zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/ipv6/ip6_tunnel.c b/ap/os/linux/linux-3.4.x/net/ipv6/ip6_tunnel.c
new file mode 100644
index 0000000..b876a2f
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/ipv6/ip6_tunnel.c
@@ -0,0 +1,1593 @@
+/*
+ * IPv6 tunneling device
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Ville Nuorvala <vnuorval@tcs.hut.fi>
+ * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
+ *
+ * Based on:
+ * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
+ *
+ * RFC 2473
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/sockios.h>
+#include <linux/icmp.h>
+#include <linux/if.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/if_tunnel.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/icmpv6.h>
+#include <linux/init.h>
+#include <linux/route.h>
+#include <linux/rtnetlink.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/slab.h>
+
+#include <asm/uaccess.h>
+#include <linux/atomic.h>
+
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/ip6_tunnel.h>
+#include <net/xfrm.h>
+#include <net/dsfield.h>
+#include <net/inet_ecn.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+MODULE_AUTHOR("Ville Nuorvala");
+MODULE_DESCRIPTION("IPv6 tunneling device");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_RTNL_LINK("ip6tnl");
+MODULE_ALIAS_NETDEV("ip6tnl0");
+
+#ifdef IP6_TNL_DEBUG
+#define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__)
+#else
+#define IP6_TNL_TRACE(x...) do {;} while(0)
+#endif
+
+#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
+#define IPV6_TCLASS_SHIFT 20
+
+#define HASH_SIZE 32
+
+#define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
+ (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
+ (HASH_SIZE - 1))
+
+static int ip6_tnl_dev_init(struct net_device *dev);
+static void ip6_tnl_dev_setup(struct net_device *dev);
+
+static int ip6_tnl_net_id __read_mostly;
+struct ip6_tnl_net {
+ /* the IPv6 tunnel fallback device */
+ struct net_device *fb_tnl_dev;
+ /* lists for storing tunnels in use */
+ struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
+ struct ip6_tnl __rcu *tnls_wc[1];
+ struct ip6_tnl __rcu **tnls[2];
+};
+
+/* often modified stats are per cpu, other are shared (netdev->stats) */
+struct pcpu_tstats {
+ unsigned long rx_packets;
+ unsigned long rx_bytes;
+ unsigned long tx_packets;
+ unsigned long tx_bytes;
+} __attribute__((aligned(4*sizeof(unsigned long))));
+
+static struct net_device_stats *ip6_get_stats(struct net_device *dev)
+{
+ struct pcpu_tstats sum = { 0 };
+ int i;
+
+ for_each_possible_cpu(i) {
+ const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
+
+ sum.rx_packets += tstats->rx_packets;
+ sum.rx_bytes += tstats->rx_bytes;
+ sum.tx_packets += tstats->tx_packets;
+ sum.tx_bytes += tstats->tx_bytes;
+ }
+ dev->stats.rx_packets = sum.rx_packets;
+ dev->stats.rx_bytes = sum.rx_bytes;
+ dev->stats.tx_packets = sum.tx_packets;
+ dev->stats.tx_bytes = sum.tx_bytes;
+ return &dev->stats;
+}
+
+/*
+ * 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 *dst = t->dst_cache;
+
+ if (dst && dst->obsolete &&
+ dst->ops->check(dst, t->dst_cookie) == NULL) {
+ t->dst_cache = NULL;
+ dst_release(dst);
+ return NULL;
+ }
+
+ return dst;
+}
+
+static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
+{
+ dst_release(t->dst_cache);
+ t->dst_cache = NULL;
+}
+
+static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
+{
+ struct rt6_info *rt = (struct rt6_info *) dst;
+ t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
+ dst_release(t->dst_cache);
+ t->dst_cache = dst;
+}
+
+/**
+ * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
+ * @remote: the address of the tunnel exit-point
+ * @local: the address of the tunnel entry-point
+ *
+ * Return:
+ * tunnel matching given end-points if found,
+ * else fallback tunnel if its device is up,
+ * else %NULL
+ **/
+
+#define for_each_ip6_tunnel_rcu(start) \
+ for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
+
+static struct ip6_tnl *
+ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
+{
+ unsigned int h0 = HASH(remote);
+ unsigned int h1 = HASH(local);
+ struct ip6_tnl *t;
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) {
+ if (ipv6_addr_equal(local, &t->parms.laddr) &&
+ ipv6_addr_equal(remote, &t->parms.raddr) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+ t = rcu_dereference(ip6n->tnls_wc[0]);
+ if (t && (t->dev->flags & IFF_UP))
+ return t;
+
+ return NULL;
+}
+
+/**
+ * ip6_tnl_bucket - get head of list matching given tunnel parameters
+ * @p: parameters containing tunnel end-points
+ *
+ * Description:
+ * ip6_tnl_bucket() returns the head of the list matching the
+ * &struct in6_addr entries laddr and raddr in @p.
