mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
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cf778b00e9
commit a9b3cd7f32
(rcu: convert uses of rcu_assign_pointer(x, NULL) to
RCU_INIT_POINTER) did a lot of incorrect changes, since it did a
complete conversion of rcu_assign_pointer(x, y) to RCU_INIT_POINTER(x,
y).
We miss needed barriers, even on x86, when y is not NULL.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Stephen Hemminger <shemminger@vyatta.com>
CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2560 lines
57 KiB
C
2560 lines
57 KiB
C
/*
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* IP multicast routing support for mrouted 3.6/3.8
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*
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* (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk>
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* Linux Consultancy and Custom Driver Development
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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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* Fixes:
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* Michael Chastain : Incorrect size of copying.
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* Alan Cox : Added the cache manager code
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* Alan Cox : Fixed the clone/copy bug and device race.
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* Mike McLagan : Routing by source
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* Malcolm Beattie : Buffer handling fixes.
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* Alexey Kuznetsov : Double buffer free and other fixes.
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* SVR Anand : Fixed several multicast bugs and problems.
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* Alexey Kuznetsov : Status, optimisations and more.
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* Brad Parker : Better behaviour on mrouted upcall
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* overflow.
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* Carlos Picoto : PIMv1 Support
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* Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header
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* Relax this requirement to work with older peers.
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*
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*/
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <linux/types.h>
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#include <linux/capability.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/in.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/igmp.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/mroute.h>
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#include <linux/init.h>
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#include <linux/if_ether.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <net/route.h>
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#include <net/sock.h>
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#include <net/icmp.h>
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#include <net/udp.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 <linux/netfilter_ipv4.h>
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#include <linux/compat.h>
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#include <linux/export.h>
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#include <net/ipip.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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#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
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#define CONFIG_IP_PIMSM 1
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#endif
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struct mr_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 __rcu *mroute_sk;
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struct timer_list ipmr_expire_timer;
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struct list_head mfc_unres_queue;
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struct list_head mfc_cache_array[MFC_LINES];
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struct vif_device vif_table[MAXVIFS];
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int maxvif;
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atomic_t cache_resolve_queue_len;
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int mroute_do_assert;
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int mroute_do_pim;
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#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_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 ipmr_rule {
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struct fib_rule common;
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};
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struct ipmr_result {
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struct mr_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 VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_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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*
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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 mr_table *ipmr_new_table(struct net *net, u32 id);
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static int ip_mr_forward(struct net *net, struct mr_table *mrt,
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struct sk_buff *skb, struct mfc_cache *cache,
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int local);
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static int ipmr_cache_report(struct mr_table *mrt,
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struct sk_buff *pkt, vifi_t vifi, int assert);
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static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
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struct mfc_cache *c, struct rtmsg *rtm);
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static void ipmr_expire_process(unsigned long arg);
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#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
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#define ipmr_for_each_table(mrt, net) \
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list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
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static struct mr_table *ipmr_get_table(struct net *net, u32 id)
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{
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struct mr_table *mrt;
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ipmr_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 ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
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struct mr_table **mrt)
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{
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struct ipmr_result res;
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struct fib_lookup_arg arg = { .result = &res, };
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int err;
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err = fib_rules_lookup(net->ipv4.mr_rules_ops,
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flowi4_to_flowi(flp4), 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 ipmr_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 ipmr_result *res = arg->result;
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struct mr_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 = ipmr_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 ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, 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 ipmr_rule_policy[FRA_MAX + 1] = {
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FRA_GENERIC_POLICY,
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};
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static int ipmr_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 ipmr_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 ipmr_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_initdata ipmr_rules_ops_template = {
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.family = RTNL_FAMILY_IPMR,
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.rule_size = sizeof(struct ipmr_rule),
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.addr_size = sizeof(u32),
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.action = ipmr_rule_action,
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.match = ipmr_rule_match,
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.configure = ipmr_rule_configure,
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.compare = ipmr_rule_compare,
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.default_pref = fib_default_rule_pref,
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.fill = ipmr_rule_fill,
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.nlgroup = RTNLGRP_IPV4_RULE,
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.policy = ipmr_rule_policy,
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.owner = THIS_MODULE,
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};
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static int __net_init ipmr_rules_init(struct net *net)
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{
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struct fib_rules_ops *ops;
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struct mr_table *mrt;
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int err;
