[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/net/ipv6/sit.c b/ap/os/linux/linux-3.4.x/net/ipv6/sit.c
new file mode 100644
index 0000000..3f20ba4
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/ipv6/sit.c
@@ -0,0 +1,1307 @@
+/*
+ * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ *
+ * 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.
+ *
+ * Changes:
+ * Roger Venning <r.venning@telstra.com>: 6to4 support
+ * Nate Thompson <nate@thebog.net>: 6to4 support
+ * Fred Templin <fred.l.templin@boeing.com>: isatap support
+ */
+
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/icmp.h>
+#include <linux/slab.h>
+#include <asm/uaccess.h>
+#include <linux/init.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/if_ether.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/icmp.h>
+#include <net/ipip.h>
+#include <net/inet_ecn.h>
+#include <net/xfrm.h>
+#include <net/dsfield.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
+/*
+ This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
+
+ For comments look at net/ipv4/ip_gre.c --ANK
+ */
+
+#define HASH_SIZE 16
+#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
+
+static int ipip6_tunnel_init(struct net_device *dev);
+static void ipip6_tunnel_setup(struct net_device *dev);
+static void ipip6_dev_free(struct net_device *dev);
+
+static int sit_net_id __read_mostly;
+struct sit_net {
+ struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
+ struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
+ struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
+ struct ip_tunnel __rcu *tunnels_wc[1];
+ struct ip_tunnel __rcu **tunnels[4];
+
+ struct net_device *fb_tunnel_dev;
+};
+
+/*
+ * Locking : hash tables are protected by RCU and RTNL
+ */
+
+#define for_each_ip_tunnel_rcu(start) \
+ for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
+
+/* 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 *ipip6_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;
+}
+/*
+ * Must be invoked with rcu_read_lock
+ */
+static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
+ struct net_device *dev, __be32 remote, __be32 local)
+{
+ unsigned int h0 = HASH(remote);
+ unsigned int h1 = HASH(local);
+ struct ip_tunnel *t;
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+
+ for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) {
+ if (local == t->parms.iph.saddr &&
+ remote == t->parms.iph.daddr &&
+ (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+ for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) {
+ if (remote == t->parms.iph.daddr &&
+ (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+ for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) {
+ if (local == t->parms.iph.saddr &&
+ (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
+ (t->dev->flags & IFF_UP))
+ return t;
+ }
+ t = rcu_dereference(sitn->tunnels_wc[0]);
+ if ((t != NULL) && (t->dev->flags & IFF_UP))
+ return t;
+ return NULL;
+}
+
+static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
+ struct ip_tunnel_parm *parms)
+{
+ __be32 remote = parms->iph.daddr;
+ __be32 local = parms->iph.saddr;
+ unsigned int h = 0;
+ int prio = 0;
+
+ if (remote) {
+ prio |= 2;
+ h ^= HASH(remote);
+ }
+ if (local) {
+ prio |= 1;
+ h ^= HASH(local);
+ }
+ return &sitn->tunnels[prio][h];
+}
+
+static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
+ struct ip_tunnel *t)
+{
+ return __ipip6_bucket(sitn, &t->parms);
