Add kernel support for MAP-E FMRs

SVN-Revision: 40822

1 files changed, 490 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.12/666-Add-support-for-MAP-E-FMRs-mesh-mode.patch b/target/linux/generic/patches-3.12/666-Add-support-for-MAP-E-FMRs-mesh-mode.patch
new file mode 100644
index 0000000..2397546
--- /dev/null
+++ b/target/linux/generic/patches-3.12/666-Add-support-for-MAP-E-FMRs-mesh-mode.patch
@@ -0,0 +1,490 @@
+From 775d6fe74d1eaec2ba387535b068dde2dc89de9e Mon Sep 17 00:00:00 2001
+From: Steven Barth <steven@midlink.org>
+Date: Thu, 22 May 2014 09:49:05 +0200
+Subject: [PATCH] Add support for MAP-E FMRs (mesh mode)
+
+MAP-E FMRs (draft-ietf-softwire-map-10) are rules for IPv4-communication
+between MAP CEs (mesh mode) without the need to forward such data to a
+border relay. This is similar to how 6rd works but for IPv4 over IPv6.
+
+Signed-off-by: Steven Barth <cyrus@openwrt.org>
+---
+ include/net/ip6_tunnel.h       |  13 ++
+ include/uapi/linux/if_tunnel.h |  13 ++
+ net/ipv6/ip6_tunnel.c          | 276 +++++++++++++++++++++++++++++++++++++++--
+ 3 files changed, 291 insertions(+), 11 deletions(-)
+
+diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h
+index a5593da..414f5a1 100644
+--- a/include/net/ip6_tunnel.h
++++ b/include/net/ip6_tunnel.h
+@@ -15,6 +15,18 @@
+ /* determine capability on a per-packet basis */
+ #define IP6_TNL_F_CAP_PER_PACKET 0x40000
+ 
++/* IPv6 tunnel FMR */
++struct __ip6_tnl_fmr {
++	struct __ip6_tnl_fmr *next; /* next fmr in list */
++	struct in6_addr ip6_prefix;
++	struct in_addr ip4_prefix;
++
++	__u8 ip6_prefix_len;
++	__u8 ip4_prefix_len;
++	__u8 ea_len;
++	__u8 offset;
++};
++
+ struct __ip6_tnl_parm {
+ 	char name[IFNAMSIZ];	/* name of tunnel device */
+ 	int link;		/* ifindex of underlying L2 interface */
+@@ -25,6 +37,7 @@ struct __ip6_tnl_parm {
+ 	__u32 flags;		/* tunnel flags */
+ 	struct in6_addr laddr;	/* local tunnel end-point address */
+ 	struct in6_addr raddr;	/* remote tunnel end-point address */
++	struct __ip6_tnl_fmr *fmrs;	/* FMRs */
+ 
+ 	__be16			i_flags;
+ 	__be16			o_flags;
+diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h
+index aee73d0..c5b25d4 100644
+--- a/include/uapi/linux/if_tunnel.h
++++ b/include/uapi/linux/if_tunnel.h
+@@ -53,10 +53,23 @@ enum {
+ 	IFLA_IPTUN_6RD_RELAY_PREFIX,
+ 	IFLA_IPTUN_6RD_PREFIXLEN,
+ 	IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
++	IFLA_IPTUN_FMRS,
+ 	__IFLA_IPTUN_MAX,
+ };
+ #define IFLA_IPTUN_MAX	(__IFLA_IPTUN_MAX - 1)
+ 
++enum {
++	IFLA_IPTUN_FMR_UNSPEC,
++	IFLA_IPTUN_FMR_IP6_PREFIX,
++	IFLA_IPTUN_FMR_IP4_PREFIX,
++	IFLA_IPTUN_FMR_IP6_PREFIX_LEN,
++	IFLA_IPTUN_FMR_IP4_PREFIX_LEN,
++	IFLA_IPTUN_FMR_EA_LEN,
++	IFLA_IPTUN_FMR_OFFSET,
++	__IFLA_IPTUN_FMR_MAX,
++};
++#define IFLA_IPTUN_FMR_MAX (__IFLA_IPTUN_FMR_MAX - 1)
++
+ /* SIT-mode i_flags */
+ #define	SIT_ISATAP	0x0001
+ 
+diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
+index b05b609..c2216b0 100644
+--- a/net/ipv6/ip6_tunnel.c
++++ b/net/ipv6/ip6_tunnel.c
+@@ -16,6 +16,8 @@
+  *      as published by the Free Software Foundation; either version
+  *      2 of the License, or (at your option) any later version.
