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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/net/ipv6/ip6_tunnel.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *	IPv6 tunneling device
34  *	Linux INET6 implementation
....@@ -10,12 +11,6 @@
1011  *      linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
1112  *
1213  *      RFC 2473
13
- *
14
- *	This program is free software; you can redistribute it and/or
15
- *      modify it under the terms of the GNU General Public License
16
- *      as published by the Free Software Foundation; either version
17
- *      2 of the License, or (at your option) any later version.
18
- *
1914  */
2015 
2116 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
....@@ -94,6 +89,11 @@
9489 	struct ip6_tnl __rcu *collect_md_tun;
9590 };
9691 
92
+static inline int ip6_tnl_mpls_supported(void)
93
+{
94
+	return IS_ENABLED(CONFIG_MPLS);
95
+}
96
+
9797 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
9898 {
9999 	struct pcpu_sw_netstats tmp, sum = { 0 };
....@@ -124,8 +124,13 @@
124124 	return &dev->stats;
125125 }
126126 
127
+#define for_each_ip6_tunnel_rcu(start) \
128
+	for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
129
+
127130 /**
128131  * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
132
+ *   @net: network namespace
133
+ *   @link: ifindex of underlying interface
129134  *   @remote: the address of the tunnel exit-point
130135  *   @local: the address of the tunnel entry-point
131136  *
....@@ -135,40 +140,56 @@
135140  *   else %NULL
136141  **/
137142 
138
-#define for_each_ip6_tunnel_rcu(start) \
139
-	for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
140
-
141143 static struct ip6_tnl *
142
-ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
144
+ip6_tnl_lookup(struct net *net, int link,
145
+	       const struct in6_addr *remote, const struct in6_addr *local)
143146 {
144147 	unsigned int hash = HASH(remote, local);
145
-	struct ip6_tnl *t;
148
+	struct ip6_tnl *t, *cand = NULL;
146149 	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
147150 	struct in6_addr any;
148151 
149152 	for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
150
-		if (ipv6_addr_equal(local, &t->parms.laddr) &&
151
-		    ipv6_addr_equal(remote, &t->parms.raddr) &&
152
-		    (t->dev->flags & IFF_UP))
153
+		if (!ipv6_addr_equal(local, &t->parms.laddr) ||
154
+		    !ipv6_addr_equal(remote, &t->parms.raddr) ||
155
+		    !(t->dev->flags & IFF_UP))
156
+			continue;
157
+
158
+		if (link == t->parms.link)
153159 			return t;
160
+		else
161
+			cand = t;
154162 	}
155163 
156164 	memset(&any, 0, sizeof(any));
157165 	hash = HASH(&any, local);
158166 	for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
159
-		if (ipv6_addr_equal(local, &t->parms.laddr) &&
160
-		    ipv6_addr_any(&t->parms.raddr) &&
161
-		    (t->dev->flags & IFF_UP))
167
+		if (!ipv6_addr_equal(local, &t->parms.laddr) ||
168
+		    !ipv6_addr_any(&t->parms.raddr) ||
169
+		    !(t->dev->flags & IFF_UP))
170
+			continue;
171
+
172
+		if (link == t->parms.link)
162173 			return t;
174
+		else if (!cand)
175
+			cand = t;
163176 	}
164177 
165178 	hash = HASH(remote, &any);
166179 	for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
167
-		if (ipv6_addr_equal(remote, &t->parms.raddr) &&
168
-		    ipv6_addr_any(&t->parms.laddr) &&
169
-		    (t->dev->flags & IFF_UP))
180
+		if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
181
+		    !ipv6_addr_any(&t->parms.laddr) ||
182
+		    !(t->dev->flags & IFF_UP))
183
+			continue;
184
+
185
+		if (link == t->parms.link)
170186 			return t;
187
+		else if (!cand)
188
+			cand = t;
171189 	}
190
+
191
+	if (cand)
192
+		return cand;
172193 
173194 	t = rcu_dereference(ip6n->collect_md_tun);
174195 	if (t && t->dev->flags & IFF_UP)
....@@ -281,8 +302,8 @@
281302 
282303 /**
283304  * ip6_tnl_create - create a new tunnel
305
+ *   @net: network namespace
284306  *   @p: tunnel parameters
285
- *   @pt: pointer to new tunnel
286307  *
287308  * Description:
288309  *   Create tunnel matching given parameters.
