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gre: Support GRE over IPv6

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GRE over IPv6 implementation.

Signed-off-by: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
xeb@mail.ru 2012-08-10 00:51:50 +00:00 • committed by David S. Miller
commit c12b395a46
9 changed files with 1933 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/linux/if_arp.h
View file

@ -92,6 +92,7 @@
#define ARPHRD_PHONET 820 /* PhoNet media type */ #define ARPHRD_PHONET 820 /* PhoNet media type */
#define ARPHRD_PHONET_PIPE 821 /* PhoNet pipe header */ #define ARPHRD_PHONET_PIPE 821 /* PhoNet pipe header */
#define ARPHRD_CAIF 822 /* CAIF media type */ #define ARPHRD_CAIF 822 /* CAIF media type */
#define ARPHRD_IP6GRE 823 /* GRE over IPv6 */
#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */ #define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */
#define ARPHRD_NONE 0xFFFE /* zero header length */ #define ARPHRD_NONE 0xFFFE /* zero header length */

3
include/linux/if_tunnel.h
View file

@ -75,6 +75,9 @@ enum {
IFLA_GRE_TTL, IFLA_GRE_TTL,
IFLA_GRE_TOS, IFLA_GRE_TOS,
IFLA_GRE_PMTUDISC, IFLA_GRE_PMTUDISC,
IFLA_GRE_ENCAP_LIMIT,
IFLA_GRE_FLOWINFO,
IFLA_GRE_FLAGS,
__IFLA_GRE_MAX, __IFLA_GRE_MAX,
}; };

17
include/linux/ip6_tunnel.h
View file

@ -31,4 +31,21 @@ struct ip6_tnl_parm {
struct in6_addr raddr; /* remote tunnel end-point address */ struct in6_addr raddr; /* remote tunnel end-point address */
}; };
struct ip6_tnl_parm2 {
char name[IFNAMSIZ]; /* name of tunnel device */
int link; /* ifindex of underlying L2 interface */
__u8 proto; /* tunnel protocol */
__u8 encap_limit; /* encapsulation limit for tunnel */
__u8 hop_limit; /* hop limit for tunnel */
__be32 flowinfo; /* traffic class and flowlabel for tunnel */
__u32 flags; /* tunnel flags */
struct in6_addr laddr; /* local tunnel end-point address */
struct in6_addr raddr; /* remote tunnel end-point address */
__be16 i_flags;
__be16 o_flags;
__be32 i_key;
__be32 o_key;
};
#endif #endif

41
include/net/ip6_tunnel.h
View file

@ -5,6 +5,8 @@
#include <linux/netdevice.h> #include <linux/netdevice.h>
#include <linux/ip6_tunnel.h> #include <linux/ip6_tunnel.h>
#define IP6TUNNEL_ERR_TIMEO (30*HZ)
/* capable of sending packets */ /* capable of sending packets */
#define IP6_TNL_F_CAP_XMIT 0x10000 #define IP6_TNL_F_CAP_XMIT 0x10000
/* capable of receiving packets */ /* capable of receiving packets */
@ -12,15 +14,40 @@
/* determine capability on a per-packet basis */ /* determine capability on a per-packet basis */
#define IP6_TNL_F_CAP_PER_PACKET 0x40000 #define IP6_TNL_F_CAP_PER_PACKET 0x40000
/* IPv6 tunnel */ struct __ip6_tnl_parm {
char name[IFNAMSIZ]; /* name of tunnel device */
int link; /* ifindex of underlying L2 interface */
__u8 proto; /* tunnel protocol */
__u8 encap_limit; /* encapsulation limit for tunnel */
__u8 hop_limit; /* hop limit for tunnel */
__be32 flowinfo; /* traffic class and flowlabel for tunnel */
__u32 flags; /* tunnel flags */
struct in6_addr laddr; /* local tunnel end-point address */
struct in6_addr raddr; /* remote tunnel end-point address */
__be16 i_flags;
__be16 o_flags;
__be32 i_key;
__be32 o_key;
};
/* IPv6 tunnel */
struct ip6_tnl { struct ip6_tnl {
struct ip6_tnl __rcu *next; /* next tunnel in list */ struct ip6_tnl __rcu *next; /* next tunnel in list */
struct net_device *dev; /* virtual device associated with tunnel */ struct net_device *dev; /* virtual device associated with tunnel */
struct ip6_tnl_parm parms; /* tunnel configuration parameters */ struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
struct flowi fl; /* flowi template for xmit */ struct flowi fl; /* flowi template for xmit */
struct dst_entry *dst_cache; /* cached dst */ struct dst_entry *dst_cache; /* cached dst */
u32 dst_cookie; u32 dst_cookie;
int err_count;
unsigned long err_time;
/* These fields used only by GRE */
__u32 i_seqno; /* The last seen seqno */
__u32 o_seqno; /* The last output seqno */
int hlen; /* Precalculated GRE header length */
int mlink;
}; };
/* Tunnel encapsulation limit destination sub-option */ /* Tunnel encapsulation limit destination sub-option */
@ -31,4 +58,14 @@ struct ipv6_tlv_tnl_enc_lim {
__u8 encap_limit; /* tunnel encapsulation limit */ __u8 encap_limit; /* tunnel encapsulation limit */
} __packed; } __packed;
struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t);
void ip6_tnl_dst_reset(struct ip6_tnl *t);
void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst);
int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
const struct in6_addr *raddr);
int ip6_tnl_xmit_ctl(struct ip6_tnl *t);
__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
const struct in6_addr *raddr);
#endif #endif

