![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>
594 lines
14 KiB
C
594 lines
14 KiB
C
/*
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* Linux NET3: IP/IP protocol decoder modified to support
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* virtual tunnel interface
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*
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* Authors:
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* Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
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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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/*
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This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.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/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 <linux/icmpv6.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 struct rtnl_link_ops vti_link_ops __read_mostly;
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static int vti_net_id __read_mostly;
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static int vti_tunnel_init(struct net_device *dev);
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static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
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int encap_type)
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{
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struct ip_tunnel *tunnel;
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const struct iphdr *iph = ip_hdr(skb);
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struct net *net = dev_net(skb->dev);
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struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
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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 != NULL) {
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if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
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goto drop;
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XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
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skb->mark = be32_to_cpu(tunnel->parms.i_key);
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return xfrm_input(skb, nexthdr, spi, encap_type);
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}
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return -EINVAL;
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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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static int vti_rcv(struct sk_buff *skb)
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{
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XFRM_SPI_SKB_CB(skb)->family = AF_INET;
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XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
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return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
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}
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static int vti_rcv_cb(struct sk_buff *skb, int err)
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{
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unsigned short family;
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struct net_device *dev;
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struct pcpu_sw_netstats *tstats;
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struct xfrm_state *x;
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struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
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if (!tunnel)
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return 1;
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dev = tunnel->dev;
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if (err) {
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dev->stats.rx_errors++;
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dev->stats.rx_dropped++;
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return 0;
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}
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x = xfrm_input_state(skb);
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family = x->inner_mode->afinfo->family;
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if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family))
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return -EPERM;
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skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
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skb->dev = dev;
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tstats = this_cpu_ptr(dev->tstats);
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u64_stats_update_begin(&tstats->syncp);
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tstats->rx_packets++;
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tstats->rx_bytes += skb->len;
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u64_stats_update_end(&tstats->syncp);
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return 0;
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}
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static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
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{
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xfrm_address_t *daddr = (xfrm_address_t *)&dst;
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xfrm_address_t *saddr = (xfrm_address_t *)&src;
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/* if there is no transform then this tunnel is not functional.
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* Or if the xfrm is not mode tunnel.
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*/
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if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
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x->props.family != AF_INET)
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return false;
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if (!dst)
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return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
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if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
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return false;
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return true;
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}
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static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
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struct flowi *fl)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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struct ip_tunnel_parm *parms = &tunnel->parms;
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struct dst_entry *dst = skb_dst(skb);
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struct net_device *tdev; /* Device to other host */
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int err;
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if (!dst) {
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dev->stats.tx_carrier_errors++;
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goto tx_error_icmp;
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}
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dst_hold(dst);
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dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
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if (IS_ERR(dst)) {
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dev->stats.tx_carrier_errors++;
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goto tx_error_icmp;
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}
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if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
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dev->stats.tx_carrier_errors++;
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dst_release(dst);
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goto tx_error_icmp;
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}
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tdev = dst->dev;
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if (tdev == dev) {
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dst_release(dst);
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dev->stats.collisions++;
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goto tx_error;
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}
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if (tunnel->err_count > 0) {
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if (time_before(jiffies,
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tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
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tunnel->err_count--;
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dst_link_failure(skb);
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} else
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tunnel->err_count = 0;
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}
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skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
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skb_dst_set(skb, dst);
