| /* |
| * Linux IPv6 multicast routing support for BSD pim6sd |
| * Based on net/ipv4/ipmr.c. |
| * |
| * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr> |
| * LSIIT Laboratory, Strasbourg, France |
| * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com> |
| * 6WIND, Paris, France |
| * Copyright (C)2007,2008 USAGI/WIDE Project |
| * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| */ |
| |
| #include <linux/uaccess.h> |
| #include <linux/types.h> |
| #include <linux/sched.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/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/inetdevice.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/init.h> |
| #include <linux/compat.h> |
| #include <linux/rhashtable.h> |
| #include <net/protocol.h> |
| #include <linux/skbuff.h> |
| #include <net/raw.h> |
| #include <linux/notifier.h> |
| #include <linux/if_arp.h> |
| #include <net/checksum.h> |
| #include <net/netlink.h> |
| #include <net/fib_rules.h> |
| |
| #include <net/ipv6.h> |
| #include <net/ip6_route.h> |
| #include <linux/mroute6.h> |
| #include <linux/pim.h> |
| #include <net/addrconf.h> |
| #include <linux/netfilter_ipv6.h> |
| #include <linux/export.h> |
| #include <net/ip6_checksum.h> |
| #include <linux/netconf.h> |
| #include <net/ip_tunnels.h> |
| |
| #include <linux/nospec.h> |
| |
| struct ip6mr_rule { |
| struct fib_rule common; |
| }; |
| |
| struct ip6mr_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_RWLOCK(mrt_lock); |
| |
| /* 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 __read_mostly; |
| |
| static struct mr_table *ip6mr_new_table(struct net *net, u32 id); |
| static void ip6mr_free_table(struct mr_table *mrt); |
| |
| static void ip6_mr_forward(struct net *net, struct mr_table *mrt, |
| struct net_device *dev, struct sk_buff *skb, |
| struct mfc6_cache *cache); |
| static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt, |
| mifi_t mifi, int assert); |
| static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc, |
| int cmd); |
| static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt); |
| static int ip6mr_rtm_dumproute(struct sk_buff *skb, |
| struct netlink_callback *cb); |
| static void mroute_clean_tables(struct mr_table *mrt, int flags); |
| static void ipmr_expire_process(struct timer_list *t); |
| |
| #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES |
| #define ip6mr_for_each_table(mrt, net) \ |
| list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list) |
| |
| static struct mr_table *ip6mr_mr_table_iter(struct net *net, |
| struct mr_table *mrt) |
| { |
| struct mr_table *ret; |
| |
| if (!mrt) |
| ret = list_entry_rcu(net->ipv6.mr6_tables.next, |
| struct mr_table, list); |
| else |
| ret = list_entry_rcu(mrt->list.next, |
| struct mr_table, list); |
| |
| if (&ret->list == &net->ipv6.mr6_tables) |
| return NULL; |
| return ret; |
| } |
| |
| static struct mr_table *ip6mr_get_table(struct net *net, u32 id) |
| { |
| struct mr_table *mrt; |
| |
| ip6mr_for_each_table(mrt, net) { |
| if (mrt->id == id) |
| return mrt; |
| } |
| return NULL; |
| } |
| |
| static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, |
| struct mr_table **mrt) |
| { |
| int err; |
| struct ip6mr_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, flowi6_to_flowi(flp6)); |
| |
| err = fib_rules_lookup(net->ipv6.mr6_rules_ops, |
| flowi6_to_flowi(flp6), 0, &arg); |
| if (err < 0) |
| return err; |
| *mrt = res.mrt; |
| return 0; |
| } |
| |
| static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp, |
| int flags, struct fib_lookup_arg *arg) |
| { |
| struct ip6mr_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 = ip6mr_get_table(rule->fr_net, arg->table); |
| if (!mrt) |
| return -EAGAIN; |
| res->mrt = mrt; |
| return 0; |
| } |
| |
| static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags) |
| { |
| return 1; |
| } |
| |
| static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = { |
| FRA_GENERIC_POLICY, |
| }; |
| |
| static int ip6mr_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 ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
| struct nlattr **tb) |
| { |
| return 1; |
| } |
| |
| static int ip6mr_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 ip6mr_rules_ops_template = { |
| .family = RTNL_FAMILY_IP6MR, |
| .rule_size = sizeof(struct ip6mr_rule), |
| .addr_size = sizeof(struct in6_addr), |
| .action = ip6mr_rule_action, |
| .match = ip6mr_rule_match, |
| .configure = ip6mr_rule_configure, |
| .compare = ip6mr_rule_compare, |
| .fill = ip6mr_rule_fill, |
| .nlgroup = RTNLGRP_IPV6_RULE, |
| .policy = ip6mr_rule_policy, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __net_init ip6mr_rules_init(struct net *net) |
| { |
| struct fib_rules_ops *ops; |
| struct mr_table *mrt; |
| int err; |
| |
| ops = fib_rules_register(&ip6mr_rules_ops_template, net); |
| if (IS_ERR(ops)) |
| return PTR_ERR(ops); |
| |
| INIT_LIST_HEAD(&net->ipv6.mr6_tables); |
| |
| mrt = ip6mr_new_table(net, RT6_TABLE_DFLT); |
| if (IS_ERR(mrt)) { |
| err = PTR_ERR(mrt); |
| goto err1; |
| } |
| |
| err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0); |
| if (err < 0) |
| goto err2; |
| |
| net->ipv6.mr6_rules_ops = ops; |
| return 0; |
| |
| err2: |
| ip6mr_free_table(mrt); |
| err1: |
| fib_rules_unregister(ops); |
| return err; |
| } |
| |
| static void __net_exit ip6mr_rules_exit(struct net *net) |
| { |
| struct mr_table *mrt, *next; |
| |
| rtnl_lock(); |
| list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) { |
| list_del(&mrt->list); |
| ip6mr_free_table(mrt); |
| } |
| fib_rules_unregister(net->ipv6.mr6_rules_ops); |
| rtnl_unlock(); |
| } |
| |
| static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb) |
| { |
| return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR); |
| } |
| |
| static unsigned int ip6mr_rules_seq_read(struct net *net) |
| { |
| return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR); |
| } |
| |
| bool ip6mr_rule_default(const struct fib_rule *rule) |
| { |
| return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL && |
| rule->table == RT6_TABLE_DFLT && !rule->l3mdev; |
| } |
| EXPORT_SYMBOL(ip6mr_rule_default); |
| #else |
| #define ip6mr_for_each_table(mrt, net) \ |
| for (mrt = net->ipv6.mrt6; mrt; mrt = NULL) |
| |
| static struct mr_table *ip6mr_mr_table_iter(struct net *net, |
| struct mr_table *mrt) |
| { |
| if (!mrt) |
| return net->ipv6.mrt6; |
| return NULL; |
| } |
| |
| static struct mr_table *ip6mr_get_table(struct net *net, u32 id) |
| { |
| return net->ipv6.mrt6; |
| } |
| |
| static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, |
| struct mr_table **mrt) |
| { |
| *mrt = net->ipv6.mrt6; |
| return 0; |
| } |
| |
| static int __net_init ip6mr_rules_init(struct net *net) |
| { |
| struct mr_table *mrt; |
| |
| mrt = ip6mr_new_table(net, RT6_TABLE_DFLT); |
| if (IS_ERR(mrt)) |
| return PTR_ERR(mrt); |
| net->ipv6.mrt6 = mrt; |
| return 0; |
| } |
| |
| static void __net_exit ip6mr_rules_exit(struct net *net) |
| { |
| rtnl_lock(); |
| ip6mr_free_table(net->ipv6.mrt6); |
| net->ipv6.mrt6 = NULL; |
| rtnl_unlock(); |
| } |
| |
| static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb) |
| { |
| return 0; |
| } |
| |