1
include/net/ipv6.h
View file

@ -34,6 +34,7 @@
#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
#define NEXTHDR_ROUTING 43 /* Routing header. */ #define NEXTHDR_ROUTING 43 /* Routing header. */
#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
#define NEXTHDR_GRE 47 /* GRE header. */
#define NEXTHDR_ESP 50 /* Encapsulating security payload. */ #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
#define NEXTHDR_AUTH 51 /* Authentication header. */ #define NEXTHDR_AUTH 51 /* Authentication header. */
#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */

16
net/ipv6/Kconfig
View file

@ -201,6 +201,22 @@ config IPV6_TUNNEL
If unsure, say N. If unsure, say N.
config IPV6_GRE
tristate "IPv6: GRE tunnel"
select IPV6_TUNNEL
---help---
Tunneling means encapsulating data of one protocol type within
another protocol and sending it over a channel that understands the
encapsulating protocol. This particular tunneling driver implements
GRE (Generic Routing Encapsulation) and at this time allows
encapsulating of IPv4 or IPv6 over existing IPv6 infrastructure.
This driver is useful if the other endpoint is a Cisco router: Cisco
likes GRE much better than the other Linux tunneling driver ("IP
tunneling" above). In addition, GRE allows multicast redistribution
through the tunnel.
Saying M here will produce a module called ip6_gre. If unsure, say N.
config IPV6_MULTIPLE_TABLES config IPV6_MULTIPLE_TABLES
bool "IPv6: Multiple Routing Tables" bool "IPv6: Multiple Routing Tables"
depends on EXPERIMENTAL depends on EXPERIMENTAL

1
net/ipv6/Makefile
View file

@ -36,6 +36,7 @@ obj-$(CONFIG_NETFILTER) += netfilter/
obj-$(CONFIG_IPV6_SIT) += sit.o obj-$(CONFIG_IPV6_SIT) += sit.o
obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o
obj-$(CONFIG_IPV6_GRE) += ip6_gre.o
obj-y += addrconf_core.o exthdrs_core.o obj-y += addrconf_core.o exthdrs_core.o