+}
+
+static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
+{
+ struct ip_tunnel __rcu **tp;
+ struct ip_tunnel *iter;
+
+ for (tp = ipip6_bucket(sitn, t);
+ (iter = rtnl_dereference(*tp)) != NULL;
+ tp = &iter->next) {
+ if (t == iter) {
+ rcu_assign_pointer(*tp, t->next);
+ break;
+ }
+ }
+}
+
+static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
+{
+ struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
+
+ rcu_assign_pointer(t->next, rtnl_dereference(*tp));
+ rcu_assign_pointer(*tp, t);
+}
+
+static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
+{
+#ifdef CONFIG_IPV6_SIT_6RD
+ struct ip_tunnel *t = netdev_priv(dev);
+
+ if (t->dev == sitn->fb_tunnel_dev) {
+ ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
+ t->ip6rd.relay_prefix = 0;
+ t->ip6rd.prefixlen = 16;
+ t->ip6rd.relay_prefixlen = 0;
+ } else {
+ struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
+ memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
+ }
+#endif
+}
+
+static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
+ struct ip_tunnel_parm *parms, int create)
+{
+ __be32 remote = parms->iph.daddr;
+ __be32 local = parms->iph.saddr;
+ struct ip_tunnel *t, *nt;
+ struct ip_tunnel __rcu **tp;
+ struct net_device *dev;
+ char name[IFNAMSIZ];
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+
+ for (tp = __ipip6_bucket(sitn, parms);
+ (t = rtnl_dereference(*tp)) != NULL;
+ tp = &t->next) {
+ if (local == t->parms.iph.saddr &&
+ remote == t->parms.iph.daddr &&
+ parms->link == t->parms.link) {
+ if (create)
+ return NULL;
+ else
+ return t;
+ }
+ }
+ if (!create)
+ goto failed;
+
+ if (parms->name[0])
+ strlcpy(name, parms->name, IFNAMSIZ);
+ else
+ strcpy(name, "sit%d");
+
+ dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
+ if (dev == NULL)
+ return NULL;
+
+ dev_net_set(dev, net);
+
+ nt = netdev_priv(dev);
+
+ nt->parms = *parms;
+ if (ipip6_tunnel_init(dev) < 0)
+ goto failed_free;
+ ipip6_tunnel_clone_6rd(dev, sitn);
+
+ if (parms->i_flags & SIT_ISATAP)
+ dev->priv_flags |= IFF_ISATAP;
+
+ if (register_netdevice(dev) < 0)
+ goto failed_free;
+
+ strcpy(nt->parms.name, dev->name);
+
+ dev_hold(dev);
+
+ ipip6_tunnel_link(sitn, nt);
+ return nt;
+
+failed_free:
+ ipip6_dev_free(dev);
+failed:
+ return NULL;
+}
+
+#define for_each_prl_rcu(start) \
+ for (prl = rcu_dereference(start); \
+ prl; \
+ prl = rcu_dereference(prl->next))
+
+static struct ip_tunnel_prl_entry *
+__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
+{
+ struct ip_tunnel_prl_entry *prl;
+
+ for_each_prl_rcu(t->prl)
+ if (prl->addr == addr)
+ break;
+ return prl;
+
+}
+
+static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
+ struct ip_tunnel_prl __user *a)
+{
+ struct ip_tunnel_prl kprl, *kp;
+ struct ip_tunnel_prl_entry *prl;
+ unsigned int cmax, c = 0, ca, len;
+ int ret = 0;
+
+ if (copy_from_user(&kprl, a, sizeof(kprl)))
+ return -EFAULT;
+ cmax = kprl.datalen / sizeof(kprl);
+ if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
+ cmax = 1;
+
+ /* For simple GET or for root users,
+ * we try harder to allocate.
+ */
+ kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
+ kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
+ NULL;
+
+ rcu_read_lock();
+
+ ca = t->prl_count < cmax ? t->prl_count : cmax;
+
+ if (!kp) {
+ /* We don't try hard to allocate much memory for
+ * non-root users.
+ * For root users, retry allocating enough memory for
+ * the answer.