+  *
++ *	Changes:
++ * Steven Barth <cyrus@openwrt.org>:		MAP-E FMR support
+  */
+ 
+ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+@@ -76,11 +78,9 @@ static bool log_ecn_error = true;
+ module_param(log_ecn_error, bool, 0644);
+ MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+ 
+-static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
++static u32 HASH(const struct in6_addr *addr)
+ {
+-	u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
+-
+-	return hash_32(hash, HASH_SIZE_SHIFT);
++	return hash_32(ipv6_addr_hash(addr), HASH_SIZE_SHIFT);
+ }
+ 
+ static int ip6_tnl_dev_init(struct net_device *dev);
+@@ -179,15 +179,24 @@ EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
+ static struct ip6_tnl *
+ ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
+ {
+-	unsigned int hash = HASH(remote, local);
++	unsigned int hash = HASH(local);
+ 	struct ip6_tnl *t;
+ 	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
++	struct __ip6_tnl_fmr *fmr;
+ 
+ 	for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
+-		if (ipv6_addr_equal(local, &t->parms.laddr) &&
+-		    ipv6_addr_equal(remote, &t->parms.raddr) &&
+-		    (t->dev->flags & IFF_UP))
++		if (!ipv6_addr_equal(local, &t->parms.laddr) ||
++				!(t->dev->flags & IFF_UP))
++			continue;
++
++		if (ipv6_addr_equal(remote, &t->parms.raddr))
+ 			return t;
++
++		for (fmr = t->parms.fmrs; fmr; fmr = fmr->next) {
++			if (ipv6_prefix_equal(remote, &fmr->ip6_prefix,
++					fmr->ip6_prefix_len))
++				return t;
++		}
+ 	}
+ 	t = rcu_dereference(ip6n->tnls_wc[0]);
+ 	if (t && (t->dev->flags & IFF_UP))
+@@ -217,7 +226,7 @@ ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
+ 
+ 	if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
+ 		prio = 1;
+-		h = HASH(remote, local);
++		h = HASH(local);
+ 	}
+ 	return &ip6n->tnls[prio][h];
+ }
+@@ -385,6 +394,12 @@ ip6_tnl_dev_uninit(struct net_device *dev)
+ 	struct net *net = t->net;
+ 	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ 
++	while (t->parms.fmrs) {
++		struct __ip6_tnl_fmr *next = t->parms.fmrs->next;
++		kfree(t->parms.fmrs);
++		t->parms.fmrs = next;
++	}
++
+ 	if (dev == ip6n->fb_tnl_dev)
+ 		RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
+ 	else
+@@ -768,6 +783,108 @@ int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
+ }
+ EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
+ 
++
++/**
++ * ip4ip6_fmr_calc - calculate target / source IPv6-address based on FMR
++ *   @dest: destination IPv6 address buffer
++ *   @skb: received socket buffer
++ *   @fmr: MAP FMR
++ *   @xmit: Calculate for xmit or rcv
++ **/
++static void ip4ip6_fmr_calc(struct in6_addr *dest,
++		const struct iphdr *iph, const uint8_t *end,
++		const struct __ip6_tnl_fmr *fmr, bool xmit)
++{
++	int psidlen = fmr->ea_len - (32 - fmr->ip4_prefix_len);
++	u8 *portp = NULL;
++	bool use_dest_addr;
++	const struct iphdr *dsth = iph;
++
++	if ((u8*)dsth >= end)
++		return;
++
++	/* find significant IP header */
++	if (iph->protocol == IPPROTO_ICMP) {
++		struct icmphdr *ih = (struct icmphdr*)(((u8*)dsth) + dsth->ihl * 4);
++		if (ih && ((u8*)&ih[1]) <= end && (
++			ih->type == ICMP_DEST_UNREACH ||
++			ih->type == ICMP_SOURCE_QUENCH ||
++			ih->type == ICMP_TIME_EXCEEDED ||
++			ih->type == ICMP_PARAMETERPROB ||
++			ih->type == ICMP_REDIRECT))
++				dsth = (const struct iphdr*)&ih[1];
