Re: [PATCH] Prefix List against 2.5.70 (re-done)

[Krishna Kumar <krkumar@us.ibm.com>]

Hi Dave,

 > I don't think it's wise to make RTNETLINK facilities dependant upon ifdef

Following is the patch without the PREFIXLIST config option. I have remade it
against 2.5.73.

We would like to have this functionality in 2.4 kernel, so can I go ahead and
send this patch against 2.4.21 too ?

Thanks,

- KK

--------------------------------------------------------------------------------
diff -ruN linux-2.5.73.org/include/linux/ipv6_route.h 
linux-2.5.73.new/include/linux/ipv6_route.h
--- linux-2.5.73.org/include/linux/ipv6_route.h	2003-06-22 11:32:36.000000000 -0700
+++ linux-2.5.73.new/include/linux/ipv6_route.h	2003-06-26 09:05:01.000000000 -0700
@@ -44,4 +44,16 @@
  #define RTMSG_NEWROUTE		0x21
  #define RTMSG_DELROUTE		0x22

+/*
+ * Return entire prefix list in array of following structures. Provides the
+ * prefix and prefix length for all devices.
+ */
+
+struct in6_prefix_msg
+{
+	int ifindex;
+	int prefix_len;
+	struct in6_addr prefix;
+};
+
  #endif
diff -ruN linux-2.5.73.org/include/linux/rtnetlink.h 
linux-2.5.73.new/include/linux/rtnetlink.h
--- linux-2.5.73.org/include/linux/rtnetlink.h	2003-06-22 11:33:07.000000000 -0700
+++ linux-2.5.73.new/include/linux/rtnetlink.h	2003-06-26 09:05:01.000000000 -0700
@@ -47,7 +47,11 @@
  #define	RTM_DELTFILTER	(RTM_BASE+29)
  #define	RTM_GETTFILTER	(RTM_BASE+30)

-#define	RTM_MAX		(RTM_BASE+31)
+#define	RTM_GETLNKFLAGS	(RTM_BASE+34)
+
+#define	RTM_GETPLIST	(RTM_BASE+38)
+
+#define	RTM_MAX		(RTM_GETPLIST+1)

  /*
     Generic structure for encapsulation of optional route information.
@@ -61,6 +65,14 @@
  	unsigned short	rta_type;
  };

+/* Structure to return per interface device flags */
+
+struct ifp_if6info
+{
+	int ifindex;
+	int flags;
+};
+
  /* Macros to handle rtattributes */

  #define RTA_ALIGNTO	4
@@ -201,9 +213,11 @@
  	RTA_FLOW,
  	RTA_CACHEINFO,
  	RTA_SESSION,
+	RTA_LINKFLAGS,
+	RTA_RA6INFO,	/* No support yet, send event on new prefix event */
  };

-#define RTA_MAX RTA_SESSION
+#define RTA_MAX RTA_RA6INFO

  #define RTM_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct 
rtmsg))))
  #define RTM_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtmsg))
diff -ruN linux-2.5.73.org/include/net/if_inet6.h 
linux-2.5.73.new/include/net/if_inet6.h
--- linux-2.5.73.org/include/net/if_inet6.h	2003-06-22 11:33:32.000000000 -0700
+++ linux-2.5.73.new/include/net/if_inet6.h	2003-06-26 09:05:01.000000000 -0700
@@ -17,6 +17,8 @@

  #include <net/snmp.h>

+#define IF_RA_OTHERCONF	0x80
+#define IF_RA_MANAGED	0x40
  #define IF_RA_RCVD	0x20
  #define IF_RS_SENT	0x10

diff -ruN linux-2.5.73.org/include/net/ip6_route.h 
linux-2.5.73.new/include/net/ip6_route.h
--- linux-2.5.73.org/include/net/ip6_route.h	2003-06-22 11:32:37.000000000 -0700
+++ linux-2.5.73.new/include/net/ip6_route.h	2003-06-26 09:05:01.000000000 -0700
@@ -87,6 +87,7 @@
  struct nlmsghdr;
  struct netlink_callback;
  extern int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb);
+extern int inet6_dump_prefix(struct sk_buff *skb, struct netlink_callback *cb);
  extern int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void 
*arg);
  extern int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void 
*arg);
  extern int inet6_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void 
*arg);
diff -ruN linux-2.5.73.org/net/ipv6/addrconf.c linux-2.5.73.new/net/ipv6/addrconf.c
--- linux-2.5.73.org/net/ipv6/addrconf.c	2003-06-22 11:33:17.000000000 -0700
+++ linux-2.5.73.new/net/ipv6/addrconf.c	2003-06-26 09:05:01.000000000 -0700
@@ -129,7 +129,7 @@

  static int addrconf_ifdown(struct net_device *dev, int how);

