[NET]: Introduce RTA_TABLE/FRA_TABLE attributes

Introduce RTA_TABLE route attribute and FRA_TABLE routing rule attribute
to hold 32 bit routing table IDs. Usespace compatibility is provided by
continuing to accept and send the rtm_table field, but because of its
limited size it can only carry the low 8 bits of the table ID. This
implies that if larger IDs are used, _all_ userspace programs using them
need to use RTA_TABLE.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

13 files changed, 45 insertions, 12 deletions

diff --git a/include/linux/fib_rules.h b/include/linux/fib_rules.h
index 5e503f0ca6e4..19a82b6c1c1f 100644
--- a/include/linux/fib_rules.h
+++ b/include/linux/fib_rules.h
@@ -36,6 +36,10 @@ enum
         FRA_UNUSED5,
         FRA_FWMARK,     /* netfilter mark (IPv4) */
         FRA_FLOW,       /* flow/class id */
+        FRA_UNUSED6,
+        FRA_UNUSED7,
+        FRA_UNUSED8,
+        FRA_TABLE,      /* Extended table id */
         __FRA_MAX
 };
 
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 0aaffa2ae666..ea422a539a03 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -264,6 +264,7 @@ enum rtattr_type_t
         RTA_CACHEINFO,
         RTA_SESSION,
         RTA_MP_ALGO,
+        RTA_TABLE,
         __RTA_MAX
 };
 
@@ -717,6 +718,13 @@ extern void __rtnl_unlock(void);
         } \
 } while(0)
 
+static inline u32 rtm_get_table(struct rtattr **rta, u8 table)
+{
+        return RTA_GET_U32(rta[RTA_TABLE-1]);
+rtattr_failure:
+        return table;
+}
+
 #endif /* __KERNEL__ */
 
 
diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
index 61375d9e53f8..8e2f473d3e82 100644
--- a/include/net/fib_rules.h
+++ b/include/net/fib_rules.h
@@ -74,6 +74,13 @@ static inline void fib_rule_put(struct fib_rule *rule)
                 call_rcu(&rule->rcu, fib_rule_put_rcu);
 }
 
+static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
+{
+        if (nla[FRA_TABLE])
+                return nla_get_u32(nla[FRA_TABLE]);
+        return frh->table;
+}
+
 extern int                      fib_rules_register(struct fib_rules_ops *);
 extern int                      fib_rules_unregister(struct fib_rules_ops *);
 
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 6cdad24038e2..873b04d5df81 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -187,7 +187,7 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 
         rule->action = frh->action;
         rule->flags = frh->flags;
-        rule->table = frh->table;
+        rule->table = frh_get_table(frh, tb);
 
         if (!rule->pref && ops->default_pref)
                 rule->pref = ops->default_pref();
@@ -245,7 +245,7 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
                 if (frh->action && (frh->action != rule->action))
                         continue;
 
-                if (frh->table && (frh->table != rule->table))
+                if (frh->table && (frh_get_table(frh, tb) != rule->table))
                         continue;
 
                 if (tb[FRA_PRIORITY] &&
@@ -291,6 +291,7 @@ static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
 
         frh = nlmsg_data(nlh);
         frh->table = rule->table;
+        NLA_PUT_U32(skb, FRA_TABLE, rule->table);
         frh->res1 = 0;
         frh->res2 = 0;
         frh->action = rule->action;
diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c
index 7b3bf5c3d720..fb596373daa8 100644
--- a/net/decnet/dn_fib.c
+++ b/net/decnet/dn_fib.c
@@ -491,7 +491,8 @@ static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
                 if (attr) {
                         if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
                                 return -EINVAL;
-                        if (i != RTA_MULTIPATH && i != RTA_METRICS)
+                        if (i != RTA_MULTIPATH && i != RTA_METRICS &&
+                            i != RTA_TABLE)
                                 rta[i-1] = (struct rtattr *)RTA_DATA(attr);
                 }
         }
@@ -508,7 +509,7 @@ int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
         if (dn_fib_check_attr(r, rta))
                 return -EINVAL;
 
-        tb = dn_fib_get_table(r->rtm_table, 0);
+        tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
         if (tb)
                 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 
@@ -524,7 +525,7 @@ int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
         if (dn_fib_check_attr(r, rta))
                 return -EINVAL;
 
-        tb = dn_fib_get_table(r->rtm_table, 1);
+        tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
         if (tb) 
                 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
 
