![Nicolas Dichtel](/assets/img/avatar_default.png)
Implement rtnl_link_ops->get_link_net() callback so that IFLA_LINK_NETNSID is added to rtnetlink messages. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
570 lines
15 KiB
C
570 lines
15 KiB
C
/*
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* Linux NET3: IP/IP protocol decoder.
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*
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* Authors:
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* Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
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*
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* Fixes:
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* Alan Cox : Merged and made usable non modular (its so tiny its silly as
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* a module taking up 2 pages).
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* Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
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* to keep ip_forward happy.
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* Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
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* Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL
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* David Woodhouse : Perform some basic ICMP handling.
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* IPIP Routing without decapsulation.
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* Carlos Picoto : GRE over IP support
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* Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
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* I do not want to merge them together.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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/* tunnel.c: an IP tunnel driver
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The purpose of this driver is to provide an IP tunnel through
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which you can tunnel network traffic transparently across subnets.
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This was written by looking at Nick Holloway's dummy driver
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Thanks for the great code!
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-Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
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Minor tweaks:
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Cleaned up the code a little and added some pre-1.3.0 tweaks.
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dev->hard_header/hard_header_len changed to use no headers.
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Comments/bracketing tweaked.
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Made the tunnels use dev->name not tunnel: when error reporting.
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Added tx_dropped stat
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-Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95
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Reworked:
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Changed to tunnel to destination gateway in addition to the
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tunnel's pointopoint address
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Almost completely rewritten
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Note: There is currently no firewall or ICMP handling done.
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-Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96
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*/
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/* Things I wish I had known when writing the tunnel driver:
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When the tunnel_xmit() function is called, the skb contains the
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packet to be sent (plus a great deal of extra info), and dev
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contains the tunnel device that _we_ are.
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When we are passed a packet, we are expected to fill in the
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source address with our source IP address.
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What is the proper way to allocate, copy and free a buffer?
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After you allocate it, it is a "0 length" chunk of memory
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starting at zero. If you want to add headers to the buffer
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later, you'll have to call "skb_reserve(skb, amount)" with
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the amount of memory you want reserved. Then, you call
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"skb_put(skb, amount)" with the amount of space you want in
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the buffer. skb_put() returns a pointer to the top (#0) of
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that buffer. skb->len is set to the amount of space you have
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"allocated" with skb_put(). You can then write up to skb->len
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bytes to that buffer. If you need more, you can call skb_put()
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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)".
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Now, to add header space, call "skb_push(skb, header_len)".
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This creates space at the beginning of the buffer and returns
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a pointer to this new space. If later you need to strip a
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header from a buffer, call "skb_pull(skb, header_len)".
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skb_headroom() will return how much space is left at the top
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of the buffer (before the main data). Remember, this headroom
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space must be reserved before the skb_put() function is called.
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*/
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/*
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This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c
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For comments look at net/ipv4/ip_gre.c --ANK
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*/
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#include <linux/capability.h>
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#include <linux/module.h>
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#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>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/if_arp.h>
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#include <linux/mroute.h>
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#include <linux/init.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/if_ether.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/ip_tunnels.h>
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#include <net/inet_ecn.h>
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#include <net/xfrm.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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static bool log_ecn_error = true;
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module_param(log_ecn_error, bool, 0644);
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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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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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/* All the routers (except for Linux) return only
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8 bytes of packet payload. It means, that precise relaying of
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ICMP in the real Internet is absolutely infeasible.
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*/
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struct net *net = dev_net(skb->dev);
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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;
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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,
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iph->daddr, iph->saddr, 0);
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if (t == NULL)
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goto out;
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if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
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ipv4_update_pmtu(skb, dev_net(skb->dev), info,
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t->parms.link, 0, IPPROTO_IPIP, 0);
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err = 0;
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goto out;
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}
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if (type == ICMP_REDIRECT) {
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ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
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IPPROTO_IPIP, 0);
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err = 0;
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goto out;
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}
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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)
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goto out;
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if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
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t->err_count++;
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else
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t->err_count = 1;
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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 = {
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/* no tunnel info required for ipip. */
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.proto = htons(ETH_P_IP),
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};
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static int ipip_rcv(struct sk_buff *skb)
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{
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struct net *net = dev_net(skb->dev);
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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;
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iph = ip_hdr(skb);
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tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
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iph->saddr, iph->daddr, 0);
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if (tunnel) {
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if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
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goto drop;
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if (iptunnel_pull_header(skb, 0, tpi.proto))
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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:
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kfree_skb(skb);
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return 0;
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}
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/*
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* This function assumes it is being called from dev_queue_xmit()
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* and that skb is filled properly by that function.