....@@ -330,6 +351,7 @@
330351 
331352 /**
332353  * ip6_tnl_locate - find or create tunnel matching given parameters
354
+ *   @net: network namespace
333355  *   @p: tunnel parameters
334356  *   @create: != 0 if allowed to create new tunnel if no match found
335357  *
....@@ -355,7 +377,8 @@
355377 	     (t = rtnl_dereference(*tp)) != NULL;
356378 	     tp = &t->next) {
357379 		if (ipv6_addr_equal(local, &t->parms.laddr) &&
358
-		    ipv6_addr_equal(remote, &t->parms.raddr)) {
380
+		    ipv6_addr_equal(remote, &t->parms.raddr) &&
381
+		    p->link == t->parms.link) {
359382 			if (create)
360383 				return ERR_PTR(-EEXIST);
361384 
....@@ -420,7 +443,7 @@
420443 				break;
421444 			optlen = 8;
422445 		} else if (nexthdr == NEXTHDR_AUTH) {
423
-			optlen = (hdr->hdrlen + 2) << 2;
446
+			optlen = ipv6_authlen(hdr);
424447 		} else {
425448 			optlen = ipv6_optlen(hdr);
426449 		}
....@@ -489,7 +512,7 @@
489512 	   processing of the error. */
490513 
491514 	rcu_read_lock();
492
-	t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
515
+	t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
493516 	if (!t)
494517 		goto out;
495518 
....@@ -500,8 +523,6 @@
500523 	err = 0;
501524 
502525 	switch (*type) {
503
-		struct ipv6_tlv_tnl_enc_lim *tel;
504
-		__u32 mtu, teli;
505526 	case ICMPV6_DEST_UNREACH:
506527 		net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
507528 				    t->parms.name);
....@@ -514,7 +535,10 @@
514535 			rel_msg = 1;
515536 		}
516537 		break;
517
-	case ICMPV6_PARAMPROB:
538
+	case ICMPV6_PARAMPROB: {
539
+		struct ipv6_tlv_tnl_enc_lim *tel;
540
+		__u32 teli;
541
+
518542 		teli = 0;
519543 		if ((*code) == ICMPV6_HDR_FIELD)
520544 			teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
....@@ -531,7 +555,10 @@
531555 					    t->parms.name);
532556 		}
533557 		break;
534
-	case ICMPV6_PKT_TOOBIG:
558
+	}
559
+	case ICMPV6_PKT_TOOBIG: {
560
+		__u32 mtu;
561
+
535562 		ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
536563 				sock_net_uid(net, NULL));
537564 		mtu = *info - offset;
....@@ -545,6 +572,7 @@
545572 			rel_msg = 1;
546573 		}
547574 		break;
575
+	}
548576 	case NDISC_REDIRECT:
549577 		ip6_redirect(skb, net, skb->dev->ifindex, 0,
550578 			     sock_net_uid(net, NULL));
....@@ -696,6 +724,20 @@
696724 	return 0;
697725 }
698726 
727
+static int
728
+mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
729
+	    u8 type, u8 code, int offset, __be32 info)
730
+{
731
+	__u32 rel_info = ntohl(info);
732
+	int err, rel_msg = 0;
733
+	u8 rel_type = type;
734
+	u8 rel_code = code;
735
+
736
+	err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
737
+			  &rel_msg, &rel_info, offset);
738
+	return err;
739
+}
740
+
699741 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
700742 				       const struct ipv6hdr *ipv6h,
701743 				       struct sk_buff *skb)
....@@ -716,6 +758,14 @@
716758 		ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
717759 
718760 	return IP6_ECN_decapsulate(ipv6h, skb);
761
+}
762
+
763
+static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
764
+					       const struct ipv6hdr *ipv6h,
765
+					       struct sk_buff *skb)
766
+{
767
+	/* ECN is not supported in AF_MPLS */
768
+	return 0;
719769 }
720770 
721771 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
....@@ -887,6 +937,11 @@
887937 	.proto = htons(ETH_P_IP),
