3184 lines
77 KiB
C
3184 lines
77 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IP multicast routing support for mrouted 3.6/3.8
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*
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* (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk>
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* Linux Consultancy and Custom Driver Development
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*
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* Fixes:
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* Michael Chastain : Incorrect size of copying.
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* Alan Cox : Added the cache manager code
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* Alan Cox : Fixed the clone/copy bug and device race.
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* Mike McLagan : Routing by source
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* Malcolm Beattie : Buffer handling fixes.
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* Alexey Kuznetsov : Double buffer free and other fixes.
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* SVR Anand : Fixed several multicast bugs and problems.
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* Alexey Kuznetsov : Status, optimisations and more.
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* Brad Parker : Better behaviour on mrouted upcall
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* overflow.
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* Carlos Picoto : PIMv1 Support
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* Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header
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* Relax this requirement to work with older peers.
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*/
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#include <linux/uaccess.h>
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#include <linux/types.h>
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#include <linux/cache.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/igmp.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/mroute.h>
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#include <linux/init.h>
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#include <linux/if_ether.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <net/route.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/raw.h>
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#include <linux/notifier.h>
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#include <linux/if_arp.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/compat.h>
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#include <linux/export.h>
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#include <linux/rhashtable.h>
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#include <net/ip_tunnels.h>
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#include <net/checksum.h>
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#include <net/netlink.h>
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#include <net/fib_rules.h>
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#include <linux/netconf.h>
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#include <net/rtnh.h>
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#include <linux/nospec.h>
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struct ipmr_rule {
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struct fib_rule common;
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};
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struct ipmr_result {
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struct mr_table *mrt;
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};
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/* Big lock, protecting vif table, mrt cache and mroute socket state.
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* Note that the changes are semaphored via rtnl_lock.
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*/
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static DEFINE_SPINLOCK(mrt_lock);
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static struct net_device *vif_dev_read(const struct vif_device *vif)
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{
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return rcu_dereference(vif->dev);
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}
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/* Multicast router control variables */
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/* Special spinlock for queue of unresolved entries */
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static DEFINE_SPINLOCK(mfc_unres_lock);
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/* We return to original Alan's scheme. Hash table of resolved
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* entries is changed only in process context and protected
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* with weak lock mrt_lock. Queue of unresolved entries is protected
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* with strong spinlock mfc_unres_lock.
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*
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* In this case data path is free of exclusive locks at all.
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*/
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static struct kmem_cache *mrt_cachep __ro_after_init;
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static struct mr_table *ipmr_new_table(struct net *net, u32 id);
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static void ipmr_free_table(struct mr_table *mrt);
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static void ip_mr_forward(struct net *net, struct mr_table *mrt,
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struct net_device *dev, struct sk_buff *skb,
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struct mfc_cache *cache, int local);
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static int ipmr_cache_report(const struct mr_table *mrt,
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struct sk_buff *pkt, vifi_t vifi, int assert);
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static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
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int cmd);
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static void igmpmsg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt);
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static void mroute_clean_tables(struct mr_table *mrt, int flags);
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static void ipmr_expire_process(struct timer_list *t);
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#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
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#define ipmr_for_each_table(mrt, net) \
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list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list, \
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lockdep_rtnl_is_held() || \
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list_empty(&net->ipv4.mr_tables))
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static struct mr_table *ipmr_mr_table_iter(struct net *net,
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struct mr_table *mrt)
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{
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struct mr_table *ret;
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if (!mrt)
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ret = list_entry_rcu(net->ipv4.mr_tables.next,
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struct mr_table, list);
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else
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ret = list_entry_rcu(mrt->list.next,
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struct mr_table, list);
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if (&ret->list == &net->ipv4.mr_tables)
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return NULL;
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return ret;
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}
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static struct mr_table *ipmr_get_table(struct net *net, u32 id)
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{
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struct mr_table *mrt;
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ipmr_for_each_table(mrt, net) {
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if (mrt->id == id)
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return mrt;
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}
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return NULL;
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}
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static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
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struct mr_table **mrt)
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{
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int err;
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struct ipmr_result res;
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struct fib_lookup_arg arg = {
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.result = &res,
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.flags = FIB_LOOKUP_NOREF,
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};
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/* update flow if oif or iif point to device enslaved to l3mdev */
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l3mdev_update_flow(net, flowi4_to_flowi(flp4));
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err = fib_rules_lookup(net->ipv4.mr_rules_ops,
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flowi4_to_flowi(flp4), 0, &arg);
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if (err < 0)
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return err;
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*mrt = res.mrt;
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return 0;
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}
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static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
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int flags, struct fib_lookup_arg *arg)
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{
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struct ipmr_result *res = arg->result;
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struct mr_table *mrt;
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switch (rule->action) {
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case FR_ACT_TO_TBL:
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break;
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case FR_ACT_UNREACHABLE:
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return -ENETUNREACH;
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case FR_ACT_PROHIBIT:
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return -EACCES;
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case FR_ACT_BLACKHOLE:
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default:
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return -EINVAL;
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}
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arg->table = fib_rule_get_table(rule, arg);
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mrt = ipmr_get_table(rule->fr_net, arg->table);
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if (!mrt)
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return -EAGAIN;
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res->mrt = mrt;
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return 0;
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}
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static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
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{
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return 1;
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}
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static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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struct fib_rule_hdr *frh, struct nlattr **tb,
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struct netlink_ext_ack *extack)
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{
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return 0;
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}
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static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
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struct nlattr **tb)
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{
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return 1;
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}
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static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
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struct fib_rule_hdr *frh)
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{
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frh->dst_len = 0;
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frh->src_len = 0;
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frh->tos = 0;
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return 0;
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}
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static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
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.family = RTNL_FAMILY_IPMR,
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.rule_size = sizeof(struct ipmr_rule),
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.addr_size = sizeof(u32),
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.action = ipmr_rule_action,
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.match = ipmr_rule_match,
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.configure = ipmr_rule_configure,
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.compare = ipmr_rule_compare,
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.fill = ipmr_rule_fill,
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.nlgroup = RTNLGRP_IPV4_RULE,
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.owner = THIS_MODULE,
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};
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static int __net_init ipmr_rules_init(struct net *net)
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{
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struct fib_rules_ops *ops;
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struct mr_table *mrt;
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int err;
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ops = fib_rules_register(&ipmr_rules_ops_template, net);
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if (IS_ERR(ops))
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return PTR_ERR(ops);
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INIT_LIST_HEAD(&net->ipv4.mr_tables);
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mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
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if (IS_ERR(mrt)) {
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err = PTR_ERR(mrt);
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goto err1;
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}
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err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
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if (err < 0)
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goto err2;
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net->ipv4.mr_rules_ops = ops;
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return 0;
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err2:
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rtnl_lock();
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ipmr_free_table(mrt);
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rtnl_unlock();
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err1:
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fib_rules_unregister(ops);
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return err;
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}
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static void __net_exit ipmr_rules_exit(struct net *net)
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{
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struct mr_table *mrt, *next;
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ASSERT_RTNL();
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list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
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list_del(&mrt->list);
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ipmr_free_table(mrt);
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}
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fib_rules_unregister(net->ipv4.mr_rules_ops);
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}
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static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
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struct netlink_ext_ack *extack)
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{
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return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack);
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}
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static unsigned int ipmr_rules_seq_read(struct net *net)
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{
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return fib_rules_seq_read(net, RTNL_FAMILY_IPMR);
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}
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bool ipmr_rule_default(const struct fib_rule *rule)
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{
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return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;
