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ip6mr.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Linux IPv6 multicast routing support for BSD pim6sd
* Based on net/ipv4/ipmr.c.
*
* (c) 2004 Mickael Hoerdt, <[email protected]>
* LSIIT Laboratory, Strasbourg, France
* (c) 2004 Jean-Philippe Andriot, <[email protected]>
* 6WIND, Paris, France
* Copyright (C)2007,2008 USAGI/WIDE Project
* YOSHIFUJI Hideaki <[email protected]>
*/
#include <linux/uaccess.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/socket.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/compat.h>
#include <linux/rhashtable.h>
#include <net/protocol.h>
#include <linux/skbuff.h>
#include <net/raw.h>
#include <linux/notifier.h>
#include <linux/if_arp.h>
#include <net/checksum.h>
#include <net/netlink.h>
#include <net/fib_rules.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <linux/mroute6.h>
#include <linux/pim.h>
#include <net/addrconf.h>
#include <linux/netfilter_ipv6.h>
#include <linux/export.h>
#include <net/ip6_checksum.h>
#include <linux/netconf.h>
#include <net/ip_tunnels.h>
#include <linux/nospec.h>
struct ip6mr_rule {
struct fib_rule common;
};
struct ip6mr_result {
struct mr_table *mrt;
};
/* Big lock, protecting vif table, mrt cache and mroute socket state.
Note that the changes are semaphored via rtnl_lock.
*/
static DEFINE_RWLOCK(mrt_lock);
/* Multicast router control variables */
/* Special spinlock for queue of unresolved entries */
static DEFINE_SPINLOCK(mfc_unres_lock);
/* We return to original Alan's scheme. Hash table of resolved
entries is changed only in process context and protected
with weak lock mrt_lock. Queue of unresolved entries is protected
with strong spinlock mfc_unres_lock.
In this case data path is free of exclusive locks at all.
*/
static struct kmem_cache *mrt_cachep __read_mostly;
static struct mr_table *ip6mr_new_table(struct net *net, u32 id);
static void ip6mr_free_table(struct mr_table *mrt);
static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
struct net_device *dev, struct sk_buff *skb,
struct mfc6_cache *cache);
static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
mifi_t mifi, int assert);
static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
int cmd);
static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
static int ip6mr_rtm_dumproute(struct sk_buff *skb,
struct netlink_callback *cb);
static void mroute_clean_tables(struct mr_table *mrt, int flags);
static void ipmr_expire_process(struct timer_list *t);
#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
#define ip6mr_for_each_table(mrt, net) \
list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list, \
lockdep_rtnl_is_held() || \
list_empty(&net->ipv6.mr6_tables))
static struct mr_table *ip6mr_mr_table_iter(struct net *net,
struct mr_table *mrt)
{
struct mr_table *ret;
if (!mrt)
ret = list_entry_rcu(net->ipv6.mr6_tables.next,
struct mr_table, list);
else
ret = list_entry_rcu(mrt->list.next,
struct mr_table, list);
if (&ret->list == &net->ipv6.mr6_tables)
return NULL;
return ret;
}
static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
{
struct mr_table *mrt;
ip6mr_for_each_table(mrt, net) {
if (mrt->id == id)
return mrt;
}
return NULL;
}
static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
struct mr_table **mrt)
{
int err;
struct ip6mr_result res;
struct fib_lookup_arg arg = {
.result = &res,
.flags = FIB_LOOKUP_NOREF,
};
/* update flow if oif or iif point to device enslaved to l3mdev */
l3mdev_update_flow(net, flowi6_to_flowi(flp6));
err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
flowi6_to_flowi(flp6), 0, &arg);
if (err < 0)
return err;
*mrt = res.mrt;
