + rtmsg.rtmsg_type = RTMSG_NEWROUTE; + ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr); + rtmsg.rtmsg_metric = 1024; + rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES; + + rtmsg.rtmsg_ifindex = dev->ifindex; + + ip6_route_add(&rtmsg, NULL, NULL); + return rt6_get_dflt_router(gwaddr, dev); +} + +void rt6_purge_dflt_routers(void) +{ + struct rt6_info *rt; + +restart: + read_lock_bh(&rt6_lock); + for (rt = ip6_routing_table.leaf; rt; rt = rt->u.next) { + if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { + dst_hold(&rt->u.dst); + + rt6_reset_dflt_pointer(NULL); + + read_unlock_bh(&rt6_lock); + + ip6_del_rt(rt, NULL, NULL); + + goto restart; + } + } + read_unlock_bh(&rt6_lock); +} + +int ipv6_route_ioctl(unsigned int cmd, void __user *arg) +{ + 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; + + rtnl_lock(); + switch (cmd) { + case SIOCADDRT: + err = ip6_route_add(&rtmsg, NULL, NULL); + break; + case SIOCDELRT: + err = ip6_route_del(&rtmsg, NULL, NULL); + break; + default: + err = -EINVAL; + } + rtnl_unlock(); + + return err; + }; + + return -EINVAL; +} + +/* + * Drop the packet on the floor + */ + +int ip6_pkt_discard(struct sk_buff *skb) +{ + IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); + icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev); + kfree_skb(skb); + return 0; +} + +int ip6_pkt_discard_out(struct sk_buff *skb) +{ + skb->dev = skb->dst->dev; + return ip6_pkt_discard(skb); +} + +/* + * Allocate a dst for local (unicast / anycast) address. + */ + +struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, + const struct in6_addr *addr, + int anycast) +{ + struct rt6_info *rt = ip6_dst_alloc(); + + if (rt == NULL) + return ERR_PTR(-ENOMEM); + + dev_hold(&loopback_dev); + in6_dev_hold(idev); + + rt->u.dst.flags = DST_HOST; + rt->u.dst.input = ip6_input; + rt->u.dst.output = ip6_output; + rt->rt6i_dev = &loopback_dev; + rt->rt6i_idev = idev; + rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); + rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); + rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; + rt->u.dst.obsolete = -1; + + rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; + if (!anycast) + rt->rt6i_flags |= RTF_LOCAL; + rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); + if (rt->rt6i_nexthop == NULL) { + dst_free((struct dst_entry *) rt); + return ERR_PTR(-ENOMEM); + } + + ipv6_addr_copy(&rt->rt6i_dst.addr, addr); + rt->rt6i_dst.plen = 128; + + atomic_set(&rt->u.dst.__refcnt, 1); + + return rt; +} + +static int fib6_ifdown(struct rt6_info *rt, void *arg) +{ + if (((void*)rt->rt6i_dev == arg || arg == NULL) && + rt != &ip6_null_entry) { + RT6_TRACE("deleted by ifdown %p\n", rt); + return -1; + } + return 0; +} + +void rt6_ifdown(struct net_device *dev) +{ + write_lock_bh(&rt6_lock); + fib6_clean_tree(&ip6_routing_table, fib6_ifdown, 0, dev); + write_unlock_bh(&rt6_lock); +} + +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 == NULL) + 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->rt6i_dev == arg->dev && + !dst_metric_locked(&rt->u.dst, RTAX_MTU) && + (dst_mtu(&rt->u.dst) > arg->mtu || + (dst_mtu(&rt->u.dst) < arg->mtu && + dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) + rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; + rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); + return 0; +} + +void rt6_mtu_change(struct net_device *dev, unsigned mtu) +{ + struct rt6_mtu_change_arg arg; + + arg.dev = dev; + arg.mtu = mtu; + read_lock_bh(&rt6_lock); + fib6_clean_tree(&ip6_routing_table, rt6_mtu_change_route, 0, &arg); + read_unlock_bh(&rt6_lock); +} + +static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta, + struct in6_rtmsg *rtmsg) +{ + memset(rtmsg, 0, sizeof(*rtmsg)); + + rtmsg->rtmsg_dst_len = r->rtm_dst_len; + rtmsg->rtmsg_src_len = r->rtm_src_len; + rtmsg->rtmsg_flags = RTF_UP; + if (r->rtm_type == RTN_UNREACHABLE) + rtmsg->rtmsg_flags |= RTF_REJECT; + + if (rta[RTA_GATEWAY-1]) { + if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16)) + return -EINVAL; + memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16); + rtmsg->rtmsg_flags |= RTF_GATEWAY; + } + if (rta[RTA_DST-1]) { + if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3)) + return -EINVAL; + memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3)); + } + if (rta[RTA_SRC-1]) { + if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3)) + return -EINVAL; + memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3)); + } + if (rta[RTA_OIF-1]) { + if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int))) + return -EINVAL; + memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); + } + if (rta[RTA_PRIORITY-1]) { + if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4)) + return -EINVAL; + memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4); + } + return 0; +} + +int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) +{ + struct rtmsg *r = NLMSG_DATA(nlh); + struct in6_rtmsg rtmsg; + + if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) + return -EINVAL; + return ip6_route_del(&rtmsg, nlh, arg); +} + +int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) +{ + struct rtmsg *r = NLMSG_DATA(nlh); + struct in6_rtmsg rtmsg; + + if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) + return -EINVAL; + return ip6_route_add(&rtmsg, nlh, arg); +} + +struct rt6_rtnl_dump_arg +{ + struct sk_buff *skb; + struct netlink_callback *cb; +}; + +static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, + struct in6_addr *dst, + struct in6_addr *src, + int iif, + int type, u32 pid, u32 seq, + struct nlmsghdr *in_nlh, int prefix) +{ + struct rtmsg *rtm; + struct nlmsghdr *nlh; + unsigned char *b = skb->tail; + struct rta_cacheinfo ci; + + if (prefix) { /* user wants prefix routes only */ + if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { + /* success since this is not a prefix route */ + return 1; + } + } + + if (!pid && in_nlh) { + pid = in_nlh->nlmsg_pid; + } + + nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*rtm)); + 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; + rtm->rtm_table = RT_TABLE_MAIN; + if (rt->rt6i_flags&RTF_REJECT) + rtm->rtm_type = RTN_UNREACHABLE; + else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) + rtm->rtm_type = RTN_LOCAL; + else + rtm->rtm_type = RTN_UNICAST; + 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) { + RTA_PUT(skb, RTA_DST, 16, dst); + rtm->rtm_dst_len = 128; + } else if (rtm->rtm_dst_len) + RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); +#ifdef CONFIG_IPV6_SUBTREES + if (src) { + RTA_PUT(skb, RTA_SRC, 16, src); + rtm->rtm_src_len = 128; + } else if (rtm->rtm_src_len) + RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); +#endif + if (iif) + RTA_PUT(skb, RTA_IIF, 4, &iif); + else if (dst) { + struct in6_addr saddr_buf; + if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) + RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); + } + if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) + goto rtattr_failure; + if (rt->u.dst.neighbour) + RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); + if (rt->u.dst.dev) + RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex); + RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric); + ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); + if (rt->rt6i_expires) + ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies); + else + ci.rta_expires = 0; + ci.rta_used = rt->u.dst.__use; + ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); + ci.rta_error = rt->u.dst.error; + ci.rta_id = 0; + ci.rta_ts = 0; + ci.rta_tsage = 0; + RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); + nlh->nlmsg_len = skb->tail - b; + return skb->len; + +nlmsg_failure: +rtattr_failure: + skb_trim(skb, b - skb->data); + return -1; +} + +static 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 (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(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->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, + NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, + NULL, prefix); +} + +static int fib6_dump_node(struct fib6_walker_t *w) +{ + int res; + struct rt6_info *rt; + + for (rt = w->leaf; rt; rt = rt->u.next) { + res = rt6_dump_route(rt, w->args); + if (res < 0) { + /* Frame is full, suspend walking */ + w->leaf = rt; + return 1; + } + BUG_TRAP(res!