[PATCH net-2.6.25 15/19] [NETNS] Provide correct namespace for fibnl netlink socket.
From: Denis V. Lunev <hidden>
Date: 2007-12-19 15:23:01
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
Acked-by: Benjamin Thery <redacted> Signed-off-by: Denis V. Lunev <redacted> --- include/net/netns/ipv4.h | 2 ++ net/ipv4/fib_frontend.c | 26 ++++++++++++++++++-------- 2 files changed, 20 insertions(+), 8 deletions(-)
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 629ec6c..031d761 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h@@ -9,6 +9,7 @@ struct ctl_table_header; struct ipv4_devconf; struct fib_rules_ops; struct hlist_head; +struct sock; struct netns_ipv4 { struct ctl_table_header *forw_hdr;
@@ -18,5 +19,6 @@ struct netns_ipv4 { struct fib_rules_ops *rules_ops; #endif struct hlist_head *fib_table_hash; + struct sock *fibnl; }; #endif
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 2e150ae..abe9f43 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c@@ -49,8 +49,6 @@ #define FFprint(a...) printk(KERN_DEBUG a) -static struct sock *fibnl; - #ifndef CONFIG_IP_MULTIPLE_TABLES static int __net_init fib4_rules_init(struct net *net)
@@ -845,11 +843,13 @@ static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) static void nl_fib_input(struct sk_buff *skb) { + struct net *net; struct fib_result_nl *frn; struct nlmsghdr *nlh; struct fib_table *tb; u32 pid; + net = skb->sk->sk_net; nlh = nlmsg_hdr(skb); if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) {
@@ -858,26 +858,36 @@ static void nl_fib_input(struct sk_buff *skb) } frn = (struct fib_result_nl *) NLMSG_DATA(nlh); - tb = fib_get_table(&init_net, frn->tb_id_in); + tb = fib_get_table(net, frn->tb_id_in); nl_fib_lookup(frn, tb); pid = NETLINK_CB(skb).pid; /* pid of sending process */ NETLINK_CB(skb).pid = 0; /* from kernel */ NETLINK_CB(skb).dst_group = 0; /* unicast */ - netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT); + netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); } static int nl_fib_lookup_init(struct net *net) { - fibnl = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, - nl_fib_input, NULL, THIS_MODULE); - return fibnl != NULL ? 0 : -EAFNOSUPPORT; + struct sock *sk; + sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, + nl_fib_input, NULL, THIS_MODULE); + if (sk == NULL) + return -EAFNOSUPPORT; + /* Don't hold an extra reference on the namespace */ + put_net(sk->sk_net); + net->ipv4.fibnl = sk; + return 0; } static void nl_fib_lookup_exit(struct net *net) { - sock_put(fibnl); + /* At the last minute lie and say this is a socket for the + * initial network namespace. So the socket will be safe to free. + */ + net->ipv4.fibnl->sk_net = get_net(&init_net); + sock_put(net->ipv4.fibnl); } static void fib_disable_ip(struct net_device *dev, int force)
--
1.5.3.rc5