+ *
+ * Return: head of IPv6 tunnel list
+ **/
+
+static struct ip6_tnl __rcu **
+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 *local = &p->laddr;
+ unsigned h = 0;
+ int prio = 0;
+
+ if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
+ prio = 1;
+ h = HASH(remote) ^ HASH(local);
+ }
+ return &ip6n->tnls[prio][h];
+}
+
+/**
+ * ip6_tnl_link - add tunnel to hash table
+ * @t: tunnel to be added
+ **/
+
+static void
+ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
+{
+ struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
+
+ rcu_assign_pointer(t->next , rtnl_dereference(*tp));
+ rcu_assign_pointer(*tp, t);
+}
+
+/**
+ * ip6_tnl_unlink - remove tunnel from hash table
+ * @t: tunnel to be removed
+ **/
+
+static void
+ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
+{
+ struct ip6_tnl __rcu **tp;
+ struct ip6_tnl *iter;
+
+ for (tp = ip6_tnl_bucket(ip6n, &t->parms);
+ (iter = rtnl_dereference(*tp)) != NULL;
+ tp = &iter->next) {
+ if (t == iter) {
+ rcu_assign_pointer(*tp, t->next);
+ break;
+ }
+ }
+}
+
+static void ip6_dev_free(struct net_device *dev)
+{
+ free_percpu(dev->tstats);
+ free_netdev(dev);
+}
+
+/**
+ * ip6_tnl_create() - create a new tunnel
+ * @p: tunnel parameters
+ * @pt: pointer to new tunnel
+ *
+ * Description:
+ * Create tunnel matching given parameters.
+ *
+ * Return:
+ * created tunnel or NULL
+ **/
+
+static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
+{
+ struct net_device *dev;
+ struct ip6_tnl *t;
+ char name[IFNAMSIZ];
+ int err;
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ if (p->name[0])
+ strlcpy(name, p->name, IFNAMSIZ);
+ else
+ sprintf(name, "ip6tnl%%d");
+
+ dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
+ if (dev == NULL)
+ goto failed;
+
+ dev_net_set(dev, net);
+
+ t = netdev_priv(dev);
+ t->parms = *p;
+ err = ip6_tnl_dev_init(dev);
+ if (err < 0)
+ goto failed_free;
+
+ if ((err = register_netdevice(dev)) < 0)
+ goto failed_free;
+
+ strcpy(t->parms.name, dev->name);
+
+ dev_hold(dev);
+ ip6_tnl_link(ip6n, t);
+ return t;
+
+failed_free:
+ ip6_dev_free(dev);
+failed:
+ return NULL;
+}
+
+/**
+ * ip6_tnl_locate - find or create tunnel matching given parameters
+ * @p: tunnel parameters
+ * @create: != 0 if allowed to create new tunnel if no match found
+ *
+ * Description:
+ * ip6_tnl_locate() first tries to locate an existing tunnel
+ * based on @parms. If this is unsuccessful, but @create is set a new
+ * tunnel device is created and registered for use.
+ *
+ * Return:
+ * matching tunnel or NULL
+ **/
+
+static struct ip6_tnl *ip6_tnl_locate(struct net *net,
+ struct ip6_tnl_parm *p, int create)
+{
+ const struct in6_addr *remote = &p->raddr;
+ const struct in6_addr *local = &p->laddr;
+ struct ip6_tnl __rcu **tp;
+ struct ip6_tnl *t;
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ for (tp = ip6_tnl_bucket(ip6n, p);
+ (t = rtnl_dereference(*tp)) != NULL;
+ tp = &t->next) {
+ if (ipv6_addr_equal(local, &t->parms.laddr) &&
+ ipv6_addr_equal(remote, &t->parms.raddr))
+ return t;
+ }
+ if (!create)
+ return NULL;
+ return ip6_tnl_create(net, p);
+}
+
+/**
+ * ip6_tnl_dev_uninit - tunnel device uninitializer
+ * @dev: the device to be destroyed
+ *
+ * Description:
+ * ip6_tnl_dev_uninit() removes tunnel from its list
+ **/
+
+static void
+ip6_tnl_dev_uninit(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ if (dev == ip6n->fb_tnl_dev)
+ RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
+ else
+ ip6_tnl_unlink(ip6n, t);
+ ip6_tnl_dst_reset(t);
+ dev_put(dev);
+}
+
+/**
+ * parse_tvl_tnl_enc_lim - handle encapsulation limit option
+ * @skb: received socket buffer
+ *
+ * Return:
+ * 0 if none was found,
+ * else index to encapsulation limit
+ **/
+
+static __u16
+parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
+{
+ const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
+ __u8 nexthdr = ipv6h->nexthdr;
+ __u16 off = sizeof (*ipv6h);
+
+ while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
+ __u16 optlen = 0;
+ struct ipv6_opt_hdr *hdr;
+ if (raw + off + sizeof (*hdr) > skb->data &&
+ !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
+ break;
+
+ hdr = (struct ipv6_opt_hdr *) (raw + off);
+ if (nexthdr == NEXTHDR_FRAGMENT) {
+ struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
+ if (frag_hdr->frag_off)
+ break;
+ optlen = 8;
+ } else if (nexthdr == NEXTHDR_AUTH) {
+ optlen = (hdr->hdrlen + 2) << 2;
+ } else {
+ optlen = ipv6_optlen(hdr);
+ }
+ if (nexthdr == NEXTHDR_DEST) {
+ __u16 i = off + 2;
+ while (1) {
+ struct ipv6_tlv_tnl_enc_lim *tel;
+
+ /* No more room for encapsulation limit */
+ if (i + sizeof (*tel) > off + optlen)
+ break;
+
+ tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
+ /* return index of option if found and valid */
+ if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
+ tel->length == 1)
+ return i;
+ /* else jump to next option */
+ if (tel->type)
+ i += tel->length + 2;
+ else
+ i++;
+ }
+ }
+ nexthdr = hdr->nexthdr;
+ off += optlen;
+ }
+ return 0;
+}
+
+/**
+ * ip6_tnl_err - tunnel error handler
+ *
+ * Description:
+ * ip6_tnl_err() should handle errors in the tunnel according
+ * to the specifications in RFC 2473.
