diff options
Diffstat (limited to 'net/ipv4/ipip.c')
| -rw-r--r-- | net/ipv4/ipip.c | 905 |
1 files changed, 905 insertions, 0 deletions
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c new file mode 100644 index 000000000000..68a78731f722 --- /dev/null +++ b/net/ipv4/ipip.c @@ -0,0 +1,905 @@ +/* + * Linux NET3: IP/IP protocol decoder. + * + * Version: $Id: ipip.c,v 1.50 2001/10/02 02:22:36 davem Exp $ + * + * Authors: + * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 + * + * Fixes: + * Alan Cox : Merged and made usable non modular (its so tiny its silly as + * a module taking up 2 pages). + * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) + * to keep ip_forward happy. + * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). + * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL + * David Woodhouse : Perform some basic ICMP handling. + * IPIP Routing without decapsulation. + * Carlos Picoto : GRE over IP support + * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c. + * I do not want to merge them together. + * + * 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. + * + */ + +/* tunnel.c: an IP tunnel driver + + The purpose of this driver is to provide an IP tunnel through + which you can tunnel network traffic transparently across subnets. + + This was written by looking at Nick Holloway's dummy driver + Thanks for the great code! + + -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 + + Minor tweaks: + Cleaned up the code a little and added some pre-1.3.0 tweaks. + dev->hard_header/hard_header_len changed to use no headers. + Comments/bracketing tweaked. + Made the tunnels use dev->name not tunnel: when error reporting. + Added tx_dropped stat + + -Alan Cox (Alan.Cox@linux.org) 21 March 95 + + Reworked: + Changed to tunnel to destination gateway in addition to the + tunnel's pointopoint address + Almost completely rewritten + Note: There is currently no firewall or ICMP handling done. + + -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96 + +*/ + +/* Things I wish I had known when writing the tunnel driver: + + When the tunnel_xmit() function is called, the skb contains the + packet to be sent (plus a great deal of extra info), and dev + contains the tunnel device that _we_ are. + + When we are passed a packet, we are expected to fill in the + source address with our source IP address. + + What is the proper way to allocate, copy and free a buffer? + After you allocate it, it is a "0 length" chunk of memory + starting at zero. If you want to add headers to the buffer + later, you'll have to call "skb_reserve(skb, amount)" with + the amount of memory you want reserved. Then, you call + "skb_put(skb, amount)" with the amount of space you want in + the buffer. skb_put() returns a pointer to the top (#0) of + that buffer. skb->len is set to the amount of space you have + "allocated" with skb_put(). You can then write up to skb->len + bytes to that buffer. If you need more, you can call skb_put() + again with the additional amount of space you need. You can + find out how much more space you can allocate by calling + "skb_tailroom(skb)". + Now, to add header space, call "skb_push(skb, header_len)". + This creates space at the beginning of the buffer and returns + a pointer to this new space. If later you need to strip a + header from a buffer, call "skb_pull(skb, header_len)". + skb_headroom() will return how much space is left at the top + of the buffer (before the main data). Remember, this headroom + space must be reserved before the skb_put() function is called. + */ + +/* + This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c + + For comments look at net/ipv4/ip_gre.c --ANK + */ + + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <asm/uaccess.h> +#include <linux/skbuff.h> +#include <linux/netdevice.h> +#include <linux/in.h> +#include <linux/tcp.h> +#include <linux/udp.h> +#include <linux/if_arp.h> +#include <linux/mroute.h> +#include <linux/init.h> +#include <linux/netfilter_ipv4.h> + +#include <net/sock.h> +#include <net/ip.h> +#include <net/icmp.h> +#include <net/protocol.h> +#include <net/ipip.h> +#include <net/inet_ecn.h> +#include <net/xfrm.h> + +#define HASH_SIZE 16 +#define HASH(addr) ((addr^(addr>>4))&0xF) + +static int ipip_fb_tunnel_init(struct net_device *dev); +static int ipip_tunnel_init(struct net_device *dev); +static void ipip_tunnel_setup(struct net_device *dev); + +static struct net_device *ipip_fb_tunnel_dev; + +static struct ip_tunnel *tunnels_r_l[HASH_SIZE]; +static struct ip_tunnel *tunnels_r[HASH_SIZE]; +static struct ip_tunnel *tunnels_l[HASH_SIZE]; +static struct ip_tunnel *tunnels_wc[1]; +static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l }; + +static DEFINE_RWLOCK(ipip_lock); + +static struct ip_tunnel * ipip_tunnel_lookup(u32 remote, u32 local) +{ + unsigned h0 = HASH(remote); + unsigned h1 = HASH(local); + struct ip_tunnel *t; + + for (t = 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 = tunnels_r[h0]; t; t = t->next) { + if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) + return t; + } + for (t = tunnels_l[h1]; t; t = t->next) { + if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) + return t; + } + if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) + return t; + return NULL; +} + +static struct ip_tunnel **ipip_bucket(struct ip_tunnel *t) +{ + u32 remote = t->parms.iph.daddr; + u32 local = t->parms.iph.saddr; + unsigned h = 0; + int prio = 0; + + if (remote) { + prio |= 2; + h ^= HASH(remote); + } + if (local) { + prio |= 1; + h ^= HASH(local); + } + return &tunnels[prio][h]; +} + + +static void ipip_tunnel_unlink(struct ip_tunnel *t) +{ + struct ip_tunnel **tp; + + for (tp = ipip_bucket(t); *tp; tp = &(*tp)->next) { + if (t == *tp) { + write_lock_bh(&ipip_lock); + *tp = t->next; + write_unlock_bh(&ipip_lock); + break; + } + } +} + +static void ipip_tunnel_link(struct ip_tunnel *t) +{ + struct ip_tunnel **tp = ipip_bucket(t); + + t->next = *tp; + write_lock_bh(&ipip_lock); + *tp = t; + write_unlock_bh(&ipip_lock); +} + +static struct ip_tunnel * ipip_tunnel_locate(struct ip_tunnel_parm *parms, int create) +{ + u32 remote = parms->iph.daddr; + u32 local = parms->iph.saddr; + struct ip_tunnel *t, **tp, *nt; + struct net_device *dev; + unsigned h = 0; + int prio = 0; + char name[IFNAMSIZ]; + + if (remote) { + prio |= 2; + h ^= HASH(remote); + } + if (local) { + prio |= 1; + h ^= HASH(local); + } + for (tp = &tunnels[prio][h]; (t = *tp) != NULL; tp = &t->next) { + if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) + return t; + } + if (!create) + return NULL; + + if (parms->name[0]) + strlcpy(name, parms->name, IFNAMSIZ); + else { + int i; + for (i=1; i<100; i++) { + sprintf(name, "tunl%d", i); + if (__dev_get_by_name(name) == NULL) + break; + } + if (i==100) + goto failed; + } + + dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); + if (dev == NULL) + return NULL; + + nt = dev->priv; + SET_MODULE_OWNER(dev); + dev->init = ipip_tunnel_init; + nt->parms = *parms; + + if (register_netdevice(dev) < 0) { + free_netdev(dev); + goto failed; + } + + dev_hold(dev); + ipip_tunnel_link(nt); + /* Do not decrement MOD_USE_COUNT here. */ + return nt; + +failed: + return NULL; +} + +static void ipip_tunnel_uninit(struct net_device *dev) +{ + if (dev == ipip_fb_tunnel_dev) { + write_lock_bh(&ipip_lock); + tunnels_wc[0] = NULL; + write_unlock_bh(&ipip_lock); + } else + ipip_tunnel_unlink((struct ip_tunnel*)dev->priv); + dev_put(dev); +} + +static void ipip_err(struct sk_buff *skb, void *__unused) +{ +#ifndef I_WISH_WORLD_WERE_PERFECT + +/* It is not :-( 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; + int