--- /dev/null
+/*
+ * 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 <asm/uaccess.h>
+#include <linux/types.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/timer.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/sock.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 <net/ip_tunnels.h>
+#include <net/checksum.h>
+#include <net/netlink.h>
+#include <net/fib_rules.h>
+#include <linux/netconf.h>
+
+#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
+#define CONFIG_IP_PIMSM 1
+#endif
+
+struct mr_table {
+ struct list_head list;
+ possible_net_t net;
+ u32 id;
+ struct sock __rcu *mroute_sk;
+ struct timer_list ipmr_expire_timer;
+ struct list_head mfc_unres_queue;
+ struct list_head mfc_cache_array[MFC_LINES];
+ struct vif_device vif_table[MAXVIFS];
+ int maxvif;
+ atomic_t cache_resolve_queue_len;
+ bool mroute_do_assert;
+ bool mroute_do_pim;
+#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
+ int mroute_reg_vif_num;
+#endif
+};
+
+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
+ */
+
+#define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL)
+
+/* 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 *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 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 int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
+ struct mfc_cache *c, struct rtmsg *rtm);
+static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
+ int cmd);
+static void mroute_clean_tables(struct mr_table *mrt);
+static void ipmr_expire_process(unsigned long arg);
+
+#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_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,
+ };
+
+ 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;
+ }
+
+ mrt = ipmr_get_table(rule->fr_net, rule->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)
+{
+ 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,
+ .default_pref = fib_default_rule_pref,
+ .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 (!mrt) {
+ err = -ENOMEM;
+ 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();
+}
+#else
+#define ipmr_for_each_table(mrt, net) \
+ for (mrt = net->ipv4.mrt; mrt; mrt = 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)
+{
+ net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
+ return net->ipv4.mrt ? 0 : -ENOMEM;
+}
+
+static void __net_exit ipmr_rules_exit(struct net *net)
+{
+ rtnl_lock();
+ ipmr_free_table(net->ipv4.mrt);
+ net->ipv4.mrt = NULL;
+ rtnl_unlock();
+}
+#endif
+
+static struct mr_table *ipmr_new_table(struct net *net, u32 id)
+{
+ struct mr_table *mrt;
+ unsigned int i;
+
+ mrt = ipmr_get_table(net, id);
+ if (mrt)
+ return mrt;
+
+ mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
+ if (!mrt)
+ return NULL;
+ write_pnet(&mrt->net, net);
+ mrt->id = id;
+
+ /* Forwarding cache */
+ for (i = 0; i < MFC_LINES; i++)
+ INIT_LIST_HEAD(&mrt->mfc_cache_array[i]);
+
+ INIT_LIST_HEAD(&mrt->mfc_unres_queue);
+
+ setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
+ (unsigned long)mrt);
+
+#ifdef CONFIG_IP_PIMSM
+ mrt->mroute_reg_vif_num = -1;
+#endif
+#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
+ list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
+#endif
+ return mrt;
+}
+
+static void ipmr_free_table(struct mr_table *mrt)
+{
+ del_timer_sync(&mrt->ipmr_expire_timer);
+ mroute_clean_tables(mrt);
+ 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);
+ }
+ }
+}
+
+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;
+ struct in_device *in_dev;
+
+ 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;
+
+ in_dev = __in_dev_get_rtnl(dev);
+ if (!in_dev)
+ goto failure;
+
+ ipv4_devconf_setall(in_dev);
+ neigh_parms_data_state_setall(in_dev->arp_parms);
+ IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
+
+ if (dev_open(dev))
+ goto failure;
+ dev_hold(dev);
+ }
+ }
+ return dev;
+
+failure:
+ /* allow the register to be completed before unregistering. */
+ rtnl_unlock();
+ rtnl_lock();
+
+ unregister_netdevice(dev);
+ return NULL;
+}
+
+#ifdef CONFIG_IP_PIMSM
+
+static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct net *net = dev_net(dev);
+ struct mr_table *mrt;
+ struct flowi4 fl4 = {
+ .flowi4_oif = dev->ifindex,
+ .flowi4_iif = skb->skb_iif ? : 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->destructor = free_netdev;
+ dev->features |= NETIF_F_NETNS_LOCAL;
+}
+
+static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
+{
+ struct net_device *dev;
+ struct in_device *in_dev;
+ char name[IFNAMSIZ];
+
+ if (mrt->id == RT_TABLE_DEFAULT)
+ sprintf(name, "pimreg");
+ else
+ sprintf(name, "pimreg%u", mrt->id);
+
+ dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
+
+ if (!dev)
+ return NULL;
+
+ dev_net_set(dev, net);
+
+ if (register_netdevice(dev)) {
+ free_netdev(dev);
+ return NULL;
+ }
+
+ rcu_read_lock();
+ in_dev = __in_dev_get_rcu(dev);
+ if (!in_dev) {
+ rcu_read_unlock();
+ goto failure;
+ }
+
+ ipv4_devconf_setall(in_dev);
+ neigh_parms_data_state_setall(in_dev->arp_parms);
+ IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
+ rcu_read_unlock();
+
+ if (dev_open(dev))
+ goto failure;
+
+ dev_hold(dev);
+
+ return dev;
+
+failure:
+ /* allow the register to be completed before unregistering. */
+ rtnl_unlock();
+ rtnl_lock();
+
+ unregister_netdevice(dev);
+ return NULL;
+}
+#endif
+
+/**
+ * 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 vif_device *v;
+ struct net_device *dev;
+ struct in_device *in_dev;
+
+ if (vifi < 0 || vifi >= mrt->maxvif)
+ return -EADDRNOTAVAIL;
+
+ v = &mrt->vif_table[vifi];
+
+ write_lock_bh(&mrt_lock);
+ dev = v->dev;
+ v->dev = NULL;
+
+ if (!dev) {
+ write_unlock_bh(&mrt_lock);
+ return -EADDRNOTAVAIL;
+ }
+
+#ifdef CONFIG_IP_PIMSM
+ if (vifi == mrt->mroute_reg_vif_num)
+ mrt->mroute_reg_vif_num = -1;
+#endif
+
+ if (vifi + 1 == mrt->maxvif) {
+ int tmp;
+
+ for (tmp = vifi - 1; tmp >= 0; tmp--) {
+ if (VIF_EXISTS(mrt, tmp))
+ break;
+ }
+ mrt->maxvif = tmp+1;
+ }
+
+ write_unlock_bh(&mrt_lock);
+
+ dev_set_allmulti(dev, -1);
+
+ in_dev = __in_dev_get_rtnl(dev);
+ if (in_dev) {
+ IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
+ inet_netconf_notify_devconf(dev_net(dev),
+ 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 mfc_cache *c = container_of(head, struct mfc_cache, rcu);
+
+ kmem_cache_free(mrt_cachep, c);
+}
+
+static inline void ipmr_cache_free(struct mfc_cache *c)
+{
+ call_rcu(&c->rcu, ipmr_cache_free_rcu);
+}
+
+/* Destroy an unresolved cache entry, killing queued skbs
+ * and reporting error to netlink readers.
