mirror of https://gitee.com/openkylin/linux.git
2504 lines
57 KiB
C
2504 lines
57 KiB
C
/*
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* Linux IPv6 multicast routing support for BSD pim6sd
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* Based on net/ipv4/ipmr.c.
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*
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* (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
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* LSIIT Laboratory, Strasbourg, France
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* (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
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* 6WIND, Paris, France
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* Copyright (C)2007,2008 USAGI/WIDE Project
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* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <asm/uaccess.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/socket.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/compat.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/raw.h>
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#include <linux/notifier.h>
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#include <linux/if_arp.h>
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#include <net/checksum.h>
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#include <net/netlink.h>
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#include <net/fib_rules.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#include <linux/mroute6.h>
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#include <linux/pim.h>
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#include <net/addrconf.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/export.h>
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#include <net/ip6_checksum.h>
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#include <linux/netconf.h>
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struct mr6_table {
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struct list_head list;
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#ifdef CONFIG_NET_NS
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struct net *net;
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#endif
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u32 id;
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struct sock *mroute6_sk;
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struct timer_list ipmr_expire_timer;
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struct list_head mfc6_unres_queue;
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struct list_head mfc6_cache_array[MFC6_LINES];
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struct mif_device vif6_table[MAXMIFS];
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int maxvif;
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atomic_t cache_resolve_queue_len;
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bool mroute_do_assert;
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bool mroute_do_pim;
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#ifdef CONFIG_IPV6_PIMSM_V2
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int mroute_reg_vif_num;
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#endif
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};
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struct ip6mr_rule {
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struct fib_rule common;
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};
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struct ip6mr_result {
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struct mr6_table *mrt;
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};
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/* Big lock, protecting vif table, mrt cache and mroute socket state.
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Note that the changes are semaphored via rtnl_lock.
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*/
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static DEFINE_RWLOCK(mrt_lock);
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/*
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* Multicast router control variables
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*/
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#define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL)
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/* Special spinlock for queue of unresolved entries */
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static DEFINE_SPINLOCK(mfc_unres_lock);
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/* We return to original Alan's scheme. Hash table of resolved
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entries is changed only in process context and protected
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with weak lock mrt_lock. Queue of unresolved entries is protected
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with strong spinlock mfc_unres_lock.
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In this case data path is free of exclusive locks at all.
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*/
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static struct kmem_cache *mrt_cachep __read_mostly;
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static struct mr6_table *ip6mr_new_table(struct net *net, u32 id);
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static void ip6mr_free_table(struct mr6_table *mrt);
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static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
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struct sk_buff *skb, struct mfc6_cache *cache);
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static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
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mifi_t mifi, int assert);
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static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
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struct mfc6_cache *c, struct rtmsg *rtm);
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static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
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int cmd);
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static int ip6mr_rtm_dumproute(struct sk_buff *skb,
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struct netlink_callback *cb);
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static void mroute_clean_tables(struct mr6_table *mrt);
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static void ipmr_expire_process(unsigned long arg);
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#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
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#define ip6mr_for_each_table(mrt, net) \
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list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
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static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
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{
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struct mr6_table *mrt;
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ip6mr_for_each_table(mrt, net) {
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if (mrt->id == id)
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return mrt;
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}
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return NULL;
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}
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static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
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struct mr6_table **mrt)
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{
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int err;
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struct ip6mr_result res;
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struct fib_lookup_arg arg = {
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.result = &res,
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.flags = FIB_LOOKUP_NOREF,
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};
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err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
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flowi6_to_flowi(flp6), 0, &arg);
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if (err < 0)
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return err;
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*mrt = res.mrt;
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return 0;
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}
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static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
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int flags, struct fib_lookup_arg *arg)
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{
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struct ip6mr_result *res = arg->result;
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struct mr6_table *mrt;
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switch (rule->action) {
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case FR_ACT_TO_TBL:
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break;
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case FR_ACT_UNREACHABLE:
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return -ENETUNREACH;
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case FR_ACT_PROHIBIT:
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return -EACCES;
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case FR_ACT_BLACKHOLE:
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default:
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return -EINVAL;
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}
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mrt = ip6mr_get_table(rule->fr_net, rule->table);
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if (mrt == NULL)
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return -EAGAIN;
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res->mrt = mrt;
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return 0;
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}
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static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
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{
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return 1;
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}
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static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
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FRA_GENERIC_POLICY,
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};
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static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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struct fib_rule_hdr *frh, struct nlattr **tb)
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{
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return 0;
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}
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static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
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struct nlattr **tb)
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{
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return 1;
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}
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static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
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struct fib_rule_hdr *frh)
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{
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frh->dst_len = 0;
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frh->src_len = 0;