return 0;
}
static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
int flags, struct fib_lookup_arg *arg)
{
struct ip6mr_result *res = arg->result;
struct mr_table *mrt;
switch (rule->action) {
case FR_ACT_TO_TBL:
break;
case FR_ACT_UNREACHABLE:
return -ENETUNREACH;
case FR_ACT_PROHIBIT:
return -EACCES;
case FR_ACT_BLACKHOLE:
default:
return -EINVAL;
}
arg->table = fib_rule_get_table(rule, arg);
mrt = ip6mr_get_table(rule->fr_net, arg->table);
if (!mrt)
return -EAGAIN;
res->mrt = mrt;
return 0;
}
static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
{
return 1;
}
static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
FRA_GENERIC_POLICY,
};
static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
struct fib_rule_hdr *frh, struct nlattr **tb,
struct netlink_ext_ack *extack)
{
return 0;
}
static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
struct nlattr **tb)
{
return 1;
}
static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
struct fib_rule_hdr *frh)
{
frh->dst_len = 0;
frh->src_len = 0;
frh->tos = 0;
return 0;
}
static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
.family = RTNL_FAMILY_IP6MR,
.rule_size = sizeof(struct ip6mr_rule),
.addr_size = sizeof(struct in6_addr),
.action = ip6mr_rule_action,
.match = ip6mr_rule_match,
.configure = ip6mr_rule_configure,
.compare = ip6mr_rule_compare,
.fill = ip6mr_rule_fill,
.nlgroup = RTNLGRP_IPV6_RULE,
.policy = ip6mr_rule_policy,
.owner = THIS_MODULE,
};
static int __net_init ip6mr_rules_init(struct net *net)
{
struct fib_rules_ops *ops;
struct mr_table *mrt;
int err;
ops = fib_rules_register(&ip6mr_rules_ops_template, net);
if (IS_ERR(ops))
return PTR_ERR(ops);
INIT_LIST_HEAD(&net->ipv6.mr6_tables);
mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
if (IS_ERR(mrt)) {
err = PTR_ERR(mrt);
goto err1;
}
err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
if (err < 0)
goto err2;
net->ipv6.mr6_rules_ops = ops;
return 0;
err2:
ip6mr_free_table(mrt);
err1:
fib_rules_unregister(ops);
return err;
}
static void __net_exit ip6mr_rules_exit(struct net *net)
{
struct mr_table *mrt, *next;
rtnl_lock();
list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
list_del(&mrt->list);
ip6mr_free_table(mrt);
}
fib_rules_unregister(net->ipv6.mr6_rules_ops);
rtnl_unlock();
}
static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
struct netlink_ext_ack *extack)
{
return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR, extack);
}
static unsigned int ip6mr_rules_seq_read(struct net *net)
{
return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR);
}
bool ip6mr_rule_default(const struct fib_rule *rule)
{
return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
}
EXPORT_SYMBOL(ip6mr_rule_default);
#else
#define ip6mr_for_each_table(mrt, net) \
for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
static struct mr_table *ip6mr_mr_table_iter(struct net *net,
struct mr_table *mrt)
{
if (!mrt)
return net->ipv6.mrt6;
return NULL;
}
static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
{
return net->ipv6.mrt6;
}
static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
struct mr_table **mrt)
{
*mrt = net->ipv6.mrt6;
return 0;
}
static int __net_init ip6mr_rules_init(struct net *net)
{
struct mr_table *mrt;
mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
if (IS_ERR(mrt))
return PTR_ERR(mrt);
net->ipv6.mrt6 = mrt;
return 0;
}
static void __net_exit ip6mr_rules_exit(struct net *net)
{
rtnl_lock();
ip6mr_free_table(net->ipv6.mrt6);
net->ipv6.mrt6 = NULL;
rtnl_unlock();
}
static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
struct netlink_ext_ack *extack)
{
return 0;
}
