| /* |
| * 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. |
| */ |
| |
| #define pr_fmt(fmt) "IPv6: " fmt |
| |
| #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 <net/nexthop.h> |
| |
| #include <asm/uaccess.h> |
| |
| #ifdef CONFIG_SYSCTL |
| #include <linux/sysctl.h> |
| #endif |
| |
| enum rt6_nud_state { |
| RT6_NUD_FAIL_HARD = -2, |
| RT6_NUD_FAIL_SOFT = -1, |
| RT6_NUD_SUCCEED = 1 |
| }; |
| |
| 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, struct sock *sk, |
| struct sk_buff *skb, u32 mtu); |
| static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, |
| struct sk_buff *skb); |
| static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
| |
| #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 int 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 NULL; |
| |
| peer = rt6_get_peer_create(rt); |
| 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, |
| struct sk_buff *skb, |
| const void *daddr) |
| { |
| struct in6_addr *p = &rt->rt6i_gateway; |
| |
| if (!ipv6_addr_any(p)) |
| return (const void *) p; |
| else if (skb) |
| return &ipv6_hdr(skb)->daddr; |
| return daddr; |
| } |
| |
| static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
| struct sk_buff *skb, |
| const void *daddr) |
| { |
| struct rt6_info *rt = (struct rt6_info *) dst; |
| struct neighbour *n; |
| |
| daddr = choose_neigh_daddr(rt, skb, daddr); |
| n = __ipv6_neigh_lookup(dst->dev, daddr); |
| if (n) |
| return n; |
| return neigh_create(&nd_tbl, daddr, dst->dev); |
| } |
| |
| 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, |
| .redirect = rt6_do_redirect, |
| .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, struct sock *sk, |
| struct sk_buff *skb, u32 mtu) |
| { |
| } |
| |
| static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
| struct sk_buff *skb) |
| { |
| } |
| |
| 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, |
| .redirect = ip6_rt_blackhole_redirect, |
| .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 const struct rt6_info ip6_null_entry_template = { |
| .dst = { |
| .__refcnt = ATOMIC_INIT(1), |
| .__use = 1, |
| .obsolete = DST_OBSOLETE_FORCE_CHK, |
| .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 const struct rt6_info ip6_prohibit_entry_template = { |
| .dst = { |
| .__refcnt = ATOMIC_INIT(1), |
| .__use = 1, |
| .obsolete = DST_OBSOLETE_FORCE_CHK, |
| .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 const struct rt6_info ip6_blk_hole_entry_template = { |
| .dst = { |
| .__refcnt = ATOMIC_INIT(1), |
| .__use = 1, |
| .obsolete = DST_OBSOLETE_FORCE_CHK, |
| .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 net *net, |
| struct net_device *dev, |
| int flags, |
| struct fib6_table *table) |
| { |
| struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
| 0, DST_OBSOLETE_FORCE_CHK, flags); |
| |
| if (rt) { |
| struct dst_entry *dst = &rt->dst; |
| |
| memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); |
| rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
| rt->rt6i_genid = rt_genid_ipv6(net); |
| INIT_LIST_HEAD(&rt->rt6i_siblings); |
| } |
| 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 dst_entry *from = dst->from; |
| |
| if (!(rt->dst.flags & DST_HOST)) |
| dst_destroy_metrics_generic(dst); |
| |
| if (idev) { |
| rt->rt6i_idev = NULL; |
| in6_dev_put(idev); |
| } |
| |
| dst->from = NULL; |
| dst_release(from); |
| |
| if (rt6_has_peer(rt)) { |
| struct inet_peer *peer = rt6_peer_ptr(rt); |
| inet_putpeer(peer); |
| } |
| } |
| |
| void rt6_bind_peer(struct rt6_info *rt, int create) |
| { |
| struct inet_peer_base *base; |
| struct inet_peer *peer; |
| |
| base = inetpeer_base_ptr(rt->_rt6i_peer); |
| if (!base) |
| return; |
| |
| peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); |
| if (peer) { |
| if (!rt6_set_peer(rt, peer)) |
| inet_putpeer(peer); |
| } |
| } |
| |
| 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) { |
| if (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 bool rt6_check_expired(const struct rt6_info *rt) |
| { |
| if (rt->rt6i_flags & RTF_EXPIRES) { |
| if (time_after(jiffies, rt->dst.expires)) |
| return true; |
| } else if (rt->dst.from) { |
| return rt6_check_expired((struct rt6_info *) rt->dst.from); |
| } |
| return false; |
| } |
| |
| static bool rt6_need_strict(const struct in6_addr *daddr) |
| { |
| return ipv6_addr_type(daddr) & |