+ */
+ kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
+ if (!kp) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ }
+
+ c = 0;
+ for_each_prl_rcu(t->prl) {
+ if (c >= cmax)
+ break;
+ if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
+ continue;
+ kp[c].addr = prl->addr;
+ kp[c].flags = prl->flags;
+ c++;
+ if (kprl.addr != htonl(INADDR_ANY))
+ break;
+ }
+out:
+ rcu_read_unlock();
+
+ len = sizeof(*kp) * c;
+ ret = 0;
+ if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
+ ret = -EFAULT;
+
+ kfree(kp);
+
+ return ret;
+}
+
+static int
+ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
+{
+ struct ip_tunnel_prl_entry *p;
+ int err = 0;
+
+ if (a->addr == htonl(INADDR_ANY))
+ return -EINVAL;
+
+ ASSERT_RTNL();
+
+ for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
+ if (p->addr == a->addr) {
+ if (chg) {
+ p->flags = a->flags;
+ goto out;
+ }
+ err = -EEXIST;
+ goto out;
+ }
+ }
+
+ if (chg) {
+ err = -ENXIO;
+ goto out;
+ }
+
+ p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
+ if (!p) {
+ err = -ENOBUFS;
+ goto out;
+ }
+
+ p->next = t->prl;
+ p->addr = a->addr;
+ p->flags = a->flags;
+ t->prl_count++;
+ rcu_assign_pointer(t->prl, p);
+out:
+ return err;
+}
+
+static void prl_list_destroy_rcu(struct rcu_head *head)
+{
+ struct ip_tunnel_prl_entry *p, *n;
+
+ p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
+ do {
+ n = rcu_dereference_protected(p->next, 1);
+ kfree(p);
+ p = n;
+ } while (p);
+}
+
+static int
+ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
+{
+ struct ip_tunnel_prl_entry *x;
+ struct ip_tunnel_prl_entry __rcu **p;
+ int err = 0;
+
+ ASSERT_RTNL();
+
+ if (a && a->addr != htonl(INADDR_ANY)) {
+ for (p = &t->prl;
+ (x = rtnl_dereference(*p)) != NULL;
+ p = &x->next) {
+ if (x->addr == a->addr) {
+ *p = x->next;
+ kfree_rcu(x, rcu_head);
+ t->prl_count--;
+ goto out;
+ }
+ }
+ err = -ENXIO;
+ } else {
+ x = rtnl_dereference(t->prl);
+ if (x) {
+ t->prl_count = 0;
+ call_rcu(&x->rcu_head, prl_list_destroy_rcu);
+ t->prl = NULL;
+ }
+ }
+out:
+ return err;
+}
+
+static int
+isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
+{
+ struct ip_tunnel_prl_entry *p;
+ int ok = 1;
+
+ rcu_read_lock();
+ p = __ipip6_tunnel_locate_prl(t, iph->saddr);
+ if (p) {
+ if (p->flags & PRL_DEFAULT)
+ skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
+ else
+ skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
+ } else {
+ const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
+
+ if (ipv6_addr_is_isatap(addr6) &&
+ (addr6->s6_addr32[3] == iph->saddr) &&
+ ipv6_chk_prefix(addr6, t->dev))
+ skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
+ else
+ ok = 0;
+ }
+ rcu_read_unlock();
+ return ok;
+}
+
+static void ipip6_tunnel_uninit(struct net_device *dev)
+{
+ struct net *net = dev_net(dev);
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+
+ if (dev == sitn->fb_tunnel_dev) {
+ RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
+ } else {
+ ipip6_tunnel_unlink(sitn, netdev_priv(dev));
+ ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
+ }
+ dev_put(dev);
+}
+
+
+static int ipip6_err(struct sk_buff *skb, u32 info)
+{
+
+/* All the routers (except for Linux) return only
+ 8 bytes of packet payload. It means, that precise relaying of
+ ICMP in the real Internet is absolutely infeasible.
+ */
+ const struct iphdr *iph = (const struct iphdr *)skb->data;
+ const int type = icmp_hdr(skb)->type;
+ const int code = icmp_hdr(skb)->code;
+ struct ip_tunnel *t;
+ int err;
+
+ switch (type) {
+ default:
+ case ICMP_PARAMETERPROB:
+ return 0;
+
+ case ICMP_DEST_UNREACH:
+ switch (code) {
+ case ICMP_SR_FAILED:
+ case ICMP_PORT_UNREACH:
+ /* Impossible event. */
+ return 0;
+ case ICMP_FRAG_NEEDED:
+ /* Soft state for pmtu is maintained by IP core. */
+ return 0;
+ default:
+ /* All others are translated to HOST_UNREACH.
