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hc
2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/net/ipv4/arp.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /* linux/net/ipv4/arp.c
23  *
34  * Copyright (C) 1994 by Florian  La Roche
....@@ -6,11 +7,6 @@
67  * which is used to convert IP addresses (or in the future maybe other
78  * high-level addresses) into a low-level hardware address (like an Ethernet
89  * address).
9
- *
10
- * This program is free software; you can redistribute it and/or
11
- * modify it under the terms of the GNU General Public License
12
- * as published by the Free Software Foundation; either version
13
- * 2 of the License, or (at your option) any later version.
1410  *
1511  * Fixes:
1612  *		Alan Cox	:	Removed the Ethernet assumptions in
....@@ -129,6 +125,7 @@
129125 static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb);
130126 static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb);
131127 static void parp_redo(struct sk_buff *skb);
128
+static int arp_is_multicast(const void *pkey);
132129 
133130 static const struct neigh_ops arp_generic_ops = {
134131 	.family =		AF_INET,
....@@ -160,6 +157,7 @@
160157 	.key_eq		= arp_key_eq,
161158 	.constructor	= arp_constructor,
162159 	.proxy_redo	= parp_redo,
160
+	.is_multicast	= arp_is_multicast,
163161 	.id		= "arp_cache",
164162 	.parms		= {
165163 		.tbl			= &arp_tbl,
....@@ -932,6 +930,10 @@
932930 	arp_process(dev_net(skb->dev), NULL, skb);
933931 }
934932 
933
+static int arp_is_multicast(const void *pkey)
934
+{
935
+	return ipv4_is_multicast(*((__be32 *)pkey));
936
+}
935937 
936938 /*
937939  *	Receive an arp request from the device layer.
....@@ -1114,13 +1116,18 @@
11141116 	return err;
11151117 }
11161118 
1117
-static int arp_invalidate(struct net_device *dev, __be32 ip)
1119
+int arp_invalidate(struct net_device *dev, __be32 ip, bool force)
11181120 {
11191121 	struct neighbour *neigh = neigh_lookup(&arp_tbl, &ip, dev);
11201122 	int err = -ENXIO;
11211123 	struct neigh_table *tbl = &arp_tbl;
11221124 
11231125 	if (neigh) {
1126
+		if ((neigh->nud_state & NUD_VALID) && !force) {
1127
+			neigh_release(neigh);
1128
+			return 0;
1129
+		}
1130
+
11241131 		if (neigh->nud_state & ~NUD_NOARP)
11251132 			err = neigh_update(neigh, NULL, NUD_FAILED,
11261133 					   NEIGH_UPDATE_F_OVERRIDE|
....@@ -1167,7 +1174,7 @@
11671174 		if (!dev)
11681175 			return -EINVAL;
11691176 	}
1170
-	return arp_invalidate(dev, ip);
1177
+	return arp_invalidate(dev, ip, true);
11711178 }
11721179 
11731180 /*
....@@ -1185,7 +1192,7 @@
11851192 	case SIOCSARP:
11861193 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
11871194 			return -EPERM;
1188
-		/* fall through */
1195
+		fallthrough;
11891196 	case SIOCGARP:
11901197 		err = copy_from_user(&r, arg, sizeof(struct arpreq));
11911198 		if (err)
....@@ -1255,6 +1262,8 @@
12551262 		change_info = ptr;
12561263 		if (change_info->flags_changed & IFF_NOARP)
12571264 			neigh_changeaddr(&arp_tbl, dev);
1265
+		if (!netif_carrier_ok(dev))
1266
+			neigh_carrier_down(&arp_tbl, dev);
12581267 		break;
12591268 	default:
12601269 		break;