1790
net/ipv6/ip6_gre.c Normal file
View file

File diff suppressed because it is too large Load diff

89
net/ipv6/ip6_tunnel.c
View file

@ -126,7 +126,7 @@ static struct net_device_stats *ip6_get_stats(struct net_device *dev)
* Locking : hash tables are protected by RCU and RTNL * Locking : hash tables are protected by RCU and RTNL
*/ */
static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
{ {
struct dst_entry *dst = t->dst_cache; struct dst_entry *dst = t->dst_cache;
@ -139,20 +139,23 @@ static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
return dst; return dst;
} }
EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) void ip6_tnl_dst_reset(struct ip6_tnl *t)
{ {
dst_release(t->dst_cache); dst_release(t->dst_cache);
t->dst_cache = NULL; t->dst_cache = NULL;
} }
EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
{ {
struct rt6_info *rt = (struct rt6_info *) dst; struct rt6_info *rt = (struct rt6_info *) dst;
t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
dst_release(t->dst_cache); dst_release(t->dst_cache);
t->dst_cache = dst; t->dst_cache = dst;
} }
EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
/** /**
* ip6_tnl_lookup - fetch tunnel matching the end-point addresses * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
@ -200,7 +203,7 @@ ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_
**/ **/
static struct ip6_tnl __rcu ** static struct ip6_tnl __rcu **
ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct ip6_tnl_parm *p) ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
{ {
const struct in6_addr *remote = &p->raddr; const struct in6_addr *remote = &p->raddr;
const struct in6_addr *local = &p->laddr; const struct in6_addr *local = &p->laddr;
@ -267,7 +270,7 @@ static void ip6_dev_free(struct net_device *dev)
* created tunnel or NULL * created tunnel or NULL
**/ **/
static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
{ {
struct net_device *dev; struct net_device *dev;
struct ip6_tnl *t; struct ip6_tnl *t;
@ -322,7 +325,7 @@ failed:
**/ **/
static struct ip6_tnl *ip6_tnl_locate(struct net *net, static struct ip6_tnl *ip6_tnl_locate(struct net *net,
struct ip6_tnl_parm *p, int create) struct __ip6_tnl_parm *p, int create)
{ {
const struct in6_addr *remote = &p->raddr; const struct in6_addr *remote = &p->raddr;
const struct in6_addr *local = &p->laddr; const struct in6_addr *local = &p->laddr;
@ -374,8 +377,7 @@ ip6_tnl_dev_uninit(struct net_device *dev)
* else index to encapsulation limit * else index to encapsulation limit
**/ **/
static __u16 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
{ {
const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
__u8 nexthdr = ipv6h->nexthdr; __u8 nexthdr = ipv6h->nexthdr;
@ -425,6 +427,7 @@ parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
} }
return 0; return 0;
} }
EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
/** /**
* ip6_tnl_err - tunnel error handler * ip6_tnl_err - tunnel error handler
@ -480,7 +483,7 @@ ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
case ICMPV6_PARAMPROB: case ICMPV6_PARAMPROB:
teli = 0; teli = 0;
if ((*code) == ICMPV6_HDR_FIELD) if ((*code) == ICMPV6_HDR_FIELD)
teli = parse_tlv_tnl_enc_lim(skb, skb->data); teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
if (teli && teli == *info - 2) { if (teli && teli == *info - 2) {
tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
@ -693,11 +696,11 @@ static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
IP6_ECN_set_ce(ipv6_hdr(skb)); IP6_ECN_set_ce(ipv6_hdr(skb));
} }
static __u32 ip6_tnl_get_cap(struct ip6_tnl *t, __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
const struct in6_addr *laddr, const struct in6_addr *laddr,
const struct in6_addr *raddr) const struct in6_addr *raddr)
{ {
struct ip6_tnl_parm *p = &t->parms; struct __ip6_tnl_parm *p = &t->parms;
int ltype = ipv6_addr_type(laddr); int ltype = ipv6_addr_type(laddr);
int rtype = ipv6_addr_type(raddr); int rtype = ipv6_addr_type(raddr);
__u32 flags = 0; __u32 flags = 0;
@ -715,13 +718,14 @@ static __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
} }
return flags; return flags;
} }
EXPORT_SYMBOL(ip6_tnl_get_cap);
/* called with rcu_read_lock() */ /* called with rcu_read_lock() */
static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t, int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
const struct in6_addr *laddr, const struct in6_addr *laddr,
const struct in6_addr *raddr) const struct in6_addr *raddr)
{ {
struct ip6_tnl_parm *p = &t->parms; struct __ip6_tnl_parm *p = &t->parms;
int ret = 0; int ret = 0;
struct net *net = dev_net(t->dev); struct net *net = dev_net(t->dev);
@ -740,6 +744,7 @@ static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
} }
return ret; return ret;
