X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=net%2Fipv6%2Froute.c;h=d1ddbc6ddac50907ea22983be8fdf3389967b39a;hb=193ba924524e6afe192217982b2c2d67e4715d33;hp=0ddf2d132e7f0840bcf327d4d0149fe2136fe943;hpb=c32f38619af6302da58835fb292b159bdd96d11f;p=uclinux-h8%2Flinux.git diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 0ddf2d132e7f..d1ddbc6ddac5 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -222,11 +222,11 @@ static const u32 ip6_template_metrics[RTAX_MAX] = { [RTAX_HOPLIMIT - 1] = 255, }; -static struct rt6_info ip6_null_entry_template = { +static const struct rt6_info ip6_null_entry_template = { .dst = { .__refcnt = ATOMIC_INIT(1), .__use = 1, - .obsolete = -1, + .obsolete = DST_OBSOLETE_FORCE_CHK, .error = -ENETUNREACH, .input = ip6_pkt_discard, .output = ip6_pkt_discard_out, @@ -242,11 +242,11 @@ static struct rt6_info ip6_null_entry_template = { static int ip6_pkt_prohibit(struct sk_buff *skb); static int ip6_pkt_prohibit_out(struct sk_buff *skb); -static struct rt6_info ip6_prohibit_entry_template = { +static const struct rt6_info ip6_prohibit_entry_template = { .dst = { .__refcnt = ATOMIC_INIT(1), .__use = 1, - .obsolete = -1, + .obsolete = DST_OBSOLETE_FORCE_CHK, .error = -EACCES, .input = ip6_pkt_prohibit, .output = ip6_pkt_prohibit_out, @@ -257,11 +257,11 @@ static struct rt6_info ip6_prohibit_entry_template = { .rt6i_ref = ATOMIC_INIT(1), }; -static struct rt6_info ip6_blk_hole_entry_template = { +static const struct rt6_info ip6_blk_hole_entry_template = { .dst = { .__refcnt = ATOMIC_INIT(1), .__use = 1, - .obsolete = -1, + .obsolete = DST_OBSOLETE_FORCE_CHK, .error = -EINVAL, .input = dst_discard, .output = dst_discard, @@ -281,13 +281,14 @@ static inline struct rt6_info *ip6_dst_alloc(struct net *net, struct fib6_table *table) { struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, - 0, DST_OBSOLETE_NONE, flags); + 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(net); } return rt; } @@ -369,15 +370,11 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, static bool rt6_check_expired(const struct rt6_info *rt) { - struct rt6_info *ort = NULL; - if (rt->rt6i_flags & RTF_EXPIRES) { if (time_after(jiffies, rt->dst.expires)) return true; } else if (rt->dst.from) { - ort = (struct rt6_info *) rt->dst.from; - return (ort->rt6i_flags & RTF_EXPIRES) && - time_after(jiffies, ort->dst.expires); + return rt6_check_expired((struct rt6_info *) rt->dst.from); } return false; } @@ -451,10 +448,9 @@ static void rt6_probe(struct rt6_info *rt) * Router Reachability Probe MUST be rate-limited * to no more than one per minute. */ - rcu_read_lock(); neigh = rt ? rt->n : NULL; if (!neigh || (neigh->nud_state & NUD_VALID)) - goto out; + return; read_lock_bh(&neigh->lock); if (!(neigh->nud_state & NUD_VALID) && time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { @@ -470,8 +466,6 @@ static void rt6_probe(struct rt6_info *rt) } else { read_unlock_bh(&neigh->lock); } -out: - rcu_read_unlock(); } #else static inline void rt6_probe(struct rt6_info *rt) @@ -498,7 +492,6 @@ static inline int rt6_check_neigh(struct rt6_info *rt) struct neighbour *neigh; int m; - rcu_read_lock(); neigh = rt->n; if (rt->rt6i_flags & RTF_NONEXTHOP || !(rt->rt6i_flags & RTF_GATEWAY)) @@ -516,7 +509,6 @@ static inline int rt6_check_neigh(struct rt6_info *rt) read_unlock_bh(&neigh->lock); } else m = 0; - rcu_read_unlock(); return m; } @@ -1031,6 +1023,13 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) 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(dev_net(rt->dst.dev))) + return NULL; + if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { if (rt->rt6i_peer_genid != rt6_peer_genid()) { if (!rt6_has_peer(rt)) @@ -1397,8 +1396,6 @@ int ip6_route_add(struct fib6_config *cfg) goto out; } - rt->dst.obsolete = -1; - if (cfg->fc_flags & RTF_EXPIRES) rt6_set_expires(rt, jiffies + clock_t_to_jiffies(cfg->fc_expires)); @@ -1463,8 +1460,21 @@ int ip6_route_add(struct fib6_config *cfg) } rt->dst.output = ip6_pkt_discard_out; rt->dst.input = ip6_pkt_discard; - rt->dst.error = -ENETUNREACH; 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; } @@ -1829,7 +1839,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net, if (!table) return NULL; - write_lock_bh(&table->tb6_lock); + read_lock_bh(&table->tb6_lock); fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); if (!fn) goto out; @@ -1845,7 +1855,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net, break; } out: - write_unlock_bh(&table->tb6_lock); + read_unlock_bh(&table->tb6_lock); return rt; } @@ -1861,7 +1871,7 @@ static struct rt6_info *rt6_add_route_info(struct net *net, .fc_dst_len = prefixlen, .