| /* |
| * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
| * |
| * 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. |
| * |
| * Changes: |
| * Roger Venning <r.venning@telstra.com>: 6to4 support |
| * Nate Thompson <nate@thebog.net>: 6to4 support |
| * Fred Templin <fred.l.templin@boeing.com>: isatap support |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/capability.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <linux/in6.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_arp.h> |
| #include <linux/icmp.h> |
| #include <linux/slab.h> |
| #include <linux/uaccess.h> |
| #include <linux/init.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <linux/if_ether.h> |
| |
| #include <net/sock.h> |
| #include <net/snmp.h> |
| |
| #include <net/ipv6.h> |
| #include <net/protocol.h> |
| #include <net/transp_v6.h> |
| #include <net/ip6_fib.h> |
| #include <net/ip6_route.h> |
| #include <net/ndisc.h> |
| #include <net/addrconf.h> |
| #include <net/ip.h> |
| #include <net/udp.h> |
| #include <net/icmp.h> |
| #include <net/ip_tunnels.h> |
| #include <net/inet_ecn.h> |
| #include <net/xfrm.h> |
| #include <net/dsfield.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| |
| /* |
| This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c |
| |
| For comments look at net/ipv4/ip_gre.c --ANK |
| */ |
| |
| #define IP6_SIT_HASH_SIZE 16 |
| #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
| |
| static bool log_ecn_error = true; |
| module_param(log_ecn_error, bool, 0644); |
| MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
| |
| static int ipip6_tunnel_init(struct net_device *dev); |
| static void ipip6_tunnel_setup(struct net_device *dev); |
| static void ipip6_dev_free(struct net_device *dev); |
| static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
| __be32 *v4dst); |
| static struct rtnl_link_ops sit_link_ops __read_mostly; |
| |
| static unsigned int sit_net_id __read_mostly; |
| struct sit_net { |
| struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; |
| struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; |
| struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; |
| struct ip_tunnel __rcu *tunnels_wc[1]; |
| struct ip_tunnel __rcu **tunnels[4]; |
| |
| struct net_device *fb_tunnel_dev; |
| }; |
| |
| /* |
| * Must be invoked with rcu_read_lock |
| */ |
| static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, |
| struct net_device *dev, |
| __be32 remote, __be32 local, |
| int sifindex) |
| { |
| unsigned int h0 = HASH(remote); |
| unsigned int h1 = HASH(local); |
| struct ip_tunnel *t; |
| struct sit_net *sitn = net_generic(net, sit_net_id); |
| int ifindex = dev ? dev->ifindex : 0; |
| |
| for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { |
| if (local == t->parms.iph.saddr && |
| remote == t->parms.iph.daddr && |
| (!dev || !t->parms.link || ifindex == t->parms.link || |
| sifindex == t->parms.link) && |
| (t->dev->flags & IFF_UP)) |
| return t; |
| } |
| for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { |
| if (remote == t->parms.iph.daddr && |
| (!dev || !t->parms.link || ifindex == t->parms.link || |
| sifindex == t->parms.link) && |
| (t->dev->flags & IFF_UP)) |
| return t; |
| } |
| for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { |
| if (local == t->parms.iph.saddr && |
| (!dev || !t->parms.link || ifindex == t->parms.link || |
| sifindex == t->parms.link) && |
| (t->dev->flags & IFF_UP)) |
| return t; |
| } |
| t = rcu_dereference(sitn->tunnels_wc[0]); |
| if (t && (t->dev->flags & IFF_UP)) |
| return t; |
| return NULL; |
| } |
| |
| static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, |
| 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 &sitn->tunnels[prio][h]; |
| } |
| |
| static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, |
| struct ip_tunnel *t) |
| { |
| return __ipip6_bucket(sitn, &t->parms); |
| } |
| |
| static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
| { |
| struct ip_tunnel __rcu **tp; |
| struct ip_tunnel *iter; |
| |
| for (tp = ipip6_bucket(sitn, t); |
| (iter = rtnl_dereference(*tp)) != NULL; |
| tp = &iter->next) { |
| if (t == iter) { |
| rcu_assign_pointer(*tp, t->next); |
| break; |
| } |
| } |
| } |
| |
| static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
| { |
| struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); |
| |
| rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
| rcu_assign_pointer(*tp, t); |
| } |
| |
| static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) |
| { |
| #ifdef CONFIG_IPV6_SIT_6RD |
| struct ip_tunnel *t = netdev_priv(dev); |
| |
| if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { |
| ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); |
| t->ip6rd.relay_prefix = 0; |
| t->ip6rd.prefixlen = 16; |
| t->ip6rd.relay_prefixlen = 0; |
| } else { |
| struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); |
| memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); |
| } |
| #endif |
| } |
| |
| static int ipip6_tunnel_create(struct net_device *dev) |
| { |
| struct ip_tunnel *t = netdev_priv(dev); |
| struct net *net = dev_net(dev); |
| struct sit_net *sitn = net_generic(net, sit_net_id); |
| int err; |
| |
| memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); |
| memcpy(dev->broadcast, &t->parms.iph.daddr, 4); |
| |
| if ((__force u16)t->parms.i_flags & SIT_ISATAP) |
| dev->priv_flags |= IFF_ISATAP; |
| |
| dev->rtnl_link_ops = &sit_link_ops; |
| |
| err = register_netdevice(dev); |
| if (err < 0) |
| goto out; |
| |
| ipip6_tunnel_clone_6rd(dev, sitn); |
| |
| dev_hold(dev); |
| |
| ipip6_tunnel_link(sitn, t); |
| return 0; |
| |
| out: |
| return err; |
| } |
| |
| static struct ip_tunnel *ipip6_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 sit_net *sitn = net_generic(net, sit_net_id); |
| |
| for (tp = __ipip6_bucket(sitn, parms); |
| (t = rtnl_dereference(*tp)) != NULL; |
| tp = &t->next) { |
| if (local == t->parms.iph.saddr && |
| remote == t->parms.iph.daddr && |
| parms->link == t->parms.link) { |