+ **/
+
+static int
+ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
+ u8 *type, u8 *code, int *msg, __u32 *info, int offset)
+{
+ const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
+ struct ip6_tnl *t;
+ int rel_msg = 0;
+ u8 rel_type = ICMPV6_DEST_UNREACH;
+ u8 rel_code = ICMPV6_ADDR_UNREACH;
+ __u32 rel_info = 0;
+ __u16 len;
+ int err = -ENOENT;
+
+ /* If the packet doesn't contain the original IPv6 header we are
+ in trouble since we might need the source address for further
+ processing of the error. */
+
+ rcu_read_lock();
+ if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
+ &ipv6h->saddr)) == NULL)
+ goto out;
+
+ if (t->parms.proto != ipproto && t->parms.proto != 0)
+ goto out;
+
+ err = 0;
+
+ switch (*type) {
+ __u32 teli;
+ struct ipv6_tlv_tnl_enc_lim *tel;
+ __u32 mtu;
+ case ICMPV6_DEST_UNREACH:
+ if (net_ratelimit())
+ printk(KERN_WARNING
+ "%s: Path to destination invalid "
+ "or inactive!\n", t->parms.name);
+ rel_msg = 1;
+ break;
+ case ICMPV6_TIME_EXCEED:
+ if ((*code) == ICMPV6_EXC_HOPLIMIT) {
+ if (net_ratelimit())
+ printk(KERN_WARNING
+ "%s: Too small hop limit or "
+ "routing loop in tunnel!\n",
+ t->parms.name);
+ rel_msg = 1;
+ }
+ break;
+ case ICMPV6_PARAMPROB:
+ teli = 0;
+ if ((*code) == ICMPV6_HDR_FIELD)
+ teli = parse_tlv_tnl_enc_lim(skb, skb->data);
+
+ if (teli && teli == *info - 2) {
+ tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
+ if (tel->encap_limit == 0) {
+ if (net_ratelimit())
+ printk(KERN_WARNING
+ "%s: Too small encapsulation "
+ "limit or routing loop in "
+ "tunnel!\n", t->parms.name);
+ rel_msg = 1;
+ }
+ } else if (net_ratelimit()) {
+ printk(KERN_WARNING
+ "%s: Recipient unable to parse tunneled "
+ "packet!\n ", t->parms.name);
+ }
+ break;
+ case ICMPV6_PKT_TOOBIG:
+ mtu = *info - offset;
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+ t->dev->mtu = mtu;
+
+ if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
+ rel_type = ICMPV6_PKT_TOOBIG;
+ rel_code = 0;
+ rel_info = mtu;
+ rel_msg = 1;
+ }
+ break;
+ }
+
+ *type = rel_type;
+ *code = rel_code;
+ *info = rel_info;
+ *msg = rel_msg;
+
+out:
+ rcu_read_unlock();
+ return err;
+}
+
+static int
+ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ int rel_msg = 0;
+ u8 rel_type = type;
+ u8 rel_code = code;
+ __u32 rel_info = ntohl(info);
+ int err;
+ struct sk_buff *skb2;
+ const struct iphdr *eiph;
+ struct rtable *rt;
+ struct flowi4 fl4;
+
+ err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
+ &rel_msg, &rel_info, offset);
+ if (err < 0)
+ return err;
+
+ if (rel_msg == 0)
+ return 0;
+
+ switch (rel_type) {
+ case ICMPV6_DEST_UNREACH:
+ if (rel_code != ICMPV6_ADDR_UNREACH)
+ return 0;
+ rel_type = ICMP_DEST_UNREACH;
+ rel_code = ICMP_HOST_UNREACH;
+ break;
+ case ICMPV6_PKT_TOOBIG:
+ if (rel_code != 0)
+ return 0;
+ rel_type = ICMP_DEST_UNREACH;
+ rel_code = ICMP_FRAG_NEEDED;
+ break;
+ default:
+ return 0;
+ }
+
+ if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
+ return 0;
+
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (!skb2)
+ return 0;
+
+ skb_dst_drop(skb2);
+
+ skb_pull(skb2, offset);
+ skb_reset_network_header(skb2);
+ eiph = ip_hdr(skb2);
+
+ /* Try to guess incoming interface */
+ rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
+ eiph->saddr, 0,
+ 0, 0,
+ IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
+ if (IS_ERR(rt))
+ goto out;
+
+ skb2->dev = rt->dst.dev;
+
+ /* route "incoming" packet */
+ if (rt->rt_flags & RTCF_LOCAL) {
+ ip_rt_put(rt);
+ rt = NULL;
+ rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
+ eiph->daddr, eiph->saddr,
+ 0, 0,
+ IPPROTO_IPIP,
+ RT_TOS(eiph->tos), 0);
+ if (IS_ERR(rt) ||
+ rt->dst.dev->type != ARPHRD_TUNNEL) {
+ if (!IS_ERR(rt))
+ ip_rt_put(rt);
+ goto out;
+ }
+ skb_dst_set(skb2, &rt->dst);
+ } else {
+ ip_rt_put(rt);
+ if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
+ skb2->dev) ||
+ skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
+ goto out;
+ }
+
+ /* change mtu on this route */
+ if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
+ if (rel_info > dst_mtu(skb_dst(skb2)))
+ goto out;
+
+ skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
+ }
+
+ icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
+
+out:
+ kfree_skb(skb2);
+ return 0;
+}
+
+static int
+ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ int rel_msg = 0;
+ u8 rel_type = type;
+ u8 rel_code = code;
+ __u32 rel_info = ntohl(info);
