[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>

1 files changed, 9 insertions, 27 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 4de3e38fa1a8..d7152b2b2c64 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -568,9 +568,7 @@ static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
 {
         return ((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) |
                 (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr) |
-#ifdef CONFIG_IP_ROUTE_FWMARK
-                (fl1->nl_u.ip4_u.fwmark ^ fl2->nl_u.ip4_u.fwmark) |
-#endif
+                (fl1->mark ^ fl2->mark) |
                 (*(u16 *)&fl1->nl_u.ip4_u.tos ^
                  *(u16 *)&fl2->nl_u.ip4_u.tos) |
                 (fl1->oif ^ fl2->oif) |
@@ -1643,9 +1641,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
         rth->fl.fl4_dst = daddr;
         rth->rt_dst     = daddr;
         rth->fl.fl4_tos = tos;
-#ifdef CONFIG_IP_ROUTE_FWMARK
-        rth->fl.fl4_fwmark= skb->mark;
-#endif
+        rth->fl.mark    = skb->mark;
         rth->fl.fl4_src = saddr;
         rth->rt_src     = saddr;
 #ifdef CONFIG_NET_CLS_ROUTE
@@ -1789,9 +1785,7 @@ static inline int __mkroute_input(struct sk_buff *skb,
         rth->fl.fl4_dst = daddr;
         rth->rt_dst     = daddr;
         rth->fl.fl4_tos = tos;
-#ifdef CONFIG_IP_ROUTE_FWMARK
-        rth->fl.fl4_fwmark= skb->mark;
-#endif
+        rth->fl.mark    = skb->mark;
         rth->fl.fl4_src = saddr;
         rth->rt_src     = saddr;
         rth->rt_gateway = daddr;
@@ -1920,10 +1914,8 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
                                         .saddr = saddr,
                                         .tos = tos,
                                         .scope = RT_SCOPE_UNIVERSE,
-#ifdef CONFIG_IP_ROUTE_FWMARK
-                                        .fwmark = skb->mark
-#endif
                                       } },
+                            .mark = skb->mark,
                             .iif = dev->ifindex };
         unsigned        flags = 0;
         u32             itag = 0;
@@ -2034,9 +2026,7 @@ local_input:
         rth->fl.fl4_dst = daddr;
         rth->rt_dst     = daddr;
         rth->fl.fl4_tos = tos;
-#ifdef CONFIG_IP_ROUTE_FWMARK
-        rth->fl.fl4_fwmark= skb->mark;
-#endif
+        rth->fl.mark    = skb->mark;
         rth->fl.fl4_src = saddr;
         rth->rt_src     = saddr;
 #ifdef CONFIG_NET_CLS_ROUTE
@@ -2113,9 +2103,7 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
                     rth->fl.fl4_src == saddr &&
                     rth->fl.iif == iif &&
                     rth->fl.oif == 0 &&
-#ifdef CONFIG_IP_ROUTE_FWMARK
-                    rth->fl.fl4_fwmark == skb->mark &&
-#endif
+                    rth->fl.mark == skb->mark &&
                     rth->fl.fl4_tos == tos) {
                         rth->u.dst.lastuse = jiffies;
                         dst_hold(&rth->u.dst);
@@ -2239,9 +2227,7 @@ static inline int __mkroute_output(struct rtable **result,
         rth->fl.fl4_tos = tos;
         rth->fl.fl4_src = oldflp->fl4_src;
         rth->fl.oif     = oldflp->oif;
-#ifdef CONFIG_IP_ROUTE_FWMARK
-        rth->fl.fl4_fwmark= oldflp->fl4_fwmark;
-#endif
+        rth->fl.mark    = oldflp->mark;
         rth->rt_dst     = fl->fl4_dst;
         rth->rt_src     = fl->fl4_src;
         rth->rt_iif     = oldflp->oif ? : dev_out->ifindex;
@@ -2385,10 +2371,8 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
                                         .scope = ((tos & RTO_ONLINK) ?
                                                   RT_SCOPE_LINK :
                                                   RT_SCOPE_UNIVERSE),
-#ifdef CONFIG_IP_ROUTE_FWMARK
-                                        .fwmark = oldflp->fl4_fwmark
-#endif
                                       } },
+                            .mark = oldflp->mark,
                             .iif = loopback_dev.ifindex,
                             .oif = oldflp->oif };
         struct fib_result res;
@@ -2583,9 +2567,7 @@ int __ip_route_output_key(struct rtable **rp, const struct flowi *flp)
                     rth->fl.fl4_src == flp->fl4_src &&
                     rth->fl.iif == 0 &&
                     rth->fl.oif == flp->oif &&
-#ifdef CONFIG_IP_ROUTE_FWMARK
-                    rth->fl.fl4_fwmark == flp->fl4_fwmark &&
-#endif
+                    rth->fl.mark == flp->mark &&
                     !((rth->fl.fl4_tos ^ flp->fl4_tos) &
                             (IPTOS_RT_MASK | RTO_ONLINK))) {