+ */
+
+static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
+{
+ struct net *net = read_pnet(&mrt->net);
+ struct sk_buff *skb;
+ struct nlmsgerr *e;
+
+ atomic_dec(&mrt->cache_resolve_queue_len);
+
+ while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
+ if (ip_hdr(skb)->version == 0) {
+ struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
+ nlh->nlmsg_type = NLMSG_ERROR;
+ nlh->nlmsg_len = nlmsg_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(unsigned long arg)
+{
+ struct mr_table *mrt = (struct mr_table *)arg;
+ unsigned long now;
+ unsigned long expires;
+ struct mfc_cache *c, *next;
+
+ if (!spin_trylock(&mfc_unres_lock)) {
+ mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
+ return;
+ }
+
+ if (list_empty(&mrt->mfc_unres_queue))
+ goto out;
+
+ now = jiffies;
+ expires = 10*HZ;
+
+ list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
+ if (time_after(c->mfc_un.unres.expires, now)) {
+ unsigned long interval = c->mfc_un.unres.expires - now;
+ if (interval < expires)
+ expires = interval;
+ continue;
+ }
+
+ list_del(&c->list);
+ mroute_netlink_event(mrt, c, RTM_DELROUTE);
+ ipmr_destroy_unres(mrt, c);
+ }
+
+ if (!list_empty(&mrt->mfc_unres_queue))
+ mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
+
+out:
+ spin_unlock(&mfc_unres_lock);
+}
+
+/* Fill oifs list. It is called under write locked mrt_lock. */
+
+static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache,
+ unsigned char *ttls)
+{
+ int vifi;
+
+ cache->mfc_un.res.minvif = MAXVIFS;
+ cache->mfc_un.res.maxvif = 0;
+ memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
+
+ for (vifi = 0; vifi < mrt->maxvif; vifi++) {
+ if (VIF_EXISTS(mrt, vifi) &&
+ ttls[vifi] && ttls[vifi] < 255) {
+ cache->mfc_un.res.ttls[vifi] = ttls[vifi];
+ if (cache->mfc_un.res.minvif > vifi)
+ cache->mfc_un.res.minvif = vifi;
+ if (cache->mfc_un.res.maxvif <= vifi)
+ cache->mfc_un.res.maxvif = vifi + 1;
+ }
+ }
+}
+
+static int vif_add(struct net *net, struct mr_table *mrt,
+ struct vifctl *vifc, int mrtsock)
+{
+ int vifi = vifc->vifc_vifi;
+ struct vif_device *v = &mrt->vif_table[vifi];
+ struct net_device *dev;
+ struct in_device *in_dev;
+ int err;
+
+ /* Is vif busy ? */
+ if (VIF_EXISTS(mrt, vifi))
+ return -EADDRINUSE;
+
+ switch (vifc->vifc_flags) {
+#ifdef CONFIG_IP_PIMSM
+ case VIFF_REGISTER:
+ /*
+ * Special Purpose VIF in PIM
+ * All the packets will be sent to the daemon
+ */
+ if (mrt->mroute_reg_vif_num >= 0)
+ return -EADDRINUSE;
+ dev = ipmr_reg_vif(net, mrt);
+ if (!dev)
+ return -ENOBUFS;
+ err = dev_set_allmulti(dev, 1);
+ if (err) {
+ unregister_netdevice(dev);
+ dev_put(dev);
+ return err;
+ }
+ break;
+#endif
+ case VIFF_TUNNEL:
+ dev = ipmr_new_tunnel(net, vifc);
+ if (!dev)
+ return -ENOBUFS;
+ err = dev_set_allmulti(dev, 1);
+ if (err) {
+ ipmr_del_tunnel(dev, vifc);
+ dev_put(dev);
+ return err;
+ }
+ break;
+
+ case VIFF_USE_IFINDEX:
+ case 0:
+ if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
+ dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
+ if (dev && !__in_dev_get_rtnl(dev)) {
+ 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, NETCONFA_MC_FORWARDING, dev->ifindex,
+ &in_dev->cnf);
+ ip_rt_multicast_event(in_dev);
+
+ /* Fill in the VIF structures */
+
+ v->rate_limit = vifc->vifc_rate_limit;
+ v->local = vifc->vifc_lcl_addr.s_addr;
+ v->remote = vifc->vifc_rmt_addr.s_addr;
+ v->flags = vifc->vifc_flags;
+ if (!mrtsock)
+ v->flags |= VIFF_STATIC;
+ v->threshold = vifc->vifc_threshold;
+ v->bytes_in = 0;
+ v->bytes_out = 0;
+ v->pkt_in = 0;
+ v->pkt_out = 0;
+ v->link = dev->ifindex;
+ if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER))
+ v->link = dev_get_iflink(dev);
+
+ /* And finish update writing critical data */
+ write_lock_bh(&mrt_lock);
+ v->dev = dev;
+#ifdef CONFIG_IP_PIMSM
+ if (v->flags & VIFF_REGISTER)
+ mrt->mroute_reg_vif_num = vifi;
+#endif
+ if (vifi+1 > mrt->maxvif)
+ mrt->maxvif = vifi+1;
+ write_unlock_bh(&mrt_lock);
+ return 0;
+}
+
+/* called with rcu_read_lock() */
+static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
+ __be32 origin,
+ __be32 mcastgrp)
+{
+ int line = MFC_HASH(mcastgrp, origin);
+ struct mfc_cache *c;
+
+ list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) {
+ if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp)
+ return c;
+ }
+ return NULL;
+}
+
+/* Look for a (*,*,oif) entry */
+static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt,
+ int vifi)
+{
+ int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY));
+ struct mfc_cache *c;
+
+ list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
+ if (c->mfc_origin == htonl(INADDR_ANY) &&
+ c->mfc_mcastgrp == htonl(INADDR_ANY) &&
+ c->mfc_un.res.ttls[vifi] < 255)
+ return c;
+
+ return NULL;
+}
+
+/* Look for a (*,G) entry */
+static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
+ __be32 mcastgrp, int vifi)
+{
+ int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY));
+ struct mfc_cache *c, *proxy;
+
+ if (mcastgrp == htonl(INADDR_ANY))
+ goto skip;
+
+ list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
+ if (c->mfc_origin == htonl(INADDR_ANY) &&
+ c->mfc_mcastgrp == mcastgrp) {
+ if (c->mfc_un.res.ttls[vifi] < 255)
+ return c;
+
+ /* It's ok if the vifi is part of the static tree */
+ proxy = ipmr_cache_find_any_parent(mrt,
+ c->mfc_parent);
+ if (proxy && proxy->mfc_un.res.ttls[vifi] < 255)
+ return c;
+ }
+
+skip:
+ return ipmr_cache_find_any_parent(mrt, vifi);
+}
+
+/*
+ * Allocate a multicast cache entry
+ */
+static struct mfc_cache *ipmr_cache_alloc(void)
+{
+ struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
+
+ if (c)
+ c->mfc_un.res.minvif = MAXVIFS;
+ return c;
+}
+
+static struct mfc_cache *ipmr_cache_alloc_unres(void)
+{
+ struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
+
+ if (c) {
+ skb_queue_head_init(&c->mfc_un.unres.unresolved);
+ c->mfc_un.unres.expires = jiffies + 10*HZ;
+ }
+ return c;
+}
+
+/*
+ * A cache entry has gone into a resolved state from queued
+ */
+
+static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
+ struct mfc_cache *uc, struct mfc_cache *c)
+{
+ struct sk_buff *skb;
+ struct nlmsgerr *e;
+
+ /* Play the pending entries through our router */
+
+ while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
+ if (ip_hdr(skb)->version == 0) {
+ struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
+
+ if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
+ nlh->nlmsg_len = skb_tail_pointer(skb) -
+ (u8 *)nlh;
+ } else {
+ nlh->nlmsg_type = NLMSG_ERROR;
+ nlh->nlmsg_len = nlmsg_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, c, 0);
+ }
+ }
+}
+
+/*
+ * Bounce a cache query up to mrouted. We could use netlink for this but mrouted
+ * expects the following bizarre scheme.