888938 };
889939 
940
+static const struct tnl_ptk_info tpi_mpls = {
941
+	/* no tunnel info required for mplsip6. */
942
+	.proto = htons(ETH_P_MPLS_UC),
943
+};
944
+
890945 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
891946 		      const struct tnl_ptk_info *tpi,
892947 		      int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
....@@ -899,7 +954,7 @@
899954 	int ret = -1;
900955 
901956 	rcu_read_lock();
902
-	t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
957
+	t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
903958 
904959 	if (t) {
905960 		u8 tproto = READ_ONCE(t->parms.proto);
....@@ -942,6 +997,12 @@
942997 {
943998 	return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
944999 			  ip6ip6_dscp_ecn_decapsulate);
1000
+}
1001
+
1002
+static int mplsip6_rcv(struct sk_buff *skb)
1003
+{
1004
+	return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
1005
+			  mplsip6_dscp_ecn_decapsulate);
9451006 }
9461007 
9471008 struct ipv6_tel_txoption {
....@@ -1206,8 +1267,8 @@
12061267 	 */
12071268 	max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
12081269 			+ dst->header_len + t->hlen;
1209
-	if (max_headroom > dev->needed_headroom)
1210
-		dev->needed_headroom = max_headroom;
1270
+	if (max_headroom > READ_ONCE(dev->needed_headroom))
1271
+		WRITE_ONCE(dev->needed_headroom, max_headroom);
12111272 
12121273 	err = ip6_tnl_encap(skb, t, &proto, fl6);
12131274 	if (err)
....@@ -1239,22 +1300,22 @@
12391300 EXPORT_SYMBOL(ip6_tnl_xmit);
12401301 
12411302 static inline int
1242
-ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1303
+ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1304
+		u8 protocol)
12431305 {
12441306 	struct ip6_tnl *t = netdev_priv(dev);
1307
+	struct ipv6hdr *ipv6h;
12451308 	const struct iphdr  *iph;
12461309 	int encap_limit = -1;
1310
+	__u16 offset;
12471311 	struct flowi6 fl6;
1248
-	__u8 dsfield;
1312
+	__u8 dsfield, orig_dsfield;
12491313 	__u32 mtu;
12501314 	u8 tproto;
12511315 	int err;
12521316 
1253
-	iph = ip_hdr(skb);
1254
-	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1255
-
12561317 	tproto = READ_ONCE(t->parms.proto);
1257
-	if (tproto != IPPROTO_IPIP && tproto != 0)
1318
+	if (tproto != protocol && tproto != 0)
12581319 		return -1;
12591320 
12601321 	if (t->parms.collect_md) {
....@@ -1267,129 +1328,102 @@
12671328 			return -1;
12681329 		key = &tun_info->key;
12691330 		memset(&fl6, 0, sizeof(fl6));
1270
-		fl6.flowi6_proto = IPPROTO_IPIP;
1331
+		fl6.flowi6_proto = protocol;
12711332 		fl6.saddr = key->u.ipv6.src;
12721333 		fl6.daddr = key->u.ipv6.dst;
12731334 		fl6.flowlabel = key->label;
12741335 		dsfield =  key->tos;
1336
+		switch (protocol) {
1337
+		case IPPROTO_IPIP:
1338
+			iph = ip_hdr(skb);
1339
+			orig_dsfield = ipv4_get_dsfield(iph);
1340
+			break;
1341
+		case IPPROTO_IPV6:
1342
+			ipv6h = ipv6_hdr(skb);
1343
+			orig_dsfield = ipv6_get_dsfield(ipv6h);
1344
+			break;
1345
+		default:
1346
+			orig_dsfield = dsfield;
1347
+			break;
1348
+		}
12751349 	} else {
12761350 		if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
12771351 			encap_limit = t->parms.encap_limit;
1352
+		if (protocol == IPPROTO_IPV6) {
1353
+			offset = ip6_tnl_parse_tlv_enc_lim(skb,
1354
+						skb_network_header(skb));
1355
+			/* ip6_tnl_parse_tlv_enc_lim() might have
1356
+			 * reallocated skb->head
1357
+			 */
1358
