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-rw-r--r--net/ipv6/ip6mr.c2636
1 files changed, 2636 insertions, 0 deletions
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
new file mode 100644
index 000000000..27fb54799
--- /dev/null
+++ b/net/ipv6/ip6mr.c
@@ -0,0 +1,2636 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Linux IPv6 multicast routing support for BSD pim6sd
+ * Based on net/ipv4/ipmr.c.
+ *
+ * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
+ * LSIIT Laboratory, Strasbourg, France
+ * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
+ * 6WIND, Paris, France
+ * Copyright (C)2007,2008 USAGI/WIDE Project
+ * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
+ */
+
+#include <linux/uaccess.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/compat.h>
+#include <linux/rhashtable.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <net/raw.h>
+#include <linux/notifier.h>
+#include <linux/if_arp.h>
+#include <net/checksum.h>
+#include <net/netlink.h>
+#include <net/fib_rules.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <linux/mroute6.h>
+#include <linux/pim.h>
+#include <net/addrconf.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/export.h>
+#include <net/ip6_checksum.h>
+#include <linux/netconf.h>
+#include <net/ip_tunnels.h>
+
+#include <linux/nospec.h>
+
+struct ip6mr_rule {
+ struct fib_rule common;
+};
+
+struct ip6mr_result {
+ struct mr_table *mrt;
+};
+
+/* Big lock, protecting vif table, mrt cache and mroute socket state.
+ Note that the changes are semaphored via rtnl_lock.
+ */
+
+static DEFINE_SPINLOCK(mrt_lock);
+
+static struct net_device *vif_dev_read(const struct vif_device *vif)
+{
+ return rcu_dereference(vif->dev);
+}
+
+/* Multicast router control variables */
+
+/* Special spinlock for queue of unresolved entries */
+static DEFINE_SPINLOCK(mfc_unres_lock);
+
+/* We return to original Alan's scheme. Hash table of resolved
+ entries is changed only in process context and protected
+ with weak lock mrt_lock. Queue of unresolved entries is protected
+ with strong spinlock mfc_unres_lock.
+
+ In this case data path is free of exclusive locks at all.
+ */
+
+static struct kmem_cache *mrt_cachep __read_mostly;
+
+static struct mr_table *ip6mr_new_table(struct net *net, u32 id);
+static void ip6mr_free_table(struct mr_table *mrt);
+
+static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
+ struct net_device *dev, struct sk_buff *skb,
+ struct mfc6_cache *cache);
+static int ip6mr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt,
+ mifi_t mifi, int assert);
+static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
+ int cmd);
+static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt);
+static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack);
+static int ip6mr_rtm_dumproute(struct sk_buff *skb,
+ struct netlink_callback *cb);
+static void mroute_clean_tables(struct mr_table *mrt, int flags);
+static void ipmr_expire_process(struct timer_list *t);
+
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+#define ip6mr_for_each_table(mrt, net) \
+ list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list, \
+ lockdep_rtnl_is_held() || \
+ list_empty(&net->ipv6.mr6_tables))
+
+static struct mr_table *ip6mr_mr_table_iter(struct net *net,
+ struct mr_table *mrt)
+{
+ struct mr_table *ret;
+
+ if (!mrt)
+ ret = list_entry_rcu(net->ipv6.mr6_tables.next,
+ struct mr_table, list);
+ else
+ ret = list_entry_rcu(mrt->list.next,
+ struct mr_table, list);
+
+ if (&ret->list == &net->ipv6.mr6_tables)
+ return NULL;
+ return ret;
+}
+
+static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
+{
+ struct mr_table *mrt;
+
+ ip6mr_for_each_table(mrt, net) {
+ if (mrt->id == id)
+ return mrt;
+ }
+ return NULL;
+}
+
+static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
+ struct mr_table **mrt)
+{
+ int err;
+ struct ip6mr_result res;
+ struct fib_lookup_arg arg = {
+ .result = &res,
+ .flags = FIB_LOOKUP_NOREF,
+ };
+
+ /* update flow if oif or iif point to device enslaved to l3mdev */
+ l3mdev_update_flow(net, flowi6_to_flowi(flp6));
+
+ err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
+ flowi6_to_flowi(flp6), 0, &arg);
+ if (err < 0)
+ return err;
+ *mrt = res.mrt;
+ return 0;
+}
+
+static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
+ int flags, struct fib_lookup_arg *arg)
+{
+ struct ip6mr_result *res = arg->result;
+ struct mr_table *mrt;
+
+ switch (rule->action) {
+ case FR_ACT_TO_TBL:
+ break;
+ case FR_ACT_UNREACHABLE:
+ return -ENETUNREACH;
+ case FR_ACT_PROHIBIT:
+ return -EACCES;
+ case FR_ACT_BLACKHOLE:
+ default:
+ return -EINVAL;
+ }
+
+ arg->table = fib_rule_get_table(rule, arg);
+
+ mrt = ip6mr_get_table(rule->fr_net, arg->table);
+ if (!mrt)
+ return -EAGAIN;
+ res->mrt = mrt;
+ return 0;
+}
+
+static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
+{
+ return 1;
+}
+
+static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
+ struct fib_rule_hdr *frh, struct nlattr **tb,
+ struct netlink_ext_ack *extack)
+{
+ return 0;
+}
+
+static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
+ struct nlattr **tb)
+{
+ return 1;
+}
+
+static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
+ struct fib_rule_hdr *frh)
+{
+ frh->dst_len = 0;
+ frh->src_len = 0;
+ frh->tos = 0;
+ return 0;
+}
+
+static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
+ .family = RTNL_FAMILY_IP6MR,
+ .rule_size = sizeof(struct ip6mr_rule),
+ .addr_size = sizeof(struct in6_addr),
+ .action = ip6mr_rule_action,
+ .match = ip6mr_rule_match,
+ .configure = ip6mr_rule_configure,
+ .compare = ip6mr_rule_compare,
+ .fill = ip6mr_rule_fill,
+ .nlgroup = RTNLGRP_IPV6_RULE,
+ .owner = THIS_MODULE,
+};
+
+static int __net_init ip6mr_rules_init(struct net *net)
+{
+ struct fib_rules_ops *ops;
+ struct mr_table *mrt;
+ int err;
+
+ ops = fib_rules_register(&ip6mr_rules_ops_template, net);
+ if (IS_ERR(ops))
+ return PTR_ERR(ops);
+
+ INIT_LIST_HEAD(&net->ipv6.mr6_tables);
+
+ mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
+ if (IS_ERR(mrt)) {
+ err = PTR_ERR(mrt);
+ goto err1;
+ }
+
+ err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
+ if (err < 0)
+ goto err2;
+
+ net->ipv6.mr6_rules_ops = ops;
+ return 0;
+
+err2:
+ rtnl_lock();
+ ip6mr_free_table(mrt);
+ rtnl_unlock();
+err1:
+ fib_rules_unregister(ops);
+ return err;
+}
+
+static void __net_exit ip6mr_rules_exit(struct net *net)
+{
+ struct mr_table *mrt, *next;
+
+ ASSERT_RTNL();
+ list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
+ list_del(&mrt->list);
+ ip6mr_free_table(mrt);
+ }
+ fib_rules_unregister(net->ipv6.mr6_rules_ops);
+}
+
+static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
+ struct netlink_ext_ack *extack)
+{
+ return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR, extack);
+}
+
+static unsigned int ip6mr_rules_seq_read(struct net *net)
+{
+ return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR);
+}
+
+bool ip6mr_rule_default(const struct fib_rule *rule)
+{
+ return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
+ rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
+}
+EXPORT_SYMBOL(ip6mr_rule_default);
+#else
+#define ip6mr_for_each_table(mrt, net) \
+ for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
+
+static struct mr_table *ip6mr_mr_table_iter(struct net *net,
+ struct mr_table *mrt)
+{
+ if (!mrt)
+ return net->ipv6.mrt6;
+ return NULL;
+}
+
+static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
+{
+ return net->ipv6.mrt6;
+}
+
+static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
+ struct mr_table **mrt)
+{
+ *mrt = net->ipv6.mrt6;
+ return 0;
+}
+
+static int __net_init ip6mr_rules_init(struct net *net)
+{
+ struct mr_table *mrt;
+
+ mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
+ if (IS_ERR(mrt))
+ return PTR_ERR(mrt);
+ net->ipv6.mrt6 = mrt;
+ return 0;
+}
+
+static void __net_exit ip6mr_rules_exit(struct net *net)
+{
+ ASSERT_RTNL();
+ ip6mr_free_table(net->ipv6.mrt6);
+ net->ipv6.mrt6 = NULL;
+}
+
+static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
+ struct netlink_ext_ack *extack)
+{
+ return 0;
+}
+
+static unsigned int ip6mr_rules_seq_read(struct net *net)
+{
+ return 0;
+}
+#endif
+
+static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg,
+ const void *ptr)
+{
+ const struct mfc6_cache_cmp_arg *cmparg = arg->key;
+ struct mfc6_cache *c = (struct mfc6_cache *)ptr;
+
+ return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) ||
+ !ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin);
+}
+
+static const struct rhashtable_params ip6mr_rht_params = {
+ .head_offset = offsetof(struct mr_mfc, mnode),
+ .key_offset = offsetof(struct mfc6_cache, cmparg),
+ .key_len = sizeof(struct mfc6_cache_cmp_arg),
+ .nelem_hint = 3,
+ .obj_cmpfn = ip6mr_hash_cmp,
+ .automatic_shrinking = true,
+};
+
+static void ip6mr_new_table_set(struct mr_table *mrt,
+ struct net *net)
+{
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+ list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
+#endif
+}
+
+static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = {
+ .mf6c_origin = IN6ADDR_ANY_INIT,
+ .mf6c_mcastgrp = IN6ADDR_ANY_INIT,
+};
+
+static struct mr_table_ops ip6mr_mr_table_ops = {
+ .rht_params = &ip6mr_rht_params,