| if (create) |
| return NULL; |
| else |
| return t; |
| } |
| } |
| if (!create) |
| goto failed; |
| |
| if (parms->name[0]) { |
| if (!dev_valid_name(parms->name)) |
| goto failed; |
| strlcpy(name, parms->name, IFNAMSIZ); |
| } else { |
| strcpy(name, "sit%d"); |
| } |
| dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
| ipip6_tunnel_setup); |
| if (!dev) |
| return NULL; |
| |
| dev_net_set(dev, net); |
| |
| nt = netdev_priv(dev); |
| |
| nt->parms = *parms; |
| if (ipip6_tunnel_create(dev) < 0) |
| goto failed_free; |
| |
| return nt; |
| |
| failed_free: |
| free_netdev(dev); |
| failed: |
| return NULL; |
| } |
| |
| #define for_each_prl_rcu(start) \ |
| for (prl = rcu_dereference(start); \ |
| prl; \ |
| prl = rcu_dereference(prl->next)) |
| |
| static struct ip_tunnel_prl_entry * |
| __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
| { |
| struct ip_tunnel_prl_entry *prl; |
| |
| for_each_prl_rcu(t->prl) |
| if (prl->addr == addr) |
| break; |
| return prl; |
| |
| } |
| |
| static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
| struct ip_tunnel_prl __user *a) |
| { |
| struct ip_tunnel_prl kprl, *kp; |
| struct ip_tunnel_prl_entry *prl; |
| unsigned int cmax, c = 0, ca, len; |
| int ret = 0; |
| |
| if (copy_from_user(&kprl, a, sizeof(kprl))) |
| return -EFAULT; |
| cmax = kprl.datalen / sizeof(kprl); |
| if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) |
| cmax = 1; |
| |
| /* For simple GET or for root users, |
| * we try harder to allocate. |
| */ |
| kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? |
| kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : |
| NULL; |
| |
| rcu_read_lock(); |
| |
| ca = t->prl_count < cmax ? t->prl_count : cmax; |
| |
| if (!kp) { |
| /* We don't try hard to allocate much memory for |
| * non-root users. |
| * For root users, retry allocating enough memory for |
| * the answer. |
| */ |
| kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); |
| if (!kp) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| } |
| |
| c = 0; |
| for_each_prl_rcu(t->prl) { |
| if (c >= cmax) |
| break; |
| if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
| continue; |
| kp[c].addr = prl->addr; |
| kp[c].flags = prl->flags; |
| c++; |
| if (kprl.addr != htonl(INADDR_ANY)) |
| break; |
| } |
| out: |
| rcu_read_unlock(); |
| |
| len = sizeof(*kp) * c; |
| ret = 0; |
| if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) |
| ret = -EFAULT; |
| |
| kfree(kp); |
| |
| return ret; |
| } |
| |
| static int |
| ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) |
| { |
| struct ip_tunnel_prl_entry *p; |
| int err = 0; |
| |
| if (a->addr == htonl(INADDR_ANY)) |
| return -EINVAL; |
| |
| ASSERT_RTNL(); |
| |
| for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { |
| if (p->addr == a->addr) { |
| if (chg) { |
| p->flags = a->flags; |
| goto out; |
| } |
| err = -EEXIST; |
| goto out; |
| } |
| } |
| |
| if (chg) { |
| err = -ENXIO; |
| goto out; |
| } |
| |
| p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); |
| if (!p) { |
| err = -ENOBUFS; |
| goto out; |
| } |
| |
| p->next = t->prl; |
| p->addr = a->addr; |
| p->flags = a->flags; |
| t->prl_count++; |
| rcu_assign_pointer(t->prl, p); |
| out: |
| return err; |
| } |
| |
| static void prl_list_destroy_rcu(struct rcu_head *head) |
| { |
| struct ip_tunnel_prl_entry *p, *n; |
| |
| p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); |
| do { |
| n = rcu_dereference_protected(p->next, 1); |
| kfree(p); |
| p = n; |
| } while (p); |
| } |
| |
| static int |
| ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) |
| { |
| struct ip_tunnel_prl_entry *x; |
| struct ip_tunnel_prl_entry __rcu **p; |
| int err = 0; |
| |
| ASSERT_RTNL(); |
| |
| if (a && a->addr != htonl(INADDR_ANY)) { |
| for (p = &t->prl; |
| (x = rtnl_dereference(*p)) != NULL; |
| p = &x->next) { |
| if (x->addr == a->addr) { |
| *p = x->next; |
| kfree_rcu(x, rcu_head); |
| t->prl_count--; |
| goto out; |
| } |
| } |
| err = -ENXIO; |
| } else { |
| x = rtnl_dereference(t->prl); |
| if (x) { |
| t->prl_count = 0; |
| call_rcu(&x->rcu_head, prl_list_destroy_rcu); |
| t->prl = NULL; |
| } |
| } |
| out: |
| return err; |
| } |
| |
| static int |
| isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) |
| { |
| struct ip_tunnel_prl_entry *p; |
| int ok = 1; |
| |
| rcu_read_lock(); |
| p = __ipip6_tunnel_locate_prl(t, iph->saddr); |
| if (p) { |
| if (p->flags & PRL_DEFAULT) |
| skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
| else |
| skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; |
| } else { |
| const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; |
| |
| if (ipv6_addr_is_isatap(addr6) && |
| (addr6->s6_addr32[3] == iph->saddr) && |
| ipv6_chk_prefix(addr6, t->dev)) |
| skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
| else |
| ok = 0; |
| } |
| rcu_read_unlock(); |
| return ok; |
| } |
| |
| static void ipip6_tunnel_uninit(struct net_device *dev) |
| { |
| struct ip_tunnel *tunnel = netdev_priv(dev); |
| struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); |
| |
| if (dev == sitn->fb_tunnel_dev) { |
| RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); |
| } else { |
| ipip6_tunnel_unlink(sitn, tunnel); |
| ipip6_tunnel_del_prl(tunnel, NULL); |
| } |
| dst_cache_reset(&tunnel->dst_cache); |
| dev_put(dev); |
| } |
| |
| static int ipip6_err(struct sk_buff *skb, u32 info) |
| { |
| const struct iphdr *iph = (const struct iphdr *)skb->data; |
| const int type = icmp_hdr(skb)->type; |
| const int code = icmp_hdr(skb)->code; |
| unsigned int data_len = 0; |
| struct ip_tunnel *t; |
| int sifindex; |
| int err; |
| |
| switch (type) { |
| default: |
| case ICMP_PARAMETERPROB: |
| return 0; |
| |
| case ICMP_DEST_UNREACH: |
| switch (code) { |
| case ICMP_SR_FAILED: |
| /* Impossible event. */ |
| 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; |
| data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
| break; |
| case ICMP_REDIRECT: |
| break; |
