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netns: ip6mr: allocate mroute6_socket per-namespace.

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Preliminary work to make IPv6 multicast forwarding netns-aware.

Make IPv6 multicast forwarding mroute6_socket per-namespace,
moves it into struct netns_ipv6.

At the moment, mroute6_socket is only referenced in init_net.

Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Benjamin Thery 2008-12-10 16:07:08 -08:00 committed by David S. Miller
parent 5eaa65b240
commit bd91b8bf37
4 changed files with 21 additions and 15 deletions
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8
include/linux/mroute6.h
View File

@ -117,6 +117,7 @@ struct sioc_mif_req6
#include <linux/pim.h>
#include <linux/skbuff.h> /* for struct sk_buff_head */
#include <net/net_namespace.h>
#ifdef CONFIG_IPV6_MROUTE
static inline int ip6_mroute_opt(int opt)
@ -232,10 +233,13 @@ struct rtmsg;
extern int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait);
#ifdef CONFIG_IPV6_MROUTE
extern struct sock *mroute6_socket;
static inline struct sock *mroute6_socket(struct net *net)
{
return net->ipv6.mroute6_sk;
}
extern int ip6mr_sk_done(struct sock *sk);
#else
#define mroute6_socket NULL
static inline struct sock *mroute6_socket(struct net *net) { return NULL; }
static inline int ip6mr_sk_done(struct sock *sk) { return 0; }
#endif
#endif

3
include/net/netns/ipv6.h
View File

@ -55,5 +55,8 @@ struct netns_ipv6 {
struct sock *ndisc_sk;
struct sock *tcp_sk;
struct sock *igmp_sk;
#ifdef CONFIG_IPV6_MROUTE
struct sock *mroute6_sk;
#endif
};
#endif

3
net/ipv6/ip6_output.c
View File

@ -137,7 +137,8 @@ static int ip6_output2(struct sk_buff *skb)
struct inet6_dev *idev = ip6_dst_idev(skb->dst);
if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) &&
((mroute6_socket && !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
((mroute6_socket(dev_net(dev)) &&
!(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
&ipv6_hdr(skb)->saddr))) {
struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);

22
net/ipv6/ip6mr.c
View File

@ -49,9 +49,6 @@
#include <net/addrconf.h>
#include <linux/netfilter_ipv6.h>
struct sock *mroute6_socket;
/* Big lock, protecting vif table, mrt cache and mroute socket state.
Note that the changes are semaphored via rtnl_lock.
*/
@ -820,7 +817,7 @@ static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert)
skb_pull(skb, sizeof(struct ipv6hdr));
}
if (mroute6_socket == NULL) {
if (init_net.ipv6.mroute6_sk == NULL) {
kfree_skb(skb);
return -EINVAL;
}
@ -828,7 +825,8 @@ static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert)
/*
* Deliver to user space multicast routing algorithms
*/
if ((ret = sock_queue_rcv_skb(mroute6_socket, skb)) < 0) {
ret = sock_queue_rcv_skb(init_net.ipv6.mroute6_sk, skb);
if (ret < 0) {
if (net_ratelimit())
printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n");
kfree_skb(skb);
@ -1145,8 +1143,8 @@ static int ip6mr_sk_init(struct sock *sk)
rtnl_lock();
write_lock_bh(&mrt_lock);
if (likely(mroute6_socket == NULL))
mroute6_socket = sk;
if (likely(init_net.ipv6.mroute6_sk == NULL))
init_net.ipv6.mroute6_sk = sk;
else
err = -EADDRINUSE;
write_unlock_bh(&mrt_lock);
@ -1161,9 +1159,9 @@ int ip6mr_sk_done(struct sock *sk)
int err = 0;
rtnl_lock();
if (sk == mroute6_socket) {
if (sk == init_net.ipv6.mroute6_sk) {
write_lock_bh(&mrt_lock);
mroute6_socket = NULL;
init_net.ipv6.mroute6_sk = NULL;
write_unlock_bh(&mrt_lock);
mroute_clean_tables(sk);
@ -1189,7 +1187,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int
mifi_t mifi;
if (optname != MRT6_INIT) {
if (sk != mroute6_socket && !capable(CAP_NET_ADMIN))
if (sk != init_net.ipv6.mroute6_sk && !capable(CAP_NET_ADMIN))
return -EACCES;
}
@ -1214,7 +1212,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int
if (vif.mif6c_mifi >= MAXMIFS)
return -ENFILE;
rtnl_lock();
ret = mif6_add(&vif, sk == mroute6_socket);
ret = mif6_add(&vif, sk == init_net.ipv6.mroute6_sk);
rtnl_unlock();
return ret;
@ -1242,7 +1240,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int
if (optname == MRT6_DEL_MFC)
ret = ip6mr_mfc_delete(&mfc);
else
ret = ip6mr_mfc_add(&mfc, sk == mroute6_socket);
ret = ip6mr_mfc_add(&mfc, sk == init_net.ipv6.mroute6_sk);
rtnl_unlock();
return ret;