This patch contains the reworked EtherIP driver, the necessary header
updates and adds an entry for EtherIP to the MAINTAINERS file.
Signed-off-by: Joerg Roedel <[email protected]>
diff -uprN -X linux-2.6.18-vanilla/Documentation/dontdiff linux-2.6.18-vanilla/include/linux/if_arp.h linux-2.6.18/include/linux/if_arp.h
--- linux-2.6.18-vanilla/include/linux/if_arp.h 2006-09-20 05:42:06.000000000 +0200
+++ linux-2.6.18/include/linux/if_arp.h 2006-09-23 12:50:05.000000000 +0200
@@ -85,6 +85,7 @@
#define ARPHRD_IEEE80211 801 /* IEEE 802.11 */
#define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header */
#define ARPHRD_IEEE80211_RADIOTAP 803 /* IEEE 802.11 + radiotap header */
+#define ARPHRD_ETHERIP 804 /* Ethernet over IPv4 tunnel */
#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */
#define ARPHRD_NONE 0xFFFE /* zero header length */
diff -uprN -X linux-2.6.18-vanilla/Documentation/dontdiff linux-2.6.18-vanilla/include/linux/in.h linux-2.6.18/include/linux/in.h
--- linux-2.6.18-vanilla/include/linux/in.h 2006-09-20 05:42:06.000000000 +0200
+++ linux-2.6.18/include/linux/in.h 2006-09-20 22:52:30.000000000 +0200
@@ -40,6 +40,7 @@ enum {
IPPROTO_ESP = 50, /* Encapsulation Security Payload protocol */
IPPROTO_AH = 51, /* Authentication Header protocol */
+ IPPROTO_ETHERIP = 97, /* Ethernet over IPv4 protocol */
IPPROTO_PIM = 103, /* Protocol Independent Multicast */
IPPROTO_COMP = 108, /* Compression Header protocol */
diff -uprN -X linux-2.6.18-vanilla/Documentation/dontdiff linux-2.6.18-vanilla/net/ipv4/etherip.c linux-2.6.18/net/ipv4/etherip.c
--- linux-2.6.18-vanilla/net/ipv4/etherip.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.18/net/ipv4/etherip.c 2006-09-23 12:52:38.000000000 +0200
@@ -0,0 +1,542 @@
+/*
+ * etherip.c: Ethernet over IPv4 tunnel driver (according to RFC3378)
+ *
+ * This driver could be used to tunnel Ethernet packets through IPv4
+ * networks. This is especially usefull together with the bridging
+ * code in Linux.
+ *
+ * This code was written with an eye on the IPIP driver in linux from
+ * Sam Lantinga. Thanks for the great work.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 (no later version) as published by the
+ * Free Software Foundation.
+ *
+ */
+
+#include <linux/capability.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/if_tunnel.h>
+#include <linux/if_arp.h>
+#include <linux/list.h>
+#include <linux/string.h>
+#include <linux/netfilter_ipv4.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <net/route.h>
+#include <net/ipip.h>
+#include <net/xfrm.h>
+#include <net/inet_ecn.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joerg Roedel <[email protected]>");
+MODULE_DESCRIPTION("Ethernet over IPv4 tunnel driver");
+
+/*
+ * These 2 defines are taken from ipip.c - if it's good enough for them
+ * it's good enough for me.