| static unsigned int ip6mr_rules_seq_read(struct net *net) |
| { |
| return 0; |
| } |
| #endif |
| |
| static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg, |
| const void *ptr) |
| { |
| const struct mfc6_cache_cmp_arg *cmparg = arg->key; |
| struct mfc6_cache *c = (struct mfc6_cache *)ptr; |
| |
| return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) || |
| !ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin); |
| } |
| |
| static const struct rhashtable_params ip6mr_rht_params = { |
| .head_offset = offsetof(struct mr_mfc, mnode), |
| .key_offset = offsetof(struct mfc6_cache, cmparg), |
| .key_len = sizeof(struct mfc6_cache_cmp_arg), |
| .nelem_hint = 3, |
| .obj_cmpfn = ip6mr_hash_cmp, |
| .automatic_shrinking = true, |
| }; |
| |
| static void ip6mr_new_table_set(struct mr_table *mrt, |
| struct net *net) |
| { |
| #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES |
| list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables); |
| #endif |
| } |
| |
| static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = { |
| .mf6c_origin = IN6ADDR_ANY_INIT, |
| .mf6c_mcastgrp = IN6ADDR_ANY_INIT, |
| }; |
| |
| static struct mr_table_ops ip6mr_mr_table_ops = { |
| .rht_params = &ip6mr_rht_params, |
| .cmparg_any = &ip6mr_mr_table_ops_cmparg_any, |
| }; |
| |
| static struct mr_table *ip6mr_new_table(struct net *net, u32 id) |
| { |
| struct mr_table *mrt; |
| |
| mrt = ip6mr_get_table(net, id); |
| if (mrt) |
| return mrt; |
| |
| return mr_table_alloc(net, id, &ip6mr_mr_table_ops, |
| ipmr_expire_process, ip6mr_new_table_set); |
| } |
| |
| static void ip6mr_free_table(struct mr_table *mrt) |
| { |
| del_timer_sync(&mrt->ipmr_expire_timer); |
| mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC | |
| MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC); |
| rhltable_destroy(&mrt->mfc_hash); |
| kfree(mrt); |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| /* The /proc interfaces to multicast routing |
| * /proc/ip6_mr_cache /proc/ip6_mr_vif |
| */ |
| |
| static void *ip6mr_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 = ip6mr_get_table(net, RT6_TABLE_DFLT); |
| if (!mrt) |
| return ERR_PTR(-ENOENT); |
| |
| iter->mrt = mrt; |
| |
| read_lock(&mrt_lock); |
| return mr_vif_seq_start(seq, pos); |
| } |
| |
| static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) |
| __releases(mrt_lock) |
| { |
| read_unlock(&mrt_lock); |
| } |
| |
| static int ip6mr_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\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\n", |
| vif - mrt->vif_table, |
| name, vif->bytes_in, vif->pkt_in, |
| vif->bytes_out, vif->pkt_out, |
| vif->flags); |
| } |
| return 0; |
| } |
| |
| static const struct seq_operations ip6mr_vif_seq_ops = { |
| .start = ip6mr_vif_seq_start, |
| .next = mr_vif_seq_next, |
| .stop = ip6mr_vif_seq_stop, |
| .show = ip6mr_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 = ip6mr_get_table(net, RT6_TABLE_DFLT); |
| 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 mfc6_cache *mfc = v; |
| const struct mr_mfc_iter *it = seq->private; |
| struct mr_table *mrt = it->mrt; |
| |
| seq_printf(seq, "%pI6 %pI6 %-3hd", |
| &mfc->mf6c_mcastgrp, &mfc->mf6c_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_IPV6_PIMSM_V2 |
| |
| static int pim6_rcv(struct sk_buff *skb) |
| { |
| struct pimreghdr *pim; |
| struct ipv6hdr *encap; |
| struct net_device *reg_dev = NULL; |
| struct net *net = dev_net(skb->dev); |
| struct mr_table *mrt; |
| struct flowi6 fl6 = { |
| .flowi6_iif = skb->dev->ifindex, |
| .flowi6_mark = skb->mark, |
| }; |
| int reg_vif_num; |
| |
| if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
| goto drop; |
| |
| pim = (struct pimreghdr *)skb_transport_header(skb); |
| if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) || |
| (pim->flags & PIM_NULL_REGISTER) || |
| (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
| sizeof(*pim), IPPROTO_PIM, |
| csum_partial((void *)pim, sizeof(*pim), 0)) && |
| csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
| goto drop; |
| |
| /* check if the inner packet is destined to mcast group */ |
| encap = (struct ipv6hdr *)(skb_transport_header(skb) + |
| sizeof(*pim)); |
| |
| if (!ipv6_addr_is_multicast(&encap->daddr) || |
| encap->payload_len == 0 || |
| ntohs(encap->payload_len) + sizeof(*pim) > skb->len) |
| goto drop; |
| |
| if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) |
| goto drop; |
| reg_vif_num = mrt->mroute_reg_vif_num; |
| |
| read_lock(&mrt_lock); |
| if (reg_vif_num >= 0) |
| reg_dev = mrt->vif_table[reg_vif_num].dev; |
| if (reg_dev) |
| dev_hold(reg_dev); |
| read_unlock(&mrt_lock); |
| |
| if (!reg_dev) |
| goto drop; |
| |
| skb->mac_header = skb->network_header; |
| skb_pull(skb, (u8 *)encap - skb->data); |
| skb_reset_network_header(skb); |
| skb->protocol = htons(ETH_P_IPV6); |
| skb->ip_summed = CHECKSUM_NONE; |
| |
| skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); |
| |
| netif_rx(skb); |
| |
| dev_put(reg_dev); |
| return 0; |
| drop: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static const struct inet6_protocol pim6_protocol = { |
| .handler = pim6_rcv, |
| }; |
| |
| /* Service routines creating virtual interfaces: PIMREG */ |
| |
| static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, |
| struct net_device *dev) |
| { |
| struct net *net = dev_net(dev); |
| struct mr_table *mrt; |
| struct flowi6 fl6 = { |
| .flowi6_oif = dev->ifindex, |
| .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
| .flowi6_mark = skb->mark, |
| }; |
| |
| if (!pskb_inet_may_pull(skb)) |
| goto tx_err; |
| |
| if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) |
| goto tx_err; |
| |
| read_lock(&mrt_lock); |
| dev->stats.tx_bytes += skb->len; |
| dev->stats.tx_packets++; |
| ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT); |
| read_unlock(&mrt_lock); |
| kfree_skb(skb); |
| return NETDEV_TX_OK; |
| |
| tx_err: |
| dev->stats.tx_errors++; |
| 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 = 1500 - sizeof(struct ipv6hdr) - 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 *ip6mr_reg_vif(struct net *net, struct mr_table *mrt) |
| { |
| struct net_device *dev; |
| char name[IFNAMSIZ]; |
| |
| if (mrt->id == RT6_TABLE_DFLT) |
| sprintf(name, "pim6reg"); |
| else |
| sprintf(name, "pim6reg%u", mrt->id); |
| |
| dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); |
| if (!dev) |
| return NULL; |
| |
| dev_net_set(dev, net); |
| |
| if (register_netdevice(dev)) { |
| free_netdev(dev); |
| return NULL; |
| } |
| |
| if (dev_open(dev, NULL)) |
| goto failure; |
| |
| dev_hold(dev); |
| return dev; |
| |
| failure: |
| unregister_netdevice(dev); |
| return NULL; |
| } |
| #endif |
| |
| static int call_ip6mr_vif_entry_notifiers(struct net *net, |
| enum fib_event_type event_type, |
| struct vif_device *vif, |
| mifi_t vif_index, u32 tb_id) |
| { |
| return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type, |
| vif, vif_index, tb_id, |
| &net->ipv6.ipmr_seq); |
| } |
| |
| static int call_ip6mr_mfc_entry_notifiers(struct net *net, |
| enum fib_event_type event_type, |
| struct mfc6_cache *mfc, u32 tb_id) |
| { |
| return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type, |