+			if (offset > 0) {
1359
+				struct ipv6_tlv_tnl_enc_lim *tel;
12781360 
1279
-		memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1280
-		fl6.flowi6_proto = IPPROTO_IPIP;
1281
-
1282
-		if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1283
-			dsfield = ipv4_get_dsfield(iph);
1284
-		else
1285
-			dsfield = ip6_tclass(t->parms.flowinfo);
1286
-		if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1287
-			fl6.flowi6_mark = skb->mark;
1288
-		else
1289
-			fl6.flowi6_mark = t->parms.fwmark;
1290
-	}
1291
-
1292
-	fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1293
-	dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph));
1294
-
1295
-	if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1296
-		return -1;
1297
-
1298
-	skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1299
-
1300
-	err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1301
-			   IPPROTO_IPIP);
1302
-	if (err != 0) {
1303
-		/* XXX: send ICMP error even if DF is not set. */
1304
-		if (err == -EMSGSIZE)
1305
-			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1306
-				  htonl(mtu));
1307
-		return -1;
1308
-	}
1309
-
1310
-	return 0;
1311
-}
1312
-
1313
-static inline int
1314
-ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1315
-{
1316
-	struct ip6_tnl *t = netdev_priv(dev);
1317
-	struct ipv6hdr *ipv6h;
1318
-	int encap_limit = -1;
1319
-	__u16 offset;
1320
-	struct flowi6 fl6;
1321
-	__u8 dsfield;
1322
-	__u32 mtu;
1323
-	u8 tproto;
1324
-	int err;
1325
-
1326
-	ipv6h = ipv6_hdr(skb);
1327
-	tproto = READ_ONCE(t->parms.proto);
1328
-	if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1329
-	    ip6_tnl_addr_conflict(t, ipv6h))
1330
-		return -1;
1331
-
1332
-	if (t->parms.collect_md) {
1333
-		struct ip_tunnel_info *tun_info;
1334
-		const struct ip_tunnel_key *key;
1335
-
1336
-		tun_info = skb_tunnel_info(skb);
1337
-		if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1338
-			     ip_tunnel_info_af(tun_info) != AF_INET6))
1339
-			return -1;
1340
-		key = &tun_info->key;
1341
-		memset(&fl6, 0, sizeof(fl6));
1342
-		fl6.flowi6_proto = IPPROTO_IPV6;
1343
-		fl6.saddr = key->u.ipv6.src;
1344
-		fl6.daddr = key->u.ipv6.dst;
1345
-		fl6.flowlabel = key->label;
1346
-		dsfield = key->tos;
1347
-	} else {
1348
-		offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1349
-		/* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
1350
-		ipv6h = ipv6_hdr(skb);
1351
-		if (offset > 0) {
1352
-			struct ipv6_tlv_tnl_enc_lim *tel;
1353
-
1354
-			tel = (void *)&skb_network_header(skb)[offset];
1355
-			if (tel->encap_limit == 0) {
1356
-				icmpv6_send(skb, ICMPV6_PARAMPROB,
1357
-					    ICMPV6_HDR_FIELD, offset + 2);
1358
-				return -1;
1361
+				tel = (void *)&skb_network_header(skb)[offset];
1362
+				if (tel->encap_limit == 0) {
1363
+					icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
1364
+							ICMPV6_HDR_FIELD, offset + 2);
1365
+					return -1;
1366
+				}
1367
+				encap_limit = tel->encap_limit - 1;
13591368 			}
1360
-			encap_limit = tel->encap_limit - 1;
1361
-		} else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
1362
-			encap_limit = t->parms.encap_limit;
13631369 		}
13641370 
13651371 		memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1366
-		fl6.flowi6_proto = IPPROTO_IPV6;
1372
+		fl6.flowi6_proto = protocol;
13671373 
1368