| (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); |
| } |
| |
| /* Multipath route selection: |
| * Hash based function using packet header and flowlabel. |
| * Adapted from fib_info_hashfn() |
| */ |
| static int rt6_info_hash_nhsfn(unsigned int candidate_count, |
| const struct flowi6 *fl6) |
| { |
| unsigned int val = fl6->flowi6_proto; |
| |
| val ^= ipv6_addr_hash(&fl6->daddr); |
| val ^= ipv6_addr_hash(&fl6->saddr); |
| |
| /* Work only if this not encapsulated */ |
| switch (fl6->flowi6_proto) { |
| case IPPROTO_UDP: |
| case IPPROTO_TCP: |
| case IPPROTO_SCTP: |
| val ^= (__force u16)fl6->fl6_sport; |
| val ^= (__force u16)fl6->fl6_dport; |
| break; |
| |
| case IPPROTO_ICMPV6: |
| val ^= (__force u16)fl6->fl6_icmp_type; |
| val ^= (__force u16)fl6->fl6_icmp_code; |
| break; |
| } |
| /* RFC6438 recommands to use flowlabel */ |
| val ^= (__force u32)fl6->flowlabel; |
| |
| /* Perhaps, we need to tune, this function? */ |
| val = val ^ (val >> 7) ^ (val >> 12); |
| return val % candidate_count; |
| } |
| |
| static struct rt6_info *rt6_multipath_select(struct rt6_info *match, |
| struct flowi6 *fl6, int oif, |
| int strict) |
| { |
| struct rt6_info *sibling, *next_sibling; |
| int route_choosen; |
| |
| route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); |
| /* Don't change the route, if route_choosen == 0 |
| * (siblings does not include ourself) |
| */ |
| if (route_choosen) |
| list_for_each_entry_safe(sibling, next_sibling, |
| &match->rt6i_siblings, rt6i_siblings) { |
| route_choosen--; |
| if (route_choosen == 0) { |
| if (rt6_score_route(sibling, oif, strict) < 0) |
| break; |
| match = sibling; |
| break; |
| } |
| } |
| return match; |
| } |
| |
| /* |
| * 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 |
| struct __rt6_probe_work { |
| struct work_struct work; |
| struct in6_addr target; |
| struct net_device *dev; |
| }; |
| |
| static void rt6_probe_deferred(struct work_struct *w) |
| { |
| struct in6_addr mcaddr; |
| struct __rt6_probe_work *work = |
| container_of(w, struct __rt6_probe_work, work); |
| |
| addrconf_addr_solict_mult(&work->target, &mcaddr); |
| ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL); |
| dev_put(work->dev); |
| kfree(w); |
| } |
| |
| 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. |
| */ |
| if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
| return; |
| rcu_read_lock_bh(); |
| neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); |
| if (neigh) { |
| write_lock(&neigh->lock); |
| if (neigh->nud_state & NUD_VALID) |
| goto out; |
| } |
| |
| if (!neigh || |
| time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
| struct __rt6_probe_work *work; |
| |
| work = kmalloc(sizeof(*work), GFP_ATOMIC); |
| |
| if (neigh && work) |
| neigh->updated = jiffies; |
| |
| if (neigh) |
| write_unlock(&neigh->lock); |
| |
| if (work) { |
| INIT_WORK(&work->work, rt6_probe_deferred); |
| work->target = rt->rt6i_gateway; |
| dev_hold(rt->dst.dev); |
| work->dev = rt->dst.dev; |
| schedule_work(&work->work); |
| } |
| } else { |
| out: |
| write_unlock(&neigh->lock); |
| } |
| rcu_read_unlock_bh(); |
| } |
| #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 enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
| { |
| struct neighbour *neigh; |
| enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
| |
| if (rt->rt6i_flags & RTF_NONEXTHOP || |
| !(rt->rt6i_flags & RTF_GATEWAY)) |
| return RT6_NUD_SUCCEED; |
| |
| rcu_read_lock_bh(); |
| neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); |
| if (neigh) { |
| read_lock(&neigh->lock); |
| if (neigh->nud_state & NUD_VALID) |
| ret = RT6_NUD_SUCCEED; |
| #ifdef CONFIG_IPV6_ROUTER_PREF |
| else if (!(neigh->nud_state & NUD_FAILED)) |
| ret = RT6_NUD_SUCCEED; |
| #endif |
| read_unlock(&neigh->lock); |
| } else { |
| ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? |
| RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT; |
| } |
| rcu_read_unlock_bh(); |
| |
| return ret; |
| } |
| |
| static int rt6_score_route(struct rt6_info *rt, int oif, |
| int strict) |
| { |
| int m; |
| |
| m = rt6_check_dev(rt, oif); |
| if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
| return RT6_NUD_FAIL_HARD; |
| #ifdef CONFIG_IPV6_ROUTER_PREF |
| m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; |
| #endif |
| if (strict & RT6_LOOKUP_F_REACHABLE) { |
