From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Williams Subject: Re: [PATCH RFC 2/2] ipv6: Add support for IPsec virtual tunnel interfaces Date: Mon, 26 Aug 2013 11:37:38 -0500 Message-ID: <1377535058.11709.21.camel@dcbw.foobar.com> References: <20130819062623.GN26773@secunet.com> <20130819062730.GP26773@secunet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Steffen Klassert Return-path: Received: from mx1.redhat.com ([209.132.183.28]:21568 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751998Ab3HZQdk (ORCPT ); Mon, 26 Aug 2013 12:33:40 -0400 In-Reply-To: <20130819062730.GP26773@secunet.com> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, 2013-08-19 at 08:27 +0200, Steffen Klassert wrote: > This patch adds IPv6 support for IPsec virtual tunnel interfaces > (vti). IPsec virtual tunnel interfaces provide a routable interface > for IPsec tunnel endpoints. Are new ioctls for this kind of thing kosher? Or should it be using netlink instead? Dan > Signed-off-by: Steffen Klassert > --- > net/ipv6/Kconfig | 11 + > net/ipv6/Makefile | 1 + > net/ipv6/ip6_vti.c | 1092 ++++++++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 1104 insertions(+) > create mode 100644 net/ipv6/ip6_vti.c > > diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig > index 11b13ea..e1a8d90 100644 > --- a/net/ipv6/Kconfig > +++ b/net/ipv6/Kconfig > @@ -153,6 +153,17 @@ config INET6_XFRM_MODE_ROUTEOPTIMIZATION > ---help--- > Support for MIPv6 route optimization mode. > > +config IPV6_VTI > +tristate "Virtual (secure) IPv6: tunneling" > + select IPV6_TUNNEL > + depends on INET6_XFRM_MODE_TUNNEL > + ---help--- > + Tunneling means encapsulating data of one protocol type within > + another protocol and sending it over a channel that understands the > + encapsulating protocol. This can be used with xfrm mode tunnel to give > + the notion of a secure tunnel for IPSEC and then use routing protocol > + on top. > + > config IPV6_SIT > tristate "IPv6: IPv6-in-IPv4 tunnel (SIT driver)" > select INET_TUNNEL > diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile > index 470a9c0..17bb830 100644 > --- a/net/ipv6/Makefile > +++ b/net/ipv6/Makefile > @@ -36,6 +36,7 @@ obj-$(CONFIG_INET6_XFRM_MODE_BEET) += xfrm6_mode_beet.o > obj-$(CONFIG_IPV6_MIP6) += mip6.o > obj-$(CONFIG_NETFILTER) += netfilter/ > > +obj-$(CONFIG_IPV6_VTI) += ip6_vti.o > obj-$(CONFIG_IPV6_SIT) += sit.o > obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o > obj-$(CONFIG_IPV6_GRE) += ip6_gre.o > diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c > new file mode 100644 > index 0000000..fb0b6b0 > --- /dev/null > +++ b/net/ipv6/ip6_vti.c > @@ -0,0 +1,1092 @@ > +/* > + * IPv6 virtual tunneling interface > + * > + * Copyright (C) 2013 secunet Security Networks AG > + * > + * Author: > + * Steffen Klassert > + * > + * Based on: > + * net/ipv6/ip6_tunnel.c > + * > + * 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. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include > +#include > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) > + > +#define HASH_SIZE_SHIFT 5 > +#define HASH_SIZE (1 << HASH_SIZE_SHIFT) > + > +static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) > +{ > + u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); > + > + return hash_32(hash, HASH_SIZE_SHIFT); > +} > + > +static int vti6_dev_init(struct net_device *dev); > +static void vti6_dev_setup(struct net_device *dev); > +static struct rtnl_link_ops vti6_link_ops __read_mostly; > + > +static int vti6_net_id __read_mostly; > +struct vti6_net { > + /* the IPv6 tunnel fallback device */ > + struct net_device *fb_tnl_dev; > + /* lists for storing tunnels in use */ > + struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; > + struct ip6_tnl __rcu *tnls_wc[1]; > + struct ip6_tnl __rcu **tnls[2]; > +}; > + > +static struct net_device_stats *vti6_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; > +} > + > +#define for_each_vti6_tunnel_rcu(start) \ > + for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) > + > +/** > + * vti6_tnl_lookup - fetch tunnel matching the end-point addresses > + * @net: network namespace > + * @remote: the address of the tunnel exit-point > + * @local: the address of the tunnel entry-point > + * > + * Return: > + * tunnel matching given end-points if found, > + * else fallback tunnel if its device is up, > + * else %NULL > + **/ > +static struct ip6_tnl * > +vti6_tnl_lookup(struct net *net, const struct in6_addr *remote, > + const struct in6_addr *local) > +{ > + unsigned int hash = HASH(remote, local); > + struct ip6_tnl *t; > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + > + for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { > + if (ipv6_addr_equal(local, &t->parms.laddr) && > + ipv6_addr_equal(remote, &t->parms.raddr) && > + (t->dev->flags & IFF_UP)) > + return t; > + } > + t = rcu_dereference(ip6n->tnls_wc[0]); > + if (t && (t->dev->flags & IFF_UP)) > + return t; > + > + return NULL; > +} > + > +/** > + * vti6_tnl_bucket - get head of list matching given tunnel parameters > + * @p: parameters containing tunnel end-points > + * > + * Description: > + * vti6_tnl_bucket() returns the head of the list matching the > + * &struct in6_addr entries laddr and raddr in @p. > + * > + * Return: head of IPv6 tunnel list > + **/ > +static struct ip6_tnl __rcu ** > +vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p) > +{ > + const struct in6_addr *remote = &p->raddr; > + const struct in6_addr *local = &p->laddr; > + unsigned int h = 0; > + int prio = 0; > + > + if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { > + prio = 1; > + h = HASH(remote, local); > + } > + return &ip6n->tnls[prio][h]; > +} > + > +static void > +vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t) > +{ > + struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms); > + > + rcu_assign_pointer(t->next , rtnl_dereference(*tp)); > + rcu_assign_pointer(*tp, t); > +} > + > +static void > +vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t) > +{ > + struct ip6_tnl __rcu **tp; > + struct ip6_tnl *iter; > + > + for (tp = vti6_tnl_bucket(ip6n, &t->parms); > + (iter = rtnl_dereference(*tp)) != NULL; > + tp = &iter->next) { > + if (t == iter) { > + rcu_assign_pointer(*tp, t->next); > + break; > + } > + } > +} > + > +static void vti6_dev_free(struct net_device *dev) > +{ > + free_percpu(dev->tstats); > + free_netdev(dev); > +} > + > +static int vti6_tnl_create2(struct net_device *dev) > +{ > + struct ip6_tnl *t = netdev_priv(dev); > + struct net *net = dev_net(dev); > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + int err; > + > + err = vti6_dev_init(dev); > + if (err < 0) > + goto out; > + > + err = register_netdevice(dev); > + if (err < 0) > + goto out; > + > + strcpy(t->parms.name, dev->name); > + dev->rtnl_link_ops = &vti6_link_ops; > + > + dev_hold(dev); > + vti6_tnl_link(ip6n, t); > + > + return 0; > + > +out: > + return err; > +} > +static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) > +{ > + struct net_device *dev; > + struct ip6_tnl *t; > + char name[IFNAMSIZ]; > + int err; > + > + if (p->name[0]) > + strlcpy(name, p->name, IFNAMSIZ); > + else > + sprintf(name, "ip6_vti%%d"); > + > + dev = alloc_netdev(sizeof (*t), name, vti6_dev_setup); > + if (dev == NULL) > + goto failed; > + > + dev_net_set(dev, net); > + > + t = netdev_priv(dev); > + t->parms = *p; > + t->net = dev_net(dev); > + > + err = vti6_tnl_create2(dev); > + if (err < 0) > + goto failed_free; > + > + return t; > + > +failed_free: > + vti6_dev_free(dev); > +failed: > + return NULL; > +} > + > +/** > + * vti6_locate - find or create tunnel matching given parameters > + * @net: network namespace > + * @p: tunnel parameters > + * @create: != 0 if allowed to create new tunnel if no match found > + * > + * Description: > + * vti6_locate() first tries to locate an existing tunnel > + * based on @parms. If this is unsuccessful, but @create is set a new > + * tunnel device is created and registered for use. > + * > + * Return: > + * matching tunnel or NULL > + **/ > +static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p, int create) > +{ > + const struct in6_addr *remote = &p->raddr; > + const struct in6_addr *local = &p->laddr; > + struct ip6_tnl __rcu **tp; > + struct ip6_tnl *t; > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + > + for (tp = vti6_tnl_bucket(ip6n, p); > + (t = rtnl_dereference(*tp)) != NULL; > + tp = &t->next) { > + if (ipv6_addr_equal(local, &t->parms.laddr) && > + ipv6_addr_equal(remote, &t->parms.raddr)) > + return t; > + } > + if (!create) > + return NULL; > + return vti6_tnl_create(net, p); > +} > + > +/** > + * vti6_dev_uninit - tunnel device uninitializer > + * @dev: the device to be destroyed > + * > + * Description: > + * vti6_dev_uninit() removes tunnel from its list > + **/ > +static void > +vti6_dev_uninit(struct net_device *dev) > +{ > + struct ip6_tnl *t = netdev_priv(dev); > + struct net *net = dev_net(dev); > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + > + if (dev == ip6n->fb_tnl_dev) > + RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); > + else > + vti6_tnl_unlink(ip6n, t); > + ip6_tnl_dst_reset(t); > + dev_put(dev); > +} > + > +/** > + * vti6_tnl_err - tunnel error handler > + * > + * Description: > + * vti6_err() handle errors in the tunnel. > + **/ > +static int > +vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, > + u8 type, u8 code, int offset, __be32 info) > +{ > + struct net *net = dev_net(skb->dev); > + const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; > + struct ip6_tnl *t; > + int err = -ENOENT; > + > + rcu_read_lock(); > + if ((t = vti6_tnl_lookup(net, &ipv6h->daddr, > + &ipv6h->saddr)) == NULL) > + goto out; > + > + if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) > + goto out; > + > + err = 0; > + > + switch (type) { > + case ICMPV6_DEST_UNREACH: > + case ICMPV6_TIME_EXCEED: > + case ICMPV6_PARAMPROB: > + break; > + case ICMPV6_PKT_TOOBIG: > + ip6_update_pmtu(skb, net, info, 0, 0); > + } > + > + > +out: > + rcu_read_unlock(); > + return err; > +} > + > +static int vti6_rcv(struct sk_buff *skb) > +{ > + struct ip6_tnl *t; > + const struct ipv6hdr *ipv6h = ipv6_hdr(skb); > + > + rcu_read_lock(); > + > + if ((t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, > + &ipv6h->daddr)) != NULL) { > + struct pcpu_tstats *tstats; > + > + if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) { > + rcu_read_unlock(); > + goto discard; > + } > + > + if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { > + rcu_read_unlock(); > + return 0; > + } > + > + if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { > + t->dev->stats.rx_dropped++; > + rcu_read_unlock(); > + goto discard; > + } > + > + tstats = this_cpu_ptr(t->dev->tstats); > + tstats->rx_packets++; > + tstats->rx_bytes += skb->len; > + > + skb->mark = 