+ *
+ * Called under mrt_lock.
+ */
+
+static int ipmr_cache_report(struct mr_table *mrt,
+ struct sk_buff *pkt, vifi_t vifi, int assert)
+{
+ struct sk_buff *skb;
+ const int ihl = ip_hdrlen(pkt);
+ struct igmphdr *igmp;
+ struct igmpmsg *msg;
+ struct sock *mroute_sk;
+ int ret;
+
+#ifdef CONFIG_IP_PIMSM
+ if (assert == IGMPMSG_WHOLEPKT)
+ skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
+ else
+#endif
+ skb = alloc_skb(128, GFP_ATOMIC);
+
+ if (!skb)
+ return -ENOBUFS;
+
+#ifdef CONFIG_IP_PIMSM
+ if (assert == IGMPMSG_WHOLEPKT) {
+ /* Ugly, but we have no choice with this interface.
+ * Duplicate old header, fix ihl, length etc.
+ * And all this only to mangle msg->im_msgtype and
+ * to set msg->im_mbz to "mbz" :-)
+ */
+ skb_push(skb, sizeof(struct iphdr));
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+ msg = (struct igmpmsg *)skb_network_header(skb);
+ memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
+ msg->im_msgtype = IGMPMSG_WHOLEPKT;
+ msg->im_mbz = 0;
+ msg->im_vif = mrt->mroute_reg_vif_num;
+ ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
+ ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
+ sizeof(struct iphdr));
+ } else
+#endif
+ {
+
+ /* Copy the IP header */
+
+ skb_set_network_header(skb, skb->len);
+ skb_put(skb, ihl);
+ skb_copy_to_linear_data(skb, pkt->data, ihl);
+ ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */
+ msg = (struct igmpmsg *)skb_network_header(skb);
+ msg->im_vif = vifi;
+ skb_dst_set(skb, dst_clone(skb_dst(pkt)));
+
+ /* Add our header */
+
+ igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
+ igmp->type =
+ msg->im_msgtype = assert;
+ igmp->code = 0;
+ ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
+ skb->transport_header = skb->network_header;
+ }
+
+ rcu_read_lock();
+ mroute_sk = rcu_dereference(mrt->mroute_sk);
+ if (!mroute_sk) {
+ rcu_read_unlock();
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+
+ /* Deliver to mrouted */
+
+ ret = sock_queue_rcv_skb(mroute_sk, skb);
+ rcu_read_unlock();
+ if (ret < 0) {
+ 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)
+{
+ bool found = false;
+ int err;
+ struct mfc_cache *c;
+ const struct iphdr *iph = ip_hdr(skb);
+
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry(c, &mrt->mfc_unres_queue, list) {
+ if (c->mfc_mcastgrp == iph->daddr &&
+ c->mfc_origin == iph->saddr) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ /* Create a new entry if allowable */
+
+ if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
+ (c = ipmr_cache_alloc_unres()) == NULL) {
+ spin_unlock_bh(&mfc_unres_lock);
+
+ kfree_skb(skb);
+ return -ENOBUFS;
+ }
+
+ /* Fill in the new cache entry */
+
+ c->mfc_parent = -1;
+ c->mfc_origin = iph->saddr;
+ c->mfc_mcastgrp = iph->daddr;
+
+ /* Reflect first query at mrouted. */
+
+ err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
+ if (err < 0) {
+ /* If the report failed throw the cache entry
+ out - Brad Parker
+ */
+ spin_unlock_bh(&mfc_unres_lock);
+
+ ipmr_cache_free(c);
+ kfree_skb(skb);
+ return err;
+ }
+
+ atomic_inc(&mrt->cache_resolve_queue_len);
+ list_add(&c->list, &mrt->mfc_unres_queue);
+ mroute_netlink_event(mrt, c, RTM_NEWROUTE);
+
+ if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
+ mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
+ }
+
+ /* See if we can append the packet */
+
+ if (c->mfc_un.unres.unresolved.qlen > 3) {
+ kfree_skb(skb);
+ err = -ENOBUFS;
+ } else {
+ skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
+ err = 0;
+ }
+
+ spin_unlock_bh(&mfc_unres_lock);
+ return err;
+}
+
+/*
+ * MFC cache manipulation by user space mroute daemon
+ */
+
+static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
+{
+ int line;
+ struct mfc_cache *c, *next;
+
+ line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
+
+ list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) {
+ if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
+ c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
+ (parent == -1 || parent == c->mfc_parent)) {
+ list_del_rcu(&c->list);
+ mroute_netlink_event(mrt, c, RTM_DELROUTE);
+ ipmr_cache_free(c);
+ return 0;
+ }
+ }
+ return -ENOENT;
+}
+
+static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
+ struct mfcctl *mfc, int mrtsock, int parent)
+{
+ bool found = false;
+ int line;
+ struct mfc_cache *uc, *c;
+
+ if (mfc->mfcc_parent >= MAXVIFS)
+ return -ENFILE;
+
+ line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
+
+ list_for_each_entry(c, &mrt->mfc_cache_array[line], list) {
+ if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
+ c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
+ (parent == -1 || parent == c->mfc_parent)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (found) {
+ write_lock_bh(&mrt_lock);
+ c->mfc_parent = mfc->mfcc_parent;
+ ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
+ if (!mrtsock)
+ c->mfc_flags |= MFC_STATIC;
+ write_unlock_bh(&mrt_lock);
+ 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->mfc_parent = mfc->mfcc_parent;
+ ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
+ if (!mrtsock)
+ c->mfc_flags |= MFC_STATIC;
+
+ list_add_rcu(&c->list, &mrt->mfc_cache_array[line]);
+
+ /*
+ * Check to see if we resolved a queued list. If so we
+ * need to send on the frames and tidy up.