| int n = rt6_check_neigh(rt); |
| if (n < 0) |
| return n; |
| } |
| return m; |
| } |
| |
| static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
| int *mpri, struct rt6_info *match, |
| bool *do_rr) |
| { |
| int m; |
| bool match_do_rr = false; |
| |
| if (rt6_check_expired(rt)) |
| goto out; |
| |
| m = rt6_score_route(rt, oif, strict); |
| if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) { |
| match_do_rr = true; |
| m = 0; /* lowest valid score */ |
| } else if (m < 0) { |
| goto out; |
| } |
| |
| if (strict & RT6_LOOKUP_F_REACHABLE) |
| rt6_probe(rt); |
| |
| if (m > *mpri) { |
| *do_rr = match_do_rr; |
| *mpri = m; |
| match = 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, |
| bool *do_rr) |
| { |
| 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, do_rr); |
| 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, do_rr); |
| |
| return match; |
| } |
| |
| static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
| { |
| struct rt6_info *match, *rt0; |
| struct net *net; |
| bool do_rr = false; |
| |
| rt0 = fn->rr_ptr; |
| if (!rt0) |
| fn->rr_ptr = rt0 = fn->leaf; |
| |
| match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
| &do_rr); |
| |
| if (do_rr) { |
| 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; |
| } |
| |
| 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); |
| |
| ip6_rt_put(rt); |
| } |
| 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); |
| if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
| rt = rt6_multipath_select(rt, fl6, 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) { |
| 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_flags |= RTF_CACHE; |
| |
| #ifdef CONFIG_IPV6_SUBTREES |
| if (rt->rt6i_src.plen && saddr) { |
| rt->rt6i_src.addr = *saddr; |
| rt->rt6i_src.plen = 128; |
| } |
| #endif |
| } |
| |
| 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; |
| return rt; |
| } |
| |
| static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
| struct flowi6 *fl6, int flags) |
| { |
| 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; |
| |
| strict |= flags & RT6_LOOKUP_F_IFACE; |
| |
| 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); |
| if (rt->rt6i_nsiblings) |
| rt = rt6_multipath_select(rt, fl6, 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 (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) |
| 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; |
| |
| ip6_rt_put(rt); |
| 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. |
| */ |
| ip6_rt_put(rt); |
| 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); |
| } |
| |
| 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 = ip6_flowinfo(iph), |
| .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); |
| } |
| |
| struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
| struct flowi6 *fl6) |
| { |
| int flags = 0; |
| |
| fl6->flowi6_iif = LOOPBACK_IFINDEX; |
| |
| 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, DST_OBSOLETE_NONE, 0); |
| if (rt) { |
| new = &rt->dst; |
| |
| memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
| rt6_init_peer(rt, net->ipv6.peers); |
| |
| 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; |
| 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; |
| |
| /* All IPV6 dsts are created with ->obsolete set to the value |
| * DST_OBSOLETE_FORCE_CHK which forces validation calls down |
| * into this function always. |
| */ |
| if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev))) |
| return NULL; |
| |
| if (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) { |
| 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, struct sock *sk, |
| struct sk_buff *skb, u32 mtu) |
| { |
| struct rt6_info *rt6 = (struct rt6_info*)dst; |
| |
| dst_confirm(dst); |
| if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
| struct net *net = dev_net(dst->dev); |
| |
| 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); |
| rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
| } |
| } |
| |
| void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
| int oif, u32 mark) |
| { |
| const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; |
| struct dst_entry *dst; |
| struct flowi6 fl6; |
| |
| memset(&fl6, 0, sizeof(fl6)); |
| fl6.flowi6_oif = oif; |
| fl6.flowi6_mark = mark; |
| fl6.flowi6_flags = 0; |
| fl6.daddr = iph->daddr; |
| fl6.saddr = iph->saddr; |