+ int err;
+
+ err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
+ &rel_msg, &rel_info, offset);
+ if (err < 0)
+ return err;
+
+ if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
+ struct rt6_info *rt;
+ struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+
+ if (!skb2)
+ return 0;
+
+ skb_dst_drop(skb2);
+ skb_pull(skb2, offset);
+ skb_reset_network_header(skb2);
+
+ /* Try to guess incoming interface */
+ rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
+ NULL, 0, 0);
+
+ if (rt && rt->dst.dev)
+ skb2->dev = rt->dst.dev;
+
+ icmpv6_send(skb2, rel_type, rel_code, rel_info);
+
+ if (rt)
+ dst_release(&rt->dst);
+
+ kfree_skb(skb2);
+ }
+
+ return 0;
+}
+
+static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
+ const struct ipv6hdr *ipv6h,
+ struct sk_buff *skb)
+{
+ __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
+
+ if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
+ ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
+
+ if (INET_ECN_is_ce(dsfield))
+ IP_ECN_set_ce(ip_hdr(skb));
+}
+
+static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
+ const struct ipv6hdr *ipv6h,
+ struct sk_buff *skb)
+{
+ if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
+ ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
+
+ if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
+ IP6_ECN_set_ce(ipv6_hdr(skb));
+}
+
+/* called with rcu_read_lock() */
+static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
+{
+ struct ip6_tnl_parm *p = &t->parms;
+ int ret = 0;
+ struct net *net = dev_net(t->dev);
+
+ if (p->flags & IP6_TNL_F_CAP_RCV) {
+ struct net_device *ldev = NULL;
+
+ if (p->link)
+ ldev = dev_get_by_index_rcu(net, p->link);
+
+ if ((ipv6_addr_is_multicast(&p->laddr) ||
+ likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
+ likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
+ ret = 1;
+
+ }
+ return ret;
+}
+
+/**
+ * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
+ * @skb: received socket buffer
+ * @protocol: ethernet protocol ID
+ * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
+ *
+ * Return: 0
+ **/
+
+static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
+ __u8 ipproto,
+ void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
+ const struct ipv6hdr *ipv6h,
+ struct sk_buff *skb))
+{
+ struct ip6_tnl *t;
+ const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+
+ rcu_read_lock();
+
+ if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
+ &ipv6h->daddr)) != NULL) {
+ struct pcpu_tstats *tstats;
+
+ if (t->parms.proto != ipproto && t->parms.proto != 0) {
+ rcu_read_unlock();
+ goto discard;
+ }
+
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
+ rcu_read_unlock();
+ goto discard;
+ }
+
+ if (!ip6_tnl_rcv_ctl(t)) {
+ t->dev->stats.rx_dropped++;
+ rcu_read_unlock();
+ goto discard;
+ }
+ secpath_reset(skb);
+ skb->mac_header = skb->network_header;
+ skb_reset_network_header(skb);
+ skb->protocol = htons(protocol);
+ skb->pkt_type = PACKET_HOST;
+ memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
+
+ tstats = this_cpu_ptr(t->dev->tstats);
+ tstats->rx_packets++;
+ tstats->rx_bytes += skb->len;
+
+ __skb_tunnel_rx(skb, t->dev);
+
+ dscp_ecn_decapsulate(t, ipv6h, skb);
+
+ netif_rx(skb);
+
+ rcu_read_unlock();
+ return 0;
+ }
+ rcu_read_unlock();
+ return 1;
+
+discard:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int ip4ip6_rcv(struct sk_buff *skb)
+{
+ return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
+ ip4ip6_dscp_ecn_decapsulate);
+}
+
+static int ip6ip6_rcv(struct sk_buff *skb)
+{
+ return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
+ ip6ip6_dscp_ecn_decapsulate);
+}
+
+struct ipv6_tel_txoption {
+ struct ipv6_txoptions ops;
+ __u8 dst_opt[8];
+};
+
+static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
+{
+ memset(opt, 0, sizeof(struct ipv6_tel_txoption));
+
+ opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
+ opt->dst_opt[3] = 1;
+ opt->dst_opt[4] = encap_limit;
+ opt->dst_opt[5] = IPV6_TLV_PADN;
+ opt->dst_opt[6] = 1;
+
+ opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
+ opt->ops.opt_nflen = 8;
+}
+
+/**
+ * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
+ * @t: the outgoing tunnel device
+ * @hdr: IPv6 header from the incoming packet
+ *
+ * Description:
+ * Avoid trivial tunneling loop by checking that tunnel exit-point
+ * doesn't match source of incoming packet.