-		if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1369
-			dsfield = ipv6_get_dsfield(ipv6h);
1370
-		else
1371
-			dsfield = ip6_tclass(t->parms.flowinfo);
1372
-		if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1373
-			fl6.flowlabel |= ip6_flowlabel(ipv6h);
13741374 		if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
13751375 			fl6.flowi6_mark = skb->mark;
13761376 		else
13771377 			fl6.flowi6_mark = t->parms.fwmark;
1378
+		switch (protocol) {
1379
+		case IPPROTO_IPIP:
1380
+			iph = ip_hdr(skb);
1381
+			orig_dsfield = ipv4_get_dsfield(iph);
1382
+			if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1383
+				dsfield = orig_dsfield;
1384
+			else
1385
+				dsfield = ip6_tclass(t->parms.flowinfo);
1386
+			break;
1387
+		case IPPROTO_IPV6:
1388
+			ipv6h = ipv6_hdr(skb);
1389
+			orig_dsfield = ipv6_get_dsfield(ipv6h);
1390
+			if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1391
+				dsfield = orig_dsfield;
1392
+			else
1393
+				dsfield = ip6_tclass(t->parms.flowinfo);
1394
+			if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1395
+				fl6.flowlabel |= ip6_flowlabel(ipv6h);
1396
+			break;
1397
+		default:
1398
+			orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1399
+			break;
1400
+		}
13781401 	}
13791402 
13801403 	fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1381
-	dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h));
1404
+	dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
13821405 
13831406 	if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
13841407 		return -1;
13851408 
1386
-	skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1409
+	skb_set_inner_ipproto(skb, protocol);
13871410 
13881411 	err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1389
-			   IPPROTO_IPV6);
1412
+			   protocol);
13901413 	if (err != 0) {
1414
+		/* XXX: send ICMP error even if DF is not set. */
13911415 		if (err == -EMSGSIZE)
1392
-			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1416
+			switch (protocol) {
1417
+			case IPPROTO_IPIP:
1418
+				icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1419
+					      ICMP_FRAG_NEEDED, htonl(mtu));
1420
+				break;
1421
+			case IPPROTO_IPV6:
1422
+				icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1423
+				break;
1424
+			default:
1425
+				break;
1426
+			}
13931427 		return -1;
13941428 	}
13951429 
....@@ -1401,6 +1435,7 @@
14011435 {
14021436 	struct ip6_tnl *t = netdev_priv(dev);
14031437 	struct net_device_stats *stats = &t->dev->stats;
1438
+	u8 ipproto;
14041439 	int ret;
14051440 
14061441 	if (!pskb_inet_may_pull(skb))
....@@ -1408,15 +1443,21 @@
14081443 
14091444 	switch (skb->protocol) {
14101445 	case htons(ETH_P_IP):
1411
-		ret = ip4ip6_tnl_xmit(skb, dev);
1446
+		ipproto = IPPROTO_IPIP;
14121447 		break;
14131448 	case htons(ETH_P_IPV6):
1414
-		ret = ip6ip6_tnl_xmit(skb, dev);
1449
+		if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1450
+			goto tx_err;
1451
+		ipproto = IPPROTO_IPV6;
1452
+		break;
1453
+	case htons(ETH_P_MPLS_UC):
1454
+		ipproto = IPPROTO_MPLS;
14151455 		break;
14161456 	default:
14171457 		goto tx_err;
14181458 	}
14191459 
1460
+	ret = ipxip6_tnl_xmit(skb, dev, ipproto);
14201461 	if (ret < 0)
14211462 		goto tx_err;
14221463 
....@@ -1432,9 +1473,11 @@
14321473 static void ip6_tnl_link_config(struct ip6_tnl *t)
14331474 {
14341475 	struct net_device *dev = t->dev;