+ rfc2003 contains "deep thoughts" about NET_UNREACH,
+ I believe they are just ether pollution. --ANK
+ */
+ break;
+ }
+ break;
+ case ICMP_TIME_EXCEEDED:
+ if (code != ICMP_EXC_TTL)
+ return 0;
+ break;
+ }
+
+ err = -ENOENT;
+
+ rcu_read_lock();
+ t = ipip6_tunnel_lookup(dev_net(skb->dev),
+ skb->dev,
+ iph->daddr,
+ iph->saddr);
+ if (t == NULL || t->parms.iph.daddr == 0)
+ goto out;
+
+ err = 0;
+ if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
+ goto out;
+
+ if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
+ t->err_count++;
+ else
+ t->err_count = 1;
+ t->err_time = jiffies;
+out:
+ rcu_read_unlock();
+ return err;
+}
+
+static inline void ipip6_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb)
+{
+ if (INET_ECN_is_ce(iph->tos))
+ IP6_ECN_set_ce(ipv6_hdr(skb));
+}
+
+static int ipip6_rcv(struct sk_buff *skb)
+{
+ const struct iphdr *iph;
+ struct ip_tunnel *tunnel;
+
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto out;
+
+ iph = ip_hdr(skb);
+
+ rcu_read_lock();
+ tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
+ iph->saddr, iph->daddr);
+ if (tunnel != NULL) {
+ struct pcpu_tstats *tstats;
+
+ secpath_reset(skb);
+ skb->mac_header = skb->network_header;
+ skb_reset_network_header(skb);
+ IPCB(skb)->flags = 0;
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->pkt_type = PACKET_HOST;
+
+ if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
+ !isatap_chksrc(skb, iph, tunnel)) {
+ tunnel->dev->stats.rx_errors++;
+ rcu_read_unlock();
+ kfree_skb(skb);
+ return 0;
+ }
+
+ tstats = this_cpu_ptr(tunnel->dev->tstats);
+ tstats->rx_packets++;
+ tstats->rx_bytes += skb->len;
+
+ __skb_tunnel_rx(skb, tunnel->dev);
+
+ ipip6_ecn_decapsulate(iph, skb);
+
+ netif_rx(skb);
+
+ rcu_read_unlock();
+ return 0;
+ }
+
+ /* no tunnel matched, let upstream know, ipsec may handle it */
+ rcu_read_unlock();
+ return 1;
+out:
+ kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * Returns the embedded IPv4 address if the IPv6 address
+ * comes from 6rd / 6to4 (RFC 3056) addr space.
+ */
+static inline
+__be32 try_6rd(const struct in6_addr *v6dst, struct ip_tunnel *tunnel)
+{
+ __be32 dst = 0;
+
+#ifdef CONFIG_IPV6_SIT_6RD
+ if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
+ tunnel->ip6rd.prefixlen)) {
+ unsigned int pbw0, pbi0;
+ int pbi1;
+ u32 d;
+
+ pbw0 = tunnel->ip6rd.prefixlen >> 5;
+ pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
+
+ d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
+ tunnel->ip6rd.relay_prefixlen;
+
+ pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
+ if (pbi1 > 0)
+ d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
+ (32 - pbi1);
+
+ dst = tunnel->ip6rd.relay_prefix | htonl(d);
+ }
+#else
+ if (v6dst->s6_addr16[0] == htons(0x2002)) {
+ /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
+ memcpy(&dst, &v6dst->s6_addr16[1], 4);
+ }
+#endif
+ return dst;
+}
+
+/*
+ * This function assumes it is being called from dev_queue_xmit()
+ * and that skb is filled properly by that function.