+ .cmparg_any = &ip6mr_mr_table_ops_cmparg_any,
+};
+
+static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
+{
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, id);
+ if (mrt)
+ return mrt;
+
+ return mr_table_alloc(net, id, &ip6mr_mr_table_ops,
+ ipmr_expire_process, ip6mr_new_table_set);
+}
+
+static void ip6mr_free_table(struct mr_table *mrt)
+{
+ del_timer_sync(&mrt->ipmr_expire_timer);
+ mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC |
+ MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC);
+ rhltable_destroy(&mrt->mfc_hash);
+ kfree(mrt);
+}
+
+#ifdef CONFIG_PROC_FS
+/* The /proc interfaces to multicast routing
+ * /proc/ip6_mr_cache /proc/ip6_mr_vif
+ */
+
+static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(RCU)
+{
+ struct mr_vif_iter *iter = seq->private;
+ struct net *net = seq_file_net(seq);
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+ if (!mrt)
+ return ERR_PTR(-ENOENT);
+
+ iter->mrt = mrt;
+
+ rcu_read_lock();
+ return mr_vif_seq_start(seq, pos);
+}
+
+static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
+ __releases(RCU)
+{
+ rcu_read_unlock();
+}
+
+static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
+{
+ struct mr_vif_iter *iter = seq->private;
+ struct mr_table *mrt = iter->mrt;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq,
+ "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
+ } else {
+ const struct vif_device *vif = v;
+ const struct net_device *vif_dev;
+ const char *name;
+
+ vif_dev = vif_dev_read(vif);
+ name = vif_dev ? vif_dev->name : "none";
+
+ seq_printf(seq,
+ "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
+ vif - mrt->vif_table,
+ name, vif->bytes_in, vif->pkt_in,
+ vif->bytes_out, vif->pkt_out,
+ vif->flags);
+ }
+ return 0;
+}
+
+static const struct seq_operations ip6mr_vif_seq_ops = {
+ .start = ip6mr_vif_seq_start,
+ .next = mr_vif_seq_next,
+ .stop = ip6mr_vif_seq_stop,
+ .show = ip6mr_vif_seq_show,
+};
+
+static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct net *net = seq_file_net(seq);
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+ if (!mrt)
+ return ERR_PTR(-ENOENT);
+
+ return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
+}
+
+static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
+{
+ int n;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq,
+ "Group "
+ "Origin "
+ "Iif Pkts Bytes Wrong Oifs\n");
+ } else {
+ const struct mfc6_cache *mfc = v;
+ const struct mr_mfc_iter *it = seq->private;
+ struct mr_table *mrt = it->mrt;
+
+ seq_printf(seq, "%pI6 %pI6 %-3hd",
+ &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
+ mfc->_c.mfc_parent);
+
+ if (it->cache != &mrt->mfc_unres_queue) {
+ seq_printf(seq, " %8lu %8lu %8lu",
+ mfc->_c.mfc_un.res.pkt,
+ mfc->_c.mfc_un.res.bytes,
+ mfc->_c.mfc_un.res.wrong_if);
+ for (n = mfc->_c.mfc_un.res.minvif;
+ n < mfc->_c.mfc_un.res.maxvif; n++) {
+ if (VIF_EXISTS(mrt, n) &&
+ mfc->_c.mfc_un.res.ttls[n] < 255)
+ seq_printf(seq,
+ " %2d:%-3d", n,
+ mfc->_c.mfc_un.res.ttls[n]);
+ }
+ } else {
+ /* unresolved mfc_caches don't contain
+ * pkt, bytes and wrong_if values
+ */
+ seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
+ }
+ seq_putc(seq, '\n');
+ }
+ return 0;
+}
+
+static const struct seq_operations ipmr_mfc_seq_ops = {
+ .start = ipmr_mfc_seq_start,
+ .next = mr_mfc_seq_next,
+ .stop = mr_mfc_seq_stop,
+ .show = ipmr_mfc_seq_show,
+};
+#endif
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+
+static int pim6_rcv(struct sk_buff *skb)
+{
+ struct pimreghdr *pim;
+ struct ipv6hdr *encap;
+ struct net_device *reg_dev = NULL;
+ struct net *net = dev_net(skb->dev);
+ struct mr_table *mrt;
+ struct flowi6 fl6 = {
+ .flowi6_iif = skb->dev->ifindex,
+ .flowi6_mark = skb->mark,
+ };
+ int reg_vif_num;
+
+ if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
+ goto drop;
+
+ pim = (struct pimreghdr *)skb_transport_header(skb);
+ if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) ||
+ (pim->flags & PIM_NULL_REGISTER) ||
+ (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
+ sizeof(*pim), IPPROTO_PIM,
+ csum_partial((void *)pim, sizeof(*pim), 0)) &&
+ csum_fold(skb_checksum(skb, 0, skb->len, 0))))
+ goto drop;
+
+ /* check if the inner packet is destined to mcast group */
+ encap = (struct ipv6hdr *)(skb_transport_header(skb) +
+ sizeof(*pim));
+
+ if (!ipv6_addr_is_multicast(&encap->daddr) ||
+ encap->payload_len == 0 ||
+ ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
+ goto drop;
+
+ if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
+ goto drop;
+
+ /* Pairs with WRITE_ONCE() in mif6_add()/mif6_delete() */
+ reg_vif_num = READ_ONCE(mrt->mroute_reg_vif_num);
+ if (reg_vif_num >= 0)
+ reg_dev = vif_dev_read(&mrt->vif_table[reg_vif_num]);
+
+ if (!reg_dev)
+ goto drop;
+
+ skb->mac_header = skb->network_header;
+ skb_pull(skb, (u8 *)encap - skb->data);
+ skb_reset_network_header(skb);
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->ip_summed = CHECKSUM_NONE;
+
+ skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
+
+ netif_rx(skb);
+
+ return 0;
+ drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static const struct inet6_protocol pim6_protocol = {
+ .handler = pim6_rcv,
+};
+
+/* Service routines creating virtual interfaces: PIMREG */
+
+static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct net *net = dev_net(dev);
+ struct mr_table *mrt;
+ struct flowi6 fl6 = {
+ .flowi6_oif = dev->ifindex,
+ .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
+ .flowi6_mark = skb->mark,
+ };
+
+ if (!pskb_inet_may_pull(skb))
+ goto tx_err;
+
+ if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
+ goto tx_err;
+
+ dev->stats.tx_bytes += skb->len;
+ dev->stats.tx_packets++;
+ rcu_read_lock();
+ ip6mr_cache_report(mrt, skb, READ_ONCE(mrt->mroute_reg_vif_num),
+ MRT6MSG_WHOLEPKT);
+ rcu_read_unlock();
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+
+tx_err:
+ dev->stats.tx_errors++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static int reg_vif_get_iflink(const struct net_device *dev)
+{
+ return 0;
+}
+
+static const struct net_device_ops reg_vif_netdev_ops = {
+ .ndo_start_xmit = reg_vif_xmit,
+ .ndo_get_iflink = reg_vif_get_iflink,
+};
+
+static void reg_vif_setup(struct net_device *dev)
+{
+ dev->type = ARPHRD_PIMREG;
+ dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
+ dev->flags = IFF_NOARP;
+ dev->netdev_ops = &reg_vif_netdev_ops;
+ dev->needs_free_netdev = true;
+ dev->features |= NETIF_F_NETNS_LOCAL;
+}
+
+static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt)
+{
+ struct net_device *dev;
+ char name[IFNAMSIZ];
+
+ if (mrt->id == RT6_TABLE_DFLT)
+ sprintf(name, "pim6reg");
+ else
+ sprintf(name, "pim6reg%u", mrt->id);
+
+ dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
+ if (!dev)
+ return NULL;
+
+ dev_net_set(dev, net);
+
+ if (register_netdevice(dev)) {
+ free_netdev(dev);
+ return NULL;
+ }
+
+ if (dev_open(dev, NULL))
+ goto failure;
+
+ dev_hold(dev);
+ return dev;
+
+failure:
+ unregister_netdevice(dev);
+ return NULL;
+}
+#endif
+
+static int call_ip6mr_vif_entry_notifiers(struct net *net,
+ enum fib_event_type event_type,
+ struct vif_device *vif,
+ struct net_device *vif_dev,
+ mifi_t vif_index, u32 tb_id)
+{
+ return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
+ vif, vif_dev, vif_index, tb_id,
+ &net->ipv6.ipmr_seq);
+}
+
+static int call_ip6mr_mfc_entry_notifiers(struct net *net,
+ enum fib_event_type event_type,
+ struct mfc6_cache *mfc, u32 tb_id)
+{
+ return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
+ &mfc->_c, tb_id, &net->ipv6.ipmr_seq);
+}
+
+/* Delete a VIF entry */
+static int mif6_delete(struct mr_table *mrt, int vifi, int notify,
+ struct list_head *head)
+{
+ struct vif_device *v;
+ struct net_device *dev;
+ struct inet6_dev *in6_dev;
+
+ if (vifi < 0 || vifi >= mrt->maxvif)
+ return -EADDRNOTAVAIL;
+
+ v = &mrt->vif_table[vifi];
+
+ dev = rtnl_dereference(v->dev);
+ if (!dev)
+ return -EADDRNOTAVAIL;
+
+ call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->net),
+ FIB_EVENT_VIF_DEL, v, dev,
+ vifi, mrt->id);
+ spin_lock(&mrt_lock);
+ RCU_INIT_POINTER(v->dev, NULL);
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (vifi == mrt->mroute_reg_vif_num) {
+ /* Pairs with READ_ONCE() in ip6mr_cache_report() and reg_vif_xmit() */
+ WRITE_ONCE(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;
+ }
+ WRITE_ONCE(mrt->maxvif, tmp + 1);
+ }
+
+ spin_unlock(&mrt_lock);
+
+ dev_set_allmulti(dev, -1);
+
+ in6_dev = __in6_dev_get(dev);
+ if (in6_dev) {
+ atomic_dec(&in6_dev->cnf.mc_forwarding);
+ inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
+ NETCONFA_MC_FORWARDING,
+ dev->ifindex, &in6_dev->cnf);
+ }
+
+ if ((v->flags & MIFF_REGISTER) && !notify)
+ unregister_netdevice_queue(dev, head);
+
+ netdev_put(dev, &v->dev_tracker);
+ return 0;
+}
+
+static inline void ip6mr_cache_free_rcu(struct rcu_head *head)
+{
+ struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
+
+ kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c);
+}
+
+static inline void ip6mr_cache_free(struct mfc6_cache *c)
+{
+ call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu);
+}
+
+/* Destroy an unresolved cache entry, killing queued skbs
+ and reporting error to netlink readers.
