// SPDX-License-Identifier: GPL-2.0-or-later/* * IP multicast routing support for mrouted 3.6/3.8 * * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> * Linux Consultancy and Custom Driver Development * * Fixes: * Michael Chastain : Incorrect size of copying. * Alan Cox : Added the cache manager code * Alan Cox : Fixed the clone/copy bug and device race. * Mike McLagan : Routing by source * Malcolm Beattie : Buffer handling fixes. * Alexey Kuznetsov : Double buffer free and other fixes. * SVR Anand : Fixed several multicast bugs and problems. * Alexey Kuznetsov : Status, optimisations and more. * Brad Parker : Better behaviour on mrouted upcall * overflow. * Carlos Picoto : PIMv1 Support * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header * Relax this requirement to work with older peers. */ #include <linux/uaccess.h>#include <linux/types.h>#include <linux/cache.h>#include <linux/capability.h>#include <linux/errno.h>#include <linux/mm.h>#include <linux/kernel.h>#include <linux/fcntl.h>#include <linux/stat.h>#include <linux/socket.h>#include <linux/in.h>#include <linux/inet.h>#include <linux/netdevice.h>#include <linux/inetdevice.h>#include <linux/igmp.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/mroute.h>#include <linux/init.h>#include <linux/if_ether.h>#include <linux/slab.h>#include <net/flow.h>#include <net/net_namespace.h>#include <net/ip.h>#include <net/protocol.h>#include <linux/skbuff.h>#include <net/route.h>#include <net/icmp.h>#include <net/udp.h>#include <net/raw.h>#include <linux/notifier.h>#include <linux/if_arp.h>#include <linux/netfilter_ipv4.h>#include <linux/compat.h>#include <linux/export.h>#include <linux/rhashtable.h>#include <net/ip_tunnels.h>#include <net/checksum.h>#include <net/netlink.h>#include <net/fib_rules.h>#include <linux/netconf.h>#include <net/rtnh.h>#include <net/inet_dscp.h> #include <linux/nospec.h> struct ipmr_rule { struct fib_rule common;}; struct ipmr_result { struct mr_table *mrt;}; /* Big lock, protecting vif table, mrt cache and mroute socket state. * Note that the changes are semaphored via rtnl_lock. */ static DEFINE_SPINLOCK(mrt_lock); static struct net_device *vif_dev_read(const struct vif_device *vif){ return rcu_dereference(vif->dev);} /* Multicast router control variables */ /* Special spinlock for queue of unresolved entries */static DEFINE_SPINLOCK(mfc_unres_lock); /* We return to original Alan's scheme. Hash table of resolved * entries is changed only in process context and protected * with weak lock mrt_lock. Queue of unresolved entries is protected * with strong spinlock mfc_unres_lock. * * In this case data path is free of exclusive locks at all. */ static struct kmem_cache *mrt_cachep __ro_after_init; static struct mr_table *ipmr_new_table(struct net *net, u32 id);static void ipmr_free_table(struct mr_table *mrt, struct list_head *dev_kill_list); static void ip_mr_forward(struct net *net, struct mr_table *mrt, struct net_device *dev, struct sk_buff *skb, struct mfc_cache *cache, int local);static int ipmr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt, vifi_t vifi, int assert);static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, int cmd);static void igmpmsg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt);static void mroute_clean_tables(struct mr_table *mrt, int flags, struct list_head *dev_kill_list);static void ipmr_expire_process(struct timer_list *t); #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES#define ipmr_for_each_table(mrt, net) \ list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list, \ lockdep_rtnl_is_held() || \ list_empty(&net->ipv4.mr_tables)) static struct mr_table *ipmr_mr_table_iter(struct net *net, struct mr_table *mrt){ struct mr_table *ret; if (!mrt) ret = list_entry_rcu(net->ipv4.mr_tables.next, struct mr_table, list); else ret = list_entry_rcu(mrt->list.next, struct mr_table, list); if (&ret->list == &net->ipv4.mr_tables) return NULL; return ret;} static struct mr_table *__ipmr_get_table(struct net *net, u32 id){ struct mr_table *mrt; ipmr_for_each_table(mrt, net) { if (mrt->id == id) return mrt; } return NULL;} static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, struct mr_table **mrt){ int err; struct ipmr_result res; struct fib_lookup_arg arg = { .result = &res, .flags = FIB_LOOKUP_NOREF, }; /* update flow if oif or iif point to device enslaved to l3mdev */ l3mdev_update_flow(net, flowi4_to_flowi(flp4)); err = fib_rules_lookup(net->ipv4.mr_rules_ops, flowi4_to_flowi(flp4), 0, &arg); if (err < 0) return err; *mrt = res.mrt; return 0;} static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, int flags, struct fib_lookup_arg *arg){ struct ipmr_result *res = arg->result; struct mr_table *mrt; switch (rule->action) { case FR_ACT_TO_TBL: break; case FR_ACT_UNREACHABLE: return -ENETUNREACH; case FR_ACT_PROHIBIT: return -EACCES; case FR_ACT_BLACKHOLE: default: return -EINVAL; } arg->table = fib_rule_get_table(rule, arg); mrt = __ipmr_get_table(rule->fr_net, arg->table); if (!mrt) return -EAGAIN; res->mrt = mrt; return 0;} static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags){ return 1;} static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, struct fib_rule_hdr *frh, struct nlattr **tb, struct netlink_ext_ack *extack){ return 0;} static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, struct nlattr **tb){ return 1;} static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, struct fib_rule_hdr *frh){ frh->dst_len = 0; frh->src_len = 0; frh->tos = 0; return 0;} static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { .family = RTNL_FAMILY_IPMR, .rule_size = sizeof(struct ipmr_rule), .addr_size = sizeof(u32), .action = ipmr_rule_action, .match = ipmr_rule_match, .configure = ipmr_rule_configure, .compare = ipmr_rule_compare, .fill = ipmr_rule_fill, .nlgroup = RTNLGRP_IPV4_RULE, .owner = THIS_MODULE,}; static int __net_init ipmr_rules_init(struct net *net){ struct fib_rules_ops *ops; LIST_HEAD(dev_kill_list); struct mr_table *mrt; int err; ops = fib_rules_register(&ipmr_rules_ops_template, net); if (IS_ERR(ops)) return PTR_ERR(ops); INIT_LIST_HEAD(&net->ipv4.mr_tables); mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); if (IS_ERR(mrt)) { err = PTR_ERR(mrt); goto err1; } err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT); if (err < 0) goto err2; net->ipv4.mr_rules_ops = ops; return 0; err2: ipmr_free_table(mrt, &dev_kill_list);err1: fib_rules_unregister(ops); return err;} static void __net_exit ipmr_rules_exit(struct net *net){ fib_rules_unregister(net->ipv4.mr_rules_ops);} static void __net_exit ipmr_rules_exit_rtnl(struct net *net, struct list_head *dev_kill_list){ struct mr_table *mrt, *next; list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { list_del_rcu(&mrt->list); ipmr_free_table(mrt, dev_kill_list); }} static int ipmr_rules_dump(struct net *net, struct notifier_block *nb, struct netlink_ext_ack *extack){ return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack);} static unsigned int ipmr_rules_seq_read(const struct net *net){ return fib_rules_seq_read(net, RTNL_FAMILY_IPMR);} bool ipmr_rule_default(const struct fib_rule *rule){ return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;}EXPORT_SYMBOL(ipmr_rule_default);#elsestatic struct mr_table *ipmr_mr_table_iter(struct net *net, struct mr_table *mrt){ if (!mrt) return rcu_dereference(net->ipv4.mrt); return NULL;} static struct mr_table *__ipmr_get_table(struct net *net, u32 id){ return rcu_dereference_check(net->ipv4.mrt, lockdep_rtnl_is_held() || !rcu_access_pointer(net->ipv4.mrt));} #define ipmr_for_each_table(mrt, net) \ for (mrt = __ipmr_get_table(net, 0); mrt; mrt = NULL) static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, struct mr_table **mrt){ *mrt = rcu_dereference(net->ipv4.mrt); if (!*mrt) return -EAGAIN; return 0;} static int __net_init ipmr_rules_init(struct net *net){ struct mr_table *mrt; mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); if (IS_ERR(mrt)) return PTR_ERR(mrt); rcu_assign_pointer(net->ipv4.mrt, mrt); return 0;} static void __net_exit ipmr_rules_exit(struct net *net){} static void __net_exit ipmr_rules_exit_rtnl(struct net *net, struct list_head *dev_kill_list){ struct mr_table *mrt = rcu_dereference_protected(net->ipv4.mrt, 1); RCU_INIT_POINTER(net->ipv4.mrt, NULL); ipmr_free_table(mrt, dev_kill_list);} static int ipmr_rules_dump(struct net *net, struct notifier_block *nb, struct netlink_ext_ack *extack){ return 0;} static unsigned int ipmr_rules_seq_read(const struct net *net){ return 0;} bool ipmr_rule_default(const struct fib_rule *rule){ return true;}EXPORT_SYMBOL(ipmr_rule_default);#endif static struct mr_table *ipmr_get_table(struct net *net, u32 id){ struct mr_table *mrt; rcu_read_lock(); mrt = __ipmr_get_table(net, id); rcu_read_unlock(); return