+ */
+#define HASH_SIZE 16
+#define HASH(addr) ((addr^(addr>>4))&0xF)
+
+#define ETHERIP_HEADER ((u16)0x0300)
+#define ETHERIP_HLEN 2
+
+#define BANNER1 "etherip: Ethernet over IPv4 tunneling driver\n"
+
+struct etherip_tunnel {
+ struct list_head list;
+ struct net_device *dev;
+ struct net_device_stats stats;
+ struct ip_tunnel_parm parms;
+ unsigned int recursion;
+};
+
+static struct net_device *etherip_tunnel_dev;
+static struct list_head tunnels[HASH_SIZE];
+
+static DEFINE_RWLOCK(etherip_lock);
+
+static void etherip_tunnel_setup(struct net_device *dev);
+
+/* add a tunnel to the hash */
+static void etherip_tunnel_add(struct etherip_tunnel *tun)
+{
+ unsigned h = HASH(tun->parms.iph.daddr);
+ list_add_tail(&tun->list, &tunnels[h]);
+}
+
+/* delete a tunnel from the hash*/
+static void etherip_tunnel_del(struct etherip_tunnel *tun)
+{
+ list_del(&tun->list);
+}
+
+/* find a tunnel in the hash by parameters from userspace */
+static struct etherip_tunnel* etherip_tunnel_find(struct ip_tunnel_parm *p)
+{
+ struct etherip_tunnel *ret;
+ unsigned h = HASH(p->iph.daddr);
+
+ list_for_each_entry(ret, &tunnels[h], list)
+ if (ret->parms.iph.daddr == p->iph.daddr)
+ return ret;
+
+ return NULL;
+}
+
+/* find a tunnel by its destination address */
+static struct etherip_tunnel* etherip_tunnel_locate(u32 remote)
+{
+ struct etherip_tunnel *ret;
+ unsigned h = HASH(remote);
+
+ list_for_each_entry(ret, &tunnels[h], list)
+ if (ret->parms.iph.daddr == remote)
+ return ret;
+
+ return NULL;
+}
+
+/* netdevice start function */
+static int etherip_tunnel_open(struct net_device *dev)
+{
+ netif_start_queue(dev);
+ return 0;
+}
+
+/* netdevice stop function */
+static int etherip_tunnel_stop(struct net_device *dev)
+{
+ netif_stop_queue(dev);
+ return 0;
+}
+
+/* netdevice hard_start_xmit function
+ * it gets an Ethernet packet in skb and encapsulates it in another IP
+ * packet */
+static int etherip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct etherip_tunnel *tunnel = netdev_priv(dev);
+ struct rtable *rt;
+ struct iphdr *iph;
+ struct flowi fl;
+ struct net_device *tdev;
+ int max_headroom;
+ struct net_device_stats *stats = &tunnel->stats;
+
+ if (tunnel->recursion++) {
+ tunnel->stats.collisions++;
+ goto tx_error;
+ }
+
+ memset(&fl, 0, sizeof(fl));
+ fl.oif = tunnel->parms.link;
+ fl.proto = IPPROTO_ETHERIP;
+ fl.nl_u.ip4_u.daddr = tunnel->parms.iph.daddr;
+ fl.nl_u.ip4_u.saddr = tunnel->parms.iph.saddr;
+
+ if (ip_route_output_key(&rt, &fl)) {
+ tunnel->stats.tx_carrier_errors++;
+ goto tx_error_icmp;
+ }
+
+ tdev = rt->u.dst.dev;
+ if (tdev == dev) {
+ ip_rt_put(rt);
+ tunnel->stats.collisions++;
+ goto tx_error;
+ }
+
+ max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)
+ + ETHERIP_HLEN);
+
+ if (skb_headroom(skb) < max_headroom || skb_cloned(skb)
+ || skb_shared(skb)) {
+ struct sk_buff *skn = skb_realloc_headroom(skb, max_headroom);
+ if (!skn) {
+ ip_rt_put(rt);
+ dev_kfree_skb(skb);
+ tunnel->stats.tx_dropped++;
+ return 0;
+ }
+ if (skb->sk)
+ skb_set_owner_w(skn, skb->sk);
+ dev_kfree_skb(skb);
+ skb = skn;
+ }
+
+ skb->h.raw = skb->nh.raw;
+ skb->nh.raw = skb_push(skb, sizeof(struct iphdr)+ETHERIP_HLEN);
+ memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
+ IPSKB_REROUTED);
+ if (skb->dst)
+ skb->dst->ops->update_pmtu(skb->dst, dev->mtu);
+
+ dst_release(skb->dst);
+ skb->dst = &rt->u.dst;
+
+ /* Build the IP header for the outgoing packet
+ *
+ * Note: This driver never sets the DF flag on outgoing packets
+ * to ensure that the tunnel provides the full Ethernet MTU.