+ */
+
+static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c)
+{
+ struct net *net = read_pnet(&mrt->net);
+ struct sk_buff *skb;
+
+ atomic_dec(&mrt->cache_resolve_queue_len);
+
+ while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) {
+ if (ipv6_hdr(skb)->version == 0) {
+ struct nlmsghdr *nlh = skb_pull(skb,
+ sizeof(struct ipv6hdr));
+ nlh->nlmsg_type = NLMSG_ERROR;
+ nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
+ skb_trim(skb, nlh->nlmsg_len);
+ ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
+ rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
+ } else
+ kfree_skb(skb);
+ }
+
+ ip6mr_cache_free(c);
+}
+
+
+/* Timer process for all the unresolved queue. */
+
+static void ipmr_do_expire_process(struct mr_table *mrt)
+{
+ unsigned long now = jiffies;
+ unsigned long expires = 10 * HZ;
+ struct mr_mfc *c, *next;
+
+ list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
+ if (time_after(c->mfc_un.unres.expires, now)) {
+ /* not yet... */
+ unsigned long interval = c->mfc_un.unres.expires - now;
+ if (interval < expires)
+ expires = interval;
+ continue;
+ }
+
+ list_del(&c->list);
+ mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
+ ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
+ }
+
+ if (!list_empty(&mrt->mfc_unres_queue))
+ mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
+}
+
+static void ipmr_expire_process(struct timer_list *t)
+{
+ struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
+
+ if (!spin_trylock(&mfc_unres_lock)) {
+ mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
+ return;
+ }
+
+ if (!list_empty(&mrt->mfc_unres_queue))
+ ipmr_do_expire_process(mrt);
+
+ spin_unlock(&mfc_unres_lock);
+}
+
+/* Fill oifs list. It is called under locked mrt_lock. */
+
+static void ip6mr_update_thresholds(struct mr_table *mrt,
+ struct mr_mfc *cache,
+ unsigned char *ttls)
+{
+ int vifi;
+
+ cache->mfc_un.res.minvif = MAXMIFS;
+ cache->mfc_un.res.maxvif = 0;
+ memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
+
+ for (vifi = 0; vifi < mrt->maxvif; vifi++) {
+ if (VIF_EXISTS(mrt, vifi) &&
+ ttls[vifi] && ttls[vifi] < 255) {
+ cache->mfc_un.res.ttls[vifi] = ttls[vifi];
+ if (cache->mfc_un.res.minvif > vifi)
+ cache->mfc_un.res.minvif = vifi;
+ if (cache->mfc_un.res.maxvif <= vifi)
+ cache->mfc_un.res.maxvif = vifi + 1;
+ }
+ }
+ cache->mfc_un.res.lastuse = jiffies;
+}
+
+static int mif6_add(struct net *net, struct mr_table *mrt,
+ struct mif6ctl *vifc, int mrtsock)
+{
+ int vifi = vifc->mif6c_mifi;
+ struct vif_device *v = &mrt->vif_table[vifi];
+ struct net_device *dev;
+ struct inet6_dev *in6_dev;
+ int err;
+
+ /* Is vif busy ? */
+ if (VIF_EXISTS(mrt, vifi))
+ return -EADDRINUSE;
+
+ switch (vifc->mif6c_flags) {
+#ifdef CONFIG_IPV6_PIMSM_V2
+ case MIFF_REGISTER:
+ /*
+ * Special Purpose VIF in PIM
+ * All the packets will be sent to the daemon
+ */
+ if (mrt->mroute_reg_vif_num >= 0)
+ return -EADDRINUSE;
+ dev = ip6mr_reg_vif(net, mrt);
+ if (!dev)
+ return -ENOBUFS;
+ err = dev_set_allmulti(dev, 1);
+ if (err) {
+ unregister_netdevice(dev);
+ dev_put(dev);
+ return err;
+ }
+ break;
+#endif
+ case 0:
+ dev = dev_get_by_index(net, vifc->mif6c_pifi);
+ if (!dev)
+ return -EADDRNOTAVAIL;
+ err = dev_set_allmulti(dev, 1);
+ if (err) {
+ dev_put(dev);
+ return err;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ in6_dev = __in6_dev_get(dev);
+ if (in6_dev) {
+ atomic_inc(&in6_dev->cnf.mc_forwarding);
+ inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
+ NETCONFA_MC_FORWARDING,
+ dev->ifindex, &in6_dev->cnf);
+ }
+
+ /* Fill in the VIF structures */
+ vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold,
+ vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0),
+ MIFF_REGISTER);
+
+ /* And finish update writing critical data */
+ spin_lock(&mrt_lock);
+ rcu_assign_pointer(v->dev, dev);
+ netdev_tracker_alloc(dev, &v->dev_tracker, GFP_ATOMIC);
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (v->flags & MIFF_REGISTER)
+ WRITE_ONCE(mrt->mroute_reg_vif_num, vifi);
+#endif
+ if (vifi + 1 > mrt->maxvif)
+ WRITE_ONCE(mrt->maxvif, vifi + 1);
+ spin_unlock(&mrt_lock);
+ call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD,
+ v, dev, vifi, mrt->id);
+ return 0;
+}
+
+static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt,
+ const struct in6_addr *origin,
+ const struct in6_addr *mcastgrp)
+{
+ struct mfc6_cache_cmp_arg arg = {
+ .mf6c_origin = *origin,
+ .mf6c_mcastgrp = *mcastgrp,
+ };
+
+ return mr_mfc_find(mrt, &arg);
+}
+
+/* Look for a (*,G) entry */
+static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt,
+ struct in6_addr *mcastgrp,
+ mifi_t mifi)
+{
+ struct mfc6_cache_cmp_arg arg = {
+ .mf6c_origin = in6addr_any,
+ .mf6c_mcastgrp = *mcastgrp,
+ };
+
+ if (ipv6_addr_any(mcastgrp))
+ return mr_mfc_find_any_parent(mrt, mifi);
+ return mr_mfc_find_any(mrt, mifi, &arg);
+}
+
+/* Look for a (S,G,iif) entry if parent != -1 */
+static struct mfc6_cache *
+ip6mr_cache_find_parent(struct mr_table *mrt,
+ const struct in6_addr *origin,
+ const struct in6_addr *mcastgrp,
+ int parent)
+{
+ struct mfc6_cache_cmp_arg arg = {
+ .mf6c_origin = *origin,
+ .mf6c_mcastgrp = *mcastgrp,
+ };
+
+ return mr_mfc_find_parent(mrt, &arg, parent);
+}
+
+/* Allocate a multicast cache entry */
+static struct mfc6_cache *ip6mr_cache_alloc(void)
+{
+ struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
+ if (!c)
+ return NULL;
+ c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
+ c->_c.mfc_un.res.minvif = MAXMIFS;
+ c->_c.free = ip6mr_cache_free_rcu;
+ refcount_set(&c->_c.mfc_un.res.refcount, 1);
+ return c;
+}
+
+static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
+{
+ struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
+ if (!c)
+ return NULL;
+ skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
+ c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
+ return c;
+}
+
+/*
+ * A cache entry has gone into a resolved state from queued
+ */
+
+static void ip6mr_cache_resolve(struct net *net, struct mr_table *mrt,
+ struct mfc6_cache *uc, struct mfc6_cache *c)
+{
+ struct sk_buff *skb;
+
+ /*
+ * Play the pending entries through our router
+ */
+
+ while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
+ if (ipv6_hdr(skb)->version == 0) {
+ struct nlmsghdr *nlh = skb_pull(skb,
+ sizeof(struct ipv6hdr));
+
+ if (mr_fill_mroute(mrt, skb, &c->_c,
+ nlmsg_data(nlh)) > 0) {
+ nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
+ } else {
+ nlh->nlmsg_type = NLMSG_ERROR;
+ nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
+ skb_trim(skb, nlh->nlmsg_len);
+ ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
+ }
+ rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
+ } else {
+ rcu_read_lock();
+ ip6_mr_forward(net, mrt, skb->dev, skb, c);
+ rcu_read_unlock();
+ }
+ }
+}
+
+/*
+ * Bounce a cache query up to pim6sd and netlink.
