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Message-Id: <20080528125137.228283589@theryb.frec.bull.fr>
Date: Wed, 28 May 2008 14:51:24 +0200
From: Benjamin Thery <benjamin.thery@...l.net>
To: David Miller <davem@...emloft.net>, yoshfuji@...ux-ipv6.org
Cc: netdev@...r.kernel.org, Benjamin Thery <benjamin.thery@...l.net>
Subject: [PATCH net-next] IPv6 address labels per namespace - v2
This pacth makes IPv6 address labels per network namespace.
It keeps the global label tables, ip6addrlbl_table, but
adds a 'net' member to each ip6addrlbl_entry.
This new member is taken into account when matching labels.
Changelog
=========
* v1: Initial version
* v2:
* Minize the penalty when network namespaces are not configured:
* the 'net' member is added only if CONFIG_NET_NS is
defined. This saves space when network namespaces are not
configured.
* 'net' value is retrieved with the inlined function
ip6addrlbl_net() that always return &init_net when
CONFIG_NET_NS is not defined.
* 'net' member in ip6addrlbl_entry renamed to the less generic
'lbl_net' name (helps code search).
Signed-off-by: Benjamin Thery <benjamin.thery@...l.net>
---
include/net/addrconf.h | 3 -
net/ipv6/addrconf.c | 12 +++--
net/ipv6/addrlabel.c | 106 ++++++++++++++++++++++++++++++++++---------------
3 files changed, 84 insertions(+), 37 deletions(-)
Index: net-next-2.6/include/net/addrconf.h
===================================================================
--- net-next-2.6.orig/include/net/addrconf.h
+++ net-next-2.6/include/net/addrconf.h
@@ -99,7 +99,8 @@ extern void addrconf_leave_solict(stru
*/
extern int ipv6_addr_label_init(void);
extern void ipv6_addr_label_rtnl_register(void);
-extern u32 ipv6_addr_label(const struct in6_addr *addr,
+extern u32 ipv6_addr_label(struct net *net,
+ const struct in6_addr *addr,
int type, int ifindex);
/*
Index: net-next-2.6/net/ipv6/addrconf.c
===================================================================
--- net-next-2.6.orig/net/ipv6/addrconf.c
+++ net-next-2.6/net/ipv6/addrconf.c
@@ -953,7 +953,8 @@ static inline int ipv6_saddr_preferred(i
return 0;
}
-static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
+static int ipv6_get_saddr_eval(struct net *net,
+ struct ipv6_saddr_score *score,
struct ipv6_saddr_dst *dst,
int i)
{
@@ -1032,7 +1033,8 @@ static int ipv6_get_saddr_eval(struct ip
break;
case IPV6_SADDR_RULE_LABEL:
/* Rule 6: Prefer matching label */
- ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
+ ret = ipv6_addr_label(net,
+ &score->ifa->addr, score->addr_type,
score->ifa->idev->dev->ifindex) == dst->label;
break;
#ifdef CONFIG_IPV6_PRIVACY
@@ -1086,7 +1088,7 @@ int ipv6_dev_get_saddr(struct net_device
dst.addr = daddr;
dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
dst.scope = __ipv6_addr_src_scope(dst_type);
- dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
+ dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
dst.prefs = prefs;
hiscore->rule = -1;
@@ -1154,8 +1156,8 @@ int ipv6_dev_get_saddr(struct net_device
for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
int minihiscore, miniscore;
- minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
- miniscore = ipv6_get_saddr_eval(score, &dst, i);
+ minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
+ miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
if (minihiscore > miniscore) {
if (i == IPV6_SADDR_RULE_SCOPE &&
Index: net-next-2.6/net/ipv6/addrlabel.c
===================================================================
--- net-next-2.6.orig/net/ipv6/addrlabel.c
+++ net-next-2.6/net/ipv6/addrlabel.c
@@ -29,6 +29,9 @@
*/
struct ip6addrlbl_entry
{
+#ifdef CONFIG_NET_NS
+ struct net *lbl_net;
+#endif
struct in6_addr prefix;
int prefixlen;
int ifindex;
@@ -46,6 +49,16 @@ static struct ip6addrlbl_table
u32 seq;
} ip6addrlbl_table;
+static inline
+struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl)
+{
+#ifdef CONFIG_NET_NS
+ return lbl->lbl_net;
+#else
+ return &init_net;
+#endif
+}
+
/*
* Default policy table (RFC3484 + extensions)
*
@@ -65,7 +78,7 @@ static struct ip6addrlbl_table