+ */
+ found = false;
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry(uc, &mrt->mfc_unres_queue, list) {
+ if (uc->mfc_origin == c->mfc_origin &&
+ uc->mfc_mcastgrp == c->mfc_mcastgrp) {
+ list_del(&uc->list);
+ atomic_dec(&mrt->cache_resolve_queue_len);
+ found = true;
+ break;
+ }
+ }
+ if (list_empty(&mrt->mfc_unres_queue))
+ del_timer(&mrt->ipmr_expire_timer);
+ spin_unlock_bh(&mfc_unres_lock);
+
+ if (found) {
+ ipmr_cache_resolve(net, mrt, uc, c);
+ ipmr_cache_free(uc);
+ }
+ 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 i;
+ LIST_HEAD(list);
+ struct mfc_cache *c, *next;
+
+ /* Shut down all active vif entries */
+
+ for (i = 0; i < mrt->maxvif; i++) {
+ if (!(mrt->vif_table[i].flags & VIFF_STATIC))
+ vif_delete(mrt, i, 0, &list);
+ }
+ unregister_netdevice_many(&list);
+
+ /* Wipe the cache */
+
+ for (i = 0; i < MFC_LINES; i++) {
+ list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) {
+ if (c->mfc_flags & MFC_STATIC)
+ continue;
+ list_del_rcu(&c->list);
+ mroute_netlink_event(mrt, c, RTM_DELROUTE);
+ ipmr_cache_free(c);
+ }
+ }
+
+ if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
+ list_del(&c->list);
+ mroute_netlink_event(mrt, c, RTM_DELROUTE);
+ ipmr_destroy_unres(mrt, c);
+ }
+ spin_unlock_bh(&mfc_unres_lock);
+ }
+}
+
+/* called from ip_ra_control(), before an RCU grace period,
+ * we dont need to call synchronize_rcu() here
+ */
+static void mrtsock_destruct(struct sock *sk)
+{
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ rtnl_lock();
+ ipmr_for_each_table(mrt, net) {
+ if (sk == rtnl_dereference(mrt->mroute_sk)) {
+ IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
+ inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv4.devconf_all);
+ RCU_INIT_POINTER(mrt->mroute_sk, NULL);
+ mroute_clean_tables(mrt);
+ }
+ }
+ rtnl_unlock();
+}
+
+/*
+ * Socket options and virtual interface manipulation. The whole
+ * virtual interface system is a complete heap, but unfortunately
+ * that's how BSD mrouted happens to think. Maybe one day with a proper
+ * MOSPF/PIM router set up we can clean this up.
+ */
+
+int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
+{
+ int ret, parent = 0;
+ struct vifctl vif;
+ struct mfcctl mfc;
+ 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;
+
+ if (optname != MRT_INIT) {
+ if (sk != rcu_access_pointer(mrt->mroute_sk) &&
+ !ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EACCES;
+ }
+
+ switch (optname) {
+ case MRT_INIT:
+ if (optlen != sizeof(int))
+ return -EINVAL;
+
+ rtnl_lock();
+ if (rtnl_dereference(mrt->mroute_sk)) {
+ rtnl_unlock();
+ return -EADDRINUSE;
+ }
+
+ ret = ip_ra_control(sk, 1, mrtsock_destruct);
+ if (ret == 0) {
+ rcu_assign_pointer(mrt->mroute_sk, sk);
+ IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
+ inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv4.devconf_all);
+ }
+ rtnl_unlock();
+ return ret;
+ case MRT_DONE:
+ if (sk != rcu_access_pointer(mrt->mroute_sk))
+ return -EACCES;
+ return ip_ra_control(sk, 0, NULL);
+ case MRT_ADD_VIF:
+ case MRT_DEL_VIF:
+ if (optlen != sizeof(vif))
+ return -EINVAL;
+ if (copy_from_user(&vif, optval, sizeof(vif)))
+ return -EFAULT;
+ if (vif.vifc_vifi >= MAXVIFS)
+ return -ENFILE;
+ rtnl_lock();
+ if (optname == MRT_ADD_VIF) {
+ ret = vif_add(net, mrt, &vif,
+ sk == rtnl_dereference(mrt->mroute_sk));
+ } else {
+ ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
+ }
+ rtnl_unlock();
+ return ret;
+
+ /*
+ * Manipulate the forwarding caches. These live
+ * in a sort of kernel/user symbiosis.
+ */
+ case MRT_ADD_MFC:
+ case MRT_DEL_MFC:
+ parent = -1;
+ case MRT_ADD_MFC_PROXY:
+ case MRT_DEL_MFC_PROXY:
+ if (optlen != sizeof(mfc))
+ return -EINVAL;
+ if (copy_from_user(&mfc, optval, sizeof(mfc)))
+ return -EFAULT;
+ if (parent == 0)
+ parent = mfc.mfcc_parent;
+ rtnl_lock();
+ 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);
+ rtnl_unlock();
+ return ret;
+ /*
+ * Control PIM assert.
+ */
+ case MRT_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_IP_PIMSM
+ case MRT_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_IP_MROUTE_MULTIPLE_TABLES
+ case MRT_TABLE:
+ {
+ u32 v;
+
+ if (optlen != sizeof(u32))
+ return -EINVAL;
+ if (get_user(v, (u32 __user *)optval))
+ return -EFAULT;
+
+ /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
+ if (v != RT_TABLE_DEFAULT && v >= 1000000000)
+ return -EINVAL;
+
+ rtnl_lock();
+ ret = 0;
+ if (sk == rtnl_dereference(mrt->mroute_sk)) {
+ ret = -EBUSY;
+ } else {
+ if (!ipmr_new_table(net, v))
+ ret = -ENOMEM;
+ else
+ raw_sk(sk)->ipmr_table = v;
+ }
+ rtnl_unlock();
+ return ret;
+ }
+#endif
+ /*
+ * Spurious command, or MRT_VERSION which you cannot
+ * set.
+ */
+ default:
+ return -ENOPROTOOPT;
+ }
+}
+
+/*
+ * Getsock opt support for the multicast routing system.
+ */
+
+int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
+{
+ int olr;
+ int val;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ 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;
+
+ if (optname != MRT_VERSION &&
+#ifdef CONFIG_IP_PIMSM
+ optname != MRT_PIM &&
+#endif
+ optname != MRT_ASSERT)
+ return -ENOPROTOOPT;
+
+ if (get_user(olr, optlen))
+ return -EFAULT;
+
+ olr = min_t(unsigned int, olr, sizeof(int));
+ if (olr < 0)
+ return -EINVAL;
+
+ if (put_user(olr, optlen))
+ return -EFAULT;
+ if (optname == MRT_VERSION)
+ val = 0x0305;
+#ifdef CONFIG_IP_PIMSM
+ else if (optname == MRT_PIM)
+ val = mrt->mroute_do_pim;
+#endif
+ else
+ val = mrt->mroute_do_assert;
+ if (copy_to_user(optval, &val, olr))
+ return -EFAULT;
+ return 0;
+}
+
+/*
+ * The IP multicast ioctl support routines.
