| /* |
| * GRE over IPv6 protocol decoder. |
| * |
| * Authors: Dmitry Kozlov (xeb@mail.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. |
| * |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/capability.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/uaccess.h> |
| #include <linux/skbuff.h> |
| #include <linux/netdevice.h> |
| #include <linux/in.h> |
| #include <linux/tcp.h> |
| #include <linux/udp.h> |
| #include <linux/if_arp.h> |
| #include <linux/mroute.h> |
| #include <linux/init.h> |
| #include <linux/in6.h> |
| #include <linux/inetdevice.h> |
| #include <linux/igmp.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <linux/etherdevice.h> |
| #include <linux/if_ether.h> |
| #include <linux/hash.h> |
| #include <linux/if_tunnel.h> |
| #include <linux/ip6_tunnel.h> |
| |
| #include <net/sock.h> |
| #include <net/ip.h> |
| #include <net/ip_tunnels.h> |
| #include <net/icmp.h> |
| #include <net/protocol.h> |
| #include <net/addrconf.h> |
| #include <net/arp.h> |
| #include <net/checksum.h> |
| #include <net/dsfield.h> |
| #include <net/inet_ecn.h> |
| #include <net/xfrm.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| #include <net/rtnetlink.h> |
| |
| #include <net/ipv6.h> |
| #include <net/ip6_fib.h> |
| #include <net/ip6_route.h> |
| #include <net/ip6_tunnel.h> |
| |
| |
| 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"); |
| |
| #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) |
| #define IPV6_TCLASS_SHIFT 20 |
| |
| #define HASH_SIZE_SHIFT 5 |
| #define HASH_SIZE (1 << HASH_SIZE_SHIFT) |
| |
| static int ip6gre_net_id __read_mostly; |
| struct ip6gre_net { |
| struct ip6_tnl __rcu *tunnels[4][HASH_SIZE]; |
| |
| struct net_device *fb_tunnel_dev; |
| }; |
| |
| static struct rtnl_link_ops ip6gre_link_ops __read_mostly; |
| static int ip6gre_tunnel_init(struct net_device *dev); |
| static void ip6gre_tunnel_setup(struct net_device *dev); |
| static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); |
| static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); |
| |
| /* Tunnel hash table */ |
| |
| /* |
| 4 hash tables: |
| |
| 3: (remote,local) |
| 2: (remote,*) |
| 1: (*,local) |
| 0: (*,*) |
| |
| We require exact key match i.e. if a key is present in packet |
| it will match only tunnel with the same key; if it is not present, |
| it will match only keyless tunnel. |
| |
| All keysless packets, if not matched configured keyless tunnels |
| will match fallback tunnel. |
| */ |
| |
| #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1)) |
| static u32 HASH_ADDR(const struct in6_addr *addr) |
| { |
| u32 hash = ipv6_addr_hash(addr); |
| |
| return hash_32(hash, HASH_SIZE_SHIFT); |
| } |
| |
| #define tunnels_r_l tunnels[3] |
| #define tunnels_r tunnels[2] |
| #define tunnels_l tunnels[1] |
| #define tunnels_wc tunnels[0] |
| |
| /* Given src, dst and key, find appropriate for input tunnel. */ |
| |
| static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, |
| const struct in6_addr *remote, const struct in6_addr *local, |
| __be32 key, __be16 gre_proto) |
| { |
| struct net *net = dev_net(dev); |
| int link = dev->ifindex; |
| unsigned int h0 = HASH_ADDR(remote); |
| unsigned int h1 = HASH_KEY(key); |
| struct ip6_tnl *t, *cand = NULL; |
| struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
| int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
| ARPHRD_ETHER : ARPHRD_IP6GRE; |
| int score, cand_score = 4; |
| |
