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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/net/ipv6/ndisc.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *	Neighbour Discovery for IPv6
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  *	Linux INET6 implementation
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@@ -5,11 +6,6 @@
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  *	Authors:
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  *	Pedro Roque		<roque@di.fc.ul.pt>
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  *	Mike Shaver		<shaver@ingenia.com>
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- *
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- *	This program is free software; you can redistribute it and/or
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- *      modify it under the terms of the GNU General Public License
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- *      as published by the Free Software Foundation; either version
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- *      2 of the License, or (at your option) any later version.
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  */
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10
 
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 /*
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@@ -77,12 +73,15 @@
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 		      const struct net_device *dev,
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 		      __u32 *hash_rnd);
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 static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey);
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+static bool ndisc_allow_add(const struct net_device *dev,
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+			    struct netlink_ext_ack *extack);
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 static int ndisc_constructor(struct neighbour *neigh);
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 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
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 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
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 static int pndisc_constructor(struct pneigh_entry *n);
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 static void pndisc_destructor(struct pneigh_entry *n);
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 static void pndisc_redo(struct sk_buff *skb);
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+static int ndisc_is_multicast(const void *pkey);
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 static const struct neigh_ops ndisc_generic_ops = {
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 	.family =		AF_INET6,
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@@ -117,6 +116,8 @@
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 	.pconstructor =	pndisc_constructor,
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 	.pdestructor =	pndisc_destructor,
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 	.proxy_redo =	pndisc_redo,
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+	.is_multicast =	ndisc_is_multicast,
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+	.allow_add  =   ndisc_allow_add,
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 	.id =		"ndisc_cache",
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 	.parms = {
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 		.tbl			= &nd_tbl,
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@@ -195,7 +196,8 @@
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 static inline int ndisc_is_useropt(const struct net_device *dev,
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 				   struct nd_opt_hdr *opt)
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 {
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-	return opt->nd_opt_type == ND_OPT_RDNSS ||
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+	return opt->nd_opt_type == ND_OPT_PREFIX_INFO ||
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+		opt->nd_opt_type == ND_OPT_RDNSS ||
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 		opt->nd_opt_type == ND_OPT_DNSSL ||
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 		opt->nd_opt_type == ND_OPT_CAPTIVE_PORTAL ||
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 		opt->nd_opt_type == ND_OPT_PREF64 ||
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@@ -392,6 +394,20 @@
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 		return;
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 	addrconf_addr_solict_mult(addr, &maddr);
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 	ipv6_dev_mc_dec(dev, &maddr);
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+}
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+
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+/* called with rtnl held */
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+static bool ndisc_allow_add(const struct net_device *dev,
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+			    struct netlink_ext_ack *extack)
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+{
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+	struct inet6_dev *idev = __in6_dev_get(dev);
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+
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+	if (!idev || idev->cnf.disable_ipv6) {
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+		NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device");
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+		return false;
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+	}
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+
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+	return true;
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 }
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 static struct sk_buff *ndisc_alloc_skb(struct net_device *dev,
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@@ -1274,12 +1290,11 @@
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 	    !in6_dev->cnf.accept_ra_rtr_pref)
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 		pref = ICMPV6_ROUTER_PREF_MEDIUM;
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 #endif
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-
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+	/* routes added from RAs do not use nexthop objects */
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 	rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev);
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-
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 	if (rt) {
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-		neigh = ip6_neigh_lookup(&rt->fib6_nh.nh_gw,
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-					 rt->fib6_nh.nh_dev, NULL,
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+		neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6,
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+					 rt->fib6_nh->fib_nh_dev, NULL,
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 					  &ipv6_hdr(skb)->saddr);
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 		if (!neigh) {
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 			ND_PRINTK(0, err,
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@@ -1290,7 +1305,7 @@
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 		}
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 	}
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 	if (rt && lifetime == 0) {
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-		ip6_del_rt(net, rt);
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+		ip6_del_rt(net, rt, false);
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 		rt = NULL;
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 	}
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@@ -1308,8 +1323,8 @@
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 			return;
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 		}
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-		neigh = ip6_neigh_lookup(&rt->fib6_nh.nh_gw,
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-					 rt->fib6_nh.nh_dev, NULL,
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+		neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6,
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+					 rt->fib6_nh->fib_nh_dev, NULL,
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 					  &ipv6_hdr(skb)->saddr);
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 		if (!neigh) {
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 			ND_PRINTK(0, err,
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@@ -1347,8 +1362,8 @@
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 		if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
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 			rtime = (rtime*HZ)/1000;
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-			if (rtime < HZ/10)
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-				rtime = HZ/10;
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+			if (rtime < HZ/100)
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+				rtime = HZ/100;
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 			NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime);
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 			in6_dev->tstamp = jiffies;
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 			send_ifinfo_notify = true;
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@@ -1535,7 +1550,7 @@
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 	if (!ndopts.nd_opts_rh) {
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 		ip6_redirect_no_header(skb, dev_net(skb->dev),
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-					skb->dev->ifindex, 0);
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+					skb->dev->ifindex);
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 		return;
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 	}
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@@ -1694,6 +1709,11 @@
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 	kfree_skb(skb);
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 }
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+static int ndisc_is_multicast(const void *pkey)
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+{
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+	return ipv6_addr_is_multicast((struct in6_addr *)pkey);
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+}
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+
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 static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb)
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 {
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 	struct inet6_dev *idev = __in6_dev_get(skb->dev);
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@@ -1771,7 +1791,7 @@
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 	case NETDEV_CHANGEADDR:
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 		neigh_changeaddr(&nd_tbl, dev);
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 		fib6_run_gc(0, net, false);
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-		/* fallthrough */
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+		fallthrough;
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 	case NETDEV_UP:
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 		idev = in6_dev_get(dev);
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 		if (!idev)
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@@ -1785,6 +1805,8 @@
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 		change_info = ptr;
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 		if (change_info->flags_changed & IFF_NOARP)
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 			neigh_changeaddr(&nd_tbl, dev);
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+		if (!netif_carrier_ok(dev))
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+			neigh_carrier_down(&nd_tbl, dev);
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 		break;
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 	case NETDEV_DOWN:
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 		neigh_ifdown(&nd_tbl, dev);
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@@ -1821,7 +1843,8 @@
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 	}
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 }
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-int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
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+int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void *buffer,
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+		size_t *lenp, loff_t *ppos)
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 {
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 	struct net_device *dev = ctl->extra1;
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 	struct inet6_dev *idev;