| fl6.flowlabel = ip6_flowinfo(iph); |
| |
| dst = ip6_route_output(net, NULL, &fl6); |
| if (!dst->error) |
| ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); |
| dst_release(dst); |
| } |
| EXPORT_SYMBOL_GPL(ip6_update_pmtu); |
| |
| void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) |
| { |
| ip6_update_pmtu(skb, sock_net(sk), mtu, |
| sk->sk_bound_dev_if, sk->sk_mark); |
| } |
| EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); |
| |
| /* 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 4861 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) { |
| if (rt6_check_expired(rt)) |
| continue; |
| if (rt->dst.error) |
| break; |
| 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; |
| else if (rt->dst.error) { |
| rt = net->ipv6.ip6_null_entry; |
| goto out; |
| } |
| BACKTRACK(net, &fl6->saddr); |
| out: |
| dst_hold(&rt->dst); |
| |
| read_unlock_bh(&table->tb6_lock); |
| |
| return rt; |
| }; |
| |
| static struct dst_entry *ip6_route_redirect(struct net *net, |
| const struct flowi6 *fl6, |
| const struct in6_addr *gateway) |
| { |
| int flags = RT6_LOOKUP_F_HAS_SADDR; |
| struct ip6rd_flowi rdfl; |
| |
| rdfl.fl6 = *fl6; |
| rdfl.gateway = *gateway; |
| |
| return fib6_rule_lookup(net, &rdfl.fl6, |
| flags, __ip6_route_redirect); |
| } |
| |
| void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
| { |
| const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; |
| struct dst_entry *dst; |
| struct flowi6 fl6; |
| |
| memset(&fl6, 0, sizeof(fl6)); |
| fl6.flowi6_oif = oif; |
| fl6.flowi6_mark = mark; |
| fl6.flowi6_flags = 0; |
| fl6.daddr = iph->daddr; |
| fl6.saddr = iph->saddr; |
| fl6.flowlabel = ip6_flowinfo(iph); |
| |
| dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
| rt6_do_redirect(dst, NULL, skb); |
| dst_release(dst); |
| } |
| EXPORT_SYMBOL_GPL(ip6_redirect); |
| |
| void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
| u32 mark) |
| { |
| const struct ipv6hdr *iph = ipv6_hdr(skb); |
| const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); |
| struct dst_entry *dst; |
| struct flowi6 fl6; |
| |
| memset(&fl6, 0, sizeof(fl6)); |
| fl6.flowi6_oif = oif; |
| fl6.flowi6_mark = mark; |
| fl6.flowi6_flags = 0; |
| fl6.daddr = msg->dest; |
| fl6.saddr = iph->daddr; |
| |
| dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
| rt6_do_redirect(dst, NULL, skb); |
| dst_release(dst); |
| } |
| |
| void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
| { |
| ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); |
| } |
| EXPORT_SYMBOL_GPL(ip6_sk_redirect); |
| |
| 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) |
| return mtu; |
| |
| mtu = IPV6_MIN_MTU; |
| |
| rcu_read_lock(); |
| idev = __in6_dev_get(dst->dev); |
| if (idev) |
| mtu = idev->cnf.mtu6; |
| rcu_read_unlock(); |
| |
| return 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 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, dev, 0, NULL); |
| if (unlikely(!rt)) { |
| in6_dev_put(idev); |
| dst = ERR_PTR(-ENOMEM); |
| goto out; |
| } |
| |
| rt->dst.flags |= DST_HOST; |
| rt->dst.output = ip6_output; |
| atomic_set(&rt->dst.__refcnt, 1); |
| rt->rt6i_gateway = fl6->daddr; |
| 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) |
| { |
| 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, jiffies) && |
| entries <= rt_max_size) |
| goto out; |
| |
| net->ipv6.ip6_rt_gc_expire++; |
| fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size); |
| 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; |
| } |
| |
| /* |
| * |
| */ |
| |
| 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) { |
| pr_warn("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, NULL, DST_NOCOUNT, table); |
| |
| if (!rt) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| 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->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
| switch (cfg->fc_type) { |
| case RTN_BLACKHOLE: |
| rt->dst.error = -EINVAL; |
| break; |
| case RTN_PROHIBIT: |
| rt->dst.error = -EACCES; |
| break; |
| case RTN_THROW: |
| rt->dst.error = -EAGAIN; |
| break; |
| default: |
| rt->dst.error = -ENETUNREACH; |
| break; |
| } |
| 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) { |
| ip6_rt_put(grt); |
| 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; |
| ip6_rt_put(grt); |
| |