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frh->tos = 0;
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return 0;
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}
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static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
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.family = RTNL_FAMILY_IP6MR,
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.rule_size = sizeof(struct ip6mr_rule),
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.addr_size = sizeof(struct in6_addr),
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.action = ip6mr_rule_action,
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.match = ip6mr_rule_match,
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.configure = ip6mr_rule_configure,
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.compare = ip6mr_rule_compare,
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.default_pref = fib_default_rule_pref,
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.fill = ip6mr_rule_fill,
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.nlgroup = RTNLGRP_IPV6_RULE,
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.policy = ip6mr_rule_policy,
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.owner = THIS_MODULE,
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};
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static int __net_init ip6mr_rules_init(struct net *net)
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{
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struct fib_rules_ops *ops;
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struct mr6_table *mrt;
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int err;
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ops = fib_rules_register(&ip6mr_rules_ops_template, net);
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if (IS_ERR(ops))
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return PTR_ERR(ops);
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INIT_LIST_HEAD(&net->ipv6.mr6_tables);
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mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
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if (mrt == NULL) {
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err = -ENOMEM;
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goto err1;
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}
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err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
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if (err < 0)
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goto err2;
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net->ipv6.mr6_rules_ops = ops;
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return 0;
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err2:
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kfree(mrt);
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err1:
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fib_rules_unregister(ops);
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return err;
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}
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static void __net_exit ip6mr_rules_exit(struct net *net)
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{
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struct mr6_table *mrt, *next;
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rtnl_lock();
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list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
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list_del(&mrt->list);
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ip6mr_free_table(mrt);
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}
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rtnl_unlock();
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fib_rules_unregister(net->ipv6.mr6_rules_ops);
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}
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#else
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#define ip6mr_for_each_table(mrt, net) \
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for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
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static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
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{
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return net->ipv6.mrt6;
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}
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static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
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struct mr6_table **mrt)
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{
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*mrt = net->ipv6.mrt6;
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return 0;
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}
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static int __net_init ip6mr_rules_init(struct net *net)
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{
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net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
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return net->ipv6.mrt6 ? 0 : -ENOMEM;
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}
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static void __net_exit ip6mr_rules_exit(struct net *net)
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{
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rtnl_lock();
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ip6mr_free_table(net->ipv6.mrt6);
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net->ipv6.mrt6 = NULL;
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rtnl_unlock();
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}
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#endif
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static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
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{
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struct mr6_table *mrt;
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unsigned int i;
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mrt = ip6mr_get_table(net, id);
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if (mrt != NULL)
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return mrt;
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mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
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if (mrt == NULL)
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return NULL;
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mrt->id = id;
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write_pnet(&mrt->net, net);
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/* Forwarding cache */
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for (i = 0; i < MFC6_LINES; i++)
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INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]);
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INIT_LIST_HEAD(&mrt->mfc6_unres_queue);
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setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
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(unsigned long)mrt);
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#ifdef CONFIG_IPV6_PIMSM_V2
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mrt->mroute_reg_vif_num = -1;
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#endif
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#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
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list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
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#endif
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return mrt;
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}
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static void ip6mr_free_table(struct mr6_table *mrt)
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{
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del_timer(&mrt->ipmr_expire_timer);
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mroute_clean_tables(mrt);
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kfree(mrt);
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}
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#ifdef CONFIG_PROC_FS
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struct ipmr_mfc_iter {
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struct seq_net_private p;
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struct mr6_table *mrt;
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struct list_head *cache;
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int ct;
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};
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static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
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struct ipmr_mfc_iter *it, loff_t pos)
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{
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struct mr6_table *mrt = it->mrt;
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struct mfc6_cache *mfc;
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read_lock(&mrt_lock);
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for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) {
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it->cache = &mrt->mfc6_cache_array[it->ct];
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list_for_each_entry(mfc, it->cache, list)
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if (pos-- == 0)
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return mfc;
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}
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read_unlock(&mrt_lock);
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spin_lock_bh(&mfc_unres_lock);
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it->cache = &mrt->mfc6_unres_queue;
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list_for_each_entry(mfc, it->cache, list)
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if (pos-- == 0)
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return mfc;
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spin_unlock_bh(&mfc_unres_lock);
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it->cache = NULL;
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return NULL;
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}
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/*
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* The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
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*/
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struct ipmr_vif_iter {
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struct seq_net_private p;
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struct mr6_table *mrt;
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int ct;
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};
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static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
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struct ipmr_vif_iter *iter,
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loff_t pos)
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{
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struct mr6_table *mrt = iter->mrt;
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for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
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if (!MIF_EXISTS(mrt, iter->ct))
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continue;
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if (pos-- == 0)
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return &mrt->vif6_table[iter->ct];