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ops = fib_rules_register(&ipmr_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->ipv4.mr_tables);
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mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
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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, RT_TABLE_DEFAULT, 0);
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if (err < 0)
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goto err2;
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net->ipv4.mr_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 ipmr_rules_exit(struct net *net)
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{
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struct mr_table *mrt, *next;
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list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
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list_del(&mrt->list);
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kfree(mrt);
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}
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fib_rules_unregister(net->ipv4.mr_rules_ops);
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}
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#else
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#define ipmr_for_each_table(mrt, net) \
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for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
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static struct mr_table *ipmr_get_table(struct net *net, u32 id)
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{
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return net->ipv4.mrt;
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}
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static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
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struct mr_table **mrt)
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{
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*mrt = net->ipv4.mrt;
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return 0;
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}
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static int __net_init ipmr_rules_init(struct net *net)
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{
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net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
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return net->ipv4.mrt ? 0 : -ENOMEM;
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}
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static void __net_exit ipmr_rules_exit(struct net *net)
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{
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kfree(net->ipv4.mrt);
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}
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#endif
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static struct mr_table *ipmr_new_table(struct net *net, u32 id)
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{
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struct mr_table *mrt;
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unsigned int i;
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mrt = ipmr_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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write_pnet(&mrt->net, net);
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mrt->id = id;
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/* Forwarding cache */
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for (i = 0; i < MFC_LINES; i++)
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INIT_LIST_HEAD(&mrt->mfc_cache_array[i]);
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INIT_LIST_HEAD(&mrt->mfc_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_IP_PIMSM
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mrt->mroute_reg_vif_num = -1;
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#endif
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#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
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list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
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#endif
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return mrt;
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}
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/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
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static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
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{
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struct net *net = dev_net(dev);
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dev_close(dev);
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dev = __dev_get_by_name(net, "tunl0");
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if (dev) {
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const struct net_device_ops *ops = dev->netdev_ops;
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struct ifreq ifr;
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struct ip_tunnel_parm p;
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memset(&p, 0, sizeof(p));
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p.iph.daddr = v->vifc_rmt_addr.s_addr;
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p.iph.saddr = v->vifc_lcl_addr.s_addr;
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p.iph.version = 4;
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p.iph.ihl = 5;
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p.iph.protocol = IPPROTO_IPIP;
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sprintf(p.name, "dvmrp%d", v->vifc_vifi);
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ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
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if (ops->ndo_do_ioctl) {
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mm_segment_t oldfs = get_fs();
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set_fs(KERNEL_DS);
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ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
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set_fs(oldfs);
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}
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}
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}
|
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|
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static
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struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
|
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{
|
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struct net_device *dev;
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|
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dev = __dev_get_by_name(net, "tunl0");
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|
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if (dev) {
|
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const struct net_device_ops *ops = dev->netdev_ops;
|
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int err;
|
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struct ifreq ifr;
|
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struct ip_tunnel_parm p;
|
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struct in_device *in_dev;
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|
|
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memset(&p, 0, sizeof(p));
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p.iph.daddr = v->vifc_rmt_addr.s_addr;
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p.iph.saddr = v->vifc_lcl_addr.s_addr;
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p.iph.version = 4;
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p.iph.ihl = 5;
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p.iph.protocol = IPPROTO_IPIP;
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sprintf(p.name, "dvmrp%d", v->vifc_vifi);
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ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
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|
|
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if (ops->ndo_do_ioctl) {
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mm_segment_t oldfs = get_fs();
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|
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set_fs(KERNEL_DS);
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err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
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set_fs(oldfs);
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} else {
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err = -EOPNOTSUPP;
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}
|
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dev = NULL;
|
|
|
|
if (err == 0 &&
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(dev = __dev_get_by_name(net, p.name)) != NULL) {
|
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dev->flags |= IFF_MULTICAST;
|
|
|
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in_dev = __in_dev_get_rtnl(dev);
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if (in_dev == NULL)
|
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goto failure;
|
|
|
|
ipv4_devconf_setall(in_dev);
|
|
IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
|
|
|
|
if (dev_open(dev))
|
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goto failure;