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skb->dev = skb_dst(skb)->dev;
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err = dst_output(skb);
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if (net_xmit_eval(err) == 0)
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err = skb->len;
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iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
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return NETDEV_TX_OK;
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tx_error_icmp:
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dst_link_failure(skb);
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tx_error:
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dev->stats.tx_errors++;
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kfree_skb(skb);
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return NETDEV_TX_OK;
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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 vti_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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struct flowi fl;
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memset(&fl, 0, sizeof(fl));
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skb->mark = be32_to_cpu(tunnel->parms.o_key);
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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xfrm_decode_session(skb, &fl, AF_INET);
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memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
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break;
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case htons(ETH_P_IPV6):
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xfrm_decode_session(skb, &fl, AF_INET6);
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memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
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break;
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default:
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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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}
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return vti_xmit(skb, dev, &fl);
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}
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static int vti4_err(struct sk_buff *skb, u32 info)
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{
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__be32 spi;
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__u32 mark;
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struct xfrm_state *x;
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struct ip_tunnel *tunnel;
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struct ip_esp_hdr *esph;
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struct ip_auth_hdr *ah ;
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struct ip_comp_hdr *ipch;
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struct net *net = dev_net(skb->dev);
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const struct iphdr *iph = (const struct iphdr *)skb->data;
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int protocol = iph->protocol;
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struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
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tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
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iph->daddr, iph->saddr, 0);
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if (!tunnel)
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return -1;
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mark = be32_to_cpu(tunnel->parms.o_key);
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switch (protocol) {
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case IPPROTO_ESP:
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esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
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spi = esph->spi;
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break;
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case IPPROTO_AH:
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ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
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spi = ah->spi;
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break;
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case IPPROTO_COMP:
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ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
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spi = htonl(ntohs(ipch->cpi));
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break;
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default:
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return 0;
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}
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switch (icmp_hdr(skb)->type) {
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case ICMP_DEST_UNREACH:
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if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
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return 0;
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case ICMP_REDIRECT:
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break;
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default:
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return 0;
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}
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x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
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spi, protocol, AF_INET);
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if (!x)
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return 0;
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if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
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ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
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else
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ipv4_redirect(skb, net, 0, 0, protocol, 0);
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xfrm_state_put(x);
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return 0;
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}
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static int
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vti_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)
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return -EINVAL;
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}
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if (!(p.i_flags & GRE_KEY))
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p.i_key = 0;
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if (!(p.o_flags & GRE_KEY))
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p.o_key = 0;
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p.i_flags = VTI_ISVTI;
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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 (cmd != SIOCDELTUNNEL) {
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p.i_flags |= GRE_KEY;
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p.o_flags |= GRE_KEY;
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}
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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 vti_netdev_ops = {
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.ndo_init = vti_tunnel_init,
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.ndo_uninit = ip_tunnel_uninit,
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.ndo_start_xmit = vti_tunnel_xmit,
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.ndo_do_ioctl = vti_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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static void vti_tunnel_setup(struct net_device *dev)
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{
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dev->netdev_ops = &vti_netdev_ops;
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dev->type = ARPHRD_TUNNEL;
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ip_tunnel_setup(dev, vti_net_id);
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}
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static int vti_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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struct iphdr *iph = &tunnel->parms.iph;
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memcpy(dev->dev_addr, &iph->saddr, 4);
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memcpy(dev->broadcast, &iph->daddr, 4);
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dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
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dev->mtu = ETH_DATA_LEN;
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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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return ip_tunnel_init(dev);
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}
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static void __net_init vti_fb_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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struct iphdr *iph = &tunnel->parms.iph;
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iph->version = 4;
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iph->protocol = IPPROTO_IPIP;
