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3148 lines
76 KiB
3148 lines
76 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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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, <[email protected]> |
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* Linux Consultancy and Custom Driver Development |
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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 <linux/uaccess.h> |
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#include <linux/types.h> |
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#include <linux/cache.h> |
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#include <linux/capability.h> |
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#include <linux/errno.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/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 <linux/rhashtable.h> |
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#include <net/ip_tunnels.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 <linux/netconf.h> |
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#include <net/rtnh.h> |
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|
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#include <linux/nospec.h> |
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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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|
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struct ipmr_result { |
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struct mr_table *mrt; |
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}; |
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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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|
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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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/* Special spinlock for queue of unresolved entries */ |
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static DEFINE_SPINLOCK(mfc_unres_lock); |
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|
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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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|
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static struct kmem_cache *mrt_cachep __ro_after_init; |
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|
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static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
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static void ipmr_free_table(struct mr_table *mrt); |
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|
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static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
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struct net_device *dev, struct sk_buff *skb, |
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struct mfc_cache *cache, 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 void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
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int cmd); |
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static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt); |
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static void mroute_clean_tables(struct mr_table *mrt, int flags); |
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static void ipmr_expire_process(struct timer_list *t); |
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|
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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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lockdep_rtnl_is_held() || \ |
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list_empty(&net->ipv4.mr_tables)) |
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|
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static struct mr_table *ipmr_mr_table_iter(struct net *net, |
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struct mr_table *mrt) |
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{ |
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struct mr_table *ret; |
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|
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if (!mrt) |
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ret = list_entry_rcu(net->ipv4.mr_tables.next, |
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struct mr_table, list); |
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else |
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ret = list_entry_rcu(mrt->list.next, |
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struct mr_table, list); |
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|
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if (&ret->list == &net->ipv4.mr_tables) |
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return NULL; |
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return ret; |
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} |
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|
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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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|
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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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|
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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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int err; |
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struct ipmr_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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|
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/* update flow if oif or iif point to device enslaved to l3mdev */ |
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l3mdev_update_flow(net, flowi4_to_flowi(flp4)); |
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|
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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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|
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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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|
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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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|
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arg->table = fib_rule_get_table(rule, arg); |
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|
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mrt = ipmr_get_table(rule->fr_net, arg->table); |
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if (!mrt) |
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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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|
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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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|
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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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|
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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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struct netlink_ext_ack *extack) |
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{ |
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return 0; |
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} |
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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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|
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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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|
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static const struct fib_rules_ops __net_initconst 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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.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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|
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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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|