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}
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EXPORT_SYMBOL(ipmr_rule_default);
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#else
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#define ipmr_for_each_table(mrt, net) \
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for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
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static struct mr_table *ipmr_mr_table_iter(struct net *net,
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struct mr_table *mrt)
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{
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if (!mrt)
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return net->ipv4.mrt;
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return NULL;
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}
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static struct mr_table *ipmr_get_table(struct net *net, u32 id)
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{
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return net->ipv4.mrt;
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}
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static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
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struct mr_table **mrt)
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{
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*mrt = net->ipv4.mrt;
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return 0;
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}
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static int __net_init ipmr_rules_init(struct net *net)
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{
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struct mr_table *mrt;
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mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
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if (IS_ERR(mrt))
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return PTR_ERR(mrt);
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net->ipv4.mrt = mrt;
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return 0;
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}
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static void __net_exit ipmr_rules_exit(struct net *net)
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{
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ASSERT_RTNL();
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ipmr_free_table(net->ipv4.mrt);
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net->ipv4.mrt = NULL;
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}
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static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
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struct netlink_ext_ack *extack)
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{
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return 0;
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}
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static unsigned int ipmr_rules_seq_read(struct net *net)
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{
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return 0;
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}
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bool ipmr_rule_default(const struct fib_rule *rule)
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{
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return true;
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}
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EXPORT_SYMBOL(ipmr_rule_default);
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#endif
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static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg,
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const void *ptr)
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{
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const struct mfc_cache_cmp_arg *cmparg = arg->key;
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const struct mfc_cache *c = ptr;
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return cmparg->mfc_mcastgrp != c->mfc_mcastgrp ||
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cmparg->mfc_origin != c->mfc_origin;
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}
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static const struct rhashtable_params ipmr_rht_params = {
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.head_offset = offsetof(struct mr_mfc, mnode),
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.key_offset = offsetof(struct mfc_cache, cmparg),
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.key_len = sizeof(struct mfc_cache_cmp_arg),
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.nelem_hint = 3,
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.obj_cmpfn = ipmr_hash_cmp,
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.automatic_shrinking = true,
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};
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static void ipmr_new_table_set(struct mr_table *mrt,
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struct net *net)
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{
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#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
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list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
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#endif
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}
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static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = {
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.mfc_mcastgrp = htonl(INADDR_ANY),
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.mfc_origin = htonl(INADDR_ANY),
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};
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static struct mr_table_ops ipmr_mr_table_ops = {
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.rht_params = &ipmr_rht_params,
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.cmparg_any = &ipmr_mr_table_ops_cmparg_any,
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};
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static struct mr_table *ipmr_new_table(struct net *net, u32 id)
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{
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struct mr_table *mrt;
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/* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
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if (id != RT_TABLE_DEFAULT && id >= 1000000000)
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return ERR_PTR(-EINVAL);
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mrt = ipmr_get_table(net, id);
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if (mrt)
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return mrt;
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return mr_table_alloc(net, id, &ipmr_mr_table_ops,
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ipmr_expire_process, ipmr_new_table_set);
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}
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static void ipmr_free_table(struct mr_table *mrt)
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{
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timer_shutdown_sync(&mrt->ipmr_expire_timer);
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mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC |
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MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC);
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rhltable_destroy(&mrt->mfc_hash);
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kfree(mrt);
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}
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|
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/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
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|
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/* Initialize ipmr pimreg/tunnel in_device */
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static bool ipmr_init_vif_indev(const struct net_device *dev)
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{
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struct in_device *in_dev;
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ASSERT_RTNL();
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in_dev = __in_dev_get_rtnl(dev);
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if (!in_dev)
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return false;
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ipv4_devconf_setall(in_dev);
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neigh_parms_data_state_setall(in_dev->arp_parms);
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IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
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|
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return true;
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}
|
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|
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static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
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{
|
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struct net_device *tunnel_dev, *new_dev;
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struct ip_tunnel_parm p = { };
|
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int err;
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|
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tunnel_dev = __dev_get_by_name(net, "tunl0");
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if (!tunnel_dev)
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goto out;
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p.iph.daddr = v->vifc_rmt_addr.s_addr;
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p.iph.saddr = v->vifc_lcl_addr.s_addr;
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p.iph.version = 4;
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p.iph.ihl = 5;
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p.iph.protocol = IPPROTO_IPIP;
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sprintf(p.name, "dvmrp%d", v->vifc_vifi);
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|
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if (!tunnel_dev->netdev_ops->ndo_tunnel_ctl)
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goto out;
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err = tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p,
|
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SIOCADDTUNNEL);
|
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if (err)
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goto out;
|
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|
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new_dev = __dev_get_by_name(net, p.name);
|
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if (!new_dev)
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goto out;
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|
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new_dev->flags |= IFF_MULTICAST;
|
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if (!ipmr_init_vif_indev(new_dev))
|
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goto out_unregister;
|
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if (dev_open(new_dev, NULL))
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goto out_unregister;
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dev_hold(new_dev);
|
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err = dev_set_allmulti(new_dev, 1);
|
|
if (err) {
|
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dev_close(new_dev);
|
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tunnel_dev->netdev_ops->ndo_tunnel_ctl(tunnel_dev, &p,
|
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SIOCDELTUNNEL);
|
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dev_put(new_dev);
|
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new_dev = ERR_PTR(err);
|
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}
|
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return new_dev;
|
|
|
|
out_unregister:
|
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unregister_netdevice(new_dev);
|
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out:
|
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return ERR_PTR(-ENOBUFS);
|
|
}
|
|
|
|
#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
|
|
static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct mr_table *mrt;
|
|
struct flowi4 fl4 = {
|
|
.flowi4_oif = dev->ifindex,
|
|
.flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
|
|
.flowi4_mark = skb->mark,
|
|
};
|
|
int err;
|
|
|
|
err = ipmr_fib_lookup(net, &fl4, &mrt);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
DEV_STATS_ADD(dev, tx_bytes, skb->len);
|
|
DEV_STATS_INC(dev, tx_packets);
|
|
rcu_read_lock();
|
|
|
|
/* Pairs with WRITE_ONCE() in vif_add() and vif_delete() */
|
|
ipmr_cache_report(mrt, skb, READ_ONCE(mrt->mroute_reg_vif_num),
|
|
IGMPMSG_WHOLEPKT);
|
|
|
|
rcu_read_unlock();
|
|
kfree_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static int reg_vif_get_iflink(const struct net_device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops reg_vif_netdev_ops = {
|
|
.ndo_start_xmit = reg_vif_xmit,
|
|
.ndo_get_iflink = reg_vif_get_iflink,
|
|
};
|
|
|
|
static void reg_vif_setup(struct net_device *dev)
|
|
{
|
|
dev->type = ARPHRD_PIMREG;
|
|
dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
|
|
dev->flags = IFF_NOARP;
|
|
dev->netdev_ops = ®_vif_netdev_ops;
|
|
dev->needs_free_netdev = true;
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
}
|
|
|
|
static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
|
|
{
|
|
struct net_device *dev;
|
|
char name[IFNAMSIZ];
|
|
|
|
if (mrt->id == RT_TABLE_DEFAULT)
|
|
sprintf(name, "pimreg");
|
|
else
|
|
sprintf(name, "pimreg%u", mrt->id);
|
|
|
|
dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
|
|
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
dev_net_set(dev, net);
|
|
|
|
if (register_netdevice(dev)) {
|
|
free_netdev(dev);
|
|
return NULL;
|
|
}
|
|
|
|
if (!ipmr_init_vif_indev(dev))
|
|
goto failure;
|
|
if (dev_open(dev, NULL))
|
|
goto failure;
|
|
|
|
dev_hold(dev);
|
|
|
|
return dev;
|
|
|
|
failure:
|
|
unregister_netdevice(dev);
|
|
return NULL;
|
|
}
|
|
|
|
/* called with rcu_read_lock() */
|
|
static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
|
|
unsigned int pimlen)
|
|
{
|
|
struct net_device *reg_dev = NULL;
|
|
struct iphdr *encap;
|
|
int vif_num;
|
|
|
|
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;
|
|
|
|
/* Pairs with WRITE_ONCE() in vif_add()/vid_delete() */
|
|
vif_num = READ_ONCE(mrt->mroute_reg_vif_num);
|
|
if (vif_num >= 0)
|
|
reg_dev = vif_dev_read(&mrt->vif_table[vif_num]);
|
|
if (!reg_dev)
|
|
return 1;
|
|
|
|
skb->mac_header = skb->network_header;
|
|
skb_pull(skb, (u8 *)encap - skb->data);
|
|
skb_reset_network_header(skb);
|
|
skb->protocol = htons(ETH_P_IP);
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
|
|
|
|
netif_rx(skb);
|
|
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
#else
|
|
static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
static int call_ipmr_vif_entry_notifiers(struct net *net,
|
|
enum fib_event_type event_type,
|
|
struct vif_device *vif,
|
|
struct net_device *vif_dev,
|
|
vifi_t vif_index, u32 tb_id)
|
|
{
|
|
return mr_call_vif_notifiers(net, RTNL_FAMILY_IPMR, event_type,
|
|
vif, vif_dev, vif_index, tb_id,
|
|
&net->ipv4.ipmr_seq);
|
|
}
|
|
|
|
static int call_ipmr_mfc_entry_notifiers(struct net *net,
|
|
enum fib_event_type event_type,
|
|
struct mfc_cache *mfc, u32 tb_id)
|
|
{
|
|
return mr_call_mfc_notifiers(net, RTNL_FAMILY_IPMR, event_type,
|
|
&mfc->_c, tb_id, &net->ipv4.ipmr_seq);
|
|
}
|
|
|
|
/**
|
|
* vif_delete - Delete a VIF entry
|
|
* @mrt: Table to delete from
|
|
* @vifi: VIF identifier to delete
|
|
* @notify: Set to 1, if the caller is a notifier_call
|
|
* @head: if unregistering the VIF, place it on this queue
|
|
*/
|
|
static int vif_delete(struct mr_table *mrt, int vifi, int notify,
|
|
struct list_head *head)
|
|
{
|
|
struct net *net = read_pnet(&mrt->net);
|
|
struct vif_device *v;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
|
|
if (vifi < 0 || vifi >= mrt->maxvif)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
v = &mrt->vif_table[vifi];
|
|
|
|
dev = rtnl_dereference(v->dev);
|
|
if (!dev)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
spin_lock(&mrt_lock);
|
|
call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_DEL, v, dev,
|
|
vifi, mrt->id);
|
|
RCU_INIT_POINTER(v->dev, NULL);
|
|
|
|
if (vifi == mrt->mroute_reg_vif_num) {
|
|
/* Pairs with READ_ONCE() in ipmr_cache_report() and reg_vif_xmit() */
|
|
WRITE_ONCE(mrt->mroute_reg_vif_num, -1);
|
|
}
|
|
if (vifi + 1 == mrt->maxvif) {
|
|
int tmp;
|
|
|
|
for (tmp = vifi - 1; tmp >= 0; tmp--) {
|
|
if (VIF_EXISTS(mrt, tmp))
|
|
break;
|
|
}
|
|
WRITE_ONCE(mrt->maxvif, tmp + 1);
|
|
}
|
|
|
|
spin_unlock(&mrt_lock);
|
|
|
|
dev_set_allmulti(dev, -1);
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (in_dev) {
|
|
IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
|
|
inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
|
|
NETCONFA_MC_FORWARDING,
|
|
dev->ifindex, &in_dev->cnf);
|
|
ip_rt_multicast_event(in_dev);
|
|
}
|
|
|
|
if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
|
|
unregister_netdevice_queue(dev, head);
|
|
|
|
netdev_put(dev, &v->dev_tracker);
|
|
return 0;
|
|
}
|
|
|
|
static void ipmr_cache_free_rcu(struct rcu_head *head)
|
|
{
|
|
struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
|
|
|
|
kmem_cache_free(mrt_cachep, (struct mfc_cache *)c);
|
|
}
|
|
|
|
static void ipmr_cache_free(struct mfc_cache *c)
|
|
{
|
|
call_rcu(&c->_c.rcu, ipmr_cache_free_rcu);
|
|
}
|
|
|
|
/* Destroy an unresolved cache entry, killing queued skbs
|
|
* and reporting error to netlink readers.