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}
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return NULL;
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}
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static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(mrt_lock)
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{
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struct ipmr_vif_iter *iter = seq->private;
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struct net *net = seq_file_net(seq);
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struct mr6_table *mrt;
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mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
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if (mrt == NULL)
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return ERR_PTR(-ENOENT);
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iter->mrt = mrt;
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read_lock(&mrt_lock);
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return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
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: SEQ_START_TOKEN;
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}
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static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct ipmr_vif_iter *iter = seq->private;
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struct net *net = seq_file_net(seq);
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struct mr6_table *mrt = iter->mrt;
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++*pos;
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if (v == SEQ_START_TOKEN)
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return ip6mr_vif_seq_idx(net, iter, 0);
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while (++iter->ct < mrt->maxvif) {
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if (!MIF_EXISTS(mrt, iter->ct))
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continue;
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return &mrt->vif6_table[iter->ct];
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}
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return NULL;
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}
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static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
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__releases(mrt_lock)
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{
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read_unlock(&mrt_lock);
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}
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static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
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{
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struct ipmr_vif_iter *iter = seq->private;
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struct mr6_table *mrt = iter->mrt;
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq,
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"Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
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} else {
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const struct mif_device *vif = v;
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const char *name = vif->dev ? vif->dev->name : "none";
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seq_printf(seq,
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"%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
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vif - mrt->vif6_table,
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name, vif->bytes_in, vif->pkt_in,
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vif->bytes_out, vif->pkt_out,
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vif->flags);
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}
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return 0;
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}
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static const struct seq_operations ip6mr_vif_seq_ops = {
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.start = ip6mr_vif_seq_start,
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.next = ip6mr_vif_seq_next,
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.stop = ip6mr_vif_seq_stop,
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.show = ip6mr_vif_seq_show,
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};
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|
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static int ip6mr_vif_open(struct inode *inode, struct file *file)
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{
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return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
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sizeof(struct ipmr_vif_iter));
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}
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|
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static const struct file_operations ip6mr_vif_fops = {
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.owner = THIS_MODULE,
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.open = ip6mr_vif_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_net,
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};
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|
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static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
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{
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struct ipmr_mfc_iter *it = seq->private;
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struct net *net = seq_file_net(seq);
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struct mr6_table *mrt;
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|
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mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
|
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if (mrt == NULL)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
it->mrt = mrt;
|
|
return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
|
|
: SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct mfc6_cache *mfc = v;
|
|
struct ipmr_mfc_iter *it = seq->private;
|
|
struct net *net = seq_file_net(seq);
|
|
struct mr6_table *mrt = it->mrt;
|
|
|
|
++*pos;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
return ipmr_mfc_seq_idx(net, seq->private, 0);
|
|
|
|
if (mfc->list.next != it->cache)
|
|
return list_entry(mfc->list.next, struct mfc6_cache, list);
|
|
|
|
if (it->cache == &mrt->mfc6_unres_queue)
|
|
goto end_of_list;
|
|
|
|
BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]);
|
|
|
|
while (++it->ct < MFC6_LINES) {
|
|
it->cache = &mrt->mfc6_cache_array[it->ct];
|
|
if (list_empty(it->cache))
|
|
continue;
|
|
return list_first_entry(it->cache, struct mfc6_cache, list);
|
|
}
|
|
|
|
/* exhausted cache_array, show unresolved */
|
|
read_unlock(&mrt_lock);
|
|
it->cache = &mrt->mfc6_unres_queue;
|
|
it->ct = 0;
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
if (!list_empty(it->cache))
|
|
return list_first_entry(it->cache, struct mfc6_cache, list);
|
|
|
|
end_of_list:
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
it->cache = NULL;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
struct ipmr_mfc_iter *it = seq->private;
|
|
struct mr6_table *mrt = it->mrt;
|
|
|
|
if (it->cache == &mrt->mfc6_unres_queue)
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
else if (it->cache == mrt->mfc6_cache_array)
|
|
read_unlock(&mrt_lock);
|
|
}
|
|
|
|
static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
int n;
|
|
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(seq,
|
|
"Group "
|
|
"Origin "
|
|
"Iif Pkts Bytes Wrong Oifs\n");
|
|
} else {
|
|
const struct mfc6_cache *mfc = v;
|
|
const struct ipmr_mfc_iter *it = seq->private;
|
|
struct mr6_table *mrt = it->mrt;
|
|
|
|
seq_printf(seq, "%pI6 %pI6 %-3hd",
|
|
&mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
|
|
mfc->mf6c_parent);
|
|
|
|
if (it->cache != &mrt->mfc6_unres_queue) {
|
|
seq_printf(seq, " %8lu %8lu %8lu",
|
|
mfc->mfc_un.res.pkt,
|
|
mfc->mfc_un.res.bytes,
|
|
mfc->mfc_un.res.wrong_if);
|
|
for (n = mfc->mfc_un.res.minvif;
|
|
n < mfc->mfc_un.res.maxvif; n++) {
|
|
if (MIF_EXISTS(mrt, n) &&
|
|
mfc->mfc_un.res.ttls[n] < 255)
|
|
seq_printf(seq,
|
|
" %2d:%-3d",
|
|
n, mfc->mfc_un.res.ttls[n]);
|
|
}
|
|
} else {
|
|
/* unresolved mfc_caches don't contain
|
|
* pkt, bytes and wrong_if values
|
|
*/
|
|
seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
|
|
}
|
|
seq_putc(seq, '\n');
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations ipmr_mfc_seq_ops = {
|
|
.start = ipmr_mfc_seq_start,
|
|
.next = ipmr_mfc_seq_next,
|
|
.stop = ipmr_mfc_seq_stop,
|
|
.show = ipmr_mfc_seq_show,
|
|
};
|
|
|
|
static int ipmr_mfc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
|
|
sizeof(struct ipmr_mfc_iter));
|
|
}
|
|
|
|
static const struct file_operations ip6mr_mfc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ipmr_mfc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
|
|
static int pim6_rcv(struct sk_buff *skb)
|
|
{
|
|
struct pimreghdr *pim;
|
|
struct ipv6hdr *encap;
|
|
struct net_device *reg_dev = NULL;
|
|
struct net *net = dev_net(skb->dev);
|
|
struct mr6_table *mrt;
|
|
struct flowi6 fl6 = {
|
|
.flowi6_iif = skb->dev->ifindex,
|
|
.flowi6_mark = skb->mark,
|
|
};
|
|
int reg_vif_num;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
|
|
goto drop;
|
|
|
|
pim = (struct pimreghdr *)skb_transport_header(skb);
|
|
if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
|
|
(pim->flags & PIM_NULL_REGISTER) ||
|
|
(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
|
|
sizeof(*pim), IPPROTO_PIM,
|
|
csum_partial((void *)pim, sizeof(*pim), 0)) &&
|
|
csum_fold(skb_checksum(skb, 0, skb->len, 0))))
|
|
goto drop;
|
|
|
|
/* check if the inner packet is destined to mcast group */
|
|
encap = (struct ipv6hdr *)(skb_transport_header(skb) +
|
|
sizeof(*pim));
|
|
|
|
if (!ipv6_addr_is_multicast(&encap->daddr) ||
|
|
encap->payload_len == 0 ||
|
|
ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
|
|
goto drop;
|
|
|
|
if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
|
|
goto drop;
|
|
reg_vif_num = mrt->mroute_reg_vif_num;
|
|
|
|
read_lock(&mrt_lock);
|
|
if (reg_vif_num >= 0)
|
|
reg_dev = mrt->vif6_table[reg_vif_num].dev;
|
|
if (reg_dev)
|
|
dev_hold(reg_dev);
|
|
read_unlock(&mrt_lock);
|
|
|
|
if (reg_dev == NULL)
|
|
goto drop;
|
|
|
|
skb->mac_header = skb->network_header;
|
|
skb_pull(skb, (u8 *)encap - skb->data);
|
|
skb_reset_network_header(skb);
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
|
|
|
|
netif_rx(skb);
|
|
|
|
dev_put(reg_dev);
|
|
return 0;
|
|
drop:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static const struct inet6_protocol pim6_protocol = {
|
|
.handler = pim6_rcv,
|
|
};
|
|
|
|
/* Service routines creating virtual interfaces: PIMREG */
|
|
|
|
static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct mr6_table *mrt;
|
|
struct flowi6 fl6 = {
|
|
.flowi6_oif = dev->ifindex,
|
|
.flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
|
|
.flowi6_mark = skb->mark,
|
|
};
|
|
int err;
|
|
|
|
err = ip6mr_fib_lookup(net, &fl6, &mrt);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
read_lock(&mrt_lock);
|
|
dev->stats.tx_bytes += skb->len;
|
|
dev->stats.tx_packets++;
|
|
ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
|
|
read_unlock(&mrt_lock);
|
|
kfree_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static const struct net_device_ops reg_vif_netdev_ops = {
|
|
.ndo_start_xmit = reg_vif_xmit,
|
|
};
|
|
|
|
static void reg_vif_setup(struct net_device *dev)
|
|
{
|
|
dev->type = ARPHRD_PIMREG;
|
|
dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
|
|
dev->flags = IFF_NOARP;
|
|
dev->netdev_ops = ®_vif_netdev_ops;
|
|
dev->destructor = free_netdev;