=0); + } + w->leaf = NULL; + return 0; +} + +static void fib6_dump_end(struct netlink_callback *cb) +{ + struct fib6_walker_t *w = (void*)cb->args[0]; + + if (w) { + cb->args[0] = 0; + fib6_walker_unlink(w); + kfree(w); + } + if (cb->args[1]) { + cb->done = (void*)cb->args[1]; + cb->args[1] = 0; + } +} + +static int fib6_dump_done(struct netlink_callback *cb) +{ + fib6_dump_end(cb); + return cb->done(cb); +} + +int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct rt6_rtnl_dump_arg arg; + struct fib6_walker_t *w; + int res; + + arg.skb = skb; + arg.cb = cb; + + w = (void*)cb->args[0]; + if (w == NULL) { + /* New dump: + * + * 1. hook callback destructor. + */ + cb->args[1] = (long)cb->done; + cb->done = fib6_dump_done; + + /* + * 2. allocate and initialize walker. + */ + w = kmalloc(sizeof(*w), GFP_ATOMIC); + if (w == NULL) + return -ENOMEM; + RT6_TRACE("dump<%p", w); + memset(w, 0, sizeof(*w)); + w->root = &ip6_routing_table; + w->func = fib6_dump_node; + w->args = &arg; + cb->args[0] = (long)w; + read_lock_bh(&rt6_lock); + res = fib6_walk(w); + read_unlock_bh(&rt6_lock); + } else { + w->args = &arg; + read_lock_bh(&rt6_lock); + res = fib6_walk_continue(w); + read_unlock_bh(&rt6_lock); + } +#if RT6_DEBUG >= 3 + if (res <= 0 && skb->len == 0) + RT6_TRACE("%p>dump end\n", w); +#endif + res = res < 0 ? res : skb->len; + /* res < 0 is an error. (really, impossible) + res == 0 means that dump is complete, but skb still can contain data. + res > 0 dump is not complete, but frame is full. + */ + /* Destroy walker, if dump of this table is complete. */ + if (res <= 0) + fib6_dump_end(cb); + return res; +} + +int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) +{ + struct rtattr **rta = arg; + int iif = 0; + int err = -ENOBUFS; + struct sk_buff *skb; + struct flowi fl; + struct rt6_info *rt; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (skb == NULL) + goto out; + + /* Reserve room for dummy headers, this skb can pass + through good chunk of routing engine. + */ + skb->mac.raw = skb->data; + skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); + + memset(&fl, 0, sizeof(fl)); + if (rta[RTA_SRC-1]) + ipv6_addr_copy(&fl.fl6_src, + (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1])); + if (rta[RTA_DST-1]) + ipv6_addr_copy(&fl.fl6_dst, + (struct in6_addr*)RTA_DATA(rta[RTA_DST-1])); + + if (rta[RTA_IIF-1]) + memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); + + if (iif) { + struct net_device *dev; + dev = __dev_get_by_index(iif); + if (!dev) { + err = -ENODEV; + goto out_free; + } + } + + fl.oif = 0; + if (rta[RTA_OIF-1]) + memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); + + rt = (struct rt6_info*)ip6_route_output(NULL, &fl); + + skb->dst = &rt->u.dst; + + NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; + err = rt6_fill_node(skb, rt, + &fl.fl6_dst, &fl.fl6_src, + iif, + RTM_NEWROUTE, NETLINK_CB(in_skb).pid, + nlh->nlmsg_seq, nlh, 0); + if (err < 0) { + err = -EMSGSIZE; + goto out_free; + } + + err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); + if (err > 0) + err = 0; +out: + return err; +out_free: + kfree_skb(skb); + goto out; +} + +void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh) +{ + struct sk_buff *skb; + int size = NLMSG_SPACE(sizeof(struct rtmsg)+256); + + skb = alloc_skb(size, gfp_any()); + if (!skb) { + netlink_set_err(rtnl, 0, RTMGRP_IPV6_ROUTE, ENOBUFS); + return; + } + if (rt6_fill_node(skb, rt, NULL, NULL, 0, event, 0, 0, nlh, 0) < 0) { + kfree_skb(skb); + netlink_set_err(rtnl, 0, RTMGRP_IPV6_ROUTE, EINVAL); + return; + } + NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_ROUTE; + netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_ROUTE, gfp_any()); +} + +/* + * /proc + */ + +#ifdef CONFIG_PROC_FS + +#define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) + +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 rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; + int i; + + if (arg->skip < arg->offset / RT6_INFO_LEN) { + arg->skip++; + return 0; + } + + if (arg->len >= arg->length) + return 0; + + for (i=0; i<16; i++) { + sprintf(arg->buffer + arg->len, "%02x", + rt->rt6i_dst.addr.s6_addr[i]); + arg->len += 2; + } + arg->len += sprintf(arg->buffer + arg->len, " %02x ", + rt->rt6i_dst.plen); + +#ifdef CONFIG_IPV6_SUBTREES + for (i=0; i<16; i++) { + sprintf(arg->buffer + arg->len, "%02x", + rt->rt6i_src.addr.s6_addr[i]); + arg->len += 2; + } + arg->len += sprintf(arg->buffer + arg->len, " %02x ", + rt->rt6i_src.plen); +#else + sprintf(arg->buffer + arg->len, + "00000000000000000000000000000000 00 "); + arg->len += 36; +#endif + + if (rt->rt6i_nexthop) { + for (i=0; i<16; i++) { + sprintf(arg->buffer + arg->len, "%02x", + rt->rt6i_nexthop->primary_key[i]); + arg->len += 2; + } + } else { + sprintf(arg->buffer + arg->len, + "00000000000000000000000000000000"); + arg->len += 32; + } + arg->len += sprintf(arg->buffer + arg->len, + " %08x %08x %08x %08x %8s\n", + rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), + rt->u.dst.