| &mfc->_c, tb_id, &net->ipv6.ipmr_seq); |
| } |
| |
| /* Delete a VIF entry */ |
| static int mif6_delete(struct mr_table *mrt, int vifi, int notify, |
| struct list_head *head) |
| { |
| struct vif_device *v; |
| struct net_device *dev; |
| struct inet6_dev *in6_dev; |
| |
| if (vifi < 0 || vifi >= mrt->maxvif) |
| return -EADDRNOTAVAIL; |
| |
| v = &mrt->vif_table[vifi]; |
| |
| if (VIF_EXISTS(mrt, vifi)) |
| call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->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; |
| } |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (vifi == mrt->mroute_reg_vif_num) |
| mrt->mroute_reg_vif_num = -1; |
| #endif |
| |
| if (vifi + 1 == mrt->maxvif) { |
| int tmp; |
| for (tmp = vifi - 1; tmp >= 0; tmp--) { |
| if (VIF_EXISTS(mrt, tmp)) |
| break; |
| } |
| mrt->maxvif = tmp + 1; |
| } |
| |
| write_unlock_bh(&mrt_lock); |
| |
| dev_set_allmulti(dev, -1); |
| |
| in6_dev = __in6_dev_get(dev); |
| if (in6_dev) { |
| in6_dev->cnf.mc_forwarding--; |
| inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, |
| NETCONFA_MC_FORWARDING, |
| dev->ifindex, &in6_dev->cnf); |
| } |
| |
| if ((v->flags & MIFF_REGISTER) && !notify) |
| unregister_netdevice_queue(dev, head); |
| |
| dev_put(dev); |
| return 0; |
| } |
| |
| static inline void ip6mr_cache_free_rcu(struct rcu_head *head) |
| { |
| struct mr_mfc *c = container_of(head, struct mr_mfc, rcu); |
| |
| kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c); |
| } |
| |
| static inline void ip6mr_cache_free(struct mfc6_cache *c) |
| { |
| call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu); |
| } |
| |
| /* Destroy an unresolved cache entry, killing queued skbs |
| and reporting error to netlink readers. |
| */ |
| |
| static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c) |
| { |
| struct net *net = read_pnet(&mrt->net); |
| struct sk_buff *skb; |
| |
| atomic_dec(&mrt->cache_resolve_queue_len); |
| |
| while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) { |
| if (ipv6_hdr(skb)->version == 0) { |
| struct nlmsghdr *nlh = skb_pull(skb, |
| sizeof(struct ipv6hdr)); |
| nlh->nlmsg_type = NLMSG_ERROR; |
| nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
| skb_trim(skb, nlh->nlmsg_len); |
| ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT; |
| rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
| } else |
| kfree_skb(skb); |
| } |
| |
| ip6mr_cache_free(c); |
| } |
| |
| |
| /* Timer process for all the unresolved queue. */ |
| |
| static void ipmr_do_expire_process(struct mr_table *mrt) |
| { |
| unsigned long now = jiffies; |
| unsigned long expires = 10 * HZ; |
| struct mr_mfc *c, *next; |
| |
| list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
| if (time_after(c->mfc_un.unres.expires, now)) { |
| /* not yet... */ |
| unsigned long interval = c->mfc_un.unres.expires - now; |
| if (interval < expires) |
| expires = interval; |
| continue; |
| } |
| |
| list_del(&c->list); |
| mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE); |
| ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c); |
| } |
| |
| if (!list_empty(&mrt->mfc_unres_queue)) |
| mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); |
| } |
| |
| static void ipmr_expire_process(struct timer_list *t) |
| { |
| struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer); |
| |
| if (!spin_trylock(&mfc_unres_lock)) { |
| mod_timer(&mrt->ipmr_expire_timer, jiffies + 1); |
| return; |
| } |
| |
| if (!list_empty(&mrt->mfc_unres_queue)) |
| ipmr_do_expire_process(mrt); |
| |
| spin_unlock(&mfc_unres_lock); |
| } |
| |
| /* Fill oifs list. It is called under write locked mrt_lock. */ |
| |
| static void ip6mr_update_thresholds(struct mr_table *mrt, |
| struct mr_mfc *cache, |
| unsigned char *ttls) |
| { |
| int vifi; |
| |
| cache->mfc_un.res.minvif = MAXMIFS; |
| cache->mfc_un.res.maxvif = 0; |
| memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
| |
| for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
| if (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 mif6_add(struct net *net, struct mr_table *mrt, |
| struct mif6ctl *vifc, int mrtsock) |
| { |
| int vifi = vifc->mif6c_mifi; |
| struct vif_device *v = &mrt->vif_table[vifi]; |
| struct net_device *dev; |
| struct inet6_dev *in6_dev; |
| int err; |
| |
| /* Is vif busy ? */ |
| if (VIF_EXISTS(mrt, vifi)) |
| return -EADDRINUSE; |
| |
| switch (vifc->mif6c_flags) { |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| case MIFF_REGISTER: |
| /* |
| * Special Purpose VIF in PIM |
| * All the packets will be sent to the daemon |
| */ |
| if (mrt->mroute_reg_vif_num >= 0) |
| return -EADDRINUSE; |
| dev = ip6mr_reg_vif(net, mrt); |
| if (!dev) |
| return -ENOBUFS; |
| err = dev_set_allmulti(dev, 1); |
| if (err) { |
| unregister_netdevice(dev); |
| dev_put(dev); |
| return err; |
| } |
| break; |
| #endif |
| case 0: |
| dev = dev_get_by_index(net, vifc->mif6c_pifi); |
| if (!dev) |
| return -EADDRNOTAVAIL; |
| err = dev_set_allmulti(dev, 1); |
| if (err) { |
| dev_put(dev); |
| return err; |
| } |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| in6_dev = __in6_dev_get(dev); |
| if (in6_dev) { |
| in6_dev->cnf.mc_forwarding++; |
| inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, |
| NETCONFA_MC_FORWARDING, |
| dev->ifindex, &in6_dev->cnf); |
| } |
| |
| /* Fill in the VIF structures */ |
| vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold, |
| vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0), |
| MIFF_REGISTER); |
| |
| /* And finish update writing critical data */ |
| write_lock_bh(&mrt_lock); |
| v->dev = dev; |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (v->flags & MIFF_REGISTER) |
| mrt->mroute_reg_vif_num = vifi; |
| #endif |
| if (vifi + 1 > mrt->maxvif) |
| mrt->maxvif = vifi + 1; |
| write_unlock_bh(&mrt_lock); |
| call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, |
| v, vifi, mrt->id); |
| return 0; |
| } |
| |
| static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt, |
| const struct in6_addr *origin, |
| const struct in6_addr *mcastgrp) |
| { |
| struct mfc6_cache_cmp_arg arg = { |
| .mf6c_origin = *origin, |
| .mf6c_mcastgrp = *mcastgrp, |
| }; |
| |
| return mr_mfc_find(mrt, &arg); |
| } |
| |
| /* Look for a (*,G) entry */ |
| static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt, |
| struct in6_addr *mcastgrp, |
| mifi_t mifi) |
| { |
| struct mfc6_cache_cmp_arg arg = { |
| .mf6c_origin = in6addr_any, |
| .mf6c_mcastgrp = *mcastgrp, |
| }; |
| |
| if (ipv6_addr_any(mcastgrp)) |
| return mr_mfc_find_any_parent(mrt, mifi); |
| return mr_mfc_find_any(mrt, mifi, &arg); |
| } |
| |
| /* Look for a (S,G,iif) entry if parent != -1 */ |
| static struct mfc6_cache * |
| ip6mr_cache_find_parent(struct mr_table *mrt, |
| const struct in6_addr *origin, |
| const struct in6_addr *mcastgrp, |
| int parent) |
| { |
| struct mfc6_cache_cmp_arg arg = { |
| .mf6c_origin = *origin, |
| .mf6c_mcastgrp = *mcastgrp, |
| }; |
| |
| return mr_mfc_find_parent(mrt, &arg, parent); |
| } |
| |
| /* Allocate a multicast cache entry */ |
| static struct mfc6_cache *ip6mr_cache_alloc(void) |
| { |
| struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