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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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|
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INIT_LIST_HEAD(&net->ipv4.mr_tables); |
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|
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mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); |
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if (IS_ERR(mrt)) { |
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err = PTR_ERR(mrt); |
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goto err1; |
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} |
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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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|
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err2: |
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ipmr_free_table(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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|
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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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|
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rtnl_lock(); |
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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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ipmr_free_table(mrt); |
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} |
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fib_rules_unregister(net->ipv4.mr_rules_ops); |
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rtnl_unlock(); |
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} |
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|
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static int ipmr_rules_dump(struct net *net, struct notifier_block *nb, |
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struct netlink_ext_ack *extack) |
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{ |
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return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack); |
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} |
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|
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static unsigned int ipmr_rules_seq_read(struct net *net) |
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{ |
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return fib_rules_seq_read(net, RTNL_FAMILY_IPMR); |
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} |
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|
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bool ipmr_rule_default(const struct fib_rule *rule) |
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{ |
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return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT; |
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} |
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EXPORT_SYMBOL(ipmr_rule_default); |
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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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|
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static struct mr_table *ipmr_mr_table_iter(struct net *net, |
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struct mr_table *mrt) |
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{ |
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if (!mrt) |
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return net->ipv4.mrt; |
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return NULL; |
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} |
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|
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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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|
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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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|
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static int __net_init ipmr_rules_init(struct net *net) |
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{ |
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struct mr_table *mrt; |
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|
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mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); |
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if (IS_ERR(mrt)) |
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return PTR_ERR(mrt); |
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net->ipv4.mrt = mrt; |
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return 0; |
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} |
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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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rtnl_lock(); |
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ipmr_free_table(net->ipv4.mrt); |
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net->ipv4.mrt = NULL; |
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rtnl_unlock(); |
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} |
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|
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static int ipmr_rules_dump(struct net *net, struct notifier_block *nb, |
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struct netlink_ext_ack *extack) |
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{ |
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return 0; |
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} |
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|
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static unsigned int ipmr_rules_seq_read(struct net *net) |
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{ |
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return 0; |
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} |
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|
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bool ipmr_rule_default(const struct fib_rule *rule) |
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{ |
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return true; |
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} |
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EXPORT_SYMBOL(ipmr_rule_default); |
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#endif |
|
|
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static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg, |
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const void *ptr) |
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{ |
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const struct mfc_cache_cmp_arg *cmparg = arg->key; |
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struct mfc_cache *c = (struct mfc_cache *)ptr; |
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|
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return cmparg->mfc_mcastgrp != c->mfc_mcastgrp || |
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cmparg->mfc_origin != c->mfc_origin; |
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} |
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|
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static const struct rhashtable_params ipmr_rht_params = { |
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.head_offset = offsetof(struct mr_mfc, mnode), |
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.key_offset = offsetof(struct mfc_cache, cmparg), |
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.key_len = sizeof(struct mfc_cache_cmp_arg), |
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.nelem_hint = 3, |
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.obj_cmpfn = ipmr_hash_cmp, |
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.automatic_shrinking = true, |
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}; |
|
|
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static void ipmr_new_table_set(struct mr_table *mrt, |
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struct net *net) |
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{ |
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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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} |
|
|