static unsigned int ip6mr_rules_seq_read(struct net *net)
{
return 0;
}
#endif
static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg,
const void *ptr)
{
const struct mfc6_cache_cmp_arg *cmparg = arg->key;
struct mfc6_cache *c = (struct mfc6_cache *)ptr;
return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) ||
!ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin);
}
static const struct rhashtable_params ip6mr_rht_params = {
.head_offset = offsetof(struct mr_mfc, mnode),
.key_offset = offsetof(struct mfc6_cache, cmparg),
.key_len = sizeof(struct mfc6_cache_cmp_arg),
.nelem_hint = 3,
.obj_cmpfn = ip6mr_hash_cmp,
.automatic_shrinking = true,
};
static void ip6mr_new_table_set(struct mr_table *mrt,
struct net *net)
{
#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
#endif
}
static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = {
.mf6c_origin = IN6ADDR_ANY_INIT,
.mf6c_mcastgrp = IN6ADDR_ANY_INIT,
};
static struct mr_table_ops ip6mr_mr_table_ops = {
.rht_params = &ip6mr_rht_params,
.cmparg_any = &ip6mr_mr_table_ops_cmparg_any,
};
static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
{
struct mr_table *mrt;
mrt = ip6mr_get_table(net, id);
if (mrt)
return mrt;
return mr_table_alloc(net, id, &ip6mr_mr_table_ops,
ipmr_expire_process, ip6mr_new_table_set);
}
static void ip6mr_free_table(struct mr_table *mrt)
{
del_timer_sync(&mrt->ipmr_expire_timer);
mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC |
MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC);
rhltable_destroy(&mrt->mfc_hash);
kfree(mrt);
}
#ifdef CONFIG_PROC_FS
/* The /proc interfaces to multicast routing
* /proc/ip6_mr_cache /proc/ip6_mr_vif
*/
static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(mrt_lock)
{
struct mr_vif_iter *iter = seq->private;
struct net *net = seq_file_net(seq);
struct mr_table *mrt;
mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
if (!mrt)
return ERR_PTR(-ENOENT);
iter->mrt = mrt;
read_lock(&mrt_lock);
return mr_vif_seq_start(seq, pos);
}
static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
__releases(mrt_lock)
{
read_unlock(&mrt_lock);
}
static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
{
struct mr_vif_iter *iter = seq->private;
struct mr_table *mrt = iter->mrt;
if (v == SEQ_START_TOKEN) {
seq_puts(seq,
"Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
} else {
const struct vif_device *vif = v;
const char *name = vif->dev ? vif->dev->name : "none";
seq_printf(seq,
"%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
vif - mrt->vif_table,
name, vif->bytes_in, vif->pkt_in,
vif->bytes_out, vif->pkt_out,
vif->flags);
}
return 0;
}
static const struct seq_operations ip6mr_vif_seq_ops = {
.start = ip6mr_vif_seq_start,
.next = mr_vif_seq_next,
.stop = ip6mr_vif_seq_stop,
.show = ip6mr_vif_seq_show,
};
static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
{
struct net *net = seq_file_net(seq);
struct mr_table *mrt;
mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
if (!mrt)
return ERR_PTR(-ENOENT);
return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
}
static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
{
int n;
if (v == SEQ_START_TOKEN) {
seq_puts(seq,
"Group "
"Origin "
"Iif Pkts Bytes Wrong Oifs\n");
} else {
const struct mfc6_cache *mfc = v;
const struct mr_mfc_iter *it = seq->private;
struct mr_table *mrt = it->mrt;
seq_printf(seq, "%pI6 %pI6 %-3hd",
&mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
mfc->_c.mfc_parent);
if (it->cache != &mrt->mfc_unres_queue) {
seq_printf(seq, " %8lu %8lu %8lu",
mfc->_c.mfc_un.res.pkt,
mfc->_c.mfc_un.res.bytes,
mfc->_c.mfc_un.res.wrong_if);
for (n = mfc->_c.mfc_un.res.minvif;