|
|
*/
|
|
static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
|
|
{
|
|
struct net *net = read_pnet(&mrt->net);
|
|
struct sk_buff *skb;
|
|
struct nlmsgerr *e;
|
|
|
|
atomic_dec(&mrt->cache_resolve_queue_len);
|
|
|
|
while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved))) {
|
|
if (ip_hdr(skb)->version == 0) {
|
|
struct nlmsghdr *nlh = skb_pull(skb,
|
|
sizeof(struct iphdr));
|
|
nlh->nlmsg_type = NLMSG_ERROR;
|
|
nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
|
|
skb_trim(skb, nlh->nlmsg_len);
|
|
e = nlmsg_data(nlh);
|
|
e->error = -ETIMEDOUT;
|
|
memset(&e->msg, 0, sizeof(e->msg));
|
|
|
|
rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
|
|
} else {
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
ipmr_cache_free(c);
|
|
}
|
|
|
|
/* Timer process for the unresolved queue. */
|
|
static void ipmr_expire_process(struct timer_list *t)
|
|
{
|
|
struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
|
|
struct mr_mfc *c, *next;
|
|
unsigned long expires;
|
|
unsigned long now;
|
|
|
|
if (!spin_trylock(&mfc_unres_lock)) {
|
|
mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
|
|
return;
|
|
}
|
|
|
|
if (list_empty(&mrt->mfc_unres_queue))
|
|
goto out;
|
|
|
|
now = jiffies;
|
|
expires = 10*HZ;
|
|
|
|
list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
|
|
if (time_after(c->mfc_un.unres.expires, now)) {
|
|
unsigned long interval = c->mfc_un.unres.expires - now;
|
|
if (interval < expires)
|
|
expires = interval;
|
|
continue;
|
|
}
|
|
|
|
list_del(&c->list);
|
|
mroute_netlink_event(mrt, (struct mfc_cache *)c, RTM_DELROUTE);
|
|
ipmr_destroy_unres(mrt, (struct mfc_cache *)c);
|
|
}
|
|
|
|
if (!list_empty(&mrt->mfc_unres_queue))
|
|
mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
|
|
|
|
out:
|
|
spin_unlock(&mfc_unres_lock);
|
|
}
|
|
|
|
/* Fill oifs list. It is called under locked mrt_lock. */
|
|
static void ipmr_update_thresholds(struct mr_table *mrt, struct mr_mfc *cache,
|
|
unsigned char *ttls)
|
|
{
|
|
int vifi;
|
|
|
|
cache->mfc_un.res.minvif = MAXVIFS;
|
|
cache->mfc_un.res.maxvif = 0;
|
|
memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
|
|
|
|
for (vifi = 0; vifi < mrt->maxvif; vifi++) {
|
|
if (VIF_EXISTS(mrt, vifi) &&
|
|
ttls[vifi] && ttls[vifi] < 255) {
|
|
cache->mfc_un.res.ttls[vifi] = ttls[vifi];
|
|
if (cache->mfc_un.res.minvif > vifi)
|
|
cache->mfc_un.res.minvif = vifi;
|
|
if (cache->mfc_un.res.maxvif <= vifi)
|
|
cache->mfc_un.res.maxvif = vifi + 1;
|
|
}
|
|
}
|
|
cache->mfc_un.res.lastuse = jiffies;
|
|
}
|
|
|
|
static int vif_add(struct net *net, struct mr_table *mrt,
|
|
struct vifctl *vifc, int mrtsock)
|
|
{
|
|
struct netdev_phys_item_id ppid = { };
|
|
int vifi = vifc->vifc_vifi;
|
|
struct vif_device *v = &mrt->vif_table[vifi];
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
int err;
|
|
|
|
/* Is vif busy ? */
|
|
if (VIF_EXISTS(mrt, vifi))
|
|
return -EADDRINUSE;
|
|
|
|
switch (vifc->vifc_flags) {
|
|
case VIFF_REGISTER:
|
|
if (!ipmr_pimsm_enabled())
|
|
return -EINVAL;
|
|
/* Special Purpose VIF in PIM
|
|
* All the packets will be sent to the daemon
|
|
*/
|
|
if (mrt->mroute_reg_vif_num >= 0)
|
|
return -EADDRINUSE;
|
|
dev = ipmr_reg_vif(net, mrt);
|
|
if (!dev)
|
|
return -ENOBUFS;
|
|
err = dev_set_allmulti(dev, 1);
|
|
if (err) {
|
|
unregister_netdevice(dev);
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
break;
|
|
case VIFF_TUNNEL:
|
|
dev = ipmr_new_tunnel(net, vifc);
|
|
if (IS_ERR(dev))
|
|
return PTR_ERR(dev);
|
|
break;
|
|
case VIFF_USE_IFINDEX:
|
|
case 0:
|
|
if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
|
|
dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
|
|
if (dev && !__in_dev_get_rtnl(dev)) {
|
|
dev_put(dev);
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
} else {
|
|
dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
|
|
}
|
|
if (!dev)
|
|
return -EADDRNOTAVAIL;
|
|
err = dev_set_allmulti(dev, 1);
|
|
if (err) {
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (!in_dev) {
|
|
dev_put(dev);
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING,
|
|
dev->ifindex, &in_dev->cnf);
|
|
ip_rt_multicast_event(in_dev);
|
|
|
|
/* Fill in the VIF structures */
|
|
vif_device_init(v, dev, vifc->vifc_rate_limit,
|
|
vifc->vifc_threshold,
|
|
vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0),
|
|
(VIFF_TUNNEL | VIFF_REGISTER));
|
|
|
|
err = dev_get_port_parent_id(dev, &ppid, true);
|
|
if (err == 0) {
|
|
memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len);
|
|
v->dev_parent_id.id_len = ppid.id_len;
|
|
} else {
|
|
v->dev_parent_id.id_len = 0;
|
|
}
|
|
|
|
v->local = vifc->vifc_lcl_addr.s_addr;
|
|
v->remote = vifc->vifc_rmt_addr.s_addr;
|
|
|
|
/* And finish update writing critical data */
|
|
spin_lock(&mrt_lock);
|
|
rcu_assign_pointer(v->dev, dev);
|
|
netdev_tracker_alloc(dev, &v->dev_tracker, GFP_ATOMIC);
|
|
if (v->flags & VIFF_REGISTER) {
|
|
/* Pairs with READ_ONCE() in ipmr_cache_report() and reg_vif_xmit() */
|
|
WRITE_ONCE(mrt->mroute_reg_vif_num, vifi);
|
|
}
|
|
if (vifi+1 > mrt->maxvif)
|
|
WRITE_ONCE(mrt->maxvif, vifi + 1);
|
|
spin_unlock(&mrt_lock);
|
|
call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, dev,
|
|
vifi, mrt->id);
|
|
return 0;
|
|
}
|
|
|
|
/* called with rcu_read_lock() */
|
|
static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
|
|
__be32 origin,
|
|
__be32 mcastgrp)
|
|
{
|
|
struct mfc_cache_cmp_arg arg = {
|
|
.mfc_mcastgrp = mcastgrp,
|
|
.mfc_origin = origin
|
|
};
|
|
|
|
return mr_mfc_find(mrt, &arg);
|
|
}
|
|
|
|
/* Look for a (*,G) entry */
|
|
static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
|
|
__be32 mcastgrp, int vifi)
|
|
{
|
|
struct mfc_cache_cmp_arg arg = {
|
|
.mfc_mcastgrp = mcastgrp,
|
|
.mfc_origin = htonl(INADDR_ANY)
|
|
};
|
|
|
|
if (mcastgrp == htonl(INADDR_ANY))
|
|
return mr_mfc_find_any_parent(mrt, vifi);
|
|
return mr_mfc_find_any(mrt, vifi, &arg);
|
|
}
|
|
|
|
/* Look for a (S,G,iif) entry if parent != -1 */
|
|
static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt,
|
|
__be32 origin, __be32 mcastgrp,
|
|
int parent)
|
|
{
|
|
struct mfc_cache_cmp_arg arg = {
|
|
.mfc_mcastgrp = mcastgrp,
|
|
.mfc_origin = origin,
|
|
};
|
|
|
|
return mr_mfc_find_parent(mrt, &arg, parent);
|
|
}
|
|
|
|
/* Allocate a multicast cache entry */
|
|
static struct mfc_cache *ipmr_cache_alloc(void)
|
|
{
|
|
struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
|
|
|
|
if (c) {
|
|
c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
|
|
c->_c.mfc_un.res.minvif = MAXVIFS;
|
|
c->_c.free = ipmr_cache_free_rcu;
|
|
refcount_set(&c->_c.mfc_un.res.refcount, 1);
|
|
}
|
|
return c;
|
|
}
|
|
|
|
static struct mfc_cache *ipmr_cache_alloc_unres(void)
|
|
{
|
|
struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
|
|
|
|
if (c) {
|
|
skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
|
|
c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/* A cache entry has gone into a resolved state from queued */
|
|
static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
|
|
struct mfc_cache *uc, struct mfc_cache *c)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct nlmsgerr *e;
|
|
|
|
/* Play the pending entries through our router */
|
|
while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
|
|
if (ip_hdr(skb)->version == 0) {
|
|
struct nlmsghdr *nlh = skb_pull(skb,
|
|
sizeof(struct iphdr));
|
|
|
|
if (mr_fill_mroute(mrt, skb, &c->_c,
|
|
nlmsg_data(nlh)) > 0) {
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) -
|
|
(u8 *)nlh;
|
|
} else {
|
|
nlh->nlmsg_type = NLMSG_ERROR;
|
|
nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
|
|
skb_trim(skb, nlh->nlmsg_len);
|
|
e = nlmsg_data(nlh);
|
|
e->error = -EMSGSIZE;
|
|
memset(&e->msg, 0, sizeof(e->msg));
|
|
}
|
|
|
|
rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
|
|
} else {
|
|
rcu_read_lock();
|
|
ip_mr_forward(net, mrt, skb->dev, skb, c, 0);
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Bounce a cache query up to mrouted and netlink.
|
|
*
|
|
* Called under rcu_read_lock().
|
|
*/
|
|
static int ipmr_cache_report(const struct mr_table *mrt,
|
|
struct sk_buff *pkt, vifi_t vifi, int assert)
|
|
{
|
|
const int ihl = ip_hdrlen(pkt);
|
|
struct sock *mroute_sk;
|
|
struct igmphdr *igmp;
|
|
struct igmpmsg *msg;
|
|
struct sk_buff *skb;
|
|
int ret;
|
|
|
|
mroute_sk = rcu_dereference(mrt->mroute_sk);
|
|
if (!mroute_sk)
|
|
return -EINVAL;
|
|
|
|
if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE)
|
|
skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
|
|
else
|
|
skb = alloc_skb(128, GFP_ATOMIC);
|
|
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) {
|
|
/* Ugly, but we have no choice with this interface.
|
|
* Duplicate old header, fix ihl, length etc.
