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author | Srikant Patnaik | 2015-01-13 15:08:24 +0530 |
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committer | Srikant Patnaik | 2015-01-13 15:08:24 +0530 |
commit | 97327692361306d1e6259021bc425e32832fdb50 (patch) | |
tree | fe9088f3248ec61e24f404f21b9793cb644b7f01 /net/ipv4/ipip.c | |
parent | 2d05a8f663478a44e088d122e0d62109bbc801d0 (diff) | |
parent | a3a8b90b61e21be3dde9101c4e86c881e0f06210 (diff) | |
download | FOSSEE-netbook-kernel-source-97327692361306d1e6259021bc425e32832fdb50.tar.gz FOSSEE-netbook-kernel-source-97327692361306d1e6259021bc425e32832fdb50.tar.bz2 FOSSEE-netbook-kernel-source-97327692361306d1e6259021bc425e32832fdb50.zip |
dirty fix to merging
Diffstat (limited to 'net/ipv4/ipip.c')
-rw-r--r-- | net/ipv4/ipip.c | 911 |
1 files changed, 911 insertions, 0 deletions
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c new file mode 100644 index 00000000..ae1413e3 --- /dev/null +++ b/net/ipv4/ipip.c @@ -0,0 +1,911 @@ +/* + * Linux NET3: IP/IP protocol decoder. + * + * Authors: + * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 + * + * Fixes: + * Alan Cox : Merged and made usable non modular (its so tiny its silly as + * a module taking up 2 pages). + * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) + * to keep ip_forward happy. + * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). + * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL + * David Woodhouse : Perform some basic ICMP handling. + * IPIP Routing without decapsulation. + * Carlos Picoto : GRE over IP support + * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c. + * I do not want to merge them together. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + */ + +/* tunnel.c: an IP tunnel driver + + The purpose of this driver is to provide an IP tunnel through + which you can tunnel network traffic transparently across subnets. + + This was written by looking at Nick Holloway's dummy driver + Thanks for the great code! + + -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 + + Minor tweaks: + Cleaned up the code a little and added some pre-1.3.0 tweaks. + dev->hard_header/hard_header_len changed to use no headers. + Comments/bracketing tweaked. + Made the tunnels use dev->name not tunnel: when error reporting. + Added tx_dropped stat + + -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95 + + Reworked: + Changed to tunnel to destination gateway in addition to the + tunnel's pointopoint address + Almost completely rewritten + Note: There is currently no firewall or ICMP handling done. + + -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96 + +*/ + +/* Things I wish I had known when writing the tunnel driver: + + When the tunnel_xmit() function is called, the skb contains the + packet to be sent (plus a great deal of extra info), and dev + contains the tunnel device that _we_ are. + + When we are passed a packet, we are expected to fill in the + source address with our source IP address. + + What is the proper way to allocate, copy and free a buffer? + After you allocate it, it is a "0 length" chunk of memory + starting at zero. If you want to add headers to the buffer + later, you'll have to call "skb_reserve(skb, amount)" with + the amount of memory you want reserved. Then, you call + "skb_put(skb, amount)" with the amount of space you want in + the buffer. skb_put() returns a pointer to the top (#0) of + that buffer. skb->len is set to the amount of space you have + "allocated" with skb_put(). You can then write up to skb->len + bytes to that buffer. If you need more, you can call skb_put() + again with the additional amount of space you need. You can + find out how much more space you can allocate by calling + "skb_tailroom(skb)". + Now, to add header space, call "skb_push(skb, header_len)". + This creates space at the beginning of the buffer and returns + a pointer to this new space. If later you need to strip a + header from a buffer, call "skb_pull(skb, header_len)". + skb_headroom() will return how much space is left at the top + of the buffer (before the main data). Remember, this headroom + space must be reserved before the skb_put() function is called. + */ + +/* + This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c + + For comments look at net/ipv4/ip_gre.c --ANK + */ + + +#include <linux/capability.