| 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; |
| |
| 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: |
| ip6_rt_put(rt); |
| 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; |
| } |
| |
| static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
| { |
| struct net *net = dev_net(skb->dev); |
| struct netevent_redirect netevent; |
| struct rt6_info *rt, *nrt = NULL; |
| struct ndisc_options ndopts; |
| struct inet6_dev *in6_dev; |
| struct neighbour *neigh; |
| struct rd_msg *msg; |
| int optlen, on_link; |
| u8 *lladdr; |
| |
| optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
| optlen -= sizeof(*msg); |
| |
| if (optlen < 0) { |
| net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
| return; |
| } |
| |
| msg = (struct rd_msg *)icmp6_hdr(skb); |
| |
| if (ipv6_addr_is_multicast(&msg->dest)) { |
| net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
| return; |
| } |
| |
| on_link = 0; |
| if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
| on_link = 1; |
| } else if (ipv6_addr_type(&msg->target) != |
| (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
| net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
| return; |
| } |
| |
| in6_dev = __in6_dev_get(skb->dev); |
| if (!in6_dev) |
| return; |
| if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) |
| return; |
| |
| /* RFC2461 8.1: |
| * The IP source address of the Redirect MUST be the same as the current |
| * first-hop router for the specified ICMP Destination Address. |
| */ |
| |
| if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
| net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
| return; |
| } |
| |
| lladdr = NULL; |
| if (ndopts.nd_opts_tgt_lladdr) { |
| lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, |
| skb->dev); |
| if (!lladdr) { |
| net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); |
| return; |
| } |
| } |
| |
| rt = (struct rt6_info *) dst; |
| if (rt == net->ipv6.ip6_null_entry) { |
| net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
| return; |
| } |
| |
| /* 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); |
| |
| neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
| if (!neigh) |
| return; |
| |
| /* |
| * 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)) |
| ); |
| |
| nrt = ip6_rt_copy(rt, &msg->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; |
| |
| if (ip6_ins_rt(nrt)) |
| goto out; |
| |
| netevent.old = &rt->dst; |
| netevent.new = &nrt->dst; |
| netevent.daddr = &msg->dest; |
| netevent.neigh = neigh; |
| call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
| |
| if (rt->rt6i_flags & RTF_CACHE) { |
| rt = (struct rt6_info *) dst_clone(&rt->dst); |
| ip6_del_rt(rt); |
| } |
| |
| out: |
| neigh_release(neigh); |
| } |
| |
| /* |
| * 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, ort->dst.dev, 0, |
| ort->rt6i_table); |
| |
| 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; |
| |
| if (ort->rt6i_flags & RTF_GATEWAY) |
| rt->rt6i_gateway = ort->rt6i_gateway; |
| else |
| rt->rt6i_gateway = *dest; |
| rt->rt6i_flags = ort->rt6i_flags; |
| if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == |
| (RTF_DEFAULT | RTF_ADDRCONF)) |
| rt6_set_from(rt, ort); |
| 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; |
| |
| read_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: |
| read_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 int 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.portid = 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; |
| |
| read_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); |
| read_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.portid = 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 (!ns_capable(net->user_ns, 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, net->loopback_dev, 0, NULL); |
| |
| if (!rt) { |
| net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); |
| 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->rt6i_flags = RTF_UP | RTF_NONEXTHOP; |
| if (anycast) |
| rt->rt6i_flags |= RTF_ANYCAST; |
| else |
| rt->rt6i_flags |= RTF_LOCAL; |
| |
| rt->rt6i_gateway = *addr; |
| 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 int 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 int 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 }, |
| [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
| }; |
