[NET]: Rethink mark field in struct flowi

Now that all protocols have been made aware of the mark
field it can be moved out of the union thus simplyfing
its usage.

The config options in the IPv4/IPv6/DECnet subsystems
to enable respectively disable mark based routing only
obfuscate the code with ifdefs, the cost for the
additional comparison in the flow key is insignificant,
and most distributions have all these options enabled
by default anyway. Therefore it makes sense to remove
the config options and enable mark based routing by
default.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 2 insertions, 21 deletions

diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 6e48f52e197c..deb4101a2a81 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -196,10 +196,3 @@ config IPV6_SUBTREES
 
           If unsure, say N.
 
-config IPV6_ROUTE_FWMARK
-        bool "IPv6: use netfilter MARK value as routing key"
-        depends on IPV6_MULTIPLE_TABLES && NETFILTER
-        ---help---
-          If you say Y here, you will be able to specify different routes for
-          packets with different mark values (see iptables(8), MARK target).
-
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index 1896ecb52899..89bea64eee1c 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -25,10 +25,8 @@ struct fib6_rule
         struct fib_rule         common;
         struct rt6key           src;
         struct rt6key           dst;
-#ifdef CONFIG_IPV6_ROUTE_FWMARK
         u32                     fwmark;
         u32                     fwmask;
-#endif
         u8                      tclass;
 };
 
@@ -130,10 +128,8 @@ static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
         if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
                 return 0;
 
-#ifdef CONFIG_IPV6_ROUTE_FWMARK
-        if ((r->fwmark ^ fl->fl6_fwmark) & r->fwmask)
+        if ((r->fwmark ^ fl->mark) & r->fwmask)
                 return 0;
-#endif
 
         return 1;
 }
@@ -177,7 +173,6 @@ static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
                 nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
                            sizeof(struct in6_addr));
 
-#ifdef CONFIG_IPV6_ROUTE_FWMARK
         if (tb[FRA_FWMARK]) {
                 rule6->fwmark = nla_get_u32(tb[FRA_FWMARK]);
                 if (rule6->fwmark) {
@@ -192,7 +187,6 @@ static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
 
         if (tb[FRA_FWMASK])
                 rule6->fwmask = nla_get_u32(tb[FRA_FWMASK]);
-#endif
 
         rule6->src.plen = frh->src_len;
         rule6->dst.plen = frh->dst_len;
@@ -225,13 +219,11 @@ static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
             nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
                 return 0;
 
-#ifdef CONFIG_IPV6_ROUTE_FWMARK
         if (tb[FRA_FWMARK] && (rule6->fwmark != nla_get_u32(tb[FRA_FWMARK])))
                 return 0;
 
         if (tb[FRA_FWMASK] && (rule6->fwmask != nla_get_u32(tb[FRA_FWMASK])))
                 return 0;
-#endif
 
         return 1;
 }
@@ -254,13 +246,11 @@ static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
                 NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
                         &rule6->src.addr);
 
-#ifdef CONFIG_IPV6_ROUTE_FWMARK
         if (rule6->fwmark)
                 NLA_PUT_U32(skb, FRA_FWMARK, rule6->fwmark);
 
         if (rule6->fwmask || rule6->fwmark)
                 NLA_PUT_U32(skb, FRA_FWMASK, rule6->fwmask);
-#endif
 
         return 0;
 
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index aaabb1fad1cf..e3eab1529633 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -711,12 +711,10 @@ void ip6_route_input(struct sk_buff *skb)
                         .ip6_u = {
                                 .daddr = iph->daddr,
                                 .saddr = iph->saddr,
-#ifdef CONFIG_IPV6_ROUTE_FWMARK
-                                .fwmark = skb->mark,
-#endif
                                 .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
                         },
                 },
+                .mark = skb->mark,
                 .proto = iph->nexthdr,
         };