[NET]: Hoplimit is a metric not a route attribute.

include/linux/ipv6_route.h

@@ -13,15 +13,6 @@
 #ifndef _LINUX_IPV6_ROUTE_H
 #define _LINUX_IPV6_ROUTE_H
 
-enum
-{
-	RTA_IPV6_UNSPEC,
-	RTA_IPV6_HOPLIMIT,
-};
-
-#define	RTA_IPV6_MAX RTA_IPV6_HOPLIMIT
-
-
 #define RTF_DEFAULT	0x00010000	/* default - learned via ND	*/
 #define RTF_ALLONLINK	0x00020000	/* fallback, no routers on link	*/
 #define RTF_ADDRCONF	0x00040000	/* addrconf route - RA		*/

include/linux/rtnetlink.h

@@ -201,10 +201,9 @@ enum rtattr_type_t
 	RTA_FLOW,
 	RTA_CACHEINFO,
 	RTA_SESSION,
-	RTA_HOPLIMIT,
 };
 
-#define RTA_MAX RTA_HOPLIMIT
+#define RTA_MAX RTA_SESSION
 
 #define RTM_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg))))
 #define RTM_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtmsg))
@@ -283,9 +282,11 @@ enum
 #define RTAX_ADVMSS RTAX_ADVMSS
 	RTAX_REORDERING,
 #define RTAX_REORDERING RTAX_REORDERING
+	RTAX_HOPLIMIT,
+#define RTAX_HOPLIMIT RTAX_HOPLIMIT
 };
 
-#define RTAX_MAX RTAX_REORDERING
+#define RTAX_MAX RTAX_HOPLIMIT
 
 struct rta_session
 {

include/net/dn_fib.h

@@ -19,7 +19,6 @@ struct dn_kern_rta
         u32             *rta_flow;
         struct rta_cacheinfo *rta_ci;
 	struct rta_session *rta_sess;
-	u8		*rta_hoplimit;
 };
 
 struct dn_fib_res {

include/net/ip6_fib.h

@@ -67,7 +67,6 @@ struct rt6_info
 	
 	u32				rt6i_flags;
 	u32				rt6i_metric;
-	u8				rt6i_hoplimit;
 	atomic_t			rt6i_ref;
 
 	struct rt6key			rt6i_dst;

include/net/ip_fib.h

@@ -38,7 +38,6 @@ struct kern_rta
 	u32		*rta_flow;
 	struct rta_cacheinfo *rta_ci;
 	struct rta_session *rta_sess;
-	u8		*rta_hoplimit;
 };
 
 struct fib_nh

net/ipv6/icmp.c

@@ -362,7 +362,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
 		else
 			hlimit = np->hop_limit;
 		if (hlimit < 0)
-			hlimit = ((struct rt6_info*)dst)->rt6i_hoplimit;
+			hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 	}
 
 	plen = skb->nh.raw - skb->data;
@@ -443,7 +443,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
 		else
 			hlimit = np->hop_limit;
 		if (hlimit < 0)
-			hlimit = ((struct rt6_info*)dst)->rt6i_hoplimit;
+			hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 	}
 
 	idev = in6_dev_get(skb->dev);

net/ipv6/ip6_output.c

@@ -249,7 +249,7 @@ int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
 	if (np)
 		hlimit = np->hop_limit;
 	if (hlimit < 0)
-		hlimit = ((struct rt6_info*)dst)->rt6i_hoplimit;
+		hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 
 	hdr->payload_len = htons(seg_len);
 	hdr->nexthdr = proto;
@@ -609,7 +609,7 @@ int ip6_build_xmit(struct sock *sk, inet_getfrag_t getfrag, const void *data,
 		else
 			hlimit = np->hop_limit;
 		if (hlimit < 0)
-			hlimit = ((struct rt6_info*)dst)->rt6i_hoplimit;
+			hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 	}
 
 	jumbolen = 0;

net/ipv6/ndisc.c

@@ -397,7 +397,7 @@ static inline void ndisc_rt_init(struct rt6_info *rt, struct net_device *dev,
 	rt->rt6i_expires  = 0;
 	rt->rt6i_flags    = RTF_LOCAL;
 	rt->rt6i_metric   = 0;
-	rt->rt6i_hoplimit = 255;
+	rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
 	rt->u.dst.output  = ndisc_output;
 }
 