++	}
++
++	/* in xmit-path use dest port by default and source port only if
++		this is an ICMP reply to something else; vice versa in rcv-path */
++	use_dest_addr = (xmit && dsth == iph) || (!xmit && dsth != iph);
++
++	/* get dst port */
++	if (((u8*)&dsth[1]) <= end && (
++		dsth->protocol == IPPROTO_UDP ||
++		dsth->protocol == IPPROTO_TCP ||
++		dsth->protocol == IPPROTO_SCTP ||
++		dsth->protocol == IPPROTO_DCCP)) {
++			/* for UDP, TCP, SCTP and DCCP source and dest port
++			follow IPv4 header directly */
++			portp = ((u8*)dsth) + dsth->ihl * 4;
++
++			if (use_dest_addr)
++				portp += sizeof(u16);
++	} else if (iph->protocol == IPPROTO_ICMP) {
++		struct icmphdr *ih = (struct icmphdr*)(((u8*)dsth) + dsth->ihl * 4);
++
++		/* use icmp identifier as port */
++		if (((u8*)&ih) <= end &&
++		    (use_dest_addr && (
++		    ih->type == ICMP_ECHOREPLY ||
++			ih->type == ICMP_TIMESTAMPREPLY ||
++			ih->type == ICMP_INFO_REPLY ||
++			ih->type == ICMP_ADDRESSREPLY)) ||
++			(!use_dest_addr && (
++			ih->type == ICMP_ECHO ||
++			ih->type == ICMP_TIMESTAMP ||
++			ih->type == ICMP_INFO_REQUEST ||
++			ih->type == ICMP_ADDRESS)
++			))
++				portp = (u8*)&ih->un.echo.id;
++	}
++
++	if ((portp && &portp[2] <= end) || psidlen == 0) {
++		int frombyte = fmr->ip6_prefix_len / 8;
++		int fromrem = fmr->ip6_prefix_len % 8;
++		int bytes = sizeof(struct in6_addr) - frombyte;
++		const u32 *addr = (use_dest_addr) ? &iph->daddr : &iph->saddr;
++		u64 eabits = ((u64)ntohl(*addr)) << (32 + fmr->ip4_prefix_len);
++		u64 t = 0;
++
++		/* extract PSID from port and add it to eabits */
++		u16 psidbits = 0;
++		if (psidlen > 0) {
++			psidbits = ((u16)portp[0]) << 8 | ((u16)portp[1]);
++			psidbits >>= 16 - psidlen - fmr->offset;
++			psidbits = (u16)(psidbits << (16 - psidlen));
++			eabits |= ((u64)psidbits) << (48 - (fmr->ea_len - psidlen));
++		}
++
++		/* rewrite destination address */
++		*dest = fmr->ip6_prefix;
++		memcpy(&dest->s6_addr[10], addr, sizeof(*addr));
++		dest->s6_addr16[7] = htons(psidbits >> (16 - psidlen));
++
++		if (bytes > sizeof(u64))
++			bytes = sizeof(u64);
++
++		/* insert eabits */
++		memcpy(&t, &dest->s6_addr[frombyte], bytes);
++		t = be64_to_cpu(t) & ~(((((u64)1) << fmr->ea_len) - 1)
++			<< (64 - fmr->ea_len - fromrem));
++		t = cpu_to_be64(t | (eabits >> fromrem));
++		memcpy(&dest->s6_addr[frombyte], &t, bytes);
++	}
++}
++
++
+ /**
+  * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
+  *   @skb: received socket buffer
+@@ -812,6 +928,26 @@ static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
+ 		skb_reset_network_header(skb);
+ 		skb->protocol = htons(protocol);
+ 		memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
++		if (protocol == ETH_P_IP &&
++			!ipv6_addr_equal(&ipv6h->saddr, &t->parms.raddr)) {
++				/* Packet didn't come from BR, so lookup FMR */
++				struct __ip6_tnl_fmr *fmr;
++				struct in6_addr expected = t->parms.raddr;
++				for (fmr = t->parms.fmrs; fmr; fmr = fmr->next)
++					if (ipv6_prefix_equal(&ipv6h->saddr,
++						&fmr->ip6_prefix, fmr->ip6_prefix_len))
++							break;
++
++				/* Check that IPv6 matches IPv4 source to prevent spoofing */
++				if (fmr)
++					ip4ip6_fmr_calc(&expected, ip_hdr(skb),
++							skb_tail_pointer(skb), fmr, false);
++
++				if (!ipv6_addr_equal(&ipv6h->saddr, &expected)) {