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static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = { |
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.mfc_mcastgrp = htonl(INADDR_ANY), |
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.mfc_origin = htonl(INADDR_ANY), |
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}; |
|
|
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static struct mr_table_ops ipmr_mr_table_ops = { |
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.rht_params = &ipmr_rht_params, |
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.cmparg_any = &ipmr_mr_table_ops_cmparg_any, |
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}; |
|
|
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static struct mr_table *ipmr_new_table(struct net *net, u32 id) |
|
{ |
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struct mr_table *mrt; |
|
|
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/* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
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if (id != RT_TABLE_DEFAULT && id >= 1000000000) |
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return ERR_PTR(-EINVAL); |
|
|
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mrt = ipmr_get_table(net, id); |
|
if (mrt) |
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return mrt; |
|
|
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return mr_table_alloc(net, id, &ipmr_mr_table_ops, |
|
ipmr_expire_process, ipmr_new_table_set); |
|
} |
|
|
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static void ipmr_free_table(struct mr_table *mrt) |
|
{ |
|
del_timer_sync(&mrt->ipmr_expire_timer); |
|
mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC | |
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MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC); |
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rhltable_destroy(&mrt->mfc_hash); |
|
kfree(mrt); |
|
} |
|
|
|
/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
|
|
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/* Initialize ipmr pimreg/tunnel in_device */ |
|
static bool ipmr_init_vif_indev(const struct net_device *dev) |
|
{ |
|
struct in_device *in_dev; |
|
|
|
ASSERT_RTNL(); |
|
|
|
in_dev = __in_dev_get_rtnl(dev); |
|
if (!in_dev) |
|
return false; |
|
ipv4_devconf_setall(in_dev); |
|
neigh_parms_data_state_setall(in_dev->arp_parms); |
|
IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
|
|
|
return true; |
|
} |
|
|
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static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
|
{ |
|
struct net_device *tunnel_dev, *new_dev; |
|
struct ip_tunnel_parm p = { }; |
|
int err; |
|
|
|
tunnel_dev = __dev_get_by_name(net, "tunl0"); |
|
if (!tunnel_dev) |
|
goto out; |
|
|
|
p.iph.daddr = v->vifc_rmt_addr.s_addr; |
|
p.iph.saddr = v->vifc_lcl_addr.s_addr; |
|
p.iph.version = 4; |
|
p.iph.ihl = 5; |
|
p.iph.protocol = IPPROTO_IPIP; |
|
sprintf(p.name, "dvmrp%d", v->vifc_vifi); |
|
|
|
if (!tunnel_dev->netdev_ops->ndo_tunnel_ctl) |
|
goto out; |
|
err = tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p, |
|
SIOCADDTUNNEL); |
|
if (err) |
|
goto out; |
|
|
|
new_dev = __dev_get_by_name(net, p.name); |
|
if (!new_dev) |
|
goto out; |
|
|
|
new_dev->flags |= IFF_MULTICAST; |
|
if (!ipmr_init_vif_indev(new_dev)) |
|
goto out_unregister; |
|
if (dev_open(new_dev, NULL)) |
|
goto out_unregister; |
|
dev_hold(new_dev); |
|
err = dev_set_allmulti(new_dev, 1); |
|
if (err) { |
|
dev_close(new_dev); |
|
tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p, |
|
SIOCDELTUNNEL); |
|
dev_put(new_dev); |
|
new_dev = ERR_PTR(err); |
|
} |
|
return new_dev; |
|
|
|
out_unregister: |
|
unregister_netdevice(new_dev); |
|
out: |
|
return ERR_PTR(-ENOBUFS); |
|
} |
|
|
|
#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
|
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 ? : LOOPBACK_IFINDEX, |
|
.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++; |
|
ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
|
read_unlock(&mrt_lock); |
|
kfree_skb(skb); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static int reg_vif_get_iflink(const struct net_device *dev) |
|
{ |
|
return 0; |
|
} |
|
|
|
static const struct net_device_ops reg_vif_netdev_ops = { |
|
.ndo_start_xmit = reg_vif_xmit, |
|
.ndo_get_iflink = reg_vif_get_iflink, |
|
}; |
|
|
|
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->needs_free_netdev = true; |
|
dev->features |= NETIF_F_NETNS_LOCAL; |
|
} |
|
|
|
static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
|
{ |
|
struct net_device *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, NET_NAME_UNKNOWN, reg_vif_setup); |
|
|
|
if (!dev) |
|
return NULL; |
|
|
|
dev_net_set(dev, net); |
|
|
|
if (register_netdevice(dev)) { |
|
free_netdev(dev); |
|
return NULL; |
|
} |
|
|
|
if (!ipmr_init_vif_indev(dev)) |
|
goto failure; |
|
if (dev_open(dev, NULL)) |
|
goto failure; |
|
|
|
dev_hold(dev); |
|
|
|
return dev; |
|
|
|
failure: |
|
unregister_netdevice(dev); |
|
return NULL; |
|
} |
|
|
|
/* 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) |
|
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_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); |
|
|
|
netif_rx(skb); |
|
|
|
return NET_RX_SUCCESS; |
|
} |
|
#else |
|
static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
|
{ |
|
return NULL; |
|
} |
|
#endif |
|
|
|
static int call_ipmr_vif_entry_notifiers(struct net *net, |
|
enum fib_event_type event_type, |
|
struct vif_device *vif, |
|
vifi_t vif_index, u32 tb_id) |
|
{ |
|
return mr_call_vif_notifiers(net, RTNL_FAMILY_IPMR, event_type, |
|
vif, vif_index, tb_id, |
|
&net->ipv4.ipmr_seq); |
|
} |
|
|
|
static int call_ipmr_mfc_entry_notifiers(struct net *net, |
|
enum fib_event_type event_type, |
|
struct mfc_cache *mfc, u32 tb_id) |
|
{ |
|
return mr_call_mfc_notifiers(net, RTNL_FAMILY_IPMR, event_type, |
|
&mfc->_c, tb_id, &net->ipv4.ipmr_seq); |
|
} |
|
|
|
/** |
|
* vif_delete - Delete a VIF entry |
|
* @mrt: Table to delete from |
|
* @vifi: VIF identifier to delete |
|
* @notify: Set to 1, if the caller is a notifier_call |
|
* @head: if unregistering the VIF, place it on this queue |
|
*/ |
|
static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
|
struct list_head *head) |
|
{ |
|
struct net *net = read_pnet(&mrt->net); |
|
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]; |
|
|
|
if (VIF_EXISTS(mrt, vifi)) |
|
call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_DEL, v, vifi, |
|
mrt->id); |
|
|
|
write_lock_bh(&mrt_lock); |
|
dev = v->dev; |
|
v->dev = NULL; |
|
|
|
if (!dev) { |
|
write_unlock_bh(&mrt_lock); |
|
return -EADDRNOTAVAIL; |
|
} |
|
|
|
if (vifi == mrt->mroute_reg_vif_num) |
|
mrt->mroute_reg_vif_num = -1; |
|
|
|
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)--; |
|
inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, |
|
NETCONFA_MC_FORWARDING, |
|
dev->ifindex, &in_dev->cnf); |
|
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 mr_mfc *c = container_of(head, struct mr_mfc, rcu); |
|
|
|
kmem_cache_free(mrt_cachep, (struct mfc_cache *)c); |
|
} |
|
|
|
static void ipmr_cache_free(struct mfc_cache *c) |
|
{ |
|
call_rcu(&c->_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->_c.mfc_un.unres.unresolved))) { |
|
if (ip_hdr(skb)->version == 0) { |
|
struct nlmsghdr *nlh = skb_pull(skb, |
|
sizeof(struct iphdr)); |
|
nlh->nlmsg_type = NLMSG_ERROR; |
|
nlh->nlmsg_len = nlmsg_msg_size(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).portid); |
|
} else { |
|
kfree_skb(skb); |
|
} |
|
} |
|
|
|
ipmr_cache_free(c); |
|
} |
|
|
|
/* Timer process for the unresolved queue. */ |
|
static void ipmr_expire_process(struct timer_list *t) |
|
{ |
|
struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer); |
|
struct mr_mfc *c, *next; |
|
unsigned long expires; |
|
unsigned long now; |
|
|
|
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); |
|
mroute_netlink_event(mrt, (struct mfc_cache *)c, RTM_DELROUTE); |
|
ipmr_destroy_unres(mrt, (struct mfc_cache *)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 mr_mfc *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; |
|
} |
|
} |
|
cache->mfc_un.res.lastuse = jiffies; |
|
} |
|
|
|
static int vif_add(struct net *net, struct mr_table *mrt, |
|
struct vifctl *vifc, int mrtsock) |
|
{ |
|
struct netdev_phys_item_id ppid = { }; |
|
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) { |
|
case VIFF_REGISTER: |
|
if (!ipmr_pimsm_enabled()) |
|
return -EINVAL; |
|
/* 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; |
|
case VIFF_TUNNEL: |
|
dev = ipmr_new_tunnel(net, vifc); |
|
if (IS_ERR(dev)) |
|
return PTR_ERR(dev); |