|
|
dev_hold(dev);
|
|
}
|
|
}
|
|
return dev;
|
|
|
|
failure:
|
|
/* allow the register to be completed before unregistering. */
|
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rtnl_unlock();
|
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rtnl_lock();
|
|
|
|
unregister_netdevice(dev);
|
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return NULL;
|
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}
|
|
|
|
#ifdef CONFIG_IP_PIMSM
|
|
|
|
static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct mr_table *mrt;
|
|
struct flowi4 fl4 = {
|
|
.flowi4_oif = dev->ifindex,
|
|
.flowi4_iif = skb->skb_iif,
|
|
.flowi4_mark = skb->mark,
|
|
};
|
|
int err;
|
|
|
|
err = ipmr_fib_lookup(net, &fl4, &mrt);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
read_lock(&mrt_lock);
|
|
dev->stats.tx_bytes += skb->len;
|
|
dev->stats.tx_packets++;
|
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ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
|
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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 = ETH_DATA_LEN - sizeof(struct iphdr) - 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 *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
|
|
{
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
char name[IFNAMSIZ];
|
|
|
|
if (mrt->id == RT_TABLE_DEFAULT)
|
|
sprintf(name, "pimreg");
|
|
else
|
|
sprintf(name, "pimreg%u", mrt->id);
|
|
|
|
dev = alloc_netdev(0, name, 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;
|
|
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev) {
|
|
rcu_read_unlock();
|
|
goto failure;
|
|
}
|
|
|
|
ipv4_devconf_setall(in_dev);
|
|
IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
|
|
rcu_read_unlock();
|
|
|
|
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
|
|
* @notify: Set to 1, if the caller is a notifier_call
|
|
*/
|
|
|
|
static int vif_delete(struct mr_table *mrt, int vifi, int notify,
|
|
struct list_head *head)
|
|
{
|
|
struct vif_device *v;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
|
|
if (vifi < 0 || vifi >= mrt->maxvif)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
v = &mrt->vif_table[vifi];
|
|
|
|
write_lock_bh(&mrt_lock);
|
|
dev = v->dev;
|
|
v->dev = NULL;
|
|
|
|
if (!dev) {
|
|
write_unlock_bh(&mrt_lock);
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_PIMSM
|
|
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 (VIF_EXISTS(mrt, tmp))
|
|
break;
|
|
}
|
|
mrt->maxvif = tmp+1;
|
|
}
|
|
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
dev_set_allmulti(dev, -1);
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (in_dev) {
|
|
IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
|
|
ip_rt_multicast_event(in_dev);
|
|
}
|
|
|
|
if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
|
|
unregister_netdevice_queue(dev, head);
|
|
|
|
dev_put(dev);
|
|
return 0;
|
|
}
|
|
|
|
static void ipmr_cache_free_rcu(struct rcu_head *head)
|
|
{
|
|
struct mfc_cache *c = container_of(head, struct mfc_cache, rcu);
|
|
|
|
kmem_cache_free(mrt_cachep, c);
|
|
}
|
|
|
|
static inline void ipmr_cache_free(struct mfc_cache *c)
|
|
{
|
|
call_rcu(&c->rcu, ipmr_cache_free_rcu);
|
|
}
|
|
|
|
/* Destroy an unresolved cache entry, killing queued skbs
|
|
* and reporting error to netlink readers.
|
|
*/
|
|
|
|
static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
|
|
{
|
|
struct net *net = read_pnet(&mrt->net);
|
|
struct sk_buff *skb;
|
|
struct nlmsgerr *e;
|
|
|
|
atomic_dec(&mrt->cache_resolve_queue_len);
|
|
|
|
while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
|
|
if (ip_hdr(skb)->version == 0) {
|
|
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
|
|
nlh->nlmsg_type = NLMSG_ERROR;
|
|
nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
|
|
skb_trim(skb, nlh->nlmsg_len);
|
|
e = NLMSG_DATA(nlh);
|
|
e->error = -ETIMEDOUT;
|
|
memset(&e->msg, 0, sizeof(e->msg));
|
|
|
|
rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
|
|
} else {
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
ipmr_cache_free(c);
|
|
}
|
|
|
|
|
|
/* Timer process for the unresolved queue. */
|
|
|
|
static void ipmr_expire_process(unsigned long arg)
|
|
{
|
|
struct mr_table *mrt = (struct mr_table *)arg;
|
|
unsigned long now;
|
|
unsigned long expires;
|
|
struct mfc_cache *c, *next;
|
|
|
|
if (!spin_trylock(&mfc_unres_lock)) {
|
|
mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
|
|
return;
|
|
}
|
|
|
|
if (list_empty(&mrt->mfc_unres_queue))
|
|
goto out;
|
|
|
|
now = jiffies;
|
|
expires = 10*HZ;
|
|
|
|
list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
|
|
if (time_after(c->mfc_un.unres.expires, now)) {
|
|
unsigned long interval = c->mfc_un.unres.expires - now;
|
|
if (interval < expires)
|
|
expires = interval;
|
|
continue;
|
|
}
|
|
|
|
list_del(&c->list);
|
|
ipmr_destroy_unres(mrt, c);
|
|
}
|
|
|
|
if (!list_empty(&mrt->mfc_unres_queue))
|
|
mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
|
|
|
|
out:
|
|
spin_unlock(&mfc_unres_lock);
|
|
}
|
|
|
|
/* Fill oifs list. It is called under write locked mrt_lock. */
|
|
|
|
static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache,
|
|
unsigned char *ttls)
|
|
{
|
|
int vifi;
|
|
|
|
cache->mfc_un.res.minvif = MAXVIFS;
|
|
cache->mfc_un.res.maxvif = 0;
|
|
memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
|
|
|
|
for (vifi = 0; vifi < mrt->maxvif; vifi++) {
|
|
if (VIF_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 vif_add(struct net *net, struct mr_table *mrt,
|
|
struct vifctl *vifc, int mrtsock)
|
|
{
|
|
int vifi = vifc->vifc_vifi;
|
|
struct vif_device *v = &mrt->vif_table[vifi];
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
int err;
|
|
|
|
/* Is vif busy ? */
|
|
if (VIF_EXISTS(mrt, vifi))
|
|
return -EADDRINUSE;
|
|
|
|
switch (vifc->vifc_flags) {
|
|
#ifdef CONFIG_IP_PIMSM
|
|
case VIFF_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 = ipmr_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 VIFF_TUNNEL:
|
|
dev = ipmr_new_tunnel(net, vifc);
|
|
if (!dev)
|
|
return -ENOBUFS;
|
|
err = dev_set_allmulti(dev, 1);
|
|
if (err) {
|
|
ipmr_del_tunnel(dev, vifc);
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
break;
|
|
|
|
case VIFF_USE_IFINDEX:
|
|
case 0:
|
|
if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
|
|
dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
|
|
if (dev && __in_dev_get_rtnl(dev) == NULL) {
|
|
dev_put(dev);
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
} else {
|
|
dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
|
|
}
|
|
if (!dev)
|
|
return -EADDRNOTAVAIL;
|
|
err = dev_set_allmulti(dev, 1);
|
|
if (err) {
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (!in_dev) {
|
|
dev_put(dev);
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
|
|
ip_rt_multicast_event(in_dev);
|
|
|
|
/* Fill in the VIF structures */
|
|
|
|
v->rate_limit = vifc->vifc_rate_limit;
|
|
v->local = vifc->vifc_lcl_addr.s_addr;
|
|
v->remote = vifc->vifc_rmt_addr.s_addr;
|
|
v->flags = vifc->vifc_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 & (VIFF_TUNNEL | VIFF_REGISTER))
|
|
v->link = dev->iflink;
|
|
|
|
/* And finish update writing critical data */
|
|
write_lock_bh(&mrt_lock);
|
|
v->dev = dev;
|
|
#ifdef CONFIG_IP_PIMSM
|
|
if (v->flags & VIFF_REGISTER)
|
|
mrt->mroute_reg_vif_num = vifi;
|
|
#endif
|
|
if (vifi+1 > mrt->maxvif)
|
|
mrt->maxvif = vifi+1;
|
|
write_unlock_bh(&mrt_lock);
|
|
return 0;
|
|
}
|
|
|
|
/* called with rcu_read_lock() */
|
|
static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
|
|
__be32 origin,
|
|
__be32 mcastgrp)
|
|
{
|
|
int line = MFC_HASH(mcastgrp, origin);
|
|
struct mfc_cache *c;
|
|
|
|
list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) {
|
|
if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp)
|
|
return c;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Allocate a multicast cache entry
|
|
*/
|
|
static struct mfc_cache *ipmr_cache_alloc(void)
|
|
{
|
|
struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
|
|
|
|
if (c)
|
|
c->mfc_un.res.minvif = MAXVIFS;
|
|
return c;
|
|
}
|
|
|
|
static struct mfc_cache *ipmr_cache_alloc_unres(void)
|
|
{
|
|
struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
|
|
|
|
if (c) {
|
|
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 ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
|
|
struct mfc_cache *uc, struct mfc_cache *c)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct nlmsgerr *e;
|
|
|
|
/* Play the pending entries through our router */
|
|
|
|
while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
|
|
if (ip_hdr(skb)->version == 0) {
|
|
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
|
|
|
|
if (__ipmr_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_LENGTH(sizeof(struct nlmsgerr));
|
|
skb_trim(skb, nlh->nlmsg_len);
|
|
e = NLMSG_DATA(nlh);
|
|
e->error = -EMSGSIZE;
|
|
memset(&e->msg, 0, sizeof(e->msg));
|
|
}
|
|
|
|
rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
|
|
} else {
|
|
ip_mr_forward(net, mrt, skb, c, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Bounce a cache query up to mrouted. We could use netlink for this but mrouted
|
|
* expects the following bizarre scheme.
|
|
*
|
|
* Called under mrt_lock.
|
|
*/
|
|
|
|
static int ipmr_cache_report(struct mr_table *mrt,
|
|
struct sk_buff *pkt, vifi_t vifi, int assert)
|
|
{
|
|
struct sk_buff *skb;
|
|
const int ihl = ip_hdrlen(pkt);
|
|
struct igmphdr *igmp;
|
|
struct igmpmsg *msg;
|
|
struct sock *mroute_sk;
|
|
int ret;
|
|
|
|
#ifdef CONFIG_IP_PIMSM
|
|
if (assert == IGMPMSG_WHOLEPKT)
|
|
skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
|
|
else
|
|
#endif
|
|
skb = alloc_skb(128, GFP_ATOMIC);
|
|
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
#ifdef CONFIG_IP_PIMSM
|
|
if (assert == IGMPMSG_WHOLEPKT) {