++					rcu_read_unlock();
++					goto discard;
++				}
++		}
+ 
+ 		__skb_tunnel_rx(skb, t->dev, t->net);
+ 
+@@ -1072,6 +1208,7 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
+ 	__u8 dsfield;
+ 	__u32 mtu;
+ 	int err;
++	struct __ip6_tnl_fmr *fmr;
+ 
+ 	if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
+ 	    !ip6_tnl_xmit_ctl(t))
+@@ -1091,6 +1228,18 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
+ 	if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
+ 		fl6.flowi6_mark = skb->mark;
+ 
++	/* try to find matching FMR */
++	for (fmr = t->parms.fmrs; fmr; fmr = fmr->next) {
++		unsigned mshift = 32 - fmr->ip4_prefix_len;
++		if (ntohl(fmr->ip4_prefix.s_addr) >> mshift ==
++				ntohl(iph->daddr) >> mshift)
++			break;
++	}
++
++	/* change dstaddr according to FMR */
++	if (fmr)
++		ip4ip6_fmr_calc(&fl6.daddr, iph, skb_tail_pointer(skb), fmr, true);
++
+ 	err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
+ 	if (err != 0) {
+ 		/* XXX: send ICMP error even if DF is not set. */
+@@ -1259,6 +1408,14 @@ ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
+ 	t->parms.flowinfo = p->flowinfo;
+ 	t->parms.link = p->link;
+ 	t->parms.proto = p->proto;
++
++	while (t->parms.fmrs) {
++		struct __ip6_tnl_fmr *next = t->parms.fmrs->next;
++		kfree(t->parms.fmrs);
++		t->parms.fmrs = next;
++	}
++	t->parms.fmrs = p->fmrs;
++
+ 	ip6_tnl_dst_reset(t);
+ 	ip6_tnl_link_config(t);
+ 	return 0;
+@@ -1289,6 +1446,7 @@ ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
+ 	p->flowinfo = u->flowinfo;
+ 	p->link = u->link;
+ 	p->proto = u->proto;
++	p->fmrs = NULL;
+ 	memcpy(p->name, u->name, sizeof(u->name));
+ }
+ 
+@@ -1569,6 +1727,15 @@ static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
+ 	return 0;
+ }
+ 
++static const struct nla_policy ip6_tnl_fmr_policy[IFLA_IPTUN_FMR_MAX + 1] = {
++	[IFLA_IPTUN_FMR_IP6_PREFIX] = { .len = sizeof(struct in6_addr) },
++	[IFLA_IPTUN_FMR_IP4_PREFIX] = { .len = sizeof(struct in_addr) },
++	[IFLA_IPTUN_FMR_IP6_PREFIX_LEN] = { .type = NLA_U8 },
++	[IFLA_IPTUN_FMR_IP4_PREFIX_LEN] = { .type = NLA_U8 },
++	[IFLA_IPTUN_FMR_EA_LEN] = { .type = NLA_U8 },
++	[IFLA_IPTUN_FMR_OFFSET] = { .type = NLA_U8 }
++};
++
+ static void ip6_tnl_netlink_parms(struct nlattr *data[],
+ 				  struct __ip6_tnl_parm *parms)
+ {
+@@ -1602,6 +1769,46 @@ static void ip6_tnl_netlink_parms(struct nlattr *data[],
+ 
+ 	if (data[IFLA_IPTUN_PROTO])
+ 		parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
++
++	if (data[IFLA_IPTUN_FMRS]) {
++		unsigned rem;
++		struct nlattr *fmr;
++		nla_for_each_nested(fmr, data[IFLA_IPTUN_FMRS], rem) {
++			struct nlattr *fmrd[IFLA_IPTUN_FMR_MAX + 1], *c;
++			struct __ip6_tnl_fmr *nfmr;
++
++			nla_parse_nested(fmrd, IFLA_IPTUN_FMR_MAX,
++				fmr, ip6_tnl_fmr_policy);
++
++			if (!(nfmr = kzalloc(sizeof(*nfmr), GFP_KERNEL)))
++				continue;
++
++			nfmr->offset = 6;
++
++			if ((c = fmrd[IFLA_IPTUN_FMR_IP6_PREFIX]))
++				nla_memcpy(&nfmr->ip6_prefix, fmrd[IFLA_IPTUN_FMR_IP6_PREFIX],
++					sizeof(nfmr->ip6_prefix));
++
++			if ((c = fmrd[IFLA_IPTUN_FMR_IP4_PREFIX]))
++				nla_memcpy(&nfmr->ip4_prefix, fmrd[IFLA_IPTUN_FMR_IP4_PREFIX],
++					sizeof(nfmr->ip4_prefix));
++
++			if ((c = fmrd[IFLA_IPTUN_FMR_IP6_PREFIX_LEN]))
++				nfmr->ip6_prefix_len = nla_get_u8(c);
++
++			if ((c = fmrd[IFLA_IPTUN_FMR_IP4_PREFIX_LEN]))