|
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)) { |
|
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)++; |
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING, |
|
dev->ifindex, &in_dev->cnf); |
|
ip_rt_multicast_event(in_dev); |
|
|
|
/* Fill in the VIF structures */ |
|
vif_device_init(v, dev, vifc->vifc_rate_limit, |
|
vifc->vifc_threshold, |
|
vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0), |
|
(VIFF_TUNNEL | VIFF_REGISTER)); |
|
|
|
err = dev_get_port_parent_id(dev, &ppid, true); |
|
if (err == 0) { |
|
memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len); |
|
v->dev_parent_id.id_len = ppid.id_len; |
|
} else { |
|
v->dev_parent_id.id_len = 0; |
|
} |
|
|
|
v->local = vifc->vifc_lcl_addr.s_addr; |
|
v->remote = vifc->vifc_rmt_addr.s_addr; |
|
|
|
/* And finish update writing critical data */ |
|
write_lock_bh(&mrt_lock); |
|
v->dev = dev; |
|
if (v->flags & VIFF_REGISTER) |
|
mrt->mroute_reg_vif_num = vifi; |
|
if (vifi+1 > mrt->maxvif) |
|
mrt->maxvif = vifi+1; |
|
write_unlock_bh(&mrt_lock); |
|
call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, vifi, mrt->id); |
|
return 0; |
|
} |
|
|
|
/* called with rcu_read_lock() */ |
|
static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
|
__be32 origin, |
|
__be32 mcastgrp) |
|
{ |
|
struct mfc_cache_cmp_arg arg = { |
|
.mfc_mcastgrp = mcastgrp, |
|
.mfc_origin = origin |
|
}; |
|
|
|
return mr_mfc_find(mrt, &arg); |
|
} |
|
|
|
/* Look for a (*,G) entry */ |
|
static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, |
|
__be32 mcastgrp, int vifi) |
|
{ |
|
struct mfc_cache_cmp_arg arg = { |
|
.mfc_mcastgrp = mcastgrp, |
|
.mfc_origin = htonl(INADDR_ANY) |
|
}; |
|
|
|
if (mcastgrp == htonl(INADDR_ANY)) |
|
return mr_mfc_find_any_parent(mrt, vifi); |
|
return mr_mfc_find_any(mrt, vifi, &arg); |
|
} |
|
|
|
/* Look for a (S,G,iif) entry if parent != -1 */ |
|
static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt, |
|
__be32 origin, __be32 mcastgrp, |
|
int parent) |
|
{ |
|
struct mfc_cache_cmp_arg arg = { |
|
.mfc_mcastgrp = mcastgrp, |
|
.mfc_origin = origin, |
|
}; |
|
|
|
return mr_mfc_find_parent(mrt, &arg, parent); |
|
} |
|
|
|
/* 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->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1; |
|
c->_c.mfc_un.res.minvif = MAXVIFS; |
|
c->_c.free = ipmr_cache_free_rcu; |
|
refcount_set(&c->_c.mfc_un.res.refcount, 1); |
|
} |
|
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->_c.mfc_un.unres.unresolved); |
|
c->_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->_c.mfc_un.unres.unresolved))) { |
|
if (ip_hdr(skb)->version == 0) { |
|
struct nlmsghdr *nlh = skb_pull(skb, |
|
sizeof(struct iphdr)); |
|
|
|
if (mr_fill_mroute(mrt, skb, &c->_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); |
|
e = nlmsg_data(nlh); |
|
e->error = -EMSGSIZE; |
|
memset(&e->msg, 0, sizeof(e->msg)); |
|
} |
|
|
|
rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
|
} else { |
|
ip_mr_forward(net, mrt, skb->dev, skb, c, 0); |
|
} |
|
} |
|
} |
|
|
|
/* Bounce a cache query up to mrouted and netlink. |
|
* |
|
* Called under mrt_lock. |
|
*/ |
|
static int ipmr_cache_report(struct mr_table *mrt, |
|
struct sk_buff *pkt, vifi_t vifi, int assert) |
|
{ |
|
const int ihl = ip_hdrlen(pkt); |
|
struct sock *mroute_sk; |
|
struct igmphdr *igmp; |
|
struct igmpmsg *msg; |
|
struct sk_buff *skb; |
|
int ret; |
|
|
|
if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) |
|
skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); |
|
else |
|
skb = alloc_skb(128, GFP_ATOMIC); |
|
|
|
if (!skb) |
|
return -ENOBUFS; |
|
|
|
if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) { |
|
/* 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 = assert; |
|
msg->im_mbz = 0; |
|
if (assert == IGMPMSG_WRVIFWHOLE) { |
|
msg->im_vif = vifi; |
|
msg->im_vif_hi = vifi >> 8; |
|
} else { |
|
msg->im_vif = mrt->mroute_reg_vif_num; |
|
msg->im_vif_hi = mrt->mroute_reg_vif_num >> 8; |
|
} |
|
ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
|
ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + |
|
sizeof(struct iphdr)); |
|
} else { |
|
/* Copy the IP header */ |
|
skb_set_network_header(skb, skb->len); |
|
skb_put(skb, ihl); |
|
skb_copy_to_linear_data(skb, pkt->data, ihl); |
|
/* Flag to the kernel this is a route add */ |
|
ip_hdr(skb)->protocol = 0; |
|
msg = (struct igmpmsg *)skb_network_header(skb); |
|
msg->im_vif = vifi; |
|
msg->im_vif_hi = vifi >> 8; |
|
skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
|
/* Add our header */ |
|
igmp = skb_put(skb, sizeof(struct igmphdr)); |
|
igmp->type = assert; |
|
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) { |
|
rcu_read_unlock(); |
|
kfree_skb(skb); |
|
return -EINVAL; |
|
} |
|
|
|
igmpmsg_netlink_event(mrt, skb); |
|
|
|
/* Deliver to mrouted */ |
|
ret = sock_queue_rcv_skb(mroute_sk, skb); |
|
rcu_read_unlock(); |
|
if (ret < 0) { |
|
net_warn_ratelimited("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, struct net_device *dev) |
|
{ |
|
const struct iphdr *iph = ip_hdr(skb); |
|
struct mfc_cache *c; |
|
bool found = false; |
|
int err; |
|
|
|
spin_lock_bh(&mfc_unres_lock); |
|
list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) { |
|
if (c->mfc_mcastgrp == iph->daddr && |
|
c->mfc_origin == iph->saddr) { |
|
found = true; |
|
break; |
|
} |
|
} |
|
|
|
if (!found) { |
|
/* Create a new entry if allowable */ |
|
c = ipmr_cache_alloc_unres(); |
|
if (!c) { |
|
spin_unlock_bh(&mfc_unres_lock); |
|
|
|
kfree_skb(skb); |
|
return -ENOBUFS; |
|
} |
|
|
|
/* Fill in the new cache entry */ |
|
c->_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->_c.list, &mrt->mfc_unres_queue); |
|
mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
|
|
|
if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
|
mod_timer(&mrt->ipmr_expire_timer, |
|
c->_c.mfc_un.unres.expires); |
|
} |
|
|
|
/* See if we can append the packet */ |
|
if (c->_c.mfc_un.unres.unresolved.qlen > 3) { |
|
kfree_skb(skb); |
|
err = -ENOBUFS; |
|
} else { |
|
if (dev) { |
|
skb->dev = dev; |
|
skb->skb_iif = dev->ifindex; |
|
} |
|
skb_queue_tail(&c->_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 parent) |
|
{ |
|
struct net *net = read_pnet(&mrt->net); |
|
struct mfc_cache *c; |
|
|
|
/* The entries are added/deleted only under RTNL */ |
|
rcu_read_lock(); |
|
c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, |
|
mfc->mfcc_mcastgrp.s_addr, parent); |
|
rcu_read_unlock(); |
|
if (!c) |
|
return -ENOENT; |
|
rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params); |
|
list_del_rcu(&c->_c.list); |
|
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id); |
|
mroute_netlink_event(mrt, c, RTM_DELROUTE); |
|
mr_cache_put(&c->_c); |
|
|
|
return 0; |
|
} |
|
|
|
static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
|
struct mfcctl *mfc, int mrtsock, int parent) |
|
{ |
|
struct mfc_cache *uc, *c; |
|
struct mr_mfc *_uc; |
|
bool found; |
|
int ret; |
|
|
|
if (mfc->mfcc_parent >= MAXVIFS) |
|
return -ENFILE; |
|
|
|
/* The entries are added/deleted only under RTNL */ |
|
rcu_read_lock(); |
|
c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, |
|
mfc->mfcc_mcastgrp.s_addr, parent); |
|
rcu_read_unlock(); |
|
if (c) { |
|
write_lock_bh(&mrt_lock); |
|
c->_c.mfc_parent = mfc->mfcc_parent; |
|
ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls); |
|
if (!mrtsock) |
|
c->_c.mfc_flags |= MFC_STATIC; |
|
write_unlock_bh(&mrt_lock); |
|
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c, |
|
mrt->id); |
|
mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
|
return 0; |
|
} |
|
|
|
if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
|
!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
|
return -EINVAL; |
|
|
|
c = ipmr_cache_alloc(); |
|
if (!c) |
|
return -ENOMEM; |
|
|
|
c->mfc_origin = mfc->mfcc_origin.s_addr; |
|
c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; |
|
c->_c.mfc_parent = mfc->mfcc_parent; |
|
ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls); |
|
if (!mrtsock) |
|
c->_c.mfc_flags |= MFC_STATIC; |
|
|
|
ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode, |
|
ipmr_rht_params); |
|
if (ret) { |
|
pr_err("ipmr: rhtable insert error %d\n", ret); |
|
ipmr_cache_free(c); |
|
return ret; |
|
} |
|
list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list); |
|
/* 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) { |
|
uc = (struct mfc_cache *)_uc; |
|
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); |
|
} |
|
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id); |
|
mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
|
return 0; |
|
} |
|
|
|