|
|
/* Ugly, but we have no choice with this interface.
|
|
* Duplicate old header, fix ihl, length etc.
|
|
* And all this only to mangle msg->im_msgtype and
|
|
* to set msg->im_mbz to "mbz" :-)
|
|
*/
|
|
skb_push(skb, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb);
|
|
skb_reset_transport_header(skb);
|
|
msg = (struct igmpmsg *)skb_network_header(skb);
|
|
memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
|
|
msg->im_msgtype = IGMPMSG_WHOLEPKT;
|
|
msg->im_mbz = 0;
|
|
msg->im_vif = mrt->mroute_reg_vif_num;
|
|
ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
|
|
ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
|
|
sizeof(struct iphdr));
|
|
} else
|
|
#endif
|
|
{
|
|
|
|
/* Copy the IP header */
|
|
|
|
skb->network_header = skb->tail;
|
|
skb_put(skb, ihl);
|
|
skb_copy_to_linear_data(skb, pkt->data, ihl);
|
|
ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */
|
|
msg = (struct igmpmsg *)skb_network_header(skb);
|
|
msg->im_vif = vifi;
|
|
skb_dst_set(skb, dst_clone(skb_dst(pkt)));
|
|
|
|
/* Add our header */
|
|
|
|
igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
|
|
igmp->type =
|
|
msg->im_msgtype = assert;
|
|
igmp->code = 0;
|
|
ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
|
|
skb->transport_header = skb->network_header;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
mroute_sk = rcu_dereference(mrt->mroute_sk);
|
|
if (mroute_sk == NULL) {
|
|
rcu_read_unlock();
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Deliver to mrouted */
|
|
|
|
ret = sock_queue_rcv_skb(mroute_sk, skb);
|
|
rcu_read_unlock();
|
|
if (ret < 0) {
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n");
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Queue a packet for resolution. It gets locked cache entry!
|
|
*/
|
|
|
|
static int
|
|
ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
|
|
{
|
|
bool found = false;
|
|
int err;
|
|
struct mfc_cache *c;
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
list_for_each_entry(c, &mrt->mfc_unres_queue, list) {
|
|
if (c->mfc_mcastgrp == iph->daddr &&
|
|
c->mfc_origin == iph->saddr) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
/* Create a new entry if allowable */
|
|
|
|
if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
|
|
(c = ipmr_cache_alloc_unres()) == NULL) {
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
kfree_skb(skb);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
/* Fill in the new cache entry */
|
|
|
|
c->mfc_parent = -1;
|
|
c->mfc_origin = iph->saddr;
|
|
c->mfc_mcastgrp = iph->daddr;
|
|
|
|
/* Reflect first query at mrouted. */
|
|
|
|
err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
|
|
if (err < 0) {
|
|
/* If the report failed throw the cache entry
|
|
out - Brad Parker
|
|
*/
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
ipmr_cache_free(c);
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
atomic_inc(&mrt->cache_resolve_queue_len);
|
|
list_add(&c->list, &mrt->mfc_unres_queue);
|
|
|
|
if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
|
|
mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/*
|
|
* MFC cache manipulation by user space mroute daemon
|
|
*/
|
|
|
|
static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc)
|
|
{
|
|
int line;
|
|
struct mfc_cache *c, *next;
|
|
|
|
line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
|
|
|
|
list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) {
|
|
if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
|
|
c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
|
|
list_del_rcu(&c->list);
|
|
|
|
ipmr_cache_free(c);
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
|
|
struct mfcctl *mfc, int mrtsock)
|
|
{
|
|
bool found = false;
|
|
int line;
|
|
struct mfc_cache *uc, *c;
|
|
|
|
if (mfc->mfcc_parent >= MAXVIFS)
|
|
return -ENFILE;
|
|
|
|
line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
|
|
|
|
list_for_each_entry(c, &mrt->mfc_cache_array[line], list) {
|
|
if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
|
|
c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found) {
|
|
write_lock_bh(&mrt_lock);
|
|
c->mfc_parent = mfc->mfcc_parent;
|
|
ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
|
|
if (!mrtsock)
|
|
c->mfc_flags |= MFC_STATIC;
|
|
write_unlock_bh(&mrt_lock);
|
|
return 0;
|
|
}
|
|
|
|
if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
|
|
return -EINVAL;
|
|
|
|
c = ipmr_cache_alloc();
|
|
if (c == NULL)
|
|
return -ENOMEM;
|
|
|
|
c->mfc_origin = mfc->mfcc_origin.s_addr;
|
|
c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
|
|
c->mfc_parent = mfc->mfcc_parent;
|
|
ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
|
|
if (!mrtsock)
|
|
c->mfc_flags |= MFC_STATIC;
|
|
|
|
list_add_rcu(&c->list, &mrt->mfc_cache_array[line]);
|
|
|
|
/*
|
|
* 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->mfc_unres_queue, list) {
|
|
if (uc->mfc_origin == c->mfc_origin &&
|
|
uc->mfc_mcastgrp == c->mfc_mcastgrp) {
|
|
list_del(&uc->list);
|
|
atomic_dec(&mrt->cache_resolve_queue_len);
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (list_empty(&mrt->mfc_unres_queue))
|
|
del_timer(&mrt->ipmr_expire_timer);
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
if (found) {
|
|
ipmr_cache_resolve(net, mrt, uc, c);
|
|
ipmr_cache_free(uc);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Close the multicast socket, and clear the vif tables etc
|
|
*/
|
|
|
|
static void mroute_clean_tables(struct mr_table *mrt)
|
|
{
|
|
int i;
|
|
LIST_HEAD(list);
|
|
struct mfc_cache *c, *next;
|
|
|
|
/* Shut down all active vif entries */
|
|
|
|
for (i = 0; i < mrt->maxvif; i++) {
|
|
if (!(mrt->vif_table[i].flags & VIFF_STATIC))
|
|
vif_delete(mrt, i, 0, &list);
|
|
}
|
|
unregister_netdevice_many(&list);
|
|
|
|
/* Wipe the cache */
|
|
|
|
for (i = 0; i < MFC_LINES; i++) {
|
|
list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) {
|
|
if (c->mfc_flags & MFC_STATIC)
|
|
continue;
|
|
list_del_rcu(&c->list);
|
|
ipmr_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->mfc_unres_queue, list) {
|
|
list_del(&c->list);
|
|
ipmr_destroy_unres(mrt, c);
|
|
}
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
}
|
|
}
|
|
|
|
/* called from ip_ra_control(), before an RCU grace period,
|
|
* we dont need to call synchronize_rcu() here
|
|
*/
|
|
static void mrtsock_destruct(struct sock *sk)
|
|
{
|
|
struct net *net = sock_net(sk);
|
|
struct mr_table *mrt;
|
|
|
|
rtnl_lock();
|
|
ipmr_for_each_table(mrt, net) {
|
|
if (sk == rtnl_dereference(mrt->mroute_sk)) {
|
|
IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
|
|
RCU_INIT_POINTER(mrt->mroute_sk, NULL);
|
|
mroute_clean_tables(mrt);
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
/*
|
|
* 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 ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
int ret;
|
|
struct vifctl vif;
|
|
struct mfcctl mfc;
|
|
struct net *net = sock_net(sk);
|
|
struct mr_table *mrt;
|
|
|
|
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
if (optname != MRT_INIT) {
|
|
if (sk != rcu_access_pointer(mrt->mroute_sk) &&
|
|
!capable(CAP_NET_ADMIN))
|
|
return -EACCES;
|
|
}
|
|
|
|
switch (optname) {
|
|
case MRT_INIT:
|
|
if (sk->sk_type != SOCK_RAW ||
|
|
inet_sk(sk)->inet_num != IPPROTO_IGMP)
|
|
return -EOPNOTSUPP;
|
|
if (optlen != sizeof(int))
|
|
return -ENOPROTOOPT;
|
|
|
|
rtnl_lock();
|
|
if (rtnl_dereference(mrt->mroute_sk)) {
|
|
rtnl_unlock();
|
|
return -EADDRINUSE;
|
|
}
|
|
|
|
ret = ip_ra_control(sk, 1, mrtsock_destruct);
|
|
if (ret == 0) {
|
|
rcu_assign_pointer(mrt->mroute_sk, sk);
|
|
IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
|
|
}
|
|
rtnl_unlock();
|
|
return ret;
|
|
case MRT_DONE:
|
|
if (sk != rcu_access_pointer(mrt->mroute_sk))
|
|
return -EACCES;
|
|
return ip_ra_control(sk, 0, NULL);
|
|
case MRT_ADD_VIF:
|
|
case MRT_DEL_VIF:
|
|
if (optlen != sizeof(vif))
|
|
return -EINVAL;
|
|
if (copy_from_user(&vif, optval, sizeof(vif)))
|
|
return -EFAULT;
|
|
if (vif.vifc_vifi >= MAXVIFS)
|
|
return -ENFILE;
|
|
rtnl_lock();
|
|
if (optname == MRT_ADD_VIF) {
|
|
ret = vif_add(net, mrt, &vif,
|
|
sk == rtnl_dereference(mrt->mroute_sk));
|
|
} else {
|
|
ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
|
|
}
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
/*
|
|
* Manipulate the forwarding caches. These live
|
|
* in a sort of kernel/user symbiosis.
|
|
*/
|
|
case MRT_ADD_MFC:
|
|
case MRT_DEL_MFC:
|
|
if (optlen != sizeof(mfc))
|
|
return -EINVAL;
|
|
if (copy_from_user(&mfc, optval, sizeof(mfc)))
|
|
return -EFAULT;
|
|
rtnl_lock();
|
|
if (optname == MRT_DEL_MFC)
|
|
ret = ipmr_mfc_delete(mrt, &mfc);
|
|
else
|
|
ret = ipmr_mfc_add(net, mrt, &mfc,
|
|
sk == rtnl_dereference(mrt->mroute_sk));
|
|
rtnl_unlock();
|
|
return ret;
|
|
/*
|
|
* Control PIM assert.
|
|
*/
|
|
case MRT_ASSERT:
|
|
{
|
|
int v;
|
|
if (get_user(v, (int __user *)optval))
|
|
return -EFAULT;
|
|
mrt->mroute_do_assert = (v) ? 1 : 0;
|
|
return 0;
|
|
}
|
|
#ifdef CONFIG_IP_PIMSM
|
|
case MRT_PIM:
|
|
{
|
|
int v;
|
|
|
|
if (get_user(v, (int __user *)optval))
|
|
return -EFAULT;
|
|
v = (v) ? 1 : 0;
|
|
|
|
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_IP_MROUTE_MULTIPLE_TABLES
|
|
case MRT_TABLE:
|
|
{
|
|
u32 v;
|
|
|
|
if (optlen != sizeof(u32))
|
|
return -EINVAL;
|
|
if (get_user(v, (u32 __user *)optval))
|
|
return -EFAULT;
|
|
|
|
rtnl_lock();
|
|
ret = 0;
|
|
if (sk == rtnl_dereference(mrt->mroute_sk)) {
|
|
ret = -EBUSY;
|
|
} else {
|
|
if (!ipmr_new_table(net, v))
|
|
ret = -ENOMEM;
|
|
raw_sk(sk)->ipmr_table = v;
|
|
}
|
|
rtnl_unlock();
|
|
return ret;
|
|
}
|
|
#endif
|
|
/*
|
|
* Spurious command, or MRT_VERSION which you cannot
|
|
* set.
|
|
*/
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Getsock opt support for the multicast routing system.