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 5e6f4616ca10..4c963213fba5 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -1486,6 +1486,7 @@ static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
         r->rtm_src_len = 0;
         r->rtm_tos = 0;
         r->rtm_table = RT_TABLE_MAIN;
+        RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN);
         r->rtm_type = rt->rt_type;
         r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
         r->rtm_scope = RT_SCOPE_UNIVERSE;
diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c
index 1601ee5406a8..eca7c1e10c80 100644
--- a/net/decnet/dn_table.c
+++ b/net/decnet/dn_table.c
@@ -278,6 +278,7 @@ static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
         rtm->rtm_src_len = 0;
         rtm->rtm_tos = 0;
         rtm->rtm_table = tb_id;
+        RTA_PUT_U32(skb, RTA_TABLE, tb_id);
         rtm->rtm_flags = fi->fib_flags;
         rtm->rtm_scope = scope;
         rtm->rtm_type  = type;
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 06f4b23f6f57..2696ede52de2 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -294,7 +294,8 @@ static int inet_check_attr(struct rtmsg *r, struct rtattr **rta)
                 if (attr) {
                         if (RTA_PAYLOAD(attr) < 4)
                                 return -EINVAL;
-                        if (i != RTA_MULTIPATH && i != RTA_METRICS)
+                        if (i != RTA_MULTIPATH && i != RTA_METRICS &&
+                            i != RTA_TABLE)
                                 *rta = (struct rtattr*)RTA_DATA(attr);
                 }
         }
@@ -310,7 +311,7 @@ int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
         if (inet_check_attr(r, rta))
                 return -EINVAL;
 
-        tb = fib_get_table(r->rtm_table);
+        tb = fib_get_table(rtm_get_table(rta, r->rtm_table));
         if (tb)
                 return tb->tb_delete(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb));
         return -ESRCH;
@@ -325,7 +326,7 @@ int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
         if (inet_check_attr(r, rta))
                 return -EINVAL;
 
-        tb = fib_new_table(r->rtm_table);
+        tb = fib_new_table(rtm_get_table(rta, r->rtm_table));
         if (tb)
                 return tb->tb_insert(tb, r, (struct kern_rta*)rta, nlh, &NETLINK_CB(skb));
         return -ENOBUFS;
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 58fb91b00fdf..0330b9cc4b58 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -184,6 +184,7 @@ static struct nla_policy fib4_rule_policy[FRA_MAX+1] __read_mostly = {
         [FRA_DST]       = { .type = NLA_U32 },
         [FRA_FWMARK]    = { .type = NLA_U32 },
         [FRA_FLOW]      = { .type = NLA_U32 },
+        [FRA_TABLE]     = { .type = NLA_U32 },
 };
 
 static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index c7a112b5a185..ab753df20a39 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -953,6 +953,7 @@ fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
         rtm->rtm_src_len = 0;
         rtm->rtm_tos = tos;
         rtm->rtm_table = tb_id;
+        RTA_PUT_U32(skb, RTA_TABLE, tb_id);
         rtm->rtm_type = type;
         rtm->rtm_flags = fi->fib_flags;
         rtm->rtm_scope = scope;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index b873cbcdd0b8..12128b82c9dc 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2652,6 +2652,7 @@ static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
         r->rtm_src_len  = 0;
         r->rtm_tos      = rt->fl.fl4_tos;
         r->rtm_table    = RT_TABLE_MAIN;
+        RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN);
         r->rtm_type     = rt->rt_type;
         r->rtm_scope    = RT_SCOPE_UNIVERSE;
         r->rtm_protocol = RTPROT_UNSPEC;
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index 22a2fdb09831..2c4fbc855e6c 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -129,6 +129,7 @@ static struct nla_policy fib6_rule_policy[RTA_MAX+1] __read_mostly = {
         [FRA_PRIORITY]  = { .type = NLA_U32 },
         [FRA_SRC]       = { .minlen = sizeof(struct in6_addr) },
         [FRA_DST]       = { .minlen = sizeof(struct in6_addr) },
+        [FRA_TABLE]     = { .type = NLA_U32 },
 };
 
 static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e08d84063c1f..843c5509fced 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1859,7 +1859,8 @@ int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 
         if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
                 return -EINVAL;
-        return ip6_route_del(&rtmsg, nlh, arg, &NETLINK_CB(skb), r->rtm_table);
+        return ip6_route_del(&rtmsg, nlh, arg, &NETLINK_CB(skb),
+                             rtm_get_table(arg, r->rtm_table));
 }
 
 int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
@@ -1869,7 +1870,8 @@ int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 
         if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
                 return -EINVAL;
-        return ip6_route_add(&rtmsg, nlh, arg, &NETLINK_CB(skb), r->rtm_table);
+        return ip6_route_add(&rtmsg, nlh, arg, &NETLINK_CB(skb),
+                             rtm_get_table(arg, r->rtm_table));
 }
 
 struct rt6_rtnl_dump_arg
@@ -1887,6 +1889,7 @@ static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
         struct nlmsghdr  *nlh;
         unsigned char    *b = skb->tail;
         struct rta_cacheinfo ci;
+        u32 table;
 
         if (prefix) {   /* user wants prefix routes only */
                 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
@@ -1902,9 +1905,11 @@ static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
         rtm->rtm_src_len = rt->rt6i_src.plen;
         rtm->rtm_tos = 0;
         if (rt->rt6i_table)
-                rtm->rtm_table = rt->rt6i_table->tb6_id;
+                table = rt->rt6i_table->tb6_id;
         else
-                rtm->rtm_table = RT6_TABLE_UNSPEC;
+                table = RT6_TABLE_UNSPEC;
+        rtm->rtm_table = table;
+        RTA_PUT_U32(skb, RTA_TABLE, table);
         if (rt->rt6i_flags&RTF_REJECT)
                 rtm->rtm_type = RTN_UNREACHABLE;
         else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))