/* * 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> * * $Id: sit.c,v 1.53 2001/09/25 05:09:53 davem Exp $ * * 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 <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_fb_tunnel_init(struct net_device *dev); static int ipip6_tunnel_init(struct net_device *dev); static void ipip6_tunnel_setup(struct net_device *dev); static int sit_net_id; struct sit_net { struct ip_tunnel *tunnels_r_l[HASH_SIZE]; struct ip_tunnel *tunnels_r[HASH_SIZE]; struct ip_tunnel *tunnels_l[HASH_SIZE]; struct ip_tunnel *tunnels_wc[1]; struct ip_tunnel **tunnels[4]; struct net_device *fb_tunnel_dev; }; static DEFINE_RWLOCK(ipip6_lock); static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, __be32 remote, __be32 local) { unsigned h0 = HASH(remote); unsigned h1 = HASH(local); struct ip_tunnel *t; struct sit_net *sitn = net_generic(net, sit_net_id); for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) { if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) return t; } for (t = sitn->tunnels_r[h0]; t; t = t->next) { if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) return t; } for (t = sitn->tunnels_l[h1]; t; t = t->next) { if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) return t; } if ((t = sitn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) return t; return NULL; } static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, struct ip_tunnel_parm *parms) { __be32 remote = parms->iph.daddr; __be32 local = parms->iph.saddr; unsigned 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 **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 **tp; for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { if (t == *tp) { write_lock_bh(&ipip6_lock); *tp = t->next; write_unlock_bh(&ipip6_lock); break; } } } static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) { struct ip_tunnel **tp = ipip6_bucket(sitn, t); t->next = *tp; write_lock_bh(&ipip6_lock); *tp = t; write_unlock_bh(&ipip6_lock); } 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, **tp, *nt; struct net_device *dev; char name[IFNAMSIZ]; struct sit_net *sitn = net_generic(net, sit_net_id); for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) return t; } if (!create) goto failed; if (parms->name[0]) strlcpy(name, parms->name, IFNAMSIZ); else sprintf(name, "sit%%d"); dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); if (dev == NULL) return NULL; dev_net_set(dev, net); if (strchr(name, '%')) { if (dev_alloc_name(dev, name) < 0) goto failed_free; } nt = netdev_priv(dev); dev->init = ipip6_tunnel_init; nt->parms = *parms; if (parms->i_flags & SIT_ISATAP) dev->priv_flags |= IFF_ISATAP; if (register_netdevice(dev) < 0) goto failed_free; dev_hold(dev); ipip6_tunnel_link(sitn, nt); return nt; failed_free: free_netdev(dev); failed: return NULL; } static struct ip_tunnel_prl_entry * __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) { struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL; for (p = t->prl; p; p = p->next) if (p->addr == addr) break; return p; } 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; read_lock(&ipip6_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 (prl = t->prl; prl; prl = prl->next) { 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: read_unlock(&ipip6_lock); 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; write_lock(&ipip6_lock); for (p = t->prl; p; p = p->next) { if (p->addr == a->addr) { if (chg) goto update; 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; t->prl = p; t->prl_count++; update: p->addr = a->addr; p->flags = a->flags; out: write_unlock(&ipip6_lock); return err; } static int ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) { struct ip_tunnel_prl_entry *x, **p; int err = 0; write_lock(&ipip6_lock); if (a && a->addr != htonl(INADDR_ANY)) { for (p = &t->prl; *p; p = &(*p)->next) { if ((*p)->addr == a->addr) { x = *p; *p = x->next; kfree(x); t->prl_count--; goto out; } } err = -ENXIO; } else { while (t->prl) { x = t->prl; t->prl = t->prl->next; kfree(x); t->prl_count--; } } out: write_unlock(&ipip6_lock); return 0; } static int isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) { struct ip_tunnel_prl_entry *p; int