|
|
*/
|
|
|
|
int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
int olr;
|
|
int val;
|
|
struct net *net = sock_net(sk);
|
|
struct mr_table *mrt;
|
|
|
|
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
if (optname != MRT_VERSION &&
|
|
#ifdef CONFIG_IP_PIMSM
|
|
optname != MRT_PIM &&
|
|
#endif
|
|
optname != MRT_ASSERT)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (get_user(olr, optlen))
|
|
return -EFAULT;
|
|
|
|
olr = min_t(unsigned int, olr, sizeof(int));
|
|
if (olr < 0)
|
|
return -EINVAL;
|
|
|
|
if (put_user(olr, optlen))
|
|
return -EFAULT;
|
|
if (optname == MRT_VERSION)
|
|
val = 0x0305;
|
|
#ifdef CONFIG_IP_PIMSM
|
|
else if (optname == MRT_PIM)
|
|
val = mrt->mroute_do_pim;
|
|
#endif
|
|
else
|
|
val = mrt->mroute_do_assert;
|
|
if (copy_to_user(optval, &val, olr))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The IP multicast ioctl support routines.
|
|
*/
|
|
|
|
int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
|
|
{
|
|
struct sioc_sg_req sr;
|
|
struct sioc_vif_req vr;
|
|
struct vif_device *vif;
|
|
struct mfc_cache *c;
|
|
struct net *net = sock_net(sk);
|
|
struct mr_table *mrt;
|
|
|
|
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
switch (cmd) {
|
|
case SIOCGETVIFCNT:
|
|
if (copy_from_user(&vr, arg, sizeof(vr)))
|
|
return -EFAULT;
|
|
if (vr.vifi >= mrt->maxvif)
|
|
return -EINVAL;
|
|
read_lock(&mrt_lock);
|
|
vif = &mrt->vif_table[vr.vifi];
|
|
if (VIF_EXISTS(mrt, vr.vifi)) {
|
|
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:
|
|
if (copy_from_user(&sr, arg, sizeof(sr)))
|
|
return -EFAULT;
|
|
|
|
rcu_read_lock();
|
|
c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_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;
|
|
rcu_read_unlock();
|
|
|
|
if (copy_to_user(arg, &sr, sizeof(sr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
return -EADDRNOTAVAIL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_sioc_sg_req {
|
|
struct in_addr src;
|
|
struct in_addr grp;
|
|
compat_ulong_t pktcnt;
|
|
compat_ulong_t bytecnt;
|
|
compat_ulong_t wrong_if;
|
|
};
|
|
|
|
struct compat_sioc_vif_req {
|
|
vifi_t vifi; /* Which iface */
|
|
compat_ulong_t icount;
|
|
compat_ulong_t ocount;
|
|
compat_ulong_t ibytes;
|
|
compat_ulong_t obytes;
|
|
};
|
|
|
|
int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct compat_sioc_sg_req sr;
|
|
struct compat_sioc_vif_req vr;
|
|
struct vif_device *vif;
|
|
struct mfc_cache *c;
|
|
struct net *net = sock_net(sk);
|
|
struct mr_table *mrt;
|
|
|
|
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
switch (cmd) {
|
|
case SIOCGETVIFCNT:
|
|
if (copy_from_user(&vr, arg, sizeof(vr)))
|
|
return -EFAULT;
|
|
if (vr.vifi >= mrt->maxvif)
|
|
return -EINVAL;
|
|
read_lock(&mrt_lock);
|
|
vif = &mrt->vif_table[vr.vifi];
|
|
if (VIF_EXISTS(mrt, vr.vifi)) {
|
|
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:
|
|
if (copy_from_user(&sr, arg, sizeof(sr)))
|
|
return -EFAULT;
|
|
|
|
rcu_read_lock();
|
|
c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_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;
|
|
rcu_read_unlock();
|
|
|
|
if (copy_to_user(arg, &sr, sizeof(sr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
return -EADDRNOTAVAIL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = ptr;
|
|
struct net *net = dev_net(dev);
|
|
struct mr_table *mrt;
|
|
struct vif_device *v;
|
|
int ct;
|
|
|
|
if (event != NETDEV_UNREGISTER)
|
|
return NOTIFY_DONE;
|
|
|
|
ipmr_for_each_table(mrt, net) {
|
|
v = &mrt->vif_table[0];
|
|
for (ct = 0; ct < mrt->maxvif; ct++, v++) {
|
|
if (v->dev == dev)
|
|
vif_delete(mrt, ct, 1, NULL);
|
|
}
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
|
|
static struct notifier_block ip_mr_notifier = {
|
|
.notifier_call = ipmr_device_event,
|
|
};
|
|
|
|
/*
|
|
* Encapsulate a packet by attaching a valid IPIP header to it.
|
|
* This avoids tunnel drivers and other mess and gives us the speed so
|
|
* important for multicast video.
|
|
*/
|
|
|
|
static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr)
|
|
{
|
|
struct iphdr *iph;
|
|
const struct iphdr *old_iph = ip_hdr(skb);
|
|
|
|
skb_push(skb, sizeof(struct iphdr));
|
|
skb->transport_header = skb->network_header;
|
|
skb_reset_network_header(skb);
|
|
iph = ip_hdr(skb);
|
|
|
|
iph->version = 4;
|
|
iph->tos = old_iph->tos;
|
|
iph->ttl = old_iph->ttl;
|
|
iph->frag_off = 0;
|
|
iph->daddr = daddr;
|
|
iph->saddr = saddr;
|
|
iph->protocol = IPPROTO_IPIP;
|
|
iph->ihl = 5;
|
|
iph->tot_len = htons(skb->len);
|
|
ip_select_ident(iph, skb_dst(skb), NULL);
|
|
ip_send_check(iph);
|
|
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
|
nf_reset(skb);
|
|
}
|
|
|
|
static inline int ipmr_forward_finish(struct sk_buff *skb)
|
|
{
|
|
struct ip_options *opt = &(IPCB(skb)->opt);
|
|
|
|
IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS);
|
|
|
|
if (unlikely(opt->optlen))
|
|
ip_forward_options(skb);
|
|
|
|
return dst_output(skb);
|
|
}
|
|
|
|
/*
|
|
* Processing handlers for ipmr_forward
|
|
*/
|
|
|
|
static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
|
|
struct sk_buff *skb, struct mfc_cache *c, int vifi)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
struct vif_device *vif = &mrt->vif_table[vifi];
|
|
struct net_device *dev;
|
|
struct rtable *rt;
|
|
struct flowi4 fl4;
|
|
int encap = 0;
|
|
|
|
if (vif->dev == NULL)
|
|
goto out_free;
|
|
|
|
#ifdef CONFIG_IP_PIMSM
|
|
if (vif->flags & VIFF_REGISTER) {
|
|
vif->pkt_out++;
|
|
vif->bytes_out += skb->len;
|
|
vif->dev->stats.tx_bytes += skb->len;
|
|
vif->dev->stats.tx_packets++;
|
|
ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
|
|
goto out_free;
|
|
}
|
|
#endif
|
|
|
|
if (vif->flags & VIFF_TUNNEL) {
|
|
rt = ip_route_output_ports(net, &fl4, NULL,
|
|
vif->remote, vif->local,
|
|
0, 0,
|
|
IPPROTO_IPIP,
|
|
RT_TOS(iph->tos), vif->link);
|
|
if (IS_ERR(rt))
|
|
goto out_free;
|
|
encap = sizeof(struct iphdr);
|
|
} else {
|
|
rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
|
|
0, 0,
|
|
IPPROTO_IPIP,
|
|
RT_TOS(iph->tos), vif->link);
|
|
if (IS_ERR(rt))
|
|
goto out_free;
|
|
}
|
|
|
|
dev = rt->dst.dev;
|
|
|
|
if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
|
|
/* Do not fragment multicasts. Alas, IPv4 does not
|
|
* allow to send ICMP, so that packets will disappear
|
|
* to blackhole.