+ *
+ * Called under rcu_read_lock()
+ */
+
+static int ip6mr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt,
+ mifi_t mifi, int assert)
+{
+ struct sock *mroute6_sk;
+ struct sk_buff *skb;
+ struct mrt6msg *msg;
+ int ret;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (assert == MRT6MSG_WHOLEPKT || assert == MRT6MSG_WRMIFWHOLE)
+ skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
+ +sizeof(*msg));
+ else
+#endif
+ skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
+
+ if (!skb)
+ return -ENOBUFS;
+
+ /* I suppose that internal messages
+ * do not require checksums */
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (assert == MRT6MSG_WHOLEPKT || assert == MRT6MSG_WRMIFWHOLE) {
+ /* Ugly, but we have no choice with this interface.
+ Duplicate old header, fix length etc.
+ And all this only to mangle msg->im6_msgtype and
+ to set msg->im6_mbz to "mbz" :-)
+ */
+ __skb_pull(skb, skb_network_offset(pkt));
+
+ skb_push(skb, sizeof(*msg));
+ skb_reset_transport_header(skb);
+ msg = (struct mrt6msg *)skb_transport_header(skb);
+ msg->im6_mbz = 0;
+ msg->im6_msgtype = assert;
+ if (assert == MRT6MSG_WRMIFWHOLE)
+ msg->im6_mif = mifi;
+ else
+ msg->im6_mif = READ_ONCE(mrt->mroute_reg_vif_num);
+ msg->im6_pad = 0;
+ msg->im6_src = ipv6_hdr(pkt)->saddr;
+ msg->im6_dst = ipv6_hdr(pkt)->daddr;
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ } else
+#endif
+ {
+ /*
+ * Copy the IP header
+ */
+
+ skb_put(skb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb);
+ skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
+
+ /*
+ * Add our header
+ */
+ skb_put(skb, sizeof(*msg));
+ skb_reset_transport_header(skb);
+ msg = (struct mrt6msg *)skb_transport_header(skb);
+
+ msg->im6_mbz = 0;
+ msg->im6_msgtype = assert;
+ msg->im6_mif = mifi;
+ msg->im6_pad = 0;
+ msg->im6_src = ipv6_hdr(pkt)->saddr;
+ msg->im6_dst = ipv6_hdr(pkt)->daddr;
+
+ skb_dst_set(skb, dst_clone(skb_dst(pkt)));
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+
+ mroute6_sk = rcu_dereference(mrt->mroute_sk);
+ if (!mroute6_sk) {
+ kfree_skb(skb);
+ return -EINVAL;
+ }
+
+ mrt6msg_netlink_event(mrt, skb);
+
+ /* Deliver to user space multicast routing algorithms */
+ ret = sock_queue_rcv_skb(mroute6_sk, skb);
+
+ if (ret < 0) {
+ net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
+ kfree_skb(skb);
+ }
+
+ return ret;
+}
+
+/* Queue a packet for resolution. It gets locked cache entry! */
+static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi,
+ struct sk_buff *skb, struct net_device *dev)
+{
+ struct mfc6_cache *c;
+ bool found = false;
+ int err;
+
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
+ if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
+ ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ /*
+ * Create a new entry if allowable
+ */
+
+ c = ip6mr_cache_alloc_unres();
+ if (!c) {
+ spin_unlock_bh(&mfc_unres_lock);
+
+ kfree_skb(skb);
+ return -ENOBUFS;
+ }
+
+ /* Fill in the new cache entry */
+ c->_c.mfc_parent = -1;
+ c->mf6c_origin = ipv6_hdr(skb)->saddr;
+ c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
+
+ /*
+ * Reflect first query at pim6sd
+ */
+ err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
+ if (err < 0) {
+ /* If the report failed throw the cache entry
+ out - Brad Parker
+ */
+ spin_unlock_bh(&mfc_unres_lock);
+
+ ip6mr_cache_free(c);
+ kfree_skb(skb);
+ return err;
+ }
+
+ atomic_inc(&mrt->cache_resolve_queue_len);
+ list_add(&c->_c.list, &mrt->mfc_unres_queue);
+ mr6_netlink_event(mrt, c, RTM_NEWROUTE);
+
+ ipmr_do_expire_process(mrt);
+ }
+
+ /* See if we can append the packet */
+ if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
+ kfree_skb(skb);
+ err = -ENOBUFS;
+ } else {
+ if (dev) {
+ skb->dev = dev;
+ skb->skb_iif = dev->ifindex;
+ }
+ skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
+ err = 0;
+ }
+
+ spin_unlock_bh(&mfc_unres_lock);
+ return err;
+}
+
+/*
+ * MFC6 cache manipulation by user space
+ */
+
+static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc,
+ int parent)
+{
+ struct mfc6_cache *c;
+
+ /* The entries are added/deleted only under RTNL */
+ rcu_read_lock();
+ c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
+ &mfc->mf6cc_mcastgrp.sin6_addr, parent);
+ rcu_read_unlock();
+ if (!c)
+ return -ENOENT;
+ rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params);
+ list_del_rcu(&c->_c.list);
+
+ call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
+ FIB_EVENT_ENTRY_DEL, c, mrt->id);
+ mr6_netlink_event(mrt, c, RTM_DELROUTE);
+ mr_cache_put(&c->_c);
+ return 0;
+}
+
+static int ip6mr_device_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct net *net = dev_net(dev);
+ struct mr_table *mrt;
+ struct vif_device *v;
+ int ct;
+
+ if (event != NETDEV_UNREGISTER)
+ return NOTIFY_DONE;
+
+ ip6mr_for_each_table(mrt, net) {
+ v = &mrt->vif_table[0];
+ for (ct = 0; ct < mrt->maxvif; ct++, v++) {
+ if (rcu_access_pointer(v->dev) == dev)
+ mif6_delete(mrt, ct, 1, NULL);
+ }
+ }
+
+ return NOTIFY_DONE;
+}
+
+static unsigned int ip6mr_seq_read(struct net *net)
+{
+ ASSERT_RTNL();
+
+ return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net);
+}
+
+static int ip6mr_dump(struct net *net, struct notifier_block *nb,
+ struct netlink_ext_ack *extack)
+{
+ return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump,
+ ip6mr_mr_table_iter, extack);
+}
+
+static struct notifier_block ip6_mr_notifier = {
+ .notifier_call = ip6mr_device_event
+};
+
+static const struct fib_notifier_ops ip6mr_notifier_ops_template = {
+ .family = RTNL_FAMILY_IP6MR,
+ .fib_seq_read = ip6mr_seq_read,
+ .fib_dump = ip6mr_dump,
+ .owner = THIS_MODULE,
+};
+
+static int __net_init ip6mr_notifier_init(struct net *net)
+{
+ struct fib_notifier_ops *ops;
+
+ net->ipv6.ipmr_seq = 0;
+
+ ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net);
+ if (IS_ERR(ops))
+ return PTR_ERR(ops);
+
+ net->ipv6.ip6mr_notifier_ops = ops;
+
+ return 0;
+}
+
+static void __net_exit ip6mr_notifier_exit(struct net *net)
+{
+ fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops);
+ net->ipv6.ip6mr_notifier_ops = NULL;
+}
+
+/* Setup for IP multicast routing */
+static int __net_init ip6mr_net_init(struct net *net)
+{
+ int err;
+
+ err = ip6mr_notifier_init(net);
+ if (err)
+ return err;
+
+ err = ip6mr_rules_init(net);
+ if (err < 0)
+ goto ip6mr_rules_fail;
+
+#ifdef CONFIG_PROC_FS
+ err = -ENOMEM;
+ if (!proc_create_net("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_seq_ops,
+ sizeof(struct mr_vif_iter)))
+ goto proc_vif_fail;
+ if (!proc_create_net("ip6_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
+ sizeof(struct mr_mfc_iter)))
+ goto proc_cache_fail;
+#endif
+
+ return 0;
+
+#ifdef CONFIG_PROC_FS
+proc_cache_fail:
+ remove_proc_entry("ip6_mr_vif", net->proc_net);
+proc_vif_fail:
+ rtnl_lock();
+ ip6mr_rules_exit(net);
+ rtnl_unlock();
+#endif
+ip6mr_rules_fail:
+ ip6mr_notifier_exit(net);
+ return err;
+}
+
+static void __net_exit ip6mr_net_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry("ip6_mr_cache", net->proc_net);
+ remove_proc_entry("ip6_mr_vif", net->proc_net);
+#endif
+ ip6mr_notifier_exit(net);
+}
+
+static void __net_exit ip6mr_net_exit_batch(struct list_head *net_list)
+{
+ struct net *net;
+
+ rtnl_lock();
+ list_for_each_entry(net, net_list, exit_list)
+ ip6mr_rules_exit(net);
+ rtnl_unlock();
+}
+
+static struct pernet_operations ip6mr_net_ops = {
+ .init = ip6mr_net_init,
+ .exit = ip6mr_net_exit,