+ */
+
+static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct pcpu_tstats *tstats;
+ const struct iphdr *tiph = &tunnel->parms.iph;
+ const struct ipv6hdr *iph6 = ipv6_hdr(skb);
+ u8 tos = tunnel->parms.iph.tos;
+ __be16 df = tiph->frag_off;
+ struct rtable *rt; /* Route to the other host */
+ struct net_device *tdev; /* Device to other host */
+ struct iphdr *iph; /* Our new IP header */
+ unsigned int max_headroom; /* The extra header space needed */
+ __be32 dst = tiph->daddr;
+ struct flowi4 fl4;
+ int mtu;
+ const struct in6_addr *addr6;
+ int addr_type;
+
+ if (skb->protocol != htons(ETH_P_IPV6))
+ goto tx_error;
+
+ if (tos == 1)
+ tos = ipv6_get_dsfield(iph6);
+
+ /* ISATAP (RFC4214) - must come before 6to4 */
+ if (dev->priv_flags & IFF_ISATAP) {
+ struct neighbour *neigh = NULL;
+ bool do_tx_error = false;
+
+ if (skb_dst(skb))
+ neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
+
+ if (neigh == NULL) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "sit: nexthop == NULL\n");
+ goto tx_error;
+ }
+
+ addr6 = (const struct in6_addr*)&neigh->primary_key;
+ addr_type = ipv6_addr_type(addr6);
+
+ if ((addr_type & IPV6_ADDR_UNICAST) &&
+ ipv6_addr_is_isatap(addr6))
+ dst = addr6->s6_addr32[3];
+ else
+ do_tx_error = true;
+
+ neigh_release(neigh);
+ if (do_tx_error)
+ goto tx_error;
+ }
+
+ if (!dst)
+ dst = try_6rd(&iph6->daddr, tunnel);
+
+ if (!dst) {
+ struct neighbour *neigh = NULL;
+ bool do_tx_error = false;
+
+ if (skb_dst(skb))
+ neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
+
+ if (neigh == NULL) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "sit: nexthop == NULL\n");
+ goto tx_error;
+ }
+
+ addr6 = (const struct in6_addr*)&neigh->primary_key;
+ addr_type = ipv6_addr_type(addr6);
+
+ if (addr_type == IPV6_ADDR_ANY) {
+ addr6 = &ipv6_hdr(skb)->daddr;
+ addr_type = ipv6_addr_type(addr6);
+ }
+
+ if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
+ dst = addr6->s6_addr32[3];
+ else
+ do_tx_error = true;
+
+ neigh_release(neigh);
+ if (do_tx_error)
+ goto tx_error;
+ }
+
+ rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
+ dst, tiph->saddr,
+ 0, 0,
+ IPPROTO_IPV6, RT_TOS(tos),
+ tunnel->parms.link);
+ if (IS_ERR(rt)) {
+ dev->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+ if (rt->rt_type != RTN_UNICAST) {
+ ip_rt_put(rt);
+ dev->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+ tdev = rt->dst.dev;
+
+ if (tdev == dev) {
+ ip_rt_put(rt);
+ dev->stats.collisions++;
+ goto tx_error;
+ }
+
+ if (df) {
+ mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
+
+ if (mtu < 68) {
+ dev->stats.collisions++;
+ ip_rt_put(rt);
+ goto tx_error;
+ }
+
+ if (mtu < IPV6_MIN_MTU) {
+ mtu = IPV6_MIN_MTU;
+ df = 0;
+ }
+
+ if (tunnel->parms.iph.daddr && skb_dst(skb))
+ skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
+
+ if (skb->len > mtu) {
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ ip_rt_put(rt);
+ goto tx_error;
+ }
+ }
+
+ if (tunnel->err_count > 0) {
+ if (time_before(jiffies,
+ tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
+ tunnel->err_count--;
+ dst_link_failure(skb);
+ } else
+ tunnel->err_count = 0;
+ }
+
+ /*
+ * Okay, now see if we can stuff it in the buffer as-is.
+ */
+ max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
+
+ if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
+ (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
+ struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
+ if (!new_skb) {
+ ip_rt_put(rt);
+ dev->stats.tx_dropped++;
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ if (skb->sk)
+ skb_set_owner_w(new_skb, skb->sk);
+ dev_kfree_skb(skb);
+ skb = new_skb;
+ iph6 = ipv6_hdr(skb);
+ }
+
+ skb->transport_header = skb->network_header;
+ skb_push(skb, sizeof(struct iphdr));
+ skb_reset_network_header(skb);
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ IPCB(skb)->flags = 0;
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+
+ /*
+ * Push down and install the IPIP header.