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*/
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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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skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
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if (IS_ERR(skb))
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goto out;
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skb_set_inner_ipproto(skb, IPPROTO_IPIP);
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ip_tunnel_xmit(skb, dev, tiph, tiph->protocol);
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return NETDEV_TX_OK;
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tx_error:
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kfree_skb(skb);
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out:
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dev->stats.tx_errors++;
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return NETDEV_TX_OK;
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}
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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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{
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int err = 0;
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struct ip_tunnel_parm p;
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if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
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return -EFAULT;
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if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
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if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
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p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
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return -EINVAL;
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}
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p.i_key = p.o_key = p.i_flags = p.o_flags = 0;
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if (p.iph.ttl)
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p.iph.frag_off |= htons(IP_DF);
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err = ip_tunnel_ioctl(dev, &p, cmd);
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if (err)
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return err;
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if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
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return -EFAULT;
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return 0;
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}
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static const struct net_device_ops ipip_netdev_ops = {
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.ndo_init = ipip_tunnel_init,
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.ndo_uninit = ip_tunnel_uninit,
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.ndo_start_xmit = ipip_tunnel_xmit,
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.ndo_do_ioctl = ipip_tunnel_ioctl,
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.ndo_change_mtu = ip_tunnel_change_mtu,
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.ndo_get_stats64 = ip_tunnel_get_stats64,
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};
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#define IPIP_FEATURES (NETIF_F_SG | \
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NETIF_F_FRAGLIST | \
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NETIF_F_HIGHDMA | \
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NETIF_F_GSO_SOFTWARE | \
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NETIF_F_HW_CSUM)
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static void ipip_tunnel_setup(struct net_device *dev)
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{
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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;
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dev->iflink = 0;
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dev->addr_len = 4;
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dev->features |= NETIF_F_LLTX;
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netif_keep_dst(dev);
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dev->features |= IPIP_FEATURES;
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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);
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memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
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tunnel->tun_hlen = 0;
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tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
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tunnel->parms.iph.protocol = IPPROTO_IPIP;
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return ip_tunnel_init(dev);
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}
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static void ipip_netlink_parms(struct nlattr *data[],
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struct ip_tunnel_parm *parms)
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{
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memset(parms, 0, sizeof(*parms));
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parms->iph.version = 4;
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parms->iph.protocol = IPPROTO_IPIP;
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parms->iph.ihl = 5;
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if (!data)
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return;
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if (data[IFLA_IPTUN_LINK])
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parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
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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]) {
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parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
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if (parms->iph.ttl)
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parms->iph.frag_off = htons(IP_DF);
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}
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if (data[IFLA_IPTUN_TOS])
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parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
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if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
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parms->iph.frag_off = htons(IP_DF);
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}
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/* This function returns true when ENCAP attributes are present in the nl msg */
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static bool ipip_netlink_encap_parms(struct nlattr *data[],
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struct ip_tunnel_encap *ipencap)
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{
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bool ret = false;
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memset(ipencap, 0, sizeof(*ipencap));
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if (!data)
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return ret;
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if (data[IFLA_IPTUN_ENCAP_TYPE]) {
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ret = true;
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ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
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}
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if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
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ret = true;
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ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
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}
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if (data[IFLA_IPTUN_ENCAP_SPORT]) {
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ret = true;
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ipencap->sport = nla_get_u16(data[IFLA_IPTUN_ENCAP_SPORT]);
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}