+ .exit_batch = ip6mr_net_exit_batch,
+};
+
+int __init ip6_mr_init(void)
+{
+ int err;
+
+ mrt_cachep = kmem_cache_create("ip6_mrt_cache",
+ sizeof(struct mfc6_cache),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (!mrt_cachep)
+ return -ENOMEM;
+
+ err = register_pernet_subsys(&ip6mr_net_ops);
+ if (err)
+ goto reg_pernet_fail;
+
+ err = register_netdevice_notifier(&ip6_mr_notifier);
+ if (err)
+ goto reg_notif_fail;
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
+ pr_err("%s: can't add PIM protocol\n", __func__);
+ err = -EAGAIN;
+ goto add_proto_fail;
+ }
+#endif
+ err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE,
+ ip6mr_rtm_getroute, ip6mr_rtm_dumproute, 0);
+ if (err == 0)
+ return 0;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
+add_proto_fail:
+ unregister_netdevice_notifier(&ip6_mr_notifier);
+#endif
+reg_notif_fail:
+ unregister_pernet_subsys(&ip6mr_net_ops);
+reg_pernet_fail:
+ kmem_cache_destroy(mrt_cachep);
+ return err;
+}
+
+void ip6_mr_cleanup(void)
+{
+ rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
+#ifdef CONFIG_IPV6_PIMSM_V2
+ inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
+#endif
+ unregister_netdevice_notifier(&ip6_mr_notifier);
+ unregister_pernet_subsys(&ip6mr_net_ops);
+ kmem_cache_destroy(mrt_cachep);
+}
+
+static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt,
+ struct mf6cctl *mfc, int mrtsock, int parent)
+{
+ unsigned char ttls[MAXMIFS];
+ struct mfc6_cache *uc, *c;
+ struct mr_mfc *_uc;
+ bool found;
+ int i, err;
+
+ if (mfc->mf6cc_parent >= MAXMIFS)
+ return -ENFILE;
+
+ memset(ttls, 255, MAXMIFS);
+ for (i = 0; i < MAXMIFS; i++) {
+ if (IF_ISSET(i, &mfc->mf6cc_ifset))
+ ttls[i] = 1;
+ }
+
+ /* The entries are added/deleted only under RTNL */
+ rcu_read_lock();
+ c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
+ &mfc->mf6cc_mcastgrp.sin6_addr, parent);
+ rcu_read_unlock();
+ if (c) {
+ spin_lock(&mrt_lock);
+ c->_c.mfc_parent = mfc->mf6cc_parent;
+ ip6mr_update_thresholds(mrt, &c->_c, ttls);
+ if (!mrtsock)
+ c->_c.mfc_flags |= MFC_STATIC;
+ spin_unlock(&mrt_lock);
+ call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE,
+ c, mrt->id);
+ mr6_netlink_event(mrt, c, RTM_NEWROUTE);
+ return 0;
+ }
+
+ if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
+ !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
+ return -EINVAL;
+
+ c = ip6mr_cache_alloc();
+ if (!c)
+ return -ENOMEM;
+
+ c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
+ c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
+ c->_c.mfc_parent = mfc->mf6cc_parent;
+ ip6mr_update_thresholds(mrt, &c->_c, ttls);
+ if (!mrtsock)
+ c->_c.mfc_flags |= MFC_STATIC;
+
+ err = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
+ ip6mr_rht_params);
+ if (err) {
+ pr_err("ip6mr: rhtable insert error %d\n", err);
+ ip6mr_cache_free(c);
+ return err;
+ }
+ list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
+
+ /* Check to see if we resolved a queued list. If so we
+ * need to send on the frames and tidy up.
+ */
+ found = false;
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
+ uc = (struct mfc6_cache *)_uc;
+ if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
+ ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
+ list_del(&_uc->list);
+ atomic_dec(&mrt->cache_resolve_queue_len);
+ found = true;
+ break;
+ }
+ }
+ if (list_empty(&mrt->mfc_unres_queue))
+ del_timer(&mrt->ipmr_expire_timer);
+ spin_unlock_bh(&mfc_unres_lock);
+
+ if (found) {
+ ip6mr_cache_resolve(net, mrt, uc, c);
+ ip6mr_cache_free(uc);
+ }
+ call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
+ c, mrt->id);
+ mr6_netlink_event(mrt, c, RTM_NEWROUTE);
+ return 0;
+}
+
+/*
+ * Close the multicast socket, and clear the vif tables etc
+ */
+
+static void mroute_clean_tables(struct mr_table *mrt, int flags)
+{
+ struct mr_mfc *c, *tmp;
+ LIST_HEAD(list);
+ int i;
+
+ /* Shut down all active vif entries */
+ if (flags & (MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC)) {
+ for (i = 0; i < mrt->maxvif; i++) {
+ if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
+ !(flags & MRT6_FLUSH_MIFS_STATIC)) ||
+ (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT6_FLUSH_MIFS)))
+ continue;
+ mif6_delete(mrt, i, 0, &list);
+ }
+ unregister_netdevice_many(&list);
+ }
+
+ /* Wipe the cache */
+ if (flags & (MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC)) {
+ list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
+ if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC_STATIC)) ||
+ (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC)))
+ continue;
+ rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params);
+ list_del_rcu(&c->list);
+ call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
+ FIB_EVENT_ENTRY_DEL,
+ (struct mfc6_cache *)c, mrt->id);
+ mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
+ mr_cache_put(c);
+ }
+ }
+
+ if (flags & MRT6_FLUSH_MFC) {
+ if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
+ spin_lock_bh(&mfc_unres_lock);
+ list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
+ list_del(&c->list);
+ mr6_netlink_event(mrt, (struct mfc6_cache *)c,
+ RTM_DELROUTE);
+ ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
+ }
+ spin_unlock_bh(&mfc_unres_lock);
+ }
+ }
+}
+
+static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk)
+{
+ int err = 0;
+ struct net *net = sock_net(sk);
+
+ rtnl_lock();
+ spin_lock(&mrt_lock);
+ if (rtnl_dereference(mrt->mroute_sk)) {
+ err = -EADDRINUSE;
+ } else {
+ rcu_assign_pointer(mrt->mroute_sk, sk);
+ sock_set_flag(sk, SOCK_RCU_FREE);
+ atomic_inc(&net->ipv6.devconf_all->mc_forwarding);
+ }
+ spin_unlock(&mrt_lock);
+
+ if (!err)
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_MC_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+ rtnl_unlock();
+
+ return err;
+}
+
+int ip6mr_sk_done(struct sock *sk)
+{
+ struct net *net = sock_net(sk);
+ struct ipv6_devconf *devconf;
+ struct mr_table *mrt;
+ int err = -EACCES;
+
+ if (sk->sk_type != SOCK_RAW ||
+ inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return err;
+
+ devconf = net->ipv6.devconf_all;
+ if (!devconf || !atomic_read(&devconf->mc_forwarding))
+ return err;
+
+ rtnl_lock();
+ ip6mr_for_each_table(mrt, net) {
+ if (sk == rtnl_dereference(mrt->mroute_sk)) {
+ spin_lock(&mrt_lock);
+ RCU_INIT_POINTER(mrt->mroute_sk, NULL);
+ /* Note that mroute_sk had SOCK_RCU_FREE set,
+ * so the RCU grace period before sk freeing
+ * is guaranteed by sk_destruct()
+ */
+ atomic_dec(&devconf->mc_forwarding);
+ spin_unlock(&mrt_lock);
+ inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
+ NETCONFA_MC_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
+
+ mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MFC);
+ err = 0;
+ break;
+ }
+ }
+ rtnl_unlock();
+
+ return err;
+}
+
+bool mroute6_is_socket(struct net *net, struct sk_buff *skb)
+{
+ struct mr_table *mrt;
+ struct flowi6 fl6 = {
+ .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
+ .flowi6_oif = skb->dev->ifindex,
+ .flowi6_mark = skb->mark,
+ };
+
+ if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
+ return NULL;
+
+ return rcu_access_pointer(mrt->mroute_sk);
+}
+EXPORT_SYMBOL(mroute6_is_socket);
+
+/*
+ * Socket options and virtual interface manipulation. The whole
+ * virtual interface system is a complete heap, but unfortunately
+ * that's how BSD mrouted happens to think. Maybe one day with a proper
+ * MOSPF/PIM router set up we can clean this up.