| if (!c) |
| return NULL; |
| c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1; |
| c->_c.mfc_un.res.minvif = MAXMIFS; |
| c->_c.free = ip6mr_cache_free_rcu; |
| refcount_set(&c->_c.mfc_un.res.refcount, 1); |
| return c; |
| } |
| |
| static struct mfc6_cache *ip6mr_cache_alloc_unres(void) |
| { |
| struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
| if (!c) |
| return NULL; |
| 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 ip6mr_cache_resolve(struct net *net, struct mr_table *mrt, |
| struct mfc6_cache *uc, struct mfc6_cache *c) |
| { |
| struct sk_buff *skb; |
| |
| /* |
| * Play the pending entries through our router |
| */ |
| |
| while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) { |
| if (ipv6_hdr(skb)->version == 0) { |
| struct nlmsghdr *nlh = skb_pull(skb, |
| sizeof(struct ipv6hdr)); |
| |
| 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); |
| ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE; |
| } |
| rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
| } else |
| ip6_mr_forward(net, mrt, skb->dev, skb, c); |
| } |
| } |
| |
| /* |
| * Bounce a cache query up to pim6sd and netlink. |
| * |
| * Called under mrt_lock. |
| */ |
| |
| static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt, |
| mifi_t mifi, int assert) |
| { |
| struct sock *mroute6_sk; |
| struct sk_buff *skb; |
| struct mrt6msg *msg; |
| int ret; |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (assert == MRT6MSG_WHOLEPKT) |
| skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) |
| +sizeof(*msg)); |
| else |
| #endif |
| skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); |
| |
| if (!skb) |
| return -ENOBUFS; |
| |
| /* I suppose that internal messages |
| * do not require checksums */ |
| |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (assert == MRT6MSG_WHOLEPKT) { |
| /* Ugly, but we have no choice with this interface. |
| Duplicate old header, fix length etc. |
| And all this only to mangle msg->im6_msgtype and |
| to set msg->im6_mbz to "mbz" :-) |
| */ |
| skb_push(skb, -skb_network_offset(pkt)); |
| |
| skb_push(skb, sizeof(*msg)); |
| skb_reset_transport_header(skb); |
| msg = (struct mrt6msg *)skb_transport_header(skb); |
| msg->im6_mbz = 0; |
| msg->im6_msgtype = MRT6MSG_WHOLEPKT; |
| msg->im6_mif = mrt->mroute_reg_vif_num; |
| msg->im6_pad = 0; |
| msg->im6_src = ipv6_hdr(pkt)->saddr; |
| msg->im6_dst = ipv6_hdr(pkt)->daddr; |
| |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| } else |
| #endif |
| { |
| /* |
| * Copy the IP header |
| */ |
| |
| skb_put(skb, sizeof(struct ipv6hdr)); |
| skb_reset_network_header(skb); |
| skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); |
| |
| /* |
| * Add our header |
| */ |
| skb_put(skb, sizeof(*msg)); |
| skb_reset_transport_header(skb); |
| msg = (struct mrt6msg *)skb_transport_header(skb); |
| |
| msg->im6_mbz = 0; |
| msg->im6_msgtype = assert; |
| msg->im6_mif = mifi; |
| msg->im6_pad = 0; |
| msg->im6_src = ipv6_hdr(pkt)->saddr; |
| msg->im6_dst = ipv6_hdr(pkt)->daddr; |
| |
| skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| } |
| |
| rcu_read_lock(); |
| mroute6_sk = rcu_dereference(mrt->mroute_sk); |
| if (!mroute6_sk) { |
| rcu_read_unlock(); |
| kfree_skb(skb); |
| return -EINVAL; |
| } |
| |
| mrt6msg_netlink_event(mrt, skb); |
| |
| /* Deliver to user space multicast routing algorithms */ |
| ret = sock_queue_rcv_skb(mroute6_sk, skb); |
| rcu_read_unlock(); |
| if (ret < 0) { |
| net_warn_ratelimited("mroute6: pending queue full, dropping entries\n"); |
| kfree_skb(skb); |
| } |
| |
| return ret; |
| } |
| |
| /* Queue a packet for resolution. It gets locked cache entry! */ |
| static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi, |
| struct sk_buff *skb, struct net_device *dev) |
| { |
| struct mfc6_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 (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
| ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) { |
| found = true; |
| break; |
| } |
| } |
| |
| if (!found) { |
| /* |
| * Create a new entry if allowable |
| */ |
| |
| if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
| (c = ip6mr_cache_alloc_unres()) == NULL) { |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| kfree_skb(skb); |
| return -ENOBUFS; |
| } |
| |
| /* Fill in the new cache entry */ |
| c->_c.mfc_parent = -1; |
| c->mf6c_origin = ipv6_hdr(skb)->saddr; |
| c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; |
| |
| /* |
| * Reflect first query at pim6sd |
| */ |
| err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE); |
| if (err < 0) { |
| /* If the report failed throw the cache entry |
| out - Brad Parker |
| */ |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| ip6mr_cache_free(c); |
| kfree_skb(skb); |
| return err; |
| } |
| |
| atomic_inc(&mrt->cache_resolve_queue_len); |
| list_add(&c->_c.list, &mrt->mfc_unres_queue); |
| mr6_netlink_event(mrt, c, RTM_NEWROUTE); |
| |
| ipmr_do_expire_process(mrt); |
| } |
| |
| /* 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; |
| } |
| |
| /* |
| * MFC6 cache manipulation by user space |
| */ |
| |
| static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc, |
| int parent) |
| { |
| struct mfc6_cache *c; |
| |
| /* The entries are added/deleted only under RTNL */ |
| rcu_read_lock(); |
| c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr, |
| &mfc->mf6cc_mcastgrp.sin6_addr, parent); |
| rcu_read_unlock(); |
| if (!c) |
| return -ENOENT; |
| rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params); |
| list_del_rcu(&c->_c.list); |
| |
| call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net), |
| FIB_EVENT_ENTRY_DEL, c, mrt->id); |
| mr6_netlink_event(mrt, c, RTM_DELROUTE); |
| mr_cache_put(&c->_c); |
| return 0; |
| } |
| |
| static int ip6mr_device_event(struct notifier_block *this, |
| unsigned long event, void *ptr) |
| { |
| struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| struct net *net = dev_net(dev); |
| struct mr_table *mrt; |
| struct vif_device *v; |
| int ct; |
| |
| if (event != NETDEV_UNREGISTER) |
| return NOTIFY_DONE; |
| |
| ip6mr_for_each_table(mrt, net) { |
| v = &mrt->vif_table[0]; |
| for (ct = 0; ct < mrt->maxvif; ct++, v++) { |
| if (v->dev == dev) |
| mif6_delete(mrt, ct, 1, NULL); |
| } |
| } |
| |
| return NOTIFY_DONE; |
| } |
| |
| static unsigned int ip6mr_seq_read(struct net *net) |
| { |
| ASSERT_RTNL(); |
| |
| return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net); |
| } |
| |
| static int ip6mr_dump(struct net *net, struct notifier_block *nb) |
| { |
| return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump, |
| ip6mr_mr_table_iter, &mrt_lock); |
| } |
| |
| static struct notifier_block ip6_mr_notifier = { |
| .notifier_call = ip6mr_device_event |
| }; |
| |
| static const struct fib_notifier_ops ip6mr_notifier_ops_template = { |
| .family = RTNL_FAMILY_IP6MR, |
| .fib_seq_read = ip6mr_seq_read, |
| .fib_dump = ip6mr_dump, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __net_init ip6mr_notifier_init(struct net *net) |
| { |
| struct fib_notifier_ops *ops; |
| |
| net->ipv6.ipmr_seq = 0; |
| |
| ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net); |