| } |
| |
| err = -ENOENT; |
| |
| sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
| t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
| iph->daddr, iph->saddr, sifindex); |
| if (!t) |
| goto out; |
| |
| if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { |
| ipv4_update_pmtu(skb, dev_net(skb->dev), info, |
| t->parms.link, iph->protocol); |
| err = 0; |
| goto out; |
| } |
| if (type == ICMP_REDIRECT) { |
| ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, |
| iph->protocol); |
| err = 0; |
| goto out; |
| } |
| |
| err = 0; |
| if (__in6_dev_get(skb->dev) && |
| !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) |
| goto out; |
| |
| if (t->parms.iph.daddr == 0) |
| goto out; |
| |
| 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: |
| return err; |
| } |
| |
| static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, |
| const struct in6_addr *v6addr) |
| { |
| __be32 v4embed = 0; |
| if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) |
| return true; |
| return false; |
| } |
| |
| /* Checks if an address matches an address on the tunnel interface. |
| * Used to detect the NAT of proto 41 packets and let them pass spoofing test. |
| * Long story: |
| * This function is called after we considered the packet as spoofed |
| * in is_spoofed_6rd. |
| * We may have a router that is doing NAT for proto 41 packets |
| * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb |
| * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd |
| * function will return true, dropping the packet. |
| * But, we can still check if is spoofed against the IP |
| * addresses associated with the interface. |
| */ |
| static bool only_dnatted(const struct ip_tunnel *tunnel, |
| const struct in6_addr *v6dst) |
| { |
| int prefix_len; |
| |
| #ifdef CONFIG_IPV6_SIT_6RD |
| prefix_len = tunnel->ip6rd.prefixlen + 32 |
| - tunnel->ip6rd.relay_prefixlen; |
| #else |
| prefix_len = 48; |
| #endif |
| return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); |
| } |
| |
| /* Returns true if a packet is spoofed */ |
| static bool packet_is_spoofed(struct sk_buff *skb, |
| const struct iphdr *iph, |
| struct ip_tunnel *tunnel) |
| { |
| const struct ipv6hdr *ipv6h; |
| |
| if (tunnel->dev->priv_flags & IFF_ISATAP) { |
| if (!isatap_chksrc(skb, iph, tunnel)) |
| return true; |
| |
| return false; |
| } |
| |
| if (tunnel->dev->flags & IFF_POINTOPOINT) |
| return false; |
| |
| ipv6h = ipv6_hdr(skb); |
| |
| if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { |
| net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", |
| &iph->saddr, &ipv6h->saddr, |
| &iph->daddr, &ipv6h->daddr); |
| return true; |
| } |
| |
| if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) |
| return false; |
| |
| if (only_dnatted(tunnel, &ipv6h->daddr)) |
| return false; |
| |
| net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", |
| &iph->saddr, &ipv6h->saddr, |
| &iph->daddr, &ipv6h->daddr); |
| return true; |
| } |
| |
| static int ipip6_rcv(struct sk_buff *skb) |
| { |
| const struct iphdr *iph = ip_hdr(skb); |
| struct ip_tunnel *tunnel; |
| int sifindex; |
| int err; |
| |
| sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
| tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
| iph->saddr, iph->daddr, sifindex); |
| if (tunnel) { |
| struct pcpu_sw_netstats *tstats; |
| |
| if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && |
| tunnel->parms.iph.protocol != 0) |
| goto out; |
| |
| skb->mac_header = skb->network_header; |
| skb_reset_network_header(skb); |
| IPCB(skb)->flags = 0; |
| skb->dev = tunnel->dev; |
| |
| if (packet_is_spoofed(skb, iph, tunnel)) { |
| tunnel->dev->stats.rx_errors++; |
| goto out; |
| } |
| |
| if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), |
| !net_eq(tunnel->net, dev_net(tunnel->dev)))) |
| goto out; |
| |
| /* skb can be uncloned in iptunnel_pull_header, so |
| * old iph is no longer valid |
| */ |
| iph = (const struct iphdr *)skb_mac_header(skb); |
| err = IP_ECN_decapsulate(iph, skb); |
| if (unlikely(err)) { |
| if (log_ecn_error) |
| net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", |
| &iph->saddr, iph->tos); |
| if (err > 1) { |
| ++tunnel->dev->stats.rx_frame_errors; |
| ++tunnel->dev->stats.rx_errors; |
| goto out; |
| } |
| } |
| |
| tstats = this_cpu_ptr(tunnel->dev->tstats); |
| u64_stats_update_begin(&tstats->syncp); |
| tstats->rx_packets++; |
| tstats->rx_bytes += skb->len; |
| u64_stats_update_end(&tstats->syncp); |
| |
| netif_rx(skb); |
| |
| return 0; |
| } |
| |
| /* no tunnel matched, let upstream know, ipsec may handle it */ |
| return 1; |
| out: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static const struct tnl_ptk_info ipip_tpi = { |
| /* no tunnel info required for ipip. */ |
| .proto = htons(ETH_P_IP), |
| }; |
| |
| #if IS_ENABLED(CONFIG_MPLS) |
| static const struct tnl_ptk_info mplsip_tpi = { |
| /* no tunnel info required for mplsip. */ |
| .proto = htons(ETH_P_MPLS_UC), |
| }; |
| #endif |
| |
| static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) |
| { |
| const struct iphdr *iph; |
| struct ip_tunnel *tunnel; |
| int sifindex; |
| |
| sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; |
| |
| iph = ip_hdr(skb); |
| tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
| iph->saddr, iph->daddr, sifindex); |
| if (tunnel) { |
| const struct tnl_ptk_info *tpi; |
| |
| if (tunnel->parms.iph.protocol != ipproto && |
| tunnel->parms.iph.protocol != 0) |
| goto drop; |
| |
| if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| goto drop; |
| #if IS_ENABLED(CONFIG_MPLS) |
| if (ipproto == IPPROTO_MPLS) |
| tpi = &mplsip_tpi; |
| else |
| #endif |
| tpi = &ipip_tpi; |
| if (iptunnel_pull_header(skb, 0, tpi->proto, false)) |
| goto drop; |
| return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
| } |
| |
| return 1; |
| |
| drop: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static int ipip_rcv(struct sk_buff *skb) |
| { |
| return sit_tunnel_rcv(skb, IPPROTO_IPIP); |
| } |
| |