|
|
* And all this only to mangle msg->im_msgtype and
|
|
* to set msg->im_mbz to "mbz" :-)
|
|
*/
|
|
skb_push(skb, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb);
|
|
skb_reset_transport_header(skb);
|
|
msg = (struct igmpmsg *)skb_network_header(skb);
|
|
memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
|
|
msg->im_msgtype = assert;
|
|
msg->im_mbz = 0;
|
|
if (assert == IGMPMSG_WRVIFWHOLE) {
|
|
msg->im_vif = vifi;
|
|
msg->im_vif_hi = vifi >> 8;
|
|
} else {
|
|
/* Pairs with WRITE_ONCE() in vif_add() and vif_delete() */
|
|
int vif_num = READ_ONCE(mrt->mroute_reg_vif_num);
|
|
|
|
msg->im_vif = vif_num;
|
|
msg->im_vif_hi = vif_num >> 8;
|
|
}
|
|
ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
|
|
ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
|
|
sizeof(struct iphdr));
|
|
} else {
|
|
/* Copy the IP header */
|
|
skb_set_network_header(skb, skb->len);
|
|
skb_put(skb, ihl);
|
|
skb_copy_to_linear_data(skb, pkt->data, ihl);
|
|
/* Flag to the kernel this is a route add */
|
|
ip_hdr(skb)->protocol = 0;
|
|
msg = (struct igmpmsg *)skb_network_header(skb);
|
|
msg->im_vif = vifi;
|
|
msg->im_vif_hi = vifi >> 8;
|
|
ipv4_pktinfo_prepare(mroute_sk, pkt, false);
|
|
memcpy(skb->cb, pkt->cb, sizeof(skb->cb));
|
|
/* Add our header */
|
|
igmp = skb_put(skb, sizeof(struct igmphdr));
|
|
igmp->type = assert;
|
|
msg->im_msgtype = assert;
|
|
igmp->code = 0;
|
|
ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
|
|
skb->transport_header = skb->network_header;
|
|
}
|
|
|
|
igmpmsg_netlink_event(mrt, skb);
|
|
|
|
/* Deliver to mrouted */
|
|
ret = sock_queue_rcv_skb(mroute_sk, skb);
|
|
|
|
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! */
|
|
/* Called under rcu_read_lock() */
|
|
static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
|
|
struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
struct mfc_cache *c;
|
|
bool found = false;
|
|
int err;
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
|
|
if (c->mfc_mcastgrp == iph->daddr &&
|
|
c->mfc_origin == iph->saddr) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
/* Create a new entry if allowable */
|
|
c = ipmr_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->mfc_origin = iph->saddr;
|
|
c->mfc_mcastgrp = iph->daddr;
|
|
|
|
/* Reflect first query at mrouted. */
|
|
err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
|
|
|
|
if (err < 0) {
|
|
/* If the report failed throw the cache entry
|
|
out - Brad Parker
|
|
*/
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
ipmr_cache_free(c);
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
atomic_inc(&mrt->cache_resolve_queue_len);
|
|
list_add(&c->_c.list, &mrt->mfc_unres_queue);
|
|
mroute_netlink_event(mrt, c, RTM_NEWROUTE);
|
|
|
|
if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
|
|
mod_timer(&mrt->ipmr_expire_timer,
|
|
c->_c.mfc_un.unres.expires);
|
|
}
|
|
|
|
/* See if we can append the packet */
|
|
if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
|
|
kfree_skb(skb);
|
|
err = -ENOBUFS;
|
|
} else {
|
|
if (dev) {
|
|
skb->dev = dev;
|
|
skb->skb_iif = dev->ifindex;
|
|
}
|
|
skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
|
|
err = 0;
|
|
}
|
|
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
return err;
|
|
}
|
|
|
|
/* MFC cache manipulation by user space mroute daemon */
|
|
|
|
static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
|
|
{
|
|
struct net *net = read_pnet(&mrt->net);
|
|
struct mfc_cache *c;
|
|
|
|
/* The entries are added/deleted only under RTNL */
|
|
rcu_read_lock();
|
|
c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
|
|
mfc->mfcc_mcastgrp.s_addr, parent);
|
|
rcu_read_unlock();
|
|
if (!c)
|
|
return -ENOENT;
|
|
rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params);
|
|
list_del_rcu(&c->_c.list);
|
|
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id);
|
|
mroute_netlink_event(mrt, c, RTM_DELROUTE);
|
|
mr_cache_put(&c->_c);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
|
|
struct mfcctl *mfc, int mrtsock, int parent)
|
|
{
|
|
struct mfc_cache *uc, *c;
|
|
struct mr_mfc *_uc;
|
|
bool found;
|
|
int ret;
|
|
|
|
if (mfc->mfcc_parent >= MAXVIFS)
|
|
return -ENFILE;
|
|
|
|
/* The entries are added/deleted only under RTNL */
|
|
rcu_read_lock();
|
|
c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
|
|
mfc->mfcc_mcastgrp.s_addr, parent);
|
|
rcu_read_unlock();
|
|
if (c) {
|
|
spin_lock(&mrt_lock);
|
|
c->_c.mfc_parent = mfc->mfcc_parent;
|
|
ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
|
|
if (!mrtsock)
|
|
c->_c.mfc_flags |= MFC_STATIC;
|
|
spin_unlock(&mrt_lock);
|
|
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c,
|
|
mrt->id);
|
|
mroute_netlink_event(mrt, c, RTM_NEWROUTE);
|
|
return 0;
|
|
}
|
|
|
|
if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
|
|
!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
|
|
return -EINVAL;
|
|
|
|
c = ipmr_cache_alloc();
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
c->mfc_origin = mfc->mfcc_origin.s_addr;
|
|
c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
|
|
c->_c.mfc_parent = mfc->mfcc_parent;
|
|
ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
|
|
if (!mrtsock)
|
|
c->_c.mfc_flags |= MFC_STATIC;
|
|
|
|
ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
|
|
ipmr_rht_params);
|
|
if (ret) {
|
|
pr_err("ipmr: rhtable insert error %d\n", ret);
|
|
ipmr_cache_free(c);
|
|
return ret;
|
|
}
|
|
list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
|
|
/* Check to see if we resolved a queued list. If so we
|
|
* need to send on the frames and tidy up.
|
|
*/
|
|
found = false;
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
|
|
uc = (struct mfc_cache *)_uc;
|
|
if (uc->mfc_origin == c->mfc_origin &&
|
|
uc->mfc_mcastgrp == c->mfc_mcastgrp) {
|
|
list_del(&_uc->list);
|
|
atomic_dec(&mrt->cache_resolve_queue_len);
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (list_empty(&mrt->mfc_unres_queue))
|
|
del_timer(&mrt->ipmr_expire_timer);
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
if (found) {
|
|
ipmr_cache_resolve(net, mrt, uc, c);
|
|
ipmr_cache_free(uc);
|
|
}
|
|
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id);
|
|
mroute_netlink_event(mrt, c, RTM_NEWROUTE);
|
|
return 0;
|
|
}
|
|
|
|
/* Close the multicast socket, and clear the vif tables etc */
|
|
static void mroute_clean_tables(struct mr_table *mrt, int flags)
|
|
{
|
|
struct net *net = read_pnet(&mrt->net);
|
|
struct mr_mfc *c, *tmp;
|
|
struct mfc_cache *cache;
|
|
LIST_HEAD(list);
|
|
int i;
|
|
|
|
/* Shut down all active vif entries */
|
|
if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) {
|
|
for (i = 0; i < mrt->maxvif; i++) {
|
|
if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
|
|
!(flags & MRT_FLUSH_VIFS_STATIC)) ||
|
|
(!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS)))
|
|
continue;
|
|
vif_delete(mrt, i, 0, &list);
|
|
}
|
|
unregister_netdevice_many(&list);
|
|
}
|
|
|
|
/* Wipe the cache */
|
|
if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) {
|
|
list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
|
|
if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) ||
|
|
(!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC)))
|
|
continue;
|
|
rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
|
|
list_del_rcu(&c->list);
|
|
cache = (struct mfc_cache *)c;
|
|
call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache,
|
|
mrt->id);
|
|
mroute_netlink_event(mrt, cache, RTM_DELROUTE);
|
|
mr_cache_put(c);
|
|
}
|
|
}
|
|
|
|
if (flags & MRT_FLUSH_MFC) {
|
|
if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
|
|
list_del(&c->list);
|
|
cache = (struct mfc_cache *)c;
|
|
mroute_netlink_event(mrt, cache, RTM_DELROUTE);
|
|
ipmr_destroy_unres(mrt, cache);
|
|
}
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* called from ip_ra_control(), before an RCU grace period,
|
|
* we don't need to call synchronize_rcu() here
|
|
*/
|
|
static void mrtsock_destruct(struct sock *sk)
|
|
{
|
|
struct net *net = sock_net(sk);
|
|
struct mr_table *mrt;
|
|
|
|
rtnl_lock();
|
|
ipmr_for_each_table(mrt, net) {
|
|
if (sk == rtnl_dereference(mrt->mroute_sk)) {
|
|
IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_MC_FORWARDING,
|
|
NETCONFA_IFINDEX_ALL,
|
|
net->ipv4.devconf_all);
|
|
RCU_INIT_POINTER(mrt->mroute_sk, NULL);
|
|
mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC);
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
/* Socket options and virtual interface manipulation. The whole
|
|
* virtual interface system is a complete heap, but unfortunately
|
|
* that's how BSD mrouted happens to think. Maybe one day with a proper
|
|
* MOSPF/PIM router set up we can clean this up.
|
|
*/
|
|
|
|
int ip_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
|
|
unsigned int optlen)
|
|
{
|
|
struct net *net = sock_net(sk);
|
|
int val, ret = 0, parent = 0;
|
|
struct mr_table *mrt;
|
|
struct vifctl vif;
|
|
struct mfcctl mfc;
|
|
bool do_wrvifwhole;
|
|
u32 uval;
|
|
|
|
/* There's one exception to the lock - MRT_DONE which needs to unlock */
|
|
rtnl_lock();
|
|
if (sk->sk_type != SOCK_RAW ||
|
|
inet_sk(sk)->inet_num != IPPROTO_IGMP) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out_unlock;
|
|
}
|
|
|
|
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
|
|
if (!mrt) {
|
|
ret = -ENOENT;
|
|
goto out_unlock;
|
|
}
|
|
if (optname != MRT_INIT) {
|
|
if (sk != rcu_access_pointer(mrt->mroute_sk) &&
|
|
!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
|
|
ret = -EACCES;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
switch (optname) {
|
|
case MRT_INIT:
|
|
if (optlen != sizeof(int)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (rtnl_dereference(mrt->mroute_sk)) {
|
|
ret = -EADDRINUSE;
|
|
break;
|
|
}
|
|
|
|
ret = ip_ra_control(sk, 1, mrtsock_destruct);
|
|
if (ret == 0) {
|
|
rcu_assign_pointer(mrt->mroute_sk, sk);
|
|
IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_MC_FORWARDING,
|
|
NETCONFA_IFINDEX_ALL,
|
|
net->ipv4.devconf_all);
|
|
}
|
|
break;
|
|
case MRT_DONE:
|
|
if (sk != rcu_access_pointer(mrt->mroute_sk)) {
|
|
ret = -EACCES;
|
|
} else {
|
|
/* We need to unlock here because mrtsock_destruct takes
|
|
* care of rtnl itself and we can't change that due to
|
|
* the IP_ROUTER_ALERT setsockopt which runs without it.
|
|
*/
|
|
rtnl_unlock();
|
|
ret = ip_ra_control(sk, 0, NULL);
|
|
goto out;
|
|
}
|
|
break;
|
|
case MRT_ADD_VIF:
|
|
case MRT_DEL_VIF:
|
|
if (optlen != sizeof(vif)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (copy_from_sockptr(&vif, optval, sizeof(vif))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
if (vif.vifc_vifi >= MAXVIFS) {
|
|
ret = -ENFILE;
|
|
break;
|
|
}
|
|
if (optname == MRT_ADD_VIF) {
|
|
ret = vif_add(net, mrt, &vif,
|
|
sk == rtnl_dereference(mrt->mroute_sk));
|
|
} else {
|
|
ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
|
|
}
|
|
break;
|
|
/* Manipulate the forwarding caches. These live
|
|
* in a sort of kernel/user symbiosis.