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
}
|
|
|
|
static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
|
|
{
|
|
struct net_device *dev;
|
|
char name[IFNAMSIZ];
|
|
|
|
if (mrt->id == RT6_TABLE_DFLT)
|
|
sprintf(name, "pim6reg");
|
|
else
|
|
sprintf(name, "pim6reg%u", mrt->id);
|
|
|
|
dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
|
|
if (dev == NULL)
|
|
return NULL;
|
|
|
|
dev_net_set(dev, net);
|
|
|
|
if (register_netdevice(dev)) {
|
|
free_netdev(dev);
|
|
return NULL;
|
|
}
|
|
dev->iflink = 0;
|
|
|
|
if (dev_open(dev))
|
|
goto failure;
|
|
|
|
dev_hold(dev);
|
|
return dev;
|
|
|
|
failure:
|
|
/* allow the register to be completed before unregistering. */
|
|
rtnl_unlock();
|
|
rtnl_lock();
|
|
|
|
unregister_netdevice(dev);
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Delete a VIF entry
|
|
*/
|
|
|
|
static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
|
|
{
|
|
struct mif_device *v;
|
|
struct net_device *dev;
|
|
struct inet6_dev *in6_dev;
|
|
|
|
if (vifi < 0 || vifi >= mrt->maxvif)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
v = &mrt->vif6_table[vifi];
|
|
|
|
write_lock_bh(&mrt_lock);
|
|
dev = v->dev;
|
|
v->dev = NULL;
|
|
|
|
if (!dev) {
|
|
write_unlock_bh(&mrt_lock);
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (vifi == mrt->mroute_reg_vif_num)
|
|
mrt->mroute_reg_vif_num = -1;
|
|
#endif
|
|
|
|
if (vifi + 1 == mrt->maxvif) {
|
|
int tmp;
|
|
for (tmp = vifi - 1; tmp >= 0; tmp--) {
|
|
if (MIF_EXISTS(mrt, tmp))
|
|
break;
|
|
}
|
|
mrt->maxvif = tmp + 1;
|
|
}
|
|
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
dev_set_allmulti(dev, -1);
|
|
|
|
in6_dev = __in6_dev_get(dev);
|
|
if (in6_dev) {
|
|
in6_dev->cnf.mc_forwarding--;
|
|
inet6_netconf_notify_devconf(dev_net(dev),
|
|
NETCONFA_MC_FORWARDING,
|
|
dev->ifindex, &in6_dev->cnf);
|
|
}
|
|
|
|
if (v->flags & MIFF_REGISTER)
|
|
unregister_netdevice_queue(dev, head);
|
|
|
|
dev_put(dev);
|
|
return 0;
|
|
}
|
|
|
|
static inline void ip6mr_cache_free(struct mfc6_cache *c)
|
|
{
|
|
kmem_cache_free(mrt_cachep, c);
|
|
}
|
|
|
|
/* Destroy an unresolved cache entry, killing queued skbs
|
|
and reporting error to netlink readers.
|
|
*/
|
|
|
|
static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
|
|
{
|
|
struct net *net = read_pnet(&mrt->net);
|
|
struct sk_buff *skb;
|
|
|
|
atomic_dec(&mrt->cache_resolve_queue_len);
|
|
|
|
while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
|
|
if (ipv6_hdr(skb)->version == 0) {
|
|
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
|
|
nlh->nlmsg_type = NLMSG_ERROR;
|
|
nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
|
|
skb_trim(skb, nlh->nlmsg_len);
|
|
((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
|
|
rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
|
|
} else
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
ip6mr_cache_free(c);
|
|
}
|
|
|
|
|
|
/* Timer process for all the unresolved queue. */
|
|
|
|
static void ipmr_do_expire_process(struct mr6_table *mrt)
|
|
{
|
|
unsigned long now = jiffies;
|
|
unsigned long expires = 10 * HZ;
|
|
struct mfc6_cache *c, *next;
|
|
|
|
list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
|
|
if (time_after(c->mfc_un.unres.expires, now)) {
|
|
/* not yet... */
|
|
unsigned long interval = c->mfc_un.unres.expires - now;
|
|
if (interval < expires)
|
|
expires = interval;
|
|
continue;
|
|
}
|
|
|
|
list_del(&c->list);
|
|
mr6_netlink_event(mrt, c, RTM_DELROUTE);
|
|
ip6mr_destroy_unres(mrt, c);
|
|
}
|
|
|
|
if (!list_empty(&mrt->mfc6_unres_queue))
|
|
mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
|
|
}
|
|
|
|
static void ipmr_expire_process(unsigned long arg)
|
|
{
|
|
struct mr6_table *mrt = (struct mr6_table *)arg;
|
|
|
|
if (!spin_trylock(&mfc_unres_lock)) {
|
|
mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
|
|
return;
|
|
}
|
|
|
|
if (!list_empty(&mrt->mfc6_unres_queue))
|
|
ipmr_do_expire_process(mrt);
|
|
|
|
spin_unlock(&mfc_unres_lock);
|
|
}
|
|
|
|
/* Fill oifs list. It is called under write locked mrt_lock. */
|
|
|
|
static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
|
|
unsigned char *ttls)
|
|
{
|
|
int vifi;
|
|
|
|
cache->mfc_un.res.minvif = MAXMIFS;
|
|
cache->mfc_un.res.maxvif = 0;
|
|
memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
|
|
|
|
for (vifi = 0; vifi < mrt->maxvif; vifi++) {
|
|
if (MIF_EXISTS(mrt, vifi) &&
|
|
ttls[vifi] && ttls[vifi] < 255) {
|
|
cache->mfc_un.res.ttls[vifi] = ttls[vifi];
|
|
if (cache->mfc_un.res.minvif > vifi)
|
|
cache->mfc_un.res.minvif = vifi;
|
|
if (cache->mfc_un.res.maxvif <= vifi)
|
|
cache->mfc_un.res.maxvif = vifi + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int mif6_add(struct net *net, struct mr6_table *mrt,
|
|
struct mif6ctl *vifc, int mrtsock)
|
|
{
|
|
int vifi = vifc->mif6c_mifi;
|
|
struct mif_device *v = &mrt->vif6_table[vifi];
|
|
struct net_device *dev;
|
|
struct inet6_dev *in6_dev;
|
|
int err;
|
|
|
|
/* Is vif busy ? */
|
|
if (MIF_EXISTS(mrt, vifi))
|
|
return -EADDRINUSE;
|
|
|
|
switch (vifc->mif6c_flags) {
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
case MIFF_REGISTER:
|
|
/*
|
|
* Special Purpose VIF in PIM
|
|
* All the packets will be sent to the daemon
|
|
*/
|
|
if (mrt->mroute_reg_vif_num >= 0)
|
|
return -EADDRINUSE;
|
|
dev = ip6mr_reg_vif(net, mrt);
|
|
if (!dev)
|
|
return -ENOBUFS;
|
|
err = dev_set_allmulti(dev, 1);
|
|
if (err) {
|
|
unregister_netdevice(dev);
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
break;
|
|
#endif
|
|
case 0:
|
|
dev = dev_get_by_index(net, vifc->mif6c_pifi);
|
|
if (!dev)
|
|
return -EADDRNOTAVAIL;
|
|
err = dev_set_allmulti(dev, 1);
|
|
if (err) {
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
in6_dev = __in6_dev_get(dev);
|
|
if (in6_dev) {
|
|
in6_dev->cnf.mc_forwarding++;
|
|
inet6_netconf_notify_devconf(dev_net(dev),
|
|
NETCONFA_MC_FORWARDING,
|
|
dev->ifindex, &in6_dev->cnf);
|
|
}
|
|
|
|
/*
|
|
* Fill in the VIF structures
|
|
*/
|
|
v->rate_limit = vifc->vifc_rate_limit;
|
|
v->flags = vifc->mif6c_flags;
|
|
if (!mrtsock)
|
|
v->flags |= VIFF_STATIC;
|
|
v->threshold = vifc->vifc_threshold;
|
|
v->bytes_in = 0;
|
|
v->bytes_out = 0;
|
|
v->pkt_in = 0;
|
|
v->pkt_out = 0;
|
|
v->link = dev->ifindex;
|
|
if (v->flags & MIFF_REGISTER)
|
|
v->link = dev->iflink;
|
|
|
|
/* And finish update writing critical data */
|
|
write_lock_bh(&mrt_lock);
|
|
v->dev = dev;
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (v->flags & MIFF_REGISTER)
|
|
mrt->mroute_reg_vif_num = vifi;
|
|
#endif
|
|
if (vifi + 1 > mrt->maxvif)
|
|
mrt->maxvif = vifi + 1;
|
|
write_unlock_bh(&mrt_lock);
|
|
return 0;
|
|
}
|
|
|
|
static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
|
|
const struct in6_addr *origin,
|
|
const struct in6_addr *mcastgrp)
|
|
{
|
|
int line = MFC6_HASH(mcastgrp, origin);
|
|
struct mfc6_cache *c;
|
|
|
|
list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
|
|
if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
|
|
ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
|
|
return c;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Look for a (*,*,oif) entry */
|
|
static struct mfc6_cache *ip6mr_cache_find_any_parent(struct mr6_table *mrt,
|
|
mifi_t mifi)
|
|
{
|
|
int line = MFC6_HASH(&in6addr_any, &in6addr_any);
|
|
struct mfc6_cache *c;
|
|
|
|
list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
|
|
if (ipv6_addr_any(&c->mf6c_origin) &&
|
|
ipv6_addr_any(&c->mf6c_mcastgrp) &&
|
|
(c->mfc_un.res.ttls[mifi] < 255))
|
|
return c;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Look for a (*,G) entry */
|
|
static struct mfc6_cache *ip6mr_cache_find_any(struct mr6_table *mrt,
|
|
struct in6_addr *mcastgrp,
|
|
mifi_t mifi)
|
|
{
|
|
int line = MFC6_HASH(mcastgrp, &in6addr_any);
|
|
struct mfc6_cache *c, *proxy;
|
|
|
|
if (ipv6_addr_any(mcastgrp))
|
|
goto skip;
|
|
|
|
list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
|
|
if (ipv6_addr_any(&c->mf6c_origin) &&
|
|
ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) {
|
|
if (c->mfc_un.res.ttls[mifi] < 255)
|
|
return c;
|
|
|
|
/* It's ok if the mifi is part of the static tree */
|
|
proxy = ip6mr_cache_find_any_parent(mrt,
|
|
c->mf6c_parent);
|
|
if (proxy && proxy->mfc_un.res.ttls[mifi] < 255)
|
|
return c;
|
|
}
|
|
|
|
skip:
|
|
return ip6mr_cache_find_any_parent(mrt, mifi);
|
|
}
|
|
|
|
/*
|
|
* Allocate a multicast cache entry
|
|
*/
|
|
static struct mfc6_cache *ip6mr_cache_alloc(void)
|
|
{
|
|
struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
|
|
if (c == NULL)
|
|
return NULL;
|
|
c->mfc_un.res.minvif = MAXMIFS;
|
|
return c;
|
|
}
|
|
|
|
static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
|
|
{
|
|
struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
|
|
if (c == NULL)
|
|
return NULL;
|
|
skb_queue_head_init(&c->mfc_un.unres.unresolved);
|
|
c->mfc_un.unres.expires = jiffies + 10 * HZ;
|
|
return c;
|
|
}
|
|
|
|
/*
|
|
* A cache entry has gone into a resolved state from queued
|
|
*/
|
|
|
|
static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
|
|
struct mfc6_cache *uc, struct mfc6_cache *c)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
/*
|
|
* Play the pending entries through our router
|
|
*/
|
|
|
|
while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
|
|
if (ipv6_hdr(skb)->version == 0) {
|
|
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
|
|
|
|
if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
|
|
} else {
|
|
nlh->nlmsg_type = NLMSG_ERROR;
|
|
nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
|
|
skb_trim(skb, nlh->nlmsg_len);
|
|
((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
|
|
}
|
|
rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
|
|
} else
|
|
ip6_mr_forward(net, mrt, skb, c);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
|
|
* expects the following bizarre scheme.
|
|
*
|
|
* Called under mrt_lock.
|
|
*/
|
|
|
|
static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
|
|
mifi_t mifi, int assert)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct mrt6msg *msg;
|
|
int ret;
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (assert == MRT6MSG_WHOLEPKT)
|
|
skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
|
|
+sizeof(*msg));
|
|
else
|
|
#endif
|
|
skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
|
|
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
/* I suppose that internal messages
|
|
* do not require checksums */
|
|
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (assert == MRT6MSG_WHOLEPKT) {
|
|
/* Ugly, but we have no choice with this interface.
|
|
Duplicate old header, fix length etc.
|
|
And all this only to mangle msg->im6_msgtype and
|
|
to set msg->im6_mbz to "mbz" :-)
|
|
*/
|
|
skb_push(skb, -skb_network_offset(pkt));
|
|
|
|
skb_push(skb, sizeof(*msg));
|
|
skb_reset_transport_header(skb);
|
|
msg = (struct mrt6msg *)skb_transport_header(skb);
|
|
msg->im6_mbz = 0;
|
|
msg->im6_msgtype = MRT6MSG_WHOLEPKT;
|
|
msg->im6_mif = mrt->mroute_reg_vif_num;
|
|
msg->im6_pad = 0;
|
|
msg->im6_src = ipv6_hdr(pkt)->saddr;
|
|
msg->im6_dst = ipv6_hdr(pkt)->daddr;
|
|
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
} else
|
|
#endif
|
|
{
|
|
/*
|
|
* Copy the IP header
|
|
*/
|
|
|
|
skb_put(skb, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(skb);
|
|
skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
|
|
|
|
/*
|
|
* Add our header
|
|
*/
|
|
skb_put(skb, sizeof(*msg));
|
|
skb_reset_transport_header(skb);
|
|
msg = (struct mrt6msg *)skb_transport_header(skb);
|
|
|
|
msg->im6_mbz = 0;
|
|
msg->im6_msgtype = assert;
|
|
msg->im6_mif = mifi;
|
|
msg->im6_pad = 0;
|
|
msg->im6_src = ipv6_hdr(pkt)->saddr;
|
|
msg->im6_dst = ipv6_hdr(pkt)->daddr;
|
|
|
|
skb_dst_set(skb, dst_clone(skb_dst(pkt)));
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
}
|
|
|
|
if (mrt->mroute6_sk == NULL) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Deliver to user space multicast routing algorithms
|
|
*/
|
|
ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
|
|
if (ret < 0) {
|
|
net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Queue a packet for resolution. It gets locked cache entry!