+ */
+
+int ip6_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
+ unsigned int optlen)
+{
+ int ret, parent = 0;
+ struct mif6ctl vif;
+ struct mf6cctl mfc;
+ mifi_t mifi;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ if (sk->sk_type != SOCK_RAW ||
+ inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+
+ mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ if (optname != MRT6_INIT) {
+ if (sk != rcu_access_pointer(mrt->mroute_sk) &&
+ !ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EACCES;
+ }
+
+ switch (optname) {
+ case MRT6_INIT:
+ if (optlen < sizeof(int))
+ return -EINVAL;
+
+ return ip6mr_sk_init(mrt, sk);
+
+ case MRT6_DONE:
+ return ip6mr_sk_done(sk);
+
+ case MRT6_ADD_MIF:
+ if (optlen < sizeof(vif))
+ return -EINVAL;
+ if (copy_from_sockptr(&vif, optval, sizeof(vif)))
+ return -EFAULT;
+ if (vif.mif6c_mifi >= MAXMIFS)
+ return -ENFILE;
+ rtnl_lock();
+ ret = mif6_add(net, mrt, &vif,
+ sk == rtnl_dereference(mrt->mroute_sk));
+ rtnl_unlock();
+ return ret;
+
+ case MRT6_DEL_MIF:
+ if (optlen < sizeof(mifi_t))
+ return -EINVAL;
+ if (copy_from_sockptr(&mifi, optval, sizeof(mifi_t)))
+ return -EFAULT;
+ rtnl_lock();
+ ret = mif6_delete(mrt, mifi, 0, NULL);
+ rtnl_unlock();
+ return ret;
+
+ /*
+ * Manipulate the forwarding caches. These live
+ * in a sort of kernel/user symbiosis.
+ */
+ case MRT6_ADD_MFC:
+ case MRT6_DEL_MFC:
+ parent = -1;
+ fallthrough;
+ case MRT6_ADD_MFC_PROXY:
+ case MRT6_DEL_MFC_PROXY:
+ if (optlen < sizeof(mfc))
+ return -EINVAL;
+ if (copy_from_sockptr(&mfc, optval, sizeof(mfc)))
+ return -EFAULT;
+ if (parent == 0)
+ parent = mfc.mf6cc_parent;
+ rtnl_lock();
+ if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
+ ret = ip6mr_mfc_delete(mrt, &mfc, parent);
+ else
+ ret = ip6mr_mfc_add(net, mrt, &mfc,
+ sk ==
+ rtnl_dereference(mrt->mroute_sk),
+ parent);
+ rtnl_unlock();
+ return ret;
+
+ case MRT6_FLUSH:
+ {
+ int flags;
+
+ if (optlen != sizeof(flags))
+ return -EINVAL;
+ if (copy_from_sockptr(&flags, optval, sizeof(flags)))
+ return -EFAULT;
+ rtnl_lock();
+ mroute_clean_tables(mrt, flags);
+ rtnl_unlock();
+ return 0;
+ }
+
+ /*
+ * Control PIM assert (to activate pim will activate assert)
+ */
+ case MRT6_ASSERT:
+ {
+ int v;
+
+ if (optlen != sizeof(v))
+ return -EINVAL;
+ if (copy_from_sockptr(&v, optval, sizeof(v)))
+ return -EFAULT;
+ mrt->mroute_do_assert = v;
+ return 0;
+ }
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ case MRT6_PIM:
+ {
+ bool do_wrmifwhole;
+ int v;
+
+ if (optlen != sizeof(v))
+ return -EINVAL;
+ if (copy_from_sockptr(&v, optval, sizeof(v)))
+ return -EFAULT;
+
+ do_wrmifwhole = (v == MRT6MSG_WRMIFWHOLE);
+ v = !!v;
+ rtnl_lock();
+ ret = 0;
+ if (v != mrt->mroute_do_pim) {
+ mrt->mroute_do_pim = v;
+ mrt->mroute_do_assert = v;
+ mrt->mroute_do_wrvifwhole = do_wrmifwhole;
+ }
+ rtnl_unlock();
+ return ret;
+ }
+
+#endif
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+ case MRT6_TABLE:
+ {
+ u32 v;
+
+ if (optlen != sizeof(u32))
+ return -EINVAL;
+ if (copy_from_sockptr(&v, optval, sizeof(v)))
+ return -EFAULT;
+ /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
+ if (v != RT_TABLE_DEFAULT && v >= 100000000)
+ return -EINVAL;
+ if (sk == rcu_access_pointer(mrt->mroute_sk))
+ return -EBUSY;
+
+ rtnl_lock();
+ ret = 0;
+ mrt = ip6mr_new_table(net, v);
+ if (IS_ERR(mrt))
+ ret = PTR_ERR(mrt);
+ else
+ raw6_sk(sk)->ip6mr_table = v;
+ rtnl_unlock();
+ return ret;
+ }
+#endif
+ /*
+ * Spurious command, or MRT6_VERSION which you cannot
+ * set.
+ */
+ default:
+ return -ENOPROTOOPT;
+ }
+}
+
+/*
+ * Getsock opt support for the multicast routing system.
+ */
+
+int ip6_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval,
+ sockptr_t optlen)
+{
+ int olr;
+ int val;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ if (sk->sk_type != SOCK_RAW ||
+ inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+
+ mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ switch (optname) {
+ case MRT6_VERSION:
+ val = 0x0305;
+ break;
+#ifdef CONFIG_IPV6_PIMSM_V2
+ case MRT6_PIM:
+ val = mrt->mroute_do_pim;
+ break;
+#endif
+ case MRT6_ASSERT:
+ val = mrt->mroute_do_assert;
+ break;
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ if (copy_from_sockptr(&olr, optlen, sizeof(int)))
+ return -EFAULT;
+
+ olr = min_t(int, olr, sizeof(int));
+ if (olr < 0)
+ return -EINVAL;
+
+ if (copy_to_sockptr(optlen, &olr, sizeof(int)))
+ return -EFAULT;
+ if (copy_to_sockptr(optval, &val, olr))
+ return -EFAULT;
+ return 0;
+}
+
+/*
+ * The IP multicast ioctl support routines.