n < mfc->_c.mfc_un.res.maxvif; n++) {
if (VIF_EXISTS(mrt, n) &&
mfc->_c.mfc_un.res.ttls[n] < 255)
seq_printf(seq,
" %2d:%-3d", n,
mfc->_c.mfc_un.res.ttls[n]);
}
} else {
/* unresolved mfc_caches don't contain
* pkt, bytes and wrong_if values
*/
seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
}
seq_putc(seq, '\n');
}
return 0;
}
static const struct seq_operations ipmr_mfc_seq_ops = {
.start = ipmr_mfc_seq_start,
.next = mr_mfc_seq_next,
.stop = mr_mfc_seq_stop,
.show = ipmr_mfc_seq_show,
};
#endif
#ifdef CONFIG_IPV6_PIMSM_V2
static int pim6_rcv(struct sk_buff *skb)
{
struct pimreghdr *pim;
struct ipv6hdr *encap;
struct net_device *reg_dev = NULL;
struct net *net = dev_net(skb->dev);
struct mr_table *mrt;
struct flowi6 fl6 = {
.flowi6_iif = skb->dev->ifindex,
.flowi6_mark = skb->mark,
};
int reg_vif_num;
if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
goto drop;
pim = (struct pimreghdr *)skb_transport_header(skb);
if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) ||
(pim->flags & PIM_NULL_REGISTER) ||
(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
sizeof(*pim), IPPROTO_PIM,
csum_partial((void *)pim, sizeof(*pim), 0)) &&
csum_fold(skb_checksum(skb, 0, skb->len, 0))))
goto drop;
/* check if the inner packet is destined to mcast group */
encap = (struct ipv6hdr *)(skb_transport_header(skb) +
sizeof(*pim));
if (!ipv6_addr_is_multicast(&encap->daddr) ||
encap->payload_len == 0 ||
ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
goto drop;
if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
goto drop;
reg_vif_num = mrt->mroute_reg_vif_num;
read_lock(&mrt_lock);
if (reg_vif_num >= 0)
reg_dev = mrt->vif_table[reg_vif_num].dev;
dev_hold(reg_dev);
read_unlock(&mrt_lock);
if (!reg_dev)
goto drop;
skb->mac_header = skb->network_header;
skb_pull(skb, (u8 *)encap - skb->data);
skb_reset_network_header(skb);
skb->protocol = htons(ETH_P_IPV6);
skb->ip_summed = CHECKSUM_NONE;
skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
netif_rx(skb);
dev_put(reg_dev);
return 0;
drop:
kfree_skb(skb);
return 0;
}
static const struct inet6_protocol pim6_protocol = {
.handler = pim6_rcv,
};
/* Service routines creating virtual interfaces: PIMREG */
static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct net *net = dev_net(dev);
struct mr_table *mrt;
struct flowi6 fl6 = {
.flowi6_oif = dev->ifindex,
.flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
.flowi6_mark = skb->mark,
};
if (!pskb_inet_may_pull(skb))
goto tx_err;
if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
goto tx_err;
read_lock(&mrt_lock);
dev->stats.tx_bytes += skb->len;
dev->stats.tx_packets++;
ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
read_unlock(&mrt_lock);
kfree_skb(skb);
return NETDEV_TX_OK;
tx_err:
dev->stats.tx_errors++;
kfree_skb(skb);
return NETDEV_TX_OK;
}
static int reg_vif_get_iflink(const struct net_device *dev)
{
return 0;
}
static const struct net_device_ops reg_vif_netdev_ops = {
.ndo_start_xmit = reg_vif_xmit,
.ndo_get_iflink = reg_vif_get_iflink,
};
static void reg_vif_setup(struct net_device *dev)
{
dev->type = ARPHRD_PIMREG;
dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
dev->flags = IFF_NOARP;
dev->netdev_ops = ®_vif_netdev_ops;
dev->needs_free_netdev = true;
dev->features |= NETIF_F_NETNS_LOCAL;
}
static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt)
{
struct net_device *dev;
char name[IFNAMSIZ];
if (mrt->id == RT6_TABLE_DFLT)
sprintf(name, "pim6reg");
else
sprintf(name, "pim6reg%u", mrt->id);
dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
if (!dev)
return NULL;
dev_net_set(dev, net);
if (register_netdevice(dev)) {
free_netdev(dev);
return NULL;
}