+ *
+ * Return:
+ * 1 if conflict,
+ * 0 else
+ **/
+
+static inline int
+ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
+{
+ return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
+}
+
+static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
+{
+ struct ip6_tnl_parm *p = &t->parms;
+ int ret = 0;
+ struct net *net = dev_net(t->dev);
+
+ if (p->flags & IP6_TNL_F_CAP_XMIT) {
+ struct net_device *ldev = NULL;
+
+ rcu_read_lock();
+ if (p->link)
+ ldev = dev_get_by_index_rcu(net, p->link);
+
+ if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
+ printk(KERN_WARNING
+ "%s xmit: Local address not yet configured!\n",
+ p->name);
+ else if (!ipv6_addr_is_multicast(&p->raddr) &&
+ unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
+ printk(KERN_WARNING
+ "%s xmit: Routing loop! "
+ "Remote address found on this node!\n",
+ p->name);
+ else
+ ret = 1;
+ rcu_read_unlock();
+ }
+ return ret;
+}
+/**
+ * ip6_tnl_xmit2 - encapsulate packet and send
+ * @skb: the outgoing socket buffer
+ * @dev: the outgoing tunnel device
+ * @dsfield: dscp code for outer header
+ * @fl: flow of tunneled packet
+ * @encap_limit: encapsulation limit
+ * @pmtu: Path MTU is stored if packet is too big
+ *
+ * Description:
+ * Build new header and do some sanity checks on the packet before sending
+ * it.
+ *
+ * Return:
+ * 0 on success
+ * -1 fail
+ * %-EMSGSIZE message too big. return mtu in this case.
+ **/
+
+static int ip6_tnl_xmit2(struct sk_buff *skb,
+ struct net_device *dev,
+ __u8 dsfield,
+ struct flowi6 *fl6,
+ int encap_limit,
+ __u32 *pmtu)
+{
+ struct net *net = dev_net(dev);
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net_device_stats *stats = &t->dev->stats;
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ struct ipv6_tel_txoption opt;
+ struct dst_entry *dst = NULL, *ndst = NULL;
+ struct net_device *tdev;
+ int mtu;
+ unsigned int max_headroom = sizeof(struct ipv6hdr);
+ u8 proto;
+ int err = -1;
+ int pkt_len;
+
+ if (!fl6->flowi6_mark)
+ dst = ip6_tnl_dst_check(t);
+ if (!dst) {
+ ndst = ip6_route_output(net, NULL, fl6);
+
+ if (ndst->error)
+ goto tx_err_link_failure;
+ ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
+ if (IS_ERR(ndst)) {
+ err = PTR_ERR(ndst);
+ ndst = NULL;
+ goto tx_err_link_failure;
+ }
+ dst = ndst;
+ }
+
+ tdev = dst->dev;
+
+ if (tdev == dev) {
+ stats->collisions++;
+ if (net_ratelimit())
+ printk(KERN_WARNING
+ "%s: Local routing loop detected!\n",
+ t->parms.name);
+ goto tx_err_dst_release;
+ }
+ mtu = dst_mtu(dst) - sizeof (*ipv6h);
+ if (encap_limit >= 0) {
+ max_headroom += 8;
+ mtu -= 8;
+ }
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+ if (skb_dst(skb))
+ skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
+ if (skb->len > mtu) {
+ *pmtu = mtu;
+ err = -EMSGSIZE;
+ goto tx_err_dst_release;
+ }
+
+ /*
+ * Okay, now see if we can stuff it in the buffer as-is.