#define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL
-static const __initdata struct ip6addrlbl_init_table
+static const __net_initdata struct ip6addrlbl_init_table
{
const struct in6_addr *prefix;
int prefixlen;
@@ -108,6 +121,9 @@ static const __initdata struct ip6addrlb
/* Object management */
static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p)
{
+#ifdef CONFIG_NET_NS
+ release_net(p->lbl_net);
+#endif
kfree(p);
}
@@ -128,10 +144,13 @@ static inline void ip6addrlbl_put(struct
}
/* Find label */
-static int __ip6addrlbl_match(struct ip6addrlbl_entry *p,
+static int __ip6addrlbl_match(struct net *net,
+ struct ip6addrlbl_entry *p,
const struct in6_addr *addr,
int addrtype, int ifindex)
{
+ if (!net_eq(ip6addrlbl_net(p), net))
+ return 0;
if (p->ifindex && p->ifindex != ifindex)
return 0;
if (p->addrtype && p->addrtype != addrtype)
@@ -141,19 +160,21 @@ static int __ip6addrlbl_match(struct ip6
return 1;
}
-static struct ip6addrlbl_entry *__ipv6_addr_label(const struct in6_addr *addr,
+static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
+ const struct in6_addr *addr,
int type, int ifindex)
{
struct hlist_node *pos;
struct ip6addrlbl_entry *p;
hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) {
- if (__ip6addrlbl_match(p, addr, type, ifindex))
+ if (__ip6addrlbl_match(net, p, addr, type, ifindex))
return p;
}
return NULL;
}
-u32 ipv6_addr_label(const struct in6_addr *addr, int type, int ifindex)
+u32 ipv6_addr_label(struct net *net,
+ const struct in6_addr *addr, int type, int ifindex)
{
u32 label;
struct ip6addrlbl_entry *p;
@@ -161,7 +182,7 @@ u32 ipv6_addr_label(const struct in6_add
type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK;
rcu_read_lock();
- p = __ipv6_addr_label(addr, type, ifindex);
+ p = __ipv6_addr_label(net, addr, type, ifindex);
label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
rcu_read_unlock();
@@ -174,7 +195,8 @@ u32 ipv6_addr_label(const struct in6_add
}
/* allocate one entry */
-static struct ip6addrlbl_entry *ip6addrlbl_alloc(const struct in6_addr *prefix,
+static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net,
+ const struct in6_addr *prefix,
int prefixlen, int ifindex,
u32 label)
{
@@ -216,6 +238,9 @@ static struct ip6addrlbl_entry *ip6addrl
newp->addrtype = addrtype;
newp->label = label;
INIT_HLIST_NODE(&newp->list);
+#ifdef CONFIG_NET_NS
+ newp->lbl_net = hold_net(net);
+#endif
atomic_set(&newp->refcnt, 1);
return newp;
}
@@ -237,6 +262,7 @@ static int __ip6addrlbl_add(struct ip6ad
hlist_for_each_entry_safe(p, pos, n,
&ip6addrlbl_table.head, list) {
if (p->prefixlen == newp->prefixlen &&
+ net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) &&
p->ifindex == newp->ifindex &&
ipv6_addr_equal(&p->prefix, &newp->prefix)) {
if (!replace) {
@@ -261,7 +287,8 @@ out:
}
/* add a label */
-static int ip6addrlbl_add(const struct in6_addr *prefix, int prefixlen,
+static int ip6addrlbl_add(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
int ifindex, u32 label, int replace)
{
struct ip6addrlbl_entry *newp;
@@ -274,7 +301,7 @@ static int ip6addrlbl_add(const struct i
(unsigned int)label,
replace);
- newp = ip6addrlbl_alloc(prefix, prefixlen, ifindex, label);
+ newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label);
if (IS_ERR(newp))
return PTR_ERR(newp);
spin_lock(&ip6addrlbl_table.lock);
@@ -286,7 +313,8 @@ static int ip6addrlbl_add(const struct i
}
/* remove a label */
-static int __ip6addrlbl_del(const struct in6_addr *prefix, int prefixlen,
+static int __ip6addrlbl_del(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
int ifindex)
{
struct ip6addrlbl_entry *p = NULL;
@@ -300,6 +328,7 @@ static int __ip6addrlbl_del(const struct
hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) {
if (p->prefixlen == prefixlen &&
+ net_eq(ip6addrlbl_net(p), net) &&
p->ifindex == ifindex &&
ipv6_addr_equal(&p->prefix, prefix)) {
hlist_del_rcu(&p->list);
@@ -311,7 +340,8 @@ static int __ip6addrlbl_del(const struct
return ret;
}
-static int ip6addrlbl_del(const struct in6_addr *prefix, int prefixlen,