ok = 1; read_lock(&ipip6_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 { 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; } read_unlock(&ipip6_lock); 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) { write_lock_bh(&ipip6_lock); sitn->tunnels_wc[0] = NULL; write_unlock_bh(&ipip6_lock); dev_put(dev); } 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. */ struct iphdr *iph = (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; read_lock(&ipip6_lock); t = ipip6_tunnel_lookup(dev_net(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 (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) t->err_count++; else t->err_count = 1; t->err_time = jiffies; out: read_unlock(&ipip6_lock); return err; } static inline void ipip6_ecn_decapsulate(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) { struct iphdr *iph; struct ip_tunnel *tunnel; if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) goto out; iph = ip_hdr(skb); read_lock(&ipip6_lock); if ((tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr)) != NULL) { 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->stat.rx_errors++; read_unlock(&ipip6_lock); kfree_skb(skb); return 0; } tunnel->stat.rx_packets++; tunnel->stat.rx_bytes += skb->len; skb->dev = tunnel->dev; dst_release(skb->dst); skb->dst = NULL; nf_reset(skb); ipip6_ecn_decapsulate(iph, skb); netif_rx(skb); read_unlock(&ipip6_lock); return 0; } icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); read_unlock(&ipip6_lock); out: kfree_skb(skb); return 0; } /* Returns the embedded IPv4 address if the IPv6 address comes from 6to4 (RFC 3056) addr space */ static inline __be32 try_6to4(struct in6_addr *v6dst) { __be32 dst = 0; 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); } return dst; } /* * This function assumes it is being called from dev_queue_xmit() * and that skb is filled properly by that function. */ static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); struct net_device_stats *stats = &tunnel->stat; struct iphdr *tiph = &tunnel->parms.iph; struct ipv6hdr *iph6 = ipv6_hdr(skb); u8 tos = tunnel->parms.iph.tos; 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; int mtu; struct in6_addr *addr6; int addr_type; if (tunnel->recursion++) { tunnel->stat.collisions++; goto tx_error; } if (skb->protocol != htons(ETH_P_IPV6)) goto tx_error; /* ISATAP (RFC4214) - must come before 6to4 */ if (dev->priv_flags & IFF_ISATAP) { struct neighbour *neigh = NULL; if (skb->dst) neigh = skb->dst->neighbour; if (neigh == NULL) { if (net_ratelimit()) printk(KERN_DEBUG "sit: nexthop == NULL\n"); goto tx_error; } addr6 = (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 goto tx_error; } if (!dst) dst = try_6to4(&iph6->daddr); if (!dst) { struct neighbour *neigh = NULL; if (skb->dst) neigh = skb->dst->neighbour; if (neigh == NULL) { if (net_ratelimit()) printk(KERN_DEBUG "sit: nexthop == NULL\n"); goto tx_error; } addr6 = (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) goto tx_error_icmp; dst = addr6->s6_addr32[3]; } { struct flowi fl = { .nl_u = { .ip4_u = { .daddr = dst, .saddr = tiph->saddr, .tos = RT_TOS(tos) } }, .oif = tunnel->parms.link, .proto = IPPROTO_IPV6 }; if (ip_route_output_key(dev_net(dev), &rt, &fl)) { tunnel->stat.tx_carrier_errors++; goto tx_error_icmp; } } if (rt->rt_type != RTN_UNICAST) { ip_rt_put(rt); tunnel->stat.tx_carrier_errors++; goto tx_error_icmp; } tdev = rt->u.dst.dev; if (tdev == dev) { ip_rt_put(rt); tunnel->stat.collisions++; goto tx_error; } if (tiph->frag_off) mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); else mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; if (mtu < 68) { tunnel->stat.collisions++; ip_rt_put(rt); goto tx_error; } if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; if (tunnel->parms.iph.daddr && skb->dst) skb->dst->ops->update_pmtu(skb->dst, mtu); if (skb->len > mtu) { icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); ip_rt_put(rt); goto tx_error; } if (tunnel->err_count > 0) { if (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); stats->tx_dropped++; dev_kfree_skb(skb); tunnel->recursion--; return 0; } 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; dst_release(skb->dst); skb->dst = &rt->u.dst; /* * Push down and install the IPIP header. */ iph = ip_hdr(skb); iph->version = 4; iph->ihl = sizeof(struct iphdr)>>2; if (mtu > IPV6_MIN_MTU) iph->frag_off = htons(IP_DF); else iph->frag_off = 0; iph->protocol = IPPROTO_IPV6; iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); iph->daddr = rt->rt_dst; iph->saddr = rt->rt_src; if ((iph->ttl = tiph->ttl) == 0) iph->ttl = iph6->hop_limit; nf_reset(skb); IPTUNNEL_XMIT(); tunnel->recursion--; return 0; tx_error_icmp: dst_link_failure(skb); tx_error: stats->tx_errors++; dev_kfree_skb(skb); tunnel->recursion--; return 0; } static void ipip6_tunnel_bind_dev(struct net_device *dev) { struct net_device *tdev = NULL; struct ip_tunnel *tunnel; struct iphdr *iph; tunnel = netdev_priv(dev); iph = &tunnel->parms.iph; if (iph->daddr) { struct flowi fl = { .nl_u = { .ip4_u = { .daddr = iph->daddr, .saddr = iph->saddr, .tos = RT_TOS(iph->tos) } }, .oif = tunnel->parms.link, .proto = IPPROTO_IPV6 }; struct rtable *rt; if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { tdev = rt->u.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); switch (cmd) { case SIOCGETTUNNEL: 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); 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)) 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); 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; default: err = -EINVAL; } done: return err; } static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev) { return &(((struct ip_tunnel*)netdev_priv(dev))->stat); } 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 void ipip6_tunnel_setup(struct net_device *dev) { dev->uninit = ipip6_tunnel_uninit; dev->destructor = free_netdev; dev->hard_start_xmit = ipip6_tunnel_xmit; dev->get_stats = ipip6_tunnel_get_stats; dev->do_ioctl = ipip6_tunnel_ioctl; dev->change_mtu = ipip6_tunnel_change_mtu; 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->iflink = 0; dev->addr_len = 4; dev->features |= NETIF_F_NETNS_LOCAL; } static int ipip6_tunnel_init(struct net_device *dev) { struct ip_tunnel *tunnel; tunnel = netdev_priv(dev); tunnel->dev = dev; strcpy(tunnel->parms.name, dev->name); memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); ipip6_tunnel_bind_dev(dev); return 0; } static int 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_hold(dev); sitn->tunnels_wc[0] = tunnel; return 0; } static struct xfrm_tunnel sit_handler = { .handler = ipip6_rcv, .err_handler = ipip6_err, .priority = 1, }; static void sit_destroy_tunnels(struct sit_net *sitn) { int prio; for (prio = 1; prio < 4; prio++) { int h; for (h = 0; h < HASH_SIZE; h++) { struct ip_tunnel *t; while ((t = sitn->tunnels[prio][h]) != NULL) unregister_netdevice(t->dev); } } } static int sit_init_net(struct net *net) { int err; struct sit_net *sitn; err = -ENOMEM; sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL); if (sitn == NULL) goto err_alloc; err = net_assign_generic(net, sit_net_id, sitn); if (err < 0) goto err_assign; 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; } sitn->fb_tunnel_dev->init = ipip6_fb_tunnel_init; dev_net_set(sitn->fb_tunnel_dev, net); if ((err = register_netdev(sitn->fb_tunnel_dev))) goto err_reg_dev; return 0; err_reg_dev: free_netdev(sitn->fb_tunnel_dev); err_alloc_dev: /* nothing */ err_assign: kfree(sitn); err_alloc: return err; } static void sit_exit_net(struct net *net) { struct sit_net *sitn; sitn = net_generic(net, sit_net_id); rtnl_lock(); sit_destroy_tunnels(sitn); unregister_netdevice(sitn->fb_tunnel_dev); rtnl_unlock(); kfree(sitn); } static struct pernet_operations sit_net_ops = { .init = sit_init_net, .exit = sit_exit_net, }; static void __exit sit_cleanup(void) { xfrm4_tunnel_deregister(&sit_handler, AF_INET6); unregister_pernet_gen_device(sit_net_id, &sit_net_ops); } static int __init sit_init(void) { int err; printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { printk(KERN_INFO "sit init: Can't add protocol\n"); return -EAGAIN; } err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); if (err < 0) xfrm4_tunnel_deregister(&sit_handler, AF_INET6); return err; } module_init(sit_init); module_exit(sit_cleanup); MODULE_LICENSE("GPL"); MODULE_ALIAS("sit0");