| #if IS_ENABLED(CONFIG_MPLS) |
| static int mplsip_rcv(struct sk_buff *skb) |
| { |
| return sit_tunnel_rcv(skb, IPPROTO_MPLS); |
| } |
| #endif |
| |
| /* |
| * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function |
| * stores the embedded IPv4 address in v4dst and returns true. |
| */ |
| static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, |
| __be32 *v4dst) |
| { |
| #ifdef CONFIG_IPV6_SIT_6RD |
| if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, |
| tunnel->ip6rd.prefixlen)) { |
| unsigned int pbw0, pbi0; |
| int pbi1; |
| u32 d; |
| |
| pbw0 = tunnel->ip6rd.prefixlen >> 5; |
| pbi0 = tunnel->ip6rd.prefixlen & 0x1f; |
| |
| d = tunnel->ip6rd.relay_prefixlen < 32 ? |
| (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> |
| tunnel->ip6rd.relay_prefixlen : 0; |
| |
| pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; |
| if (pbi1 > 0) |
| d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> |
| (32 - pbi1); |
| |
| *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); |
| return true; |
| } |
| #else |
| if (v6dst->s6_addr16[0] == htons(0x2002)) { |
| /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
| memcpy(v4dst, &v6dst->s6_addr16[1], 4); |
| return true; |
| } |
| #endif |
| return false; |
| } |
| |
| static inline __be32 try_6rd(struct ip_tunnel *tunnel, |
| const struct in6_addr *v6dst) |
| { |
| __be32 dst = 0; |
| check_6rd(tunnel, v6dst, &dst); |
| return dst; |
| } |
| |
| /* |
| * This function assumes it is being called from dev_queue_xmit() |
| * and that skb is filled properly by that function. |
| */ |
| |
| static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
| struct net_device *dev) |
| { |
| struct ip_tunnel *tunnel = netdev_priv(dev); |
| const struct iphdr *tiph = &tunnel->parms.iph; |
| const struct ipv6hdr *iph6 = ipv6_hdr(skb); |
| 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 */ |
| unsigned int max_headroom; /* The extra header space needed */ |
| __be32 dst = tiph->daddr; |
| struct flowi4 fl4; |
| int mtu; |
| const struct in6_addr *addr6; |
| int addr_type; |
| u8 ttl; |
| u8 protocol = IPPROTO_IPV6; |
| int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
| |
| if (tos == 1) |
| tos = ipv6_get_dsfield(iph6); |
| |
| /* ISATAP (RFC4214) - must come before 6to4 */ |
| if (dev->priv_flags & IFF_ISATAP) { |
| struct neighbour *neigh = NULL; |
| bool do_tx_error = false; |
| |
| if (skb_dst(skb)) |
| neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
| |
| if (!neigh) { |
| net_dbg_ratelimited("nexthop == NULL\n"); |
| goto tx_error; |
| } |
| |
| addr6 = (const struct in6_addr *)&neigh->primary_key; |
| addr_type = ipv6_addr_type(addr6); |
| |
| if ((addr_type & IPV6_ADDR_UNICAST) && |
| ipv6_addr_is_isatap(addr6)) |
| dst = addr6->s6_addr32[3]; |
| else |
| do_tx_error = true; |
| |
| neigh_release(neigh); |
| if (do_tx_error) |
| goto tx_error; |
| } |
| |
| if (!dst) |
| dst = try_6rd(tunnel, &iph6->daddr); |
| |
| if (!dst) { |
| struct neighbour *neigh = NULL; |
| bool do_tx_error = false; |
| |
| if (skb_dst(skb)) |
| neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); |
| |
| if (!neigh) { |
| net_dbg_ratelimited("nexthop == NULL\n"); |
| goto tx_error; |
| } |
| |
| addr6 = (const struct in6_addr *)&neigh->primary_key; |
| addr_type = ipv6_addr_type(addr6); |
| |
| if (addr_type == IPV6_ADDR_ANY) { |
| addr6 = &ipv6_hdr(skb)->daddr; |
| addr_type = ipv6_addr_type(addr6); |
| } |
| |
| if ((addr_type & IPV6_ADDR_COMPATv4) != 0) |
| dst = addr6->s6_addr32[3]; |
| else |
| do_tx_error = true; |
| |
| neigh_release(neigh); |
| if (do_tx_error) |
| goto tx_error; |
| } |
| |
| flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, |
| RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, |
| 0, dst, tiph->saddr, 0, 0, |
| sock_net_uid(tunnel->net, NULL)); |
| rt = ip_route_output_flow(tunnel->net, &fl4, NULL); |
| |
| if (IS_ERR(rt)) { |
| dev->stats.tx_carrier_errors++; |
| goto tx_error_icmp; |
| } |
| if (rt->rt_type != RTN_UNICAST) { |
| ip_rt_put(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; |
| } |
| |
| if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { |
| ip_rt_put(rt); |
| goto tx_error; |
| } |
| |
| if (df) { |
| mtu = dst_mtu(&rt->dst) - t_hlen; |
| |
| if (mtu < 68) { |
| dev->stats.collisions++; |
| ip_rt_put(rt); |
| goto tx_error; |
| } |
| |
| if (mtu < IPV6_MIN_MTU) { |
| mtu = IPV6_MIN_MTU; |
| df = 0; |
| } |
| |
| if (tunnel->parms.iph.daddr) |
| skb_dst_update_pmtu(skb, mtu); |
| |
| if (skb->len > mtu && !skb_is_gso(skb)) { |
| icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, 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) + t_hlen; |
| |
| 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++; |
| 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; |
| iph6 = ipv6_hdr(skb); |
| } |
| ttl = tiph->ttl; |
| if (ttl == 0) |
| ttl = iph6->hop_limit; |
| tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); |
| |
| if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { |
| ip_rt_put(rt); |
| goto tx_error; |
| } |
| |
| skb_set_inner_ipproto(skb, IPPROTO_IPV6); |
| |
| iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
| df, !net_eq(tunnel->net, dev_net(dev))); |
| return NETDEV_TX_OK; |
| |
| tx_error_icmp: |
| dst_link_failure(skb); |
| tx_error: |
| kfree_skb(skb); |
| dev->stats.tx_errors++; |
| return NETDEV_TX_OK; |
| } |
| |
| static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, |
| struct net_device *dev, u8 ipproto) |
| { |
| struct ip_tunnel *tunnel = netdev_priv(dev); |
| const struct iphdr *tiph = &tunnel->parms.iph; |
| |
| if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) |
| goto tx_error; |
| |
| skb_set_inner_ipproto(skb, ipproto); |
| |
| ip_tunnel_xmit(skb, dev, tiph, ipproto); |
| return NETDEV_TX_OK; |
| tx_error: |
| kfree_skb(skb); |
| dev->stats.tx_errors++; |
| return NETDEV_TX_OK; |
| } |
| |
| static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, |
| struct net_device *dev) |
| { |
| if (!pskb_inet_may_pull(skb)) |