| if (IS_ERR(ops)) |
| return PTR_ERR(ops); |
| |
| net->ipv6.ip6mr_notifier_ops = ops; |
| |
| return 0; |
| } |
| |
| static void __net_exit ip6mr_notifier_exit(struct net *net) |
| { |
| fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops); |
| net->ipv6.ip6mr_notifier_ops = NULL; |
| } |
| |
| /* Setup for IP multicast routing */ |
| static int __net_init ip6mr_net_init(struct net *net) |
| { |
| int err; |
| |
| err = ip6mr_notifier_init(net); |
| if (err) |
| return err; |
| |
| err = ip6mr_rules_init(net); |
| if (err < 0) |
| goto ip6mr_rules_fail; |
| |
| #ifdef CONFIG_PROC_FS |
| err = -ENOMEM; |
| if (!proc_create_net("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_seq_ops, |
| sizeof(struct mr_vif_iter))) |
| goto proc_vif_fail; |
| if (!proc_create_net("ip6_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("ip6_mr_vif", net->proc_net); |
| proc_vif_fail: |
| ip6mr_rules_exit(net); |
| #endif |
| ip6mr_rules_fail: |
| ip6mr_notifier_exit(net); |
| return err; |
| } |
| |
| static void __net_exit ip6mr_net_exit(struct net *net) |
| { |
| #ifdef CONFIG_PROC_FS |
| remove_proc_entry("ip6_mr_cache", net->proc_net); |
| remove_proc_entry("ip6_mr_vif", net->proc_net); |
| #endif |
| ip6mr_rules_exit(net); |
| ip6mr_notifier_exit(net); |
| } |
| |
| static struct pernet_operations ip6mr_net_ops = { |
| .init = ip6mr_net_init, |
| .exit = ip6mr_net_exit, |
| }; |
| |
| int __init ip6_mr_init(void) |
| { |
| int err; |
| |
| mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
| sizeof(struct mfc6_cache), |
| 0, SLAB_HWCACHE_ALIGN, |
| NULL); |
| if (!mrt_cachep) |
| return -ENOMEM; |
| |
| err = register_pernet_subsys(&ip6mr_net_ops); |
| if (err) |
| goto reg_pernet_fail; |
| |
| err = register_netdevice_notifier(&ip6_mr_notifier); |
| if (err) |
| goto reg_notif_fail; |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { |
| pr_err("%s: can't add PIM protocol\n", __func__); |
| err = -EAGAIN; |
| goto add_proto_fail; |
| } |
| #endif |
| err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE, |
| NULL, ip6mr_rtm_dumproute, 0); |
| if (err == 0) |
| return 0; |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| inet6_del_protocol(&pim6_protocol, IPPROTO_PIM); |
| add_proto_fail: |
| unregister_netdevice_notifier(&ip6_mr_notifier); |
| #endif |
| reg_notif_fail: |
| unregister_pernet_subsys(&ip6mr_net_ops); |
| reg_pernet_fail: |
| kmem_cache_destroy(mrt_cachep); |
| return err; |
| } |
| |
| void ip6_mr_cleanup(void) |
| { |
| rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE); |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| inet6_del_protocol(&pim6_protocol, IPPROTO_PIM); |
| #endif |
| unregister_netdevice_notifier(&ip6_mr_notifier); |
| unregister_pernet_subsys(&ip6mr_net_ops); |
| kmem_cache_destroy(mrt_cachep); |
| } |
| |
| static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt, |
| struct mf6cctl *mfc, int mrtsock, int parent) |
| { |
| unsigned char ttls[MAXMIFS]; |
| struct mfc6_cache *uc, *c; |
| struct mr_mfc *_uc; |
| bool found; |
| int i, err; |
| |
| if (mfc->mf6cc_parent >= MAXMIFS) |
| return -ENFILE; |
| |
| memset(ttls, 255, MAXMIFS); |
| for (i = 0; i < MAXMIFS; i++) { |
| if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
| ttls[i] = 1; |
| } |
| |
| /* The entries are added/deleted only under RTNL */ |
| rcu_read_lock(); |
| c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr, |
| &mfc->mf6cc_mcastgrp.sin6_addr, parent); |
| rcu_read_unlock(); |
| if (c) { |
| write_lock_bh(&mrt_lock); |
| c->_c.mfc_parent = mfc->mf6cc_parent; |
| ip6mr_update_thresholds(mrt, &c->_c, ttls); |
| if (!mrtsock) |
| c->_c.mfc_flags |= MFC_STATIC; |
| write_unlock_bh(&mrt_lock); |
| call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, |
| c, mrt->id); |
| mr6_netlink_event(mrt, c, RTM_NEWROUTE); |
| return 0; |
| } |
| |
| if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) && |
| !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) |
| return -EINVAL; |
| |
| c = ip6mr_cache_alloc(); |
| if (!c) |
| return -ENOMEM; |
| |
| c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; |
| c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; |
| c->_c.mfc_parent = mfc->mf6cc_parent; |
| ip6mr_update_thresholds(mrt, &c->_c, ttls); |
| if (!mrtsock) |
| c->_c.mfc_flags |= MFC_STATIC; |
| |
| err = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode, |
| ip6mr_rht_params); |
| if (err) { |
| pr_err("ip6mr: rhtable insert error %d\n", err); |
| ip6mr_cache_free(c); |
| return err; |
| } |
| 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 mfc6_cache *)_uc; |
| if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
| ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
| list_del(&_uc->list); |
| atomic_dec(&mrt->cache_resolve_queue_len); |
| found = true; |
| break; |
| } |
| } |
| if (list_empty(&mrt->mfc_unres_queue)) |
| del_timer(&mrt->ipmr_expire_timer); |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| if (found) { |
| ip6mr_cache_resolve(net, mrt, uc, c); |
| ip6mr_cache_free(uc); |
| } |
| call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, |
| c, mrt->id); |
| mr6_netlink_event(mrt, c, RTM_NEWROUTE); |
| return 0; |
| } |
| |
| /* |
| * Close the multicast socket, and clear the vif tables etc |
| */ |
| |
| static void mroute_clean_tables(struct mr_table *mrt, int flags) |
| { |
| struct mr_mfc *c, *tmp; |
| LIST_HEAD(list); |
| int i; |
| |
| /* Shut down all active vif entries */ |
| if (flags & (MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC)) { |
| for (i = 0; i < mrt->maxvif; i++) { |
| if (((mrt->vif_table[i].flags & VIFF_STATIC) && |
| !(flags & MRT6_FLUSH_MIFS_STATIC)) || |
| (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT6_FLUSH_MIFS))) |
| continue; |
| mif6_delete(mrt, i, 0, &list); |
| } |
| unregister_netdevice_many(&list); |
| } |
| |
| /* Wipe the cache */ |
| if (flags & (MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC)) { |
| list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) { |
| if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC_STATIC)) || |
| (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC))) |
| continue; |
| rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params); |
| list_del_rcu(&c->list); |
| call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net), |
| FIB_EVENT_ENTRY_DEL, |
| (struct mfc6_cache *)c, mrt->id); |
| mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE); |
| mr_cache_put(c); |
| } |
| } |
| |
| if (flags & MRT6_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); |
| mr6_netlink_event(mrt, (struct mfc6_cache *)c, |
| RTM_DELROUTE); |
| ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c); |
| } |
| spin_unlock_bh(&mfc_unres_lock); |
| } |
| } |
| } |
| |
| static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk) |
| { |
| int err = 0; |
| struct net *net = sock_net(sk); |
| |
| rtnl_lock(); |
| write_lock_bh(&mrt_lock); |
| if (rtnl_dereference(mrt->mroute_sk)) { |
| err = -EADDRINUSE; |
| } else { |
| rcu_assign_pointer(mrt->mroute_sk, sk); |
| sock_set_flag(sk, SOCK_RCU_FREE); |
| net->ipv6.devconf_all->mc_forwarding++; |
| } |
| write_unlock_bh(&mrt_lock); |
| |
| if (!err) |
| inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, |
| NETCONFA_MC_FORWARDING, |
| NETCONFA_IFINDEX_ALL, |
| net->ipv6.devconf_all); |
| rtnl_unlock(); |
| |
| return err; |
| } |
| |
| int ip6mr_sk_done(struct sock *sk) |
| { |
| int err = -EACCES; |
| struct net *net = sock_net(sk); |
| struct mr_table *mrt; |
| |
| if (sk->sk_type != SOCK_RAW || |
| inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
| return err; |
| |
| rtnl_lock(); |
| ip6mr_for_each_table(mrt, net) { |
| if (sk == rtnl_dereference(mrt->mroute_sk)) { |
| write_lock_bh(&mrt_lock); |
| RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
| /* Note that mroute_sk had SOCK_RCU_FREE set, |
| * so the RCU grace period before sk freeing |
| * is guaranteed by sk_destruct() |
| */ |
| net->ipv6.devconf_all->mc_forwarding--; |
| write_unlock_bh(&mrt_lock); |
| inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, |
| NETCONFA_MC_FORWARDING, |
| NETCONFA_IFINDEX_ALL, |
| net->ipv6.devconf_all); |
| |
| mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MFC); |
| err = 0; |
| break; |
| } |
| } |
| rtnl_unlock(); |
| |
| return err; |
| } |
| |
| bool mroute6_is_socket(struct net *net, struct sk_buff *skb) |
| { |
| struct mr_table *mrt; |
| struct flowi6 fl6 = { |
| .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
| .flowi6_oif = skb->dev->ifindex, |
| .flowi6_mark = skb->mark, |
| }; |
| |
| if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) |
| return NULL; |
| |
| return rcu_access_pointer(mrt->mroute_sk); |
| } |
| EXPORT_SYMBOL(mroute6_is_socket); |
| |
| /* |
| * Socket options and virtual interface manipulation. The whole |
| * virtual interface system is a complete heap, but unfortunately |
| * that's how BSD mrouted happens to think. Maybe one day with a proper |
| * MOSPF/PIM router set up we can clean this up. |
| */ |
| |
| int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
| { |
| int ret, parent = 0; |
| struct mif6ctl vif; |
| struct mf6cctl mfc; |
| mifi_t mifi; |
| struct net *net = sock_net(sk); |
| struct mr_table *mrt; |
| |
| if (sk->sk_type != SOCK_RAW || |
| inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
| return -EOPNOTSUPP; |
| |
| mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); |
| if (!mrt) |
| return -ENOENT; |
| |
| if (optname != MRT6_INIT) { |
| if (sk != rcu_access_pointer(mrt->mroute_sk) && |
| !ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| return -EACCES; |
| } |
| |
| switch (optname) { |
| case MRT6_INIT: |
| if (optlen < sizeof(int)) |
| return -EINVAL; |
| |
| return ip6mr_sk_init(mrt, sk); |
| |
| case MRT6_DONE: |
| return ip6mr_sk_done(sk); |
| |
| case MRT6_ADD_MIF: |
| if (optlen < sizeof(vif)) |
| return -EINVAL; |
| if (copy_from_user(&vif, optval, sizeof(vif))) |
| return -EFAULT; |
| if (vif.mif6c_mifi >= MAXMIFS) |
| return -ENFILE; |
| rtnl_lock(); |
| ret = mif6_add(net, mrt, &vif, |
| sk == rtnl_dereference(mrt->mroute_sk)); |
| rtnl_unlock(); |
| return ret; |
| |
| case MRT6_DEL_MIF: |
| if (optlen < sizeof(mifi_t)) |
| return -EINVAL; |
| if (copy_from_user(&mifi, optval, sizeof(mifi_t))) |
| return -EFAULT; |
| rtnl_lock(); |
| ret = mif6_delete(mrt, mifi, 0, NULL); |
| rtnl_unlock(); |
| return ret; |
| |
| /* |
| * Manipulate the forwarding caches. These live |
| * in a sort of kernel/user symbiosis. |
| */ |
| case MRT6_ADD_MFC: |
| case MRT6_DEL_MFC: |
| parent = -1; |
| /* fall through */ |
| case MRT6_ADD_MFC_PROXY: |
| case MRT6_DEL_MFC_PROXY: |
| if (optlen < sizeof(mfc)) |
| return -EINVAL; |
| if (copy_from_user(&mfc, optval, sizeof(mfc))) |
| return -EFAULT; |
| if (parent == 0) |
| parent = mfc.mf6cc_parent; |
| rtnl_lock(); |
| if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY) |
| ret = ip6mr_mfc_delete(mrt, &mfc, parent); |
| else |
| ret = ip6mr_mfc_add(net, mrt, &mfc, |
| sk == |
| rtnl_dereference(mrt->mroute_sk), |
| parent); |
| rtnl_unlock(); |
| return ret; |
| |
| case MRT6_FLUSH: |
| { |
| int flags; |
| |
| if (optlen != sizeof(flags)) |
| return -EINVAL; |
| if (get_user(flags, (int __user *)optval)) |
| return -EFAULT; |
| rtnl_lock(); |
| mroute_clean_tables(mrt, flags); |
| rtnl_unlock(); |
| return 0; |
| } |
| |
| /* |
| * Control PIM assert (to activate pim will activate assert) |
| */ |
| case MRT6_ASSERT: |
| { |
| int v; |
| |
| if (optlen != sizeof(v)) |
| return -EINVAL; |
| if (get_user(v, (int __user *)optval)) |
| return -EFAULT; |
| mrt->mroute_do_assert = v; |
| return 0; |
| } |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| case MRT6_PIM: |
| { |
| int v; |
| |
| if (optlen != sizeof(v)) |
| return -EINVAL; |
| if (get_user(v, (int __user *)optval)) |
| return -EFAULT; |
| v = !!v; |
| rtnl_lock(); |
| ret = 0; |
| if (v != mrt->mroute_do_pim) { |
| mrt->mroute_do_pim = v; |
| mrt->mroute_do_assert = v; |
| } |
| rtnl_unlock(); |
| return ret; |
| } |
| |
| #endif |
| #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES |
| case MRT6_TABLE: |
| { |
| u32 v; |
| |
| if (optlen != sizeof(u32)) |
| return -EINVAL; |
| if (get_user(v, (u32 __user *)optval)) |
| return -EFAULT; |
| /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
| if (v != RT_TABLE_DEFAULT && v >= 100000000) |
| return -EINVAL; |
| if (sk == rcu_access_pointer(mrt->mroute_sk)) |
| return -EBUSY; |
| |
| rtnl_lock(); |
| ret = 0; |
| mrt = ip6mr_new_table(net, v); |
| if (IS_ERR(mrt)) |
| ret = PTR_ERR(mrt); |
| else |
| raw6_sk(sk)->ip6mr_table = v; |
| rtnl_unlock(); |
| return ret; |
| } |
| #endif |
| /* |
| * Spurious command, or MRT6_VERSION which you cannot |
| * set. |
| */ |
| default: |
| return -ENOPROTOOPT; |
| } |
| } |
| |
| /* |
| * Getsock opt support for the multicast routing system. |
| */ |
| |
| int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, |
| int __user *optlen) |
| { |
| int olr; |
| int val; |
| struct net *net = sock_net(sk); |
| struct mr_table *mrt; |
| |
| if (sk->sk_type != SOCK_RAW || |
| inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
| return -EOPNOTSUPP; |
| |
| mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); |
| if (!mrt) |
| return -ENOENT; |
| |
| switch (optname) { |
| case MRT6_VERSION: |
| val = 0x0305; |
| break; |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| case MRT6_PIM: |
| val = mrt->mroute_do_pim; |
| break; |
| #endif |
| case MRT6_ASSERT: |
| val = mrt->mroute_do_assert; |
| break; |
| default: |
| return -ENOPROTOOPT; |
| } |
| |
| if (get_user(olr, optlen)) |
| return -EFAULT; |
| |
| olr = min_t(int, olr, sizeof(int)); |
| if (olr < 0) |
| return -EINVAL; |
| |
| if (put_user(olr, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, &val, olr)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /* |
| * The IP multicast ioctl support routines. |
| */ |
| |
| int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) |
| { |
| struct sioc_sg_req6 sr; |
| struct sioc_mif_req6 vr; |
| struct vif_device *vif; |
| struct mfc6_cache *c; |
| struct net *net = sock_net(sk); |
| struct mr_table *mrt; |
| |
| mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); |
| if (!mrt) |
| return -ENOENT; |
| |
| switch (cmd) { |
| case SIOCGETMIFCNT_IN6: |
| if (copy_from_user(&vr, arg, sizeof(vr))) |
| return -EFAULT; |