| for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { |
| if (!ipv6_addr_equal(local, &t->parms.laddr) || |
| !ipv6_addr_equal(remote, &t->parms.raddr) || |
| key != t->parms.i_key || |
| !(t->dev->flags & IFF_UP)) |
| continue; |
| |
| if (t->dev->type != ARPHRD_IP6GRE && |
| t->dev->type != dev_type) |
| continue; |
| |
| score = 0; |
| if (t->parms.link != link) |
| score |= 1; |
| if (t->dev->type != dev_type) |
| score |= 2; |
| if (score == 0) |
| return t; |
| |
| if (score < cand_score) { |
| cand = t; |
| cand_score = score; |
| } |
| } |
| |
| for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { |
| if (!ipv6_addr_equal(remote, &t->parms.raddr) || |
| key != t->parms.i_key || |
| !(t->dev->flags & IFF_UP)) |
| continue; |
| |
| if (t->dev->type != ARPHRD_IP6GRE && |
| t->dev->type != dev_type) |
| continue; |
| |
| score = 0; |
| if (t->parms.link != link) |
| score |= 1; |
| if (t->dev->type != dev_type) |
| score |= 2; |
| if (score == 0) |
| return t; |
| |
| if (score < cand_score) { |
| cand = t; |
| cand_score = score; |
| } |
| } |
| |
| for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { |
| if ((!ipv6_addr_equal(local, &t->parms.laddr) && |
| (!ipv6_addr_equal(local, &t->parms.raddr) || |
| !ipv6_addr_is_multicast(local))) || |
| key != t->parms.i_key || |
| !(t->dev->flags & IFF_UP)) |
| continue; |
| |
| if (t->dev->type != ARPHRD_IP6GRE && |
| t->dev->type != dev_type) |
| continue; |
| |
| score = 0; |
| if (t->parms.link != link) |
| score |= 1; |
| if (t->dev->type != dev_type) |
| score |= 2; |
| if (score == 0) |
| return t; |
| |
| if (score < cand_score) { |
| cand = t; |
| cand_score = score; |
| } |
| } |
| |
| for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { |
| if (t->parms.i_key != key || |
| !(t->dev->flags & IFF_UP)) |
| continue; |
| |
| if (t->dev->type != ARPHRD_IP6GRE && |
| t->dev->type != dev_type) |
| continue; |
| |
| score = 0; |
| if (t->parms.link != link) |
| score |= 1; |
| if (t->dev->type != dev_type) |
| score |= 2; |
| if (score == 0) |
| return t; |
| |
| if (score < cand_score) { |
| cand = t; |
| cand_score = score; |
| } |
| } |
| |
| if (cand != NULL) |
| return cand; |
| |
| dev = ign->fb_tunnel_dev; |
| if (dev->flags & IFF_UP) |
| return netdev_priv(dev); |
| |
| return NULL; |
| } |
| |
| static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, |
| const struct __ip6_tnl_parm *p) |
| { |
| const struct in6_addr *remote = &p->raddr; |
| const struct in6_addr *local = &p->laddr; |
| unsigned int h = HASH_KEY(p->i_key); |
| int prio = 0; |
| |
| if (!ipv6_addr_any(local)) |
| prio |= 1; |
| if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { |
| prio |= 2; |
| h ^= HASH_ADDR(remote); |
| } |
| |
| return &ign->tunnels[prio][h]; |
| } |
| |
| static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, |
| const struct ip6_tnl *t) |
| { |
| return __ip6gre_bucket(ign, &t->parms); |
| } |
| |
| static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) |
| { |
| struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); |
| |
| rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
| rcu_assign_pointer(*tp, t); |
| } |
| |
| static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) |
| { |
| struct ip6_tnl __rcu **tp; |
| struct ip6_tnl *iter; |
| |
| for (tp = ip6gre_bucket(ign, t); |
| (iter = rtnl_dereference(*tp)) != NULL; |
| tp = &iter->next) { |
| if (t == iter) { |
| rcu_assign_pointer(*tp, t->next); |
| break; |
| } |
| } |