mrt;} static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg, const void *ptr){ const struct mfc_cache_cmp_arg *cmparg = arg->key; const struct mfc_cache *c = ptr; return cmparg->mfc_mcastgrp != c->mfc_mcastgrp || cmparg->mfc_origin != c->mfc_origin;} static const struct rhashtable_params ipmr_rht_params = { .head_offset = offsetof(struct mr_mfc, mnode), .key_offset = offsetof(struct mfc_cache, cmparg), .key_len = sizeof(struct mfc_cache_cmp_arg), .nelem_hint = 3, .obj_cmpfn = ipmr_hash_cmp, .automatic_shrinking = true,}; static void ipmr_new_table_set(struct mr_table *mrt, struct net *net){#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);#endif} static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = { .mfc_mcastgrp = htonl(INADDR_ANY), .mfc_origin = htonl(INADDR_ANY),}; static struct mr_table_ops ipmr_mr_table_ops = { .rht_params = &ipmr_rht_params, .cmparg_any = &ipmr_mr_table_ops_cmparg_any,}; static struct mr_table *ipmr_new_table(struct net *net, u32 id){ struct mr_table *mrt; /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ if (id != RT_TABLE_DEFAULT && id >= 1000000000) return ERR_PTR(-EINVAL); mrt = __ipmr_get_table(net, id); if (mrt) return mrt; return mr_table_alloc(net, id, &ipmr_mr_table_ops, ipmr_expire_process, ipmr_new_table_set);} static void ipmr_free_table(struct mr_table *mrt, struct list_head *dev_kill_list){ struct net *net = read_pnet(&mrt->net); LIST_HEAD(ipmr_dev_kill_list); WARN_ON_ONCE(!mr_can_free_table(net)); mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC | MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC, &ipmr_dev_kill_list); timer_shutdown_sync(&mrt->ipmr_expire_timer); mr_table_free(mrt); WARN_ON_ONCE(!net_initialized(net) && !list_empty(&ipmr_dev_kill_list)); list_splice(&ipmr_dev_kill_list, dev_kill_list);} /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ /* 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;} static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v){ struct net_device *tunnel_dev, *new_dev; struct ip_tunnel_parm_kern 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;Lines 1–500 of 3409. 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// SPDX-License-Identifier: GPL-2.0-or-later /* * IP multicast routing support for mrouted 3.6/3.8 * * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> * Linux Consultancy and Custom Driver Development * * Fixes: * Michael Chastain : Incorrect size of copying. * Alan Cox : Added the cache manager code * Alan Cox : Fixed the clone/copy bug and device race. * Mike McLagan : Routing by source * Malcolm Beattie : Buffer handling fixes. * Alexey Kuznetsov : Double buffer free and other fixes. * SVR Anand : Fixed several multicast bugs and problems. * Alexey Kuznetsov : Status, optimisations and more. * Brad Parker : Better behaviour on mrouted upcall * overflow. * Carlos Picoto : PIMv1 Support * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header * Relax this requirement to work with older peers. */ #include <linux/uaccess.h> #include <linux/types.h> #include <linux/cache.h> #include <linux/capability.h> #include <linux/errno.h> #include <linux/mm.h> #include <linux/kernel.h> #include <linux/fcntl.h> #include <linux/stat.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/inetdevice.h> #include <linux/igmp.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/mroute.h> #include <linux/init.h> #include <linux/if_ether.h> #include <linux/slab.h> #include <net/flow.h> #include <net/net_namespace.h> #include <net/ip.h> #include <net/protocol.h> #include <linux/skbuff.h> #include <net/route.h> #include <net/icmp.h> #include <net/udp.h> #include <net/raw.h> #include <linux/notifier.h> #include <linux/if_arp.h> #include <linux/netfilter_ipv4.h> #include <linux/compat.h> #include <linux/export.h> #include <linux/rhashtable.h> #include <net/ip_tunnels.h> #include <net/checksum.h> #include <net/netlink.h> #include <net/fib_rules.h> #include <linux/netconf.h> #include <net/rtnh.h> #include <net/inet_dscp.h> #include <linux/nospec.h> struct ipmr_rule { struct fib_rule common; }; struct ipmr_result { struct mr_table *mrt; }; /* Big lock, protecting vif table, mrt cache and mroute socket state. * Note that the changes are semaphored via rtnl_lock. */ static DEFINE_SPINLOCK(mrt_lock); static struct net_device *vif_dev_read(const struct vif_device *vif) { return