|
|
*/
|
|
|
|
IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
|
|
ip_rt_put(rt);
|
|
goto out_free;
|
|
}
|
|
|
|
encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
|
|
|
|
if (skb_cow(skb, encap)) {
|
|
ip_rt_put(rt);
|
|
goto out_free;
|
|
}
|
|
|
|
vif->pkt_out++;
|
|
vif->bytes_out += skb->len;
|
|
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, &rt->dst);
|
|
ip_decrease_ttl(ip_hdr(skb));
|
|
|
|
/* FIXME: forward and output firewalls used to be called here.
|
|
* What do we do with netfilter? -- RR
|
|
*/
|
|
if (vif->flags & VIFF_TUNNEL) {
|
|
ip_encap(skb, vif->local, vif->remote);
|
|
/* FIXME: extra output firewall step used to be here. --RR */
|
|
vif->dev->stats.tx_packets++;
|
|
vif->dev->stats.tx_bytes += skb->len;
|
|
}
|
|
|
|
IPCB(skb)->flags |= IPSKB_FORWARDED;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev,
|
|
ipmr_forward_finish);
|
|
return;
|
|
|
|
out_free:
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
|
|
{
|
|
int ct;
|
|
|
|
for (ct = mrt->maxvif-1; ct >= 0; ct--) {
|
|
if (mrt->vif_table[ct].dev == dev)
|
|
break;
|
|
}
|
|
return ct;
|
|
}
|
|
|
|
/* "local" means that we should preserve one skb (for local delivery) */
|
|
|
|
static int ip_mr_forward(struct net *net, struct mr_table *mrt,
|
|
struct sk_buff *skb, struct mfc_cache *cache,
|
|
int local)
|
|
{
|
|
int psend = -1;
|
|
int vif, ct;
|
|
|
|
vif = cache->mfc_parent;
|
|
cache->mfc_un.res.pkt++;
|
|
cache->mfc_un.res.bytes += skb->len;
|
|
|
|
/*
|
|
* Wrong interface: drop packet and (maybe) send PIM assert.
|
|
*/
|
|
if (mrt->vif_table[vif].dev != skb->dev) {
|
|
int true_vifi;
|
|
|
|
if (rt_is_output_route(skb_rtable(skb))) {
|
|
/* It is our own packet, looped back.
|
|
* Very complicated situation...
|
|
*
|
|
* The best workaround until routing daemons will be
|
|
* fixed is not to redistribute packet, if it was
|
|
* send through wrong interface. It means, that
|
|
* multicast applications WILL NOT work for
|
|
* (S,G), which have default multicast route pointing
|
|
* to wrong oif. In any case, it is not a good
|
|
* idea to use multicasting applications on router.
|
|
*/
|
|
goto dont_forward;
|
|
}
|
|
|
|
cache->mfc_un.res.wrong_if++;
|
|
true_vifi = ipmr_find_vif(mrt, skb->dev);
|
|
|
|
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;
|
|
ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
|
|
}
|
|
goto dont_forward;
|
|
}
|
|
|
|
mrt->vif_table[vif].pkt_in++;
|
|
mrt->vif_table[vif].bytes_in += skb->len;
|
|
|
|
/*
|
|
* Forward the frame
|
|
*/
|
|
for (ct = cache->mfc_un.res.maxvif - 1;
|
|
ct >= cache->mfc_un.res.minvif; ct--) {
|
|
if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
|
|
if (psend != -1) {
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (skb2)
|
|
ipmr_queue_xmit(net, mrt, skb2, cache,
|
|
psend);
|
|
}
|
|
psend = ct;
|
|
}
|
|
}
|
|
if (psend != -1) {
|
|
if (local) {
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (skb2)
|
|
ipmr_queue_xmit(net, mrt, skb2, cache, psend);
|
|
} else {
|
|
ipmr_queue_xmit(net, mrt, skb, cache, psend);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
dont_forward:
|
|
if (!local)
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
|
|
{
|
|
struct rtable *rt = skb_rtable(skb);
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
struct flowi4 fl4 = {
|
|
.daddr = iph->daddr,
|
|
.saddr = iph->saddr,
|
|
.flowi4_tos = RT_TOS(iph->tos),
|
|
.flowi4_oif = rt->rt_oif,
|
|
.flowi4_iif = rt->rt_iif,
|
|
.flowi4_mark = rt->rt_mark,
|
|
};
|
|
struct mr_table *mrt;
|
|
int err;
|
|
|
|
err = ipmr_fib_lookup(net, &fl4, &mrt);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
return mrt;
|
|
}
|
|
|
|
/*
|
|
* Multicast packets for forwarding arrive here
|
|
* Called with rcu_read_lock();
|
|
*/
|
|
|
|
int ip_mr_input(struct sk_buff *skb)
|
|
{
|
|
struct mfc_cache *cache;
|
|
struct net *net = dev_net(skb->dev);
|
|
int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
|
|
struct mr_table *mrt;
|
|
|
|
/* Packet is looped back after forward, it should not be
|
|
* forwarded second time, but still can be delivered locally.
|
|
*/
|
|
if (IPCB(skb)->flags & IPSKB_FORWARDED)
|
|
goto dont_forward;
|
|
|
|
mrt = ipmr_rt_fib_lookup(net, skb);
|
|
if (IS_ERR(mrt)) {
|
|
kfree_skb(skb);
|
|
return PTR_ERR(mrt);
|
|
}
|
|
if (!local) {
|
|
if (IPCB(skb)->opt.router_alert) {
|
|
if (ip_call_ra_chain(skb))
|
|
return 0;
|
|
} else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
|
|
/* IGMPv1 (and broken IGMPv2 implementations sort of
|
|
* Cisco IOS <= 11.2(8)) do not put router alert
|
|
* option to IGMP packets destined to routable
|
|
* groups. It is very bad, because it means
|
|
* that we can forward NO IGMP messages.