+ */
+
+int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
+{
+ struct sioc_sg_req sr;
+ struct sioc_vif_req vr;
+ struct vif_device *vif;
+ struct mfc_cache *c;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
+ if (!mrt)
+ return -ENOENT;
+
+ switch (cmd) {
+ case SIOCGETVIFCNT:
+ if (copy_from_user(&vr, arg, sizeof(vr)))
+ return -EFAULT;
+ if (vr.vifi >= mrt->maxvif)
+ return -EINVAL;
+ read_lock(&mrt_lock);
+ vif = &mrt->vif_table[vr.vifi];
+ if (VIF_EXISTS(mrt, vr.vifi)) {
+ vr.icount = vif->pkt_in;
+ vr.ocount = vif->pkt_out;
+ vr.ibytes = vif->bytes_in;
+ vr.obytes = vif->bytes_out;
+ read_unlock(&mrt_lock);
+
+ if (copy_to_user(arg, &vr, sizeof(vr)))
+ return -EFAULT;
+ return 0;
+ }
+ read_unlock(&mrt_lock);
+ return -EADDRNOTAVAIL;
+ case SIOCGETSGCNT:
+ if (copy_from_user(&sr, arg, sizeof(sr)))
+ return -EFAULT;
+
+ rcu_read_lock();
+ c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
+ if (c) {
+ sr.pktcnt = c->mfc_un.res.pkt;
+ sr.bytecnt = c->mfc_un.res.bytes;
+ sr.wrong_if = c->mfc_un.res.wrong_if;
+ rcu_read_unlock();
+
+ if (copy_to_user(arg, &sr, sizeof(sr)))
+ return -EFAULT;
+ return 0;
+ }
+ rcu_read_unlock();
+ return -EADDRNOTAVAIL;
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_sioc_sg_req {
+ struct in_addr src;
+ struct in_addr grp;
+ compat_ulong_t pktcnt;
+ compat_ulong_t bytecnt;
+ compat_ulong_t wrong_if;
+};
+
+struct compat_sioc_vif_req {
+ vifi_t vifi; /* Which iface */
+ compat_ulong_t icount;
+ compat_ulong_t ocount;
+ compat_ulong_t ibytes;
+ compat_ulong_t obytes;
+};
+
+int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
+{
+ struct compat_sioc_sg_req sr;
+ struct compat_sioc_vif_req vr;
+ struct vif_device *vif;
+ struct mfc_cache *c;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
+ if (!mrt)
+ return -ENOENT;
+
+ switch (cmd) {
+ case SIOCGETVIFCNT:
+ if (copy_from_user(&vr, arg, sizeof(vr)))
+ return -EFAULT;
+ if (vr.vifi >= mrt->maxvif)
+ return -EINVAL;
+ read_lock(&mrt_lock);
+ vif = &mrt->vif_table[vr.vifi];
+ if (VIF_EXISTS(mrt, vr.vifi)) {
+ vr.icount = vif->pkt_in;
+ vr.ocount = vif->pkt_out;
+ vr.ibytes = vif->bytes_in;
+ vr.obytes = vif->bytes_out;
+ read_unlock(&mrt_lock);
+
+ if (copy_to_user(arg, &vr, sizeof(vr)))
+ return -EFAULT;
+ return 0;
+ }
+ read_unlock(&mrt_lock);
+ return -EADDRNOTAVAIL;
+ case SIOCGETSGCNT:
+ if (copy_from_user(&sr, arg, sizeof(sr)))
+ return -EFAULT;
+
+ rcu_read_lock();
+ c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
+ if (c) {
+ sr.pktcnt = c->mfc_un.res.pkt;
+ sr.bytecnt = c->mfc_un.res.bytes;
+ sr.wrong_if = c->mfc_un.res.wrong_if;
+ rcu_read_unlock();
+
+ if (copy_to_user(arg, &sr, sizeof(sr)))
+ return -EFAULT;
+ return 0;
+ }
+ rcu_read_unlock();
+ return -EADDRNOTAVAIL;
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+#endif
+
+
+static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+ struct net_device *dev = 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 sock *sk, struct sk_buff *skb)
+{
+ struct ip_options *opt = &(IPCB(skb)->opt);
+
+ IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS);
+ IP_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTOCTETS, skb->len);
+
+ if (unlikely(opt->optlen))
+ ip_forward_options(skb);
+
+ return dst_output_sk(sk, skb);
+}
+
+/*
+ * Processing handlers for ipmr_forward
+ */
+
+static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
+ struct sk_buff *skb, struct mfc_cache *c, int vifi)
+{
+ const struct iphdr *iph = ip_hdr(skb);
+ struct vif_device *vif = &mrt->vif_table[vifi];
+ struct net_device *dev;
+ struct rtable *rt;
+ struct flowi4 fl4;
+ int encap = 0;
+
+ if (!vif->dev)
+ goto out_free;
+
+#ifdef CONFIG_IP_PIMSM
+ if (vif->flags & VIFF_REGISTER) {
+ vif->pkt_out++;
+ vif->bytes_out += skb->len;
+ vif->dev->stats.tx_bytes += skb->len;
+ vif->dev->stats.tx_packets++;
+ ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
+ goto out_free;
+ }
+#endif
+
+ if (vif->flags & VIFF_TUNNEL) {
+ rt = ip_route_output_ports(net, &fl4, NULL,
+ vif->remote, vif->local,
+ 0, 0,
+ IPPROTO_IPIP,
+ RT_TOS(iph->tos), vif->link);
+ if (IS_ERR(rt))
+ goto out_free;
+ encap = sizeof(struct iphdr);
+ } else {
+ rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
+ 0, 0,
+ IPPROTO_IPIP,
+ RT_TOS(iph->tos), vif->link);
+ if (IS_ERR(rt))
+ goto out_free;
+ }
+
+ dev = rt->dst.dev;
+
+ if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
+ /* Do not fragment multicasts. Alas, IPv4 does not
+ * allow to send ICMP, so that packets will disappear
+ * to blackhole.
+ */
+
+ IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
+ ip_rt_put(rt);
+ goto out_free;
+ }
+
+ encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
+
+ if (skb_cow(skb, encap)) {
+ ip_rt_put(rt);
+ goto out_free;
+ }
+
+ vif->pkt_out++;
+ vif->bytes_out += skb->len;
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ ip_decrease_ttl(ip_hdr(skb));
+
+ /* FIXME: forward and output firewalls used to be called here.