0; > + secpath_reset(skb); > + skb->dev = t->dev; > + > + rcu_read_unlock(); > + return 0; > + } > + rcu_read_unlock(); > + return 1; > + > +discard: > + kfree_skb(skb); > + return 0; > +} > + > +/** > + * vti6_addr_conflict - compare packet addresses to tunnel's own > + * @t: the outgoing tunnel device > + * @hdr: IPv6 header from the incoming packet > + * > + * Description: > + * Avoid trivial tunneling loop by checking that tunnel exit-point > + * doesn't match source of incoming packet. > + * > + * Return: > + * 1 if conflict, > + * 0 else > + **/ > +static inline bool > +vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) > +{ > + return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); > +} > + > +/** > + * vti6_xmit - send a packet > + * @skb: the outgoing socket buffer > + * @dev: the outgoing tunnel device > + **/ > +static int vti6_xmit(struct sk_buff *skb, struct net_device *dev) > +{ > + struct net *net = dev_net(dev); > + struct ip6_tnl *t = netdev_priv(dev); > + struct net_device_stats *stats = &t->dev->stats; > + struct dst_entry *dst = NULL, *ndst = NULL; > + struct flowi6 fl6; > + struct ipv6hdr *ipv6h = ipv6_hdr(skb); > + struct net_device *tdev; > + int err = -1; > + > + if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || > + !ip6_tnl_xmit_ctl(t) || vti6_addr_conflict(t, ipv6h)) > + return err; > + > + dst = ip6_tnl_dst_check(t); > + if (!dst) { > + memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); > + > + ndst = ip6_route_output(net, NULL, &fl6); > + > + if (ndst->error) > + goto tx_err_link_failure; > + ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(&fl6), NULL, 0); > + if (IS_ERR(ndst)) { > + err = PTR_ERR(ndst); > + ndst = NULL; > + goto tx_err_link_failure; > + } > + dst = ndst; > + } > + > + if (!dst->xfrm || dst->xfrm->props.mode != XFRM_MODE_TUNNEL) > + goto tx_err_link_failure; > + > + tdev = dst->dev; > + > + if (tdev == dev) { > + stats->collisions++; > + net_warn_ratelimited("%s: Local routing loop detected!\n", > + t->parms.name); > + goto tx_err_dst_release; > + } > + > + > + skb_dst_drop(skb); > + skb_dst_set_noref(skb, dst); > + > + ip6tunnel_xmit(skb, dev); > + if (ndst) > + ip6_tnl_dst_store(t, ndst); > + return 0; > +tx_err_link_failure: > + stats->tx_carrier_errors++; > + dst_link_failure(skb); > +tx_err_dst_release: > + dst_release(ndst); > + return err; > +} > + > +static netdev_tx_t > +vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) > +{ > + struct ip6_tnl *t = netdev_priv(dev); > + struct net_device_stats *stats = &t->dev->stats; > + int ret; > + > + switch (skb->protocol) { > + case htons(ETH_P_IPV6): > + ret = vti6_xmit(skb, dev); > + break; > + default: > + goto tx_err; > + } > + > + if (ret < 0) > + goto tx_err; > + > + return NETDEV_TX_OK; > + > +tx_err: > + stats->tx_errors++; > + stats->tx_dropped++; > + kfree_skb(skb); > + return NETDEV_TX_OK; > +} > + > +static void vti6_link_config(struct ip6_tnl *t) > +{ > + struct net_device *dev = t->dev; > + struct __ip6_tnl_parm *p = &t->parms; > + struct flowi6 *fl6 = &t->fl.u.ip6; > + > + memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); > + memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); > + > + /* Set up flowi template */ > + fl6->saddr = p->laddr; > + fl6->daddr = p->raddr; > + fl6->flowi6_oif = p->link; > + fl6->flowi6_mark = p->i_key; > + fl6->flowi6_proto = p->proto; > + fl6->flowlabel = 0; > + > + p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); > + p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); > + > + if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) > + dev->flags |= IFF_POINTOPOINT; > + else > + dev->flags &= ~IFF_POINTOPOINT; > + > + dev->iflink = p->link; > + > + if (p->flags & IP6_TNL_F_CAP_XMIT) { > + int strict = (ipv6_addr_type(&p->raddr) & > + (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); > + > + struct rt6_info *rt = rt6_lookup(dev_net(dev), > + &p->raddr, &p->laddr, > + p->link, strict); > + > + if (rt == NULL) > + return; > + > + if (rt->dst.dev) { > + dev->hard_header_len = rt->dst.dev->hard_header_len + > + sizeof (struct ipv6hdr); > + > + dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr); > + > + if (dev->mtu < IPV6_MIN_MTU) > + dev->mtu = IPV6_MIN_MTU; > + } > + ip6_rt_put(rt); > + } > +} > + > +/** > + * vti6_tnl_change - update the tunnel parameters > + * @t: tunnel to be changed > + * @p: tunnel configuration parameters > + * > + * Description: > + * vti6_tnl_change() updates the tunnel parameters > + **/ > +static int > +vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) > +{ > + t->parms.laddr = p->laddr; > + t->parms.raddr = p->raddr; > + t->parms.link = p->link; > + t->parms.i_key = p->i_key; > + t->parms.o_key = p->o_key; > + t->parms.proto = p->proto; > + ip6_tnl_dst_reset(t); > + vti6_link_config(t); > + return 0; > +} > + > +static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) > +{ > + struct net *net = dev_net(t->dev); > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + int err; > + > + vti6_tnl_unlink(ip6n, t); > + synchronize_net(); > + err = vti6_tnl_change(t, p); > + vti6_tnl_link(ip6n, t); > + netdev_state_change(t->dev); > + return err; > +} > + > +static void > +vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) > +{ > + p->laddr = u->laddr; > + p->raddr = u->raddr; > + p->link = u->link; > + p->i_key = u->i_key; > + p->o_key = u->o_key; > + > + memcpy(p->name, u->name, sizeof(u->name)); > +} > + > +static void > +vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) > +{ > + u->laddr = p->laddr; > + u->raddr = p->raddr; > + u->link = p->link; > + u->i_key = p->i_key; > + u->o_key = p->o_key; > + memcpy(u->name, p->name, sizeof(u->name)); > +} > + > +/** > + * vti6_tnl_ioctl - configure vti6 tunnels from userspace > + * @dev: virtual device associated with tunnel > + * @ifr: parameters passed from userspace > + * @cmd: command to be performed > + * > + * Description: > + * vti6_ioctl() is used for managing IPv6 tunnels > + * from userspace. > + * > + * The possible commands are the following: > + * %SIOCGETTUNNEL: get tunnel parameters for device > + * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters > + * %SIOCCHGTUNNEL: change tunnel parameters to those given > + * %SIOCDELTUNNEL: delete tunnel > + * > + * The fallback device "ip6tnl0", created during module > + * initialization, can be used for creating other tunnel devices. > + * > + * Return: > + * 0 on success, > + * %-EFAULT if unable to copy data to or from userspace, > + * %-EPERM if current process hasn't %CAP_NET_ADMIN set > + * %-EINVAL if passed tunnel parameters are invalid, > + * %-EEXIST if changing a tunnel's parameters would cause a conflict > + * %-ENODEV if attempting to change or delete a nonexisting device > + **/ > +static int > +vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) > +{ > + int err = 0; > + struct ip6_tnl_parm2 p; > + struct __ip6_tnl_parm p1; > + struct ip6_tnl *t = NULL; > + struct net *net = dev_net(dev); > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + > + switch (cmd) { > + case SIOCGETTUNNEL: > + if (dev == ip6n->fb_tnl_dev) { > + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { > + err = -EFAULT; > + break; > + } > + vti6_parm_from_user(&p1, &p); > + t = vti6_locate(net, &p1, 0); > + } else { > + memset(&p, 0, sizeof(p)); > + } > + if (t == NULL) > + t = netdev_priv(dev); > + vti6_parm_to_user(&p, &t->parms); > + if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { > + err = -EFAULT; > + } > + break; > + case SIOCADDTUNNEL: > + case SIOCCHGTUNNEL: > + err = -EPERM; > + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) > + break; > + err = -EFAULT; > + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) > + break; > + err = -EINVAL; > + if (p.proto != IPPROTO_IPV6 && p.proto != 0) > + break; > + vti6_parm_from_user(&p1, &p); > + t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL); > + if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { > + if (t != NULL) { > + if (t->dev != dev) { > + err = -EEXIST; > + break; > + } > + } else > + t = netdev_priv(dev); > + > + err = vti6_update(t, &p1); > + } > + if (t) { > + err = 0; > + vti6_parm_to_user(&p, &t->parms); > + if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) > + err = -EFAULT; > + > + } else > + err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); > + break; > + case SIOCDELTUNNEL: > + err = -EPERM; > + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) > + break; > + > + if (dev == ip6n->fb_tnl_dev) { > + err = -EFAULT; > + if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) > + break; > + err = -ENOENT; > + vti6_parm_from_user(&p1, &p); > + t = vti6_locate(net, &p1, 0); > + if (t == NULL) > + break; > + err = -EPERM; > + if (t->dev == ip6n->fb_tnl_dev) > + break; > + dev = t->dev; > + } > + err = 0; > + unregister_netdevice(dev); > + break; > + default: > + err = -EINVAL; > + } > + return err; > +} > + > +/** > + * vti6_tnl_change_mtu - change mtu manually for tunnel device > + * @dev: virtual device associated with tunnel > + * @new_mtu: the new mtu > + * > + * Return: > + * 0 on success, > + * %-EINVAL if mtu too small > + **/ > +static int vti6_change_mtu(struct net_device *dev, int new_mtu) > +{ > + if (new_mtu < IPV6_MIN_MTU) { > + return -EINVAL; > + } > + dev->mtu = new_mtu; > + return 0; > +} > + > +static const struct net_device_ops vti6_netdev_ops = { > + .ndo_uninit = vti6_dev_uninit, > + .ndo_start_xmit = vti6_tnl_xmit, > + .ndo_do_ioctl = vti6_ioctl, > + .ndo_change_mtu = vti6_change_mtu, > + .ndo_get_stats = vti6_get_stats, > +}; > + > +/** > + * vti6_dev_setup - setup virtual tunnel device > + * @dev: virtual device associated with tunnel > + * > + * Description: > + * Initialize function pointers and device parameters > + **/ > +static void vti6_dev_setup(struct net_device *dev) > +{ > + struct ip6_tnl *t; > + > + dev->netdev_ops = &vti6_netdev_ops; > + dev->destructor = vti6_dev_free; > + > + dev->type = ARPHRD_TUNNEL6; > + dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); > + dev->mtu = ETH_DATA_LEN; > + t = netdev_priv(dev); > + dev->flags |= IFF_NOARP; > + dev->addr_len = sizeof(struct in6_addr); > + dev->features |= NETIF_F_NETNS_LOCAL; > + dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; > +} > + > +/** > + * vti6_dev_init_gen - general initializer for all tunnel devices > + * @dev: virtual device associated with tunnel > + **/ > +static inline int vti6_dev_init_gen(struct net_device *dev) > +{ > + struct ip6_tnl *t = netdev_priv(dev); > + > + t->dev = dev; > + t->net = dev_net(dev); > + dev->tstats = alloc_percpu(struct pcpu_tstats); > + if (!dev->tstats) > + return -ENOMEM; > + return 0; > +} > + > +/** > + * vti6_dev_init - initializer for all non fallback tunnel devices > + * @dev: virtual device associated with tunnel > + **/ > +static int vti6_dev_init(struct net_device *dev) > +{ > + struct ip6_tnl *t = netdev_priv(dev); > + int err = vti6_dev_init_gen(dev); > + > + if (err) > + return err; > + vti6_link_config(t); > + return 0; > +} > + > +/** > + * vti6_fb_tnl_dev_init - initializer for fallback tunnel device > + * @dev: fallback device > + * > + * Return: 0 > + **/ > +static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev) > +{ > + struct ip6_tnl *t = netdev_priv(dev); > + struct net *net = dev_net(dev); > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + int err = vti6_dev_init_gen(dev); > + > + if (err) > + return err; > + > + t->parms.proto = IPPROTO_IPV6; > + dev_hold(dev); > + > + vti6_link_config(t); > + > + rcu_assign_pointer(ip6n->tnls_wc[0], t); > + return 0; > +} > + > +static int vti6_validate(struct nlattr *tb[], struct nlattr *data[]) > +{ > + return 0; > +} > + > +static void vti6_netlink_parms(struct nlattr *data[], > + struct __ip6_tnl_parm *parms) > +{ > + memset(parms, 0, sizeof(*parms)); > + > + if (!data) > + return; > + > + if (data[IFLA_VTI_LINK]) > + parms->link = nla_get_u32(data[IFLA_VTI_LINK]); > + > + if (data[IFLA_VTI_LOCAL]) > + nla_memcpy(&parms->laddr, data[IFLA_VTI_LOCAL], > + sizeof(struct in6_addr)); > + > + if (data[IFLA_VTI_REMOTE]) > + nla_memcpy(&parms->raddr, data[IFLA_VTI_REMOTE], > + sizeof(struct in6_addr)); > + > + if (data[IFLA_VTI_IKEY]) > + parms->i_key = nla_get_u32(data[IFLA_VTI_IKEY]); > + > + if (data[IFLA_VTI_OKEY]) > + parms->o_key = nla_get_u32(data[IFLA_VTI_OKEY]); > +} > + > +static int vti6_newlink(struct net *src_net, struct net_device *dev, > + struct nlattr *tb[], struct nlattr *data[]) > +{ > + struct net *net = dev_net(dev); > + struct ip6_tnl *nt; > + > + nt = netdev_priv(dev); > + vti6_netlink_parms(data, &nt->parms); > + > + nt->parms.proto = IPPROTO_IPV6; > + > + if (vti6_locate(net, &nt->parms, 0)) > + return -EEXIST; > + > + return vti6_tnl_create2(dev); > +} > + > +static int vti6_changelink(struct net_device *dev, struct nlattr *tb[], > + struct nlattr *data[]) > +{ > + struct ip6_tnl *t; > + struct __ip6_tnl_parm p; > + struct net *net = dev_net(dev); > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + > + if (dev == ip6n->fb_tnl_dev) > + return -EINVAL; > + > + vti6_netlink_parms(data, &p); > + > + t = vti6_locate(net, &p, 0); > + > + if (t) { > + if (t->dev != dev) > + return -EEXIST; > + } else > + t = netdev_priv(dev); > + > + return vti6_update(t, &p); > +} > + > +static size_t vti6_get_size(const struct net_device *dev) > +{ > + return > + /* IFLA_VTI_LINK */ > + nla_total_size(4) + > + /* IFLA_VTI_LOCAL */ > + nla_total_size(sizeof(struct in6_addr)) + > + /* IFLA_VTI_REMOTE */ > + nla_total_size(sizeof(struct in6_addr)) + > + /* IFLA_VTI_IKEY */ > + nla_total_size(4) + > + /* IFLA_VTI_OKEY */ > + nla_total_size(4) + > + 0; > +} > + > +static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) > +{ > + struct ip6_tnl *tunnel = netdev_priv(dev); > + struct __ip6_tnl_parm *parm = &tunnel->parms; > + > + if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) || > + nla_put(skb, IFLA_VTI_LOCAL, sizeof(struct in6_addr), > + &parm->laddr) || > + nla_put(skb, IFLA_VTI_REMOTE, sizeof(struct in6_addr), > + &parm->raddr) || > + nla_put_u32(skb, IFLA_VTI_IKEY, parm->i_key) || > + nla_put_u32(skb, IFLA_VTI_OKEY, parm->o_key)) > + goto nla_put_failure; > + return 0; > + > +nla_put_failure: > + return -EMSGSIZE; > +} > + > +static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { > + [IFLA_VTI_LINK] = { .type = NLA_U32 }, > + [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) }, > + [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, > + [IFLA_VTI_IKEY] = { .type = NLA_U32 }, > + [IFLA_VTI_OKEY] = { .type = NLA_U32 }, > +}; > + > +static struct rtnl_link_ops vti6_link_ops __read_mostly = { > + .kind = "vti6", > + .maxtype = IFLA_VTI_MAX, > + .policy = vti6_policy, > + .priv_size = sizeof(struct ip6_tnl), > + .setup = vti6_dev_setup, > + .validate = vti6_validate, > + .newlink = vti6_newlink, > + .changelink = vti6_changelink, > + .get_size = vti6_get_size, > + .fill_info = vti6_fill_info, > +}; > + > +static struct xfrm6_tunnel vti6_handler __read_mostly = { > + .handler = vti6_rcv, > + .err_handler = vti6_err, > + .priority = 1, > +}; > + > +static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n) > +{ > + int h; > + struct ip6_tnl *t; > + LIST_HEAD(list); > + > + for (h = 0; h < HASH_SIZE; h++) { > + t = rtnl_dereference(ip6n->tnls_r_l[h]); > + while (t != NULL) { > + unregister_netdevice_queue(t->dev, &list); > + t = rtnl_dereference(t->next); > + } > + } > + > + t = rtnl_dereference(ip6n->tnls_wc[0]); > + unregister_netdevice_queue(t->dev, &list); > + unregister_netdevice_many(&list); > +} > + > +static int __net_init vti6_init_net(struct net *net) > +{ > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + struct ip6_tnl *t = NULL; > + int err; > + > + ip6n->tnls[0] = ip6n->tnls_wc; > + ip6n->tnls[1] = ip6n->tnls_r_l; > + > + err = -ENOMEM; > + ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0", > + vti6_dev_setup); > + > + if (!ip6n->fb_tnl_dev) > + goto err_alloc_dev; > + dev_net_set(ip6n->fb_tnl_dev, net); > + > + err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev); > + if (err < 0) > + goto err_register; > + > + err = register_netdev(ip6n->fb_tnl_dev); > + if (err < 0) > + goto err_register; > + > + t = netdev_priv(ip6n->fb_tnl_dev); > + > + strcpy(t->parms.name, ip6n->fb_tnl_dev->name); > + return 0; > + > +err_register: > + vti6_dev_free(ip6n->fb_tnl_dev); > +err_alloc_dev: > + return err; > +} > + > +static void __net_exit vti6_exit_net(struct net *net) > +{ > + struct vti6_net *ip6n = net_generic(net, vti6_net_id); > + > + rtnl_lock(); > + vti6_destroy_tunnels(ip6n); > + rtnl_unlock(); > +} > + > +static struct pernet_operations vti6_net_ops = { > + .init = vti6_init_net, > + .exit = vti6_exit_net, > + .id = &vti6_net_id, > + .size = sizeof(struct vti6_net), > +}; > + > +/** > + * vti6_tunnel_init - register protocol and reserve needed resources > + * > + * Return: 0 on success > + **/ > +static int __init vti6_tunnel_init(void) > +{ > + int err; > + > + err = register_pernet_device(&vti6_net_ops); > + if (err < 0) > + goto out_pernet; > + > + err = xfrm6_mode_tunnel_input_register(&vti6_handler); > + if (err < 0) { > + pr_err("%s: can't register vti6\n", __func__); > + goto out; > + } > + err = rtnl_link_register(&vti6_link_ops); > + if (err < 0) > + goto rtnl_link_failed; > + > + return 0; > + > +rtnl_link_failed: > + xfrm6_mode_tunnel_input_deregister(&vti6_handler); > +out: > + unregister_pernet_device(&vti6_net_ops); > +out_pernet: > + return err; > +} > + > +/** > + * vti6_tunnel_cleanup - free resources and unregister protocol > + **/ > +static void __exit vti6_tunnel_cleanup(void) > +{ > + rtnl_link_unregister(&vti6_link_ops); > + if (xfrm6_mode_tunnel_input_deregister(&vti6_handler)) > + pr_info("%s: can't deregister vti6\n", __func__); > + > + unregister_pernet_device(&vti6_net_ops); > +} > + > +module_init(vti6_tunnel_init); > +module_exit(vti6_tunnel_cleanup); > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS_RTNL_LINK("vti6"); > +MODULE_ALIAS_NETDEV("ip6_vti0"); > +MODULE_AUTHOR("Steffen Klassert"); > +MODULE_DESCRIPTION("IPv6 virtual tunnel interface");