| /* |
| * IPv6 virtual tunneling interface |
| * |
| * Copyright (C) 2013 secunet Security Networks AG |
| * |
| * Author: |
| * Steffen Klassert <steffen.klassert@secunet.com> |
| * |
| * 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 <linux/module.h> |
| #include <linux/capability.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/sockios.h> |
| #include <linux/icmp.h> |
| #include <linux/if.h> |
| #include <linux/in.h> |
| #include <linux/ip.h> |
| #include <linux/net.h> |
| #include <linux/in6.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_arp.h> |
| #include <linux/icmpv6.h> |
| #include <linux/init.h> |
| #include <linux/route.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/netfilter_ipv6.h> |
| #include <linux/slab.h> |
| #include <linux/hash.h> |
| |
| #include <linux/uaccess.h> |
| #include <linux/atomic.h> |
| |
| #include <net/icmp.h> |
| #include <net/ip.h> |
| #include <net/ip_tunnels.h> |
| #include <net/ipv6.h> |
| #include <net/ip6_route.h> |
| #include <net/addrconf.h> |
| #include <net/ip6_tunnel.h> |
| #include <net/xfrm.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| |
| #define IP6_VTI_HASH_SIZE_SHIFT 5 |
| #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_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, IP6_VTI_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 vti6 tunnel fallback device */ |
| struct net_device *fb_tnl_dev; |
| /* lists for storing tunnels in use */ |
| struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE]; |
| struct ip6_tnl __rcu *tnls_wc[1]; |
| struct ip6_tnl __rcu **tnls[2]; |
| }; |
| |
| #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); |
| struct in6_addr any; |
| |
| 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; |
| } |
| |
| memset(&any, 0, sizeof(any)); |
| hash = HASH(&any, local); |
| for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
| if (ipv6_addr_equal(local, &t->parms.laddr) && |
| (t->dev->flags & IFF_UP)) |
| return t; |
| } |
| |
| hash = HASH(remote, &any); |
| for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
| if (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 = 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, NET_NAME_UNKNOWN, vti6_dev_setup); |
| if (!dev) |
| 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)) { |
| if (create) |
| return NULL; |
| |
| 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 vti6_net *ip6n = net_generic(t->net, vti6_net_id); |
| |
| if (dev == ip6n->fb_tnl_dev) |
| RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
| else |
| vti6_tnl_unlink(ip6n, t); |
| dev_put(dev); |
| } |
| |
| static int vti6_rcv(struct sk_buff *skb) |
| { |
| struct ip6_tnl *t; |
| const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
| |
| rcu_read_lock(); |
| t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); |
| if (t) { |
| 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; |
| } |
| |
| rcu_read_unlock(); |
| |
| return xfrm6_rcv_tnl(skb, t); |
| } |
| rcu_read_unlock(); |
| return -EINVAL; |
| discard: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static int vti6_rcv_cb(struct sk_buff *skb, int err) |
| { |
| unsigned short family; |
| struct net_device *dev; |
| struct pcpu_sw_netstats *tstats; |
| struct xfrm_state *x; |
| struct xfrm_mode *inner_mode; |
| struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6; |
| u32 orig_mark = skb->mark; |
| int ret; |
| |
| if (!t) |
| return 1; |
| |
| dev = t->dev; |
| |
| if (err) { |
| dev->stats.rx_errors++; |
| dev->stats.rx_dropped++; |
| |
| return 0; |
| } |
| |
| x = xfrm_input_state(skb); |
| |
| inner_mode = x->inner_mode; |
| |
| if (x->sel.family == AF_UNSPEC) { |
| inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); |
| if (inner_mode == NULL) { |
| XFRM_INC_STATS(dev_net(skb->dev), |
| LINUX_MIB_XFRMINSTATEMODEERROR); |
| return -EINVAL; |
| } |
| } |
| |
| family = inner_mode->afinfo->family; |
| |
| skb->mark = be32_to_cpu(t->parms.i_key); |
| ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); |
| skb->mark = orig_mark; |
| |
| if (!ret) |
| return -EPERM; |
| |
| skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev))); |
| skb->dev = dev; |
| |
| tstats = this_cpu_ptr(dev->tstats); |
| u64_stats_update_begin(&tstats->syncp); |
| tstats->rx_packets++; |
| tstats->rx_bytes += skb->len; |
| u64_stats_update_end(&tstats->syncp); |
| |
| 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); |
| } |
| |
| static bool vti6_state_check(const struct xfrm_state *x, |
| const struct in6_addr *dst, |
| const struct in6_addr *src) |
| { |
| xfrm_address_t *daddr = (xfrm_address_t *)dst; |
| xfrm_address_t *saddr = (xfrm_address_t *)src; |
| |
| /* if there is no transform then this tunnel is not functional. |
| * Or if the xfrm is not mode tunnel. |
| */ |
| if (!x || x->props.mode != XFRM_MODE_TUNNEL || |
| x->props.family != AF_INET6) |
| return false; |
| |
| if (ipv6_addr_any(dst)) |
| return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6); |
| |
| if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6)) |
| return false; |
| |
| return true; |
| } |
| |
| /** |
| * vti6_xmit - send a packet |
| * @skb: the outgoing socket buffer |
| * @dev: the outgoing tunnel device |
| * @fl: the flow informations for the xfrm_lookup |
| **/ |
| static int |
| vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct net_device_stats *stats = &t->dev->stats; |
| struct dst_entry *dst = skb_dst(skb); |
| struct net_device *tdev; |
| struct xfrm_state *x; |
| int err = -1; |
| int mtu; |
| |
| if (!dst) |
| goto tx_err_link_failure; |
| |
| dst_hold(dst); |
| dst = xfrm_lookup(t->net, dst, fl, NULL, 0); |
| if (IS_ERR(dst)) { |
| err = PTR_ERR(dst); |
| dst = NULL; |
| goto tx_err_link_failure; |
| } |
| |
| x = dst->xfrm; |
| if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr)) |
| goto tx_err_link_failure; |
| |
| if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr, |
| (const struct in6_addr *)&x->id.daddr)) |
| 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_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
| skb_dst_set(skb, dst); |
| skb->dev = skb_dst(skb)->dev; |
| |
| mtu = dst_mtu(dst); |
| if (!skb->ignore_df && skb->len > mtu) { |
| skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu); |
| |
| if (skb->protocol == htons(ETH_P_IPV6)) |
| icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| else |
| icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
| htonl(mtu)); |
| |
| return -EMSGSIZE; |
| } |
| |
| err = dst_output(t->net, skb->sk, skb); |
| if (net_xmit_eval(err) == 0) { |
| struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); |
| |
| u64_stats_update_begin(&tstats->syncp); |
| tstats->tx_bytes += skb->len; |
| tstats->tx_packets++; |
| u64_stats_update_end(&tstats->syncp); |
| } else { |
| stats->tx_errors++; |
| stats->tx_aborted_errors++; |
| } |
| |
| return 0; |
| tx_err_link_failure: |
| stats->tx_carrier_errors++; |
| dst_link_failure(skb); |
| tx_err_dst_release: |
| dst_release(dst); |
| 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; |
| struct ipv6hdr *ipv6h; |
| struct flowi fl; |
| int ret; |
| |
| memset(&fl, 0, sizeof(fl)); |
| |
| switch (skb->protocol) { |
| case htons(ETH_P_IPV6): |
| ipv6h = ipv6_hdr(skb); |
| |
| if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
| vti6_addr_conflict(t, ipv6h)) |
| goto tx_err; |
| |
| xfrm_decode_session(skb, &fl, AF_INET6); |
| memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
| break; |
| case htons(ETH_P_IP): |
| xfrm_decode_session(skb, &fl, AF_INET); |
| memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
| break; |
| default: |
| goto tx_err; |
| } |
| |
| /* override mark with tunnel output key */ |
| fl.flowi_mark = be32_to_cpu(t->parms.o_key); |
| |
| ret = vti6_xmit(skb, dev, &fl); |
| 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 int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| u8 type, u8 code, int offset, __be32 info) |