| goto tx_err; |
| |
| switch (skb->protocol) { |
| case htons(ETH_P_IP): |
| sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); |
| break; |
| case htons(ETH_P_IPV6): |
| ipip6_tunnel_xmit(skb, dev); |
| break; |
| #if IS_ENABLED(CONFIG_MPLS) |
| case htons(ETH_P_MPLS_UC): |
| sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); |
| break; |
| #endif |
| default: |
| goto tx_err; |
| } |
| |
| return NETDEV_TX_OK; |
| |
| tx_err: |
| dev->stats.tx_errors++; |
| kfree_skb(skb); |
| return NETDEV_TX_OK; |
| |
| } |
| |
| static void ipip6_tunnel_bind_dev(struct net_device *dev) |
| { |
| struct net_device *tdev = NULL; |
| struct ip_tunnel *tunnel; |
| const struct iphdr *iph; |
| struct flowi4 fl4; |
| |
| tunnel = netdev_priv(dev); |
| iph = &tunnel->parms.iph; |
| |
| if (iph->daddr) { |
| struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, |
| NULL, |
| iph->daddr, iph->saddr, |
| 0, 0, |
| IPPROTO_IPV6, |
| 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(tunnel->net, tunnel->parms.link); |
| |
| if (tdev && !netif_is_l3_master(tdev)) { |
| int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
| |
| dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); |
| dev->mtu = tdev->mtu - t_hlen; |
| if (dev->mtu < IPV6_MIN_MTU) |
| dev->mtu = IPV6_MIN_MTU; |
| } |
| } |
| |
| static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, |
| __u32 fwmark) |
| { |
| struct net *net = t->net; |
| struct sit_net *sitn = net_generic(net, sit_net_id); |
| |
| ipip6_tunnel_unlink(sitn, t); |
| synchronize_net(); |
| t->parms.iph.saddr = p->iph.saddr; |
| t->parms.iph.daddr = p->iph.daddr; |
| memcpy(t->dev->dev_addr, &p->iph.saddr, 4); |
| memcpy(t->dev->broadcast, &p->iph.daddr, 4); |
| ipip6_tunnel_link(sitn, t); |
| 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->fwmark != fwmark) { |
| t->parms.link = p->link; |
| t->fwmark = fwmark; |
| ipip6_tunnel_bind_dev(t->dev); |
| } |
| dst_cache_reset(&t->dst_cache); |
| netdev_state_change(t->dev); |
| } |
| |
| #ifdef CONFIG_IPV6_SIT_6RD |
| static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, |
| struct ip_tunnel_6rd *ip6rd) |
| { |
| struct in6_addr prefix; |
| __be32 relay_prefix; |
| |
| if (ip6rd->relay_prefixlen > 32 || |
| ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) |
| return -EINVAL; |
| |
| ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); |
| if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) |
| return -EINVAL; |
| if (ip6rd->relay_prefixlen) |
| relay_prefix = ip6rd->relay_prefix & |
| htonl(0xffffffffUL << |
| (32 - ip6rd->relay_prefixlen)); |
| else |
| relay_prefix = 0; |
| if (relay_prefix != ip6rd->relay_prefix) |
| return -EINVAL; |
| |
| t->ip6rd.prefix = prefix; |
| t->ip6rd.relay_prefix = relay_prefix; |
| t->ip6rd.prefixlen = ip6rd->prefixlen; |
| t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; |
| dst_cache_reset(&t->dst_cache); |
| netdev_state_change(t->dev); |
| return 0; |
| } |
| #endif |
| |
| static bool ipip6_valid_ip_proto(u8 ipproto) |
| { |
| return ipproto == IPPROTO_IPV6 || |
| ipproto == IPPROTO_IPIP || |
| #if IS_ENABLED(CONFIG_MPLS) |
| ipproto == IPPROTO_MPLS || |
| #endif |
| ipproto == 0; |
| } |
| |
| static int |
| ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| { |
| int err = 0; |
| struct ip_tunnel_parm p; |
| struct ip_tunnel_prl prl; |
| struct ip_tunnel *t = netdev_priv(dev); |
| struct net *net = t->net; |
| struct sit_net *sitn = net_generic(net, sit_net_id); |
| #ifdef CONFIG_IPV6_SIT_6RD |
| struct ip_tunnel_6rd ip6rd; |
| #endif |
| |
| switch (cmd) { |
| case SIOCGETTUNNEL: |
| #ifdef CONFIG_IPV6_SIT_6RD |
| case SIOCGET6RD: |
| #endif |
| if (dev == sitn->fb_tunnel_dev) { |
| if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| err = -EFAULT; |
| break; |
| } |
| t = ipip6_tunnel_locate(net, &p, 0); |
| if (!t) |
| t = netdev_priv(dev); |
| } |
| |
| err = -EFAULT; |
| if (cmd == SIOCGETTUNNEL) { |
| memcpy(&p, &t->parms, sizeof(p)); |
| if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, |
| sizeof(p))) |
| goto done; |
| #ifdef CONFIG_IPV6_SIT_6RD |
| } else { |
| ip6rd.prefix = t->ip6rd.prefix; |
| ip6rd.relay_prefix = t->ip6rd.relay_prefix; |
| ip6rd.prefixlen = t->ip6rd.prefixlen; |
| ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; |
| if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, |
| sizeof(ip6rd))) |
| goto done; |
| #endif |
| } |
| err = 0; |
| break; |
| |
| case SIOCADDTUNNEL: |
| case SIOCCHGTUNNEL: |
| err = -EPERM; |
| if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| goto done; |
| |
| err = -EFAULT; |
| if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| goto done; |
| |
| err = -EINVAL; |
| if (!ipip6_valid_ip_proto(p.iph.protocol)) |
| goto done; |
| if (p.iph.version != 4 || |
| 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 = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
| |
| if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
| if (t) { |
| 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); |
| } |
| |
| ipip6_tunnel_update(t, &p, t->fwmark); |
| } |
| |
| if (t) { |
| err = 0; |
| 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 (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| goto done; |
| |
| if (dev == sitn->fb_tunnel_dev) { |
| err = -EFAULT; |
| if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| goto done; |
| err = -ENOENT; |
| t = ipip6_tunnel_locate(net, &p, 0); |
| if (!t) |
| goto done; |
| err = -EPERM; |
| if (t == netdev_priv(sitn->fb_tunnel_dev)) |
| goto done; |
| dev = t->dev; |
| } |
| unregister_netdevice(dev); |
| err = 0; |
| break; |
| |
| case SIOCGETPRL: |
| err = -EINVAL; |
| if (dev == sitn->fb_tunnel_dev) |
| goto done; |
| err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); |
| break; |
| |
| case SIOCADDPRL: |
| case SIOCDELPRL: |
| case SIOCCHGPRL: |
| err = -EPERM; |
| if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| goto done; |
| err = -EINVAL; |
| if (dev == sitn->fb_tunnel_dev) |
| goto done; |