/* Close the multicast socket, and clear the vif tables etc */ |
|
static void mroute_clean_tables(struct mr_table *mrt, int flags) |
|
{ |
|
struct net *net = read_pnet(&mrt->net); |
|
struct mr_mfc *c, *tmp; |
|
struct mfc_cache *cache; |
|
LIST_HEAD(list); |
|
int i; |
|
|
|
/* Shut down all active vif entries */ |
|
if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) { |
|
for (i = 0; i < mrt->maxvif; i++) { |
|
if (((mrt->vif_table[i].flags & VIFF_STATIC) && |
|
!(flags & MRT_FLUSH_VIFS_STATIC)) || |
|
(!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS))) |
|
continue; |
|
vif_delete(mrt, i, 0, &list); |
|
} |
|
unregister_netdevice_many(&list); |
|
} |
|
|
|
/* Wipe the cache */ |
|
if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) { |
|
list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) { |
|
if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) || |
|
(!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC))) |
|
continue; |
|
rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params); |
|
list_del_rcu(&c->list); |
|
cache = (struct mfc_cache *)c; |
|
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache, |
|
mrt->id); |
|
mroute_netlink_event(mrt, cache, RTM_DELROUTE); |
|
mr_cache_put(c); |
|
} |
|
} |
|
|
|
if (flags & MRT_FLUSH_MFC) { |
|
if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
|
spin_lock_bh(&mfc_unres_lock); |
|
list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) { |
|
list_del(&c->list); |
|
cache = (struct mfc_cache *)c; |
|
mroute_netlink_event(mrt, cache, RTM_DELROUTE); |
|
ipmr_destroy_unres(mrt, cache); |
|
} |
|
spin_unlock_bh(&mfc_unres_lock); |
|
} |
|
} |
|
} |
|
|
|
/* called from ip_ra_control(), before an RCU grace period, |
|
* we don't 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)--; |
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
|
NETCONFA_MC_FORWARDING, |
|
NETCONFA_IFINDEX_ALL, |
|
net->ipv4.devconf_all); |
|
RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
|
mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC); |
|
} |
|
} |
|
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, sockptr_t optval, |
|
unsigned int optlen) |
|
{ |
|
struct net *net = sock_net(sk); |
|
int val, ret = 0, parent = 0; |
|
struct mr_table *mrt; |
|
struct vifctl vif; |
|
struct mfcctl mfc; |
|
bool do_wrvifwhole; |
|
u32 uval; |
|
|
|
/* There's one exception to the lock - MRT_DONE which needs to unlock */ |
|
rtnl_lock(); |
|
if (sk->sk_type != SOCK_RAW || |
|
inet_sk(sk)->inet_num != IPPROTO_IGMP) { |
|
ret = -EOPNOTSUPP; |
|
goto out_unlock; |
|
} |
|
|
|
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
|
if (!mrt) { |
|
ret = -ENOENT; |
|
goto out_unlock; |
|
} |
|
if (optname != MRT_INIT) { |
|
if (sk != rcu_access_pointer(mrt->mroute_sk) && |
|
!ns_capable(net->user_ns, CAP_NET_ADMIN)) { |
|
ret = -EACCES; |
|
goto out_unlock; |
|
} |
|
} |
|
|
|
switch (optname) { |
|
case MRT_INIT: |
|
if (optlen != sizeof(int)) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (rtnl_dereference(mrt->mroute_sk)) { |
|
ret = -EADDRINUSE; |
|
break; |
|
} |
|
|
|
ret = ip_ra_control(sk, 1, mrtsock_destruct); |
|
if (ret == 0) { |
|
rcu_assign_pointer(mrt->mroute_sk, sk); |
|
IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
|
NETCONFA_MC_FORWARDING, |
|
NETCONFA_IFINDEX_ALL, |
|
net->ipv4.devconf_all); |
|
} |
|
break; |
|
case MRT_DONE: |
|
if (sk != rcu_access_pointer(mrt->mroute_sk)) { |
|
ret = -EACCES; |
|
} else { |
|
/* We need to unlock here because mrtsock_destruct takes |
|
* care of rtnl itself and we can't change that due to |
|
* the IP_ROUTER_ALERT setsockopt which runs without it. |
|
*/ |
|
rtnl_unlock(); |
|
ret = ip_ra_control(sk, 0, NULL); |
|
goto out; |
|
} |
|
break; |
|
case MRT_ADD_VIF: |
|
case MRT_DEL_VIF: |
|
if (optlen != sizeof(vif)) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (copy_from_sockptr(&vif, optval, sizeof(vif))) { |
|
ret = -EFAULT; |
|
break; |
|
} |
|
if (vif.vifc_vifi >= MAXVIFS) { |
|
ret = -ENFILE; |
|
break; |
|
} |
|
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); |
|
} |
|
break; |
|
/* Manipulate the forwarding caches. These live |
|
* in a sort of kernel/user symbiosis. |
|
*/ |
|
case MRT_ADD_MFC: |
|
case MRT_DEL_MFC: |
|
parent = -1; |
|
fallthrough; |
|
case MRT_ADD_MFC_PROXY: |
|
case MRT_DEL_MFC_PROXY: |
|
if (optlen != sizeof(mfc)) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (copy_from_sockptr(&mfc, optval, sizeof(mfc))) { |
|
ret = -EFAULT; |
|
break; |
|
} |
|
if (parent == 0) |
|
parent = mfc.mfcc_parent; |
|
if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
|
ret = ipmr_mfc_delete(mrt, &mfc, parent); |
|
else |
|
ret = ipmr_mfc_add(net, mrt, &mfc, |
|
sk == rtnl_dereference(mrt->mroute_sk), |
|
parent); |
|
break; |
|
case MRT_FLUSH: |
|
if (optlen != sizeof(val)) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) { |
|
ret = -EFAULT; |
|
break; |
|
} |
|
mroute_clean_tables(mrt, val); |
|
break; |
|
/* Control PIM assert. */ |
|
case MRT_ASSERT: |
|
if (optlen != sizeof(val)) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) { |
|
ret = -EFAULT; |
|
break; |
|
} |
|
mrt->mroute_do_assert = val; |
|
break; |
|
case MRT_PIM: |
|
if (!ipmr_pimsm_enabled()) { |
|
ret = -ENOPROTOOPT; |
|
break; |
|
} |
|
if (optlen != sizeof(val)) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) { |
|
ret = -EFAULT; |
|
break; |
|
} |
|
|
|
do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE); |
|
val = !!val; |
|
if (val != mrt->mroute_do_pim) { |
|
mrt->mroute_do_pim = val; |
|
mrt->mroute_do_assert = val; |
|
mrt->mroute_do_wrvifwhole = do_wrvifwhole; |
|
} |
|
break; |
|
case MRT_TABLE: |
|
if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) { |
|
ret = -ENOPROTOOPT; |
|
break; |
|
} |
|
if (optlen != sizeof(uval)) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (copy_from_sockptr(&uval, optval, sizeof(uval))) { |
|
ret = -EFAULT; |
|
break; |
|
} |
|
|
|
if (sk == rtnl_dereference(mrt->mroute_sk)) { |
|
ret = -EBUSY; |
|
} else { |
|
mrt = ipmr_new_table(net, uval); |
|
if (IS_ERR(mrt)) |
|
ret = PTR_ERR(mrt); |
|
else |
|
raw_sk(sk)->ipmr_table = uval; |
|
} |
|
break; |
|
/* Spurious command, or MRT_VERSION which you cannot set. */ |
|
default: |
|
ret = -ENOPROTOOPT; |
|
} |
|
out_unlock: |
|
rtnl_unlock(); |
|
out: |
|
return ret; |
|
} |
|
|
|
/* 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; |
|
|
|
if (sk->sk_type != SOCK_RAW || |
|
inet_sk(sk)->inet_num != IPPROTO_IGMP) |
|
return -EOPNOTSUPP; |
|
|
|
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
|
if (!mrt) |
|
return -ENOENT; |
|
|
|
switch (optname) { |
|
case MRT_VERSION: |
|
val = 0x0305; |
|
break; |
|
case MRT_PIM: |
|
if (!ipmr_pimsm_enabled()) |
|
return -ENOPROTOOPT; |
|
val = mrt->mroute_do_pim; |
|
break; |
|
case MRT_ASSERT: |
|
val = mrt->mroute_do_assert; |
|
break; |
|
default: |
|
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 (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) |
|
return -ENOENT; |
|
|
|
switch (cmd) { |
|
case SIOCGETVIFCNT: |
|
if (copy_from_user(&vr, arg, sizeof(vr))) |
|
return -EFAULT; |
|
if (vr.vifi >= mrt->maxvif) |
|
return -EINVAL; |
|
vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif); |
|
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->_c.mfc_un.res.pkt; |
|
sr.bytecnt = c->_c.mfc_un.res.bytes; |
|
sr.wrong_if = c->_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) |
|
return -ENOENT; |
|
|
|
switch (cmd) { |
|
case SIOCGETVIFCNT: |
|
if (copy_from_user(&vr, arg, sizeof(vr))) |
|
return -EFAULT; |
|
if (vr.vifi >= mrt->maxvif) |
|
return -EINVAL; |
|
vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif); |
|
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->_c.mfc_un.res.pkt; |
|
sr.bytecnt = c->_c.mfc_un.res.bytes; |
|
sr.wrong_if = c->_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 = netdev_notifier_info_to_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 net *net, 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(net, skb, NULL); |
|
ip_send_check(iph); |
|
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
|
nf_reset_ct(skb); |
|
} |
|
|
|
static inline int ipmr_forward_finish(struct net *net, struct sock *sk, |
|
struct sk_buff *skb) |
|
{ |
|
struct ip_options *opt = &(IPCB(skb)->opt); |
|
|
|
IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS); |
|
IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len); |
|
|
|
if (unlikely(opt->optlen)) |
|
ip_forward_options(skb); |
|
|
|
return dst_output(net, sk, skb); |
|
} |
|
|
|
#ifdef CONFIG_NET_SWITCHDEV |
|
static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt, |
|
int in_vifi, int out_vifi) |
|