+ */
+
+ iph = ip_hdr(skb);
+ iph->version = 4;
+ iph->ihl = sizeof(struct iphdr)>>2;
+ iph->frag_off = df;
+ iph->protocol = IPPROTO_IPV6;
+ iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
+ iph->daddr = fl4.daddr;
+ iph->saddr = fl4.saddr;
+
+ if ((iph->ttl = tiph->ttl) == 0)
+ iph->ttl = iph6->hop_limit;
+
+ nf_reset(skb);
+ tstats = this_cpu_ptr(dev->tstats);
+ __IPTUNNEL_XMIT(tstats, &dev->stats);
+ return NETDEV_TX_OK;
+
+tx_error_icmp:
+ dst_link_failure(skb);
+tx_error:
+ dev->stats.tx_errors++;
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static void ipip6_tunnel_bind_dev(struct net_device *dev)
+{
+ struct net_device *tdev = NULL;
+ struct ip_tunnel *tunnel;
+ const struct iphdr *iph;
+ struct flowi4 fl4;
+
+ tunnel = netdev_priv(dev);
+ iph = &tunnel->parms.iph;
+
+ if (iph->daddr) {
+ struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
+ iph->daddr, iph->saddr,
+ 0, 0,
+ IPPROTO_IPV6,
+ RT_TOS(iph->tos),
+ tunnel->parms.link);
+
+ if (!IS_ERR(rt)) {
+ tdev = rt->dst.dev;
+ ip_rt_put(rt);
+ }
+ dev->flags |= IFF_POINTOPOINT;
+ }
+
+ if (!tdev && tunnel->parms.link)
+ tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
+
+ if (tdev) {
+ dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
+ dev->mtu = tdev->mtu - sizeof(struct iphdr);
+ if (dev->mtu < IPV6_MIN_MTU)
+ dev->mtu = IPV6_MIN_MTU;
+ }
+ dev->iflink = tunnel->parms.link;
+}
+
+static int
+ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ int err = 0;
+ struct ip_tunnel_parm p;
+ struct ip_tunnel_prl prl;
+ struct ip_tunnel *t;
+ struct net *net = dev_net(dev);
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+#ifdef CONFIG_IPV6_SIT_6RD
+ struct ip_tunnel_6rd ip6rd;
+#endif
+
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+#ifdef CONFIG_IPV6_SIT_6RD
+ case SIOCGET6RD:
+#endif
+ t = NULL;
+ if (dev == sitn->fb_tunnel_dev) {
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
+ err = -EFAULT;
+ break;
+ }
+ t = ipip6_tunnel_locate(net, &p, 0);
+ }
+ if (t == NULL)
+ t = netdev_priv(dev);
+
+ err = -EFAULT;
+ if (cmd == SIOCGETTUNNEL) {
+ memcpy(&p, &t->parms, sizeof(p));
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
+ sizeof(p)))
+ goto done;
+#ifdef CONFIG_IPV6_SIT_6RD
+ } else {
+ ip6rd.prefix = t->ip6rd.prefix;
+ ip6rd.relay_prefix = t->ip6rd.relay_prefix;
+ ip6rd.prefixlen = t->ip6rd.prefixlen;
+ ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
+ sizeof(ip6rd)))
+ goto done;
+#endif
+ }
+ err = 0;
+ break;
+
+ case SIOCADDTUNNEL:
+ case SIOCCHGTUNNEL:
+ err = -EPERM;
+ if (!capable(CAP_NET_ADMIN))
+ goto done;
+
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ goto done;
+
+ err = -EINVAL;
+ if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
+ p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
+ goto done;
+ if (p.iph.ttl)
+ p.iph.frag_off |= htons(IP_DF);
+
+ t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
+
+ if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
+ if (t != NULL) {
+ if (t->dev != dev) {
+ err = -EEXIST;
+ break;
+ }
+ } else {
+ if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
+ (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
+ err = -EINVAL;
+ break;
+ }
+ t = netdev_priv(dev);
+ ipip6_tunnel_unlink(sitn, t);
+ synchronize_net();
+ t->parms.iph.saddr = p.iph.saddr;
+ t->parms.iph.daddr = p.iph.daddr;
+ memcpy(dev->dev_addr, &p.iph.saddr, 4);
+ memcpy(dev->broadcast, &p.iph.daddr, 4);
+ ipip6_tunnel_link(sitn, t);
+ netdev_state_change(dev);
+ }
+ }
+