| |
| 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; |
| cfg->fc_type = rtm->rtm_type; |
| |
| if (rtm->rtm_type == RTN_UNREACHABLE || |
| rtm->rtm_type == RTN_BLACKHOLE || |
| rtm->rtm_type == RTN_PROHIBIT || |
| rtm->rtm_type == RTN_THROW) |
| cfg->fc_flags |= RTF_REJECT; |
| |
| if (rtm->rtm_type == RTN_LOCAL) |
| cfg->fc_flags |= RTF_LOCAL; |
| |
| cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
| 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]); |
| |
| if (tb[RTA_MULTIPATH]) { |
| cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); |
| cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); |
| } |
| |
| err = 0; |
| errout: |
| return err; |
| } |
| |
| static int ip6_route_multipath(struct fib6_config *cfg, int add) |
| { |
| struct fib6_config r_cfg; |
| struct rtnexthop *rtnh; |
| int remaining; |
| int attrlen; |
| int err = 0, last_err = 0; |
| |
| beginning: |
| rtnh = (struct rtnexthop *)cfg->fc_mp; |
| remaining = cfg->fc_mp_len; |
| |
| /* Parse a Multipath Entry */ |
| while (rtnh_ok(rtnh, remaining)) { |
| memcpy(&r_cfg, cfg, sizeof(*cfg)); |
| if (rtnh->rtnh_ifindex) |
| r_cfg.fc_ifindex = rtnh->rtnh_ifindex; |
| |
| attrlen = rtnh_attrlen(rtnh); |
| if (attrlen > 0) { |
| struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
| |
| nla = nla_find(attrs, attrlen, RTA_GATEWAY); |
| if (nla) { |
| nla_memcpy(&r_cfg.fc_gateway, nla, 16); |
| r_cfg.fc_flags |= RTF_GATEWAY; |
| } |
| } |
| err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); |
| if (err) { |
| last_err = err; |
| /* If we are trying to remove a route, do not stop the |
| * loop when ip6_route_del() fails (because next hop is |
| * already gone), we should try to remove all next hops. |
| */ |
| if (add) { |
| /* If add fails, we should try to delete all |
| * next hops that have been already added. |
| */ |
| add = 0; |
| goto beginning; |
| } |
| } |
| /* Because each route is added like a single route we remove |
| * this flag after the first nexthop (if there is a collision, |
| * we have already fail to add the first nexthop: |
| * fib6_add_rt2node() has reject it). |
| */ |
| cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; |
| rtnh = rtnh_next(rtnh, &remaining); |
| } |
| |
| return last_err; |
| } |
| |
| static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh) |
| { |
| struct fib6_config cfg; |
| int err; |
| |
| err = rtm_to_fib6_config(skb, nlh, &cfg); |
| if (err < 0) |
| return err; |
| |
| if (cfg.fc_mp) |
| return ip6_route_multipath(&cfg, 0); |
| else |
| return ip6_route_del(&cfg); |
| } |
| |
| static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh) |
| { |
| struct fib6_config cfg; |
| int err; |
| |
| err = rtm_to_fib6_config(skb, nlh, &cfg); |
| if (err < 0) |
| return err; |
| |
| if (cfg.fc_mp) |
| return ip6_route_multipath(&cfg, 1); |
| else |
| 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 portid, u32 seq, |
| int prefix, int nowait, unsigned int flags) |
| { |
| struct rtmsg *rtm; |
| struct nlmsghdr *nlh; |
| long expires; |
| u32 table; |
| |
| 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, portid, 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; |
| if (nla_put_u32(skb, RTA_TABLE, table)) |
| goto nla_put_failure; |
| if (rt->rt6i_flags & RTF_REJECT) { |
| switch (rt->dst.error) { |
| case -EINVAL: |
| rtm->rtm_type = RTN_BLACKHOLE; |
| break; |
| case -EACCES: |
| rtm->rtm_type = RTN_PROHIBIT; |
| break; |
| case -EAGAIN: |
| rtm->rtm_type = RTN_THROW; |
| break; |
| default: |
| rtm->rtm_type = RTN_UNREACHABLE; |
| break; |
| } |
| } |
| 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; |
| 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) { |
| if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) |
| rtm->rtm_protocol = RTPROT_RA; |
| else |
| rtm->rtm_protocol = RTPROT_KERNEL; |
| } |
| |
| if (rt->rt6i_flags & RTF_CACHE) |
| rtm->rtm_flags |= RTM_F_CLONED; |
| |
| if (dst) { |
| if (nla_put(skb, RTA_DST, 16, dst)) |
| goto nla_put_failure; |
| rtm->rtm_dst_len = 128; |
| } else if (rtm->rtm_dst_len) |
| if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
| goto nla_put_failure; |
| #ifdef CONFIG_IPV6_SUBTREES |
| if (src) { |
| if (nla_put(skb, RTA_SRC, 16, src)) |
| goto nla_put_failure; |
| rtm->rtm_src_len = 128; |
| } else if (rtm->rtm_src_len && |
| nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) |