|
|
*/
|
|
case MRT_ADD_MFC:
|
|
case MRT_DEL_MFC:
|
|
parent = -1;
|
|
fallthrough;
|
|
case MRT_ADD_MFC_PROXY:
|
|
case MRT_DEL_MFC_PROXY:
|
|
if (optlen != sizeof(mfc)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (copy_from_sockptr(&mfc, optval, sizeof(mfc))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
if (parent == 0)
|
|
parent = mfc.mfcc_parent;
|
|
if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
|
|
ret = ipmr_mfc_delete(mrt, &mfc, parent);
|
|
else
|
|
ret = ipmr_mfc_add(net, mrt, &mfc,
|
|
sk == rtnl_dereference(mrt->mroute_sk),
|
|
parent);
|
|
break;
|
|
case MRT_FLUSH:
|
|
if (optlen != sizeof(val)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (copy_from_sockptr(&val, optval, sizeof(val))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
mroute_clean_tables(mrt, val);
|
|
break;
|
|
/* Control PIM assert. */
|
|
case MRT_ASSERT:
|
|
if (optlen != sizeof(val)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (copy_from_sockptr(&val, optval, sizeof(val))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
mrt->mroute_do_assert = val;
|
|
break;
|
|
case MRT_PIM:
|
|
if (!ipmr_pimsm_enabled()) {
|
|
ret = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (optlen != sizeof(val)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (copy_from_sockptr(&val, optval, sizeof(val))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE);
|
|
val = !!val;
|
|
if (val != mrt->mroute_do_pim) {
|
|
mrt->mroute_do_pim = val;
|
|
mrt->mroute_do_assert = val;
|
|
mrt->mroute_do_wrvifwhole = do_wrvifwhole;
|
|
}
|
|
break;
|
|
case MRT_TABLE:
|
|
if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
|
|
ret = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (optlen != sizeof(uval)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (copy_from_sockptr(&uval, optval, sizeof(uval))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (sk == rtnl_dereference(mrt->mroute_sk)) {
|
|
ret = -EBUSY;
|
|
} else {
|
|
mrt = ipmr_new_table(net, uval);
|
|
if (IS_ERR(mrt))
|
|
ret = PTR_ERR(mrt);
|
|
else
|
|
raw_sk(sk)->ipmr_table = uval;
|
|
}
|
|
break;
|
|
/* Spurious command, or MRT_VERSION which you cannot set. */
|
|
default:
|
|
ret = -ENOPROTOOPT;
|
|
}
|
|
out_unlock:
|
|
rtnl_unlock();
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/* Execute if this ioctl is a special mroute ioctl */
|
|
int ipmr_sk_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
|
|
{
|
|
switch (cmd) {
|
|
/* These userspace buffers will be consumed by ipmr_ioctl() */
|
|
case SIOCGETVIFCNT: {
|
|
struct sioc_vif_req buffer;
|
|
|
|
return sock_ioctl_inout(sk, cmd, arg, &buffer,
|
|
sizeof(buffer));
|
|
}
|
|
case SIOCGETSGCNT: {
|
|
struct sioc_sg_req buffer;
|
|
|
|
return sock_ioctl_inout(sk, cmd, arg, &buffer,
|
|
sizeof(buffer));
|
|
}
|
|
}
|
|
/* return code > 0 means that the ioctl was not executed */
|
|
return 1;
|
|
}
|
|
|
|
/* Getsock opt support for the multicast routing system. */
|
|
int ip_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_IGMP)
|
|
return -EOPNOTSUPP;
|
|
|
|
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
|
|
if (!mrt)
|
|
return -ENOENT;
|
|
|
|
switch (optname) {
|
|
case MRT_VERSION:
|
|
val = 0x0305;
|
|
break;
|
|
case MRT_PIM:
|
|
if (!ipmr_pimsm_enabled())
|
|
return -ENOPROTOOPT;
|
|
val = mrt->mroute_do_pim;
|
|
break;
|
|
case MRT_ASSERT:
|
|
val = mrt->mroute_do_assert;
|
|
break;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (copy_from_sockptr(&olr, optlen, sizeof(int)))
|
|
return -EFAULT;
|
|
if (olr < 0)
|
|
return -EINVAL;
|
|
|
|
olr = min_t(unsigned int, olr, sizeof(int));
|
|
|
|
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 ipmr_ioctl(struct sock *sk, int cmd, void *arg)
|
|
{
|
|
struct vif_device *vif;
|
|
struct mfc_cache *c;
|
|
struct net *net = sock_net(sk);
|
|
struct sioc_vif_req *vr;
|
|
struct sioc_sg_req *sr;
|
|
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:
|
|
vr = (struct sioc_vif_req *)arg;
|
|
if (vr->vifi >= mrt->maxvif)
|
|
return -EINVAL;
|
|
vr->vifi = array_index_nospec(vr->vifi, mrt->maxvif);
|
|
rcu_read_lock();
|
|
vif = &mrt->vif_table[vr->vifi];
|
|
if (VIF_EXISTS(mrt, vr->vifi)) {
|
|
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();
|
|
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
return -EADDRNOTAVAIL;
|
|
case SIOCGETSGCNT:
|
|
sr = (struct sioc_sg_req *)arg;
|
|
|
|
rcu_read_lock();
|
|
c = ipmr_cache_find(mrt, sr->src.s_addr, sr->grp.s_addr);
|
|
if (c) {
|
|
sr->pktcnt = c->_c.mfc_un.res.pkt;
|
|
sr->bytecnt = c->_c.mfc_un.res.bytes;
|
|
sr->wrong_if = c->_c.mfc_un.res.wrong_if;
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
return -EADDRNOTAVAIL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_sioc_sg_req {
|
|
struct in_addr src;
|
|
struct in_addr grp;
|
|
compat_ulong_t pktcnt;
|
|
compat_ulong_t bytecnt;
|
|
compat_ulong_t wrong_if;
|
|
};
|
|
|
|
struct compat_sioc_vif_req {
|
|
vifi_t vifi; /* Which iface */
|
|
compat_ulong_t icount;
|
|
compat_ulong_t ocount;
|
|
compat_ulong_t ibytes;
|
|
compat_ulong_t obytes;
|
|
};
|
|
|
|
int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct compat_sioc_sg_req sr;
|
|
struct compat_sioc_vif_req vr;
|
|
struct vif_device *vif;
|
|
struct mfc_cache *c;
|
|
struct net *net = sock_net(sk);
|
|
struct mr_table *mrt;
|
|
|
|
mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
|
|
if (!mrt)
|
|
return -ENOENT;
|
|
|
|
switch (cmd) {
|
|
case SIOCGETVIFCNT:
|
|
if (copy_from_user(&vr, arg, sizeof(vr)))
|
|
return -EFAULT;
|
|
if (vr.vifi >= mrt->maxvif)
|
|
return -EINVAL;
|
|
vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
|
|
rcu_read_lock();
|
|
vif = &mrt->vif_table[vr.vifi];
|
|
if (VIF_EXISTS(mrt, vr.vifi)) {
|
|
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:
|
|
if (copy_from_user(&sr, arg, sizeof(sr)))
|
|
return -EFAULT;
|
|
|
|
rcu_read_lock();
|
|
c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
|
|
if (c) {
|
|
sr.pktcnt = c->_c.mfc_un.res.pkt;
|
|
sr.bytecnt = c->_c.mfc_un.res.bytes;
|
|
sr.wrong_if = c->_c.mfc_un.res.wrong_if;
|
|
rcu_read_unlock();
|
|
|
|
if (copy_to_user(arg, &sr, sizeof(sr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
return -EADDRNOTAVAIL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct net *net = dev_net(dev);
|
|
struct mr_table *mrt;
|
|
struct vif_device *v;
|
|
int ct;
|
|
|
|
if (event != NETDEV_UNREGISTER)
|
|
return NOTIFY_DONE;
|
|
|
|
ipmr_for_each_table(mrt, net) {
|
|
v = &mrt->vif_table[0];
|
|
for (ct = 0; ct < mrt->maxvif; ct++, v++) {
|
|
if (rcu_access_pointer(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_ct(skb);
|
|
}
|
|
|
|
static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct ip_options *opt = &(IPCB(skb)->opt);
|
|
|
|
IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
|
|
|
|
if (unlikely(opt->optlen))
|
|
ip_forward_options(skb);
|
|
|
|
return dst_output(net, sk, skb);
|
|
}
|
|
|
|
#ifdef CONFIG_NET_SWITCHDEV
|
|
static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
|
|
int in_vifi, int out_vifi)
|
|
{
|
|
struct vif_device *out_vif = &mrt->vif_table[out_vifi];
|
|
struct vif_device *in_vif = &mrt->vif_table[in_vifi];
|
|
|
|
if (!skb->offload_l3_fwd_mark)
|
|
return false;
|
|
if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len)
|
|
return false;
|
|
return netdev_phys_item_id_same(&out_vif->dev_parent_id,
|
|
&in_vif->dev_parent_id);
|
|
}
|
|
#else
|
|
static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
|
|
int in_vifi, int out_vifi)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
/* Processing handlers for ipmr_forward, under rcu_read_lock() */
|
|
|
|
static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
|
|
int in_vifi, struct sk_buff *skb, int vifi)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
struct vif_device *vif = &mrt->vif_table[vifi];
|
|
struct net_device *vif_dev;
|
|
struct net_device *dev;
|
|
struct rtable *rt;
|
|
struct flowi4 fl4;
|
|
int encap = 0;
|
|
|
|
vif_dev = vif_dev_read(vif);
|
|
if (!vif_dev)
|
|
goto out_free;
|
|
|
|
if (vif->flags & VIFF_REGISTER) {
|
|
WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
|
|
WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
|
|
DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
|
|
DEV_STATS_INC(vif_dev, tx_packets);
|
|
ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
|
|
goto out_free;
|
|
}
|
|
|
|
if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi))
|
|
goto out_free;
|
|
|
|
if (vif->flags & VIFF_TUNNEL) {
|
|
rt = ip_route_output_ports(net, &fl4, NULL,
|
|
vif->remote, vif->local,
|
|
0, 0,
|
|
IPPROTO_IPIP,
|
|
RT_TOS(iph->tos), vif->link);
|
|
if (IS_ERR(rt))
|
|
goto out_free;
|
|
encap = sizeof(struct iphdr);
|
|
} else {
|
|
rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
|
|
0, 0,
|
|
IPPROTO_IPIP,
|
|
RT_TOS(iph->tos), vif->link);
|
|
if (IS_ERR(rt))
|
|
goto out_free;
|
|
}
|
|
|
|
dev = rt->dst.dev;
|
|
|
|
if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
|
|
/* Do not fragment multicasts. Alas, IPv4 does not
|
|
* allow to send ICMP, so that packets will disappear
|
|
* to blackhole.