__use, rt->rt6i_flags, + rt->rt6i_dev ? rt->rt6i_dev->name : ""); + return 0; +} + +static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) +{ + struct rt6_proc_arg arg; + arg.buffer = buffer; + arg.offset = offset; + arg.length = length; + arg.skip = 0; + arg.len = 0; + + read_lock_bh(&rt6_lock); + fib6_clean_tree(&ip6_routing_table, rt6_info_route, 0, &arg); + read_unlock_bh(&rt6_lock); + + *start = buffer; + if (offset) + *start += offset % RT6_INFO_LEN; + + arg.len -= offset % RT6_INFO_LEN; + + if (arg.len > length) + arg.len = length; + if (arg.len < 0) + arg.len = 0; + + return arg.len; +} + +extern struct rt6_statistics rt6_stats; + +static int rt6_stats_seq_show(struct seq_file *seq, void *v) +{ + seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", + rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, + rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, + rt6_stats.fib_rt_cache, + atomic_read(&ip6_dst_ops.entries), + rt6_stats.fib_discarded_routes); + + return 0; +} + +static int rt6_stats_seq_open(struct inode *inode, struct file *file) +{ + return single_open(file, rt6_stats_seq_show, NULL); +} + +static struct file_operations rt6_stats_seq_fops = { + .owner = THIS_MODULE, + .open = rt6_stats_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; +#endif /* CONFIG_PROC_FS */ + +#ifdef CONFIG_SYSCTL + +static int flush_delay; + +static +int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + if (write) { + proc_dointvec(ctl, write, filp, buffer, lenp, ppos); + fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); + return 0; + } else + return -EINVAL; +} + +ctl_table ipv6_route_table[] = { + { + .ctl_name = NET_IPV6_ROUTE_FLUSH, + .procname = "flush", + .data = &flush_delay, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &ipv6_sysctl_rtcache_flush + }, + { + .ctl_name = NET_IPV6_ROUTE_GC_THRESH, + .procname = "gc_thresh", + .data = &ip6_dst_ops.gc_thresh, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, + .procname = "max_size", + .data = &ip6_rt_max_size, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, + .procname = "gc_min_interval", + .data = &ip6_rt_gc_min_interval, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + .strategy = &sysctl_jiffies, + }, + { + .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, + .procname = "gc_timeout", + .data = &ip6_rt_gc_timeout, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + .strategy = &sysctl_jiffies, + }, + { + .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, + .procname = "gc_interval", + .data = &ip6_rt_gc_interval, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + .strategy = &sysctl_jiffies, + }, + { + .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, + .procname = "gc_elasticity", + .data = &ip6_rt_gc_elasticity, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + .strategy = &sysctl_jiffies, + }, + { + .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, + .procname = "mtu_expires", + .data = &ip6_rt_mtu_expires, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + .strategy = &sysctl_jiffies, + }, + { + .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, + .procname = "min_adv_mss", + .data = &ip6_rt_min_advmss, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + .strategy = &sysctl_jiffies, + }, + { + .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, + .procname = "gc_min_interval_ms", + .data = &ip6_rt_gc_min_interval, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_ms_jiffies, + .strategy = &sysctl_ms_jiffies, + }, + { .ctl_name = 0 } +}; + +#endif + +void __init ip6_route_init(void) +{ + struct proc_dir_entry *p; + + ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache", + sizeof(struct rt6_info), + 0, SLAB_HWCACHE_ALIGN, + NULL, NULL); + if (!ip6_dst_ops.kmem_cachep) + panic("cannot create ip6_dst_cache"); + + fib6_init(); +#ifdef CONFIG_PROC_FS + p = proc_net_create("ipv6_route", 0, rt6_proc_info); + if (p) + p->owner = THIS_MODULE; + + proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); +#endif +#ifdef CONFIG_XFRM + xfrm6_init(); +#endif +} + +void ip6_route_cleanup(void) +{ +#ifdef CONFIG_PROC_FS + proc_net_remove("ipv6_route"); + proc_net_remove("rt6_stats"); +#endif +#ifdef CONFIG_XFRM + xfrm6_fini(); +#endif + rt6_ifdown(NULL); + fib6_gc_cleanup(); + kmem_cache_destroy(ip6_dst_ops.kmem_cachep); +} |