| goto nla_put_failure; |
| #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 |
| if (nla_put_u32(skb, RTA_IIF, iif)) |
| goto nla_put_failure; |
| } 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)) |
| goto nla_put_failure; |
| } |
| |
| if (rt->rt6i_prefsrc.plen) { |
| struct in6_addr saddr_buf; |
| saddr_buf = rt->rt6i_prefsrc.addr; |
| if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
| goto nla_put_failure; |
| } |
| |
| if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
| goto nla_put_failure; |
| |
| if (rt->rt6i_flags & RTF_GATEWAY) { |
| if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0) |
| goto nla_put_failure; |
| } |
| |
| if (rt->dst.dev && |
| nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) |
| goto nla_put_failure; |
| if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) |
| goto nla_put_failure; |
| |
| expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; |
| |
| if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 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).portid, arg->cb->nlh->nlmsg_seq, |
| prefix, 0, NLM_F_MULTI); |
| } |
| |
| static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh) |
| { |
| 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) { |
| ip6_rt_put(rt); |
| 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).portid, |
| nlh->nlmsg_seq, 0, 0, 0); |
| if (err < 0) { |
| kfree_skb(skb); |
| goto errout; |
| } |
| |
| err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
| 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->portid, seq, 0, 0, 0); |
| if (err < 0) { |
| /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ |
| WARN_ON(err == -EMSGSIZE); |
| kfree_skb(skb); |
| goto errout; |
| } |
| rtnl_notify(skb, net, info->portid, 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 *ptr) |
| { |
| struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 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 |
| } |
| |
| 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; |
| |
| 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 |
| if (rt->rt6i_flags & RTF_GATEWAY) { |
| seq_printf(m, "%pi6", &rt->rt6i_gateway); |
| } else { |
| seq_puts(m, "00000000000000000000000000000000"); |
| } |
| 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(struct 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 ? 0 : (unsigned long)delay, net, delay > 0); |
| return 0; |
| } |
| |
| struct 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; |
| |
| /* Don't export sysctls to unprivileged users */ |
| if (net->user_ns != &init_user_ns) |
| table[0].procname = NULL; |
| } |
| |
| 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_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
| proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); |
| #endif |
| return 0; |
| } |
| |
| static void __net_exit ip6_route_net_exit_late(struct net *net) |
| { |
| #ifdef CONFIG_PROC_FS |
| remove_proc_entry("ipv6_route", net->proc_net); |
| remove_proc_entry("rt6_stats", net->proc_net); |
| #endif |
| } |
| |
| static struct pernet_operations ip6_route_net_ops = { |
| .init = ip6_route_net_init, |
| .exit = ip6_route_net_exit, |
| }; |
| |
| static int __net_init ipv6_inetpeer_init(struct net *net) |
| { |
| struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); |
| |
| if (!bp) |
| return -ENOMEM; |
| inet_peer_base_init(bp); |
| net->ipv6.peers = bp; |
| return 0; |
| } |
| |
| static void __net_exit ipv6_inetpeer_exit(struct net *net) |
| { |
| struct inet_peer_base *bp = net->ipv6.peers; |
| |
| net->ipv6.peers = NULL; |
| inetpeer_invalidate_tree(bp); |
| kfree(bp); |
| } |
| |
| static struct pernet_operations ipv6_inetpeer_ops = { |
| .init = ipv6_inetpeer_init, |
| .exit = ipv6_inetpeer_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(&ipv6_inetpeer_ops); |
| if (ret) |
| goto out_dst_entries; |
| |
| ret = register_pernet_subsys(&ip6_route_net_ops); |
| if (ret) |
| goto out_register_inetpeer; |
| |
| 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_register_inetpeer: |
| unregister_pernet_subsys(&ipv6_inetpeer_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(&ipv6_inetpeer_ops); |
| unregister_pernet_subsys(&ip6_route_net_ops); |
| dst_entries_destroy(&ip6_dst_blackhole_ops); |
| kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
| } |