|
|
*/
|
|
IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
|
|
ip_rt_put(rt);
|
|
goto out_free;
|
|
}
|
|
|
|
encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
|
|
|
|
if (skb_cow(skb, encap)) {
|
|
ip_rt_put(rt);
|
|
goto out_free;
|
|
}
|
|
|
|
WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1);
|
|
WRITE_ONCE(vif->bytes_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 */
|
|
DEV_STATS_INC(vif_dev, tx_packets);
|
|
DEV_STATS_ADD(vif_dev, tx_bytes, skb->len);
|
|
}
|
|
|
|
IPCB(skb)->flags |= IPSKB_FORWARDED;
|
|
|
|
/* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
|
|
* not only before forwarding, but after forwarding on all output
|
|
* interfaces. It is clear, if mrouter runs a multicasting
|
|
* program, it should receive packets not depending to what interface
|
|
* program is joined.
|
|
* If we will not make it, the program will have to join on all
|
|
* interfaces. On the other hand, multihoming host (or router, but
|
|
* not mrouter) cannot join to more than one interface - it will
|
|
* result in receiving multiple packets.
|
|
*/
|
|
NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
|
|
net, NULL, skb, skb->dev, dev,
|
|
ipmr_forward_finish);
|
|
return;
|
|
|
|
out_free:
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/* Called with mrt_lock or rcu_read_lock() */
|
|
static int ipmr_find_vif(const struct mr_table *mrt, struct net_device *dev)
|
|
{
|
|
int ct;
|
|
/* Pairs with WRITE_ONCE() in vif_delete()/vif_add() */
|
|
for (ct = READ_ONCE(mrt->maxvif) - 1; ct >= 0; ct--) {
|
|
if (rcu_access_pointer(mrt->vif_table[ct].dev) == dev)
|
|
break;
|
|
}
|
|
return ct;
|
|
}
|
|
|
|
/* "local" means that we should preserve one skb (for local delivery) */
|
|
/* Called uner rcu_read_lock() */
|
|
static void ip_mr_forward(struct net *net, struct mr_table *mrt,
|
|
struct net_device *dev, struct sk_buff *skb,
|
|
struct mfc_cache *c, int local)
|
|
{
|
|
int true_vifi = ipmr_find_vif(mrt, dev);
|
|
int psend = -1;
|
|
int vif, ct;
|
|
|
|
vif = c->_c.mfc_parent;
|
|
c->_c.mfc_un.res.pkt++;
|
|
c->_c.mfc_un.res.bytes += skb->len;
|
|
c->_c.mfc_un.res.lastuse = jiffies;
|
|
|
|
if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
|
|
struct mfc_cache *cache_proxy;
|
|
|
|
/* For an (*,G) entry, we only check that the 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) {
|
|
if (rt_is_output_route(skb_rtable(skb))) {
|
|
/* It is our own packet, looped back.
|
|
* Very complicated situation...
|
|
*
|
|
* The best workaround until routing daemons will be
|
|
* fixed is not to redistribute packet, if it was
|
|
* send through wrong interface. It means, that
|
|
* multicast applications WILL NOT work for
|
|
* (S,G), which have default multicast route pointing
|
|
* to wrong oif. In any case, it is not a good
|
|
* idea to use multicasting applications on router.
|
|
*/
|
|
goto dont_forward;
|
|
}
|
|
|
|
c->_c.mfc_un.res.wrong_if++;
|
|
|
|
if (true_vifi >= 0 && mrt->mroute_do_assert &&
|
|
/* pimsm uses asserts, when switching from RPT to SPT,
|
|
* so that we cannot check that packet arrived on an oif.
|
|
* It is bad, but otherwise we would need to move pretty
|
|
* large chunk of pimd to kernel. Ough... --ANK
|
|
*/
|
|
(mrt->mroute_do_pim ||
|
|
c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
|
|
time_after(jiffies,
|
|
c->_c.mfc_un.res.last_assert +
|
|
MFC_ASSERT_THRESH)) {
|
|
c->_c.mfc_un.res.last_assert = jiffies;
|
|
ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
|
|
if (mrt->mroute_do_wrvifwhole)
|
|
ipmr_cache_report(mrt, skb, true_vifi,
|
|
IGMPMSG_WRVIFWHOLE);
|
|
}
|
|
goto dont_forward;
|
|
}
|
|
|
|
forward:
|
|
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 (c->mfc_origin == htonl(INADDR_ANY) &&
|
|
c->mfc_mcastgrp == htonl(INADDR_ANY)) {
|
|
if (true_vifi >= 0 &&
|
|
true_vifi != c->_c.mfc_parent &&
|
|
ip_hdr(skb)->ttl >
|
|
c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
|
|
/* It's an (*,*) entry and the packet is not coming from
|
|
* the upstream: forward the packet to the upstream
|
|
* only.
|
|
*/
|
|
psend = c->_c.mfc_parent;
|
|
goto last_forward;
|
|
}
|
|
goto dont_forward;
|
|
}
|
|
for (ct = c->_c.mfc_un.res.maxvif - 1;
|
|
ct >= c->_c.mfc_un.res.minvif; ct--) {
|
|
/* For (*,G) entry, don't forward to the incoming interface */
|
|
if ((c->mfc_origin != htonl(INADDR_ANY) ||
|
|
ct != true_vifi) &&
|
|
ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) {
|
|
if (psend != -1) {
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (skb2)
|
|
ipmr_queue_xmit(net, mrt, true_vifi,
|
|
skb2, psend);
|
|
}
|
|
psend = ct;
|
|
}
|
|
}
|
|
last_forward:
|
|
if (psend != -1) {
|
|
if (local) {
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (skb2)
|
|
ipmr_queue_xmit(net, mrt, true_vifi, skb2,
|
|
psend);
|
|
} else {
|
|
ipmr_queue_xmit(net, mrt, true_vifi, skb, psend);
|
|
return;
|
|
}
|
|
}
|
|
|
|
dont_forward:
|
|
if (!local)
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
|
|
{
|
|
struct rtable *rt = skb_rtable(skb);
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
struct flowi4 fl4 = {
|
|
.daddr = iph->daddr,
|
|
.saddr = iph->saddr,
|
|
.flowi4_tos = RT_TOS(iph->tos),
|
|
.flowi4_oif = (rt_is_output_route(rt) ?
|
|
skb->dev->ifindex : 0),
|
|
.flowi4_iif = (rt_is_output_route(rt) ?
|
|
LOOPBACK_IFINDEX :
|
|
skb->dev->ifindex),
|
|
.flowi4_mark = skb->mark,
|
|
};
|
|
struct mr_table *mrt;
|
|
int err;
|
|
|
|
err = ipmr_fib_lookup(net, &fl4, &mrt);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
return mrt;
|
|
}
|
|
|
|
/* Multicast packets for forwarding arrive here
|
|
* Called with rcu_read_lock();
|
|
*/
|
|
int ip_mr_input(struct sk_buff *skb)
|
|
{
|
|
struct mfc_cache *cache;
|
|
struct net *net = dev_net(skb->dev);
|
|
int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
|
|
struct mr_table *mrt;
|
|
struct net_device *dev;
|
|
|
|
/* skb->dev passed in is the loX master dev for vrfs.
|
|
* As there are no vifs associated with loopback devices,
|
|
* get the proper interface that does have a vif associated with it.
|
|
*/
|
|
dev = skb->dev;
|
|
if (netif_is_l3_master(skb->dev)) {
|
|
dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
|
|
if (!dev) {
|
|
kfree_skb(skb);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
/* Packet is looped back after forward, it should not be
|
|
* forwarded second time, but still can be delivered locally.
|
|
*/
|
|
if (IPCB(skb)->flags & IPSKB_FORWARDED)
|
|
goto dont_forward;
|
|
|
|
mrt = ipmr_rt_fib_lookup(net, skb);
|
|
if (IS_ERR(mrt)) {
|
|
kfree_skb(skb);
|
|
return PTR_ERR(mrt);
|
|
}
|
|
if (!local) {
|
|
if (IPCB(skb)->opt.router_alert) {
|
|
if (ip_call_ra_chain(skb))
|
|
return 0;
|
|
} else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
|
|
/* IGMPv1 (and broken IGMPv2 implementations sort of
|
|
* Cisco IOS <= 11.2(8)) do not put router alert
|
|
* option to IGMP packets destined to routable
|
|
* groups. It is very bad, because it means
|
|
* that we can forward NO IGMP messages.