| if (vr.mifi >= mrt->maxvif) |
| return -EINVAL; |
| vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif); |
| read_lock(&mrt_lock); |
| vif = &mrt->vif_table[vr.mifi]; |
| if (VIF_EXISTS(mrt, vr.mifi)) { |
| vr.icount = vif->pkt_in; |
| vr.ocount = vif->pkt_out; |
| vr.ibytes = vif->bytes_in; |
| vr.obytes = vif->bytes_out; |
| read_unlock(&mrt_lock); |
| |
| if (copy_to_user(arg, &vr, sizeof(vr))) |
| return -EFAULT; |
| return 0; |
| } |
| read_unlock(&mrt_lock); |
| return -EADDRNOTAVAIL; |
| case SIOCGETSGCNT_IN6: |
| if (copy_from_user(&sr, arg, sizeof(sr))) |
| return -EFAULT; |
| |
| rcu_read_lock(); |
| c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_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_req6 { |
| struct sockaddr_in6 src; |
| struct sockaddr_in6 grp; |
| compat_ulong_t pktcnt; |
| compat_ulong_t bytecnt; |
| compat_ulong_t wrong_if; |
| }; |
| |
| struct compat_sioc_mif_req6 { |
| mifi_t mifi; |
| compat_ulong_t icount; |
| compat_ulong_t ocount; |
| compat_ulong_t ibytes; |
| compat_ulong_t obytes; |
| }; |
| |
| int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
| { |
| struct compat_sioc_sg_req6 sr; |
| struct compat_sioc_mif_req6 vr; |
| struct vif_device *vif; |
| struct mfc6_cache *c; |
| struct net *net = sock_net(sk); |
| struct mr_table *mrt; |
| |
| mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); |
| if (!mrt) |
| return -ENOENT; |
| |
| switch (cmd) { |
| case SIOCGETMIFCNT_IN6: |
| if (copy_from_user(&vr, arg, sizeof(vr))) |
| return -EFAULT; |
| if (vr.mifi >= mrt->maxvif) |
| return -EINVAL; |
| vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif); |
| read_lock(&mrt_lock); |
| vif = &mrt->vif_table[vr.mifi]; |
| if (VIF_EXISTS(mrt, vr.mifi)) { |
| vr.icount = vif->pkt_in; |
| vr.ocount = vif->pkt_out; |
| vr.ibytes = vif->bytes_in; |
| vr.obytes = vif->bytes_out; |
| read_unlock(&mrt_lock); |
| |
| if (copy_to_user(arg, &vr, sizeof(vr))) |
| return -EFAULT; |
| return 0; |
| } |
| read_unlock(&mrt_lock); |
| return -EADDRNOTAVAIL; |
| case SIOCGETSGCNT_IN6: |
| if (copy_from_user(&sr, arg, sizeof(sr))) |
| return -EFAULT; |
| |
| rcu_read_lock(); |
| c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_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 inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
| { |
| IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| IPSTATS_MIB_OUTFORWDATAGRAMS); |
| IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| IPSTATS_MIB_OUTOCTETS, skb->len); |
| return dst_output(net, sk, skb); |
| } |
| |
| /* |
| * Processing handlers for ip6mr_forward |
| */ |
| |
| static int ip6mr_forward2(struct net *net, struct mr_table *mrt, |
| struct sk_buff *skb, int vifi) |
| { |
| struct ipv6hdr *ipv6h; |
| struct vif_device *vif = &mrt->vif_table[vifi]; |
| struct net_device *dev; |
| struct dst_entry *dst; |
| struct flowi6 fl6; |
| |
| if (!vif->dev) |
| goto out_free; |
| |
| #ifdef CONFIG_IPV6_PIMSM_V2 |
| if (vif->flags & MIFF_REGISTER) { |
| vif->pkt_out++; |
| vif->bytes_out += skb->len; |
| vif->dev->stats.tx_bytes += skb->len; |
| vif->dev->stats.tx_packets++; |
| ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); |
| goto out_free; |
| } |
| #endif |
| |
| ipv6h = ipv6_hdr(skb); |
| |
| fl6 = (struct flowi6) { |
| .flowi6_oif = vif->link, |
| .daddr = ipv6h->daddr, |
| }; |
| |
| dst = ip6_route_output(net, NULL, &fl6); |
| if (dst->error) { |
| dst_release(dst); |
| goto out_free; |
| } |
| |
| skb_dst_drop(skb); |
| skb_dst_set(skb, dst); |
| |
| /* |
| * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
| * not only before forwarding, but after forwarding on all output |
| * interfaces. It is clear, if mrouter runs a multicasting |
| * program, it should receive packets not depending to what interface |
| * program is joined. |
| * If we will not make it, the program will have to join on all |
| * interfaces. On the other hand, multihoming host (or router, but |
| * not mrouter) cannot join to more than one interface - it will |
| * result in receiving multiple packets. |
| */ |
| dev = vif->dev; |
| skb->dev = dev; |
| vif->pkt_out++; |
| vif->bytes_out += skb->len; |
| |
| /* We are about to write */ |
| /* XXX: extension headers? */ |
| if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) |
| goto out_free; |
| |
| ipv6h = ipv6_hdr(skb); |
| ipv6h->hop_limit--; |
| |
| IP6CB(skb)->flags |= IP6SKB_FORWARDED; |
| |
| return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, |
| net, NULL, skb, skb->dev, dev, |
| ip6mr_forward2_finish); |
| |
| out_free: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static int ip6mr_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; |
| } |
| |
| static void ip6_mr_forward(struct net *net, struct mr_table *mrt, |
| struct net_device *dev, struct sk_buff *skb, |
| struct mfc6_cache *c) |
| { |
| int psend = -1; |
| int vif, ct; |
| int true_vifi = ip6mr_find_vif(mrt, dev); |
| |
| 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 (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) { |
| struct mfc6_cache *cache_proxy; |
| |
| /* For an (*,G) entry, we only check that the incoming |
| * interface is part of the static tree. |
| */ |
| rcu_read_lock(); |
| cache_proxy = mr_mfc_find_any_parent(mrt, vif); |
| if (cache_proxy && |
| cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) { |
| rcu_read_unlock(); |
| goto forward; |
| } |
| rcu_read_unlock(); |
| } |
| |
| /* |
| * Wrong interface: drop packet and (maybe) send PIM assert. |
| */ |
| if (mrt->vif_table[vif].dev != dev) { |
| 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; |
| ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); |
| } |
| goto dont_forward; |
| } |
| |
| forward: |
| mrt->vif_table[vif].pkt_in++; |
| mrt->vif_table[vif].bytes_in += skb->len; |
| |
| /* |
| * Forward the frame |
| */ |
| if (ipv6_addr_any(&c->mf6c_origin) && |
| ipv6_addr_any(&c->mf6c_mcastgrp)) { |
| if (true_vifi >= 0 && |
| true_vifi != c->_c.mfc_parent && |
| ipv6_hdr(skb)->hop_limit > |
| 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 ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) && |
| ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) { |
| if (psend != -1) { |
| struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (skb2) |
| ip6mr_forward2(net, mrt, skb2, psend); |
| } |
| psend = ct; |
| } |
| } |
| last_forward: |
| if (psend != -1) { |
| ip6mr_forward2(net, mrt, skb, psend); |
| return; |
| } |
| |
| dont_forward: |
| kfree_skb(skb); |
| } |
| |
| |
| /* |
| * Multicast packets for forwarding arrive here |
| */ |
| |
| int ip6_mr_input(struct sk_buff *skb) |
| { |
| struct mfc6_cache *cache; |
| struct net *net = dev_net(skb->dev); |
| struct mr_table *mrt; |
| struct flowi6 fl6 = { |
| .flowi6_iif = skb->dev->ifindex, |
| .flowi6_mark = skb->mark, |
| }; |
| int err; |
| struct net_device *dev; |
| |
| /* skb->dev passed in is the master dev for vrfs. |
| * 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; |
| } |
| } |
| |
| err = ip6mr_fib_lookup(net, &fl6, &mrt); |
| if (err < 0) { |
| kfree_skb(skb); |
| return err; |
| } |
| |
| read_lock(&mrt_lock); |
| cache = ip6mr_cache_find(mrt, |
