[NETNS][IPV6] route6 - make route6 per namespace

This patch makes the routing engine use the network namespaces to
access routing informations: Add a network namespace parameter to
ipv6_route_ioctl and propagate the network namespace value to all the
routing code that have not yet been changed.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 54 insertions, 51 deletions

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 1444d358836d..2bcbfb826530 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -49,7 +49,9 @@ extern struct dst_entry *	ip6_route_output(struct sock *sk,
 extern int                      ip6_route_init(void);
 extern void                     ip6_route_cleanup(void);
 
-extern int                      ipv6_route_ioctl(unsigned int cmd, void __user *arg);
+extern int                      ipv6_route_ioctl(struct net *net,
+                                                 unsigned int cmd,
+                                                 void __user *arg);
 
 extern int                      ip6_route_add(struct fib6_config *cfg);
 extern int                      ip6_ins_rt(struct rt6_info *);
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 73021d5baece..60b8a2254046 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -440,6 +440,7 @@ EXPORT_SYMBOL(inet6_getname);
 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
         struct sock *sk = sock->sk;
+        struct net *net = sk->sk_net;
 
         switch(cmd)
         {
@@ -452,7 +453,7 @@ int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
         case SIOCADDRT:
         case SIOCDELRT:
 
-                return(ipv6_route_ioctl(cmd,(void __user *)arg));
+                return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 
         case SIOCSIFADDR:
                 return addrconf_add_ifaddr((void __user *) arg);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index ad3d684e544a..b3ac4901af86 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -609,7 +609,7 @@ static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
 int ip6_ins_rt(struct rt6_info *rt)
 {
         struct nl_info info = {
-                .nl_net = &init_net,
+                .nl_net = rt->rt6i_dev->nd_net,
         };
         return __ip6_ins_rt(rt, &info);
 }
@@ -746,6 +746,7 @@ static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
 void ip6_route_input(struct sk_buff *skb)
 {
         struct ipv6hdr *iph = ipv6_hdr(skb);
+        struct net *net = skb->dev->nd_net;
         int flags = RT6_LOOKUP_F_HAS_SADDR;
         struct flowi fl = {
                 .iif = skb->dev->ifindex,
@@ -763,7 +764,7 @@ void ip6_route_input(struct sk_buff *skb)
         if (rt6_need_strict(&iph->daddr))
                 flags |= RT6_LOOKUP_F_IFACE;
 
-        skb->dst = fib6_rule_lookup(&init_net, &fl, flags, ip6_pol_route_input);
+        skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input);
 }
 
 static struct rt6_info *ip6_pol_route_output(struct fib6_table *table,
@@ -891,12 +892,12 @@ static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
 
 static int ipv6_get_mtu(struct net_device *dev);
 
-static inline unsigned int ipv6_advmss(unsigned int mtu)
+static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu)
 {
         mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
 
-        if (mtu < init_net.ipv6.sysctl.ip6_rt_min_advmss)
-                mtu = init_net.ipv6.sysctl.ip6_rt_min_advmss;
+        if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
+                mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
 
         /*
          * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
@@ -918,6 +919,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 {
         struct rt6_info *rt;
         struct inet6_dev *idev = in6_dev_get(dev);
+        struct net *net = dev->nd_net;
 
         if (unlikely(idev == NULL))
                 return NULL;
@@ -940,7 +942,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
         atomic_set(&rt->u.dst.__refcnt, 1);
         rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
         rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
-        rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
+        rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
         rt->u.dst.output  = ip6_output;
 
 #if 0   /* there's no chance to use these for ndisc */
@@ -956,7 +958,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
         icmp6_dst_gc_list = &rt->u.dst;
         spin_unlock_bh(&icmp6_dst_lock);
 
-        fib6_force_start_gc(dev->nd_net);
+        fib6_force_start_gc(net);
 
 out:
         return &rt->u.dst;
@@ -1049,6 +1051,7 @@ int ipv6_get_hoplimit(struct net_device *dev)
 int ip6_route_add(struct fib6_config *cfg)
 {
         int err;
+        struct net *net = cfg->fc_nlinfo.nl_net;
         struct rt6_info *rt = NULL;
         struct net_device *dev = NULL;
         struct inet6_dev *idev = NULL;
@@ -1063,7 +1066,7 @@ int ip6_route_add(struct fib6_config *cfg)
 #endif
         if (cfg->fc_ifindex) {
                 err = -ENODEV;
-                dev = dev_get_by_index(&init_net, cfg->fc_ifindex);
+                dev = dev_get_by_index(net, cfg->fc_ifindex);
                 if (!dev)
                         goto out;
                 idev = in6_dev_get(dev);
@@ -1074,7 +1077,7 @@ int ip6_route_add(struct fib6_config *cfg)
         if (cfg->fc_metric == 0)
                 cfg->fc_metric = IP6_RT_PRIO_USER;
 