{ |
|
struct vif_device *out_vif = &mrt->vif_table[out_vifi]; |
|
struct vif_device *in_vif = &mrt->vif_table[in_vifi]; |
|
|
|
if (!skb->offload_l3_fwd_mark) |
|
return false; |
|
if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len) |
|
return false; |
|
return netdev_phys_item_id_same(&out_vif->dev_parent_id, |
|
&in_vif->dev_parent_id); |
|
} |
|
#else |
|
static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt, |
|
int in_vifi, int out_vifi) |
|
{ |
|
return false; |
|
} |
|
#endif |
|
|
|
/* Processing handlers for ipmr_forward */ |
|
|
|
static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
|
int in_vifi, struct sk_buff *skb, 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) |
|
goto out_free; |
|
|
|
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; |
|
} |
|
|
|
if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi)) |
|
goto out_free; |
|
|
|
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(net, 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(net, 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, |
|
net, NULL, 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 void ip_mr_forward(struct net *net, struct mr_table *mrt, |
|
struct net_device *dev, struct sk_buff *skb, |
|
struct mfc_cache *c, int local) |
|
{ |
|
int true_vifi = ipmr_find_vif(mrt, dev); |
|
int psend = -1; |
|
int vif, ct; |
|
|
|
vif = c->_c.mfc_parent; |
|
c->_c.mfc_un.res.pkt++; |
|
c->_c.mfc_un.res.bytes += skb->len; |
|
c->_c.mfc_un.res.lastuse = jiffies; |
|
|
|
if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
|
struct mfc_cache *cache_proxy; |
|
|
|
/* For an (*,G) entry, we only check that the incoming |
|
* interface is part of the static tree. |
|
*/ |
|
cache_proxy = mr_mfc_find_any_parent(mrt, vif); |
|
if (cache_proxy && |
|
cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) |
|
goto forward; |
|
} |
|
|
|
/* Wrong interface: drop packet and (maybe) send PIM assert. */ |
|
if (mrt->vif_table[vif].dev != dev) { |
|
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; |
|
} |
|
|
|
c->_c.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 || |
|
c->_c.mfc_un.res.ttls[true_vifi] < 255) && |
|
time_after(jiffies, |
|
c->_c.mfc_un.res.last_assert + |
|
MFC_ASSERT_THRESH)) { |
|
c->_c.mfc_un.res.last_assert = jiffies; |
|
ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
|
if (mrt->mroute_do_wrvifwhole) |
|
ipmr_cache_report(mrt, skb, true_vifi, |
|
IGMPMSG_WRVIFWHOLE); |
|
} |
|
goto dont_forward; |
|
} |
|
|
|
forward: |
|
mrt->vif_table[vif].pkt_in++; |
|
mrt->vif_table[vif].bytes_in += skb->len; |
|
|
|
/* Forward the frame */ |
|
if (c->mfc_origin == htonl(INADDR_ANY) && |
|
c->mfc_mcastgrp == htonl(INADDR_ANY)) { |
|
if (true_vifi >= 0 && |
|
true_vifi != c->_c.mfc_parent && |
|
ip_hdr(skb)->ttl > |
|
c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) { |
|
/* It's an (*,*) entry and the packet is not coming from |
|
* the upstream: forward the packet to the upstream |
|
* only. |
|
*/ |
|
psend = c->_c.mfc_parent; |
|
goto last_forward; |
|
} |
|
goto dont_forward; |
|
} |
|
for (ct = c->_c.mfc_un.res.maxvif - 1; |
|
ct >= c->_c.mfc_un.res.minvif; ct--) { |
|
/* For (*,G) entry, don't forward to the incoming interface */ |
|
if ((c->mfc_origin != htonl(INADDR_ANY) || |
|
ct != true_vifi) && |
|
ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) { |
|
if (psend != -1) { |
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
|
|
|
if (skb2) |
|
ipmr_queue_xmit(net, mrt, true_vifi, |
|
skb2, psend); |
|
} |
|
psend = ct; |
|
} |
|
} |
|
last_forward: |
|
if (psend != -1) { |
|
if (local) { |
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
|
|
|
if (skb2) |
|
ipmr_queue_xmit(net, mrt, true_vifi, skb2, |
|
psend); |
|
} else { |
|
ipmr_queue_xmit(net, mrt, true_vifi, skb, psend); |
|
return; |
|
} |
|
} |
|
|
|
dont_forward: |
|
if (!local) |
|
kfree_skb(skb); |
|
} |
|
|
|
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_is_output_route(rt) ? |
|
skb->dev->ifindex : 0), |
|
.flowi4_iif = (rt_is_output_route(rt) ? |
|
LOOPBACK_IFINDEX : |
|
skb->dev->ifindex), |
|
.flowi4_mark = skb->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; |
|
struct net_device *dev; |
|
|
|
/* skb->dev passed in is the loX master dev for vrfs. |
|
* As there are no vifs associated with loopback devices, |
|
* get the proper interface that does have a vif associated with it. |
|
*/ |
|
dev = skb->dev; |
|
if (netif_is_l3_master(skb->dev)) { |
|
dev = dev_get_by_index_rcu(net, IPCB(skb)->iif); |
|
if (!dev) { |
|
kfree_skb(skb); |
|
return -ENODEV; |
|
} |
|
} |
|
|
|
/* 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_ct(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); |
|
if (!cache) { |
|
int vif = ipmr_find_vif(mrt, dev); |
|
|
|
if (vif >= 0) |
|
cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, |
|
vif); |
|
} |
|
|
|
/* No usable cache entry */ |
|
if (!cache) { |
|
int vif; |
|
|
|
if (local) { |
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
|
ip_local_deliver(skb); |
|
if (!skb2) |
|
return -ENOBUFS; |
|
skb = skb2; |
|
} |
|
|
|
read_lock(&mrt_lock); |
|
vif = ipmr_find_vif(mrt, dev); |
|
if (vif >= 0) { |
|
int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev); |
|
read_unlock(&mrt_lock); |
|
|
|
return err2; |
|
} |
|
read_unlock(&mrt_lock); |
|
kfree_skb(skb); |
|
return -ENODEV; |
|
} |
|
|
|
read_lock(&mrt_lock); |
|
ip_mr_forward(net, mrt, dev, 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_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_TYPE_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 |
|
|
|
int ipmr_get_route(struct net *net, struct sk_buff *skb, |
|
__be32 saddr, __be32 daddr, |
|
struct rtmsg *rtm, u32 portid) |
|
{ |
|
struct mfc_cache *cache; |
|
struct mr_table *mrt; |
|
int err; |
|
|
|
mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
|
if (!mrt) |
|
return -ENOENT; |
|
|
|
rcu_read_lock(); |
|
cache = ipmr_cache_find(mrt, saddr, daddr); |
|
if (!cache && skb->dev) { |
|
int vif = ipmr_find_vif(mrt, skb->dev); |
|
|
|
if (vif >= 0) |
|
cache = ipmr_cache_find_any(mrt, daddr, vif); |
|
} |
|
if (!cache) { |
|
struct sk_buff *skb2; |
|
struct iphdr *iph; |
|
struct net_device *dev; |
|
int vif = -1; |
|
|
|
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_realloc_headroom(skb, sizeof(struct iphdr)); |
|
if (!skb2) { |
|
read_unlock(&mrt_lock); |
|
rcu_read_unlock(); |
|
return -ENOMEM; |
|
} |
|
|
|
NETLINK_CB(skb2).portid = portid; |
|
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, dev); |
|
read_unlock(&mrt_lock); |
|
rcu_read_unlock(); |
|
return err; |
|
} |
|
|
|
read_lock(&mrt_lock); |
|
err = mr_fill_mroute(mrt, skb, &cache->_c, rtm); |
|
read_unlock(&mrt_lock); |
|
rcu_read_unlock(); |
|
return err; |
|
} |
|
|
|
static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
|
u32 portid, u32 seq, struct mfc_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) |
|
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; |
|
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->_c.mfc_flags & MFC_STATIC) |
|
rtm->rtm_protocol = RTPROT_STATIC; |
|
else |
|
rtm->rtm_protocol = RTPROT_MROUTED; |
|
rtm->rtm_flags = 0; |
|
|
|
if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) || |
|
nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp)) |
|
goto nla_put_failure; |
|
err = mr_fill_mroute(mrt, skb, &c->_c, rtm); |
|
/* do not break the dump if cache is unresolved */ |
|
if (err < 0 && err != -ENOENT) |
|
goto nla_put_failure; |
|
|
|
nlmsg_end(skb, nlh); |
|
return 0; |
|
|
|
nla_put_failure: |
|
nlmsg_cancel(skb, nlh); |
|
return -EMSGSIZE; |
|
} |
|
|
|
static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
|
u32 portid, u32 seq, struct mr_mfc *c, int cmd, |
|
int flags) |
|
{ |
|
return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c, |
|
cmd, flags); |
|
} |
|
|
|
static size_t mroute_msgsize(bool unresolved, int maxvif) |
|
{ |
|
size_t len = |
|
NLMSG_ALIGN(sizeof(struct rtmsg)) |
|
+ nla_total_size(4) /* RTA_TABLE */ |
|
+ nla_total_size(4) /* RTA_SRC */ |
|
+ nla_total_size(4) /* 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_64bit(sizeof(struct rta_mfc_stats)) |
|
; |
|
|
|
return len; |
|
} |
|
|
|
static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
|
int cmd) |
|
{ |
|
struct net *net = read_pnet(&mrt->net); |
|
struct sk_buff *skb; |
|
int err = -ENOBUFS; |
|
|
|
skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS, |
|
mrt->maxvif), |
|
GFP_ATOMIC); |
|
if (!skb) |
|
goto errout; |
|
|
|
err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
|
if (err < 0) |
|
goto errout; |
|
|
|
rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); |