+ * What do we do with netfilter? -- RR
+ */
+ if (vif->flags & VIFF_TUNNEL) {
+ ip_encap(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, 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 sk_buff *skb, struct mfc_cache *cache,
+ int local)
+{
+ int psend = -1;
+ int vif, ct;
+ int true_vifi = ipmr_find_vif(mrt, skb->dev);
+
+ vif = cache->mfc_parent;
+ cache->mfc_un.res.pkt++;
+ cache->mfc_un.res.bytes += skb->len;
+
+ if (cache->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 = ipmr_cache_find_any_parent(mrt, vif);
+ if (cache_proxy &&
+ cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
+ goto forward;
+ }
+
+ /*
+ * Wrong interface: drop packet and (maybe) send PIM assert.
+ */
+ if (mrt->vif_table[vif].dev != skb->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;
+ }
+
+ cache->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 ||
+ cache->mfc_un.res.ttls[true_vifi] < 255) &&
+ time_after(jiffies,
+ cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
+ cache->mfc_un.res.last_assert = jiffies;
+ ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
+ }
+ goto dont_forward;
+ }
+
+forward:
+ mrt->vif_table[vif].pkt_in++;
+ mrt->vif_table[vif].bytes_in += skb->len;
+
+ /*
+ * Forward the frame
+ */
+ if (cache->mfc_origin == htonl(INADDR_ANY) &&
+ cache->mfc_mcastgrp == htonl(INADDR_ANY)) {
+ if (true_vifi >= 0 &&
+ true_vifi != cache->mfc_parent &&
+ ip_hdr(skb)->ttl >
+ cache->mfc_un.res.ttls[cache->mfc_parent]) {
+ /* It's an (*,*) entry and the packet is not coming from
+ * the upstream: forward the packet to the upstream
+ * only.
+ */
+ psend = cache->mfc_parent;
+ goto last_forward;
+ }
+ goto dont_forward;
+ }
+ for (ct = cache->mfc_un.res.maxvif - 1;
+ ct >= cache->mfc_un.res.minvif; ct--) {
+ /* For (*,G) entry, don't forward to the incoming interface */
+ if ((cache->mfc_origin != htonl(INADDR_ANY) ||
+ ct != true_vifi) &&
+ ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
+ if (psend != -1) {
+ struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+
+ if (skb2)
+ ipmr_queue_xmit(net, mrt, skb2, cache,
+ psend);
+ }
+ psend = ct;
+ }
+ }
+last_forward:
+ if (psend != -1) {
+ if (local) {
+ struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+
+ if (skb2)
+ ipmr_queue_xmit(net, mrt, skb2, cache, psend);
+ } else {
+ ipmr_queue_xmit(net, mrt, skb, cache, psend);
+ return;
+ }
+ }
+
+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;
+
+ /* 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, skb->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, skb->dev);
+ if (vif >= 0) {
+ int err2 = ipmr_cache_unresolved(mrt, vif, skb);
+ read_unlock(&mrt_lock);
+
+ return err2;
+ }
+ read_unlock(&mrt_lock);
+ kfree_skb(skb);
+ return -ENODEV;
+ }
+
+ read_lock(&mrt_lock);
+ ip_mr_forward(net, mrt, skb, cache, local);
+ read_unlock(&mrt_lock);
+
+ if (local)
+ return ip_local_deliver(skb);
+
+ return 0;
+
+dont_forward:
+ if (local)
+ return ip_local_deliver(skb);
+ kfree_skb(skb);
+ return 0;
+}
+
+#ifdef CONFIG_IP_PIMSM
+/* called with rcu_read_lock() */
+static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
+ unsigned int pimlen)
+{
+ struct net_device *reg_dev = NULL;
+ struct iphdr *encap;
+
+ encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
+ /*
+ * Check that:
+ * a. packet is really sent to a multicast group
+ * b. packet is not a NULL-REGISTER
+ * c. packet is not truncated
+ */
+ if (!ipv4_is_multicast(encap->daddr) ||
+ encap->tot_len == 0 ||
+ ntohs(encap->tot_len) + pimlen > skb->len)
+ return 1;
+
+ read_lock(&mrt_lock);
+ if (mrt->mroute_reg_vif_num >= 0)
+ reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
+ read_unlock(&mrt_lock);
+
+ if (!reg_dev)
+ 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;
+}
+#endif
+
+#ifdef CONFIG_IP_PIMSM_V1
+/*
+ * Handle IGMP messages of PIMv1
+ */
+
+int pim_rcv_v1(struct sk_buff *skb)
+{
+ struct igmphdr *pim;
+ struct net *net = dev_net(skb->dev);
+ struct mr_table *mrt;
+
+ if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
+ goto drop;
+
+ pim = igmp_hdr(skb);
+
+ mrt = ipmr_rt_fib_lookup(net, skb);
+ if (IS_ERR(mrt))
+ goto drop;
+ if (!mrt->mroute_do_pim ||
+ pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
+ goto drop;
+
+ if (__pim_rcv(mrt, skb, sizeof(*pim))) {
+drop:
+ kfree_skb(skb);
+ }
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_IP_PIMSM_V2
+static int pim_rcv(struct sk_buff *skb)
+{
+ struct pimreghdr *pim;
+ struct net *net = dev_net(skb->dev);
+ struct mr_table *mrt;
+
+ if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
+ goto drop;
+
+ pim = (struct pimreghdr *)skb_transport_header(skb);
+ if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) ||
+ (pim->flags & PIM_NULL_REGISTER) ||
+ (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
+ csum_fold(skb_checksum(skb, 0, skb->len, 0))))
+ goto drop;
+
+ mrt = ipmr_rt_fib_lookup(net, skb);
+ if (IS_ERR(mrt))
+ goto drop;
+ if (__pim_rcv(mrt, skb, sizeof(*pim))) {
+drop:
+ kfree_skb(skb);
+ }
+ return 0;
+}
+#endif
+
+static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
+ struct mfc_cache *c, struct rtmsg *rtm)
+{
+ int ct;
+ struct rtnexthop *nhp;
+ struct nlattr *mp_attr;
+ struct rta_mfc_stats mfcs;
+
+ /* If cache is unresolved, don't try to parse IIF and OIF */
+ if (c->mfc_parent >= MAXVIFS)
+ return -ENOENT;
+
+ if (VIF_EXISTS(mrt, c->mfc_parent) &&
+ nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
+ return -EMSGSIZE;
+
+ if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
+ return -EMSGSIZE;
+
+ for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
+ if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
+ if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) {
+ nla_nest_cancel(skb, mp_attr);
+ return -EMSGSIZE;
+ }
+
+ nhp->rtnh_flags = 0;
+ nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
+ nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex;
+ nhp->rtnh_len = sizeof(*nhp);
+ }
+ }
+
+ nla_nest_end(skb, mp_attr);
+
+ mfcs.mfcs_packets = c->mfc_un.res.pkt;
+ mfcs.mfcs_bytes = c->mfc_un.res.bytes;
+ mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
+ if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
+ return -EMSGSIZE;
+
+ rtm->rtm_type = RTN_MULTICAST;
+ return 1;
+}
+
+int ipmr_get_route(struct net *net, struct sk_buff *skb,
+ __be32 saddr, __be32 daddr,
+ struct rtmsg *rtm, int nowait)
+{
+ struct mfc_cache *cache;
+ struct mr_table *mrt;
+ int err;
+
+ mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
+ if (!mrt)
+ 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;
+
+ if (nowait) {
+ rcu_read_unlock();
+ return -EAGAIN;
+ }
+
+ dev = skb->dev;
+ read_lock(&mrt_lock);
+ if (dev)
+ vif = ipmr_find_vif(mrt, dev);
+ if (vif < 0) {
+ read_unlock(&mrt_lock);
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (!skb2) {
+ read_unlock(&mrt_lock);
+ rcu_read_unlock();
+ return -ENOMEM;
+ }
+
+ skb_push(skb2, sizeof(struct iphdr));
+ skb_reset_network_header(skb2);
+ iph = ip_hdr(skb2);
+ iph->ihl = sizeof(struct iphdr) >> 2;
+ iph->saddr = saddr;
+ iph->daddr = daddr;
+ iph->version = 0;
+ err = ipmr_cache_unresolved(mrt, vif, skb2);
+ read_unlock(&mrt_lock);
+ rcu_read_unlock();
+ return err;
+ }
+
+ read_lock(&mrt_lock);
+ if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY))
+ cache->mfc_flags |= MFC_NOTIFY;
+ err = __ipmr_fill_mroute(mrt, skb, cache, rtm);
+ read_unlock(&mrt_lock);
+ rcu_read_unlock();
+ return err;
+}
+
+static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
+ u32 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->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 = __ipmr_fill_mroute(mrt, skb, 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 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(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->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 int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct mr_table *mrt;
+ struct mfc_cache *mfc;
+ unsigned int t = 0, s_t;
+ unsigned int h = 0, s_h;
+ unsigned int e = 0, s_e;
+
+ s_t = cb->args[0];
+ s_h = cb->args[1];
+ s_e = cb->args[2];
+
+ rcu_read_lock();
+ ipmr_for_each_table(mrt, net) {
+ if (t < s_t)
+ goto next_table;
+ if (t > s_t)
+ s_h = 0;
+ for (h = s_h; h < MFC_LINES; h++) {
+ list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) {
+ if (e < s_e)
+ goto next_entry;
+ if (ipmr_fill_mroute(mrt, skb,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ mfc, RTM_NEWROUTE,
+ NLM_F_MULTI) < 0)
+ goto done;
+next_entry:
+ e++;
+ }
+ e = s_e = 0;
+ }
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) {
+ if (e < s_e)
+ goto next_entry2;
+ if (ipmr_fill_mroute(mrt, skb,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ mfc, RTM_NEWROUTE,
+ NLM_F_MULTI) < 0) {
+ spin_unlock_bh(&mfc_unres_lock);
+ goto done;
+ }
+next_entry2:
+ e++;
+ }
+ spin_unlock_bh(&mfc_unres_lock);
+ e = s_e = 0;
+ s_h = 0;
+next_table:
+ t++;
+ }
+done:
+ rcu_read_unlock();
+
+ cb->args[2] = e;
+ cb->args[1] = h;
+ cb->args[0] = t;
+
+ return skb->len;
+}
+
+#ifdef CONFIG_PROC_FS
+/*
+ * The /proc interfaces to multicast routing :
+ * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
+ */
+struct ipmr_vif_iter {
+ struct seq_net_private p;
+ struct mr_table *mrt;
+ int ct;
+};
+
+static struct vif_device *ipmr_vif_seq_idx(struct net *net,
+ struct ipmr_vif_iter *iter,
+ loff_t pos)
+{
+ struct mr_table *mrt = iter->mrt;
+
+ for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
+ if (!VIF_EXISTS(mrt, iter->ct))
+ continue;
+ if (pos-- == 0)
+ return &mrt->vif_table[iter->ct];
+ }
+ return NULL;
+}
+
+static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(mrt_lock)
+{
+ struct ipmr_vif_iter *iter = seq->private;
+ struct net *net = seq_file_net(seq);
+ struct mr_table *mrt;
+
+ mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
+ if (!mrt)
+ return ERR_PTR(-ENOENT);
+
+ iter->mrt = mrt;
+
+ read_lock(&mrt_lock);
+ return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1)
+ : SEQ_START_TOKEN;
+}
+
+static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct ipmr_vif_iter *iter = seq->private;
+ struct net *net = seq_file_net(seq);
+ struct mr_table *mrt = iter->mrt;
+
+ ++*pos;
+ if (v == SEQ_START_TOKEN)
+ return ipmr_vif_seq_idx(net, iter, 0);
+
+ while (++iter->ct < mrt->maxvif) {
+ if (!VIF_EXISTS(mrt, iter->ct))
+ continue;
+ return &mrt->vif_table[iter->ct];
+ }
+ return NULL;
+}
+
+static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
+ __releases(mrt_lock)
+{
+ read_unlock(&mrt_lock);
+}
+
+static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
+{
+ struct ipmr_vif_iter *iter = seq->private;
+ struct mr_table *mrt = iter->mrt;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq,
+ "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
+ } else {
+ const struct vif_device *vif = v;
+ const char *name = vif->dev ? vif->dev->name : "none";
+
+ seq_printf(seq,
+ "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
+ vif - mrt->vif_table,
+ name, vif->bytes_in, vif->pkt_in,
+ vif->bytes_out, vif->pkt_out,
+ vif->flags, vif->local, vif->remote);
+ }
+ return 0;
+}
+
+static const struct seq_operations ipmr_vif_seq_ops = {
+ .start = ipmr_vif_seq_start,
+ .next = ipmr_vif_seq_next,
+ .stop = ipmr_vif_seq_stop,
+ .show = ipmr_vif_seq_show,
+};
+
+static int ipmr_vif_open(struct inode *inode, struct file *file)
+{
+ return seq_open_net(inode, file, &ipmr_vif_seq_ops,
+ sizeof(struct ipmr_vif_iter));
+}
+
+static const struct file_operations ipmr_vif_fops = {
+ .owner = THIS_MODULE,
+ .open = ipmr_vif_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_net,
+};
+
+struct ipmr_mfc_iter {
+ struct seq_net_private p;
+ struct mr_table *mrt;
+ struct list_head *cache;