+ */
+ max_headroom += LL_RESERVED_SPACE(tdev);
+
+ if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
+ (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
+ struct sk_buff *new_skb;
+
+ if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
+ goto tx_err_dst_release;
+
+ if (skb->sk)
+ skb_set_owner_w(new_skb, skb->sk);
+ kfree_skb(skb);
+ skb = new_skb;
+ }
+ skb_dst_drop(skb);
+ if (fl6->flowi6_mark) {
+ skb_dst_set(skb, dst);
+ ndst = NULL;
+ } else {
+ skb_dst_set_noref(skb, dst);
+ }
+ skb->transport_header = skb->network_header;
+
+ proto = fl6->flowi6_proto;
+ if (encap_limit >= 0) {
+ init_tel_txopt(&opt, encap_limit);
+ ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
+ }
+ skb_push(skb, sizeof(struct ipv6hdr));
+ skb_reset_network_header(skb);
+ ipv6h = ipv6_hdr(skb);
+ *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000);
+ dsfield = INET_ECN_encapsulate(0, dsfield);
+ ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
+ ipv6h->hop_limit = t->parms.hop_limit;
+ ipv6h->nexthdr = proto;
+ ipv6h->saddr = fl6->saddr;
+ ipv6h->daddr = fl6->daddr;
+ nf_reset(skb);
+ pkt_len = skb->len;
+ err = ip6_local_out(skb);
+
+ if (net_xmit_eval(err) == 0) {
+ struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats);
+
+ tstats->tx_bytes += pkt_len;
+ tstats->tx_packets++;
+ } else {
+ stats->tx_errors++;
+ stats->tx_aborted_errors++;
+ }
+ if (ndst)
+ ip6_tnl_dst_store(t, ndst);
+ return 0;
+tx_err_link_failure:
+ stats->tx_carrier_errors++;
+ dst_link_failure(skb);
+tx_err_dst_release:
+ dst_release(ndst);
+ return err;
+}
+
+static inline int
+ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ const struct iphdr *iph = ip_hdr(skb);
+ int encap_limit = -1;
+ struct flowi6 fl6;
+ __u8 dsfield;
+ __u32 mtu;
+ int err;
+
+ if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
+ !ip6_tnl_xmit_ctl(t))
+ return -1;
+
+ if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ encap_limit = t->parms.encap_limit;
+
+ memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
+ fl6.flowi6_proto = IPPROTO_IPIP;
+
+ dsfield = ipv4_get_dsfield(iph);
+
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
+ fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
+ & IPV6_TCLASS_MASK;
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
+ fl6.flowi6_mark = skb->mark;
+
+ err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
+ if (err != 0) {
+ /* XXX: send ICMP error even if DF is not set. */
+ if (err == -EMSGSIZE)
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ htonl(mtu));
+ return -1;
+ }
+
+ return 0;
+}
+
+static inline int
+ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ int encap_limit = -1;
+ __u16 offset;
+ struct flowi6 fl6;
+ __u8 dsfield;
+ __u32 mtu;
+ int err;
+
+ if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
+ !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
+ return -1;
+
+ offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
+ if (offset > 0) {
+ struct ipv6_tlv_tnl_enc_lim *tel;
+ tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
+ if (tel->encap_limit == 0) {
+ icmpv6_send(skb, ICMPV6_PARAMPROB,
+ ICMPV6_HDR_FIELD, offset + 2);
+ return -1;
+ }
+ encap_limit = tel->encap_limit - 1;
+ } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ encap_limit = t->parms.encap_limit;
+
+ memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
+ fl6.flowi6_proto = IPPROTO_IPV6;
+
+ dsfield = ipv6_get_dsfield(ipv6h);
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
+ fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
+ fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
+ if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
+ fl6.flowi6_mark = skb->mark;
+
+ err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
+ if (err != 0) {
+ if (err == -EMSGSIZE)
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ return -1;
+ }
+
+ return 0;
+}
+
+static netdev_tx_t
+ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net_device_stats *stats = &t->dev->stats;
+ int ret;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ ret = ip4ip6_tnl_xmit(skb, dev);
+ break;
+ case htons(ETH_P_IPV6):
+ ret = ip6ip6_tnl_xmit(skb, dev);
+ break;
+ default:
+ goto tx_err;
+ }
+
+ if (ret < 0)
+ goto tx_err;
+
+ return NETDEV_TX_OK;
+
+tx_err:
+ stats->tx_errors++;
+ stats->tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static void ip6_tnl_set_cap(struct ip6_tnl *t)
+{
+ struct ip6_tnl_parm *p = &t->parms;
+ int ltype = ipv6_addr_type(&p->laddr);
+ int rtype = ipv6_addr_type(&p->raddr);
+
+ p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
+
+ if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
+ rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
+ !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
+ (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
+ if (ltype&IPV6_ADDR_UNICAST)
+ p->flags |= IP6_TNL_F_CAP_XMIT;
+ if (rtype&IPV6_ADDR_UNICAST)
+ p->flags |= IP6_TNL_F_CAP_RCV;
+ }
+}
+
+static void ip6_tnl_link_config(struct ip6_tnl *t)
+{
+ struct net_device *dev = t->dev;
+ struct ip6_tnl_parm *p = &t->parms;
+ struct flowi6 *fl6 = &t->fl.u.ip6;
+
+ memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
+ memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
+
+ /* Set up flowi template */
+ fl6->saddr = p->laddr;
+ fl6->daddr = p->raddr;
+ fl6->flowi6_oif = p->link;
+ fl6->flowlabel = 0;
+
+ if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
+ fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
+ if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
+ fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
+
+ ip6_tnl_set_cap(t);
+
+ if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
+ dev->flags |= IFF_POINTOPOINT;
+ else
+ dev->flags &= ~IFF_POINTOPOINT;
+
+ dev->iflink = p->link;
+
+ if (p->flags & IP6_TNL_F_CAP_XMIT) {
+ int strict = (ipv6_addr_type(&p->raddr) &
+ (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
+
+ struct rt6_info *rt = rt6_lookup(dev_net(dev),
+ &p->raddr, &p->laddr,
+ p->link, strict);
+
+ if (rt == NULL)
+ return;
+
+ if (rt->dst.dev) {
+ dev->hard_header_len = rt->dst.dev->hard_header_len +
+ sizeof (struct ipv6hdr);
+
+ dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
+ if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ dev->mtu-=8;
+
+ if (dev->mtu < IPV6_MIN_MTU)
+ dev->mtu = IPV6_MIN_MTU;
+ }
+ dst_release(&rt->dst);
+ }
+}
+
+/**
+ * ip6_tnl_change - update the tunnel parameters
+ * @t: tunnel to be changed
+ * @p: tunnel configuration parameters
+ *
+ * Description:
+ * ip6_tnl_change() updates the tunnel parameters
+ **/
+
+static int
+ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
+{
+ t->parms.laddr = p->laddr;
+ t->parms.raddr = p->raddr;
+ t->parms.flags = p->flags;
+ t->parms.hop_limit = p->hop_limit;
+ t->parms.encap_limit = p->encap_limit;
+ t->parms.flowinfo = p->flowinfo;
+ t->parms.link = p->link;
+ t->parms.proto = p->proto;
+ ip6_tnl_dst_reset(t);
+ ip6_tnl_link_config(t);
+ return 0;
+}
+
+/**
+ * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
+ * @dev: virtual device associated with tunnel
+ * @ifr: parameters passed from userspace
+ * @cmd: command to be performed
+ *
+ * Description:
+ * ip6_tnl_ioctl() is used for managing IPv6 tunnels
+ * from userspace.