|
|
*/
|
|
|
|
static int
|
|
ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
|
|
{
|
|
bool found = false;
|
|
int err;
|
|
struct mfc6_cache *c;
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
|
|
if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
|
|
ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
/*
|
|
* Create a new entry if allowable
|
|
*/
|
|
|
|
if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
|
|
(c = ip6mr_cache_alloc_unres()) == NULL) {
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
kfree_skb(skb);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
/*
|
|
* Fill in the new cache entry
|
|
*/
|
|
c->mf6c_parent = -1;
|
|
c->mf6c_origin = ipv6_hdr(skb)->saddr;
|
|
c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
|
|
|
|
/*
|
|
* Reflect first query at pim6sd
|
|
*/
|
|
err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
|
|
if (err < 0) {
|
|
/* If the report failed throw the cache entry
|
|
out - Brad Parker
|
|
*/
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
ip6mr_cache_free(c);
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
atomic_inc(&mrt->cache_resolve_queue_len);
|
|
list_add(&c->list, &mrt->mfc6_unres_queue);
|
|
mr6_netlink_event(mrt, c, RTM_NEWROUTE);
|
|
|
|
ipmr_do_expire_process(mrt);
|
|
}
|
|
|
|
/*
|
|
* See if we can append the packet
|
|
*/
|
|
if (c->mfc_un.unres.unresolved.qlen > 3) {
|
|
kfree_skb(skb);
|
|
err = -ENOBUFS;
|
|
} else {
|
|
skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
|
|
err = 0;
|
|
}
|
|
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* MFC6 cache manipulation by user space
|
|
*/
|
|
|
|
static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc,
|
|
int parent)
|
|
{
|
|
int line;
|
|
struct mfc6_cache *c, *next;
|
|
|
|
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
|
|
|
|
list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
|
|
if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
|
|
ipv6_addr_equal(&c->mf6c_mcastgrp,
|
|
&mfc->mf6cc_mcastgrp.sin6_addr) &&
|
|
(parent == -1 || parent == c->mf6c_parent)) {
|
|
write_lock_bh(&mrt_lock);
|
|
list_del(&c->list);
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
mr6_netlink_event(mrt, c, RTM_DELROUTE);
|
|
ip6mr_cache_free(c);
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int ip6mr_device_event(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);
|
|
struct mr6_table *mrt;
|
|
struct mif_device *v;
|
|
int ct;
|
|
LIST_HEAD(list);
|
|
|
|
if (event != NETDEV_UNREGISTER)
|
|
return NOTIFY_DONE;
|
|
|
|
ip6mr_for_each_table(mrt, net) {
|
|
v = &mrt->vif6_table[0];
|
|
for (ct = 0; ct < mrt->maxvif; ct++, v++) {
|
|
if (v->dev == dev)
|
|
mif6_delete(mrt, ct, &list);
|
|
}
|
|
}
|
|
unregister_netdevice_many(&list);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block ip6_mr_notifier = {
|
|
.notifier_call = ip6mr_device_event
|
|
};
|
|
|
|
/*
|
|
* Setup for IP multicast routing
|
|
*/
|
|
|
|
static int __net_init ip6mr_net_init(struct net *net)
|
|
{
|
|
int err;
|
|
|
|
err = ip6mr_rules_init(net);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
err = -ENOMEM;
|
|
if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops))
|
|
goto proc_vif_fail;
|
|
if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops))
|
|
goto proc_cache_fail;
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_cache_fail:
|
|
remove_proc_entry("ip6_mr_vif", net->proc_net);
|
|
proc_vif_fail:
|
|
ip6mr_rules_exit(net);
|
|
#endif
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit ip6mr_net_exit(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
remove_proc_entry("ip6_mr_cache", net->proc_net);
|
|
remove_proc_entry("ip6_mr_vif", net->proc_net);
|
|
#endif
|
|
ip6mr_rules_exit(net);
|
|
}
|
|
|
|
static struct pernet_operations ip6mr_net_ops = {
|
|
.init = ip6mr_net_init,
|
|
.exit = ip6mr_net_exit,
|
|
};
|
|
|
|
int __init ip6_mr_init(void)
|
|
{
|
|
int err;
|
|
|
|
mrt_cachep = kmem_cache_create("ip6_mrt_cache",
|
|
sizeof(struct mfc6_cache),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
if (!mrt_cachep)
|
|
return -ENOMEM;
|
|
|
|
err = register_pernet_subsys(&ip6mr_net_ops);
|
|
if (err)
|
|
goto reg_pernet_fail;
|
|
|
|
err = register_netdevice_notifier(&ip6_mr_notifier);
|
|
if (err)
|
|
goto reg_notif_fail;
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
|
|
pr_err("%s: can't add PIM protocol\n", __func__);
|
|
err = -EAGAIN;
|
|
goto add_proto_fail;
|
|
}
|
|
#endif
|
|
rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
|
|
ip6mr_rtm_dumproute, NULL);
|
|
return 0;
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
add_proto_fail:
|
|
unregister_netdevice_notifier(&ip6_mr_notifier);
|
|
#endif
|
|
reg_notif_fail:
|
|
unregister_pernet_subsys(&ip6mr_net_ops);
|
|
reg_pernet_fail:
|
|
kmem_cache_destroy(mrt_cachep);
|
|
return err;
|
|
}
|
|
|
|
void ip6_mr_cleanup(void)
|
|
{
|
|
unregister_netdevice_notifier(&ip6_mr_notifier);
|
|
unregister_pernet_subsys(&ip6mr_net_ops);
|
|
kmem_cache_destroy(mrt_cachep);
|
|
}
|
|
|
|
static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
|
|
struct mf6cctl *mfc, int mrtsock, int parent)
|
|
{
|
|
bool found = false;
|
|
int line;
|
|
struct mfc6_cache *uc, *c;
|
|
unsigned char ttls[MAXMIFS];
|
|
int i;
|
|
|
|
if (mfc->mf6cc_parent >= MAXMIFS)
|
|
return -ENFILE;
|
|
|
|
memset(ttls, 255, MAXMIFS);
|
|
for (i = 0; i < MAXMIFS; i++) {
|
|
if (IF_ISSET(i, &mfc->mf6cc_ifset))
|
|
ttls[i] = 1;
|
|
|
|
}
|
|
|
|
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
|
|
|
|
list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
|
|
if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
|
|
ipv6_addr_equal(&c->mf6c_mcastgrp,
|
|
&mfc->mf6cc_mcastgrp.sin6_addr) &&
|
|
(parent == -1 || parent == mfc->mf6cc_parent)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found) {
|
|
write_lock_bh(&mrt_lock);
|
|
c->mf6c_parent = mfc->mf6cc_parent;
|
|
ip6mr_update_thresholds(mrt, c, ttls);
|
|
if (!mrtsock)
|
|
c->mfc_flags |= MFC_STATIC;
|
|
write_unlock_bh(&mrt_lock);
|
|
mr6_netlink_event(mrt, c, RTM_NEWROUTE);
|
|
return 0;
|
|
}
|
|
|
|
if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
|
|
!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
|
|
return -EINVAL;
|
|
|
|
c = ip6mr_cache_alloc();
|
|
if (c == NULL)
|
|
return -ENOMEM;
|
|
|
|
c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
|
|
c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
|
|
c->mf6c_parent = mfc->mf6cc_parent;
|
|
ip6mr_update_thresholds(mrt, c, ttls);
|
|
if (!mrtsock)
|
|
c->mfc_flags |= MFC_STATIC;
|
|
|
|
write_lock_bh(&mrt_lock);
|
|
list_add(&c->list, &mrt->mfc6_cache_array[line]);
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
/*
|
|
* Check to see if we resolved a queued list. If so we
|
|
* need to send on the frames and tidy up.
|
|
*/
|
|
found = false;
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
|
|
if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
|
|
ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
|
|
list_del(&uc->list);
|
|
atomic_dec(&mrt->cache_resolve_queue_len);
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (list_empty(&mrt->mfc6_unres_queue))
|
|
del_timer(&mrt->ipmr_expire_timer);
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
if (found) {
|
|
ip6mr_cache_resolve(net, mrt, uc, c);
|
|
ip6mr_cache_free(uc);
|
|
}
|
|
mr6_netlink_event(mrt, c, RTM_NEWROUTE);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Close the multicast socket, and clear the vif tables etc
|
|
*/
|
|
|
|
static void mroute_clean_tables(struct mr6_table *mrt)
|
|
{
|
|
int i;
|
|
LIST_HEAD(list);
|
|
struct mfc6_cache *c, *next;
|
|
|
|
/*
|
|
* Shut down all active vif entries
|
|
*/
|
|
for (i = 0; i < mrt->maxvif; i++) {
|
|
if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
|
|
mif6_delete(mrt, i, &list);
|
|
}
|
|
unregister_netdevice_many(&list);
|
|
|
|
/*
|
|
* Wipe the cache
|
|
*/
|
|
for (i = 0; i < MFC6_LINES; i++) {
|
|
list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
|
|
if (c->mfc_flags & MFC_STATIC)
|
|
continue;
|
|
write_lock_bh(&mrt_lock);
|
|
list_del(&c->list);
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
mr6_netlink_event(mrt, c, RTM_DELROUTE);
|
|
ip6mr_cache_free(c);
|
|
}
|
|
}
|
|
|
|
if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
|
|
list_del(&c->list);
|
|
mr6_netlink_event(mrt, c, RTM_DELROUTE);
|
|
ip6mr_destroy_unres(mrt, c);
|
|
}
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
}
|
|
}
|
|
|
|
static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
|
|
{
|
|
int err = 0;
|
|
struct net *net = sock_net(sk);
|
|
|
|
rtnl_lock();
|
|
write_lock_bh(&mrt_lock);
|
|
if (likely(mrt->mroute6_sk == NULL)) {
|
|
mrt->mroute6_sk = sk;
|
|
net->ipv6.devconf_all->mc_forwarding++;
|
|
inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
|
|
NETCONFA_IFINDEX_ALL,
|
|
net->ipv6.devconf_all);
|
|
}
|
|
else
|
|
err = -EADDRINUSE;
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
int ip6mr_sk_done(struct sock *sk)
|
|
{
|
|
int err = -EACCES;
|
|
struct net *net = sock_net(sk);
|
|
struct mr6_table *mrt;
|
|
|
|
rtnl_lock();
|
|
ip6mr_for_each_table(mrt, net) {
|
|
if (sk == mrt->mroute6_sk) {
|
|
write_lock_bh(&mrt_lock);
|
|
mrt->mroute6_sk = NULL;
|
|
net->ipv6.devconf_all->mc_forwarding--;
|
|
inet6_netconf_notify_devconf(net,
|
|
NETCONFA_MC_FORWARDING,
|
|
NETCONFA_IFINDEX_ALL,
|
|
net->ipv6.devconf_all);
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
mroute_clean_tables(mrt);
|
|
err = 0;
|
|
break;
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
|
|
{
|
|
struct mr6_table *mrt;
|
|
struct flowi6 fl6 = {
|
|
.flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
|
|
.flowi6_oif = skb->dev->ifindex,
|
|
.flowi6_mark = skb->mark,
|
|
};
|
|
|
|
if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
|
|
return NULL;
|
|
|
|
return mrt->mroute6_sk;
|
|
}
|
|
|
|
/*
|
|
* Socket options and virtual interface manipulation. The whole
|
|
* virtual interface system is a complete heap, but unfortunately
|
|
* that's how BSD mrouted happens to think. Maybe one day with a proper
|
|
* MOSPF/PIM router set up we can clean this up.