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if (data[IFLA_IPTUN_ENCAP_DPORT]) {
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ret = true;
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ipencap->dport = nla_get_u16(data[IFLA_IPTUN_ENCAP_DPORT]);
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}
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return ret;
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}
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static int ipip_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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{
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struct ip_tunnel_parm p;
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struct ip_tunnel_encap ipencap;
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if (ipip_netlink_encap_parms(data, &ipencap)) {
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struct ip_tunnel *t = netdev_priv(dev);
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int err = ip_tunnel_encap_setup(t, &ipencap);
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if (err < 0)
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return err;
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}
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ipip_netlink_parms(data, &p);
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return ip_tunnel_newlink(dev, tb, &p);
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}
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static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
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struct nlattr *data[])
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{
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struct ip_tunnel_parm p;
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struct ip_tunnel_encap ipencap;
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if (ipip_netlink_encap_parms(data, &ipencap)) {
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struct ip_tunnel *t = netdev_priv(dev);
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int err = ip_tunnel_encap_setup(t, &ipencap);
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if (err < 0)
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return err;
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}
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ipip_netlink_parms(data, &p);
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if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
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(!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
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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)
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{
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return
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/* IFLA_IPTUN_LINK */
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nla_total_size(4) +
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/* IFLA_IPTUN_LOCAL */
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nla_total_size(4) +
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/* IFLA_IPTUN_REMOTE */
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nla_total_size(4) +
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/* IFLA_IPTUN_TTL */
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nla_total_size(1) +
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/* IFLA_IPTUN_TOS */
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nla_total_size(1) +
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/* IFLA_IPTUN_PMTUDISC */
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nla_total_size(1) +
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/* IFLA_IPTUN_ENCAP_TYPE */
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nla_total_size(2) +
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/* IFLA_IPTUN_ENCAP_FLAGS */
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nla_total_size(2) +
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/* IFLA_IPTUN_ENCAP_SPORT */
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nla_total_size(2) +
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/* IFLA_IPTUN_ENCAP_DPORT */
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nla_total_size(2) +
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0;
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}
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static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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struct ip_tunnel_parm *parm = &tunnel->parms;
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if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
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nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
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nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
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nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
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nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
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nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
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!!(parm->iph.frag_off & htons(IP_DF))))
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goto nla_put_failure;
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if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
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tunnel->encap.type) ||
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nla_put_u16(skb, IFLA_IPTUN_ENCAP_SPORT,
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tunnel->encap.sport) ||
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nla_put_u16(skb, IFLA_IPTUN_ENCAP_DPORT,
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tunnel->encap.dport) ||
|
|
nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
|
|
tunnel->encap.flags))
|
|
goto nla_put_failure;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
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 },
|
|
[IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
|
|
};
|
|
|
|
static struct rtnl_link_ops ipip_link_ops __read_mostly = {
|
|
.kind = "ipip",
|
|
.maxtype = IFLA_IPTUN_MAX,
|
|
.policy = ipip_policy,
|
|
.priv_size = sizeof(struct ip_tunnel),
|
|
.setup = ipip_tunnel_setup,
|
|
.newlink = ipip_newlink,
|
|
.changelink = ipip_changelink,
|
|
.dellink = ip_tunnel_dellink,
|
|
.get_size = ipip_get_size,
|
|
.fill_info = ipip_fill_info,
|
|
.get_link_net = ip_tunnel_get_link_net,
|
|
};
|
|
|
|
static struct xfrm_tunnel ipip_handler __read_mostly = {
|
|
.handler = ipip_rcv,
|
|
.err_handler = ipip_err,
|
|
.priority = 1,
|
|
};
|
|
|
|
static int __net_init ipip_init_net(struct net *net)
|
|
{
|
|
return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
|
|
}
|
|
|
|
static void __net_exit ipip_exit_net(struct net *net)
|
|
{
|
|
struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
|
|
ip_tunnel_delete_net(itn, &ipip_link_ops);
|
|
}
|
|
|
|
static struct pernet_operations ipip_net_ops = {
|
|
.init = ipip_init_net,
|
|
.exit = ipip_exit_net,
|
|
.id = &ipip_net_id,
|
|
.size = sizeof(struct ip_tunnel_net),
|
|
};
|
|
|
|
static int __init ipip_init(void)
|
|
{
|
|
int err;
|
|
|
|
pr_info("ipip: IPv4 over IPv4 tunneling driver\n");
|
|
|
|
err = register_pernet_device(&ipip_net_ops);
|
|
if (err < 0)
|
|
return err;
|
|
err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
|
|
if (err < 0) {
|
|
pr_info("%s: can't register tunnel\n", __func__);
|
|
goto xfrm_tunnel_failed;
|
|
}
|
|
err = rtnl_link_register(&ipip_link_ops);
|
|
if (err < 0)
|
|
goto rtnl_link_failed;
|
|
|
|
out:
|
|
return err;
|
|
|
|
rtnl_link_failed:
|
|
xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
|
|
xfrm_tunnel_failed:
|
|
unregister_pernet_device(&ipip_net_ops);
|
|
goto out;
|
|
}
|
|
|
|
static void __exit ipip_fini(void)
|
|
{
|
|
rtnl_link_unregister(&ipip_link_ops);
|
|
if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
|
|
pr_info("%s: can't deregister tunnel\n", __func__);
|
|
|
|
unregister_pernet_device(&ipip_net_ops);
|
|
}
|
|
|
|
module_init(ipip_init);
|
|
module_exit(ipip_fini);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_RTNL_LINK("ipip");
|
|
MODULE_ALIAS_NETDEV("tunl0");
|