[NET]: Rethink mark field in struct flowi

tgraf · David S. Miller · commit 47dcf0cb1005 · 2006-12-02T21:21:39.000-08:00
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 &lt;tgraf@suug.ch&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/include/net/flow.h b/include/net/flow.h
@@ -13,41 +13,36 @@
 struct flowi {
 	int	oif;
 	int	iif;
+	__u32	mark;
 
 	union {
 		struct {
 			__be32			daddr;
 			__be32			saddr;
-			__u32			fwmark;
 			__u8			tos;
 			__u8			scope;
 		} ip4_u;
 		
 		struct {
 			struct in6_addr		daddr;
 			struct in6_addr		saddr;
-			__u32			fwmark;
 			__be32			flowlabel;
 		} ip6_u;
 
 		struct {
 			__le16			daddr;
 			__le16			saddr;
-			__u32			fwmark;
 			__u8			scope;
 		} dn_u;
 	} nl_u;
 #define fld_dst		nl_u.dn_u.daddr
 #define fld_src		nl_u.dn_u.saddr
-#define fld_fwmark	nl_u.dn_u.fwmark
 #define fld_scope	nl_u.dn_u.scope
 #define fl6_dst		nl_u.ip6_u.daddr
 #define fl6_src		nl_u.ip6_u.saddr
-#define fl6_fwmark	nl_u.ip6_u.fwmark
 #define fl6_flowlabel	nl_u.ip6_u.flowlabel
 #define fl4_dst		nl_u.ip4_u.daddr
 #define fl4_src		nl_u.ip4_u.saddr
-#define fl4_fwmark	nl_u.ip4_u.fwmark
 #define fl4_tos		nl_u.ip4_u.tos
 #define fl4_scope	nl_u.ip4_u.scope
 
diff --git a/include/net/ip_mp_alg.h b/include/net/ip_mp_alg.h
@@ -88,9 +88,7 @@ static inline int multipath_comparekeys(const struct flowi *flp1,
 	return flp1->fl4_dst == flp2->fl4_dst &&
 		flp1->fl4_src == flp2->fl4_src &&
 		flp1->oif == flp2->oif &&
-#ifdef CONFIG_IP_ROUTE_FWMARK
-		flp1->fl4_fwmark == flp2->fl4_fwmark &&
-#endif
+		flp1->mark == flp2->mark &&
 		!((flp1->fl4_tos ^ flp2->fl4_tos) &
 		  (IPTOS_RT_MASK | RTO_ONLINK));
 }
diff --git a/net/decnet/Kconfig b/net/decnet/Kconfig
@@ -41,11 +41,3 @@ config DECNET_ROUTER
 
 	  See <file:Documentation/networking/decnet.txt> for more information.
 
-config DECNET_ROUTE_FWMARK
-	bool "DECnet: use FWMARK value as routing key (EXPERIMENTAL)"
-	depends on DECNET_ROUTER && NETFILTER
-	help
-	  If you say Y here, you will be able to specify different routes for
-	  packets with different FWMARK ("firewalling mark") values
-	  (see ipchains(8), "-m" argument).
-
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
@@ -269,9 +269,7 @@ static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
 {
 	return ((fl1->nl_u.dn_u.daddr ^ fl2->nl_u.dn_u.daddr) |
 		(fl1->nl_u.dn_u.saddr ^ fl2->nl_u.dn_u.saddr) |
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
-		(fl1->nl_u.dn_u.fwmark ^ fl2->nl_u.dn_u.fwmark) |
-#endif
+		(fl1->mark ^ fl2->mark) |
 		(fl1->nl_u.dn_u.scope ^ fl2->nl_u.dn_u.scope) |
 		(fl1->oif ^ fl2->oif) |
 		(fl1->iif ^ fl2->iif)) == 0;
@@ -882,10 +880,8 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
 				      { .daddr = oldflp->fld_dst,
 					.saddr = oldflp->fld_src,
 					.scope = RT_SCOPE_UNIVERSE,
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
-					.fwmark = oldflp->fld_fwmark
-#endif
 				     } },
+			    .mark = oldflp->mark,
 			    .iif = loopback_dev.ifindex,
 			    .oif = oldflp->oif };
 	struct dn_route *rt = NULL;
@@ -903,7 +899,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
 		       "dn_route_output_slow: dst=%04x src=%04x mark=%d"
 		       " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst),
 		       dn_ntohs(oldflp->fld_src),
-                       oldflp->fld_fwmark, loopback_dev.ifindex, oldflp->oif);
+                       oldflp->mark, loopback_dev.ifindex, oldflp->oif);
 
