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net/ipv4/ipip.c
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/* |
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* Linux NET3: IP/IP protocol decoder. |
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* |
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* 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 |
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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 |
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-Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95 |
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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 |
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*/ /* 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 |
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find out how much more space you can allocate by calling |
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"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 */ |
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#include <linux/capability.h> |
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#include <linux/module.h> #include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#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> |
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#include <linux/if_ether.h> |
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#include <net/sock.h> #include <net/ip.h> #include <net/icmp.h> |
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#include <net/ip_tunnels.h> |
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#include <net/inet_ecn.h> #include <net/xfrm.h> |
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#include <net/net_namespace.h> #include <net/netns/generic.h> |
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static bool log_ecn_error = true; module_param(log_ecn_error, bool, 0644); MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
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static int ipip_net_id __read_mostly; |
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|
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static int ipip_tunnel_init(struct net_device *dev); |
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static struct rtnl_link_ops ipip_link_ops __read_mostly; |
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static int ipip_err(struct sk_buff *skb, u32 info) |
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{ |
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|
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/* All the routers (except for Linux) return only |
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8 bytes of packet payload. It means, that precise relaying of ICMP in the real Internet is absolutely infeasible. */ |
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struct net *net = dev_net(skb->dev); struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); |
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const struct iphdr *iph = (const struct iphdr *)skb->data; |
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struct ip_tunnel *t; |
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int err; |
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const int type = icmp_hdr(skb)->type; const int code = icmp_hdr(skb)->code; |
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err = -ENOENT; |
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t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, iph->daddr, iph->saddr, 0); |
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if (t == NULL) goto out; if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { ipv4_update_pmtu(skb, dev_net(skb->dev), info, t->dev->ifindex, 0, IPPROTO_IPIP, 0); err = 0; goto out; } |
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if (type == ICMP_REDIRECT) { ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, IPPROTO_IPIP, 0); err = 0; goto out; } |
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if (t->parms.iph.daddr == 0) |
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goto out; |
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err = 0; |
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if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) goto out; |
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if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
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t->err_count++; else t->err_count = 1; t->err_time = jiffies; |
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out: |
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return err; |
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} |
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static const struct tnl_ptk_info tpi = { /* no tunnel info required for ipip. */ .proto = htons(ETH_P_IP), }; |
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static int ipip_rcv(struct sk_buff *skb) { |
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struct net *net = dev_net(skb->dev); struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); |
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struct ip_tunnel *tunnel; |
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const struct iphdr *iph = ip_hdr(skb); |
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tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, iph->saddr, iph->daddr, 0); if (tunnel) { |
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if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) goto drop; |
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return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error); |
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} |
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return -1; |
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drop: kfree_skb(skb); return 0; |
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} /* * This function assumes it is being called from dev_queue_xmit() * and that skb is filled properly by that function. */ |
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static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct ip_tunnel *tunnel = netdev_priv(dev); |
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const struct iphdr *tiph = &tunnel->parms.iph; |
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if (unlikely(skb->protocol != htons(ETH_P_IP))) |
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goto tx_error; |
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if (likely(!skb->encapsulation)) { |
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skb_reset_inner_headers(skb); skb->encapsulation = 1; } |
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ip_tunnel_xmit(skb, dev, tiph); |
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return NETDEV_TX_OK; |
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tx_error: |
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dev->stats.tx_errors++; |
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dev_kfree_skb(skb); |
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return NETDEV_TX_OK; |
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} static int |
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ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
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{ int err = 0; struct ip_tunnel_parm p; |
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if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) return -EFAULT; |
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if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) return -EINVAL; } p.i_key = p.o_key = p.i_flags = p.o_flags = 0; |
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if (p.iph.ttl) p.iph.frag_off |= htons(IP_DF); err = ip_tunnel_ioctl(dev, &p, cmd); if (err) return err; if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) return -EFAULT; |
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return 0; } |
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static const struct net_device_ops ipip_netdev_ops = { |
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.ndo_init = ipip_tunnel_init, .ndo_uninit = ip_tunnel_uninit, |
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.ndo_start_xmit = ipip_tunnel_xmit, .ndo_do_ioctl = ipip_tunnel_ioctl, |