-static void addrconf_dad_start(struct inet6_ifaddr *ifp);
+static void addrconf_dad_start(struct inet6_ifaddr *ifp, int flags);
  static void addrconf_dad_timer(unsigned long data);
  static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
  static void addrconf_rs_timer(unsigned long data);
@@ -715,7 +715,7 @@
  	ift->prefered_lft = tmp_prefered_lft;
  	ift->tstamp = ifp->tstamp;
  	spin_unlock_bh(&ift->lock);
-	addrconf_dad_start(ift);
+	addrconf_dad_start(ift, 0);
  	in6_ifa_put(ift);
  	in6_dev_put(idev);
  out:
@@ -1211,7 +1211,7 @@
  	rtmsg.rtmsg_dst_len = 8;
  	rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
  	rtmsg.rtmsg_ifindex = dev->ifindex;
-	rtmsg.rtmsg_flags = RTF_UP|RTF_ADDRCONF;
+	rtmsg.rtmsg_flags = RTF_UP;
  	rtmsg.rtmsg_type = RTMSG_NEWROUTE;
  	ip6_route_add(&rtmsg, NULL, NULL);
  }
@@ -1238,7 +1238,7 @@
  	struct in6_addr addr;

  	ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
-	addrconf_prefix_route(&addr, 64, dev, 0, RTF_ADDRCONF);
+	addrconf_prefix_route(&addr, 64, dev, 0, 0);
  }

  static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
@@ -1378,7 +1378,7 @@
  			}

  			create = 1;
-			addrconf_dad_start(ifp);
+			addrconf_dad_start(ifp, RTF_ADDRCONF);
  		}

  		if (ifp && valid_lft == 0) {
@@ -1529,7 +1529,7 @@

  	ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
  	if (!IS_ERR(ifp)) {
-		addrconf_dad_start(ifp);
+		addrconf_dad_start(ifp, 0);
  		in6_ifa_put(ifp);
  		return 0;
  	}
@@ -1704,7 +1704,7 @@

  	ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
  	if (!IS_ERR(ifp)) {
-		addrconf_dad_start(ifp);
+		addrconf_dad_start(ifp, 0);
  		in6_ifa_put(ifp);
  	}
  }
@@ -1943,8 +1943,7 @@
  		memset(&rtmsg, 0, sizeof(struct in6_rtmsg));
  		rtmsg.rtmsg_type = RTMSG_NEWROUTE;
  		rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
-		rtmsg.rtmsg_flags = (RTF_ALLONLINK | RTF_ADDRCONF |
-				     RTF_DEFAULT | RTF_UP);
+		rtmsg.rtmsg_flags = (RTF_ALLONLINK | RTF_DEFAULT | RTF_UP);

  		rtmsg.rtmsg_ifindex = ifp->idev->dev->ifindex;

@@ -1958,7 +1957,7 @@
  /*
   *	Duplicate Address Detection
   */
-static void addrconf_dad_start(struct inet6_ifaddr *ifp)
+static void addrconf_dad_start(struct inet6_ifaddr *ifp, int flags)
  {
  	struct net_device *dev;
  	unsigned long rand_num;
@@ -1968,7 +1967,7 @@
  	addrconf_join_solict(dev, &ifp->addr);

  	if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
-		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, RTF_ADDRCONF);
+		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, flags);

  	net_srandom(ifp->addr.s6_addr32[3]);
  	rand_num = net_random() % (ifp->idev->cnf.rtr_solicit_delay ? : 1);
@@ -2451,6 +2450,42 @@
  	netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFADDR, GFP_ATOMIC);
  }

+int inet6_dump_linkflags(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	int ifindex, flags = 0;
+	struct net_device *dev;
+	struct inet6_dev *idev;
+	struct nlmsghdr *nlh;
+	struct ifp_if6info *ifp = NLMSG_DATA(cb->nlh);
+	unsigned char *org_tail = skb->tail;
+
+	ifindex = ifp->ifindex;
+
+	if ((dev = dev_get_by_index(ifindex)) == NULL)
+		goto out;
+	if ((idev = in6_dev_get(dev)) != NULL) {
+		flags = idev->if_flags;
+		in6_dev_put(idev);
+	}
+	dev_put(dev);
+
+	nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
+			RTA_LINKFLAGS, sizeof(*ifp));
+	ifp = NLMSG_DATA(nlh);
+	ifp->flags = flags;
+	ifp->ifindex = ifindex;	/* duplicate information for user to verify */
+
+	nlh->nlmsg_len = skb->tail - org_tail;
+	return skb->len;
+
+nlmsg_failure:
+	printk(KERN_INFO "inet6_dump_linkflags:skb size not enough\n");
+	skb_trim(skb, org_tail - skb->data);
+
+out:
+	return -1;
+}
+
  static struct rtnetlink_link inet6_rtnetlink_table[RTM_MAX - RTM_BASE + 1] = {
  	[RTM_NEWADDR - RTM_BASE] = { .doit	= inet6_rtm_newaddr, },
  	[RTM_DELADDR - RTM_BASE] = { .doit	= inet6_rtm_deladdr, },
@@ -2459,6 +2494,8 @@
  	[RTM_DELROUTE - RTM_BASE] = { .doit	= inet6_rtm_delroute, },
  	[RTM_GETROUTE - RTM_BASE] = { .doit	= inet6_rtm_getroute,
  				      .dumpit	= inet6_dump_fib, },
+	[RTM_GETLNKFLAGS - RTM_BASE] = { .dumpit = inet6_dump_linkflags, },
+	[RTM_GETPLIST - RTM_BASE] = { .dumpit	= inet6_dump_prefix, },
  };