| &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); |
| if (!cache) { |
| int vif = ip6mr_find_vif(mrt, dev); |
| |
| if (vif >= 0) |
| cache = ip6mr_cache_find_any(mrt, |
| &ipv6_hdr(skb)->daddr, |
| vif); |
| } |
| |
| /* |
| * No usable cache entry |
| */ |
| if (!cache) { |
| int vif; |
| |
| vif = ip6mr_find_vif(mrt, dev); |
| if (vif >= 0) { |
| int err = ip6mr_cache_unresolved(mrt, vif, skb, dev); |
| read_unlock(&mrt_lock); |
| |
| return err; |
| } |
| read_unlock(&mrt_lock); |
| kfree_skb(skb); |
| return -ENODEV; |
| } |
| |
| ip6_mr_forward(net, mrt, dev, skb, cache); |
| |
| read_unlock(&mrt_lock); |
| |
| return 0; |
| } |
| |
| int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm, |
| u32 portid) |
| { |
| int err; |
| struct mr_table *mrt; |
| struct mfc6_cache *cache; |
| struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
| |
| mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
| if (!mrt) |
| return -ENOENT; |
| |
| read_lock(&mrt_lock); |
| cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
| if (!cache && skb->dev) { |
| int vif = ip6mr_find_vif(mrt, skb->dev); |
| |
| if (vif >= 0) |
| cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr, |
| vif); |
| } |
| |
| if (!cache) { |
| struct sk_buff *skb2; |
| struct ipv6hdr *iph; |
| struct net_device *dev; |
| int vif; |
| |
| dev = skb->dev; |
| if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) { |
| read_unlock(&mrt_lock); |
| return -ENODEV; |
| } |
| |
| /* really correct? */ |
| skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| if (!skb2) { |
| read_unlock(&mrt_lock); |
| return -ENOMEM; |
| } |
| |
| NETLINK_CB(skb2).portid = portid; |
| skb_reset_transport_header(skb2); |
| |
| skb_put(skb2, sizeof(struct ipv6hdr)); |
| skb_reset_network_header(skb2); |
| |
| iph = ipv6_hdr(skb2); |
| iph->version = 0; |
| iph->priority = 0; |
| iph->flow_lbl[0] = 0; |
| iph->flow_lbl[1] = 0; |
| iph->flow_lbl[2] = 0; |
| iph->payload_len = 0; |
| iph->nexthdr = IPPROTO_NONE; |
| iph->hop_limit = 0; |
| iph->saddr = rt->rt6i_src.addr; |
| iph->daddr = rt->rt6i_dst.addr; |
| |
| err = ip6mr_cache_unresolved(mrt, vif, skb2, dev); |
| read_unlock(&mrt_lock); |
| |
| return err; |
| } |
| |
| err = mr_fill_mroute(mrt, skb, &cache->_c, rtm); |
| read_unlock(&mrt_lock); |
| return err; |
| } |
| |
| static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
| u32 portid, u32 seq, struct mfc6_cache *c, int cmd, |
| int flags) |
| { |
| struct nlmsghdr *nlh; |
| struct rtmsg *rtm; |
| int err; |
| |
| nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| rtm = nlmsg_data(nlh); |
| rtm->rtm_family = RTNL_FAMILY_IP6MR; |
| rtm->rtm_dst_len = 128; |
| rtm->rtm_src_len = 128; |
| rtm->rtm_tos = 0; |
| rtm->rtm_table = mrt->id; |
| if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
| goto nla_put_failure; |
| rtm->rtm_type = RTN_MULTICAST; |
| rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
| if (c->_c.mfc_flags & MFC_STATIC) |
| rtm->rtm_protocol = RTPROT_STATIC; |
| else |
| rtm->rtm_protocol = RTPROT_MROUTED; |
| rtm->rtm_flags = 0; |
| |
| if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) || |
| nla_put_in6_addr(skb, RTA_DST, &c->mf6c_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 _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
| u32 portid, u32 seq, struct mr_mfc *c, |
| int cmd, int flags) |
| { |
| return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c, |
| cmd, flags); |
| } |
| |
| static int mr6_msgsize(bool unresolved, int maxvif) |
| { |
| size_t len = |
| NLMSG_ALIGN(sizeof(struct rtmsg)) |
| + nla_total_size(4) /* RTA_TABLE */ |
| + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */ |
| + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */ |
| ; |
| |
| if (!unresolved) |
| len = len |
| + nla_total_size(4) /* RTA_IIF */ |
| + nla_total_size(0) /* RTA_MULTIPATH */ |
| + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) |
| /* RTA_MFC_STATS */ |
| + nla_total_size_64bit(sizeof(struct rta_mfc_stats)) |
| ; |
| |
| return len; |
| } |
| |
| static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc, |
| int cmd) |
| { |
| struct net *net = read_pnet(&mrt->net); |
| struct sk_buff *skb; |
| int err = -ENOBUFS; |
| |
| skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif), |
| GFP_ATOMIC); |
| if (!skb) |
| goto errout; |
| |
| err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
| if (err < 0) |
| goto errout; |
| |
| rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC); |
| return; |
| |
| errout: |
| kfree_skb(skb); |
| if (err < 0) |
| rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err); |
| } |
| |
| static size_t mrt6msg_netlink_msgsize(size_t payloadlen) |
| { |
| size_t len = |
| NLMSG_ALIGN(sizeof(struct rtgenmsg)) |
| + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */ |
| + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */ |
| /* IP6MRA_CREPORT_SRC_ADDR */ |
| + nla_total_size(sizeof(struct in6_addr)) |
| /* IP6MRA_CREPORT_DST_ADDR */ |
| + nla_total_size(sizeof(struct in6_addr)) |
| /* IP6MRA_CREPORT_PKT */ |
| + nla_total_size(payloadlen) |
| ; |
| |
| return len; |
| } |
| |
| static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt) |
| { |
| struct net *net = read_pnet(&mrt->net); |
| struct nlmsghdr *nlh; |
| struct rtgenmsg *rtgenm; |
| struct mrt6msg *msg; |
| struct sk_buff *skb; |
| struct nlattr *nla; |
| int payloadlen; |
| |
| payloadlen = pkt->len - sizeof(struct mrt6msg); |
| msg = (struct mrt6msg *)skb_transport_header(pkt); |
| |
| skb = nlmsg_new(mrt6msg_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_IP6MR; |
| if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) || |
| nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) || |
| nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR, |
| &msg->im6_src) || |
| nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR, |
| &msg->im6_dst)) |
| goto nla_put_failure; |
| |
| nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen); |
| if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg), |
| nla_data(nla), payloadlen)) |
| goto nla_put_failure; |
| |
| nlmsg_end(skb, nlh); |
| |
| rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC); |
| return; |
| |
| nla_put_failure: |
| nlmsg_cancel(skb, nlh); |
| errout: |
| kfree_skb(skb); |
| rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS); |
| } |
| |
| static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| const struct nlmsghdr *nlh = cb->nlh; |
| struct fib_dump_filter filter = {}; |
| int err; |
| |
| if (cb->strict_check) { |
| err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh, |
| &filter, cb); |
| if (err < 0) |
| return err; |
| } |
| |
| if (filter.table_id) { |
| struct mr_table *mrt; |
| |
| mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id); |
| if (!mrt) { |
| if (filter.dump_all_families) |
| return skb->len; |
| |
| NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist"); |
| return -ENOENT; |
| } |
| err = mr_table_dump(mrt, skb, cb, _ip6mr_fill_mroute, |
| &mfc_unres_lock, &filter); |
| return skb->len ? : err; |
| } |
| |
| return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter, |
| _ip6mr_fill_mroute, &mfc_unres_lock, &filter); |
| } |