rcu_dereference(vif->dev); } /* Multicast router control variables */ /* Special spinlock for queue of unresolved entries */ static DEFINE_SPINLOCK(mfc_unres_lock); /* We return to original Alan's scheme. Hash table of resolved * entries is changed only in process context and protected * with weak lock mrt_lock. Queue of unresolved entries is protected * with strong spinlock mfc_unres_lock. * * In this case data path is free of exclusive locks at all. */ static struct kmem_cache *mrt_cachep __ro_after_init; static struct mr_table *ipmr_new_table(struct net *net, u32 id); static void ipmr_free_table(struct mr_table *mrt, struct list_head *dev_kill_list); static void ip_mr_forward(struct net *net, struct mr_table *mrt, struct net_device *dev, struct sk_buff *skb, struct mfc_cache *cache, int local); static int ipmr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt, vifi_t vifi, int assert); static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, int cmd); static void igmpmsg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt); static void mroute_clean_tables(struct mr_table *mrt, int flags, struct list_head *dev_kill_list); static void ipmr_expire_process(struct timer_list *t); #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES #define ipmr_for_each_table(mrt, net) \ list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list, \ lockdep_rtnl_is_held() || \ list_empty(&net->ipv4.mr_tables)) static struct mr_table *ipmr_mr_table_iter(struct net *net, struct mr_table *mrt) { struct mr_table *ret; if (!mrt) ret = list_entry_rcu(net->ipv4.mr_tables.next, struct mr_table, list); else ret = list_entry_rcu(mrt->list.next, struct mr_table, list); if (&ret->list == &net->ipv4.mr_tables) return NULL; return ret; } static struct mr_table *__ipmr_get_table(struct net *net, u32 id) { struct mr_table *mrt; ipmr_for_each_table(mrt, net) { if (mrt->id == id) return mrt; } return NULL; } static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, struct mr_table **mrt) { int err; struct ipmr_result res; struct fib_lookup_arg arg = { .result = &res, .flags = FIB_LOOKUP_NOREF, }; /* update flow if oif or iif point to device enslaved to l3mdev */ l3mdev_update_flow(net, flowi4_to_flowi(flp4)); err = fib_rules_lookup(net->ipv4.mr_rules_ops, flowi4_to_flowi(flp4), 0, &arg); if (err < 0) return err; *mrt = res.mrt; return 0; } static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, int flags, struct fib_lookup_arg *arg) { struct ipmr_result *res = arg->result; struct mr_table *mrt; switch (rule->action) { case FR_ACT_TO_TBL: break; case FR_ACT_UNREACHABLE: return -ENETUNREACH; case FR_ACT_PROHIBIT: return -EACCES; case FR_ACT_BLACKHOLE: default: return -EINVAL; } arg->table = fib_rule_get_table(rule, arg); mrt = __ipmr_get_table(rule->fr_net, arg->table); if (!mrt) return -EAGAIN; res->mrt = mrt; return 0; } static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) { return 1; } static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, struct fib_rule_hdr *frh, struct nlattr **tb, struct netlink_ext_ack *extack) { return 0; } static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, struct nlattr **tb) { return 1; } static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, struct fib_rule_hdr *frh) { frh->dst_len = 0; frh->src_len = 0; frh->tos = 0; return 0; } static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { .family = RTNL_FAMILY_IPMR, .rule_size = sizeof(struct ipmr_rule), .addr_size = sizeof(u32), .action = ipmr_rule_action, .match = ipmr_rule_match, .configure = ipmr_rule_configure, .compare = ipmr_rule_compare, .fill = ipmr_rule_fill, .nlgroup = RTNLGRP_IPV4_RULE, .owner = THIS_MODULE, }; static int __net_init ipmr_rules_init(struct net *net) { struct fib_rules_ops *ops; LIST_HEAD(dev_kill_list); struct mr_table *mrt; int err; ops = fib_rules_register(&ipmr_rules_ops_template, net); if (IS_ERR(ops)) return PTR_ERR(ops); INIT_LIST_HEAD(&net->ipv4.mr_tables); mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); if (IS_ERR(mrt)) { err = PTR_ERR(mrt); goto err1; } err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT); if (err < 0) goto err2; net->ipv4.mr_rules_ops = ops; return 0; err2: ipmr_free_table(mrt, &dev_kill_list); err1: fib_rules_unregister(ops); return err; } static void __net_exit ipmr_rules_exit(struct net *net) { fib_rules_unregister(net->ipv4.mr_rules_ops); } static