| { |
| __be32 spi; |
| __u32 mark; |
| struct xfrm_state *x; |
| struct ip6_tnl *t; |
| struct ip_esp_hdr *esph; |
| struct ip_auth_hdr *ah; |
| struct ip_comp_hdr *ipch; |
| struct net *net = dev_net(skb->dev); |
| const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
| int protocol = iph->nexthdr; |
| |
| t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr); |
| if (!t) |
| return -1; |
| |
| mark = be32_to_cpu(t->parms.o_key); |
| |
| switch (protocol) { |
| case IPPROTO_ESP: |
| esph = (struct ip_esp_hdr *)(skb->data + offset); |
| spi = esph->spi; |
| break; |
| case IPPROTO_AH: |
| ah = (struct ip_auth_hdr *)(skb->data + offset); |
| spi = ah->spi; |
| break; |
| case IPPROTO_COMP: |
| ipch = (struct ip_comp_hdr *)(skb->data + offset); |
| spi = htonl(ntohs(ipch->cpi)); |
| break; |
| default: |
| return 0; |
| } |
| |
| if (type != ICMPV6_PKT_TOOBIG && |
| type != NDISC_REDIRECT) |
| return 0; |
| |
| x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
| spi, protocol, AF_INET6); |
| if (!x) |
| return 0; |
| |
| if (type == NDISC_REDIRECT) |
| ip6_redirect(skb, net, skb->dev->ifindex, 0); |
| else |
| ip6_update_pmtu(skb, net, info, 0, 0); |
| xfrm_state_put(x); |
| |
| return 0; |
| } |
| |
| static void vti6_link_config(struct ip6_tnl *t) |
| { |
| struct net_device *dev = t->dev; |
| struct __ip6_tnl_parm *p = &t->parms; |
| |
| memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
| memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); |
| |
| 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; |
| } |
| |
| /** |
| * 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; |
| dst_cache_reset(&t->dst_cache); |
| 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; |
| p->proto = u->proto; |
| |
| 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; |
| u->proto = p->proto; |
| |
| 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 vti6 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 "ip6_vti0", 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) |
| 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) { |
| 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) |
| 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_init = vti6_dev_init, |
| .ndo_uninit = vti6_dev_uninit, |
| .ndo_start_xmit = vti6_tnl_xmit, |
| .ndo_do_ioctl = vti6_ioctl, |
| .ndo_change_mtu = vti6_change_mtu, |
| .ndo_get_stats64 = ip_tunnel_get_stats64, |
| .ndo_get_iflink = ip6_tnl_get_iflink, |
| }; |
| |
| /** |
| * 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) |
| { |
| 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; |
| dev->flags |= IFF_NOARP; |
| dev->addr_len = sizeof(struct in6_addr); |
| netif_keep_dst(dev); |
| } |
| |
| /** |
| * 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 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| 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); |
| |
| t->parms.proto = IPPROTO_IPV6; |
| dev_hold(dev); |
| |
| 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]) |
| parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]); |
| |
| if (data[IFLA_VTI_REMOTE]) |
| parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]); |
| |
| if (data[IFLA_VTI_IKEY]) |
| parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); |
| |
| if (data[IFLA_VTI_OKEY]) |
| parms->o_key = nla_get_be32(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 void vti6_dellink(struct net_device *dev, struct list_head *head) |
| { |
| struct net *net = dev_net(dev); |
| struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
| |
| if (dev != ip6n->fb_tnl_dev) |
| unregister_netdevice_queue(dev, head); |
| } |
| |
| 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_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) || |
| nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) || |
| nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || |
| nla_put_be32(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, |
| .dellink = vti6_dellink, |
| .changelink = vti6_changelink, |
| .get_size = vti6_get_size, |
| .fill_info = vti6_fill_info, |
| .get_link_net = ip6_tnl_get_link_net, |
| }; |
| |
| static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n) |
| { |
| int h; |
| struct ip6_tnl *t; |
| LIST_HEAD(list); |
| |
| for (h = 0; h < IP6_VTI_HASH_SIZE; h++) { |
| t = rtnl_dereference(ip6n->tnls_r_l[h]); |
| while (t) { |
| 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", |
| NET_NAME_UNKNOWN, vti6_dev_setup); |
| |
| if (!ip6n->fb_tnl_dev) |
| goto err_alloc_dev; |
| dev_net_set(ip6n->fb_tnl_dev, net); |
| ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops; |
| |
| 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), |
| }; |
| |
| static struct xfrm6_protocol vti_esp6_protocol __read_mostly = { |
| .handler = vti6_rcv, |
| .cb_handler = vti6_rcv_cb, |
| .err_handler = vti6_err, |
| .priority = 100, |
| }; |
| |
| static struct xfrm6_protocol vti_ah6_protocol __read_mostly = { |
| .handler = vti6_rcv, |
| .cb_handler = vti6_rcv_cb, |
| .err_handler = vti6_err, |
| .priority = 100, |
| }; |
| |
| static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = { |
| .handler = vti6_rcv, |
| .cb_handler = vti6_rcv_cb, |
| .err_handler = vti6_err, |
| .priority = 100, |
| }; |
| |
| static bool is_vti6_tunnel(const struct net_device *dev) |
| { |
| return dev->netdev_ops == &vti6_netdev_ops; |
| } |
| |
| static int vti6_device_event(struct notifier_block *unused, |
| unsigned long event, void *ptr) |
| { |
| struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| struct ip6_tnl *t = netdev_priv(dev); |
| |
| if (!is_vti6_tunnel(dev)) |
| return NOTIFY_DONE; |
| |
| switch (event) { |
| case NETDEV_DOWN: |
| if (!net_eq(t->net, dev_net(dev))) |
| xfrm_garbage_collect(t->net); |
| break; |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block vti6_notifier_block __read_mostly = { |
| .notifier_call = vti6_device_event, |
| }; |
| |
| /** |
| * vti6_tunnel_init - register protocol and reserve needed resources |
| * |
| * Return: 0 on success |
| **/ |
| static int __init vti6_tunnel_init(void) |
| { |
| const char *msg; |
| int err; |
| |
| register_netdevice_notifier(&vti6_notifier_block); |
| |
| msg = "tunnel device"; |
| err = register_pernet_device(&vti6_net_ops); |
| if (err < 0) |
| goto pernet_dev_failed; |
| |
| msg = "tunnel protocols"; |
| err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP); |
| if (err < 0) |
| goto xfrm_proto_esp_failed; |
| err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH); |
| if (err < 0) |
| goto xfrm_proto_ah_failed; |
| err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP); |
| if (err < 0) |
| goto xfrm_proto_comp_failed; |
| |
| msg = "netlink interface"; |
| err = rtnl_link_register(&vti6_link_ops); |
| if (err < 0) |
| goto rtnl_link_failed; |
| |
| return 0; |
| |
| rtnl_link_failed: |
| xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
| xfrm_proto_comp_failed: |
| xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
| xfrm_proto_ah_failed: |
| xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
| xfrm_proto_esp_failed: |
| unregister_pernet_device(&vti6_net_ops); |
| pernet_dev_failed: |
| unregister_netdevice_notifier(&vti6_notifier_block); |
| pr_err("vti6 init: failed to register %s\n", msg); |
| return err; |
| } |
| |
| /** |
| * vti6_tunnel_cleanup - free resources and unregister protocol |
| **/ |
| static void __exit vti6_tunnel_cleanup(void) |
| { |
| rtnl_link_unregister(&vti6_link_ops); |
| xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
| xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
| xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
| unregister_pernet_device(&vti6_net_ops); |
| unregister_netdevice_notifier(&vti6_notifier_block); |
| } |
| |
| 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"); |