+ * This behavior guarantees that protocols can be
+ * encapsulated within the Ethernet packet which do not
+ * know the concept of a path MTU
+ */
+ iph = skb->nh.iph;
+ iph->version = 4;
+ iph->ihl = sizeof(struct iphdr)>>2;
+ iph->frag_off = 0;
+ iph->protocol = IPPROTO_ETHERIP;
+ iph->tos = tunnel->parms.iph.tos & INET_ECN_MASK;
+ iph->daddr = rt->rt_dst;
+ iph->saddr = rt->rt_src;
+ iph->ttl = tunnel->parms.iph.ttl;
+ if (iph->ttl == 0)
+ iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT);
+
+ /* add the 16bit etherip header after the ip header */
+ *((u16*)(skb->nh.raw + sizeof(struct iphdr))) = ntohs(ETHERIP_HEADER);
+ nf_reset(skb);
+ IPTUNNEL_XMIT();
+ tunnel->dev->trans_start = jiffies;
+ tunnel->recursion--;
+
+ return 0;
+
+tx_error_icmp:
+ dst_link_failure(skb);
+
+tx_error:
+ tunnel->stats.tx_errors++;
+ dev_kfree_skb(skb);
+ tunnel->recursion--;
+ return 0;
+}
+
+/* get statistics callback */
+static struct net_device_stats *etherip_tunnel_stats(struct net_device *dev)
+{
+ struct etherip_tunnel *ethip = netdev_priv(dev);
+ return ðip->stats;
+}
+
+/* checks parameters the driver gets from userspace */
+static int etherip_param_check(struct ip_tunnel_parm *p)
+{
+ if (p->iph.version != 4 ||
+ p->iph.protocol != IPPROTO_ETHERIP ||
+ p->iph.ihl != 5 ||
+ p->iph.daddr == INADDR_ANY ||
+ MULTICAST(p->iph.daddr))
+ return -EINVAL;
+
+ return 0;
+}
+
+/* central ioctl function for all netdevices this driver manages
+ * it allows to create, delete, modify a tunnel and fetch tunnel
+ * information */
+static int etherip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr,
+ int cmd)
+{
+ int err = 0;
+ struct ip_tunnel_parm p;
+ struct net_device *tmp_dev;
+ char *dev_name;
+ struct etherip_tunnel *t;
+
+
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+ t = netdev_priv(dev);
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms,
+ sizeof(t->parms)))
+ err = -EFAULT;
+ break;
+ case SIOCADDTUNNEL:
+ err = -EINVAL;
+ if (dev != etherip_tunnel_dev)
+ goto out;
+
+ case SIOCCHGTUNNEL:
+ err = -EPERM;
+ if (!capable(CAP_NET_ADMIN))
+ goto out;
+
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
+ sizeof(p)))
+ goto out;
+ p.i_flags = p.o_flags = 0;
+
+ if ((err = etherip_param_check(&p)) < 0)
+ goto out;
+
+ t = etherip_tunnel_find(&p);
+
+ err = -EEXIST;
+ if (t != NULL && t->dev != dev)
+ goto out;
+
+ if (cmd == SIOCADDTUNNEL) {
+
+ p.name[IFNAMSIZ-1] = 0;
+ dev_name = p.name;
+ if (dev_name[0] == 0)
+ dev_name = "ethip%d";
+
+ err = -ENOMEM;
+ tmp_dev = alloc_netdev(
+ sizeof(struct etherip_tunnel),
+ dev_name,
+ etherip_tunnel_setup);
+
+ if (tmp_dev == NULL)
+ goto out;
+
+ if (strchr(tmp_dev->name, '%')) {
+ err = dev_alloc_name(tmp_dev, tmp_dev->name);
+ if (err < 0)
+ goto add_err;
+ }
+
+ t = netdev_priv(tmp_dev);
+ t->dev = tmp_dev;
+ strncpy(p.name, tmp_dev->name, IFNAMSIZ);
+ memcpy(&(t->parms), &p, sizeof(p));
+
+ err = -EFAULT;
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
+ sizeof(p)))
+ goto add_err;
+
+ err = register_netdevice(tmp_dev);
+ if (err < 0)
+ goto add_err;
+
+ write_lock_bh(ðerip_lock);
+ etherip_tunnel_add(t);
+ write_unlock_bh(ðerip_lock);
+
+ } else {
+ err = -EINVAL;
+ if ((t = netdev_priv(dev)) == NULL)
+ goto out;
+ if (dev == etherip_tunnel_dev)
+ goto out;
+ write_lock_bh(ðerip_lock);
