| /* |
| * 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 |
| * |
| * 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. |
| * |
| * 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/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/nexthop.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_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 __ro_after_init; |
| |
| static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
| static void ipmr_free_table(struct mr_table *mrt); |
| |
| 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(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(struct mr_table *mrt, struct sk_buff *pkt); |
| static void mroute_clean_tables(struct mr_table *mrt, int flags); |
| 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) |
| |
| 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 const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { |
| FRA_GENERIC_POLICY, |
| }; |
| |
| 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, |
| .policy = ipmr_rule_policy, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __net_init ipmr_rules_init(struct net *net) |
| { |
| struct fib_rules_ops *ops; |
| 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, 0); |
| if (err < 0) |
| goto err2; |
| |
| net->ipv4.mr_rules_ops = ops; |
| return 0; |
| |
| err2: |
| ipmr_free_table(mrt); |
| err1: |
| fib_rules_unregister(ops); |
| return err; |
| } |
| |
| static void __net_exit ipmr_rules_exit(struct net *net) |
| { |
| struct mr_table *mrt, *next; |
| |
| rtnl_lock(); |
| list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
| list_del(&mrt->list); |
| ipmr_free_table(mrt); |
| } |
| fib_rules_unregister(net->ipv4.mr_rules_ops); |
| rtnl_unlock(); |
| } |
| |
| static int ipmr_rules_dump(struct net *net, struct notifier_block *nb) |
| { |
| return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR); |
| } |
| |
| static unsigned int ipmr_rules_seq_read(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 |
| #define ipmr_for_each_table(mrt, net) \ |
| for (mrt = net->ipv4.mrt; mrt; mrt = NULL) |
| |
| static struct mr_table *ipmr_mr_table_iter(struct net *net, |
| struct mr_table *mrt) |
| { |
| if (!mrt) |
| return net->ipv4.mrt; |
| return NULL; |
| } |
| |
| static struct mr_table *ipmr_get_table(struct net *net, u32 id) |
| { |
| return net->ipv4.mrt; |
| } |
| |
| static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
| struct mr_table **mrt) |
| { |
| *mrt = net->ipv4.mrt; |
| 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); |
| net->ipv4.mrt = mrt; |
| return 0; |
| } |
| |
| static void __net_exit ipmr_rules_exit(struct net *net) |
| { |
| rtnl_lock(); |
| ipmr_free_table(net->ipv4.mrt); |
| net->ipv4.mrt = NULL; |
| rtnl_unlock(); |
| } |
| |
| static int ipmr_rules_dump(struct net *net, struct notifier_block *nb) |
| { |
| return 0; |
| } |
| |
| static unsigned int ipmr_rules_seq_read(struct net *net) |
| { |
| return 0; |
| } |
| |
| bool ipmr_rule_default(const struct fib_rule *rule) |
| { |
| return true; |
| } |
| EXPORT_SYMBOL(ipmr_rule_default); |
| #endif |
| |
| static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg, |
| const void *ptr) |
| { |
| const struct mfc_cache_cmp_arg *cmparg = arg->key; |
| struct mfc_cache *c = (struct mfc_cache *)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, |
| .locks_mul = 1, |
| .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) |
| { |
| del_timer_sync(&mrt->ipmr_expire_timer); |
| mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC | |
| MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC); |
| rhltable_destroy(&mrt->mfc_hash); |
| kfree(mrt); |
| } |
| |
| /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
| |
| static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
| { |
| struct net *net = dev_net(dev); |
| |
| dev_close(dev); |
| |
| dev = __dev_get_by_name(net, "tunl0"); |
| if (dev) { |
| const struct net_device_ops *ops = dev->netdev_ops; |
| struct ifreq ifr; |
| struct ip_tunnel_parm p; |
| |
| memset(&p, 0, sizeof(p)); |
| 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); |
| ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
| |
| if (ops->ndo_do_ioctl) { |
| mm_segment_t oldfs = get_fs(); |
| |
| set_fs(KERNEL_DS); |
| ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); |
| set_fs(oldfs); |
| } |
| } |
| } |
| |
| /* 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 *dev; |
| |
| dev = __dev_get_by_name(net, "tunl0"); |
| |
| if (dev) { |
| const struct net_device_ops *ops = dev->netdev_ops; |
| int err; |
| struct ifreq ifr; |
| struct ip_tunnel_parm p; |
| |
| memset(&p, 0, sizeof(p)); |
| 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); |
| ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
| |
| if (ops->ndo_do_ioctl) { |
| mm_segment_t oldfs = get_fs(); |
| |
| set_fs(KERNEL_DS); |
| err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); |
| set_fs(oldfs); |
| } else { |
| err = -EOPNOTSUPP; |
| } |
| dev = NULL; |
| |
| if (err == 0 && |
| (dev = __dev_get_by_name(net, p.name)) != NULL) { |
| dev->flags |= IFF_MULTICAST; |
| 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; |
| } |
| |
| #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 |
| * @notify: Set to 1, if the caller is a notifier_call |
| */ |
| static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
| struct list_head *head) |
| { |
| struct 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 (!dev) |
| return -ENOBUFS; |
| err = dev_set_allmulti(dev, 1); |
| if (err) { |
| ipmr_del_tunnel(dev, vifc); |
| dev_put(dev); |
| return err; |
| } |
| break; |
| case VIFF_USE_IFINDEX: |
| case 0: |
| if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
| dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); |
| if (dev && !__in_dev_get_rtnl(dev)) { |
| 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; |
| else |
| msg->im_vif = mrt->mroute_reg_vif_num; |
| ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
| ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + |
| sizeof(struct iphdr)); |
| } else { |
| /* 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; |
| 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 */ |
| if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
| (c = ipmr_cache_alloc_unres()) == NULL) { |
| spin_unlock_bh(&mfc_unres_lock); |
| |
| kfree_skb(skb); |
| return -ENOBUFS; |
| } |
| |
| /* Fill in the new cache entry */ |
| c->_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 dont need to call synchronize_rcu() here |
| */ |
| static void mrtsock_destruct(struct sock *sk) |
| { |
| struct net *net = sock_net(sk); |
| struct mr_table *mrt; |
| |
| rtnl_lock(); |
| ipmr_for_each_table(mrt, net) { |
| if (sk == rtnl_dereference(mrt->mroute_sk)) { |
| IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
| 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, char __user *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_user(&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; |
| /* fall through */ |
| case MRT_ADD_MFC_PROXY: |
| case MRT_DEL_MFC_PROXY: |
| if (optlen != sizeof(mfc)) { |
| ret = -EINVAL; |
| break; |
| } |
| if (copy_from_user(&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 (get_user(val, (int __user *)optval)) { |
| ret = -EFAULT; |
| break; |
| } |
| mroute_clean_tables(mrt, val); |
| break; |
| /* Control PIM assert. */ |
| case MRT_ASSERT: |
| if (optlen != sizeof(val)) { |
| ret = -EINVAL; |
| break; |
| } |
| if (get_user(val, (int __user *)optval)) { |
| 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 (get_user(val, (int __user *)optval)) { |
| 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 (get_user(uval, (u32 __user *)optval)) { |
| 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(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 incomming |
| * 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(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_clone(skb, GFP_ATOMIC); |
| 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 */ |
| /* 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) || |
| 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)) |
| 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(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_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 (filter.dump_all_families) |
| 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(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(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(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(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 |