void __net_exit ipmr_rules_exit_rtnl(struct net *net, struct list_head *dev_kill_list) { struct mr_table *mrt, *next; list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { list_del_rcu(&mrt->list); ipmr_free_table(mrt, dev_kill_list); } } static int ipmr_rules_dump(struct net *net, struct notifier_block *nb, struct netlink_ext_ack *extack) { return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack); } static unsigned int ipmr_rules_seq_read(const struct net *net) { return fib_rules_seq_read(net, RTNL_FAMILY_IPMR); } bool ipmr_rule_default(const struct fib_rule *rule) { return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT; } EXPORT_SYMBOL(ipmr_rule_default); #else static struct mr_table *ipmr_mr_table_iter(struct net *net, struct mr_table *mrt) { if (!mrt) return rcu_dereference(net->ipv4.mrt); return NULL; } static struct mr_table *__ipmr_get_table(struct net *net, u32 id) { return rcu_dereference_check(net->ipv4.mrt, lockdep_rtnl_is_held() || !rcu_access_pointer(net->ipv4.mrt)); } #define ipmr_for_each_table(mrt, net) \ for (mrt = __ipmr_get_table(net, 0); mrt; mrt = NULL) static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, struct mr_table **mrt) { *mrt = rcu_dereference(net->ipv4.mrt); if (!*mrt) return -EAGAIN; return 0; } static int __net_init ipmr_rules_init(struct net *net) { struct mr_table *mrt; mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); if (IS_ERR(mrt)) return PTR_ERR(mrt); rcu_assign_pointer(net->ipv4.mrt, mrt); return 0; } static void __net_exit ipmr_rules_exit(struct net *net) { } static void __net_exit ipmr_rules_exit_rtnl(struct net *net, struct list_head *dev_kill_list) { struct mr_table *mrt = rcu_dereference_protected(net->ipv4.mrt, 1); RCU_INIT_POINTER(net->ipv4.mrt, NULL); ipmr_free_table(mrt, dev_kill_list); } static int ipmr_rules_dump(struct net *net, struct notifier_block *nb, struct netlink_ext_ack *extack) { return 0; } static unsigned int ipmr_rules_seq_read(const struct net *net) { return 0; } bool ipmr_rule_default(const struct fib_rule *rule) { return true; } EXPORT_SYMBOL(ipmr_rule_default); #endif static struct mr_table *ipmr_get_table(struct net *net, u32 id) { struct mr_table *mrt; rcu_read_lock(); mrt = __ipmr_get_table(net, id); rcu_read_unlock(); return mrt; } static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg, const void *ptr) { const struct mfc_cache_cmp_arg *cmparg = arg->key; const struct mfc_cache *c = ptr; return cmparg->mfc_mcastgrp != c->mfc_mcastgrp || cmparg->mfc_origin != c->mfc_origin; } static const struct rhashtable_params ipmr_rht_params = { .head_offset = offsetof(struct mr_mfc, mnode), .key_offset = offsetof(struct mfc_cache, cmparg), .key_len = sizeof(struct mfc_cache_cmp_arg), .nelem_hint = 3, .obj_cmpfn = ipmr_hash_cmp, .automatic_shrinking = true, }; static void ipmr_new_table_set(struct mr_table *mrt, struct net *net) { #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); #endif } static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = { .mfc_mcastgrp = htonl(INADDR_ANY), .mfc_origin = htonl(INADDR_ANY), }; static struct mr_table_ops ipmr_mr_table_ops = { .rht_params = &ipmr_rht_params, .cmparg_any = &ipmr_mr_table_ops_cmparg_any, }; static struct mr_table *ipmr_new_table(struct net *net, u32 id) { struct mr_table *mrt; /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ if (id != RT_TABLE_DEFAULT && id >= 1000000000) return ERR_PTR(-EINVAL); mrt = __ipmr_get_table(net, id); if (mrt) return mrt; return mr_table_alloc(net, id, &ipmr_mr_table_ops, ipmr_expire_process, ipmr_new_table_set); } static void ipmr_free_table(struct mr_table *mrt, struct list_head *dev_kill_list) { struct net *net = read_pnet(&mrt->net); LIST_HEAD(ipmr_dev_kill_list); WARN_ON_ONCE(!mr_can_free_table(net)); mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC | MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC, &ipmr_dev_kill_list); timer_shutdown_sync(&mrt->ipmr_expire_timer); mr_table_free(mrt); WARN_ON_ONCE(!net_initialized(net) && !list_empty(&ipmr_dev_kill_list)); list_splice(&ipmr_dev_kill_list, dev_kill_list); } /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ /* 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; } static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) { struct net_device *tunnel_dev, *new_dev; struct ip_tunnel_parm_kern 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;