|
|
*/
|
|
struct sock *mroute_sk;
|
|
|
|
mroute_sk = rcu_dereference(mrt->mroute_sk);
|
|
if (mroute_sk) {
|
|
nf_reset(skb);
|
|
raw_rcv(mroute_sk, skb);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* already under rcu_read_lock() */
|
|
cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
|
|
|
|
/*
|
|
* No usable cache entry
|
|
*/
|
|
if (cache == NULL) {
|
|
int vif;
|
|
|
|
if (local) {
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
ip_local_deliver(skb);
|
|
if (skb2 == NULL)
|
|
return -ENOBUFS;
|
|
skb = skb2;
|
|
}
|
|
|
|
read_lock(&mrt_lock);
|
|
vif = ipmr_find_vif(mrt, skb->dev);
|
|
if (vif >= 0) {
|
|
int err2 = ipmr_cache_unresolved(mrt, vif, skb);
|
|
read_unlock(&mrt_lock);
|
|
|
|
return err2;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
kfree_skb(skb);
|
|
return -ENODEV;
|
|
}
|
|
|
|
read_lock(&mrt_lock);
|
|
ip_mr_forward(net, mrt, skb, cache, local);
|
|
read_unlock(&mrt_lock);
|
|
|
|
if (local)
|
|
return ip_local_deliver(skb);
|
|
|
|
return 0;
|
|
|
|
dont_forward:
|
|
if (local)
|
|
return ip_local_deliver(skb);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_PIMSM
|
|
/* called with rcu_read_lock() */
|
|
static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
|
|
unsigned int pimlen)
|
|
{
|
|
struct net_device *reg_dev = NULL;
|
|
struct iphdr *encap;
|
|
|
|
encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
|
|
/*
|
|
* Check that:
|
|
* a. packet is really sent to a multicast group
|
|
* b. packet is not a NULL-REGISTER
|
|
* c. packet is not truncated
|
|
*/
|
|
if (!ipv4_is_multicast(encap->daddr) ||
|
|
encap->tot_len == 0 ||
|
|
ntohs(encap->tot_len) + pimlen > skb->len)
|
|
return 1;
|
|
|
|
read_lock(&mrt_lock);
|
|
if (mrt->mroute_reg_vif_num >= 0)
|
|
reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
|
|
read_unlock(&mrt_lock);
|
|
|
|
if (reg_dev == NULL)
|
|
return 1;
|
|
|
|
skb->mac_header = skb->network_header;
|
|
skb_pull(skb, (u8 *)encap - skb->data);
|
|
skb_reset_network_header(skb);
|
|
skb->protocol = htons(ETH_P_IP);
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
skb->pkt_type = PACKET_HOST;
|
|
|
|
skb_tunnel_rx(skb, reg_dev);
|
|
|
|
netif_rx(skb);
|
|
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_IP_PIMSM_V1
|
|
/*
|
|
* Handle IGMP messages of PIMv1
|
|
*/
|
|
|
|
int pim_rcv_v1(struct sk_buff *skb)
|
|
{
|
|
struct igmphdr *pim;
|
|
struct net *net = dev_net(skb->dev);
|
|
struct mr_table *mrt;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
|
|
goto drop;
|
|
|
|
pim = igmp_hdr(skb);
|
|
|
|
mrt = ipmr_rt_fib_lookup(net, skb);
|
|
if (IS_ERR(mrt))
|
|
goto drop;
|
|
if (!mrt->mroute_do_pim ||
|
|
pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
|
|
goto drop;
|
|
|
|
if (__pim_rcv(mrt, skb, sizeof(*pim))) {
|
|
drop:
|
|
kfree_skb(skb);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_IP_PIMSM_V2
|
|
static int pim_rcv(struct sk_buff *skb)
|
|
{
|
|
struct pimreghdr *pim;
|
|
struct net *net = dev_net(skb->dev);
|
|
struct mr_table *mrt;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
|
|
goto drop;
|
|
|
|
pim = (struct pimreghdr *)skb_transport_header(skb);
|
|
if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) ||
|
|
(pim->flags & PIM_NULL_REGISTER) ||
|
|
(ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
|
|
csum_fold(skb_checksum(skb, 0, skb->len, 0))))
|
|
goto drop;
|
|
|
|
mrt = ipmr_rt_fib_lookup(net, skb);
|
|
if (IS_ERR(mrt))
|
|
goto drop;
|
|
if (__pim_rcv(mrt, skb, sizeof(*pim))) {
|
|
drop:
|
|
kfree_skb(skb);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
|
|
struct mfc_cache *c, struct rtmsg *rtm)
|
|
{
|
|
int ct;
|
|
struct rtnexthop *nhp;
|
|
u8 *b = skb_tail_pointer(skb);
|
|
struct rtattr *mp_head;
|
|
|
|
/* If cache is unresolved, don't try to parse IIF and OIF */
|
|
if (c->mfc_parent >= MAXVIFS)
|
|
return -ENOENT;
|
|
|
|
if (VIF_EXISTS(mrt, c->mfc_parent))
|
|
RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex);
|
|
|
|
mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
|
|
|
|
for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
|
|
if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
|
|
if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
|
|
goto rtattr_failure;
|
|
nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
|
|
nhp->rtnh_flags = 0;
|
|
nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
|
|
nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex;
|
|
nhp->rtnh_len = sizeof(*nhp);
|
|
}
|
|
}
|
|
mp_head->rta_type = RTA_MULTIPATH;
|
|
mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
|
|
rtm->rtm_type = RTN_MULTICAST;
|
|
return 1;
|
|
|
|
rtattr_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
int ipmr_get_route(struct net *net, struct sk_buff *skb,
|
|
__be32 saddr, __be32 daddr,
|
|
struct rtmsg *rtm, int nowait)
|
|
{
|
|
struct mfc_cache *cache;
|
|
struct mr_table *mrt;
|
|
int err;
|
|
|
|
mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
|
|
if (mrt == NULL)
|
|
return -ENOENT;
|
|
|
|
rcu_read_lock();
|
|
cache = ipmr_cache_find(mrt, saddr, daddr);
|
|
|
|
if (cache == NULL) {
|
|
struct sk_buff *skb2;
|
|
struct iphdr *iph;
|
|
struct net_device *dev;
|
|
int vif = -1;
|
|
|
|
if (nowait) {
|
|
rcu_read_unlock();
|
|
return -EAGAIN;
|
|
}
|
|
|
|
dev = skb->dev;
|
|
read_lock(&mrt_lock);
|
|
if (dev)
|
|
vif = ipmr_find_vif(mrt, dev);
|
|
if (vif < 0) {
|
|
read_unlock(&mrt_lock);
|
|
rcu_read_unlock();
|
|
return -ENODEV;
|
|
}
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb2) {
|
|
read_unlock(&mrt_lock);
|
|
rcu_read_unlock();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
skb_push(skb2, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb2);
|
|
iph = ip_hdr(skb2);
|
|
iph->ihl = sizeof(struct iphdr) >> 2;
|
|
iph->saddr = saddr;
|
|
iph->daddr = daddr;
|
|
iph->version = 0;
|
|
err = ipmr_cache_unresolved(mrt, vif, skb2);
|
|
read_unlock(&mrt_lock);
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
read_lock(&mrt_lock);
|
|
if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY))
|
|
cache->mfc_flags |= MFC_NOTIFY;
|
|
err = __ipmr_fill_mroute(mrt, skb, cache, rtm);
|
|
read_unlock(&mrt_lock);
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
|
|
u32 pid, u32 seq, struct mfc_cache *c)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct rtmsg *rtm;
|
|
|
|
nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
rtm->rtm_family = RTNL_FAMILY_IPMR;
|
|
rtm->rtm_dst_len = 32;
|
|
rtm->rtm_src_len = 32;
|
|
rtm->rtm_tos = 0;
|
|
rtm->rtm_table = mrt->id;
|
|
NLA_PUT_U32(skb, RTA_TABLE, mrt->id);
|
|
rtm->rtm_type = RTN_MULTICAST;
|
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
rtm->rtm_protocol = RTPROT_UNSPEC;
|
|
rtm->rtm_flags = 0;
|
|
|
|
NLA_PUT_BE32(skb, RTA_SRC, c->mfc_origin);
|
|
NLA_PUT_BE32(skb, RTA_DST, c->mfc_mcastgrp);
|
|
|
|
if (__ipmr_fill_mroute(mrt, skb, c, rtm) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct mr_table *mrt;
|
|
struct mfc_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];
|
|
|
|
rcu_read_lock();
|
|
ipmr_for_each_table(mrt, net) {
|
|
if (t < s_t)
|
|
goto next_table;
|
|
if (t > s_t)
|
|
s_h = 0;
|
|
for (h = s_h; h < MFC_LINES; h++) {
|
|
list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) {
|
|
if (e < s_e)
|
|
goto next_entry;
|
|
if (ipmr_fill_mroute(mrt, skb,
|
|
NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
mfc) < 0)
|
|
goto done;
|
|
next_entry:
|
|
e++;
|
|
}
|
|
e = s_e = 0;
|
|
}
|
|
s_h = 0;
|
|
next_table:
|
|
t++;
|
|
}
|
|
done:
|
|
rcu_read_unlock();
|
|
|
|
cb->args[2] = e;
|
|
cb->args[1] = h;
|
|