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.ndo_change_mtu = ip_tunnel_change_mtu, .ndo_get_stats64 = ip_tunnel_get_stats64, |
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}; |
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#define IPIP_FEATURES (NETIF_F_SG | \ NETIF_F_FRAGLIST | \ NETIF_F_HIGHDMA | \ NETIF_F_HW_CSUM) |
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static void ipip_tunnel_setup(struct net_device *dev) { |
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dev->netdev_ops = &ipip_netdev_ops; |
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dev->type = ARPHRD_TUNNEL; |
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dev->flags = IFF_NOARP; dev->iflink = 0; dev->addr_len = 4; |
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dev->features |= NETIF_F_NETNS_LOCAL; |
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dev->features |= NETIF_F_LLTX; |
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dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
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dev->features |= IPIP_FEATURES; dev->hw_features |= IPIP_FEATURES; |
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ip_tunnel_setup(dev, ipip_net_id); |
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} |
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static int ipip_tunnel_init(struct net_device *dev) |
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{ |
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struct ip_tunnel *tunnel = netdev_priv(dev); |
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memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); |
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tunnel->hlen = 0; tunnel->parms.iph.protocol = IPPROTO_IPIP; return ip_tunnel_init(dev); |
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} |
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static void ipip_netlink_parms(struct nlattr *data[], struct ip_tunnel_parm *parms) { memset(parms, 0, sizeof(*parms)); parms->iph.version = 4; parms->iph.protocol = IPPROTO_IPIP; parms->iph.ihl = 5; if (!data) return; if (data[IFLA_IPTUN_LINK]) parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); if (data[IFLA_IPTUN_LOCAL]) |
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parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
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if (data[IFLA_IPTUN_REMOTE]) |
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parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
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if (data[IFLA_IPTUN_TTL]) { parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); if (parms->iph.ttl) parms->iph.frag_off = htons(IP_DF); } if (data[IFLA_IPTUN_TOS]) parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) parms->iph.frag_off = htons(IP_DF); } static int ipip_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { |
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struct ip_tunnel_parm p; |
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ipip_netlink_parms(data, &p); return ip_tunnel_newlink(dev, tb, &p); |
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} static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { |
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struct ip_tunnel_parm p; |
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ipip_netlink_parms(data, &p); if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) return -EINVAL; |
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return ip_tunnel_changelink(dev, tb, &p); |
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} |
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static size_t ipip_get_size(const struct net_device *dev) { return /* IFLA_IPTUN_LINK */ nla_total_size(4) + /* IFLA_IPTUN_LOCAL */ nla_total_size(4) + /* IFLA_IPTUN_REMOTE */ nla_total_size(4) + /* IFLA_IPTUN_TTL */ nla_total_size(1) + /* IFLA_IPTUN_TOS */ nla_total_size(1) + |
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/* IFLA_IPTUN_PMTUDISC */ nla_total_size(1) + |
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0; } static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); struct ip_tunnel_parm *parm = &tunnel->parms; if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
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nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, !!(parm->iph.frag_off & htons(IP_DF)))) |
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goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; } |
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static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, }; |
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static struct rtnl_link_ops ipip_link_ops __read_mostly = { .kind = "ipip", .maxtype = IFLA_IPTUN_MAX, |
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.policy = ipip_policy, |
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.priv_size = sizeof(struct ip_tunnel), |
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.setup = ipip_tunnel_setup, .newlink = ipip_newlink, .changelink = ipip_changelink, |
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.dellink = ip_tunnel_dellink, |
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.get_size = ipip_get_size, .fill_info = ipip_fill_info, }; |
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static struct xfrm_tunnel ipip_handler __read_mostly = { |
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.handler = ipip_rcv, .err_handler = ipip_err, |
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.priority = 1, |
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}; |
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static int __net_init ipip_init_net(struct net *net) |
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{ |
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return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0"); |
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} |
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412 |
static void __net_exit ipip_exit_net(struct net *net) |
10dc4c7bb [IPIP]: Introduce... |
413 |
{ |
fd58156e4 IPIP: Use ip-tunn... |
414 415 |
struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); ip_tunnel_delete_net(itn); |
10dc4c7bb [IPIP]: Introduce... |
416 417 418 419 420 |
} static struct pernet_operations ipip_net_ops = { .init = ipip_init_net, .exit = ipip_exit_net, |
86de8a631 net: Simplify ipi... |
421 |
.id = &ipip_net_id, |
fd58156e4 IPIP: Use ip-tunn... |
422 |
.size = sizeof(struct ip_tunnel_net), |
10dc4c7bb [IPIP]: Introduce... |
423 |
}; |
1da177e4c Linux-2.6.12-rc2 |
424 425 426 |
static int __init ipip_init(void) { int err; |
fd58156e4 IPIP: Use ip-tunn... |
427 428 |
pr_info("ipip: IPv4 over IPv4 tunneling driver "); |
1da177e4c Linux-2.6.12-rc2 |
429 |
|
d5aa407f5 tunnels: fix netn... |
430 431 432 433 434 |
err = register_pernet_device(&ipip_net_ops); if (err < 0) return err; err = xfrm4_tunnel_register(&ipip_handler, AF_INET); if (err < 0) { |
058bd4d2a net: Convert prin... |
435 436 |
pr_info("%s: can't register tunnel ", __func__); |
0974658da ipip: advertise t... |
437 |
goto xfrm_tunnel_failed; |
1da177e4c Linux-2.6.12-rc2 |
438 |
} |
0974658da ipip: advertise t... |
439 440 441 442 443 |
err = rtnl_link_register(&ipip_link_ops); if (err < 0) goto rtnl_link_failed; out: |
1da177e4c Linux-2.6.12-rc2 |
444 |
return err; |
0974658da ipip: advertise t... |
445 446 447 448 449 450 |
rtnl_link_failed: xfrm4_tunnel_deregister(&ipip_handler, AF_INET); xfrm_tunnel_failed: unregister_pernet_device(&ipip_net_ops); goto out; |
1da177e4c Linux-2.6.12-rc2 |
451 452 453 454 |
} static void __exit ipip_fini(void) { |
0974658da ipip: advertise t... |
455 |
rtnl_link_unregister(&ipip_link_ops); |
c0d56408e [IPSEC]: Changing... |
456 |
if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) |
058bd4d2a net: Convert prin... |
457 458 |
pr_info("%s: can't deregister tunnel ", __func__); |
1da177e4c Linux-2.6.12-rc2 |
459 |
|
86de8a631 net: Simplify ipi... |
460 |
unregister_pernet_device(&ipip_net_ops); |
1da177e4c Linux-2.6.12-rc2 |
461 462 463 464 465 |
} module_init(ipip_init); module_exit(ipip_fini); MODULE_LICENSE("GPL"); |
8909c9ad8 net: don't allow ... |
466 |
MODULE_ALIAS_NETDEV("tunl0"); |