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <asm/uaccess.h> +#include <linux/skbuff.h> +#include <linux/netdevice.h> +#include <linux/in.h> +#include <linux/tcp.h> +#include <linux/udp.h> +#include <linux/if_arp.h> +#include <linux/mroute.h> +#include <linux/init.h> +#include <linux/netfilter_ipv4.h> +#include <linux/if_ether.h> + +#include <net/sock.h> +#include <net/ip.h> +#include <net/icmp.h> +#include <net/ipip.h> +#include <net/inet_ecn.h> +#include <net/xfrm.h> +#include <net/net_namespace.h> +#include <net/netns/generic.h> + +#define HASH_SIZE 16 +#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) + +static int ipip_net_id __read_mostly; +struct ipip_net { + struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; + struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; + struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; + struct ip_tunnel __rcu *tunnels_wc[1]; + struct ip_tunnel __rcu **tunnels[4]; + + struct net_device *fb_tunnel_dev; +}; + +static int ipip_tunnel_init(struct net_device *dev); +static void ipip_tunnel_setup(struct net_device *dev); +static void ipip_dev_free(struct net_device *dev); + +/* + * Locking : hash tables are protected by RCU and RTNL + */ + +#define for_each_ip_tunnel_rcu(start) \ + for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) + +/* often modified stats are per cpu, other are shared (netdev->stats) */ +struct pcpu_tstats { + unsigned long rx_packets; + unsigned long rx_bytes; + unsigned long tx_packets; + unsigned long tx_bytes; +} __attribute__((aligned(4*sizeof(unsigned long)))); + +static struct net_device_stats *ipip_get_stats(struct net_device *dev) +{ + struct pcpu_tstats sum = { 0 }; + int i; + + for_each_possible_cpu(i) { + const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); + + sum.rx_packets += tstats->rx_packets; + sum.rx_bytes += tstats->rx_bytes; + sum.tx_packets += tstats->tx_packets; + sum.tx_bytes += tstats->tx_bytes; + } + dev->stats.rx_packets = sum.rx_packets; + dev->stats.rx_bytes = sum.rx_bytes; + dev->stats.tx_packets = sum.tx_packets; + dev->stats.tx_bytes = sum.tx_bytes; + return &dev->stats; +} + +static struct ip_tunnel * ipip_tunnel_lookup(struct net *net, + __be32 remote, __be32 local) +{ + unsigned int h0 = HASH(remote); + unsigned int h1 = HASH(local); + struct ip_tunnel *t; + struct ipip_net *ipn = net_generic(net, ipip_net_id); + + for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1]) + if (local == t->parms.iph.saddr && + remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) + return t; + + for_each_ip_tunnel_rcu(ipn->tunnels_r[h0]) + if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) + return t; + + for_each_ip_tunnel_rcu(ipn->tunnels_l[h1]) + if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) + return t; + + t = rcu_dereference(ipn->tunnels_wc[0]); + if (t && (t->dev->flags&IFF_UP)) + return t; + return NULL; +} + +static struct ip_tunnel __rcu **__ipip_bucket(struct ipip_net *ipn, + struct ip_tunnel_parm *parms) +{ + __be32 remote = parms->iph.daddr; + __be32 local = parms->iph.saddr; + unsigned int h = 0; + int prio = 0; + + if (remote) { + prio |= 2; + h ^= HASH(remote); + } + if (local) { + prio |= 1; + h ^= HASH(local); + } + return &ipn->tunnels[prio][h]; +} + +static inline struct ip_tunnel __rcu **ipip_bucket(struct ipip_net *ipn, + struct ip_tunnel *t) +{ + return __ipip_bucket(ipn, &t->parms); +} + +static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t) +{ + struct ip_tunnel __rcu **tp; + struct ip_tunnel *iter; + + for (tp = ipip_bucket(ipn, t); + (iter = rtnl_dereference(*tp)) != NULL; + tp = &iter->next) { + if (t == iter) { + rcu_assign_pointer(*tp, t->next); + break; + } + } +} + +static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) +{ + struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t); + + rcu_assign_pointer(t->next, rtnl_dereference(*tp)); + rcu_assign_pointer(*tp, t); +} + +static struct ip_tunnel * ipip_tunnel_locate(struct net *net, + struct ip_tunnel_parm *parms, int create) +{ + __be32 remote = parms->iph.daddr; + __be32 local = parms->iph.saddr; + struct ip_tunnel *t, *nt; + struct ip_tunnel __rcu **tp; + struct net_device *dev; + char name[IFNAMSIZ]; + struct ipip_net *ipn = net_generic(net, ipip_net_id); + + for (tp = __ipip_bucket(ipn, parms); + (t = rtnl_dereference(*tp)) != NULL; + tp = &t->next) { + if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) + return t; + } + if (!create) + return NULL; + + if (parms->name[0]) + strlcpy(name, parms->name, IFNAMSIZ); + else + strcpy(name, "tunl%d"); + + dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup); + if (dev == NULL) + return NULL; + + dev_net_set(dev, net); + + nt = netdev_priv(dev); + nt->parms = *parms; + + if (ipip_tunnel_init(dev) < 0) + goto failed_free; + + if (register_netdevice(dev) < 0) + goto failed_free; + + strcpy(nt->parms.name, dev->name); + + dev_hold(dev); + ipip_tunnel_link(ipn, nt); + return nt; + +failed_free: + ipip_dev_free(dev); + return NULL; +} + +/* called with RTNL */ +static void ipip_tunnel_uninit(struct net_device *dev) +{ + struct net *net = dev_net(dev); + struct ipip_net *ipn = net_generic(net, ipip_net_id); + + if (dev == ipn->fb_tunnel_dev) + RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL); + else + ipip_tunnel_unlink(ipn, netdev_priv(dev)); + dev_put(dev); +} + +static int ipip_err(struct sk_buff *skb, u32 info) +{ + +/* All the routers (except for Linux) return only + 8 bytes of packet payload. It means, that precise relaying of + ICMP in the real Internet is absolutely infeasible. + */ + const struct iphdr *iph = (const struct iphdr *)skb->data; + const int type = icmp_hdr(skb)->type; + const int code = icmp_hdr(skb)->code; + struct ip_tunnel *t; + int err; + + switch (type) { + default: + case ICMP_PARAMETERPROB: + return 0; + + case ICMP_DEST_UNREACH: + switch (code) { + case ICMP_SR_FAILED: + case ICMP_PORT_UNREACH: + /* Impossible event. */ + return 0; + case ICMP_FRAG_NEEDED: + /* Soft state for pmtu is maintained by IP core. */ + return 0; + default: + /* All others are translated to HOST_UNREACH. + rfc2003 contains "deep thoughts" about NET_UNREACH, + I believe they are just ether pollution. --ANK + */ + break; + } + break; + case ICMP_TIME_EXCEEDED: + if (code != ICMP_EXC_TTL) + return 0; + break; + } + + err = -ENOENT; + + rcu_read_lock(); + t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); + if (t == NULL || t->parms.iph.daddr == 0) + goto out; + + err = 0; + if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) + goto out; + + if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) + t->err_count++; + else + t->err_count = 1; + t->err_time = jiffies; +out: + rcu_read_unlock(); + return err; +} + +static inline void ipip_ecn_decapsulate(const struct iphdr *outer_iph, + struct sk_buff *skb) +{ + struct iphdr *inner_iph = ip_hdr(skb); + + if (INET_ECN_is_ce(outer_iph->tos)) + IP_ECN_set_ce(inner_iph); +} + +static int ipip_rcv(struct sk_buff *skb) +{ + struct ip_tunnel *tunnel; + const struct iphdr *iph = ip_hdr(skb); + + rcu_read_lock(); + tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr); + if (tunnel != NULL) { + struct pcpu_tstats *tstats; + + if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { + rcu_read_unlock(); + kfree_skb(skb); + return 0; + } + + secpath_reset(skb); + + skb->mac_header = skb->network_header; + skb_reset_network_header(skb); + skb->protocol = htons(ETH_P_IP); + skb->pkt_type = PACKET_HOST; + + tstats = this_cpu_ptr(tunnel->dev->tstats); + tstats->rx_packets++; + tstats->rx_bytes += skb->len; + + __skb_tunnel_rx(skb, tunnel->dev); + + ipip_ecn_decapsulate(iph, skb); + + netif_rx(skb); + + rcu_read_unlock(); + return 0; + } + rcu_read_unlock(); + + return -1; +} + +/* + * This function assumes it is being called from dev_queue_xmit() + * and that skb is filled properly by that function. + */ + +static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ip_tunnel *tunnel = netdev_priv(dev); + struct pcpu_tstats *tstats; + const struct iphdr *tiph = &tunnel->parms.iph; + u8 tos = tunnel->parms.iph.tos; + __be16 df = tiph->frag_off; + struct rtable *rt; /* Route to the other host */ + struct net_device *tdev; /* Device to other host */ + const struct iphdr *old_iph = ip_hdr(skb); + struct iphdr *iph; /* Our new IP header */ + unsigned int max_headroom; /* The extra header space needed */ + __be32 dst = tiph->daddr; + struct flowi4 fl4; + int mtu; + + if (skb->protocol != htons(ETH_P_IP)) + goto tx_error; + + if (tos & 1) + tos = old_iph->tos; + + if (!dst) { + /* NBMA tunnel */ + if ((rt = skb_rtable(skb)) == NULL) { + dev->stats.tx_fifo_errors++; + goto tx_error; + } + dst = rt->rt_gateway; + } + + rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, + dst, tiph->saddr, + 0, 0, + IPPROTO_IPIP, RT_TOS(tos), + tunnel->parms.link); + if (IS_ERR(rt)) { + dev->stats.tx_carrier_errors++; + goto tx_error_icmp; + } + tdev = rt->dst.dev; + + if (tdev == dev) { + ip_rt_put(rt); + dev->stats.collisions++; + goto tx_error; + } + + df |= old_iph->frag_off & htons(IP_DF); + + if (df) { + mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); + + if (mtu < 68) { + dev->stats.collisions++; + ip_rt_put(rt); + goto tx_error; + } + + if (skb_dst(skb)) + skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); + + if ((old_iph->frag_off & htons(IP_DF)) && + mtu < ntohs(old_iph->tot_len)) { + icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, + htonl(mtu)); + ip_rt_put(rt); + goto tx_error; + } + } + + if (tunnel->err_count > 0) { + if (time_before(jiffies, + tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { + tunnel->err_count--; + dst_link_failure(skb); + } else + tunnel->err_count = 0; + } + + /* + * Okay, now see if we can stuff it in the buffer as-is. + */ + max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); + + if (skb_headroom(skb) < max_headroom || skb_shared(skb) || + (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { + struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); + if (!new_skb) { + ip_rt_put(rt); + dev->stats.tx_dropped++; + dev_kfree_skb(skb); + return NETDEV_TX_OK; + } + if (skb->sk) + skb_set_owner_w(new_skb, skb->sk); + dev_kfree_skb(skb); + skb = new_skb; + old_iph = ip_hdr(skb); + } + + skb->transport_header = skb->network_header; + skb_push(skb, sizeof(struct iphdr)); + skb_reset_network_header(skb); + memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); + IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | + IPSKB_REROUTED); + skb_dst_drop(skb); + skb_dst_set(skb, &rt->dst); + + /* + * Push down and install the IPIP header. + */ + + iph = ip_hdr(skb); + iph->version = 4; + iph->ihl = sizeof(struct iphdr)>>2; + iph->frag_off = df; + iph->protocol = IPPROTO_IPIP; + iph->tos = INET_ECN_encapsulate(tos, old_iph->tos); + iph->daddr = fl4.daddr; + iph->saddr = fl4.saddr; + + if ((iph->ttl = tiph->ttl) == 0) + iph->ttl = old_iph->ttl; + + nf_reset(skb); + tstats = this_cpu_ptr(dev->tstats); + __IPTUNNEL_XMIT(tstats, &dev->stats); + return NETDEV_TX_OK; + +tx_error_icmp: + dst_link_failure(skb); +tx_error: + dev->stats.tx_errors++; + dev_kfree_skb(skb); + return NETDEV_TX_OK; +} + +static void ipip_tunnel_bind_dev(struct net_device *dev) +{ + struct net_device *tdev = NULL; + struct ip_tunnel *tunnel; + const struct iphdr *iph; + + tunnel = netdev_priv(dev); + iph = &tunnel->parms.iph; + + if (iph->daddr) { + struct rtable *rt; + struct flowi4 fl4; + + rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, + iph->daddr, iph->saddr, + 0, 0, + IPPROTO_IPIP, + RT_TOS(iph->tos), + tunnel->parms.link); + if (!IS_ERR(rt)) { + tdev = rt->dst.dev; + ip_rt_put(rt); + } + dev->flags |= IFF_POINTOPOINT; + } + + if (!tdev && tunnel->parms.link) + tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); + + if (tdev) { + dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); + dev->mtu = tdev->mtu - sizeof(struct iphdr); + } + dev->iflink = tunnel->parms.link; +} + +static int +ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) +{ + int err = 0; + struct ip_tunnel_parm p; + struct ip_tunnel *t; + struct net *net = dev_net(dev); + struct ipip_net *ipn = net_generic(net, ipip_net_id); + + switch (cmd) { + case SIOCGETTUNNEL: + t = NULL; + if (dev == ipn->fb_tunnel_dev) { + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { + err = -EFAULT; + break; + } + t = ipip_tunnel_locate(net, &p, 0); + } + if (t == NULL) + t = netdev_priv(dev); + memcpy(&p, &t->parms, sizeof(p)); + if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) + err = -EFAULT; + break; + + case SIOCADDTUNNEL: + case SIOCCHGTUNNEL: + err = -EPERM; + if (!capable(CAP_NET_ADMIN)) + goto done; + + err = -EFAULT; + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) + goto done; + + err = -EINVAL; + if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || + p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) + goto done; + if (p.iph.ttl) + p.iph.frag_off |= htons(IP_DF); + + t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); + + if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { + if (t != NULL) { + if (t->dev != dev) { + err = -EEXIST; + break; + } + } else { + if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || + (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { + err = -EINVAL; + break; + } + t = netdev_priv(dev); + ipip_tunnel_unlink(ipn, t); + synchronize_net(); + t->parms.iph.saddr = p.iph.saddr; + t->parms.iph.daddr = p.iph.daddr; + memcpy(dev->dev_addr, &p.iph.saddr, 4); + memcpy(dev->broadcast, &p.iph.daddr, 4); + ipip_tunnel_link(ipn, t); + netdev_state_change(dev); + } + } + + if (t) { + err = 0; + if (cmd == SIOCCHGTUNNEL) { + t->parms.iph.ttl = p.iph.ttl; + t->parms.iph.tos = p.iph.tos; + t->parms.iph.frag_off = p.iph.frag_off; + if (t->parms.link != p.link) { + t->parms.link = p.link; + ipip_tunnel_bind_dev(dev); + netdev_state_change(dev); + } + } + if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) + err = -EFAULT; + } else + err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); + break; + + case SIOCDELTUNNEL: + err = -EPERM; + if (!capable(CAP_NET_ADMIN)) + goto done; + + if (dev == ipn->fb_tunnel_dev) { + err = -EFAULT; + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) + goto done; + err = -ENOENT; + if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL) + goto done; + err = -EPERM; + if (t->dev == ipn->fb_tunnel_dev) + goto done; + dev = t->dev; + } + unregister_netdevice(dev); + err = 0; + break; + + default: + err = -EINVAL; + } + +done: + return err; +} + +static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu) +{ + if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr)) + return -EINVAL; + dev->mtu = new_mtu; + return 0; +} + +static const struct net_device_ops ipip_netdev_ops = { + .ndo_uninit = ipip_tunnel_uninit, + .ndo_start_xmit = ipip_tunnel_xmit, + .ndo_do_ioctl = ipip_tunnel_ioctl, + .ndo_change_mtu = ipip_tunnel_change_mtu, + .ndo_get_stats = ipip_get_stats, +}; + +static