cb->args[0] = t;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
/*
|
|
* The /proc interfaces to multicast routing :
|
|
* /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
|
|
*/
|
|
struct ipmr_vif_iter {
|
|
struct seq_net_private p;
|
|
struct mr_table *mrt;
|
|
int ct;
|
|
};
|
|
|
|
static struct vif_device *ipmr_vif_seq_idx(struct net *net,
|
|
struct ipmr_vif_iter *iter,
|
|
loff_t pos)
|
|
{
|
|
struct mr_table *mrt = iter->mrt;
|
|
|
|
for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
|
|
if (!VIF_EXISTS(mrt, iter->ct))
|
|
continue;
|
|
if (pos-- == 0)
|
|
return &mrt->vif_table[iter->ct];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(mrt_lock)
|
|
{
|
|
struct ipmr_vif_iter *iter = seq->private;
|
|
struct net *net = seq_file_net(seq);
|
|
struct mr_table *mrt;
|
|
|
|
mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
|
|
if (mrt == NULL)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
iter->mrt = mrt;
|
|
|
|
read_lock(&mrt_lock);
|
|
return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1)
|
|
: SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct ipmr_vif_iter *iter = seq->private;
|
|
struct net *net = seq_file_net(seq);
|
|
struct mr_table *mrt = iter->mrt;
|
|
|
|
++*pos;
|
|
if (v == SEQ_START_TOKEN)
|
|
return ipmr_vif_seq_idx(net, iter, 0);
|
|
|
|
while (++iter->ct < mrt->maxvif) {
|
|
if (!VIF_EXISTS(mrt, iter->ct))
|
|
continue;
|
|
return &mrt->vif_table[iter->ct];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(mrt_lock)
|
|
{
|
|
read_unlock(&mrt_lock);
|
|
}
|
|
|
|
static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct ipmr_vif_iter *iter = seq->private;
|
|
struct mr_table *mrt = iter->mrt;
|
|
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(seq,
|
|
"Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
|
|
} else {
|
|
const struct vif_device *vif = v;
|
|
const char *name = vif->dev ? vif->dev->name : "none";
|
|
|
|
seq_printf(seq,
|
|
"%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
|
|
vif - mrt->vif_table,
|
|
name, vif->bytes_in, vif->pkt_in,
|
|
vif->bytes_out, vif->pkt_out,
|
|
vif->flags, vif->local, vif->remote);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations ipmr_vif_seq_ops = {
|
|
.start = ipmr_vif_seq_start,
|
|
.next = ipmr_vif_seq_next,
|
|
.stop = ipmr_vif_seq_stop,
|
|
.show = ipmr_vif_seq_show,
|
|
};
|
|
|
|
static int ipmr_vif_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &ipmr_vif_seq_ops,
|
|
sizeof(struct ipmr_vif_iter));
|
|
}
|
|
|
|
static const struct file_operations ipmr_vif_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ipmr_vif_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
struct ipmr_mfc_iter {
|
|
struct seq_net_private p;
|
|
struct mr_table *mrt;
|
|
struct list_head *cache;
|
|
int ct;
|
|
};
|
|
|
|
|
|
static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net,
|
|
struct ipmr_mfc_iter *it, loff_t pos)
|
|
{
|
|
struct mr_table *mrt = it->mrt;
|
|
struct mfc_cache *mfc;
|
|
|
|
rcu_read_lock();
|
|
for (it->ct = 0; it->ct < MFC_LINES; it->ct++) {
|
|
it->cache = &mrt->mfc_cache_array[it->ct];
|
|
list_for_each_entry_rcu(mfc, it->cache, list)
|
|
if (pos-- == 0)
|
|
return mfc;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
it->cache = &mrt->mfc_unres_queue;
|
|
list_for_each_entry(mfc, it->cache, list)
|
|
if (pos-- == 0)
|
|
return mfc;
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
it->cache = NULL;
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct ipmr_mfc_iter *it = seq->private;
|
|
struct net *net = seq_file_net(seq);
|
|
struct mr_table *mrt;
|
|
|
|
mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
|
|
if (mrt == NULL)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
it->mrt = mrt;
|
|
it->cache = NULL;
|
|
it->ct = 0;
|
|
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 mfc_cache *mfc = v;
|
|
struct ipmr_mfc_iter *it = seq->private;
|
|
struct net *net = seq_file_net(seq);
|
|
struct mr_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 mfc_cache, list);
|
|
|
|
if (it->cache == &mrt->mfc_unres_queue)
|
|
goto end_of_list;
|
|
|
|
BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]);
|
|
|
|
while (++it->ct < MFC_LINES) {
|
|
it->cache = &mrt->mfc_cache_array[it->ct];
|
|
if (list_empty(it->cache))
|
|
continue;
|
|
return list_first_entry(it->cache, struct mfc_cache, list);
|
|
}
|
|
|
|
/* exhausted cache_array, show unresolved */
|
|
rcu_read_unlock();
|
|
it->cache = &mrt->mfc_unres_queue;
|
|
it->ct = 0;
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
if (!list_empty(it->cache))
|
|
return list_first_entry(it->cache, struct mfc_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 mr_table *mrt = it->mrt;
|
|
|
|
if (it->cache == &mrt->mfc_unres_queue)
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
else if (it->cache == &mrt->mfc_cache_array[it->ct])
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
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 mfc_cache *mfc = v;
|
|
const struct ipmr_mfc_iter *it = seq->private;
|
|
const struct mr_table *mrt = it->mrt;
|
|
|
|
seq_printf(seq, "%08X %08X %-3hd",
|
|
(__force u32) mfc->mfc_mcastgrp,
|
|
(__force u32) mfc->mfc_origin,
|
|
mfc->mfc_parent);
|
|
|
|
if (it->cache != &mrt->mfc_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 (VIF_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 ipmr_mfc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ipmr_mfc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_IP_PIMSM_V2
|
|
static const struct net_protocol pim_protocol = {
|
|
.handler = pim_rcv,
|
|
.netns_ok = 1,
|
|
};
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Setup for IP multicast routing
|
|
*/
|
|
static int __net_init ipmr_net_init(struct net *net)
|
|
{
|
|
int err;
|
|
|
|
err = ipmr_rules_init(net);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
err = -ENOMEM;
|
|
if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops))
|
|
goto proc_vif_fail;
|
|
if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops))
|
|
goto proc_cache_fail;
|
|
#endif
|
|
return 0;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_cache_fail:
|
|
proc_net_remove(net, "ip_mr_vif");
|
|
proc_vif_fail:
|
|
ipmr_rules_exit(net);
|
|
#endif
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit ipmr_net_exit(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_net_remove(net, "ip_mr_cache");
|
|
proc_net_remove(net, "ip_mr_vif");
|
|
#endif
|
|
ipmr_rules_exit(net);
|
|
}
|
|
|
|
static struct pernet_operations ipmr_net_ops = {
|
|
.init = ipmr_net_init,
|
|
.exit = ipmr_net_exit,
|
|
};
|
|
|
|
int __init ip_mr_init(void)
|
|
{
|
|
int err;
|
|
|
|
mrt_cachep = kmem_cache_create("ip_mrt_cache",
|
|
sizeof(struct mfc_cache),
|
|
0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
|
|
NULL);
|
|
if (!mrt_cachep)
|
|
return -ENOMEM;
|
|
|
|
err = register_pernet_subsys(&ipmr_net_ops);
|
|
if (err)
|
|
goto reg_pernet_fail;
|
|
|
|
err = register_netdevice_notifier(&ip_mr_notifier);
|
|
if (err)
|
|
goto reg_notif_fail;
|
|
#ifdef CONFIG_IP_PIMSM_V2
|
|
if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
|
|
printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n");
|
|
err = -EAGAIN;
|
|
goto add_proto_fail;
|
|
}
|
|
#endif
|
|
rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
|
|
NULL, ipmr_rtm_dumproute, NULL);
|
|
return 0;
|
|
|
|
#ifdef CONFIG_IP_PIMSM_V2
|
|
add_proto_fail:
|
|
unregister_netdevice_notifier(&ip_mr_notifier);
|
|
#endif
|
|
reg_notif_fail:
|
|
unregister_pernet_subsys(&ipmr_net_ops);
|
|
reg_pernet_fail:
|
|
kmem_cache_destroy(mrt_cachep);
|
|
return err;
|
|
}
|