|
|
*/
|
|
|
|
int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
int ret, parent = 0;
|
|
struct mif6ctl vif;
|
|
struct mf6cctl mfc;
|
|
mifi_t mifi;
|
|
struct net *net = sock_net(sk);
|
|
struct mr6_table *mrt;
|
|
|
|
mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
if (optname != MRT6_INIT) {
|
|
if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
return -EACCES;
|
|
}
|
|
|
|
switch (optname) {
|
|
case MRT6_INIT:
|
|
if (sk->sk_type != SOCK_RAW ||
|
|
inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
|
|
return -EOPNOTSUPP;
|
|
if (optlen < sizeof(int))
|
|
return -EINVAL;
|
|
|
|
return ip6mr_sk_init(mrt, sk);
|
|
|
|
case MRT6_DONE:
|
|
return ip6mr_sk_done(sk);
|
|
|
|
case MRT6_ADD_MIF:
|
|
if (optlen < sizeof(vif))
|
|
return -EINVAL;
|
|
if (copy_from_user(&vif, optval, sizeof(vif)))
|
|
return -EFAULT;
|
|
if (vif.mif6c_mifi >= MAXMIFS)
|
|
return -ENFILE;
|
|
rtnl_lock();
|
|
ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
case MRT6_DEL_MIF:
|
|
if (optlen < sizeof(mifi_t))
|
|
return -EINVAL;
|
|
if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
|
|
return -EFAULT;
|
|
rtnl_lock();
|
|
ret = mif6_delete(mrt, mifi, NULL);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
/*
|
|
* Manipulate the forwarding caches. These live
|
|
* in a sort of kernel/user symbiosis.
|
|
*/
|
|
case MRT6_ADD_MFC:
|
|
case MRT6_DEL_MFC:
|
|
parent = -1;
|
|
case MRT6_ADD_MFC_PROXY:
|
|
case MRT6_DEL_MFC_PROXY:
|
|
if (optlen < sizeof(mfc))
|
|
return -EINVAL;
|
|
if (copy_from_user(&mfc, optval, sizeof(mfc)))
|
|
return -EFAULT;
|
|
if (parent == 0)
|
|
parent = mfc.mf6cc_parent;
|
|
rtnl_lock();
|
|
if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
|
|
ret = ip6mr_mfc_delete(mrt, &mfc, parent);
|
|
else
|
|
ret = ip6mr_mfc_add(net, mrt, &mfc,
|
|
sk == mrt->mroute6_sk, parent);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
/*
|
|
* Control PIM assert (to activate pim will activate assert)
|
|
*/
|
|
case MRT6_ASSERT:
|
|
{
|
|
int v;
|
|
|
|
if (optlen != sizeof(v))
|
|
return -EINVAL;
|
|
if (get_user(v, (int __user *)optval))
|
|
return -EFAULT;
|
|
mrt->mroute_do_assert = v;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
case MRT6_PIM:
|
|
{
|
|
int v;
|
|
|
|
if (optlen != sizeof(v))
|
|
return -EINVAL;
|
|
if (get_user(v, (int __user *)optval))
|
|
return -EFAULT;
|
|
v = !!v;
|
|
rtnl_lock();
|
|
ret = 0;
|
|
if (v != mrt->mroute_do_pim) {
|
|
mrt->mroute_do_pim = v;
|
|
mrt->mroute_do_assert = v;
|
|
}
|
|
rtnl_unlock();
|
|
return ret;
|
|
}
|
|
|
|
#endif
|
|
#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
|
|
case MRT6_TABLE:
|
|
{
|
|
u32 v;
|
|
|
|
if (optlen != sizeof(u32))
|
|
return -EINVAL;
|
|
if (get_user(v, (u32 __user *)optval))
|
|
return -EFAULT;
|
|
/* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
|
|
if (v != RT_TABLE_DEFAULT && v >= 100000000)
|
|
return -EINVAL;
|
|
if (sk == mrt->mroute6_sk)
|
|
return -EBUSY;
|
|
|
|
rtnl_lock();
|
|
ret = 0;
|
|
if (!ip6mr_new_table(net, v))
|
|
ret = -ENOMEM;
|
|
raw6_sk(sk)->ip6mr_table = v;
|
|
rtnl_unlock();
|
|
return ret;
|
|
}
|
|
#endif
|
|
/*
|
|
* Spurious command, or MRT6_VERSION which you cannot
|
|
* set.
|
|
*/
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Getsock opt support for the multicast routing system.
|
|
*/
|
|
|
|
int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
|
|
int __user *optlen)
|
|
{
|
|
int olr;
|
|
int val;
|
|
struct net *net = sock_net(sk);
|
|
struct mr6_table *mrt;
|
|
|
|
mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
switch (optname) {
|
|
case MRT6_VERSION:
|
|
val = 0x0305;
|
|
break;
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
case MRT6_PIM:
|
|
val = mrt->mroute_do_pim;
|
|
break;
|
|
#endif
|
|
case MRT6_ASSERT:
|
|
val = mrt->mroute_do_assert;
|
|
break;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (get_user(olr, optlen))
|
|
return -EFAULT;
|
|
|
|
olr = min_t(int, olr, sizeof(int));
|
|
if (olr < 0)
|
|
return -EINVAL;
|
|
|
|
if (put_user(olr, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &val, olr))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The IP multicast ioctl support routines.