+ */
+
+int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
+{
+ struct sioc_sg_req6 sr;
+ struct sioc_mif_req6 vr;
+ struct vif_device *vif;
+ struct mfc6_cache *c;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ switch (cmd) {
+ case SIOCGETMIFCNT_IN6:
+ if (copy_from_user(&vr, arg, sizeof(vr)))
+ return -EFAULT;
+ if (vr.mifi >= mrt->maxvif)
+ return -EINVAL;
+ vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
+ rcu_read_lock();
+ vif = &mrt->vif_table[vr.mifi];
+ if (VIF_EXISTS(mrt, vr.mifi)) {
+ vr.icount = READ_ONCE(vif->pkt_in);
+ vr.ocount = READ_ONCE(vif->pkt_out);
+ vr.ibytes = READ_ONCE(vif->bytes_in);
+ vr.obytes = READ_ONCE(vif->bytes_out);
+ rcu_read_unlock();
+
+ if (copy_to_user(arg, &vr, sizeof(vr)))
+ return -EFAULT;
+ return 0;
+ }
+ rcu_read_unlock();
+ return -EADDRNOTAVAIL;
+ case SIOCGETSGCNT_IN6:
+ if (copy_from_user(&sr, arg, sizeof(sr)))
+ return -EFAULT;
+
+ rcu_read_lock();
+ c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
+ if (c) {
+ sr.pktcnt = c->_c.mfc_un.res.pkt;
+ sr.bytecnt = c->_c.mfc_un.res.bytes;
+ sr.wrong_if = c->_c.mfc_un.res.wrong_if;
+ rcu_read_unlock();
+
+ if (copy_to_user(arg, &sr, sizeof(sr)))
+ return -EFAULT;
+ return 0;
+ }
+ rcu_read_unlock();
+ return -EADDRNOTAVAIL;
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_sioc_sg_req6 {
+ struct sockaddr_in6 src;
+ struct sockaddr_in6 grp;
+ compat_ulong_t pktcnt;
+ compat_ulong_t bytecnt;
+ compat_ulong_t wrong_if;
+};
+
+struct compat_sioc_mif_req6 {
+ mifi_t mifi;
+ compat_ulong_t icount;
+ compat_ulong_t ocount;
+ compat_ulong_t ibytes;
+ compat_ulong_t obytes;
+};
+
+int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
+{
+ struct compat_sioc_sg_req6 sr;
+ struct compat_sioc_mif_req6 vr;
+ struct vif_device *vif;
+ struct mfc6_cache *c;
+ struct net *net = sock_net(sk);
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ switch (cmd) {
+ case SIOCGETMIFCNT_IN6:
+ if (copy_from_user(&vr, arg, sizeof(vr)))
+ return -EFAULT;
+ if (vr.mifi >= mrt->maxvif)
+ return -EINVAL;
+ vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
+ rcu_read_lock();
+ vif = &mrt->vif_table[vr.mifi];
+ if (VIF_EXISTS(mrt, vr.mifi)) {
+ vr.icount = READ_ONCE(vif->pkt_in);
+ vr.ocount = READ_ONCE(vif->pkt_out);
+ vr.ibytes = READ_ONCE(vif->bytes_in);
+ vr.obytes = READ_ONCE(vif->bytes_out);
+ rcu_read_unlock();
+
+ if (copy_to_user(arg, &vr, sizeof(vr)))
+ return -EFAULT;
+ return 0;
+ }
+ rcu_read_unlock();
+ return -EADDRNOTAVAIL;
+ case SIOCGETSGCNT_IN6:
+ if (copy_from_user(&sr, arg, sizeof(sr)))
+ return -EFAULT;
+
+ rcu_read_lock();
+ c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
+ if (c) {
+ sr.pktcnt = c->_c.mfc_un.res.pkt;
+ sr.bytecnt = c->_c.mfc_un.res.bytes;
+ sr.wrong_if = c->_c.mfc_un.res.wrong_if;
+ rcu_read_unlock();
+
+ if (copy_to_user(arg, &sr, sizeof(sr)))
+ return -EFAULT;
+ return 0;
+ }
+ rcu_read_unlock();
+ return -EADDRNOTAVAIL;
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+#endif
+
+static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_OUTFORWDATAGRAMS);
+ IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)),
+ IPSTATS_MIB_OUTOCTETS, skb->len);
+ return dst_output(net, sk, skb);
+}
+
+/*
+ * Processing handlers for ip6mr_forward
+ */
+
+static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
+ struct sk_buff *skb, int vifi)
+{
+ struct vif_device *vif = &mrt->vif_table[vifi];
+ struct net_device *vif_dev;
+ struct ipv6hdr *ipv6h;
+ struct dst_entry *dst;
+ struct flowi6 fl6;
+
+ vif_dev = vif_dev_read(vif);
+ if (!vif_dev)
+ goto out_free;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+ if (vif->flags & MIFF_REGISTER) {
+ WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
+ WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
+ vif_dev->stats.tx_bytes += skb->len;
+ vif_dev->stats.tx_packets++;
+ ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
+ goto out_free;
+ }
+#endif
+
+ ipv6h = ipv6_hdr(skb);
+
+ fl6 = (struct flowi6) {
+ .flowi6_oif = vif->link,
+ .daddr = ipv6h->daddr,
+ };
+
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ dst_release(dst);
+ goto out_free;
+ }
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
+
+ /*
+ * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
+ * not only before forwarding, but after forwarding on all output
+ * interfaces. It is clear, if mrouter runs a multicasting
+ * program, it should receive packets not depending to what interface
+ * program is joined.
+ * If we will not make it, the program will have to join on all
+ * interfaces. On the other hand, multihoming host (or router, but
+ * not mrouter) cannot join to more than one interface - it will
+ * result in receiving multiple packets.
+ */
+ skb->dev = vif_dev;
+ WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
+ WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
+
+ /* We are about to write */
+ /* XXX: extension headers? */
+ if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(vif_dev)))
+ goto out_free;
+
+ ipv6h = ipv6_hdr(skb);
+ ipv6h->hop_limit--;
+
+ IP6CB(skb)->flags |= IP6SKB_FORWARDED;
+
+ return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
+ net, NULL, skb, skb->dev, vif_dev,
+ ip6mr_forward2_finish);
+
+out_free:
+ kfree_skb(skb);
+ return 0;
+}
+
+/* Called with rcu_read_lock() */
+static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev)
+{
+ int ct;
+
+ /* Pairs with WRITE_ONCE() in mif6_delete()/mif6_add() */
+ for (ct = READ_ONCE(mrt->maxvif) - 1; ct >= 0; ct--) {
+ if (rcu_access_pointer(mrt->vif_table[ct].dev) == dev)
+ break;
+ }
+ return ct;
+}
+
+/* Called under rcu_read_lock() */
+static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
+ struct net_device *dev, struct sk_buff *skb,
+ struct mfc6_cache *c)
+{
+ int psend = -1;
+ int vif, ct;
+ int true_vifi = ip6mr_find_vif(mrt, dev);
+
+ vif = c->_c.mfc_parent;
+ c->_c.mfc_un.res.pkt++;
+ c->_c.mfc_un.res.bytes += skb->len;
+ c->_c.mfc_un.res.lastuse = jiffies;
+
+ if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) {
+ struct mfc6_cache *cache_proxy;
+
+ /* For an (*,G) entry, we only check that the incoming
+ * interface is part of the static tree.
+ */
+ 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 (rcu_access_pointer(mrt->vif_table[vif].dev) != dev) {
+ c->_c.mfc_un.res.wrong_if++;
+
+ if (true_vifi >= 0 && mrt->mroute_do_assert &&
+ /* pimsm uses asserts, when switching from RPT to SPT,
+ so that we cannot check that packet arrived on an oif.
+ It is bad, but otherwise we would need to move pretty
+ large chunk of pimd to kernel. Ough... --ANK
+ */
+ (mrt->mroute_do_pim ||
+ c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
+ time_after(jiffies,
+ c->_c.mfc_un.res.last_assert +
+ MFC_ASSERT_THRESH)) {
+ c->_c.mfc_un.res.last_assert = jiffies;
+ ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
+ if (mrt->mroute_do_wrvifwhole)
+ ip6mr_cache_report(mrt, skb, true_vifi,
+ MRT6MSG_WRMIFWHOLE);
+ }
+ goto dont_forward;
+ }
+
+forward:
+ WRITE_ONCE(mrt->vif_table[vif].pkt_in,
+ mrt->vif_table[vif].pkt_in + 1);
+ WRITE_ONCE(mrt->vif_table[vif].bytes_in,
+ mrt->vif_table[vif].bytes_in + skb->len);
+
+ /*
+ * Forward the frame
+ */
+ if (ipv6_addr_any(&c->mf6c_origin) &&
+ ipv6_addr_any(&c->mf6c_mcastgrp)) {
+ if (true_vifi >= 0 &&
+ true_vifi != c->_c.mfc_parent &&
+ ipv6_hdr(skb)->hop_limit >
+ c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
+ /* It's an (*,*) entry and the packet is not coming from
+ * the upstream: forward the packet to the upstream
+ * only.
+ */
+ psend = c->_c.mfc_parent;
+ goto last_forward;
+ }
+ goto dont_forward;
+ }
+ for (ct = c->_c.mfc_un.res.maxvif - 1;
+ ct >= c->_c.mfc_un.res.minvif; ct--) {
+ /* For (*,G) entry, don't forward to the incoming interface */
+ if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) &&
+ ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) {
+ if (psend != -1) {
+ struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (skb2)
+ ip6mr_forward2(net, mrt, skb2, psend);
+ }
+ psend = ct;
+ }
+ }
+last_forward:
+ if (psend != -1) {
+ ip6mr_forward2(net, mrt, skb, psend);
+ return;
+ }
+
+dont_forward:
+ kfree_skb(skb);
+}
+
+
+/*
+ * Multicast packets for forwarding arrive here
+ */
+
+int ip6_mr_input(struct sk_buff *skb)
+{
+ struct mfc6_cache *cache;
+ struct net *net = dev_net(skb->dev);
+ struct mr_table *mrt;
+ struct flowi6 fl6 = {
+ .flowi6_iif = skb->dev->ifindex,
+ .flowi6_mark = skb->mark,
+ };
+ int err;
+ struct net_device *dev;
+
+ /* skb->dev passed in is the master dev for vrfs.
+ * Get the proper interface that does have a vif associated with it.