+ *
+ * The possible commands are the following:
+ * %SIOCGETTUNNEL: get tunnel parameters for device
+ * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
+ * %SIOCCHGTUNNEL: change tunnel parameters to those given
+ * %SIOCDELTUNNEL: delete tunnel
+ *
+ * The fallback device "ip6tnl0", created during module
+ * initialization, can be used for creating other tunnel devices.
+ *
+ * Return:
+ * 0 on success,
+ * %-EFAULT if unable to copy data to or from userspace,
+ * %-EPERM if current process hasn't %CAP_NET_ADMIN set
+ * %-EINVAL if passed tunnel parameters are invalid,
+ * %-EEXIST if changing a tunnel's parameters would cause a conflict
+ * %-ENODEV if attempting to change or delete a nonexisting device
+ **/
+
+static int
+ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ int err = 0;
+ struct ip6_tnl_parm p;
+ struct ip6_tnl *t = NULL;
+ struct net *net = dev_net(dev);
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+ if (dev == ip6n->fb_tnl_dev) {
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
+ err = -EFAULT;
+ break;
+ }
+ t = ip6_tnl_locate(net, &p, 0);
+ }
+ if (t == NULL)
+ t = netdev_priv(dev);
+ memcpy(&p, &t->parms, sizeof (p));
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
+ err = -EFAULT;
+ }
+ break;
+ case SIOCADDTUNNEL:
+ case SIOCCHGTUNNEL:
+ err = -EPERM;
+ if (!capable(CAP_NET_ADMIN))
+ break;
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
+ break;
+ err = -EINVAL;
+ if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
+ p.proto != 0)
+ break;
+ t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
+ if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
+ if (t != NULL) {
+ if (t->dev != dev) {
+ err = -EEXIST;
+ break;
+ }
+ } else
+ t = netdev_priv(dev);
+
+ ip6_tnl_unlink(ip6n, t);
+ synchronize_net();
+ err = ip6_tnl_change(t, &p);
+ ip6_tnl_link(ip6n, t);
+ netdev_state_change(dev);
+ }
+ if (t) {
+ err = 0;
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
+ err = -EFAULT;
+
+ } else
+ err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
+ break;
+ case SIOCDELTUNNEL:
+ err = -EPERM;
+ if (!capable(CAP_NET_ADMIN))
+ break;
+
+ if (dev == ip6n->fb_tnl_dev) {
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
+ break;
+ err = -ENOENT;
+ if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
+ break;
+ err = -EPERM;
+ if (t->dev == ip6n->fb_tnl_dev)
+ break;
+ dev = t->dev;
+ }
+ err = 0;
+ unregister_netdevice(dev);
+ break;
+ default:
+ err = -EINVAL;
+ }
+ return err;
+}
+
+/**
+ * ip6_tnl_change_mtu - change mtu manually for tunnel device
+ * @dev: virtual device associated with tunnel
+ * @new_mtu: the new mtu
+ *
+ * Return:
+ * 0 on success,
+ * %-EINVAL if mtu too small
+ **/
+
+static int
+ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
+{
+ if (new_mtu < IPV6_MIN_MTU) {
+ return -EINVAL;
+ }
+ dev->mtu = new_mtu;
+ return 0;
+}
+
+
+static const struct net_device_ops ip6_tnl_netdev_ops = {
+ .ndo_uninit = ip6_tnl_dev_uninit,
+ .ndo_start_xmit = ip6_tnl_xmit,
+ .ndo_do_ioctl = ip6_tnl_ioctl,
+ .ndo_change_mtu = ip6_tnl_change_mtu,
+ .ndo_get_stats = ip6_get_stats,
+};
+
+
+/**
+ * ip6_tnl_dev_setup - setup virtual tunnel device
+ * @dev: virtual device associated with tunnel
+ *
+ * Description:
+ * Initialize function pointers and device parameters
+ **/
+
+static void ip6_tnl_dev_setup(struct net_device *dev)
+{
+ struct ip6_tnl *t;
+
+ dev->netdev_ops = &ip6_tnl_netdev_ops;
+ dev->destructor = ip6_dev_free;
+
+ dev->type = ARPHRD_TUNNEL6;
+ dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
+ dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
+ t = netdev_priv(dev);
+ if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
+ dev->mtu-=8;
+ dev->flags |= IFF_NOARP;
+ dev->addr_len = sizeof(struct in6_addr);
+ dev->features |= NETIF_F_NETNS_LOCAL;
+ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
+}
+
+
+/**
+ * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
+ * @dev: virtual device associated with tunnel
+ **/
+
+static inline int
