1 files changed, 0 insertions, 481 deletions

diff --git a/target/linux/generic/patches-3.13/666-Add-support-for-MAP-E-FMRs-mesh-mode.patch b/target/linux/generic/patches-3.13/666-Add-support-for-MAP-E-FMRs-mesh-mode.patch
deleted file mode 100644
index ca91ca1..0000000
--- a/target/linux/generic/patches-3.13/666-Add-support-for-MAP-E-FMRs-mesh-mode.patch
+++ /dev/null
@@ -1,481 +0,0 @@
-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(-)
-
---- 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;
---- 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
- 
---- 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
-@@ -80,11 +82,9 @@ 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);
-@@ -182,15 +182,24 @@ 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))
-@@ -220,7 +229,7 @@ ip6_tnl_bucket(struct ip6_tnl_net *ip6n,
- 
- 	if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
- 		prio = 1;
--		h = HASH(remote, local);
-+		h = HASH(local);
- 	}
- 	return &ip6n->tnls[prio][h];
- }
-@@ -388,6 +397,12 @@ ip6_tnl_dev_uninit(struct net_device *de
- 	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
-@@ -771,6 +786,108 @@ 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
-@@ -815,6 +932,26 @@ static int ip6_tnl_rcv(struct sk_buff *s
- 		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);
- 
-@@ -1075,6 +1212,7 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, str
- 	__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))
-@@ -1094,6 +1232,18 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, str
- 	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. */
-@@ -1262,6 +1412,14 @@ ip6_tnl_change(struct ip6_tnl *t, const
- 	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;
-@@ -1292,6 +1450,7 @@ ip6_tnl_parm_from_user(struct __ip6_tnl_
- 	p->flowinfo = u->flowinfo;
- 	p->link = u->link;
- 	p->proto = u->proto;
-+	p->fmrs = NULL;
- 	memcpy(p->name, u->name, sizeof(u->name));
- }
- 
-@@ -1579,6 +1738,15 @@ static int ip6_tnl_validate(struct nlatt
- 	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)
- {
-@@ -1612,6 +1780,46 @@ static void ip6_tnl_netlink_parms(struct
- 
- 	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,
-@@ -1664,6 +1872,12 @@ static void ip6_tnl_dellink(struct net_d
- 
- 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) +
-@@ -1681,6 +1895,24 @@ static size_t ip6_tnl_get_size(const str
- 		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;
- }
- 
-@@ -1688,6 +1920,9 @@ static int ip6_tnl_fill_info(struct sk_b
- {
- 	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),
-@@ -1698,8 +1933,27 @@ static int ip6_tnl_fill_info(struct sk_b
- 	    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:
-@@ -1715,6 +1969,7 @@ static const struct nla_policy ip6_tnl_p
- 	[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 = {