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iph->ihl = 5;
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}
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static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
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.handler = vti_rcv,
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.input_handler = vti_input,
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.cb_handler = vti_rcv_cb,
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.err_handler = vti4_err,
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.priority = 100,
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};
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static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
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.handler = vti_rcv,
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.input_handler = vti_input,
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.cb_handler = vti_rcv_cb,
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.err_handler = vti4_err,
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.priority = 100,
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};
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static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
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.handler = vti_rcv,
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.input_handler = vti_input,
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.cb_handler = vti_rcv_cb,
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.err_handler = vti4_err,
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.priority = 100,
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};
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static int __net_init vti_init_net(struct net *net)
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{
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int err;
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struct ip_tunnel_net *itn;
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err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
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if (err)
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return err;
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itn = net_generic(net, vti_net_id);
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vti_fb_tunnel_init(itn->fb_tunnel_dev);
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return 0;
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}
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static void __net_exit vti_exit_net(struct net *net)
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{
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struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
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ip_tunnel_delete_net(itn, &vti_link_ops);
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}
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static struct pernet_operations vti_net_ops = {
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.init = vti_init_net,
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.exit = vti_exit_net,
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.id = &vti_net_id,
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.size = sizeof(struct ip_tunnel_net),
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};
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static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
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{
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return 0;
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}
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static void vti_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.protocol = IPPROTO_IPIP;
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if (!data)
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return;
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parms->i_flags = VTI_ISVTI;
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if (data[IFLA_VTI_LINK])
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parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
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if (data[IFLA_VTI_IKEY])
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parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
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if (data[IFLA_VTI_OKEY])
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parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
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if (data[IFLA_VTI_LOCAL])
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parms->iph.saddr = nla_get_be32(data[IFLA_VTI_LOCAL]);
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if (data[IFLA_VTI_REMOTE])
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parms->iph.daddr = nla_get_be32(data[IFLA_VTI_REMOTE]);
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}
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static int vti_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 parms;
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vti_netlink_parms(data, &parms);
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return ip_tunnel_newlink(dev, tb, &parms);
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}
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static int vti_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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vti_netlink_parms(data, &p);
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return ip_tunnel_changelink(dev, tb, &p);
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}
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static size_t vti_get_size(const struct net_device *dev)
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{
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return
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/* IFLA_VTI_LINK */
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nla_total_size(4) +
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/* IFLA_VTI_IKEY */
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nla_total_size(4) +
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/* IFLA_VTI_OKEY */
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nla_total_size(4) +
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/* IFLA_VTI_LOCAL */
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nla_total_size(4) +
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/* IFLA_VTI_REMOTE */
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nla_total_size(4) +
|
|
0;
|
|
}
|
|
|
|
static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
|
{
|
|
struct ip_tunnel *t = netdev_priv(dev);
|
|
struct ip_tunnel_parm *p = &t->parms;
|
|
|
|
nla_put_u32(skb, IFLA_VTI_LINK, p->link);
|
|
nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
|
|
nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
|
|
nla_put_be32(skb, IFLA_VTI_LOCAL, p->iph.saddr);
|
|
nla_put_be32(skb, IFLA_VTI_REMOTE, p->iph.daddr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
|
|
[IFLA_VTI_LINK] = { .type = NLA_U32 },
|
|
[IFLA_VTI_IKEY] = { .type = NLA_U32 },
|
|
[IFLA_VTI_OKEY] = { .type = NLA_U32 },
|
|
[IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
|
|
[IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
|
|
};
|
|
|
|
static struct rtnl_link_ops vti_link_ops __read_mostly = {
|
|
.kind = "vti",
|
|
.maxtype = IFLA_VTI_MAX,
|
|
.policy = vti_policy,
|
|
.priv_size = sizeof(struct ip_tunnel),
|
|
.setup = vti_tunnel_setup,
|
|
.validate = vti_tunnel_validate,
|
|
.newlink = vti_newlink,
|
|
.changelink = vti_changelink,
|
|
.dellink = ip_tunnel_dellink,
|
|
.get_size = vti_get_size,
|
|
.fill_info = vti_fill_info,
|
|
.get_link_net = ip_tunnel_get_link_net,
|
|
};
|
|
|
|
static int __init vti_init(void)
|
|
{
|
|
const char *msg;
|
|
int err;
|
|
|
|
pr_info("IPv4 over IPsec tunneling driver\n");
|
|
|
|
msg = "tunnel device";
|
|
err = register_pernet_device(&vti_net_ops);
|
|
if (err < 0)
|
|
goto pernet_dev_failed;
|
|
|
|
msg = "tunnel protocols";
|
|
err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
|
|
if (err < 0)
|
|
goto xfrm_proto_esp_failed;
|
|
err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
|
|
if (err < 0)
|
|
goto xfrm_proto_ah_failed;
|
|
err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
|
|
if (err < 0)
|
|
goto xfrm_proto_comp_failed;
|
|
|
|
msg = "netlink interface";
|
|
err = rtnl_link_register(&vti_link_ops);
|
|
if (err < 0)
|
|
goto rtnl_link_failed;
|
|
|
|
return err;
|
|
|
|
rtnl_link_failed:
|
|
xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
|
|
xfrm_proto_comp_failed:
|
|
xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
|
|
xfrm_proto_ah_failed:
|
|
xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
|
|
xfrm_proto_esp_failed:
|
|
unregister_pernet_device(&vti_net_ops);
|
|
pernet_dev_failed:
|
|
pr_err("vti init: failed to register %s\n", msg);
|
|
return err;
|
|
}
|
|
|
|
static void __exit vti_fini(void)
|
|
{
|
|
rtnl_link_unregister(&vti_link_ops);
|
|
xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
|
|
xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
|
|
xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
|
|
unregister_pernet_device(&vti_net_ops);
|
|
}
|
|
|
|
module_init(vti_init);
|
|
module_exit(vti_fini);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_RTNL_LINK("vti");
|
|
MODULE_ALIAS_NETDEV("ip_vti0");
|