+ if (t) {
+ err = 0;
+ if (cmd == SIOCCHGTUNNEL) {
+ t->parms.iph.ttl = p.iph.ttl;
+ t->parms.iph.tos = p.iph.tos;
+ if (t->parms.link != p.link) {
+ t->parms.link = p.link;
+ ipip6_tunnel_bind_dev(dev);
+ netdev_state_change(dev);
+ }
+ }
+ 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))
+ goto done;
+
+ if (dev == sitn->fb_tunnel_dev) {
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ goto done;
+ err = -ENOENT;
+ if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
+ goto done;
+ err = -EPERM;
+ if (t == netdev_priv(sitn->fb_tunnel_dev))
+ goto done;
+ dev = t->dev;
+ }
+ unregister_netdevice(dev);
+ err = 0;
+ break;
+
+ case SIOCGETPRL:
+ err = -EINVAL;
+ if (dev == sitn->fb_tunnel_dev)
+ goto done;
+ err = -ENOENT;
+ if (!(t = netdev_priv(dev)))
+ goto done;
+ err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
+ break;
+
+ case SIOCADDPRL:
+ case SIOCDELPRL:
+ case SIOCCHGPRL:
+ err = -EPERM;
+ if (!capable(CAP_NET_ADMIN))
+ goto done;
+ err = -EINVAL;
+ if (dev == sitn->fb_tunnel_dev)
+ goto done;
+ err = -EFAULT;
+ if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
+ goto done;
+ err = -ENOENT;
+ if (!(t = netdev_priv(dev)))
+ goto done;
+
+ switch (cmd) {
+ case SIOCDELPRL:
+ err = ipip6_tunnel_del_prl(t, &prl);
+ break;
+ case SIOCADDPRL:
+ case SIOCCHGPRL:
+ err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
+ break;
+ }
+ netdev_state_change(dev);
+ break;
+
+#ifdef CONFIG_IPV6_SIT_6RD
+ case SIOCADD6RD:
+ case SIOCCHG6RD:
+ case SIOCDEL6RD:
+ err = -EPERM;
+ if (!capable(CAP_NET_ADMIN))
+ goto done;
+
+ err = -EFAULT;
+ if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
+ sizeof(ip6rd)))
+ goto done;
+
+ t = netdev_priv(dev);
+
+ if (cmd != SIOCDEL6RD) {
+ struct in6_addr prefix;
+ __be32 relay_prefix;
+
+ err = -EINVAL;
+ if (ip6rd.relay_prefixlen > 32 ||
+ ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64)
+ goto done;
+
+ ipv6_addr_prefix(&prefix, &ip6rd.prefix,
+ ip6rd.prefixlen);
+ if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
+ goto done;
+ if (ip6rd.relay_prefixlen)
+ relay_prefix = ip6rd.relay_prefix &
+ htonl(0xffffffffUL <<
+ (32 - ip6rd.relay_prefixlen));
+ else
+ relay_prefix = 0;
+ if (relay_prefix != ip6rd.relay_prefix)
+ goto done;
+
+ t->ip6rd.prefix = prefix;
+ t->ip6rd.relay_prefix = relay_prefix;
+ t->ip6rd.prefixlen = ip6rd.prefixlen;
+ t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen;
+ } else
+ ipip6_tunnel_clone_6rd(dev, sitn);
+
+ err = 0;
+ break;
+#endif
+
+ default:
+ err = -EINVAL;
+ }
+
+done:
+ return err;
+}
+
+static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
+{
+ if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
+ return -EINVAL;
+ dev->mtu = new_mtu;
+ return 0;
+}
+
+static const struct net_device_ops ipip6_netdev_ops = {
+ .ndo_uninit = ipip6_tunnel_uninit,
+ .ndo_start_xmit = ipip6_tunnel_xmit,
+ .ndo_do_ioctl = ipip6_tunnel_ioctl,
+ .ndo_change_mtu = ipip6_tunnel_change_mtu,
+ .ndo_get_stats = ipip6_get_stats,
+};
+
+static void ipip6_dev_free(struct net_device *dev)
+{
+ free_percpu(dev->tstats);
+ free_netdev(dev);
+}
+
+static void ipip6_tunnel_setup(struct net_device *dev)
+{
+ dev->netdev_ops = &ipip6_netdev_ops;
+ dev->destructor = ipip6_dev_free;
+
+ dev->type = ARPHRD_SIT;
+ dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
+ dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
+ dev->flags = IFF_NOARP;
+ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
+ dev->iflink = 0;
+ dev->addr_len = 4;