++				nfmr->ip4_prefix_len = nla_get_u8(c);
++
++			if ((c = fmrd[IFLA_IPTUN_FMR_EA_LEN]))
++				nfmr->ea_len = nla_get_u8(c);
++
++			if ((c = fmrd[IFLA_IPTUN_FMR_OFFSET]))
++				nfmr->offset = nla_get_u8(c);
++
++			nfmr->next = parms->fmrs;
++			parms->fmrs = nfmr;
++		}
++	}
+ }
+ 
+ static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
+@@ -1654,6 +1861,12 @@ static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
+ 
+ static size_t ip6_tnl_get_size(const struct net_device *dev)
+ {
++	const struct ip6_tnl *t = netdev_priv(dev);
++	struct __ip6_tnl_fmr *c;
++	int fmrs = 0;
++	for (c = t->parms.fmrs; c; c = c->next)
++		++fmrs;
++
+ 	return
+ 		/* IFLA_IPTUN_LINK */
+ 		nla_total_size(4) +
+@@ -1671,6 +1884,24 @@ static size_t ip6_tnl_get_size(const struct net_device *dev)
+ 		nla_total_size(4) +
+ 		/* IFLA_IPTUN_PROTO */
+ 		nla_total_size(1) +
++		/* IFLA_IPTUN_FMRS */
++		nla_total_size(0) +
++		(
++			/* nest */
++			nla_total_size(0) +
++			/* IFLA_IPTUN_FMR_IP6_PREFIX */
++			nla_total_size(sizeof(struct in6_addr)) +
++			/* IFLA_IPTUN_FMR_IP4_PREFIX */
++			nla_total_size(sizeof(struct in_addr)) +
++			/* IFLA_IPTUN_FMR_EA_LEN */
++			nla_total_size(1) +
++			/* IFLA_IPTUN_FMR_IP6_PREFIX_LEN */
++			nla_total_size(1) +
++			/* IFLA_IPTUN_FMR_IP4_PREFIX_LEN */
++			nla_total_size(1) +
++			/* IFLA_IPTUN_FMR_OFFSET */
++			nla_total_size(1)
++		) * fmrs +
+ 		0;
+ }
+ 
+@@ -1678,6 +1909,9 @@ static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
+ {
+ 	struct ip6_tnl *tunnel = netdev_priv(dev);
+ 	struct __ip6_tnl_parm *parm = &tunnel->parms;
++	struct __ip6_tnl_fmr *c;
++	int fmrcnt = 0;
++	struct nlattr *fmrs;
+ 
+ 	if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
+ 	    nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
+@@ -1688,8 +1922,27 @@ static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
+ 	    nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
+ 	    nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
+ 	    nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
+-	    nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
++	    nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
++	    !(fmrs = nla_nest_start(skb, IFLA_IPTUN_FMRS)))
+ 		goto nla_put_failure;
++
++	for (c = parm->fmrs; c; c = c->next) {
++		struct nlattr *fmr = nla_nest_start(skb, ++fmrcnt);
++		if (!fmr ||
++			nla_put(skb, IFLA_IPTUN_FMR_IP6_PREFIX,
++				sizeof(c->ip6_prefix), &c->ip6_prefix) ||
++			nla_put(skb, IFLA_IPTUN_FMR_IP4_PREFIX,
++				sizeof(c->ip4_prefix), &c->ip4_prefix) ||
++			nla_put_u8(skb, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, c->ip6_prefix_len) ||
++			nla_put_u8(skb, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, c->ip4_prefix_len) ||
++			nla_put_u8(skb, IFLA_IPTUN_FMR_EA_LEN, c->ea_len) ||
++			nla_put_u8(skb, IFLA_IPTUN_FMR_OFFSET, c->offset))
++				goto nla_put_failure;
++
++		nla_nest_end(skb, fmr);
++	}
++	nla_nest_end(skb, fmrs);
++
+ 	return 0;
+ 
+ nla_put_failure:
+@@ -1705,6 +1958,7 @@ static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
+ 	[IFLA_IPTUN_FLOWINFO]		= { .type = NLA_U32 },
+ 	[IFLA_IPTUN_FLAGS]		= { .type = NLA_U32 },
+ 	[IFLA_IPTUN_PROTO]		= { .type = NLA_U8 },
++	[IFLA_IPTUN_FMRS]		= { .type = NLA_NESTED },
+ };
+ 
+ static struct rtnl_link_ops ip6_link_ops __read_mostly = {
+-- 
+1.9.1
+