net/ipv6/raw.c

@@ -677,7 +677,7 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg
 		else
 			hlimit = np->hop_limit;
 		if (hlimit < 0)
-			hlimit = ((struct rt6_info*)dst)->rt6i_hoplimit;
+			hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 	}
 
 	if (msg->msg_flags&MSG_CONFIRM)

net/ipv6/route.c

@@ -108,6 +108,7 @@ struct rt6_info ip6_null_entry = {
 			.dev		= &loopback_dev,
 			.obsolete	= -1,
 			.error		= -ENETUNREACH,
+			.metrics[RTAX_HOPLIMIT-1] = 255,
 			.input		= ip6_pkt_discard,
 			.output		= ip6_pkt_discard,
 			.ops		= &ip6_dst_ops,
@@ -116,7 +117,6 @@ struct rt6_info ip6_null_entry = {
 	},
 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
 	.rt6i_metric	= ~(u32) 0,
-	.rt6i_hoplimit	= 255,
 	.rt6i_ref	= ATOMIC_INIT(1),
 };
 
@@ -769,13 +769,6 @@ int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr)
 		}
 	}
 
-	if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr))
-		rt->rt6i_hoplimit = IPV6_DEFAULT_MCASTHOPS;
-	else if (rta && rta[RTA_HOPLIMIT-1])
-		memcpy(&rt->rt6i_hoplimit, RTA_DATA(rta[RTA_HOPLIMIT-1]), 1);
-	else
-		rt->rt6i_hoplimit = ipv6_get_hoplimit(dev);
-
 	rt->rt6i_flags = rtmsg->rtmsg_flags;
 
 install_route:
@@ -796,6 +789,16 @@ int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr)
 			attr = RTA_NEXT(attr, attrlen);
 		}
 	}
+
+	if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) {
+		if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr))
+			rt->u.dst.metrics[RTAX_HOPLIMIT-1] =
+				IPV6_DEFAULT_MCASTHOPS;
+		else
+			rt->u.dst.metrics[RTAX_HOPLIMIT-1] =
+				ipv6_get_hoplimit(dev);
+	}
+
 	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])
@@ -964,7 +967,6 @@ void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr,
 	nrt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, dst_pmtu(&nrt->u.dst) - 60, ip6_rt_min_advmss);
 	if (nrt->u.dst.metrics[RTAX_ADVMSS-1] > 65535-20)
 		nrt->u.dst.metrics[RTAX_ADVMSS-1] = 65535;
-	nrt->rt6i_hoplimit = ipv6_get_hoplimit(neigh->dev);
 
 	if (rt6_ins(nrt, NULL, NULL))
 		goto out;
@@ -1080,7 +1082,6 @@ static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
 		if (rt->u.dst.dev)
 			dev_hold(rt->u.dst.dev);
 		rt->u.dst.lastuse = jiffies;
-		rt->rt6i_hoplimit = ort->rt6i_hoplimit;
 		rt->rt6i_expires = 0;
 
 		ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
@@ -1226,7 +1227,7 @@ int ip6_rt_addr_add(struct in6_addr *addr, struct net_device *dev)
 	rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, dst_pmtu(&rt->u.dst) - 60, ip6_rt_min_advmss);
 	if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535-20)
 		rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535;
-	rt->rt6i_hoplimit = ipv6_get_hoplimit(rt->rt6i_dev);
+	rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ipv6_get_hoplimit(rt->rt6i_dev);
 	rt->u.dst.obsolete = -1;
 
 	rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;

net/ipv6/udp.c

@@ -968,7 +968,7 @@ static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg
 		else
 			hlimit = np->hop_limit;
 		if (hlimit < 0)
-			hlimit = ((struct rt6_info*)dst)->rt6i_hoplimit;
+			hlimit = dst_metric(dst, RTAX_HOPLIMIT);
 	}
 
 	if (msg->msg_flags&MSG_CONFIRM)

net/ipv6/xfrm6_policy.c

@@ -153,7 +153,6 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
 		x->u.rt6.rt6i_flags    = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
 		x->u.rt6.rt6i_metric   = rt0->rt6i_metric;
 		x->u.rt6.rt6i_node     = rt0->rt6i_node;
-		x->u.rt6.rt6i_hoplimit = rt0->rt6i_hoplimit;
 		x->u.rt6.rt6i_gateway  = rt0->rt6i_gateway;
 		memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway)); 
 		header_len -= x->u.dst.xfrm->props.header_len;