|
|
*/
|
|
struct sock *mroute_sk;
|
|
|
|
mroute_sk = rcu_dereference(mrt->mroute_sk);
|
|
if (mroute_sk) {
|
|
nf_reset_ct(skb);
|
|
raw_rcv(mroute_sk, skb);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* already under rcu_read_lock() */
|
|
cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
|
|
if (!cache) {
|
|
int vif = ipmr_find_vif(mrt, dev);
|
|
|
|
if (vif >= 0)
|
|
cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
|
|
vif);
|
|
}
|
|
|
|
/* No usable cache entry */
|
|
if (!cache) {
|
|
int vif;
|
|
|
|
if (local) {
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
ip_local_deliver(skb);
|
|
if (!skb2)
|
|
return -ENOBUFS;
|
|
skb = skb2;
|
|
}
|
|
|
|
vif = ipmr_find_vif(mrt, dev);
|
|
if (vif >= 0)
|
|
return ipmr_cache_unresolved(mrt, vif, skb, dev);
|
|
kfree_skb(skb);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ip_mr_forward(net, mrt, dev, skb, cache, local);
|
|
|
|
if (local)
|
|
return ip_local_deliver(skb);
|
|
|
|
return 0;
|
|
|
|
dont_forward:
|
|
if (local)
|
|
return ip_local_deliver(skb);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_PIMSM_V1
|
|
/* Handle IGMP messages of PIMv1 */
|
|
int pim_rcv_v1(struct sk_buff *skb)
|
|
{
|
|
struct igmphdr *pim;
|
|
struct net *net = dev_net(skb->dev);
|
|
struct mr_table *mrt;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
|
|
goto drop;
|
|
|
|
pim = igmp_hdr(skb);
|
|
|
|
mrt = ipmr_rt_fib_lookup(net, skb);
|
|
if (IS_ERR(mrt))
|
|
goto drop;
|
|
if (!mrt->mroute_do_pim ||
|
|
pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
|
|
goto drop;
|
|
|
|
if (__pim_rcv(mrt, skb, sizeof(*pim))) {
|
|
drop:
|
|
kfree_skb(skb);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_IP_PIMSM_V2
|
|
static int pim_rcv(struct sk_buff *skb)
|
|
{
|
|
struct pimreghdr *pim;
|
|
struct net *net = dev_net(skb->dev);
|
|
struct mr_table *mrt;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
|
|
goto drop;
|
|
|
|
pim = (struct pimreghdr *)skb_transport_header(skb);
|
|
if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
|
|
(pim->flags & PIM_NULL_REGISTER) ||
|
|
(ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
|
|
csum_fold(skb_checksum(skb, 0, skb->len, 0))))
|
|
goto drop;
|
|
|
|
mrt = ipmr_rt_fib_lookup(net, skb);
|
|
if (IS_ERR(mrt))
|
|
goto drop;
|
|
if (__pim_rcv(mrt, skb, sizeof(*pim))) {
|
|
drop:
|
|
kfree_skb(skb);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int ipmr_get_route(struct net *net, struct sk_buff *skb,
|
|
__be32 saddr, __be32 daddr,
|
|
struct rtmsg *rtm, u32 portid)
|
|
{
|
|
struct mfc_cache *cache;
|
|
struct mr_table *mrt;
|
|
int err;
|
|
|
|
mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
|
|
if (!mrt)
|
|
return -ENOENT;
|
|
|
|
rcu_read_lock();
|
|
cache = ipmr_cache_find(mrt, saddr, daddr);
|
|
if (!cache && skb->dev) {
|
|
int vif = ipmr_find_vif(mrt, skb->dev);
|
|
|
|
if (vif >= 0)
|
|
cache = ipmr_cache_find_any(mrt, daddr, vif);
|
|
}
|
|
if (!cache) {
|
|
struct sk_buff *skb2;
|
|
struct iphdr *iph;
|
|
struct net_device *dev;
|
|
int vif = -1;
|
|
|
|
dev = skb->dev;
|
|
if (dev)
|
|
vif = ipmr_find_vif(mrt, dev);
|
|
if (vif < 0) {
|
|
rcu_read_unlock();
|
|
return -ENODEV;
|
|
}
|
|
|
|
skb2 = skb_realloc_headroom(skb, sizeof(struct iphdr));
|
|
if (!skb2) {
|
|
rcu_read_unlock();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
NETLINK_CB(skb2).portid = portid;
|
|
skb_push(skb2, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb2);
|
|
iph = ip_hdr(skb2);
|
|
iph->ihl = sizeof(struct iphdr) >> 2;
|
|
iph->saddr = saddr;
|
|
iph->daddr = daddr;
|
|
iph->version = 0;
|
|
err = ipmr_cache_unresolved(mrt, vif, skb2, dev);
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
|
|
u32 portid, u32 seq, struct mfc_cache *c, int cmd,
|
|
int flags)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct rtmsg *rtm;
|
|
int err;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
|
|
if (!nlh)
|
|
return -EMSGSIZE;
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
rtm->rtm_family = RTNL_FAMILY_IPMR;
|
|
rtm->rtm_dst_len = 32;
|
|
rtm->rtm_src_len = 32;
|
|
rtm->rtm_tos = 0;
|
|
rtm->rtm_table = mrt->id;
|
|
if (nla_put_u32(skb, RTA_TABLE, mrt->id))
|
|
goto nla_put_failure;
|
|
rtm->rtm_type = RTN_MULTICAST;
|
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
if (c->_c.mfc_flags & MFC_STATIC)
|
|
rtm->rtm_protocol = RTPROT_STATIC;
|
|
else
|
|
rtm->rtm_protocol = RTPROT_MROUTED;
|
|
rtm->rtm_flags = 0;
|
|
|
|
if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
|
|
nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
|
|
goto nla_put_failure;
|
|
err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
|
|
/* do not break the dump if cache is unresolved */
|
|
if (err < 0 && err != -ENOENT)
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
|
|
u32 portid, u32 seq, struct mr_mfc *c, int cmd,
|
|
int flags)
|
|
{
|
|
return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c,
|
|
cmd, flags);
|
|
}
|
|
|
|
static size_t mroute_msgsize(bool unresolved, int maxvif)
|
|
{
|
|
size_t len =
|
|
NLMSG_ALIGN(sizeof(struct rtmsg))
|
|
+ nla_total_size(4) /* RTA_TABLE */
|
|
+ nla_total_size(4) /* RTA_SRC */
|
|
+ nla_total_size(4) /* RTA_DST */
|
|
;
|
|
|
|
if (!unresolved)
|
|
len = len
|
|
+ nla_total_size(4) /* RTA_IIF */
|
|
+ nla_total_size(0) /* RTA_MULTIPATH */
|
|
+ maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
|
|
/* RTA_MFC_STATS */
|
|
+ nla_total_size_64bit(sizeof(struct rta_mfc_stats))
|
|
;
|
|
|
|
return len;
|
|
}
|
|
|
|
static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
|
|
int cmd)
|
|
{
|
|
struct net *net = read_pnet(&mrt->net);
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS,
|
|
mrt->maxvif),
|
|
GFP_ATOMIC);
|
|
if (!skb)
|
|
goto errout;
|
|
|
|
err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
|
|
return;
|
|
|
|
errout:
|
|
kfree_skb(skb);
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
|
|
}
|
|
|
|
static size_t igmpmsg_netlink_msgsize(size_t payloadlen)
|
|
{
|
|
size_t len =
|
|
NLMSG_ALIGN(sizeof(struct rtgenmsg))
|
|
+ nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */
|
|
+ nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */
|
|
+ nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */
|
|
+ nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */
|
|
+ nla_total_size(4) /* IPMRA_CREPORT_TABLE */
|
|
/* IPMRA_CREPORT_PKT */
|
|
+ nla_total_size(payloadlen)
|
|
;
|
|
|
|
return len;
|
|
}
|
|
|
|
static void igmpmsg_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 igmpmsg *msg;
|
|
struct sk_buff *skb;
|
|
struct nlattr *nla;
|
|
int payloadlen;
|
|
|
|
payloadlen = pkt->len - sizeof(struct igmpmsg);
|
|
msg = (struct igmpmsg *)skb_network_header(pkt);
|
|
|
|
skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC);
|
|
if (!skb)
|
|
goto errout;
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
|
|
sizeof(struct rtgenmsg), 0);
|
|
if (!nlh)
|
|
goto errout;
|
|
rtgenm = nlmsg_data(nlh);
|
|
rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
|
|
if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
|
|
nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif | (msg->im_vif_hi << 8)) ||
|
|
nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
|
|
msg->im_src.s_addr) ||
|
|
nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
|
|
msg->im_dst.s_addr) ||
|
|
nla_put_u32(skb, IPMRA_CREPORT_TABLE, mrt->id))
|
|
goto nla_put_failure;
|
|
|
|
nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
|
|
if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg),
|
|
nla_data(nla), payloadlen))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
|
|
rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC);
|
|
return;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
errout:
|
|
kfree_skb(skb);
|
|
rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
|
|
}
|
|
|
|
static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
struct nlattr **tb,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct rtmsg *rtm;
|
|
int i, err;
|
|
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
|
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!netlink_strict_get_check(skb))
|
|
return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
|
|
rtm_ipv4_policy, extack);
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
|
|
(rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
|
|
rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
|
|
rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
|
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
|
|
rtm_ipv4_policy, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
|
|
(tb[RTA_DST] && !rtm->rtm_dst_len)) {
|
|
NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4");
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i <= RTA_MAX; i++) {
|
|
if (!tb[i])
|
|
continue;
|
|
|
|
switch (i) {
|
|
case RTA_SRC:
|
|
case RTA_DST:
|
|
case RTA_TABLE:
|
|
break;
|
|
default:
|
|
NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(in_skb->sk);
|
|
struct nlattr *tb[RTA_MAX + 1];
|
|
struct sk_buff *skb = NULL;
|
|
struct mfc_cache *cache;
|
|
struct mr_table *mrt;
|
|
__be32 src, grp;
|
|
u32 tableid;
|
|
int err;
|
|
|
|
err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
|
|
grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
|
|
tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
|
|
|
|
mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
|
|
if (!mrt) {
|
|
err = -ENOENT;
|
|
goto errout_free;
|
|
}
|
|
|
|
/* entries are added/deleted only under RTNL */
|
|
rcu_read_lock();
|
|
cache = ipmr_cache_find(mrt, src, grp);
|
|
rcu_read_unlock();
|
|
if (!cache) {
|
|
err = -ENOENT;
|
|
goto errout_free;
|
|
}
|
|
|
|
skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL);
|
|
if (!skb) {
|
|
err = -ENOBUFS;
|
|
goto errout_free;
|
|
}
|
|
|
|
err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
|
|
nlh->nlmsg_seq, cache,
|
|
RTM_NEWROUTE, 0);
|
|
if (err < 0)
|
|
goto errout_free;
|
|
|
|
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
|
|
|
|
errout:
|
|
return err;
|
|
|
|
errout_free:
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
|
|
static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct fib_dump_filter filter = {};
|
|
int err;
|
|
|
|
if (cb->strict_check) {
|
|
err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh,
|
|
&filter, cb);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (filter.table_id) {
|
|
struct mr_table *mrt;
|
|
|
|
mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id);
|
|
if (!mrt) {
|
|
if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IPMR)
|
|
return skb->len;
|
|
|
|
NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist");
|
|
return -ENOENT;
|
|
}
|
|
err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute,
|
|
&mfc_unres_lock, &filter);
|
|
return skb->len ? : err;
|
|
}
|
|
|
|
return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
|
|
_ipmr_fill_mroute, &mfc_unres_lock, &filter);
|
|
}
|
|
|
|
static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
|
|
[RTA_SRC] = { .type = NLA_U32 },
|
|
[RTA_DST] = { .type = NLA_U32 },
|
|
[RTA_IIF] = { .type = NLA_U32 },
|
|
[RTA_TABLE] = { .type = NLA_U32 },
|
|
[RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
|
|
};
|
|
|
|
static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
|
|
{
|
|
switch (rtm_protocol) {
|
|
case RTPROT_STATIC:
|
|
case RTPROT_MROUTED:
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
|
|
{
|
|