type = skb->h.icmph->type; + int code = skb->h.icmph->code; + struct ip_tunnel *t; + + switch (type) { + default: + case ICMP_PARAMETERPROB: + return; + + case ICMP_DEST_UNREACH: + switch (code) { + case ICMP_SR_FAILED: + case ICMP_PORT_UNREACH: + /* Impossible event. */ + return; + case ICMP_FRAG_NEEDED: + /* Soft state for pmtu is maintained by IP core. */ + return; + 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; + break; + } + + read_lock(&ipip_lock); + t = ipip_tunnel_lookup(iph->daddr, iph->saddr); + if (t == NULL || t->parms.iph.daddr == 0) + goto out; + 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(&ipip_lock); + return; +#else + struct iphdr *iph = (struct iphdr*)dp; + int hlen = iph->ihl<<2; + struct iphdr *eiph; + int type = skb->h.icmph->type; + int code = skb->h.icmph->code; + int rel_type = 0; + int rel_code = 0; + int rel_info = 0; + struct sk_buff *skb2; + struct flowi fl; + struct rtable *rt; + + if (len < hlen + sizeof(struct iphdr)) + return; + eiph = (struct iphdr*)(dp + hlen); + + switch (type) { + default: + return; + case ICMP_PARAMETERPROB: + if (skb->h.icmph->un.gateway < hlen) + return; + + /* So... This guy found something strange INSIDE encapsulated + packet. Well, he is fool, but what can we do ? + */ + rel_type = ICMP_PARAMETERPROB; + rel_info = skb->h.icmph->un.gateway - hlen; + break; + + case ICMP_DEST_UNREACH: + switch (code) { + case ICMP_SR_FAILED: + case ICMP_PORT_UNREACH: + /* Impossible event. */ + return; + case ICMP_FRAG_NEEDED: + /* And it is the only really necessary thing :-) */ + rel_info = ntohs(skb->h.icmph->un.frag.mtu); + if (rel_info < hlen+68) + return; + rel_info -= hlen; + /* BSD 4.2 MORE DOES NOT EXIST IN NATURE. */ + if (rel_info > ntohs(eiph->tot_len)) + return; + break; + default: + /* All others are translated to HOST_UNREACH. + rfc2003 contains "deep thoughts" about NET_UNREACH, + I believe, it is just ether pollution. --ANK + */ + rel_type = ICMP_DEST_UNREACH; + rel_code = ICMP_HOST_UNREACH; + break; + } + break; + case ICMP_TIME_EXCEEDED: + if (code != ICMP_EXC_TTL) + return; + break; + } + + /* Prepare fake skb to feed it to icmp_send */ + skb2 = skb_clone(skb, GFP_ATOMIC); + if (skb2 == NULL) + return; + dst_release(skb2->dst); + skb2->dst = NULL; + skb_pull(skb2, skb->data - (u8*)eiph); + skb2->nh.raw = skb2->data; + + /* Try to guess incoming interface */ + memset(&fl, 0, sizeof(fl)); + fl.fl4_daddr = eiph->saddr; + fl.fl4_tos = RT_TOS(eiph->tos); + fl.proto = IPPROTO_IPIP; + if (ip_route_output_key(&rt, &key)) { + kfree_skb(skb2); + return; + } + skb2->dev = rt->u.dst.dev; + + /* route "incoming" packet */ + if (rt->rt_flags&RTCF_LOCAL) { + ip_rt_put(rt); + rt = NULL; + fl.fl4_daddr = eiph->daddr; + fl.fl4_src = eiph->saddr; + fl.fl4_tos = eiph->tos; + if (ip_route_output_key(&rt, &fl) || + rt->u.dst.dev->type != ARPHRD_TUNNEL) { + ip_rt_put(rt); + kfree_skb(skb2); + return; + } + } else { + ip_rt_put(rt); + if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, skb2->dev) || + skb2->dst->dev->type != ARPHRD_TUNNEL) { + kfree_skb(skb2); + return; + } + } + + /* change mtu on this route */ + if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { + if (rel_info > dst_mtu(skb2->dst)) { + kfree_skb(skb2); + return; + } + skb2->dst->ops->update_pmtu(skb2->dst, rel_info); + rel_info = htonl(rel_info); + } else if (type == ICMP_TIME_EXCEEDED) { + struct ip_tunnel *t = (struct ip_tunnel*)skb2->dev->priv; + if (t->parms.iph.ttl) { + rel_type = ICMP_DEST_UNREACH; + rel_code = ICMP_HOST_UNREACH; + } + } + + icmp_send(skb2, rel_type, rel_code, rel_info); + kfree_skb(skb2); + return; +#endif +} + +static inline void ipip_ecn_decapsulate(struct iphdr *outer_iph, struct sk_buff *skb) +{ + struct iphdr *inner_iph = skb->nh.iph; + + if (INET_ECN_is_ce(outer_iph->tos)) + IP_ECN_set_ce(inner_iph); +} + +static int ipip_rcv(struct sk_buff *skb) +{ + struct iphdr *iph; + struct ip_tunnel *tunnel; + + if (!pskb_may_pull(skb, sizeof(struct iphdr))) + goto out; + + iph = skb->nh.iph; + + read_lock(&ipip_lock); + if ((tunnel = ipip_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) { + if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { + read_unlock(&ipip_lock); + kfree_skb(skb); + return 0; + } + + secpath_reset(skb); + + skb->mac.raw = skb->nh.raw; + skb->nh.raw = skb->data; + memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); + skb->protocol = htons(ETH_P_IP); + skb->pkt_type = PACKET_HOST; + + tunnel->stat.rx_packets++; + tunnel->stat.rx_bytes += skb->len; + skb->dev = tunnel->dev; + dst_release(skb->dst); + skb->dst = NULL; + nf_reset(skb); + ipip_ecn_decapsulate(iph, skb); + netif_rx(skb); + read_unlock(&ipip_lock); + return 0; + } + read_unlock(&ipip_lock); + +out: + return -1; +} + +/* + * This function assumes it is being called from dev_queue_xmit() + * and that skb is filled properly by that function. + */ + +static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ip_tunnel *tunnel = (struct ip_tunnel*)dev->priv; + struct net_device_stats *stats = &tunnel->stat; + struct iphdr *tiph = &tunnel->parms.iph; + u8 tos = tunnel->parms.iph.tos; + u16 df = tiph->frag_off; + struct rtable *rt; /* Route to the other host */ + struct net_device *tdev; /* Device to other host */ + struct iphdr *old_iph = skb->nh.iph; + struct iphdr *iph; /* Our new IP header */ + int max_headroom; /* The extra header space needed */ + u32 dst = tiph->daddr; + int mtu; + + if (tunnel->recursion++) { + tunnel->stat.collisions++; + goto tx_error; + } + + if (skb->protocol != htons(ETH_P_IP)) + goto tx_error; + + if (tos&1) + tos = old_iph->tos; + + if (!dst) { + /* NBMA tunnel */ + if ((rt = (struct rtable*)skb->dst) == NULL) { + tunnel->stat.tx_fifo_errors++; + goto tx_error; + } + if ((dst = rt->rt_gateway) == 0) + goto tx_error_icmp; + } + + { + struct flowi fl = { .oif = tunnel->parms.link, + .nl_u = { .ip4_u = + { .daddr = dst, + .saddr = tiph->saddr, + .tos = RT_TOS(tos) } }, + .proto = IPPROTO_IPIP }; + if (ip_route_output_key(&rt, &fl)) { + 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 (skb->dst) + skb->dst->ops->update_pmtu(skb->dst, mtu); + + df |= (old_iph->frag_off&htons(IP_DF)); + + if ((old_iph->frag_off&htons(IP_DF)) && mtu < ntohs(old_iph->tot_len)) { + icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); + 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_cloned(skb) || skb_shared(skb)) { + 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; + old_iph = skb->nh.iph; + } + + skb->h.raw = skb->nh.raw; + skb->nh.raw = skb_push(skb, sizeof(struct iphdr)); + memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); + dst_release(skb->dst); + skb->dst = &rt->u.dst; + + /* + * Push down and install the IPIP header. + */ + + iph = skb->nh.iph; + iph->version = 4; + iph->ihl = sizeof(struct iphdr)>>2; + iph->frag_off = df; + iph->protocol = IPPROTO_IPIP; + iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); + iph->daddr = rt->rt_dst; + iph->saddr = rt->rt_src; + + if ((iph->ttl = tiph->ttl) == 0) + iph->ttl = old_iph->ttl; + + 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 int +ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) +{ + int err = 0; + struct ip_tunnel_parm p; + struct ip_tunnel *t; + + switch (cmd) { + case SIOCGETTUNNEL: + t = NULL; + if (dev == ipip_fb_tunnel_dev) { + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { + err = -EFAULT; + break; + } + t = ipip_tunnel_locate(&p, 0); + } + if (t == NULL) + t = (struct ip_tunnel*)dev->priv; + 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_IPIP || + 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 = ipip_tunnel_locate(&p, cmd == SIOCADDTUNNEL); + + if (dev != ipip_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 = (struct ip_tunnel*)dev->priv; + ipip_tunnel_unlink(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); + ipip_tunnel_link(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; + t->parms.iph.frag_off = p.iph.frag_off; + } + 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 == ipip_fb_tunnel_dev) { + err = -EFAULT; + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) + goto done; + err = -ENOENT; + if ((t = ipip_tunnel_locate(&p, 0)) == NULL) + goto done; + err = -EPERM; + if (t->dev == ipip_fb_tunnel_dev) + goto done; + dev = t->dev; + } + err = unregister_netdevice(dev); + break; + + default: + err = -EINVAL; + } + +done: + return err; +} + +static struct net_device_stats *ipip_tunnel_get_stats(struct net_device *dev) +{ + return &(((struct ip_tunnel*)dev->priv)->stat); +} + +static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) +{ + if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) + return -EINVAL; + dev->mtu = new_mtu; + return 0; +} + +static void ipip_tunnel_setup(struct net_device *dev) +{ + SET_MODULE_OWNER(dev); + dev->uninit = ipip_tunnel_uninit; + dev->hard_start_xmit = ipip_tunnel_xmit; + dev->get_stats = ipip_tunnel_get_stats; + dev->do_ioctl = ipip_tunnel_ioctl; + dev->change_mtu = ipip_tunnel_change_mtu; + dev->destructor = free_netdev; + + dev->type = ARPHRD_TUNNEL; + dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); + dev->mtu = 1500 - sizeof(struct iphdr); + dev->flags = IFF_NOARP; + dev->iflink = 0; + dev->addr_len = 4; +} + +static int ipip_tunnel_init(struct net_device *dev) +{ + struct net_device *tdev = NULL; + struct ip_tunnel *tunnel; + struct iphdr *iph; + + tunnel = (struct ip_tunnel*)dev->priv; + iph = &tunnel->parms.iph; + + 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); + + if (iph->daddr) { + struct flowi fl = { .oif = tunnel->parms.link, + .nl_u = { .ip4_u = + { .daddr = iph->daddr, + .saddr = iph->saddr, + .tos = RT_TOS(iph->tos) } }, + .proto = IPPROTO_IPIP }; + struct rtable *rt; + if (!ip_route_output_key(&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(tunnel->parms.link); + + if (tdev) { + dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); + dev->mtu = tdev->mtu - sizeof(struct iphdr); + } + dev->iflink = tunnel->parms.link; + + return 0; +} + +static int __init ipip_fb_tunnel_init(struct net_device *dev) +{ + struct ip_tunnel *tunnel = dev->priv; + struct iphdr *iph = &tunnel->parms.iph; + + tunnel->dev = dev; + strcpy(tunnel->parms.name, dev->name); + + iph->version = 4; + iph->protocol = IPPROTO_IPIP; + iph->ihl = 5; + + dev_hold(dev); + tunnels_wc[0] = tunnel; + return 0; +} + +static struct xfrm_tunnel ipip_handler = { + .handler = ipip_rcv, + .err_handler = ipip_err, +}; + +static char banner[] __initdata = + KERN_INFO "IPv4 over IPv4 tunneling driver\n"; + +static int __init ipip_init(void) +{ + int err; + + printk(banner); + + if (xfrm4_tunnel_register(&ipip_handler) < 0) { + printk(KERN_INFO "ipip init: can't register tunnel\n"); + return -EAGAIN; + } + + ipip_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), + "tunl0", + ipip_tunnel_setup); + if (!ipip_fb_tunnel_dev) { + err = -ENOMEM; + goto err1; + } + + ipip_fb_tunnel_dev->init = ipip_fb_tunnel_init; + + if ((err = register_netdev(ipip_fb_tunnel_dev))) + goto err2; + out: + return err; + err2: + free_netdev(ipip_fb_tunnel_dev); + err1: + xfrm4_tunnel_deregister(&ipip_handler); + goto out; +} + +static void __exit ipip_fini(void) +{ + if (xfrm4_tunnel_deregister(&ipip_handler) < 0) + printk(KERN_INFO "ipip close: can't deregister tunnel\n"); + + unregister_netdev(ipip_fb_tunnel_dev); +} + +module_init(ipip_init); +module_exit(ipip_fini); +MODULE_LICENSE("GPL"); |