+ memcpy(&(t->parms), &p, sizeof(p));
+ write_unlock_bh(ðerip_lock);
+ }
+
+ err = 0;
+ break;
+add_err:
+ free_netdev(tmp_dev);
+ goto out;
+
+ case SIOCDELTUNNEL:
+ err = -EPERM;
+ if (!capable(CAP_NET_ADMIN))
+ goto out;
+
+ err = -EFAULT;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
+ sizeof(p)))
+ goto out;
+
+ err = -EINVAL;
+ if (dev == etherip_tunnel_dev) {
+ t = etherip_tunnel_find(&p);
+ if (t == NULL) {
+ goto out;
+ }
+ } else
+ t = netdev_priv(dev);
+
+ write_lock_bh(ðerip_lock);
+ etherip_tunnel_del(t);
+ write_unlock_bh(ðerip_lock);
+
+ unregister_netdevice(t->dev);
+ err = 0;
+
+ break;
+ default:
+ err = -EINVAL;
+ }
+
+out:
+ return err;
+}
+
+/* device init function - called via register_netdevice
+ * The tunnel is registered as an Ethernet device. This allows
+ * the tunnel to be added to a bridge */
+static void etherip_tunnel_setup(struct net_device *dev)
+{
+ SET_MODULE_OWNER(dev);
+ dev->open = etherip_tunnel_open;
+ dev->hard_start_xmit = etherip_tunnel_xmit;
+ dev->stop = etherip_tunnel_stop;
+ dev->get_stats = etherip_tunnel_stats;
+ dev->do_ioctl = etherip_tunnel_ioctl;
+ dev->destructor = free_netdev;
+
+ ether_setup(dev);
+ dev->type = ARPHRD_ETHERIP;
+ dev->tx_queue_len = 0;
+ random_ether_addr(dev->dev_addr);
+}
+
+/* receive function for EtherIP packets
+ * Does some basic checks on the MAC addresses and
+ * interface modes */
+static int etherip_rcv(struct sk_buff *skb)
+{
+ struct iphdr *iph;
+ struct ethhdr *ehdr;
+ struct etherip_tunnel *tunnel;
+ struct net_device *dev;
+
+ iph = skb->nh.iph;
+
+ read_lock_bh(ðerip_lock);
+ tunnel = etherip_tunnel_locate(iph->saddr);
+ if (tunnel == NULL)
+ goto drop;
+
+ dev = tunnel->dev;
+ secpath_reset(skb);
+ memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
+ skb_pull(skb, (skb->nh.raw - skb->data)
+ + sizeof(struct iphdr) + ETHERIP_HLEN);
+ ehdr = (struct ethhdr*)skb->data;
+ skb->dev = dev;
+ skb->pkt_type = PACKET_HOST;
+ skb->protocol = eth_type_trans(skb, tunnel->dev);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ dst_release(skb->dst);
+ skb->dst = NULL;
+
+ /* do some checks */
+ if (skb->pkt_type == PACKET_HOST || skb->pkt_type == PACKET_BROADCAST)
+ goto accept;
+
+ if (skb->pkt_type == PACKET_MULTICAST &&
+ (dev->mc_count > 0 || dev->flags & IFF_ALLMULTI))
+ goto accept;
+
+ if (skb->pkt_type == PACKET_OTHERHOST && dev->flags & IFF_PROMISC)
+ goto accept;
+
+ goto drop;
+
+accept:
+ tunnel->dev->last_rx = jiffies;
+ tunnel->stats.rx_packets++;
+ tunnel->stats.rx_bytes += skb->len;
+ nf_reset(skb);
+ netif_rx(skb);
+ read_unlock_bh(ðerip_lock);
+ return 0;
+
+drop:
+ read_unlock_bh(ðerip_lock);
+ kfree_skb(skb);
+ return 0;
+}
+
+static struct net_protocol etherip_protocol = {
+ .handler = etherip_rcv,
+ .err_handler = 0,
+ .no_policy = 0,
+};
+
+/* module init function
+ * initializes the EtherIP protocol (97) and registers the initial
+ * device */
+static int __init etherip_init(void)
+{
+ int err, i;
+ struct etherip_tunnel *p;
+
+ printk(KERN_INFO BANNER1);
+
+ for (i = 0; i < HASH_SIZE; ++i)
+ INIT_LIST_HEAD(&tunnels[i]);
+
+ if (inet_add_protocol(ðerip_protocol, IPPROTO_ETHERIP)) {
+ printk(KERN_ERR "etherip: can't add protocol\n");
+ return -EAGAIN;
+ }
+
+ etherip_tunnel_dev = alloc_netdev(sizeof(struct etherip_tunnel),
+ "ethip0",