if (dev_open(dev, NULL))
goto failure;
dev_hold(dev);
return dev;
failure:
unregister_netdevice(dev);
return NULL;
}
#endif
static int call_ip6mr_vif_entry_notifiers(struct net *net,
enum fib_event_type event_type,
struct vif_device *vif,
mifi_t vif_index, u32 tb_id)
{
return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
vif, vif_index, tb_id,
&net->ipv6.ipmr_seq);
}
static int call_ip6mr_mfc_entry_notifiers(struct net *net,
enum fib_event_type event_type,
struct mfc6_cache *mfc, u32 tb_id)
{
return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
&mfc->_c, tb_id, &net->ipv6.ipmr_seq);
}
/* Delete a VIF entry */
static int mif6_delete(struct mr_table *mrt, int vifi, int notify,
struct list_head *head)
{
struct vif_device *v;
struct net_device *dev;
struct inet6_dev *in6_dev;
if (vifi < 0 || vifi >= mrt->maxvif)
return -EADDRNOTAVAIL;
v = &mrt->vif_table[vifi];
if (VIF_EXISTS(mrt, vifi))
call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->net),
FIB_EVENT_VIF_DEL, v, vifi,
mrt->id);
write_lock_bh(&mrt_lock);
dev = v->dev;
v->dev = NULL;
if (!dev) {
write_unlock_bh(&mrt_lock);
return -EADDRNOTAVAIL;
}
#ifdef CONFIG_IPV6_PIMSM_V2
if (vifi == mrt->mroute_reg_vif_num)
mrt->mroute_reg_vif_num = -1;
#endif
if (vifi + 1 == mrt->maxvif) {
int tmp;
for (tmp = vifi - 1; tmp >= 0; tmp--) {
if (VIF_EXISTS(mrt, tmp))
break;
}
mrt->maxvif = tmp + 1;
}
write_unlock_bh(&mrt_lock);
dev_set_allmulti(dev, -1);
in6_dev = __in6_dev_get(dev);
if (in6_dev) {
in6_dev->cnf.mc_forwarding--;
inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
NETCONFA_MC_FORWARDING,
dev->ifindex, &in6_dev->cnf);
}
if ((v->flags & MIFF_REGISTER) && !notify)
unregister_netdevice_queue(dev, head);
dev_put(dev);
return 0;
}
static inline void ip6mr_cache_free_rcu(struct rcu_head *head)
{
struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c);
}
static inline void ip6mr_cache_free(struct mfc6_cache *c)
{
call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu);
}
/* Destroy an unresolved cache entry, killing queued skbs
and reporting error to netlink readers.
*/
static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c)
{
struct net *net = read_pnet(&mrt->net);
struct sk_buff *skb;
atomic_dec(&mrt->cache_resolve_queue_len);
while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) {
if (ipv6_hdr(skb)->version == 0) {
struct nlmsghdr *nlh = skb_pull(skb,
sizeof(struct ipv6hdr));
nlh->nlmsg_type = NLMSG_ERROR;
nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
skb_trim(skb, nlh->nlmsg_len);
((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
} else
kfree_skb(skb);
}
ip6mr_cache_free(c);
}
/* Timer process for all the unresolved queue. */
static void ipmr_do_expire_process(struct mr_table *mrt)
{
unsigned long now = jiffies;
unsigned long expires = 10 * HZ;
struct mr_mfc *c, *next;
list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
if (time_after(c->mfc_un.unres.expires, now)) {
/* not yet... */
unsigned long interval = c->mfc_un.unres.expires - now;
if (interval < expires)
expires = interval;
continue;
}
list_del(&c->list);
mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
}
if (!list_empty(&mrt->mfc_unres_queue))
mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
}
static void ipmr_expire_process(struct timer_list *t)
{
struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
if (!spin_trylock(&mfc_unres_lock)) {
mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
return;
}
if (!list_empty(&mrt->mfc_unres_queue))
ipmr_do_expire_process(mrt);
spin_unlock(&mfc_unres_lock);
}
/* Fill oifs list. It is called under write locked mrt_lock. */
static void ip6mr_update_thresholds(struct mr_table *mrt,