|
return; |
|
|
|
errout: |
|
kfree_skb(skb); |
|
if (err < 0) |
|
rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); |
|
} |
|
|
|
static size_t igmpmsg_netlink_msgsize(size_t payloadlen) |
|
{ |
|
size_t len = |
|
NLMSG_ALIGN(sizeof(struct rtgenmsg)) |
|
+ nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */ |
|
+ nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */ |
|
+ nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */ |
|
+ nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */ |
|
+ nla_total_size(4) /* IPMRA_CREPORT_TABLE */ |
|
/* IPMRA_CREPORT_PKT */ |
|
+ nla_total_size(payloadlen) |
|
; |
|
|
|
return len; |
|
} |
|
|
|
static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt) |
|
{ |
|
struct net *net = read_pnet(&mrt->net); |
|
struct nlmsghdr *nlh; |
|
struct rtgenmsg *rtgenm; |
|
struct igmpmsg *msg; |
|
struct sk_buff *skb; |
|
struct nlattr *nla; |
|
int payloadlen; |
|
|
|
payloadlen = pkt->len - sizeof(struct igmpmsg); |
|
msg = (struct igmpmsg *)skb_network_header(pkt); |
|
|
|
skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC); |
|
if (!skb) |
|
goto errout; |
|
|
|
nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT, |
|
sizeof(struct rtgenmsg), 0); |
|
if (!nlh) |
|
goto errout; |
|
rtgenm = nlmsg_data(nlh); |
|
rtgenm->rtgen_family = RTNL_FAMILY_IPMR; |
|
if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) || |
|
nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif | (msg->im_vif_hi << 8)) || |
|
nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR, |
|
msg->im_src.s_addr) || |
|
nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR, |
|
msg->im_dst.s_addr) || |
|
nla_put_u32(skb, IPMRA_CREPORT_TABLE, mrt->id)) |
|
goto nla_put_failure; |
|
|
|
nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen); |
|
if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg), |
|
nla_data(nla), payloadlen)) |
|
goto nla_put_failure; |
|
|
|
nlmsg_end(skb, nlh); |
|
|
|
rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC); |
|
return; |
|
|
|
nla_put_failure: |
|
nlmsg_cancel(skb, nlh); |
|
errout: |
|
kfree_skb(skb); |
|
rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS); |
|
} |
|
|
|
static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb, |
|
const struct nlmsghdr *nlh, |
|
struct nlattr **tb, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct rtmsg *rtm; |
|
int i, err; |
|
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { |
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request"); |
|
return -EINVAL; |
|
} |
|
|
|
if (!netlink_strict_get_check(skb)) |
|
return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
|
rtm_ipv4_policy, extack); |
|
|
|
rtm = nlmsg_data(nlh); |
|
if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) || |
|
(rtm->rtm_dst_len && rtm->rtm_dst_len != 32) || |
|
rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol || |
|
rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) { |
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request"); |
|
return -EINVAL; |
|
} |
|
|
|
err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
|
rtm_ipv4_policy, extack); |
|
if (err) |
|
return err; |
|
|
|
if ((tb[RTA_SRC] && !rtm->rtm_src_len) || |
|
(tb[RTA_DST] && !rtm->rtm_dst_len)) { |
|
NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4"); |
|
return -EINVAL; |
|
} |
|
|
|
for (i = 0; i <= RTA_MAX; i++) { |
|
if (!tb[i]) |
|
continue; |
|
|
|
switch (i) { |
|
case RTA_SRC: |
|
case RTA_DST: |
|
case RTA_TABLE: |
|
break; |
|
default: |
|
NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = sock_net(in_skb->sk); |
|
struct nlattr *tb[RTA_MAX + 1]; |
|
struct sk_buff *skb = NULL; |
|
struct mfc_cache *cache; |
|
struct mr_table *mrt; |
|
__be32 src, grp; |
|
u32 tableid; |
|
int err; |
|
|
|
err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
|
if (err < 0) |
|
goto errout; |
|
|
|
src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; |
|
grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; |
|
tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0; |
|
|
|
mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT); |
|
if (!mrt) { |
|
err = -ENOENT; |
|
goto errout_free; |
|
} |
|
|
|
/* entries are added/deleted only under RTNL */ |
|
rcu_read_lock(); |
|
cache = ipmr_cache_find(mrt, src, grp); |
|
rcu_read_unlock(); |
|
if (!cache) { |
|
err = -ENOENT; |
|
goto errout_free; |
|
} |
|
|
|
skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL); |
|
if (!skb) { |
|
err = -ENOBUFS; |
|
goto errout_free; |
|
} |
|
|
|
err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid, |
|
nlh->nlmsg_seq, cache, |
|
RTM_NEWROUTE, 0); |
|
if (err < 0) |
|
goto errout_free; |
|
|
|
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
|
|
|
errout: |
|
return err; |
|
|
|
errout_free: |
|
kfree_skb(skb); |
|
goto errout; |
|
} |
|
|
|
static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct fib_dump_filter filter = {}; |
|
int err; |
|
|
|
if (cb->strict_check) { |
|
err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh, |
|
&filter, cb); |
|
if (err < 0) |
|
return err; |
|
} |
|
|
|
if (filter.table_id) { |
|
struct mr_table *mrt; |
|
|
|
mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id); |
|
if (!mrt) { |
|
if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IPMR) |
|
return skb->len; |
|
|
|
NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist"); |
|
return -ENOENT; |
|
} |
|
err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute, |
|
&mfc_unres_lock, &filter); |
|
return skb->len ? : err; |
|
} |
|
|
|
return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter, |
|
_ipmr_fill_mroute, &mfc_unres_lock, &filter); |
|
} |
|
|
|
static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = { |
|
[RTA_SRC] = { .type = NLA_U32 }, |
|
[RTA_DST] = { .type = NLA_U32 }, |
|
[RTA_IIF] = { .type = NLA_U32 }, |
|
[RTA_TABLE] = { .type = NLA_U32 }, |
|
[RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
|
}; |
|
|
|
static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol) |
|
{ |
|
switch (rtm_protocol) { |
|
case RTPROT_STATIC: |
|
case RTPROT_MROUTED: |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc) |
|
{ |
|
struct rtnexthop *rtnh = nla_data(nla); |
|
int remaining = nla_len(nla), vifi = 0; |
|
|
|
while (rtnh_ok(rtnh, remaining)) { |
|
mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops; |
|
if (++vifi == MAXVIFS) |
|
break; |
|
rtnh = rtnh_next(rtnh, &remaining); |
|
} |
|
|
|
return remaining > 0 ? -EINVAL : vifi; |
|
} |
|
|
|
/* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */ |
|
static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh, |
|
struct mfcctl *mfcc, int *mrtsock, |
|
struct mr_table **mrtret, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net_device *dev = NULL; |
|
u32 tblid = RT_TABLE_DEFAULT; |
|
struct mr_table *mrt; |
|
struct nlattr *attr; |
|
struct rtmsg *rtm; |
|
int ret, rem; |
|
|
|
ret = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX, |
|
rtm_ipmr_policy, extack); |
|
if (ret < 0) |
|
goto out; |
|
rtm = nlmsg_data(nlh); |
|
|
|
ret = -EINVAL; |
|
if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 || |
|
rtm->rtm_type != RTN_MULTICAST || |
|
rtm->rtm_scope != RT_SCOPE_UNIVERSE || |
|
!ipmr_rtm_validate_proto(rtm->rtm_protocol)) |
|
goto out; |
|
|
|
memset(mfcc, 0, sizeof(*mfcc)); |
|
mfcc->mfcc_parent = -1; |
|
ret = 0; |
|
nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) { |
|
switch (nla_type(attr)) { |
|
case RTA_SRC: |
|
mfcc->mfcc_origin.s_addr = nla_get_be32(attr); |
|
break; |
|
case RTA_DST: |
|
mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr); |
|
break; |
|
case RTA_IIF: |
|
dev = __dev_get_by_index(net, nla_get_u32(attr)); |
|
if (!dev) { |
|
ret = -ENODEV; |
|
goto out; |
|
} |
|
break; |
|
case RTA_MULTIPATH: |
|
if (ipmr_nla_get_ttls(attr, mfcc) < 0) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
break; |
|
case RTA_PREFSRC: |
|
ret = 1; |
|
break; |
|
case RTA_TABLE: |
|
tblid = nla_get_u32(attr); |
|
break; |
|
} |
|
} |
|
mrt = ipmr_get_table(net, tblid); |
|
if (!mrt) { |
|
ret = -ENOENT; |
|
goto out; |
|
} |
|
*mrtret = mrt; |
|
*mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0; |
|
if (dev) |
|
mfcc->mfcc_parent = ipmr_find_vif(mrt, dev); |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/* takes care of both newroute and delroute */ |
|
static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
int ret, mrtsock, parent; |
|
struct mr_table *tbl; |
|
struct mfcctl mfcc; |
|
|
|
mrtsock = 0; |
|
tbl = NULL; |
|
ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack); |
|
if (ret < 0) |
|
return ret; |
|
|
|
parent = ret ? mfcc.mfcc_parent : -1; |