| err = -EFAULT; |
| if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) |
| goto done; |
| |
| switch (cmd) { |
| case SIOCDELPRL: |
| err = ipip6_tunnel_del_prl(t, &prl); |
| break; |
| case SIOCADDPRL: |
| case SIOCCHGPRL: |
| err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
| break; |
| } |
| dst_cache_reset(&t->dst_cache); |
| netdev_state_change(dev); |
| break; |
| |
| #ifdef CONFIG_IPV6_SIT_6RD |
| case SIOCADD6RD: |
| case SIOCCHG6RD: |
| case SIOCDEL6RD: |
| err = -EPERM; |
| if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| goto done; |
| |
| err = -EFAULT; |
| if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, |
| sizeof(ip6rd))) |
| goto done; |
| |
| if (cmd != SIOCDEL6RD) { |
| err = ipip6_tunnel_update_6rd(t, &ip6rd); |
| if (err < 0) |
| goto done; |
| } else |
| ipip6_tunnel_clone_6rd(dev, sitn); |
| |
| err = 0; |
| break; |
| #endif |
| |
| default: |
| err = -EINVAL; |
| } |
| |
| done: |
| return err; |
| } |
| |
| static const struct net_device_ops ipip6_netdev_ops = { |
| .ndo_init = ipip6_tunnel_init, |
| .ndo_uninit = ipip6_tunnel_uninit, |
| .ndo_start_xmit = sit_tunnel_xmit, |
| .ndo_do_ioctl = ipip6_tunnel_ioctl, |
| .ndo_get_stats64 = ip_tunnel_get_stats64, |
| .ndo_get_iflink = ip_tunnel_get_iflink, |
| }; |
| |
| static void ipip6_dev_free(struct net_device *dev) |
| { |
| struct ip_tunnel *tunnel = netdev_priv(dev); |
| |
| dst_cache_destroy(&tunnel->dst_cache); |
| free_percpu(dev->tstats); |
| } |
| |
| #define SIT_FEATURES (NETIF_F_SG | \ |
| NETIF_F_FRAGLIST | \ |
| NETIF_F_HIGHDMA | \ |
| NETIF_F_GSO_SOFTWARE | \ |
| NETIF_F_HW_CSUM) |
| |
| static void ipip6_tunnel_setup(struct net_device *dev) |
| { |
| struct ip_tunnel *tunnel = netdev_priv(dev); |
| int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
| |
| dev->netdev_ops = &ipip6_netdev_ops; |
| dev->needs_free_netdev = true; |
| dev->priv_destructor = ipip6_dev_free; |
| |
| dev->type = ARPHRD_SIT; |
| dev->hard_header_len = LL_MAX_HEADER + t_hlen; |
| dev->mtu = ETH_DATA_LEN - t_hlen; |
| dev->min_mtu = IPV6_MIN_MTU; |
| dev->max_mtu = IP6_MAX_MTU - t_hlen; |
| dev->flags = IFF_NOARP; |
| netif_keep_dst(dev); |
| dev->addr_len = 4; |
| dev->features |= NETIF_F_LLTX; |
| dev->features |= SIT_FEATURES; |
| dev->hw_features |= SIT_FEATURES; |
| } |
| |
| static int ipip6_tunnel_init(struct net_device *dev) |
| { |
| struct ip_tunnel *tunnel = netdev_priv(dev); |
| int err; |
| |
| tunnel->dev = dev; |
| tunnel->net = dev_net(dev); |
| strcpy(tunnel->parms.name, dev->name); |
| |
| ipip6_tunnel_bind_dev(dev); |
| dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| if (!dev->tstats) |
| return -ENOMEM; |
| |
| err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
| if (err) { |
| free_percpu(dev->tstats); |
| dev->tstats = NULL; |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) |
| { |
| struct ip_tunnel *tunnel = netdev_priv(dev); |
| struct iphdr *iph = &tunnel->parms.iph; |
| struct net *net = dev_net(dev); |
| struct sit_net *sitn = net_generic(net, sit_net_id); |
| |
| iph->version = 4; |
| iph->protocol = IPPROTO_IPV6; |
| iph->ihl = 5; |
| iph->ttl = 64; |
| |
| dev_hold(dev); |
| rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); |
| } |
| |
| static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| u8 proto; |
| |
| if (!data || !data[IFLA_IPTUN_PROTO]) |
| return 0; |
| |
| proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); |
| if (!ipip6_valid_ip_proto(proto)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static void ipip6_netlink_parms(struct nlattr *data[], |
| struct ip_tunnel_parm *parms, |
| __u32 *fwmark) |
| { |
| memset(parms, 0, sizeof(*parms)); |
| |
| parms->iph.version = 4; |
| parms->iph.protocol = IPPROTO_IPV6; |
| parms->iph.ihl = 5; |
| parms->iph.ttl = 64; |
| |
| if (!data) |
| return; |
| |
| if (data[IFLA_IPTUN_LINK]) |
| parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); |
| |
| if (data[IFLA_IPTUN_LOCAL]) |
| parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); |
| |
| if (data[IFLA_IPTUN_REMOTE]) |
| parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); |
| |
| if (data[IFLA_IPTUN_TTL]) { |
| parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); |
| if (parms->iph.ttl) |
| parms->iph.frag_off = htons(IP_DF); |
| } |
| |
| if (data[IFLA_IPTUN_TOS]) |
| parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); |
| |
| if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) |
| parms->iph.frag_off = htons(IP_DF); |
| |
| if (data[IFLA_IPTUN_FLAGS]) |
| parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); |
| |
| if (data[IFLA_IPTUN_PROTO]) |
| parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); |
| |
| if (data[IFLA_IPTUN_FWMARK]) |
| *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); |
| } |
| |
| /* This function returns true when ENCAP attributes are present in the nl msg */ |
| static bool ipip6_netlink_encap_parms(struct nlattr *data[], |
| struct ip_tunnel_encap *ipencap) |
| { |
| bool ret = false; |
| |
| memset(ipencap, 0, sizeof(*ipencap)); |
| |
| if (!data) |
| return ret; |
| |
| if (data[IFLA_IPTUN_ENCAP_TYPE]) { |
| ret = true; |
| ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); |
| } |
| |
| if (data[IFLA_IPTUN_ENCAP_FLAGS]) { |
| ret = true; |
| ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); |
| } |
| |
| if (data[IFLA_IPTUN_ENCAP_SPORT]) { |
| ret = true; |
| ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
| } |
| |
| if (data[IFLA_IPTUN_ENCAP_DPORT]) { |
| ret = true; |
| ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
| } |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_IPV6_SIT_6RD |
| /* This function returns true when 6RD attributes are present in the nl msg */ |
| static bool ipip6_netlink_6rd_parms(struct nlattr *data[], |
| struct ip_tunnel_6rd *ip6rd) |
| { |
| bool ret = false; |
| memset(ip6rd, 0, sizeof(*ip6rd)); |
| |
| if (!data) |
| return ret; |
| |
| if (data[IFLA_IPTUN_6RD_PREFIX]) { |
| ret = true; |
| ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); |
| } |
| |
| if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { |
| ret = true; |
| ip6rd->relay_prefix = |
| nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); |
| } |
| |
| if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { |
| ret = true; |
| ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); |
| } |
| |
| if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { |
| ret = true; |
| ip6rd->relay_prefixlen = |
| nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); |
| } |
| |
| return ret; |
| } |
| #endif |
| |
| static int ipip6_newlink(struct net *src_net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct net *net = dev_net(dev); |
| struct ip_tunnel *nt; |
| struct ip_tunnel_encap ipencap; |
| #ifdef CONFIG_IPV6_SIT_6RD |
| struct ip_tunnel_6rd ip6rd; |
| #endif |
| int err; |
| |
| nt = netdev_priv(dev); |
| |
| if (ipip6_netlink_encap_parms(data, &ipencap)) { |
| err = ip_tunnel_encap_setup(nt, &ipencap); |
| if (err < 0) |
| return err; |
| } |
| |
| ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); |
| |
| if (ipip6_tunnel_locate(net, &nt->parms, 0)) |
| return -EEXIST; |
| |
| err = ipip6_tunnel_create(dev); |
| if (err < 0) |
| return err; |
| |
| if (tb[IFLA_MTU]) { |
| u32 mtu = nla_get_u32(tb[IFLA_MTU]); |
| |
| if (mtu >= IPV6_MIN_MTU && |
| mtu <= IP6_MAX_MTU - dev->hard_header_len) |
| dev->mtu = mtu; |
| } |
| |
| #ifdef CONFIG_IPV6_SIT_6RD |
| if (ipip6_netlink_6rd_parms(data, &ip6rd)) |
| err = ipip6_tunnel_update_6rd(nt, &ip6rd); |
| #endif |
| |
| return err; |
| } |
| |
| static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], |
| struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct ip_tunnel *t = netdev_priv(dev); |
| struct ip_tunnel_parm p; |
| struct ip_tunnel_encap ipencap; |
| struct net *net = t->net; |
| struct sit_net *sitn = net_generic(net, sit_net_id); |
| #ifdef CONFIG_IPV6_SIT_6RD |
| struct ip_tunnel_6rd ip6rd; |
| #endif |
| __u32 fwmark = t->fwmark; |
| int err; |
| |
| if (dev == sitn->fb_tunnel_dev) |
| return -EINVAL; |
| |
| if (ipip6_netlink_encap_parms(data, &ipencap)) { |
| err = ip_tunnel_encap_setup(t, &ipencap); |
| if (err < 0) |
| return err; |
| } |
| |
| ipip6_netlink_parms(data, &p, &fwmark); |
| |
| if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || |
| (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) |
| return -EINVAL; |
| |
| t = ipip6_tunnel_locate(net, &p, 0); |
| |
| if (t) { |
| if (t->dev != dev) |
| return -EEXIST; |
| } else |
| t = netdev_priv(dev); |
| |
| ipip6_tunnel_update(t, &p, fwmark); |
| |
| #ifdef CONFIG_IPV6_SIT_6RD |
| if (ipip6_netlink_6rd_parms(data, &ip6rd)) |
| return ipip6_tunnel_update_6rd(t, &ip6rd); |
| #endif |
| |
| return 0; |
| } |
| |
| static size_t ipip6_get_size(const struct net_device *dev) |
| { |
| return |
| /* IFLA_IPTUN_LINK */ |
| nla_total_size(4) + |
| /* IFLA_IPTUN_LOCAL */ |
| nla_total_size(4) + |
| /* IFLA_IPTUN_REMOTE */ |
| nla_total_size(4) + |
| /* IFLA_IPTUN_TTL */ |
| nla_total_size(1) + |
| /* IFLA_IPTUN_TOS */ |
| nla_total_size(1) + |
| /* IFLA_IPTUN_PMTUDISC */ |
| nla_total_size(1) + |
| /* IFLA_IPTUN_FLAGS */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_PROTO */ |
| nla_total_size(1) + |
| #ifdef CONFIG_IPV6_SIT_6RD |
| /* IFLA_IPTUN_6RD_PREFIX */ |
| nla_total_size(sizeof(struct in6_addr)) + |
| /* IFLA_IPTUN_6RD_RELAY_PREFIX */ |
| nla_total_size(4) + |
| /* IFLA_IPTUN_6RD_PREFIXLEN */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ |
| nla_total_size(2) + |
| #endif |
| /* IFLA_IPTUN_ENCAP_TYPE */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_ENCAP_FLAGS */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_ENCAP_SPORT */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_ENCAP_DPORT */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_FWMARK */ |
| nla_total_size(4) + |
| 0; |
| } |
| |
| static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| { |
| struct ip_tunnel *tunnel = netdev_priv(dev); |
| struct ip_tunnel_parm *parm = &tunnel->parms; |
| |
| if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || |
| nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || |
| nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || |
| nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || |
| nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || |
| nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, |
| !!(parm->iph.frag_off & htons(IP_DF))) || |
| nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || |
| nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || |
| nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) |
| goto nla_put_failure; |
| |
| #ifdef CONFIG_IPV6_SIT_6RD |
| if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, |
| &tunnel->ip6rd.prefix) || |
| nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, |
| tunnel->ip6rd.relay_prefix) || |
| nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, |
| tunnel->ip6rd.prefixlen) || |
| nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, |
| tunnel->ip6rd.relay_prefixlen)) |
| goto nla_put_failure; |
| #endif |
| |
| if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, |
| tunnel->encap.type) || |
| nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, |
| tunnel->encap.sport) || |
| nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, |
| tunnel->encap.dport) || |
| nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, |
| tunnel->encap.flags)) |
| goto nla_put_failure; |
| |
| return 0; |
| |
| nla_put_failure: |
| return -EMSGSIZE; |
| } |
| |
| static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { |
| [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, |
| [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, |
| [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, |
| [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, |
| [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, |
| [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, |