struct mr_mfc *cache,
unsigned char *ttls)
{
int vifi;
cache->mfc_un.res.minvif = MAXMIFS;
cache->mfc_un.res.maxvif = 0;
memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
for (vifi = 0; vifi < mrt->maxvif; vifi++) {
if (VIF_EXISTS(mrt, vifi) &&
ttls[vifi] && ttls[vifi] < 255) {
cache->mfc_un.res.ttls[vifi] = ttls[vifi];
if (cache->mfc_un.res.minvif > vifi)
cache->mfc_un.res.minvif = vifi;
if (cache->mfc_un.res.maxvif <= vifi)
cache->mfc_un.res.maxvif = vifi + 1;
}
}
cache->mfc_un.res.lastuse = jiffies;
}
static int mif6_add(struct net *net, struct mr_table *mrt,
struct mif6ctl *vifc, int mrtsock)
{
int vifi = vifc->mif6c_mifi;
struct vif_device *v = &mrt->vif_table[vifi];
struct net_device *dev;
struct inet6_dev *in6_dev;
int err;
/* Is vif busy ? */
if (VIF_EXISTS(mrt, vifi))
return -EADDRINUSE;
switch (vifc->mif6c_flags) {
#ifdef CONFIG_IPV6_PIMSM_V2
case MIFF_REGISTER:
/*
* Special Purpose VIF in PIM
* All the packets will be sent to the daemon
*/
if (mrt->mroute_reg_vif_num >= 0)
return -EADDRINUSE;
dev = ip6mr_reg_vif(net, mrt);
if (!dev)
return -ENOBUFS;
err = dev_set_allmulti(dev, 1);
if (err) {
unregister_netdevice(dev);
dev_put(dev);
return err;
}
break;
#endif
case 0:
dev = dev_get_by_index(net, vifc->mif6c_pifi);
if (!dev)
return -EADDRNOTAVAIL;
err = dev_set_allmulti(dev, 1);
if (err) {
dev_put(dev);
return err;
}
break;
default:
return -EINVAL;
}
in6_dev = __in6_dev_get(dev);
if (in6_dev) {
in6_dev->cnf.mc_forwarding++;
inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
NETCONFA_MC_FORWARDING,
dev->ifindex, &in6_dev->cnf);
}
/* Fill in the VIF structures */
vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold,
vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0),
MIFF_REGISTER);
/* And finish update writing critical data */
write_lock_bh(&mrt_lock);
v->dev = dev;
#ifdef CONFIG_IPV6_PIMSM_V2
if (v->flags & MIFF_REGISTER)
mrt->mroute_reg_vif_num = vifi;
#endif
if (vifi + 1 > mrt->maxvif)
mrt->maxvif = vifi + 1;
write_unlock_bh(&mrt_lock);
call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD,
v, vifi, mrt->id);
return 0;
}
static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt,
const struct in6_addr *origin,
const struct in6_addr *mcastgrp)
{
struct mfc6_cache_cmp_arg arg = {
.mf6c_origin = *origin,
.mf6c_mcastgrp = *mcastgrp,
};
return mr_mfc_find(mrt, &arg);
}
/* Look for a (*,G) entry */
static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt,
struct in6_addr *mcastgrp,
mifi_t mifi)
{
struct mfc6_cache_cmp_arg arg = {
.mf6c_origin = in6addr_any,
.mf6c_mcastgrp = *mcastgrp,
};
if (ipv6_addr_any(mcastgrp))
return mr_mfc_find_any_parent(mrt, mifi);
return mr_mfc_find_any(mrt, mifi, &arg);
}
/* Look for a (S,G,iif) entry if parent != -1 */
static struct mfc6_cache *
ip6mr_cache_find_parent(struct mr_table *mrt,
const struct in6_addr *origin,
const struct in6_addr *mcastgrp,
int parent)
{
struct mfc6_cache_cmp_arg arg = {
.mf6c_origin = *origin,
.mf6c_mcastgrp = *mcastgrp,
};
return mr_mfc_find_parent(mrt, &arg, parent);
}
/* Allocate a multicast cache entry */
static struct mfc6_cache *ip6mr_cache_alloc(void)
{
struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
if (!c)
return NULL;
c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
c->_c.mfc_un.res.minvif = MAXMIFS;
c->_c.free = ip6mr_cache_free_rcu;
refcount_set(&c->_c.mfc_un.res.refcount, 1);
return c;
}
static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
{
struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
if (!c)
return NULL;
skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
return c;
}
/*
* A cache entry has gone into a resolved state from queued