 	/* If we have an output interface, verify its a DECnet device */
 	if (oldflp->oif) {
@@ -1108,9 +1104,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
 	rt->fl.fld_dst    = oldflp->fld_dst;
 	rt->fl.oif        = oldflp->oif;
 	rt->fl.iif        = 0;
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
-	rt->fl.fld_fwmark = oldflp->fld_fwmark;
-#endif
+	rt->fl.mark       = oldflp->mark;
 
 	rt->rt_saddr      = fl.fld_src;
 	rt->rt_daddr      = fl.fld_dst;
@@ -1178,9 +1172,7 @@ static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *fl
 			rt = rcu_dereference(rt->u.rt_next)) {
 			if ((flp->fld_dst == rt->fl.fld_dst) &&
 			    (flp->fld_src == rt->fl.fld_src) &&
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
-			    (flp->fld_fwmark == rt->fl.fld_fwmark) &&
-#endif
+			    (flp->mark == rt->fl.mark) &&
 			    (rt->fl.iif == 0) &&
 			    (rt->fl.oif == flp->oif)) {
 				rt->u.dst.lastuse = jiffies;
@@ -1235,10 +1227,8 @@ static int dn_route_input_slow(struct sk_buff *skb)
 				     { .daddr = cb->dst,
 				       .saddr = cb->src,
 				       .scope = RT_SCOPE_UNIVERSE,
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
-				       .fwmark = skb->mark
-#endif
 				    } },
+			    .mark = skb->mark,
 			    .iif = skb->dev->ifindex };
 	struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
 	int err = -EINVAL;
@@ -1385,7 +1375,7 @@ static int dn_route_input_slow(struct sk_buff *skb)
 	rt->fl.fld_dst    = cb->dst;
 	rt->fl.oif        = 0;
 	rt->fl.iif        = in_dev->ifindex;
-	rt->fl.fld_fwmark = fl.fld_fwmark;
+	rt->fl.mark       = fl.mark;
 
 	rt->u.dst.flags = DST_HOST;
 	rt->u.dst.neighbour = neigh;
@@ -1457,9 +1447,7 @@ int dn_route_input(struct sk_buff *skb)
 		if ((rt->fl.fld_src == cb->src) &&
 	 	    (rt->fl.fld_dst == cb->dst) &&
 		    (rt->fl.oif == 0) &&
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
-		    (rt->fl.fld_fwmark == skb->mark) &&
-#endif
+		    (rt->fl.mark == skb->mark) &&
 		    (rt->fl.iif == cb->iif)) {
 			rt->u.dst.lastuse = jiffies;
 			dst_hold(&rt->u.dst);
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
@@ -45,10 +45,8 @@ struct dn_fib_rule
 	__le16			dstmask;
 	__le16			srcmap;
 	u8			flags;
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
 	u32			fwmark;
 	u32			fwmask;
-#endif
 };
 
 static struct dn_fib_rule default_rule = {
@@ -131,10 +129,8 @@ static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
 	    ((daddr ^ r->dst) & r->dstmask))
 		return 0;
 
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
-	if ((r->fwmark ^ fl->fld_fwmark) & r->fwmask)
+	if ((r->fwmark ^ fl->mark) & r->fwmask)
 		return 0;
-#endif
 
 	return 1;
 }
@@ -169,7 +165,6 @@ static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
 	if (tb[FRA_DST])
 		r->dst = nla_get_u16(tb[FRA_DST]);
 
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
 	if (tb[FRA_FWMARK]) {
 		r->fwmark = nla_get_u32(tb[FRA_FWMARK]);
 		if (r->fwmark)
@@ -181,7 +176,6 @@ static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
 
 	if (tb[FRA_FWMASK])
 		r->fwmask = nla_get_u32(tb[FRA_FWMASK]);
-#endif
 
 	r->src_len = frh->src_len;
 	r->srcmask = dnet_make_mask(r->src_len);
@@ -203,13 +197,11 @@ static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
 	if (frh->dst_len && (r->dst_len != frh->dst_len))
 		return 0;
 
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
 	if (tb[FRA_FWMARK] && (r->fwmark != nla_get_u32(tb[FRA_FWMARK])))
 		return 0;
 
 	if (tb[FRA_FWMASK] && (r->fwmask != nla_get_u32(tb[FRA_FWMASK])))
 		return 0;
-#endif
 
 	if (tb[FRA_SRC] && (r->src != nla_get_u16(tb[FRA_SRC])))
 		return 0;
@@ -248,12 +240,10 @@ static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
 	frh->src_len = r->src_len;
 	frh->tos = 0;
 
-#ifdef CONFIG_DECNET_ROUTE_FWMARK
 	if (r->fwmark)
 		NLA_PUT_U32(skb, FRA_FWMARK, r->fwmark);
 	if (r->fwmask || r->fwmark)
 		NLA_PUT_U32(skb, FRA_FWMASK, r->fwmask);
-#endif
 	if (r->dst_len)
 		NLA_PUT_U16(skb, FRA_DST, r->dst);
 	if (r->src_len)
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
@@ -104,13 +104,6 @@ config IP_MULTIPLE_TABLES
 
 	  If unsure, say N.
 