+static int ip6addrlbl_del(struct net *net,
+ const struct in6_addr *prefix, int prefixlen,
int ifindex)
{
struct in6_addr prefix_buf;
@@ -324,13 +354,13 @@ static int ip6addrlbl_del(const struct i
ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
spin_lock(&ip6addrlbl_table.lock);
- ret = __ip6addrlbl_del(&prefix_buf, prefixlen, ifindex);
+ ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
spin_unlock(&ip6addrlbl_table.lock);
return ret;
}
/* add default label */
-static __init int ip6addrlbl_init(void)
+static int __net_init ip6addrlbl_net_init(struct net *net)
{
int err = 0;
int i;
@@ -338,7 +368,8 @@ static __init int ip6addrlbl_init(void)
ADDRLABEL(KERN_DEBUG "%s()\n", __func__);
for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
- int ret = ip6addrlbl_add(ip6addrlbl_init_table[i].prefix,
+ int ret = ip6addrlbl_add(net,
+ ip6addrlbl_init_table[i].prefix,
ip6addrlbl_init_table[i].prefixlen,
0,
ip6addrlbl_init_table[i].label, 0);
@@ -349,11 +380,32 @@ static __init int ip6addrlbl_init(void)
return err;
}
+static void __net_exit ip6addrlbl_net_exit(struct net *net)
+{
+ struct ip6addrlbl_entry *p = NULL;
+ struct hlist_node *pos, *n;
+
+ /* Remove all labels belonging to the exiting net */
+ spin_lock(&ip6addrlbl_table.lock);
+ hlist_for_each_entry_safe(p, pos, n, &ip6addrlbl_table.head, list) {
+ if (net_eq(ip6addrlbl_net(p), net)) {
+ hlist_del_rcu(&p->list);
+ ip6addrlbl_put(p);
+ }
+ }
+ spin_unlock(&ip6addrlbl_table.lock);
+}
+
+static struct pernet_operations ipv6_addr_label_ops = {
+ .init = ip6addrlbl_net_init,
+ .exit = ip6addrlbl_net_exit,
+};
+
int __init ipv6_addr_label_init(void)
{
spin_lock_init(&ip6addrlbl_table.lock);
- return ip6addrlbl_init();
+ return register_pernet_subsys(&ipv6_addr_label_ops);
}
static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
@@ -371,9 +423,6 @@ static int ip6addrlbl_newdel(struct sk_b
u32 label;
int err = 0;
- if (net != &init_net)
- return 0;
-
err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
if (err < 0)
return err;
@@ -385,7 +434,7 @@ static int ip6addrlbl_newdel(struct sk_b
return -EINVAL;
if (ifal->ifal_index &&
- !__dev_get_by_index(&init_net, ifal->ifal_index))
+ !__dev_get_by_index(net, ifal->ifal_index))
return -EINVAL;
if (!tb[IFAL_ADDRESS])
@@ -403,12 +452,12 @@ static int ip6addrlbl_newdel(struct sk_b
switch(nlh->nlmsg_type) {
case RTM_NEWADDRLABEL:
- err = ip6addrlbl_add(pfx, ifal->ifal_prefixlen,
+ err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
ifal->ifal_index, label,
nlh->nlmsg_flags & NLM_F_REPLACE);
break;
case RTM_DELADDRLABEL:
- err = ip6addrlbl_del(pfx, ifal->ifal_prefixlen,
+ err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
ifal->ifal_index);
break;
default:
@@ -458,12 +507,10 @@ static int ip6addrlbl_dump(struct sk_buf
int idx = 0, s_idx = cb->args[0];
int err;
- if (net != &init_net)
- return 0;
-
rcu_read_lock();
hlist_for_each_entry_rcu(p, pos, &ip6addrlbl_table.head, list) {
- if (idx >= s_idx) {
+ if (idx >= s_idx &&
+ net_eq(ip6addrlbl_net(p), net)) {
if ((err = ip6addrlbl_fill(skb, p,
ip6addrlbl_table.seq,
NETLINK_CB(cb->skb).pid,
@@ -499,9 +546,6 @@ static int ip6addrlbl_get(struct sk_buff
struct ip6addrlbl_entry *p;
struct sk_buff *skb;
- if (net != &init_net)
- return 0;
-
err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
if (err < 0)
return err;
@@ -513,7 +557,7 @@ static int ip6addrlbl_get(struct sk_buff
return -EINVAL;
if (ifal->ifal_index &&
- !__dev_get_by_index(&init_net, ifal->ifal_index))
+ !__dev_get_by_index(net, ifal->ifal_index))
return -EINVAL;
if (!tb[IFAL_ADDRESS])
@@ -524,7 +568,7 @@ static int ip6addrlbl_get(struct sk_buff
return -EINVAL;
rcu_read_lock();
- p = __ipv6_addr_label(addr, ipv6_addr_type(addr), ifal->ifal_index);
+ p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
if (p && ip6addrlbl_hold(p))
p = NULL;
lseq = ip6addrlbl_table.seq;
@@ -552,7 +596,7 @@ static int ip6addrlbl_get(struct sk_buff
goto out;
}
- err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
out:
return err;
}
--
--
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