+ etherip_tunnel_setup);
+
+ if (!etherip_tunnel_dev) {
+ err = -ENOMEM;
+ goto err2;
+ }
+
+ p = netdev_priv(etherip_tunnel_dev);
+ p->dev = etherip_tunnel_dev;
+ /* set some params for iproute2 */
+ strcpy(p->parms.name, "ethip0");
+ p->parms.iph.protocol = IPPROTO_ETHERIP;
+
+ if ((err = register_netdev(etherip_tunnel_dev)))
+ goto err1;
+
+out:
+ return err;
+err1:
+ free_netdev(etherip_tunnel_dev);
+err2:
+ inet_del_protocol(ðerip_protocol, IPPROTO_ETHERIP);
+ goto out;
+}
+
+/* destroy all tunnels */
+static void __exit etherip_destroy_tunnels(void)
+{
+ int i;
+ struct list_head *ptr;
+ struct etherip_tunnel *tun;
+
+ for (i = 0; i < HASH_SIZE; ++i) {
+ list_for_each(ptr, &tunnels[i]) {
+ tun = list_entry(ptr, struct etherip_tunnel, list);
+ ptr = ptr->prev;
+ etherip_tunnel_del(tun);
+ unregister_netdevice(tun->dev);
+ }
+ }
+}
+
+/* module cleanup function */
+static void __exit etherip_exit(void)
+{
+ rtnl_lock();
+ etherip_destroy_tunnels();
+ unregister_netdevice(etherip_tunnel_dev);
+ rtnl_unlock();
+ if (inet_del_protocol(ðerip_protocol, IPPROTO_ETHERIP))
+ printk(KERN_ERR "etherip: can't remove protocol\n");
+}
+
+module_init(etherip_init);
+module_exit(etherip_exit);
diff -uprN -X linux-2.6.18-vanilla/Documentation/dontdiff linux-2.6.18-vanilla/net/ipv4/Kconfig linux-2.6.18/net/ipv4/Kconfig
--- linux-2.6.18-vanilla/net/ipv4/Kconfig 2006-09-20 05:42:06.000000000 +0200
+++ linux-2.6.18/net/ipv4/Kconfig 2006-09-23 13:02:18.000000000 +0200
@@ -272,6 +272,19 @@ config NET_IPGRE_BROADCAST
Network), but can be distributed all over the Internet. If you want
to do that, say Y here and to "IP multicast routing" below.
+config NET_ETHERIP
+ tristate "IP: Ethernet over IP tunneling (experimental)"
+ help
+ Tunneling means encapsulating data of one protocol type within
+ another protocol and sending it over a channel that understands the
+ encapsulating protocol. This tunnel driver implements the
+ encapsulation of Ethernet frames into IP packets using the EtherIP
+ protocol defined in RFC 3378. This is especially usefull together with
+ the bridging code to build distributed OSI Layer 2 networks.
+
+ You can build this driver as a module. The module will be called
+ etherip.ko. If unsure, say N.
+
config IP_MROUTE
bool "IP: multicast routing"
depends on IP_MULTICAST
diff -uprN -X linux-2.6.18-vanilla/Documentation/dontdiff linux-2.6.18-vanilla/net/ipv4/Makefile linux-2.6.18/net/ipv4/Makefile
--- linux-2.6.18-vanilla/net/ipv4/Makefile 2006-09-20 05:42:06.000000000 +0200
+++ linux-2.6.18/net/ipv4/Makefile 2006-09-20 22:52:30.000000000 +0200
@@ -17,6 +17,7 @@ obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_IP_MULTIPLE_TABLES) += fib_rules.o
obj-$(CONFIG_IP_MROUTE) += ipmr.o
obj-$(CONFIG_NET_IPIP) += ipip.o
+obj-$(CONFIG_NET_ETHERIP) += etherip.o
obj-$(CONFIG_NET_IPGRE) += ip_gre.o
obj-$(CONFIG_SYN_COOKIES) += syncookies.o
obj-$(CONFIG_INET_AH) += ah4.o
--- linux-2.6.18-vanilla/MAINTAINERS 2006-09-20 05:42:06.000000000 +0200
+++ linux-2.6.18/MAINTAINERS 2006-09-23 12:41:09.000000000 +0200
@@ -1016,6 +1016,11 @@ M: [email protected]
L: [email protected]
S: Maintained
+ETHERIP TUNNEL DRIVER
+P: Joerg Roedel
+M: [email protected]
+S: Maintained
+
ETHERNET BRIDGE
P: Stephen Hemminger
M: [email protected]
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