} }
EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
/** /**
* ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
@ -859,9 +864,9 @@ ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
} }
static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
{ {
struct ip6_tnl_parm *p = &t->parms; struct __ip6_tnl_parm *p = &t->parms;
int ret = 0; int ret = 0;
struct net *net = dev_net(t->dev); struct net *net = dev_net(t->dev);
@ -885,6 +890,8 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
} }
return ret; return ret;
} }
EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
/** /**
* ip6_tnl_xmit2 - encapsulate packet and send * ip6_tnl_xmit2 - encapsulate packet and send
* @skb: the outgoing socket buffer * @skb: the outgoing socket buffer
@ -1085,7 +1092,7 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
!ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
return -1; return -1;
offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
if (offset > 0) { if (offset > 0) {
struct ipv6_tlv_tnl_enc_lim *tel; struct ipv6_tlv_tnl_enc_lim *tel;
tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
@ -1152,7 +1159,7 @@ tx_err:
static void ip6_tnl_link_config(struct ip6_tnl *t) static void ip6_tnl_link_config(struct ip6_tnl *t)
{ {
struct net_device *dev = t->dev; struct net_device *dev = t->dev;
struct ip6_tnl_parm *p = &t->parms; struct __ip6_tnl_parm *p = &t->parms;
struct flowi6 *fl6 = &t->fl.u.ip6; struct flowi6 *fl6 = &t->fl.u.ip6;
memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
@ -1215,7 +1222,7 @@ static void ip6_tnl_link_config(struct ip6_tnl *t)
**/ **/
static int static int
ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
{ {
t->parms.laddr = p->laddr; t->parms.laddr = p->laddr;
t->parms.raddr = p->raddr; t->parms.raddr = p->raddr;
@ -1230,6 +1237,34 @@ ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
return 0; return 0;
} }
static void
ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
{
p->laddr = u->laddr;
p->raddr = u->raddr;
p->flags = u->flags;
p->hop_limit = u->hop_limit;
p->encap_limit = u->encap_limit;
p->flowinfo = u->flowinfo;
p->link = u->link;
p->proto = u->proto;
memcpy(p->name, u->name, sizeof(u->name));
}
static void
ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
{
u->laddr = p->laddr;
u->raddr = p->raddr;
u->flags = p->flags;
u->hop_limit = p->hop_limit;
u->encap_limit = p->encap_limit;
u->flowinfo = p->flowinfo;
u->link = p->link;
u->proto = p->proto;
memcpy(u->name, p->name, sizeof(u->name));
}
/** /**
* ip6_tnl_ioctl - configure ipv6 tunnels from userspace * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
* @dev: virtual device associated with tunnel * @dev: virtual device associated with tunnel
@ -1263,6 +1298,7 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{ {
int err = 0; int err = 0;
struct ip6_tnl_parm p; struct ip6_tnl_parm p;
struct __ip6_tnl_parm p1;
struct ip6_tnl *t = NULL; struct ip6_tnl *t = NULL;
struct net *net = dev_net(dev); struct net *net = dev_net(dev);
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
@ -1274,11 +1310,12 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
err = -EFAULT; err = -EFAULT;
break; break;
} }
t = ip6_tnl_locate(net, &p, 0); ip6_tnl_parm_from_user(&p1, &p);
t = ip6_tnl_locate(net, &p1, 0);
} }
if (t == NULL) if (t == NULL)
t = netdev_priv(dev); t = netdev_priv(dev);
memcpy(&p, &t->parms, sizeof (p)); ip6_tnl_parm_to_user(&p, &t->parms);
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
err = -EFAULT; err = -EFAULT;
} }
@ -1295,7 +1332,8 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
p.proto != 0) p.proto != 0)
break; break;
t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); ip6_tnl_parm_from_user(&p1, &p);
t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
if (t != NULL) { if (t != NULL) {
if (t->dev != dev) { if (t->dev != dev) {
@ -1307,13 +1345,14 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
ip6_tnl_unlink(ip6n, t); ip6_tnl_unlink(ip6n, t);
synchronize_net(); synchronize_net();
err = ip6_tnl_change(t, &p); err = ip6_tnl_change(t, &p1);
ip6_tnl_link(ip6n, t); ip6_tnl_link(ip6n, t);
netdev_state_change(dev); netdev_state_change(dev);
} }
if (t) { if (t) {
err = 0; err = 0;
if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) ip6_tnl_parm_to_user(&p, &t->parms);
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
err = -EFAULT; err = -EFAULT;
} else } else
@ -1329,7 +1368,9 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
break; break;
err = -ENOENT; err = -ENOENT;
if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) ip6_tnl_parm_from_user(&p1, &p);
t = ip6_tnl_locate(net, &p1, 0);
if (t == NULL)
break; break;
err = -EPERM; err = -EPERM;
if (t->dev == ip6n->fb_tnl_dev) if (t->dev == ip6n->fb_tnl_dev)