+ip6_tnl_dev_init_gen(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+
+ t->dev = dev;
+ dev->tstats = alloc_percpu(struct pcpu_tstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+ return 0;
+}
+
+/**
+ * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
+ * @dev: virtual device associated with tunnel
+ **/
+
+static int ip6_tnl_dev_init(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ int err = ip6_tnl_dev_init_gen(dev);
+
+ if (err)
+ return err;
+ ip6_tnl_link_config(t);
+ return 0;
+}
+
+/**
+ * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
+ * @dev: fallback device
+ *
+ * Return: 0
+ **/
+
+static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
+{
+ struct ip6_tnl *t = netdev_priv(dev);
+ struct net *net = dev_net(dev);
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ int err = ip6_tnl_dev_init_gen(dev);
+
+ if (err)
+ return err;
+
+ t->parms.proto = IPPROTO_IPV6;
+ dev_hold(dev);
+ rcu_assign_pointer(ip6n->tnls_wc[0], t);
+ return 0;
+}
+
+static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
+ .handler = ip4ip6_rcv,
+ .err_handler = ip4ip6_err,
+ .priority = 1,
+};
+
+static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
+ .handler = ip6ip6_rcv,
+ .err_handler = ip6ip6_err,
+ .priority = 1,
+};
+
+static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
+{
+ int h;
+ struct ip6_tnl *t;
+ LIST_HEAD(list);
+
+ for (h = 0; h < HASH_SIZE; h++) {
+ t = rtnl_dereference(ip6n->tnls_r_l[h]);
+ while (t != NULL) {
+ unregister_netdevice_queue(t->dev, &list);
+ t = rtnl_dereference(t->next);
+ }
+ }
+
+ t = rtnl_dereference(ip6n->tnls_wc[0]);
+ unregister_netdevice_queue(t->dev, &list);
+ unregister_netdevice_many(&list);
+}
+
+static int __net_init ip6_tnl_init_net(struct net *net)
+{
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+ struct ip6_tnl *t = NULL;
+ int err;
+
+ ip6n->tnls[0] = ip6n->tnls_wc;
+ ip6n->tnls[1] = ip6n->tnls_r_l;
+
+ err = -ENOMEM;
+ ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
+ ip6_tnl_dev_setup);
+
+ if (!ip6n->fb_tnl_dev)
+ goto err_alloc_dev;
+ dev_net_set(ip6n->fb_tnl_dev, net);
+
+ err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
+ if (err < 0)
+ goto err_register;
+
+ err = register_netdev(ip6n->fb_tnl_dev);
+ if (err < 0)
+ goto err_register;
+
+ t = netdev_priv(ip6n->fb_tnl_dev);
+
+ strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
+ return 0;
+
+err_register:
+ ip6_dev_free(ip6n->fb_tnl_dev);
+err_alloc_dev:
+ return err;
+}
+
+static void __net_exit ip6_tnl_exit_net(struct net *net)
+{
+ struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
+
+ rtnl_lock();
+ ip6_tnl_destroy_tunnels(ip6n);
+ rtnl_unlock();
+}
+
+static struct pernet_operations ip6_tnl_net_ops = {
+ .init = ip6_tnl_init_net,
+ .exit = ip6_tnl_exit_net,
+ .id = &ip6_tnl_net_id,
+ .size = sizeof(struct ip6_tnl_net),
+};
+
+/**
+ * ip6_tunnel_init - register protocol and reserve needed resources
+ *
+ * Return: 0 on success
+ **/
+
+static int __init ip6_tunnel_init(void)
+{
+ int err;
+
+ err = register_pernet_device(&ip6_tnl_net_ops);
+ if (err < 0)
+ goto out_pernet;
+
+ err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
+ if (err < 0) {
+ printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
+ goto out_ip4ip6;
+ }
+
+ err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
+ if (err < 0) {
+ printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
+ goto out_ip6ip6;
+ }
+
+ return 0;
+
+out_ip6ip6:
+ xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
+out_ip4ip6:
+ unregister_pernet_device(&ip6_tnl_net_ops);
+out_pernet:
+ return err;
+}
+
+/**
+ * ip6_tunnel_cleanup - free resources and unregister protocol
+ **/
+
+static void __exit ip6_tunnel_cleanup(void)
+{
+ if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
+ printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
+
+ if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
+ printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
+
+ unregister_pernet_device(&ip6_tnl_net_ops);
+}
+
+module_init(ip6_tunnel_init);
+module_exit(ip6_tunnel_cleanup);