1476
+	struct net_device *tdev = NULL;
14351477 	struct __ip6_tnl_parm *p = &t->parms;
14361478 	struct flowi6 *fl6 = &t->fl.u.ip6;
14371479 	int t_hlen;
1480
+	int mtu;
14381481 
14391482 	memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
14401483 	memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
....@@ -1469,22 +1512,26 @@
14691512 		struct rt6_info *rt = rt6_lookup(t->net,
14701513 						 &p->raddr, &p->laddr,
14711514 						 p->link, NULL, strict);
1472
-
1473
-		if (!rt)
1474
-			return;
1475
-
1476
-		if (rt->dst.dev) {
1477
-			dev->hard_header_len = rt->dst.dev->hard_header_len +
1478
-				t_hlen;
1479
-
1480
-			dev->mtu = rt->dst.dev->mtu - t_hlen;
1481
-			if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1482
-				dev->mtu -= 8;
1483
-
1484
-			if (dev->mtu < IPV6_MIN_MTU)
1485
-				dev->mtu = IPV6_MIN_MTU;
1515
+		if (rt) {
1516
+			tdev = rt->dst.dev;
1517
+			ip6_rt_put(rt);
14861518 		}
1487
-		ip6_rt_put(rt);
1519
+
1520
+		if (!tdev && p->link)
1521
+			tdev = __dev_get_by_index(t->net, p->link);
1522
+
1523
+		if (tdev) {
1524
+			dev->hard_header_len = tdev->hard_header_len + t_hlen;
1525
+			mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1526
+
1527
+			mtu = mtu - t_hlen;
1528
+			if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1529
+				mtu -= 8;
1530
+
1531
+			if (mtu < IPV6_MIN_MTU)
1532
+				mtu = IPV6_MIN_MTU;
1533
+			WRITE_ONCE(dev->mtu, mtu);
1534
+		}
14881535 	}
14891536 }
14901537 
....@@ -1809,6 +1856,7 @@
18091856 static void ip6_tnl_dev_setup(struct net_device *dev)
18101857 {
18111858 	dev->netdev_ops = &ip6_tnl_netdev_ops;
1859
+	dev->header_ops = &ip_tunnel_header_ops;
18121860 	dev->needs_free_netdev = true;
18131861 	dev->priv_destructor = ip6_dev_free;
18141862 
....@@ -2199,6 +2247,12 @@
21992247 	.priority	=	1,
22002248 };
22012249 
2250
+static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2251
+	.handler	= mplsip6_rcv,
2252
+	.err_handler	= mplsip6_err,
2253
+	.priority	=	1,
2254
+};
2255
+
22022256 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
22032257 {
22042258 	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
....@@ -2323,6 +2377,15 @@
23232377 		pr_err("%s: can't register ip6ip6\n", __func__);
23242378 		goto out_ip6ip6;
23252379 	}
2380
+
2381
+	if (ip6_tnl_mpls_supported()) {
2382
+		err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2383
+		if (err < 0) {
2384
+			pr_err("%s: can't register mplsip6\n", __func__);
2385
+			goto out_mplsip6;
2386
+		}
2387
+	}
2388
+
23262389 	err = rtnl_link_register(&ip6_link_ops);
23272390 	if (err < 0)
23282391 		goto rtnl_link_failed;
....@@ -2330,6 +2393,9 @@
23302393 	return 0;
23312394 
23322395 rtnl_link_failed:
2396
+	if (ip6_tnl_mpls_supported())
2397
+		xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2398
+out_mplsip6:
23332399 	xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
23342400 out_ip6ip6:
23352401 	xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
....@@ -2352,6 +2418,9 @@
23522418 	if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
23532419 		pr_info("%s: can't deregister ip6ip6\n", __func__);
23542420 
2421
+	if (ip6_tnl_mpls_supported() &&
2422
+	    xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2423
+		pr_info("%s: can't deregister mplsip6\n", __func__);
23552424 	unregister_pernet_device(&ip6_tnl_net_ops);
23562425 }
23572426