-        table = fib6_new_table(&init_net, cfg->fc_table);
+        table = fib6_new_table(net, cfg->fc_table);
         if (table == NULL) {
                 err = -ENOBUFS;
                 goto out;
@@ -1121,12 +1124,12 @@ int ip6_route_add(struct fib6_config *cfg)
         if ((cfg->fc_flags & RTF_REJECT) ||
             (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
                 /* hold loopback dev/idev if we haven't done so. */
-                if (dev != init_net.loopback_dev) {
+                if (dev != net->loopback_dev) {
                         if (dev) {
                                 dev_put(dev);
                                 in6_dev_put(idev);
                         }
-                        dev = init_net.loopback_dev;
+                        dev = net->loopback_dev;
                         dev_hold(dev);
                         idev = in6_dev_get(dev);
                         if (!idev) {
@@ -1163,7 +1166,7 @@ int ip6_route_add(struct fib6_config *cfg)
                         if (!(gwa_type&IPV6_ADDR_UNICAST))
                                 goto out;
 
-                        grt = rt6_lookup(&init_net, gw_addr, NULL, cfg->fc_ifindex, 1);
+                        grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
 
                         err = -EHOSTUNREACH;
                         if (grt == NULL)
@@ -1230,7 +1233,7 @@ install_route:
         if (!rt->u.dst.metrics[RTAX_MTU-1])
                 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
         if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
-                rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
+                rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
         rt->u.dst.dev = dev;
         rt->rt6i_idev = idev;
         rt->rt6i_table = table;
@@ -1271,7 +1274,7 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
 int ip6_del_rt(struct rt6_info *rt)
 {
         struct nl_info info = {
-                .nl_net = &init_net,
+                .nl_net = rt->rt6i_dev->nd_net,
         };
         return __ip6_del_rt(rt, &info);
 }
@@ -1283,7 +1286,7 @@ static int ip6_route_del(struct fib6_config *cfg)
         struct rt6_info *rt;
         int err = -ESRCH;
 
-        table = fib6_get_table(&init_net, cfg->fc_table);
+        table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
         if (table == NULL)
                 return err;
 
@@ -1382,6 +1385,7 @@ static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
                                            struct net_device *dev)
 {
         int flags = RT6_LOOKUP_F_HAS_SADDR;
+        struct net *net = dev->nd_net;
         struct ip6rd_flowi rdfl = {
                 .fl = {
                         .oif = dev->ifindex,
@@ -1398,8 +1402,7 @@ static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
         if (rt6_need_strict(dest))
                 flags |= RT6_LOOKUP_F_IFACE;
 
-        return (struct rt6_info *)fib6_rule_lookup(&init_net,
-                                                   (struct flowi *)&rdfl,
+        return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl,
                                                    flags, __ip6_route_redirect);
 }
 
@@ -1457,7 +1460,8 @@ void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,
         nrt->rt6i_nexthop = neigh_clone(neigh);
         /* Reset pmtu, it may be better */
         nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
-        nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
+        nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(neigh->dev->nd_net,
+                                                        dst_mtu(&nrt->u.dst));
 
         if (ip6_ins_rt(nrt))
                 goto out;
@@ -1485,9 +1489,10 @@ void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
                         struct net_device *dev, u32 pmtu)
 {
         struct rt6_info *rt, *nrt;
+        struct net *net = dev->nd_net;
         int allfrag = 0;
 
-        rt = rt6_lookup(dev->nd_net, daddr, saddr, dev->ifindex, 0);
+        rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0);
         if (rt == NULL)
                 return;
 
@@ -1520,7 +1525,7 @@ void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
                 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
                 if (allfrag)
                         rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
-                dst_set_expires(&rt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires);
+                dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
                 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
                 goto out;
         }
@@ -1546,7 +1551,7 @@ void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
                  * which is 10 mins. After 10 mins the decreased pmtu is expired
                  * and detecting PMTU increase will be automatically happened.
                  */
-                dst_set_expires(&nrt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires);
+                dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
                 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
 
                 ip6_ins_rt(nrt);
@@ -1659,7 +1664,7 @@ struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *d
         struct rt6_info *rt;
         struct fib6_table *table;
 
-        table = fib6_get_table(&init_net, RT6_TABLE_DFLT);
+        table = fib6_get_table(dev->nd_net, RT6_TABLE_DFLT);
         if (table == NULL)
                 return NULL;
 
@@ -1688,6 +1693,9 @@ struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
                 .fc_ifindex     = dev->ifindex,
                 .fc_flags       = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
                                   RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
+                .fc_nlinfo.pid = 0,
+                .fc_nlinfo.nlh = NULL,
+                .fc_nlinfo.nl_net = dev->nd_net,
         };
 
         ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
@@ -1720,7 +1728,8 @@ restart:
         read_unlock_bh(&table->tb6_lock);
 }
 
-static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg,
+static void rtmsg_to_fib6_config(struct net *net,
+                                 struct in6_rtmsg *rtmsg,
                                  struct fib6_config *cfg)
 {
         memset(cfg, 0, sizeof(*cfg));
@@ -1733,14 +1742,14 @@ static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg,
         cfg->fc_src_len = rtmsg->rtmsg_src_len;
         cfg->fc_flags = rtmsg->rtmsg_flags;
 