+ dev->features |= NETIF_F_NETNS_LOCAL;
+ dev->features |= NETIF_F_LLTX;
+}
+
+static int ipip6_tunnel_init(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+
+ tunnel->dev = dev;
+
+ memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
+ memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
+
+ ipip6_tunnel_bind_dev(dev);
+ dev->tstats = alloc_percpu(struct pcpu_tstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct iphdr *iph = &tunnel->parms.iph;
+ struct net *net = dev_net(dev);
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+
+ tunnel->dev = dev;
+ strcpy(tunnel->parms.name, dev->name);
+
+ iph->version = 4;
+ iph->protocol = IPPROTO_IPV6;
+ iph->ihl = 5;
+ iph->ttl = 64;
+
+ dev->tstats = alloc_percpu(struct pcpu_tstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+ dev_hold(dev);
+ rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
+ return 0;
+}
+
+static struct xfrm_tunnel sit_handler __read_mostly = {
+ .handler = ipip6_rcv,
+ .err_handler = ipip6_err,
+ .priority = 1,
+};
+
+static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
+{
+ int prio;
+
+ for (prio = 1; prio < 4; prio++) {
+ int h;
+ for (h = 0; h < HASH_SIZE; h++) {
+ struct ip_tunnel *t;
+
+ t = rtnl_dereference(sitn->tunnels[prio][h]);
+ while (t != NULL) {
+ unregister_netdevice_queue(t->dev, head);
+ t = rtnl_dereference(t->next);
+ }
+ }
+ }
+}
+
+static int __net_init sit_init_net(struct net *net)
+{
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+ struct ip_tunnel *t;
+ int err;
+
+ sitn->tunnels[0] = sitn->tunnels_wc;
+ sitn->tunnels[1] = sitn->tunnels_l;
+ sitn->tunnels[2] = sitn->tunnels_r;
+ sitn->tunnels[3] = sitn->tunnels_r_l;
+
+ sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
+ ipip6_tunnel_setup);
+ if (!sitn->fb_tunnel_dev) {
+ err = -ENOMEM;
+ goto err_alloc_dev;
+ }
+ dev_net_set(sitn->fb_tunnel_dev, net);
+
+ err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
+ if (err)
+ goto err_dev_free;
+
+ ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
+
+ if ((err = register_netdev(sitn->fb_tunnel_dev)))
+ goto err_reg_dev;
+
+ t = netdev_priv(sitn->fb_tunnel_dev);
+
+ strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
+ return 0;
+
+err_reg_dev:
+ dev_put(sitn->fb_tunnel_dev);
+err_dev_free:
+ ipip6_dev_free(sitn->fb_tunnel_dev);
+err_alloc_dev:
+ return err;
+}
+
+static void __net_exit sit_exit_net(struct net *net)
+{
+ struct sit_net *sitn = net_generic(net, sit_net_id);
+ LIST_HEAD(list);
+
+ rtnl_lock();
+ sit_destroy_tunnels(sitn, &list);
+ unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+}
+
+static struct pernet_operations sit_net_ops = {
+ .init = sit_init_net,
+ .exit = sit_exit_net,
+ .id = &sit_net_id,
+ .size = sizeof(struct sit_net),
+};
+
+static void __exit sit_cleanup(void)
+{
+ xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
+
+ unregister_pernet_device(&sit_net_ops);
+ rcu_barrier(); /* Wait for completion of call_rcu()'s */
+}
+
+static int __init sit_init(void)
+{
+ int err;
+
+ printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
+
+ err = register_pernet_device(&sit_net_ops);
+ if (err < 0)
+ return err;
+ err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
+ if (err < 0) {
+ unregister_pernet_device(&sit_net_ops);
+ printk(KERN_INFO "sit init: Can't add protocol\n");
+ }
+ return err;
+}
+
+module_init(sit_init);
+module_exit(sit_cleanup);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_RTNL_LINK("sit");
+MODULE_ALIAS_NETDEV("sit0");