-config IP_ROUTE_FWMARK
-	bool "IP: use netfilter MARK value as routing key"
-	depends on IP_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).
-
 config IP_ROUTE_MULTIPATH
 	bool "IP: equal cost multipath"
 	depends on IP_ADVANCED_ROUTER
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
@@ -768,8 +768,8 @@ static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb )
 {
 	
 	struct fib_result       res;
-	struct flowi            fl = { .nl_u = { .ip4_u = { .daddr = frn->fl_addr, 
-							    .fwmark = frn->fl_fwmark,
+	struct flowi            fl = { .mark = frn->fl_fwmark,
+				       .nl_u = { .ip4_u = { .daddr = frn->fl_addr,
 							    .tos = frn->fl_tos,
 							    .scope = frn->fl_scope } } };
 	if (tb) {
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
@@ -44,10 +44,8 @@ struct fib4_rule
 	__be32			srcmask;
 	__be32			dst;
 	__be32			dstmask;
-#ifdef CONFIG_IP_ROUTE_FWMARK
 	u32			fwmark;
 	u32			fwmask;
-#endif
 #ifdef CONFIG_NET_CLS_ROUTE
 	u32			tclassid;
 #endif
@@ -160,10 +158,8 @@ static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
 	if (r->tos && (r->tos != fl->fl4_tos))
 		return 0;
 
-#ifdef CONFIG_IP_ROUTE_FWMARK
-	if ((r->fwmark ^ fl->fl4_fwmark) & r->fwmask)
+	if ((r->fwmark ^ fl->mark) & r->fwmask)
 		return 0;
-#endif
 
 	return 1;
 }
@@ -220,7 +216,6 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
 	if (tb[FRA_DST])
 		rule4->dst = nla_get_be32(tb[FRA_DST]);
 
-#ifdef CONFIG_IP_ROUTE_FWMARK
 	if (tb[FRA_FWMARK]) {
 		rule4->fwmark = nla_get_u32(tb[FRA_FWMARK]);
 		if (rule4->fwmark)
@@ -232,7 +227,6 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
 
 	if (tb[FRA_FWMASK])
 		rule4->fwmask = nla_get_u32(tb[FRA_FWMASK]);
-#endif
 
 #ifdef CONFIG_NET_CLS_ROUTE
 	if (tb[FRA_FLOW])
@@ -264,13 +258,11 @@ static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
 	if (frh->tos && (rule4->tos != frh->tos))
 		return 0;
 
-#ifdef CONFIG_IP_ROUTE_FWMARK
 	if (tb[FRA_FWMARK] && (rule4->fwmark != nla_get_u32(tb[FRA_FWMARK])))
 		return 0;
 
 	if (tb[FRA_FWMASK] && (rule4->fwmask != nla_get_u32(tb[FRA_FWMASK])))
 		return 0;
-#endif
 
 #ifdef CONFIG_NET_CLS_ROUTE
 	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
@@ -296,13 +288,11 @@ static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
 	frh->src_len = rule4->src_len;
 	frh->tos = rule4->tos;
 
-#ifdef CONFIG_IP_ROUTE_FWMARK
 	if (rule4->fwmark)
 		NLA_PUT_U32(skb, FRA_FWMARK, rule4->fwmark);
 
 	if (rule4->fwmask || rule4->fwmark)
 		NLA_PUT_U32(skb, FRA_FWMASK, rule4->fwmask);
-#endif
 
 	if (rule4->dst_len)
 		NLA_PUT_BE32(skb, FRA_DST, rule4->dst);
diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
@@ -27,9 +27,7 @@ int ip_route_me_harder(struct sk_buff **pskb, unsigned addr_type)
 		fl.nl_u.ip4_u.saddr = iph->saddr;
 		fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
 		fl.oif = (*pskb)->sk ? (*pskb)->sk->sk_bound_dev_if : 0;
-#ifdef CONFIG_IP_ROUTE_FWMARK
-		fl.nl_u.ip4_u.fwmark = (*pskb)->mark;
-#endif
+		fl.mark = (*pskb)->mark;
 		if (ip_route_output_key(&rt, &fl) != 0)
 			return -1;
 
diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
@@ -153,9 +153,7 @@ ipt_local_hook(unsigned int hook,
 	if (ret != NF_DROP && ret != NF_STOLEN && ret != NF_QUEUE
 	    && ((*pskb)->nh.iph->saddr != saddr
 		|| (*pskb)->nh.iph->daddr != daddr
-#ifdef CONFIG_IP_ROUTE_FWMARK
 		|| (*pskb)->mark != mark
-#endif
 		|| (*pskb)->nh.iph->tos != tos))
 		if (ip_route_me_harder(pskb, RTN_UNSPEC))
 			ret = NF_DROP;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