|
|
*/
|
|
|
|
int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
|
|
{
|
|
struct sioc_sg_req6 sr;
|
|
struct sioc_mif_req6 vr;
|
|
struct mif_device *vif;
|
|
struct mfc6_cache *c;
|
|
struct net *net = sock_net(sk);
|
|
struct mr6_table *mrt;
|
|
|
|
mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
switch (cmd) {
|
|
case SIOCGETMIFCNT_IN6:
|
|
if (copy_from_user(&vr, arg, sizeof(vr)))
|
|
return -EFAULT;
|
|
if (vr.mifi >= mrt->maxvif)
|
|
return -EINVAL;
|
|
read_lock(&mrt_lock);
|
|
vif = &mrt->vif6_table[vr.mifi];
|
|
if (MIF_EXISTS(mrt, vr.mifi)) {
|
|
vr.icount = vif->pkt_in;
|
|
vr.ocount = vif->pkt_out;
|
|
vr.ibytes = vif->bytes_in;
|
|
vr.obytes = vif->bytes_out;
|
|
read_unlock(&mrt_lock);
|
|
|
|
if (copy_to_user(arg, &vr, sizeof(vr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
return -EADDRNOTAVAIL;
|
|
case SIOCGETSGCNT_IN6:
|
|
if (copy_from_user(&sr, arg, sizeof(sr)))
|
|
return -EFAULT;
|
|
|
|
read_lock(&mrt_lock);
|
|
c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
|
|
if (c) {
|
|
sr.pktcnt = c->mfc_un.res.pkt;
|
|
sr.bytecnt = c->mfc_un.res.bytes;
|
|
sr.wrong_if = c->mfc_un.res.wrong_if;
|
|
read_unlock(&mrt_lock);
|
|
|
|
if (copy_to_user(arg, &sr, sizeof(sr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
return -EADDRNOTAVAIL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_sioc_sg_req6 {
|
|
struct sockaddr_in6 src;
|
|
struct sockaddr_in6 grp;
|
|
compat_ulong_t pktcnt;
|
|
compat_ulong_t bytecnt;
|
|
compat_ulong_t wrong_if;
|
|
};
|
|
|
|
struct compat_sioc_mif_req6 {
|
|
mifi_t mifi;
|
|
compat_ulong_t icount;
|
|
compat_ulong_t ocount;
|
|
compat_ulong_t ibytes;
|
|
compat_ulong_t obytes;
|
|
};
|
|
|
|
int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct compat_sioc_sg_req6 sr;
|
|
struct compat_sioc_mif_req6 vr;
|
|
struct mif_device *vif;
|
|
struct mfc6_cache *c;
|
|
struct net *net = sock_net(sk);
|
|
struct mr6_table *mrt;
|
|
|
|
mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
switch (cmd) {
|
|
case SIOCGETMIFCNT_IN6:
|
|
if (copy_from_user(&vr, arg, sizeof(vr)))
|
|
return -EFAULT;
|
|
if (vr.mifi >= mrt->maxvif)
|
|
return -EINVAL;
|
|
read_lock(&mrt_lock);
|
|
vif = &mrt->vif6_table[vr.mifi];
|
|
if (MIF_EXISTS(mrt, vr.mifi)) {
|
|
vr.icount = vif->pkt_in;
|
|
vr.ocount = vif->pkt_out;
|
|
vr.ibytes = vif->bytes_in;
|
|
vr.obytes = vif->bytes_out;
|
|
read_unlock(&mrt_lock);
|
|
|
|
if (copy_to_user(arg, &vr, sizeof(vr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
return -EADDRNOTAVAIL;
|
|
case SIOCGETSGCNT_IN6:
|
|
if (copy_from_user(&sr, arg, sizeof(sr)))
|
|
return -EFAULT;
|
|
|
|
read_lock(&mrt_lock);
|
|
c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
|
|
if (c) {
|
|
sr.pktcnt = c->mfc_un.res.pkt;
|
|
sr.bytecnt = c->mfc_un.res.bytes;
|
|
sr.wrong_if = c->mfc_un.res.wrong_if;
|
|
read_unlock(&mrt_lock);
|
|
|
|
if (copy_to_user(arg, &sr, sizeof(sr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
return -EADDRNOTAVAIL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static inline int ip6mr_forward2_finish(struct sk_buff *skb)
|
|
{
|
|
IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_OUTFORWDATAGRAMS);
|
|
IP6_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
|
|
IPSTATS_MIB_OUTOCTETS, skb->len);
|
|
return dst_output(skb);
|
|
}
|
|
|
|
/*
|
|
* Processing handlers for ip6mr_forward
|
|
*/
|
|
|
|
static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
|
|
struct sk_buff *skb, struct mfc6_cache *c, int vifi)
|
|
{
|
|
struct ipv6hdr *ipv6h;
|
|
struct mif_device *vif = &mrt->vif6_table[vifi];
|
|
struct net_device *dev;
|
|
struct dst_entry *dst;
|
|
struct flowi6 fl6;
|
|
|
|
if (vif->dev == NULL)
|
|
goto out_free;
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (vif->flags & MIFF_REGISTER) {
|
|
vif->pkt_out++;
|
|
vif->bytes_out += skb->len;
|
|
vif->dev->stats.tx_bytes += skb->len;
|
|
vif->dev->stats.tx_packets++;
|
|
ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
|
|
goto out_free;
|
|
}
|
|
#endif
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
|
|
fl6 = (struct flowi6) {
|
|
.flowi6_oif = vif->link,
|
|
.daddr = ipv6h->daddr,
|
|
};
|
|
|
|
dst = ip6_route_output(net, NULL, &fl6);
|
|
if (dst->error) {
|
|
dst_release(dst);
|
|
goto out_free;
|
|
}
|
|
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, dst);
|
|
|
|
/*
|
|
* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
|
|
* not only before forwarding, but after forwarding on all output
|
|
* interfaces. It is clear, if mrouter runs a multicasting
|
|
* program, it should receive packets not depending to what interface
|
|
* program is joined.
|
|
* If we will not make it, the program will have to join on all
|
|
* interfaces. On the other hand, multihoming host (or router, but
|
|
* not mrouter) cannot join to more than one interface - it will
|
|
* result in receiving multiple packets.
|
|
*/
|
|
dev = vif->dev;
|
|
skb->dev = dev;
|
|
vif->pkt_out++;
|
|
vif->bytes_out += skb->len;
|
|
|
|
/* We are about to write */
|
|
/* XXX: extension headers? */
|
|
if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
|
|
goto out_free;
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
ipv6h->hop_limit--;
|
|
|
|
IP6CB(skb)->flags |= IP6SKB_FORWARDED;
|
|
|
|
return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev,
|
|
ip6mr_forward2_finish);
|
|
|
|
out_free:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
|
|
{
|
|
int ct;
|
|
|
|
for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
|
|
if (mrt->vif6_table[ct].dev == dev)
|
|
break;
|
|
}
|
|
return ct;
|
|
}
|
|
|
|
static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
|
|
struct sk_buff *skb, struct mfc6_cache *cache)
|
|
{
|
|
int psend = -1;
|
|
int vif, ct;
|
|
int true_vifi = ip6mr_find_vif(mrt, skb->dev);
|
|
|
|
vif = cache->mf6c_parent;
|
|
cache->mfc_un.res.pkt++;
|
|
cache->mfc_un.res.bytes += skb->len;
|
|
|
|
if (ipv6_addr_any(&cache->mf6c_origin) && true_vifi >= 0) {
|
|
struct mfc6_cache *cache_proxy;
|
|
|
|
/* For an (*,G) entry, we only check that the incomming
|
|
* interface is part of the static tree.
|
|
*/
|
|
cache_proxy = ip6mr_cache_find_any_parent(mrt, vif);
|
|
if (cache_proxy &&
|
|
cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
|
|
goto forward;
|
|
}
|
|
|
|
/*
|
|
* Wrong interface: drop packet and (maybe) send PIM assert.
|
|
*/
|
|
if (mrt->vif6_table[vif].dev != skb->dev) {
|
|
cache->mfc_un.res.wrong_if++;
|
|
|
|
if (true_vifi >= 0 && mrt->mroute_do_assert &&
|
|
/* pimsm uses asserts, when switching from RPT to SPT,
|
|
so that we cannot check that packet arrived on an oif.
|
|
It is bad, but otherwise we would need to move pretty
|
|
large chunk of pimd to kernel. Ough... --ANK
|
|
*/
|
|
(mrt->mroute_do_pim ||
|
|
cache->mfc_un.res.ttls[true_vifi] < 255) &&
|
|
time_after(jiffies,
|
|
cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
|
|
cache->mfc_un.res.last_assert = jiffies;
|
|
ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
|
|
}
|
|
goto dont_forward;
|
|
}
|
|
|
|
forward:
|
|
mrt->vif6_table[vif].pkt_in++;
|
|
mrt->vif6_table[vif].bytes_in += skb->len;
|
|
|
|
/*
|
|
* Forward the frame
|
|
*/
|
|
if (ipv6_addr_any(&cache->mf6c_origin) &&
|
|
ipv6_addr_any(&cache->mf6c_mcastgrp)) {
|
|
if (true_vifi >= 0 &&
|
|
true_vifi != cache->mf6c_parent &&
|
|
ipv6_hdr(skb)->hop_limit >
|
|
cache->mfc_un.res.ttls[cache->mf6c_parent]) {
|
|
/* It's an (*,*) entry and the packet is not coming from
|
|
* the upstream: forward the packet to the upstream
|
|
* only.