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | RTF_UP | RTF_PREF(pref), - .fc_nlinfo.pid = 0, + .fc_nlinfo.portid = 0, .fc_nlinfo.nlh = NULL, .fc_nlinfo.nl_net = net, }; @@ -1888,7 +1898,7 @@ struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_dev if (!table) return NULL; - write_lock_bh(&table->tb6_lock); + 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)) && @@ -1897,7 +1907,7 @@ struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_dev } if (rt) dst_hold(&rt->dst); - write_unlock_bh(&table->tb6_lock); + read_unlock_bh(&table->tb6_lock); return rt; } @@ -1911,7 +1921,7 @@ struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, .fc_ifindex = dev->ifindex, .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), - .fc_nlinfo.pid = 0, + .fc_nlinfo.portid = 0, .fc_nlinfo.nlh = NULL, .fc_nlinfo.nl_net = dev_net(dev), }; @@ -2080,7 +2090,6 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, rt->dst.input = ip6_input; rt->dst.output = ip6_output; rt->rt6i_idev = idev; - rt->dst.obsolete = -1; rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; if (anycast) @@ -2261,14 +2270,18 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, 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) + 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.pid = NETLINK_CB(skb).pid; + cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; cfg->fc_nlinfo.nlh = nlh; cfg->fc_nlinfo.nl_net = sock_net(skb->sk); @@ -2359,7 +2372,7 @@ static inline size_t rt6_nlmsg_size(void) static int rt6_fill_node(struct net *net, struct sk_buff *skb, struct rt6_info *rt, struct in6_addr *dst, struct in6_addr *src, - int iif, int type, u32 pid, u32 seq, + int iif, int type, u32 portid, u32 seq, int prefix, int nowait, unsigned int flags) { struct rtmsg *rtm; @@ -2375,7 +2388,7 @@ static int rt6_fill_node(struct net *net, } } - nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); + nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); if (!nlh) return -EMSGSIZE; @@ -2391,8 +2404,22 @@ static int rt6_fill_node(struct net *net, rtm->rtm_table = table; if (nla_put_u32(skb, RTA_TABLE, table)) goto nla_put_failure; - if (rt->rt6i_flags & RTF_REJECT) - rtm->rtm_type = RTN_UNREACHABLE; + 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)) @@ -2465,15 +2492,11 @@ static int rt6_fill_node(struct net *net, if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) goto nla_put_failure; - rcu_read_lock(); n = rt->n; if (n) { - if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) { - rcu_read_unlock(); + if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) goto nla_put_failure; - } } - rcu_read_unlock(); if (rt->dst.dev && nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) @@ -2506,7 +2529,7 @@ int rt6_dump_route(struct rt6_info *rt, void *p_arg) return rt6_fill_node(arg->net, arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, - NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, + NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, prefix, 0, NLM_F_MULTI); } @@ -2586,14 +2609,14 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void skb_dst_set(skb, &rt->dst); err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, - RTM_NEWROUTE, NETLINK_CB(in_skb).pid, + 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).pid); + err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); errout: return err; } @@ -2613,14 +2636,14 @@ void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) goto errout; err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, - event, info->pid, seq, 0, 0, 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->pid, RTNLGRP_IPV6_ROUTE, + rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, info->nlh, gfp_any()); return; errout: @@ -2675,14 +2698,12 @@ static int rt6_info_route(struct rt6_info *rt, void *p_arg) #else seq_puts(m, "00000000000000000000000000000000 00 "); #endif - rcu_read_lock(); n = rt->n; if (n) { seq_printf(m, "%pi6", n->primary_key); } else { seq_puts(m, "00000000000000000000000000000000"); } - rcu_read_unlock(); seq_printf(m, " %08x %08x %08x %08x %8s\n", rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), rt->dst.__use, rt->rt6i_flags,