  static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
diff -ruN linux-2.5.73.org/net/ipv6/ndisc.c linux-2.5.73.new/net/ipv6/ndisc.c
--- linux-2.5.73.org/net/ipv6/ndisc.c	2003-06-22 11:32:56.000000000 -0700
+++ linux-2.5.73.new/net/ipv6/ndisc.c	2003-06-26 09:05:01.000000000 -0700
@@ -1036,6 +1036,16 @@
  		 */
  		in6_dev->if_flags |= IF_RA_RCVD;
  	}
+	/*
+	 * Remember the managed/otherconf flags from most recently
+	 * receieved RA message (RFC 2462) -- yoshfuji
+	 */
+	in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED|
+				IF_RA_OTHERCONF)) |
+				(ra_msg->icmph.icmp6_addrconf_managed ?
+					IF_RA_MANAGED : 0) |
+				(ra_msg->icmph.icmp6_addrconf_other ?
+					IF_RA_OTHERCONF : 0);

  	lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);

diff -ruN linux-2.5.73.org/net/ipv6/route.c linux-2.5.73.new/net/ipv6/route.c
--- linux-2.5.73.org/net/ipv6/route.c	2003-06-22 11:33:05.000000000 -0700
+++ linux-2.5.73.new/net/ipv6/route.c	2003-06-26 09:05:01.000000000 -0700
@@ -1511,6 +1511,66 @@
  	return 0;
  }

+static int rt6_fill_prefix(struct sk_buff *skb, struct rt6_info *rt,
+			 int type, u32 pid, u32 seq)
+{
+	struct in6_prefix_msg *pmsg;
+	struct nlmsghdr  *nlh;
+	unsigned char *b = skb->tail;
+
+	nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*pmsg));
+	pmsg = NLMSG_DATA(nlh);
+	pmsg->ifindex = rt->rt6i_dev->ifindex;
+	pmsg->prefix_len = rt->rt6i_dst.plen;
+	ipv6_addr_copy(&pmsg->prefix, &rt->rt6i_dst.addr);
+	nlh->nlmsg_len = skb->tail - b;
+	return skb->len;
+
+nlmsg_failure:
+	printk(KERN_INFO "rt6_fill_prefix:skb size not enough\n");
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static int rt6_dump_route_prefix(struct rt6_info *rt, void *p_arg)
+{
+	int addr_type;
+	struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
+
+	/*
+	 * Definition of a prefix :
+	 * 	- Should be autoconfigured
+	 *	- No nexthop
+	 *	- Not a linklocal, loopback or multicast type.
+	 */
+	if (rt->rt6i_nexthop || (rt->rt6i_flags & RTF_ADDRCONF) == 0)
+		return 0;
+	addr_type = ipv6_addr_type(&rt->rt6i_dst.addr);
+	if ((addr_type & (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK |
+			IPV6_ADDR_MULTICAST)) != 0 ||
+			addr_type == IPV6_ADDR_ANY)
+		return 0;
+	return rt6_fill_prefix(arg->skb, rt, RTM_GETPLIST,
+		     NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq);
+}
+
+static int fib6_dump_prefix(struct fib6_walker_t *w)
+{
+	int res;
+	struct rt6_info *rt;
+
+	for (rt = w->leaf; rt; rt = rt->u.next) {
+		res = rt6_dump_route_prefix(rt, w->args);
+		if (res < 0) {
+			/* Frame is full, suspend walking */
+			w->leaf = rt;
+			return 1;
+		}
+	}
+	w->leaf = NULL;
+	return 0;
+}
+
  static void fib6_dump_end(struct netlink_callback *cb)
  {
  	struct fib6_walker_t *w = (void*)cb->args[0];
@@ -1532,7 +1592,8 @@
  	return cb->done(cb);
  }

-int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
+static int __inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb,
+			int prefix)
  {
  	struct rt6_rtnl_dump_arg arg;
  	struct fib6_walker_t *w;
@@ -1559,7 +1620,10 @@
  		RT6_TRACE("dump<%p", w);
  		memset(w, 0, sizeof(*w));
  		w->root = &ip6_routing_table;
-		w->func = fib6_dump_node;
+		if (prefix)
+			w->func = fib6_dump_prefix;
+		else
+			w->func = fib6_dump_node;
  		w->args = &arg;
  		cb->args[0] = (long)w;
  		read_lock_bh(&rt6_lock);
@@ -1586,6 +1650,16 @@
  	return res;
  }

+int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	return __inet6_dump_fib(skb, cb, 0);
+}
+
+int inet6_dump_prefix(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	return __inet6_dump_fib(skb, cb, 1);
+}
+
  int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
  {
  	struct rtattr **rta = arg;