void ipip_dev_free(struct net_device *dev) +{ + free_percpu(dev->tstats); + free_netdev(dev); +} + +static void ipip_tunnel_setup(struct net_device *dev) +{ + dev->netdev_ops = &ipip_netdev_ops; + dev->destructor = ipip_dev_free; + + dev->type = ARPHRD_TUNNEL; + dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); + dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); + dev->flags = IFF_NOARP; + dev->iflink = 0; + dev->addr_len = 4; + dev->features |= NETIF_F_NETNS_LOCAL; + dev->features |= NETIF_F_LLTX; + dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; +} + +static int ipip_tunnel_init(struct net_device *dev) +{ + struct ip_tunnel *tunnel = netdev_priv(dev); + + tunnel->dev = dev; + + memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); + memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); + + ipip_tunnel_bind_dev(dev); + + dev->tstats = alloc_percpu(struct pcpu_tstats); + if (!dev->tstats) + return -ENOMEM; + + return 0; +} + +static int __net_init ipip_fb_tunnel_init(struct net_device *dev) +{ + struct ip_tunnel *tunnel = netdev_priv(dev); + struct iphdr *iph = &tunnel->parms.iph; + struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id); + + tunnel->dev = dev; + strcpy(tunnel->parms.name, dev->name); + + iph->version = 4; + iph->protocol = IPPROTO_IPIP; + iph->ihl = 5; + + dev->tstats = alloc_percpu(struct pcpu_tstats); + if (!dev->tstats) + return -ENOMEM; + + dev_hold(dev); + rcu_assign_pointer(ipn->tunnels_wc[0], tunnel); + return 0; +} + +static struct xfrm_tunnel ipip_handler __read_mostly = { + .handler = ipip_rcv, + .err_handler = ipip_err, + .priority = 1, +}; + +static const char banner[] __initconst = + KERN_INFO "IPv4 over IPv4 tunneling driver\n"; + +static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head) +{ + int prio; + + for (prio = 1; prio < 4; prio++) { + int h; + for (h = 0; h < HASH_SIZE; h++) { + struct ip_tunnel *t; + + t = rtnl_dereference(ipn->tunnels[prio][h]); + while (t != NULL) { + unregister_netdevice_queue(t->dev, head); + t = rtnl_dereference(t->next); + } + } + } +} + +static int __net_init ipip_init_net(struct net *net) +{ + struct ipip_net *ipn = net_generic(net, ipip_net_id); + struct ip_tunnel *t; + int err; + + ipn->tunnels[0] = ipn->tunnels_wc; + ipn->tunnels[1] = ipn->tunnels_l; + ipn->tunnels[2] = ipn->tunnels_r; + ipn->tunnels[3] = ipn->tunnels_r_l; + + ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), + "tunl0", + ipip_tunnel_setup); + if (!ipn->fb_tunnel_dev) { + err = -ENOMEM; + goto err_alloc_dev; + } + dev_net_set(ipn->fb_tunnel_dev, net); + + err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev); + if (err) + goto err_reg_dev; + + if ((err = register_netdev(ipn->fb_tunnel_dev))) + goto err_reg_dev; + + t = netdev_priv(ipn->fb_tunnel_dev); + + strcpy(t->parms.name, ipn->fb_tunnel_dev->name); + return 0; + +err_reg_dev: + ipip_dev_free(ipn->fb_tunnel_dev); +err_alloc_dev: + /* nothing */ + return err; +} + +static void __net_exit ipip_exit_net(struct net *net) +{ + struct ipip_net *ipn = net_generic(net, ipip_net_id); + LIST_HEAD(list); + + rtnl_lock(); + ipip_destroy_tunnels(ipn, &list); + unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); + unregister_netdevice_many(&list); + rtnl_unlock(); +} + +static struct pernet_operations ipip_net_ops = { + .init = ipip_init_net, + .exit = ipip_exit_net, + .id = &ipip_net_id, + .size = sizeof(struct ipip_net), +}; + +static int __init ipip_init(void) +{ + int err; + + printk(banner); + + err = register_pernet_device(&ipip_net_ops); + if (err < 0) + return err; + err = xfrm4_tunnel_register(&ipip_handler, AF_INET); + if (err < 0) { + unregister_pernet_device(&ipip_net_ops); + pr_info("%s: can't register tunnel\n", __func__); + } + return err; +} + +static void __exit ipip_fini(void) +{ + 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_NETDEV("tunl0"); |