| [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
| #ifdef CONFIG_IPV6_SIT_6RD |
| [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, |
| [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, |
| [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, |
| #endif |
| [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
| }; |
| |
| static void ipip6_dellink(struct net_device *dev, struct list_head *head) |
| { |
| struct net *net = dev_net(dev); |
| struct sit_net *sitn = net_generic(net, sit_net_id); |
| |
| if (dev != sitn->fb_tunnel_dev) |
| unregister_netdevice_queue(dev, head); |
| } |
| |
| static struct rtnl_link_ops sit_link_ops __read_mostly = { |
| .kind = "sit", |
| .maxtype = IFLA_IPTUN_MAX, |
| .policy = ipip6_policy, |
| .priv_size = sizeof(struct ip_tunnel), |
| .setup = ipip6_tunnel_setup, |
| .validate = ipip6_validate, |
| .newlink = ipip6_newlink, |
| .changelink = ipip6_changelink, |
| .get_size = ipip6_get_size, |
| .fill_info = ipip6_fill_info, |
| .dellink = ipip6_dellink, |
| .get_link_net = ip_tunnel_get_link_net, |
| }; |
| |
| static struct xfrm_tunnel sit_handler __read_mostly = { |
| .handler = ipip6_rcv, |
| .err_handler = ipip6_err, |
| .priority = 1, |
| }; |
| |
| static struct xfrm_tunnel ipip_handler __read_mostly = { |
| .handler = ipip_rcv, |
| .err_handler = ipip6_err, |
| .priority = 2, |
| }; |
| |
| #if IS_ENABLED(CONFIG_MPLS) |
| static struct xfrm_tunnel mplsip_handler __read_mostly = { |
| .handler = mplsip_rcv, |
| .err_handler = ipip6_err, |
| .priority = 2, |
| }; |
| #endif |
| |
| static void __net_exit sit_destroy_tunnels(struct net *net, |
| struct list_head *head) |
| { |
| struct sit_net *sitn = net_generic(net, sit_net_id); |
| struct net_device *dev, *aux; |
| int prio; |
| |
| for_each_netdev_safe(net, dev, aux) |
| if (dev->rtnl_link_ops == &sit_link_ops) |
| unregister_netdevice_queue(dev, head); |
| |
| for (prio = 1; prio < 4; prio++) { |
| int h; |
| for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { |
| struct ip_tunnel *t; |
| |
| t = rtnl_dereference(sitn->tunnels[prio][h]); |
| while (t) { |
| /* If dev is in the same netns, it has already |
| * been added to the list by the previous loop. |
| */ |
| if (!net_eq(dev_net(t->dev), net)) |
| unregister_netdevice_queue(t->dev, |
| head); |
| t = rtnl_dereference(t->next); |
| } |
| } |
| } |
| } |
| |
| static int __net_init sit_init_net(struct net *net) |
| { |
| struct sit_net *sitn = net_generic(net, sit_net_id); |
| struct ip_tunnel *t; |
| int err; |
| |
| sitn->tunnels[0] = sitn->tunnels_wc; |
| sitn->tunnels[1] = sitn->tunnels_l; |
| sitn->tunnels[2] = sitn->tunnels_r; |
| sitn->tunnels[3] = sitn->tunnels_r_l; |
| |
| if (!net_has_fallback_tunnels(net)) |
| return 0; |
| |
| sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
| NET_NAME_UNKNOWN, |
| ipip6_tunnel_setup); |
| if (!sitn->fb_tunnel_dev) { |
| err = -ENOMEM; |
| goto err_alloc_dev; |
| } |
| dev_net_set(sitn->fb_tunnel_dev, net); |
| sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; |
| /* FB netdevice is special: we have one, and only one per netns. |
| * Allowing to move it to another netns is clearly unsafe. |
| */ |
| sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
| |
| err = register_netdev(sitn->fb_tunnel_dev); |
| if (err) |
| goto err_reg_dev; |
| |
| ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); |
| ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
| |
| t = netdev_priv(sitn->fb_tunnel_dev); |
| |
| strcpy(t->parms.name, sitn->fb_tunnel_dev->name); |
| return 0; |
| |
| err_reg_dev: |
| ipip6_dev_free(sitn->fb_tunnel_dev); |
| free_netdev(sitn->fb_tunnel_dev); |
| err_alloc_dev: |
| return err; |
| } |
| |
| static void __net_exit sit_exit_batch_net(struct list_head *net_list) |
| { |
| LIST_HEAD(list); |
| struct net *net; |
| |
| rtnl_lock(); |
| list_for_each_entry(net, net_list, exit_list) |
| sit_destroy_tunnels(net, &list); |
| |
| unregister_netdevice_many(&list); |
| rtnl_unlock(); |
| } |
| |
| static struct pernet_operations sit_net_ops = { |
| .init = sit_init_net, |
| .exit_batch = sit_exit_batch_net, |
| .id = &sit_net_id, |
| .size = sizeof(struct sit_net), |
| }; |
| |
| static void __exit sit_cleanup(void) |
| { |
| rtnl_link_unregister(&sit_link_ops); |
| xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
| xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
| #if IS_ENABLED(CONFIG_MPLS) |
| xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); |
| #endif |
| |
| unregister_pernet_device(&sit_net_ops); |
| rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
| } |
| |
| static int __init sit_init(void) |
| { |
| int err; |
| |
| pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); |
| |
| err = register_pernet_device(&sit_net_ops); |
| if (err < 0) |
| return err; |
| err = xfrm4_tunnel_register(&sit_handler, AF_INET6); |
| if (err < 0) { |
| pr_info("%s: can't register ip6ip4\n", __func__); |
| goto xfrm_tunnel_failed; |
| } |
| err = xfrm4_tunnel_register(&ipip_handler, AF_INET); |
| if (err < 0) { |
| pr_info("%s: can't register ip4ip4\n", __func__); |
| goto xfrm_tunnel4_failed; |
| } |
| #if IS_ENABLED(CONFIG_MPLS) |
| err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); |
| if (err < 0) { |
| pr_info("%s: can't register mplsip\n", __func__); |
| goto xfrm_tunnel_mpls_failed; |
| } |
| #endif |
| err = rtnl_link_register(&sit_link_ops); |
| if (err < 0) |
| goto rtnl_link_failed; |
| |
| out: |
| return err; |
| |
| rtnl_link_failed: |
| #if IS_ENABLED(CONFIG_MPLS) |
| xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); |
| xfrm_tunnel_mpls_failed: |
| #endif |
| xfrm4_tunnel_deregister(&ipip_handler, AF_INET); |
| xfrm_tunnel4_failed: |
| xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
| xfrm_tunnel_failed: |
| unregister_pernet_device(&sit_net_ops); |
| goto out; |
| } |
| |
| module_init(sit_init); |
| module_exit(sit_cleanup); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_RTNL_LINK("sit"); |
| MODULE_ALIAS_NETDEV("sit0"); |