|
|
*/
|
|
psend = cache->mf6c_parent;
|
|
goto last_forward;
|
|
}
|
|
goto dont_forward;
|
|
}
|
|
for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
|
|
/* For (*,G) entry, don't forward to the incoming interface */
|
|
if ((!ipv6_addr_any(&cache->mf6c_origin) || ct != true_vifi) &&
|
|
ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
|
|
if (psend != -1) {
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (skb2)
|
|
ip6mr_forward2(net, mrt, skb2, cache, psend);
|
|
}
|
|
psend = ct;
|
|
}
|
|
}
|
|
last_forward:
|
|
if (psend != -1) {
|
|
ip6mr_forward2(net, mrt, skb, cache, psend);
|
|
return;
|
|
}
|
|
|
|
dont_forward:
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
|
|
/*
|
|
* Multicast packets for forwarding arrive here
|
|
*/
|
|
|
|
int ip6_mr_input(struct sk_buff *skb)
|
|
{
|
|
struct mfc6_cache *cache;
|
|
struct net *net = dev_net(skb->dev);
|
|
struct mr6_table *mrt;
|
|
struct flowi6 fl6 = {
|
|
.flowi6_iif = skb->dev->ifindex,
|
|
.flowi6_mark = skb->mark,
|
|
};
|
|
int err;
|
|
|
|
err = ip6mr_fib_lookup(net, &fl6, &mrt);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
read_lock(&mrt_lock);
|
|
cache = ip6mr_cache_find(mrt,
|
|
&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
|
|
if (cache == NULL) {
|
|
int vif = ip6mr_find_vif(mrt, skb->dev);
|
|
|
|
if (vif >= 0)
|
|
cache = ip6mr_cache_find_any(mrt,
|
|
&ipv6_hdr(skb)->daddr,
|
|
vif);
|
|
}
|
|
|
|
/*
|
|
* No usable cache entry
|
|
*/
|
|
if (cache == NULL) {
|
|
int vif;
|
|
|
|
vif = ip6mr_find_vif(mrt, skb->dev);
|
|
if (vif >= 0) {
|
|
int err = ip6mr_cache_unresolved(mrt, vif, skb);
|
|
read_unlock(&mrt_lock);
|
|
|
|
return err;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
kfree_skb(skb);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ip6_mr_forward(net, mrt, skb, cache);
|
|
|
|
read_unlock(&mrt_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
|
|
struct mfc6_cache *c, struct rtmsg *rtm)
|
|
{
|
|
int ct;
|
|
struct rtnexthop *nhp;
|
|
struct nlattr *mp_attr;
|
|
struct rta_mfc_stats mfcs;
|
|
|
|
/* If cache is unresolved, don't try to parse IIF and OIF */
|
|
if (c->mf6c_parent >= MAXMIFS)
|
|
return -ENOENT;
|
|
|
|
if (MIF_EXISTS(mrt, c->mf6c_parent) &&
|
|
nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)
|
|
return -EMSGSIZE;
|
|
mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
|
|
if (mp_attr == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
|
|
if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
|
|
nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
|
|
if (nhp == NULL) {
|
|
nla_nest_cancel(skb, mp_attr);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
nhp->rtnh_flags = 0;
|
|
nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
|
|
nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
|
|
nhp->rtnh_len = sizeof(*nhp);
|
|
}
|
|
}
|
|
|
|
nla_nest_end(skb, mp_attr);
|
|
|
|
mfcs.mfcs_packets = c->mfc_un.res.pkt;
|
|
mfcs.mfcs_bytes = c->mfc_un.res.bytes;
|
|
mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
|
|
if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
|
|
return -EMSGSIZE;
|
|
|
|
rtm->rtm_type = RTN_MULTICAST;
|
|
return 1;
|
|
}
|
|
|
|
int ip6mr_get_route(struct net *net,
|
|
struct sk_buff *skb, struct rtmsg *rtm, int nowait)
|
|
{
|
|
int err;
|
|
struct mr6_table *mrt;
|
|
struct mfc6_cache *cache;
|
|
struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
|
|
|
|
mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
read_lock(&mrt_lock);
|
|
cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
|
|
if (!cache && skb->dev) {
|
|
int vif = ip6mr_find_vif(mrt, skb->dev);
|
|
|
|
if (vif >= 0)
|
|
cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
|
|
vif);
|
|
}
|
|
|
|
if (!cache) {
|
|
struct sk_buff *skb2;
|
|
struct ipv6hdr *iph;
|
|
struct net_device *dev;
|
|
int vif;
|
|
|
|
if (nowait) {
|
|
read_unlock(&mrt_lock);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
dev = skb->dev;
|
|
if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
|
|
read_unlock(&mrt_lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* really correct? */
|
|
skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
|
|
if (!skb2) {
|
|
read_unlock(&mrt_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
skb_reset_transport_header(skb2);
|
|
|
|
skb_put(skb2, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(skb2);
|
|
|
|
iph = ipv6_hdr(skb2);
|
|
iph->version = 0;
|
|
iph->priority = 0;
|
|
iph->flow_lbl[0] = 0;
|
|
iph->flow_lbl[1] = 0;
|
|
iph->flow_lbl[2] = 0;
|
|
iph->payload_len = 0;
|
|
iph->nexthdr = IPPROTO_NONE;
|
|
iph->hop_limit = 0;
|
|
iph->saddr = rt->rt6i_src.addr;
|
|
iph->daddr = rt->rt6i_dst.addr;
|
|
|
|
err = ip6mr_cache_unresolved(mrt, vif, skb2);
|
|
read_unlock(&mrt_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
|
|
cache->mfc_flags |= MFC_NOTIFY;
|
|
|
|
err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
|
|
read_unlock(&mrt_lock);
|
|
return err;
|
|
}
|
|
|
|
static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
|
|
u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
|
|
int flags)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct rtmsg *rtm;
|
|
int err;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
rtm->rtm_family = RTNL_FAMILY_IP6MR;
|
|
rtm->rtm_dst_len = 128;
|
|
rtm->rtm_src_len = 128;
|
|
rtm->rtm_tos = 0;
|
|
rtm->rtm_table = mrt->id;
|
|
if (nla_put_u32(skb, RTA_TABLE, mrt->id))
|
|
goto nla_put_failure;
|
|
rtm->rtm_type = RTN_MULTICAST;
|
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
if (c->mfc_flags & MFC_STATIC)
|
|
rtm->rtm_protocol = RTPROT_STATIC;
|
|
else
|
|
rtm->rtm_protocol = RTPROT_MROUTED;
|
|
rtm->rtm_flags = 0;
|
|
|
|
if (nla_put(skb, RTA_SRC, 16, &c->mf6c_origin) ||
|
|
nla_put(skb, RTA_DST, 16, &c->mf6c_mcastgrp))
|
|
goto nla_put_failure;
|
|
err = __ip6mr_fill_mroute(mrt, skb, c, rtm);
|
|
/* do not break the dump if cache is unresolved */
|
|
if (err < 0 && err != -ENOENT)
|
|
goto nla_put_failure;
|
|
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int mr6_msgsize(bool unresolved, int maxvif)
|
|
{
|
|
size_t len =
|
|
NLMSG_ALIGN(sizeof(struct rtmsg))
|
|
+ nla_total_size(4) /* RTA_TABLE */
|
|
+ nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
|
|
+ nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
|
|
;
|
|
|
|
if (!unresolved)
|
|
len = len
|
|
+ nla_total_size(4) /* RTA_IIF */
|
|
+ nla_total_size(0) /* RTA_MULTIPATH */
|
|
+ maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
|
|
/* RTA_MFC_STATS */
|
|
+ nla_total_size(sizeof(struct rta_mfc_stats))
|
|
;
|
|
|
|
return len;
|
|
}
|
|
|
|
static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
|
|
int cmd)
|
|
{
|
|
struct net *net = read_pnet(&mrt->net);
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif),
|
|
GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
|
|
return;
|
|
|
|
errout:
|
|
kfree_skb(skb);
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
|
|
}
|
|
|
|
static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct mr6_table *mrt;
|
|
struct mfc6_cache *mfc;
|
|
unsigned int t = 0, s_t;
|
|
unsigned int h = 0, s_h;
|
|
unsigned int e = 0, s_e;
|
|
|
|
s_t = cb->args[0];
|
|
s_h = cb->args[1];
|
|
s_e = cb->args[2];
|
|
|
|
read_lock(&mrt_lock);
|
|
ip6mr_for_each_table(mrt, net) {
|
|
if (t < s_t)
|
|
goto next_table;
|
|
if (t > s_t)
|
|
s_h = 0;
|
|
for (h = s_h; h < MFC6_LINES; h++) {
|
|
list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
|
|
if (e < s_e)
|
|
goto next_entry;
|
|
if (ip6mr_fill_mroute(mrt, skb,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
mfc, RTM_NEWROUTE,
|
|
NLM_F_MULTI) < 0)
|
|
goto done;
|
|
next_entry:
|
|
e++;
|
|
}
|
|
e = s_e = 0;
|
|
}
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) {
|
|
if (e < s_e)
|
|
goto next_entry2;
|
|
if (ip6mr_fill_mroute(mrt, skb,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
mfc, RTM_NEWROUTE,
|
|
NLM_F_MULTI) < 0) {
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
goto done;
|
|
}
|
|
next_entry2:
|
|
e++;
|
|
}
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
e = s_e = 0;
|
|
s_h = 0;
|
|
next_table:
|
|
t++;
|
|
}
|
|
done:
|
|
read_unlock(&mrt_lock);
|
|
|
|
cb->args[2] = e;
|
|
cb->args[1] = h;
|
|
cb->args[0] = t;
|
|
|
|
return skb->len;
|
|
}
|