+ */
+ dev = skb->dev;
+ if (netif_is_l3_master(skb->dev)) {
+ dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
+ if (!dev) {
+ kfree_skb(skb);
+ return -ENODEV;
+ }
+ }
+
+ err = ip6mr_fib_lookup(net, &fl6, &mrt);
+ if (err < 0) {
+ kfree_skb(skb);
+ return err;
+ }
+
+ cache = ip6mr_cache_find(mrt,
+ &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
+ if (!cache) {
+ int vif = ip6mr_find_vif(mrt, dev);
+
+ if (vif >= 0)
+ cache = ip6mr_cache_find_any(mrt,
+ &ipv6_hdr(skb)->daddr,
+ vif);
+ }
+
+ /*
+ * No usable cache entry
+ */
+ if (!cache) {
+ int vif;
+
+ vif = ip6mr_find_vif(mrt, dev);
+ if (vif >= 0) {
+ int err = ip6mr_cache_unresolved(mrt, vif, skb, dev);
+
+ return err;
+ }
+ kfree_skb(skb);
+ return -ENODEV;
+ }
+
+ ip6_mr_forward(net, mrt, dev, skb, cache);
+
+ return 0;
+}
+
+int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
+ u32 portid)
+{
+ int err;
+ struct mr_table *mrt;
+ struct mfc6_cache *cache;
+ struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
+
+ mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+ if (!mrt)
+ return -ENOENT;
+
+ rcu_read_lock();
+ cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
+ if (!cache && skb->dev) {
+ int vif = ip6mr_find_vif(mrt, skb->dev);
+
+ if (vif >= 0)
+ cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
+ vif);
+ }
+
+ if (!cache) {
+ struct sk_buff *skb2;
+ struct ipv6hdr *iph;
+ struct net_device *dev;
+ int vif;
+
+ dev = skb->dev;
+ if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+
+ /* really correct? */
+ skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
+ if (!skb2) {
+ rcu_read_unlock();
+ return -ENOMEM;
+ }
+
+ NETLINK_CB(skb2).portid = portid;
+ skb_reset_transport_header(skb2);
+
+ skb_put(skb2, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb2);
+
+ iph = ipv6_hdr(skb2);
+ iph->version = 0;
+ iph->priority = 0;
+ iph->flow_lbl[0] = 0;
+ iph->flow_lbl[1] = 0;
+ iph->flow_lbl[2] = 0;
+ iph->payload_len = 0;
+ iph->nexthdr = IPPROTO_NONE;
+ iph->hop_limit = 0;
+ iph->saddr = rt->rt6i_src.addr;
+ iph->daddr = rt->rt6i_dst.addr;
+
+ err = ip6mr_cache_unresolved(mrt, vif, skb2, dev);
+ rcu_read_unlock();
+
+ return err;
+ }
+
+ err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
+ rcu_read_unlock();
+ return err;
+}
+
+static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
+ u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
+ int flags)
+{
+ struct nlmsghdr *nlh;
+ struct rtmsg *rtm;
+ int err;
+
+ nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ rtm = nlmsg_data(nlh);
+ rtm->rtm_family = RTNL_FAMILY_IP6MR;
+ rtm->rtm_dst_len = 128;
+ rtm->rtm_src_len = 128;
+ rtm->rtm_tos = 0;
+ rtm->rtm_table = mrt->id;
+ if (nla_put_u32(skb, RTA_TABLE, mrt->id))
+ goto nla_put_failure;
+ rtm->rtm_type = RTN_MULTICAST;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ if (c->_c.mfc_flags & MFC_STATIC)
+ rtm->rtm_protocol = RTPROT_STATIC;
+ else
+ rtm->rtm_protocol = RTPROT_MROUTED;
+ rtm->rtm_flags = 0;
+
+ if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
+ nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
+ goto nla_put_failure;
+ err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
+ /* do not break the dump if cache is unresolved */
+ if (err < 0 && err != -ENOENT)
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
+ u32 portid, u32 seq, struct mr_mfc *c,
+ int cmd, int flags)
+{
+ return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c,
+ cmd, flags);
+}
+
+static int mr6_msgsize(bool unresolved, int maxvif)
+{
+ size_t len =
+ NLMSG_ALIGN(sizeof(struct rtmsg))
+ + nla_total_size(4) /* RTA_TABLE */
+ + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
+ + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
+ ;
+
+ if (!unresolved)
+ len = len
+ + nla_total_size(4) /* RTA_IIF */
+ + nla_total_size(0) /* RTA_MULTIPATH */
+ + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
+ /* RTA_MFC_STATS */
+ + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
+ ;
+
+ return len;
+}
+
+static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
+ int cmd)
+{
+ struct net *net = read_pnet(&mrt->net);
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif),
+ GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
+ if (err < 0)
+ goto errout;
+
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
+ return;
+
+errout:
+ kfree_skb(skb);
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
+}
+
+static size_t mrt6msg_netlink_msgsize(size_t payloadlen)
+{
+ size_t len =
+ NLMSG_ALIGN(sizeof(struct rtgenmsg))
+ + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */
+ + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */
+ /* IP6MRA_CREPORT_SRC_ADDR */
+ + nla_total_size(sizeof(struct in6_addr))
+ /* IP6MRA_CREPORT_DST_ADDR */
+ + nla_total_size(sizeof(struct in6_addr))
+ /* IP6MRA_CREPORT_PKT */
+ + nla_total_size(payloadlen)
+ ;
+
+ return len;
+}
+
+static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt)
+{
+ struct net *net = read_pnet(&mrt->net);
+ struct nlmsghdr *nlh;
+ struct rtgenmsg *rtgenm;
+ struct mrt6msg *msg;
+ struct sk_buff *skb;
+ struct nlattr *nla;
+ int payloadlen;
+
+ payloadlen = pkt->len - sizeof(struct mrt6msg);
+ msg = (struct mrt6msg *)skb_transport_header(pkt);
+
+ skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC);
+ if (!skb)
+ goto errout;
+
+ nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
+ sizeof(struct rtgenmsg), 0);
+ if (!nlh)
+ goto errout;
+ rtgenm = nlmsg_data(nlh);
+ rtgenm->rtgen_family = RTNL_FAMILY_IP6MR;
+ if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) ||
+ nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) ||
+ nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR,
+ &msg->im6_src) ||
+ nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR,
+ &msg->im6_dst))
+ goto nla_put_failure;
+
+ nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen);
+ if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg),
+ nla_data(nla), payloadlen))
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC);
+ return;
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+errout:
+ kfree_skb(skb);
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS);
+}
+
+static const struct nla_policy ip6mr_getroute_policy[RTA_MAX + 1] = {
+ [RTA_SRC] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
+ [RTA_DST] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
+ [RTA_TABLE] = { .type = NLA_U32 },
+};
+
+static int ip6mr_rtm_valid_getroute_req(struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ struct nlattr **tb,
+ struct netlink_ext_ack *extack)
+{
+ struct rtmsg *rtm;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, ip6mr_getroute_policy,
+ extack);
+ if (err)
+ return err;
+
+ rtm = nlmsg_data(nlh);
+ if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
+ (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
+ rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
+ rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Invalid values in header for multicast route get request");
+ return -EINVAL;
+ }
+
+ if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
+ (tb[RTA_DST] && !rtm->rtm_dst_len)) {
+ NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct in6_addr src = {}, grp = {};
+ struct nlattr *tb[RTA_MAX + 1];
+ struct mfc6_cache *cache;
+ struct mr_table *mrt;
+ struct sk_buff *skb;
+ u32 tableid;
+ int err;
+
+ err = ip6mr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
+ if (err < 0)
+ return err;
+
+ if (tb[RTA_SRC])
+ src = nla_get_in6_addr(tb[RTA_SRC]);
+ if (tb[RTA_DST])
+ grp = nla_get_in6_addr(tb[RTA_DST]);
+ tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
+
+ mrt = ip6mr_get_table(net, tableid ?: RT_TABLE_DEFAULT);
+ if (!mrt) {
+ NL_SET_ERR_MSG_MOD(extack, "MR table does not exist");
+ return -ENOENT;
+ }
+
+ /* entries are added/deleted only under RTNL */
+ rcu_read_lock();
+ cache = ip6mr_cache_find(mrt, &src, &grp);
+ rcu_read_unlock();
+ if (!cache) {
+ NL_SET_ERR_MSG_MOD(extack, "MR cache entry not found");
+ return -ENOENT;
+ }
+
+ skb = nlmsg_new(mr6_msgsize(false, mrt->maxvif), GFP_KERNEL);
+ if (!skb)
+ return -ENOBUFS;
+
+ err = ip6mr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, cache, RTM_NEWROUTE, 0);
+ if (err < 0) {
+ kfree_skb(skb);
+ return err;
+ }
+
+ return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+}
+
+static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ const struct nlmsghdr *nlh = cb->nlh;
+ struct fib_dump_filter filter = {};
+ int err;
+
+ if (cb->strict_check) {
+ err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh,
+ &filter, cb);
+ if (err < 0)
+ return err;
+ }
+
+ if (filter.table_id) {
+ struct mr_table *mrt;
+
+ mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id);
+ if (!mrt) {
+ if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IP6MR)
+ return skb->len;
+
+ NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist");
+ return -ENOENT;
+ }
+ err = mr_table_dump(mrt, skb, cb, _ip6mr_fill_mroute,
+ &mfc_unres_lock, &filter);
+ return skb->len ? : err;
+ }
+
+ return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter,
+ _ip6mr_fill_mroute, &mfc_unres_lock, &filter);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 13:04:23 +0000