|
if (nlh->nlmsg_type == RTM_NEWROUTE) |
|
return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent); |
|
else |
|
return ipmr_mfc_delete(tbl, &mfcc, parent); |
|
} |
|
|
|
static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb) |
|
{ |
|
u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len); |
|
|
|
if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) || |
|
nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) || |
|
nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM, |
|
mrt->mroute_reg_vif_num) || |
|
nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT, |
|
mrt->mroute_do_assert) || |
|
nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) || |
|
nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE, |
|
mrt->mroute_do_wrvifwhole)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb) |
|
{ |
|
struct nlattr *vif_nest; |
|
struct vif_device *vif; |
|
|
|
/* if the VIF doesn't exist just continue */ |
|
if (!VIF_EXISTS(mrt, vifid)) |
|
return true; |
|
|
|
vif = &mrt->vif_table[vifid]; |
|
vif_nest = nla_nest_start_noflag(skb, IPMRA_VIF); |
|
if (!vif_nest) |
|
return false; |
|
if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) || |
|
nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) || |
|
nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) || |
|
nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in, |
|
IPMRA_VIFA_PAD) || |
|
nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out, |
|
IPMRA_VIFA_PAD) || |
|
nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in, |
|
IPMRA_VIFA_PAD) || |
|
nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out, |
|
IPMRA_VIFA_PAD) || |
|
nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) || |
|
nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) { |
|
nla_nest_cancel(skb, vif_nest); |
|
return false; |
|
} |
|
nla_nest_end(skb, vif_nest); |
|
|
|
return true; |
|
} |
|
|
|
static int ipmr_valid_dumplink(const struct nlmsghdr *nlh, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ifinfomsg *ifm; |
|
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { |
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump"); |
|
return -EINVAL; |
|
} |
|
|
|
if (nlmsg_attrlen(nlh, sizeof(*ifm))) { |
|
NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump"); |
|
return -EINVAL; |
|
} |
|
|
|
ifm = nlmsg_data(nlh); |
|
if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || |
|
ifm->ifi_change || ifm->ifi_index) { |
|
NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request"); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct nlmsghdr *nlh = NULL; |
|
unsigned int t = 0, s_t; |
|
unsigned int e = 0, s_e; |
|
struct mr_table *mrt; |
|
|
|
if (cb->strict_check) { |
|
int err = ipmr_valid_dumplink(cb->nlh, cb->extack); |
|
|
|
if (err < 0) |
|
return err; |
|
} |
|
|
|
s_t = cb->args[0]; |
|
s_e = cb->args[1]; |
|
|
|
ipmr_for_each_table(mrt, net) { |
|
struct nlattr *vifs, *af; |
|
struct ifinfomsg *hdr; |
|
u32 i; |
|
|
|
if (t < s_t) |
|
goto skip_table; |
|
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, |
|
cb->nlh->nlmsg_seq, RTM_NEWLINK, |
|
sizeof(*hdr), NLM_F_MULTI); |
|
if (!nlh) |
|
break; |
|
|
|
hdr = nlmsg_data(nlh); |
|
memset(hdr, 0, sizeof(*hdr)); |
|
hdr->ifi_family = RTNL_FAMILY_IPMR; |
|
|
|
af = nla_nest_start_noflag(skb, IFLA_AF_SPEC); |
|
if (!af) { |
|
nlmsg_cancel(skb, nlh); |
|
goto out; |
|
} |
|
|
|
if (!ipmr_fill_table(mrt, skb)) { |
|
nlmsg_cancel(skb, nlh); |
|
goto out; |
|
} |
|
|
|
vifs = nla_nest_start_noflag(skb, IPMRA_TABLE_VIFS); |
|
if (!vifs) { |
|
nla_nest_end(skb, af); |
|
nlmsg_end(skb, nlh); |
|
goto out; |
|
} |
|
for (i = 0; i < mrt->maxvif; i++) { |
|
if (e < s_e) |
|
goto skip_entry; |
|
if (!ipmr_fill_vif(mrt, i, skb)) { |
|
nla_nest_end(skb, vifs); |
|
nla_nest_end(skb, af); |
|
nlmsg_end(skb, nlh); |
|
goto out; |
|
} |
|
skip_entry: |
|
e++; |
|
} |
|
s_e = 0; |
|
e = 0; |
|
nla_nest_end(skb, vifs); |
|
nla_nest_end(skb, af); |
|
nlmsg_end(skb, nlh); |
|
skip_table: |
|
t++; |
|
} |
|
|
|
out: |
|
cb->args[1] = e; |
|
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 |
|
*/ |
|
|
|
static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) |
|
__acquires(mrt_lock) |
|
{ |
|
struct mr_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) |
|
return ERR_PTR(-ENOENT); |
|
|
|
iter->mrt = mrt; |
|
|
|
read_lock(&mrt_lock); |
|
return mr_vif_seq_start(seq, pos); |
|
} |
|
|
|
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 mr_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, |
|
"%2td %-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 = mr_vif_seq_next, |
|
.stop = ipmr_vif_seq_stop, |
|
.show = ipmr_vif_seq_show, |
|
}; |
|
|
|
static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) |
|
{ |
|
struct net *net = seq_file_net(seq); |
|
struct mr_table *mrt; |
|
|
|
mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
|
if (!mrt) |
|
return ERR_PTR(-ENOENT); |
|
|
|
return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_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 mfc_cache *mfc = v; |
|
const struct mr_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->_c.mfc_parent); |
|
|
|
if (it->cache != &mrt->mfc_unres_queue) { |
|
seq_printf(seq, " %8lu %8lu %8lu", |
|
mfc->_c.mfc_un.res.pkt, |
|
mfc->_c.mfc_un.res.bytes, |
|
mfc->_c.mfc_un.res.wrong_if); |
|
for (n = mfc->_c.mfc_un.res.minvif; |
|
n < mfc->_c.mfc_un.res.maxvif; n++) { |
|
if (VIF_EXISTS(mrt, n) && |
|
mfc->_c.mfc_un.res.ttls[n] < 255) |
|
seq_printf(seq, |
|
" %2d:%-3d", |
|
n, mfc->_c.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 = mr_mfc_seq_next, |
|
.stop = mr_mfc_seq_stop, |
|
.show = ipmr_mfc_seq_show, |
|
}; |
|
#endif |
|
|
|
#ifdef CONFIG_IP_PIMSM_V2 |
|
static const struct net_protocol pim_protocol = { |
|
.handler = pim_rcv, |
|
}; |
|
#endif |
|
|
|
static unsigned int ipmr_seq_read(struct net *net) |
|
{ |
|
ASSERT_RTNL(); |
|
|
|
return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net); |
|
} |
|
|
|
static int ipmr_dump(struct net *net, struct notifier_block *nb, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump, |
|
ipmr_mr_table_iter, &mrt_lock, extack); |
|
} |
|
|
|
static const struct fib_notifier_ops ipmr_notifier_ops_template = { |
|
.family = RTNL_FAMILY_IPMR, |
|
.fib_seq_read = ipmr_seq_read, |
|
.fib_dump = ipmr_dump, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
static int __net_init ipmr_notifier_init(struct net *net) |
|
{ |
|
struct fib_notifier_ops *ops; |
|
|
|
net->ipv4.ipmr_seq = 0; |
|
|
|
ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net); |
|
if (IS_ERR(ops)) |
|
return PTR_ERR(ops); |
|
net->ipv4.ipmr_notifier_ops = ops; |
|
|
|
return 0; |
|
} |
|
|
|
static void __net_exit ipmr_notifier_exit(struct net *net) |
|
{ |
|
fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops); |
|
net->ipv4.ipmr_notifier_ops = NULL; |
|
} |
|
|
|
/* Setup for IP multicast routing */ |
|
static int __net_init ipmr_net_init(struct net *net) |
|
{ |
|
int err; |
|
|
|
err = ipmr_notifier_init(net); |
|
if (err) |
|
goto ipmr_notifier_fail; |
|
|
|
err = ipmr_rules_init(net); |
|
if (err < 0) |
|
goto ipmr_rules_fail; |
|
|
|
#ifdef CONFIG_PROC_FS |
|
err = -ENOMEM; |
|
if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops, |
|
sizeof(struct mr_vif_iter))) |
|
goto proc_vif_fail; |
|
if (!proc_create_net("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops, |
|
sizeof(struct mr_mfc_iter))) |
|
goto proc_cache_fail; |
|
#endif |
|
return 0; |
|
|
|
#ifdef CONFIG_PROC_FS |
|
proc_cache_fail: |
|
remove_proc_entry("ip_mr_vif", net->proc_net); |
|
proc_vif_fail: |
|
ipmr_rules_exit(net); |
|
#endif |
|
ipmr_rules_fail: |
|
ipmr_notifier_exit(net); |
|
ipmr_notifier_fail: |
|
return err; |
|
} |
|
|
|
static void __net_exit ipmr_net_exit(struct net *net) |
|
{ |
|
#ifdef CONFIG_PROC_FS |
|
remove_proc_entry("ip_mr_cache", net->proc_net); |
|
remove_proc_entry("ip_mr_vif", net->proc_net); |
|
#endif |
|
ipmr_notifier_exit(net); |
|
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); |
|
|
|
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) { |
|
pr_err("%s: can't add PIM protocol\n", __func__); |
|
err = -EAGAIN; |
|
goto add_proto_fail; |
|
} |
|
#endif |
|
rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
|
ipmr_rtm_getroute, ipmr_rtm_dumproute, 0); |
|
rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE, |
|
ipmr_rtm_route, NULL, 0); |
|
rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE, |
|
ipmr_rtm_route, NULL, 0); |
|
|
|
rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK, |
|
NULL, ipmr_rtm_dumplink, 0); |
|
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; |
|
}
|
|
|