+ int ct;
+};
+
+
+static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net,
+ struct ipmr_mfc_iter *it, loff_t pos)
+{
+ struct mr_table *mrt = it->mrt;
+ struct mfc_cache *mfc;
+
+ rcu_read_lock();
+ for (it->ct = 0; it->ct < MFC_LINES; it->ct++) {
+ it->cache = &mrt->mfc_cache_array[it->ct];
+ list_for_each_entry_rcu(mfc, it->cache, list)
+ if (pos-- == 0)
+ return mfc;
+ }
+ rcu_read_unlock();
+
+ spin_lock_bh(&mfc_unres_lock);
+ it->cache = &mrt->mfc_unres_queue;
+ list_for_each_entry(mfc, it->cache, list)
+ if (pos-- == 0)
+ return mfc;
+ spin_unlock_bh(&mfc_unres_lock);
+
+ it->cache = NULL;
+ return NULL;
+}
+
+
+static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct ipmr_mfc_iter *it = seq->private;
+ struct net *net = seq_file_net(seq);
+ struct mr_table *mrt;
+
+ mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
+ if (!mrt)
+ return ERR_PTR(-ENOENT);
+
+ it->mrt = mrt;
+ it->cache = NULL;
+ it->ct = 0;
+ return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
+ : SEQ_START_TOKEN;
+}
+
+static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct mfc_cache *mfc = v;
+ struct ipmr_mfc_iter *it = seq->private;
+ struct net *net = seq_file_net(seq);
+ struct mr_table *mrt = it->mrt;
+
+ ++*pos;
+
+ if (v == SEQ_START_TOKEN)
+ return ipmr_mfc_seq_idx(net, seq->private, 0);
+
+ if (mfc->list.next != it->cache)
+ return list_entry(mfc->list.next, struct mfc_cache, list);
+
+ if (it->cache == &mrt->mfc_unres_queue)
+ goto end_of_list;
+
+ BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]);
+
+ while (++it->ct < MFC_LINES) {
+ it->cache = &mrt->mfc_cache_array[it->ct];
+ if (list_empty(it->cache))
+ continue;
+ return list_first_entry(it->cache, struct mfc_cache, list);
+ }
+
+ /* exhausted cache_array, show unresolved */
+ rcu_read_unlock();
+ it->cache = &mrt->mfc_unres_queue;
+ it->ct = 0;
+
+ spin_lock_bh(&mfc_unres_lock);
+ if (!list_empty(it->cache))
+ return list_first_entry(it->cache, struct mfc_cache, list);
+
+end_of_list:
+ spin_unlock_bh(&mfc_unres_lock);
+ it->cache = NULL;
+
+ return NULL;
+}
+
+static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
+{
+ struct ipmr_mfc_iter *it = seq->private;
+ struct mr_table *mrt = it->mrt;
+
+ if (it->cache == &mrt->mfc_unres_queue)
+ spin_unlock_bh(&mfc_unres_lock);
+ else if (it->cache == &mrt->mfc_cache_array[it->ct])
+ rcu_read_unlock();
+}
+
+static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
+{
+ int n;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq,
+ "Group Origin Iif Pkts Bytes Wrong Oifs\n");
+ } else {
+ const struct mfc_cache *mfc = v;
+ const struct ipmr_mfc_iter *it = seq->private;
+ const struct mr_table *mrt = it->mrt;
+
+ seq_printf(seq, "%08X %08X %-3hd",
+ (__force u32) mfc->mfc_mcastgrp,
+ (__force u32) mfc->mfc_origin,
+ mfc->mfc_parent);
+
+ if (it->cache != &mrt->mfc_unres_queue) {
+ seq_printf(seq, " %8lu %8lu %8lu",
+ mfc->mfc_un.res.pkt,
+ mfc->mfc_un.res.bytes,
+ mfc->mfc_un.res.wrong_if);
+ for (n = mfc->mfc_un.res.minvif;
+ n < mfc->mfc_un.res.maxvif; n++) {
+ if (VIF_EXISTS(mrt, n) &&
+ mfc->mfc_un.res.ttls[n] < 255)
+ seq_printf(seq,
+ " %2d:%-3d",
+ n, mfc->mfc_un.res.ttls[n]);
+ }
+ } else {
+ /* unresolved mfc_caches don't contain
+ * pkt, bytes and wrong_if values
+ */
+ seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
+ }
+ seq_putc(seq, '\n');
+ }
+ return 0;
+}
+
+static const struct seq_operations ipmr_mfc_seq_ops = {
+ .start = ipmr_mfc_seq_start,
+ .next = ipmr_mfc_seq_next,
+ .stop = ipmr_mfc_seq_stop,
+ .show = ipmr_mfc_seq_show,
+};
+
+static int ipmr_mfc_open(struct inode *inode, struct file *file)
+{
+ return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
+ sizeof(struct ipmr_mfc_iter));
+}
+
+static const struct file_operations ipmr_mfc_fops = {
+ .owner = THIS_MODULE,
+ .open = ipmr_mfc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_net,
+};
+#endif
+
+#ifdef CONFIG_IP_PIMSM_V2
+static const struct net_protocol pim_protocol = {
+ .handler = pim_rcv,
+ .netns_ok = 1,
+};
+#endif
+
+
+/*
+ * Setup for IP multicast routing
+ */
+static int __net_init ipmr_net_init(struct net *net)
+{
+ int err;
+
+ err = ipmr_rules_init(net);
+ if (err < 0)
+ goto fail;
+
+#ifdef CONFIG_PROC_FS
+ err = -ENOMEM;
+ if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops))
+ goto proc_vif_fail;
+ if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops))
+ goto proc_cache_fail;
+#endif
+ return 0;
+
+#ifdef CONFIG_PROC_FS
+proc_cache_fail:
+ remove_proc_entry("ip_mr_vif", net->proc_net);
+proc_vif_fail:
+ ipmr_rules_exit(net);
+#endif
+fail:
+ return err;
+}
+
+static void __net_exit ipmr_net_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry("ip_mr_cache", net->proc_net);
+ remove_proc_entry("ip_mr_vif", net->proc_net);
+#endif
+ ipmr_rules_exit(net);
+}
+
+static struct pernet_operations ipmr_net_ops = {
+ .init = ipmr_net_init,
+ .exit = ipmr_net_exit,
+};
+
+int __init ip_mr_init(void)
+{
+ int err;
+
+ mrt_cachep = kmem_cache_create("ip_mrt_cache",
+ sizeof(struct mfc_cache),
+ 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
+ NULL);
+ if (!mrt_cachep)
+ return -ENOMEM;
+
+ err = register_pernet_subsys(&ipmr_net_ops);
+ if (err)
+ goto reg_pernet_fail;
+
+ err = register_netdevice_notifier(&ip_mr_notifier);
+ if (err)
+ goto reg_notif_fail;
+#ifdef CONFIG_IP_PIMSM_V2
+ if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
+ pr_err("%s: can't add PIM protocol\n", __func__);
+ err = -EAGAIN;
+ goto add_proto_fail;
+ }
+#endif
+ rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
+ NULL, ipmr_rtm_dumproute, NULL);
+ return 0;
+
+#ifdef CONFIG_IP_PIMSM_V2
+add_proto_fail:
+ unregister_netdevice_notifier(&ip_mr_notifier);
+#endif
+reg_notif_fail:
+ unregister_pernet_subsys(&ipmr_net_ops);
+reg_pernet_fail:
+ kmem_cache_destroy(mrt_cachep);
+ return err;
+}
Code Review / kvmfornfv.git / blobdiff