struct rtnexthop *rtnh = nla_data(nla);
|
|
int remaining = nla_len(nla), vifi = 0;
|
|
|
|
while (rtnh_ok(rtnh, remaining)) {
|
|
mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
|
|
if (++vifi == MAXVIFS)
|
|
break;
|
|
rtnh = rtnh_next(rtnh, &remaining);
|
|
}
|
|
|
|
return remaining > 0 ? -EINVAL : vifi;
|
|
}
|
|
|
|
/* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
|
|
static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
|
|
struct mfcctl *mfcc, int *mrtsock,
|
|
struct mr_table **mrtret,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net_device *dev = NULL;
|
|
u32 tblid = RT_TABLE_DEFAULT;
|
|
struct mr_table *mrt;
|
|
struct nlattr *attr;
|
|
struct rtmsg *rtm;
|
|
int ret, rem;
|
|
|
|
ret = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX,
|
|
rtm_ipmr_policy, extack);
|
|
if (ret < 0)
|
|
goto out;
|
|
rtm = nlmsg_data(nlh);
|
|
|
|
ret = -EINVAL;
|
|
if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
|
|
rtm->rtm_type != RTN_MULTICAST ||
|
|
rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
|
|
!ipmr_rtm_validate_proto(rtm->rtm_protocol))
|
|
goto out;
|
|
|
|
memset(mfcc, 0, sizeof(*mfcc));
|
|
mfcc->mfcc_parent = -1;
|
|
ret = 0;
|
|
nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
|
|
switch (nla_type(attr)) {
|
|
case RTA_SRC:
|
|
mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
|
|
break;
|
|
case RTA_DST:
|
|
mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
|
|
break;
|
|
case RTA_IIF:
|
|
dev = __dev_get_by_index(net, nla_get_u32(attr));
|
|
if (!dev) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
break;
|
|
case RTA_MULTIPATH:
|
|
if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
break;
|
|
case RTA_PREFSRC:
|
|
ret = 1;
|
|
break;
|
|
case RTA_TABLE:
|
|
tblid = nla_get_u32(attr);
|
|
break;
|
|
}
|
|
}
|
|
mrt = ipmr_get_table(net, tblid);
|
|
if (!mrt) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
*mrtret = mrt;
|
|
*mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
|
|
if (dev)
|
|
mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/* takes care of both newroute and delroute */
|
|
static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
int ret, mrtsock, parent;
|
|
struct mr_table *tbl;
|
|
struct mfcctl mfcc;
|
|
|
|
mrtsock = 0;
|
|
tbl = NULL;
|
|
ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
parent = ret ? mfcc.mfcc_parent : -1;
|
|
if (nlh->nlmsg_type == RTM_NEWROUTE)
|
|
return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
|
|
else
|
|
return ipmr_mfc_delete(tbl, &mfcc, parent);
|
|
}
|
|
|
|
static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb)
|
|
{
|
|
u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len);
|
|
|
|
if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) ||
|
|
nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) ||
|
|
nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM,
|
|
mrt->mroute_reg_vif_num) ||
|
|
nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT,
|
|
mrt->mroute_do_assert) ||
|
|
nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) ||
|
|
nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE,
|
|
mrt->mroute_do_wrvifwhole))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
|
|
{
|
|
struct net_device *vif_dev;
|
|
struct nlattr *vif_nest;
|
|
struct vif_device *vif;
|
|
|
|
vif = &mrt->vif_table[vifid];
|
|
vif_dev = rtnl_dereference(vif->dev);
|
|
/* if the VIF doesn't exist just continue */
|
|
if (!vif_dev)
|
|
return true;
|
|
|
|
vif_nest = nla_nest_start_noflag(skb, IPMRA_VIF);
|
|
if (!vif_nest)
|
|
return false;
|
|
|
|
if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif_dev->ifindex) ||
|
|
nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) ||
|
|
nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) ||
|
|
nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in,
|
|
IPMRA_VIFA_PAD) ||
|
|
nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out,
|
|
IPMRA_VIFA_PAD) ||
|
|
nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in,
|
|
IPMRA_VIFA_PAD) ||
|
|
nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out,
|
|
IPMRA_VIFA_PAD) ||
|
|
nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) ||
|
|
nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) {
|
|
nla_nest_cancel(skb, vif_nest);
|
|
return false;
|
|
}
|
|
nla_nest_end(skb, vif_nest);
|
|
|
|
return true;
|
|
}
|
|
|
|
static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct ifinfomsg *ifm;
|
|
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
|
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
|
|
NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
|
|
ifm->ifi_change || ifm->ifi_index) {
|
|
NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nlmsghdr *nlh = NULL;
|
|
unsigned int t = 0, s_t;
|
|
unsigned int e = 0, s_e;
|
|
struct mr_table *mrt;
|
|
|
|
if (cb->strict_check) {
|
|
int err = ipmr_valid_dumplink(cb->nlh, cb->extack);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
s_t = cb->args[0];
|
|
s_e = cb->args[1];
|
|
|
|
ipmr_for_each_table(mrt, net) {
|
|
struct nlattr *vifs, *af;
|
|
struct ifinfomsg *hdr;
|
|
u32 i;
|
|
|
|
if (t < s_t)
|
|
goto skip_table;
|
|
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, RTM_NEWLINK,
|
|
sizeof(*hdr), NLM_F_MULTI);
|
|
if (!nlh)
|
|
break;
|
|
|
|
hdr = nlmsg_data(nlh);
|
|
memset(hdr, 0, sizeof(*hdr));
|
|
hdr->ifi_family = RTNL_FAMILY_IPMR;
|
|
|
|
af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
|
|
if (!af) {
|
|
nlmsg_cancel(skb, nlh);
|
|
goto out;
|
|
}
|
|
|
|
if (!ipmr_fill_table(mrt, skb)) {
|
|
nlmsg_cancel(skb, nlh);
|
|
goto out;
|
|
}
|
|
|
|
vifs = nla_nest_start_noflag(skb, IPMRA_TABLE_VIFS);
|
|
if (!vifs) {
|
|
nla_nest_end(skb, af);
|
|
nlmsg_end(skb, nlh);
|
|
goto out;
|
|
}
|
|
for (i = 0; i < mrt->maxvif; i++) {
|
|
if (e < s_e)
|
|
goto skip_entry;
|
|
if (!ipmr_fill_vif(mrt, i, skb)) {
|
|
nla_nest_end(skb, vifs);
|
|
nla_nest_end(skb, af);
|
|
nlmsg_end(skb, nlh);
|
|
goto out;
|
|
}
|
|
skip_entry:
|
|
e++;
|
|
}
|
|
s_e = 0;
|
|
e = 0;
|
|
nla_nest_end(skb, vifs);
|
|
nla_nest_end(skb, af);
|
|
nlmsg_end(skb, nlh);
|
|
skip_table:
|
|
t++;
|
|
}
|
|
|
|
out:
|
|
cb->args[1] = e;
|
|
cb->args[0] = t;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
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|
/* The /proc interfaces to multicast routing :
|
|
* /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
|
|
*/
|
|
|
|
static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(RCU)
|
|
{
|
|
struct mr_vif_iter *iter = seq->private;
|
|
struct net *net = seq_file_net(seq);
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|
struct mr_table *mrt;
|
|
|
|
mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
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|
if (!mrt)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
iter->mrt = mrt;
|
|
|
|
rcu_read_lock();
|
|
return mr_vif_seq_start(seq, pos);
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|
}
|
|
|
|
static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
|
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__releases(RCU)
|
|
{
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct mr_vif_iter *iter = seq->private;
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struct mr_table *mrt = iter->mrt;
|
|
|
|
if (v == SEQ_START_TOKEN) {
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seq_puts(seq,
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"Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
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|
} else {
|
|
const struct vif_device *vif = v;
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|
const struct net_device *vif_dev;
|
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const char *name;
|
|
|
|
vif_dev = vif_dev_read(vif);
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name = vif_dev ? vif_dev->name : "none";
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|
seq_printf(seq,
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"%2td %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
|
|
vif - mrt->vif_table,
|
|
name, vif->bytes_in, vif->pkt_in,
|
|
vif->bytes_out, vif->pkt_out,
|
|
vif->flags, vif->local, vif->remote);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations ipmr_vif_seq_ops = {
|
|
.start = ipmr_vif_seq_start,
|
|
.next = mr_vif_seq_next,
|
|
.stop = ipmr_vif_seq_stop,
|
|
.show = ipmr_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 = ipmr_get_table(net, RT_TABLE_DEFAULT);
|
|
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 mfc_cache *mfc = v;
|
|
const struct mr_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->_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_IP_PIMSM_V2
|
|
static const struct net_protocol pim_protocol = {
|
|
.handler = pim_rcv,
|
|
};
|
|
#endif
|
|
|
|
static unsigned int ipmr_seq_read(struct net *net)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net);
|
|
}
|
|
|
|
static int ipmr_dump(struct net *net, struct notifier_block *nb,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump,
|
|
ipmr_mr_table_iter, extack);
|
|
}
|
|
|
|
static const struct fib_notifier_ops ipmr_notifier_ops_template = {
|
|
.family = RTNL_FAMILY_IPMR,
|
|
.fib_seq_read = ipmr_seq_read,
|
|
.fib_dump = ipmr_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __net_init ipmr_notifier_init(struct net *net)
|
|
{
|
|
struct fib_notifier_ops *ops;
|
|
|
|
net->ipv4.ipmr_seq = 0;
|
|
|
|
ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);
|
|
if (IS_ERR(ops))
|
|
return PTR_ERR(ops);
|
|
net->ipv4.ipmr_notifier_ops = ops;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit ipmr_notifier_exit(struct net *net)
|
|
{
|
|
fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);
|
|
net->ipv4.ipmr_notifier_ops = NULL;
|
|
}
|
|
|
|
/* Setup for IP multicast routing */
|
|
static int __net_init ipmr_net_init(struct net *net)
|
|
{
|
|
int err;
|
|
|
|
err = ipmr_notifier_init(net);
|
|
if (err)
|
|
goto ipmr_notifier_fail;
|
|
|
|
err = ipmr_rules_init(net);
|
|
if (err < 0)
|
|
goto ipmr_rules_fail;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
err = -ENOMEM;
|
|
if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops,
|
|
sizeof(struct mr_vif_iter)))
|
|
goto proc_vif_fail;
|
|
if (!proc_create_net("ip_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("ip_mr_vif", net->proc_net);
|
|
proc_vif_fail:
|
|
rtnl_lock();
|
|
ipmr_rules_exit(net);
|
|
rtnl_unlock();
|
|
#endif
|
|
ipmr_rules_fail:
|
|
ipmr_notifier_exit(net);
|
|
ipmr_notifier_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_notifier_exit(net);
|
|
}
|
|
|
|
static void __net_exit ipmr_net_exit_batch(struct list_head *net_list)
|
|
{
|
|
struct net *net;
|
|
|
|
rtnl_lock();
|
|
list_for_each_entry(net, net_list, exit_list)
|
|
ipmr_rules_exit(net);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations ipmr_net_ops = {
|
|
.init = ipmr_net_init,
|
|
.exit = ipmr_net_exit,
|
|
.exit_batch = ipmr_net_exit_batch,
|
|
};
|
|
|
|
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);
|
|
|
|
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,
|
|
ipmr_rtm_getroute, ipmr_rtm_dumproute, 0);
|
|
rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
|
|
ipmr_rtm_route, NULL, 0);
|
|
rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
|
|
ipmr_rtm_route, NULL, 0);
|
|
|
|
rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK,
|
|
NULL, ipmr_rtm_dumplink, 0);
|
|
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;
|
|
}
|