-        cfg->fc_nlinfo.nl_net = &init_net;
+        cfg->fc_nlinfo.nl_net = net;
 
         ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
         ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
         ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
 }
 
-int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
+int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 {
         struct fib6_config cfg;
         struct in6_rtmsg rtmsg;
@@ -1756,7 +1765,7 @@ int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
                 if (err)
                         return -EFAULT;
 
-                rtmsg_to_fib6_config(&rtmsg, &cfg);
+                rtmsg_to_fib6_config(net, &rtmsg, &cfg);
 
                 rtnl_lock();
                 switch (cmd) {
@@ -1835,21 +1844,22 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
                                     const struct in6_addr *addr,
                                     int anycast)
 {
+        struct net *net = idev->dev->nd_net;
         struct rt6_info *rt = ip6_dst_alloc();
 
         if (rt == NULL)
                 return ERR_PTR(-ENOMEM);
 
-        dev_hold(init_net.loopback_dev);
+        dev_hold(net->loopback_dev);
         in6_dev_hold(idev);
 
         rt->u.dst.flags = DST_HOST;
         rt->u.dst.input = ip6_input;
         rt->u.dst.output = ip6_output;
-        rt->rt6i_dev = init_net.loopback_dev;
+        rt->rt6i_dev = net->loopback_dev;
         rt->rt6i_idev = idev;
         rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
-        rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
+        rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
         rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
         rt->u.dst.obsolete = -1;
 
@@ -1866,7 +1876,7 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 
         ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
         rt->rt6i_dst.plen = 128;
-        rt->rt6i_table = fib6_get_table(&init_net, RT6_TABLE_LOCAL);
+        rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
 
         atomic_set(&rt->u.dst.__refcnt, 1);
 
@@ -1898,6 +1908,7 @@ static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
 {
         struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
         struct inet6_dev *idev;
+        struct net *net = arg->dev->nd_net;
 
         /* In IPv6 pmtu discovery is not optional,
            so that RTAX_MTU lock cannot disable it.
@@ -1929,7 +1940,7 @@ static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
              (dst_mtu(&rt->u.dst) < arg->mtu &&
               dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
                 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
-                rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
+                rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu);
         }
         return 0;
 }
@@ -2024,13 +2035,9 @@ errout:
 
 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 {
-        struct net *net = skb->sk->sk_net;
         struct fib6_config cfg;
         int err;
 
-        if (net != &init_net)
-                return -EINVAL;
-
         err = rtm_to_fib6_config(skb, nlh, &cfg);
         if (err < 0)
                 return err;
@@ -2040,13 +2047,9 @@ static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *a
 
 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 {
-        struct net *net = skb->sk->sk_net;
         struct fib6_config cfg;
         int err;
 
-        if (net != &init_net)
-                return -EINVAL;
-
         err = rtm_to_fib6_config(skb, nlh, &cfg);
         if (err < 0)
                 return err;
@@ -2190,9 +2193,6 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
         struct flowi fl;
         int err, iif = 0;
 
-        if (net != &init_net)
-                return -EINVAL;
-
         err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
         if (err < 0)
                 goto errout;
@@ -2222,7 +2222,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
 
         if (iif) {
                 struct net_device *dev;
-                dev = __dev_get_by_index(&init_net, iif);
+                dev = __dev_get_by_index(net, iif);
                 if (!dev) {
                         err = -ENODEV;
                         goto errout;
@@ -2252,7 +2252,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
                 goto errout;
         }
 
-        err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
+        err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
 errout:
         return err;
 }
@@ -2260,6 +2260,7 @@ errout:
 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
 {
         struct sk_buff *skb;
+        struct net *net = info->nl_net;
         u32 seq;
         int err;
 
@@ -2278,11 +2279,11 @@ void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
                 kfree_skb(skb);
                 goto errout;
         }
-        err = rtnl_notify(skb, &init_net, info->pid,
-                                RTNLGRP_IPV6_ROUTE, info->nlh, gfp_any());
+        err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
+                          info->nlh, gfp_any());
 errout:
         if (err < 0)
-                rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err);
+                rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
 }
 
 /*
@@ -2544,6 +2545,7 @@ static void ip6_route_net_exit(struct net *net)
         proc_net_remove(net, "ipv6_route");
         proc_net_remove(net, "rt6_stats");
 #endif
+        rt6_ifdown(net, NULL);
 }
 
 static struct pernet_operations ip6_route_net_ops = {
@@ -2592,7 +2594,6 @@ fib6_rules_init:
 xfrm6_init:
         xfrm6_fini();
 out_fib6_init:
-        rt6_ifdown(&init_net, NULL);
         fib6_gc_cleanup();
 out_kmem_cache:
         kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
@@ -2604,7 +2605,6 @@ void ip6_route_cleanup(void)
         unregister_pernet_subsys(&ip6_route_net_ops);
         fib6_rules_cleanup();
         xfrm6_fini();
-        rt6_ifdown(&init_net, NULL);
         fib6_gc_cleanup();
         kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
 }