| } |
| |
| static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, |
| const struct __ip6_tnl_parm *parms, |
| int type) |
| { |
| const struct in6_addr *remote = &parms->raddr; |
| const struct in6_addr *local = &parms->laddr; |
| __be32 key = parms->i_key; |
| int link = parms->link; |
| struct ip6_tnl *t; |
| struct ip6_tnl __rcu **tp; |
| struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
| |
| for (tp = __ip6gre_bucket(ign, parms); |
| (t = rtnl_dereference(*tp)) != NULL; |
| tp = &t->next) |
| if (ipv6_addr_equal(local, &t->parms.laddr) && |
| ipv6_addr_equal(remote, &t->parms.raddr) && |
| key == t->parms.i_key && |
| link == t->parms.link && |
| type == t->dev->type) |
| break; |
| |
| return t; |
| } |
| |
| static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, |
| const struct __ip6_tnl_parm *parms, int create) |
| { |
| struct ip6_tnl *t, *nt; |
| struct net_device *dev; |
| char name[IFNAMSIZ]; |
| struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
| |
| t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); |
| if (t || !create) |
| return t; |
| |
| if (parms->name[0]) |
| strlcpy(name, parms->name, IFNAMSIZ); |
| else |
| strcpy(name, "ip6gre%d"); |
| |
| dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup); |
| if (!dev) |
| return NULL; |
| |
| dev_net_set(dev, net); |
| |
| nt = netdev_priv(dev); |
| nt->parms = *parms; |
| dev->rtnl_link_ops = &ip6gre_link_ops; |
| |
| nt->dev = dev; |
| ip6gre_tnl_link_config(nt, 1); |
| |
| if (register_netdevice(dev) < 0) |
| goto failed_free; |
| |
| /* Can use a lockless transmit, unless we generate output sequences */ |
| if (!(nt->parms.o_flags & GRE_SEQ)) |
| dev->features |= NETIF_F_LLTX; |
| |
| dev_hold(dev); |
| ip6gre_tunnel_link(ign, nt); |
| return nt; |
| |
| failed_free: |
| free_netdev(dev); |
| return NULL; |
| } |
| |
| static void ip6gre_tunnel_uninit(struct net_device *dev) |
| { |
| struct net *net = dev_net(dev); |
| struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
| |
| ip6gre_tunnel_unlink(ign, netdev_priv(dev)); |
| dev_put(dev); |
| } |
| |
| |
| static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| u8 type, u8 code, int offset, __be32 info) |
| { |
| const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; |
| __be16 *p = (__be16 *)(skb->data + offset); |
| int grehlen = offset + 4; |
| struct ip6_tnl *t; |
| __be16 flags; |
| |
| flags = p[0]; |
| if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { |
| if (flags&(GRE_VERSION|GRE_ROUTING)) |
| return; |
| if (flags&GRE_KEY) { |
| grehlen += 4; |
| if (flags&GRE_CSUM) |
| grehlen += 4; |
| } |
| } |
| |
| /* If only 8 bytes returned, keyed message will be dropped here */ |
| if (!pskb_may_pull(skb, grehlen)) |
| return; |
| ipv6h = (const struct ipv6hdr *)skb->data; |
| p = (__be16 *)(skb->data + offset); |
| |
| t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, |
| flags & GRE_KEY ? |
| *(((__be32 *)p) + (grehlen / 4) - 1) : 0, |
| p[1]); |
| if (t == NULL) |
| return; |
| |
| switch (type) { |
| __u32 teli; |
| struct ipv6_tlv_tnl_enc_lim *tel; |
| __u32 mtu; |
| case ICMPV6_DEST_UNREACH: |
| net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", |
| t->parms.name); |
| break; |
| case ICMPV6_TIME_EXCEED: |
| if (code == ICMPV6_EXC_HOPLIMIT) { |
| net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
| t->parms.name); |
| } |
| break; |
| case ICMPV6_PARAMPROB: |
| teli = 0; |
| if (code == ICMPV6_HDR_FIELD) |
| teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
| |
| if (teli && teli == info - 2) { |
| tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
| if (tel->encap_limit == 0) { |
| net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
| t->parms.name); |
| } |
| } else { |
| net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
| t->parms.name); |
| } |
| break; |
| case ICMPV6_PKT_TOOBIG: |
| mtu = info - offset; |
| if (mtu < IPV6_MIN_MTU) |
| mtu = IPV6_MIN_MTU; |
| t->dev->mtu = mtu; |
| break; |
| } |
| |
| if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) |
| t->err_count++; |
| else |
| t->err_count = 1; |
| t->err_time = jiffies; |
| } |
| |
| static int ip6gre_rcv(struct sk_buff *skb) |
| { |
| const struct ipv6hdr *ipv6h; |
| u8 *h; |
| __be16 flags; |
| __sum16 csum = 0; |
| __be32 key = 0; |
| u32 seqno = 0; |
| struct ip6_tnl *tunnel; |
| int offset = 4; |
| __be16 gre_proto; |
| int err; |
| |
| if (!pskb_may_pull(skb, sizeof(struct in6_addr))) |
| goto drop; |
| |
| ipv6h = ipv6_hdr(skb); |
| h = skb->data; |
| flags = *(__be16 *)h; |
| |
| if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { |
| /* - Version must be 0. |
| - We do not support routing headers. |
| */ |
| if (flags&(GRE_VERSION|GRE_ROUTING)) |
| goto drop; |
| |
| if (flags&GRE_CSUM) { |
| switch (skb->ip_summed) { |
| case CHECKSUM_COMPLETE: |
| csum = csum_fold(skb->csum); |
| if (!csum) |
| break; |
| /* fall through */ |
| case CHECKSUM_NONE: |
| skb->csum = 0; |
| csum = __skb_checksum_complete(skb); |
| skb->ip_summed = CHECKSUM_COMPLETE; |
| } |
| offset += 4; |
| } |
| if (flags&GRE_KEY) { |
| key = *(__be32 *)(h + offset); |
| offset += 4; |
| } |
| if (flags&GRE_SEQ) { |
| seqno = ntohl(*(__be32 *)(h + offset)); |
| offset += 4; |
| } |
| } |
| |
| gre_proto = *(__be16 *)(h + 2); |
| |
| tunnel = ip6gre_tunnel_lookup(skb->dev, |
| &ipv6h->saddr, &ipv6h->daddr, key, |
| gre_proto); |
| if (tunnel) { |
| struct pcpu_tstats *tstats; |
| |
| if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| goto drop; |
| |
| if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) { |
| tunnel->dev->stats.rx_dropped++; |
| goto drop; |
| } |
| |
| secpath_reset(skb); |
| |
| skb->protocol = gre_proto; |
| /* WCCP version 1 and 2 protocol decoding. |
| * - Change protocol to IP |
| * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header |
| */ |
| if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
| skb->protocol = htons(ETH_P_IP); |
| if ((*(h + offset) & 0xF0) != 0x40) |
| offset += 4; |
| } |
| |
| skb->mac_header = skb->network_header; |
| __pskb_pull(skb, offset); |
| skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
| skb->pkt_type = PACKET_HOST; |
| |
| if (((flags&GRE_CSUM) && csum) || |
| (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { |
| tunnel->dev->stats.rx_crc_errors++; |
| tunnel->dev->stats.rx_errors++; |
| goto drop; |
| } |
| if (tunnel->parms.i_flags&GRE_SEQ) { |
| if (!(flags&GRE_SEQ) || |
| (tunnel->i_seqno && |
| (s32)(seqno - tunnel->i_seqno) < 0)) { |
| tunnel->dev->stats.rx_fifo_errors++; |
| tunnel->dev->stats.rx_errors++; |
| goto drop; |
| } |
| tunnel->i_seqno = seqno + 1; |
| } |
| |
| /* Warning: All skb pointers will be invalidated! */ |
| if (tunnel->dev->type == ARPHRD_ETHER) { |
| if (!pskb_may_pull(skb, ETH_HLEN)) { |
| tunnel->dev->stats.rx_length_errors++; |
| tunnel->dev->stats.rx_errors++; |
| goto drop; |
| } |
| |
| ipv6h = ipv6_hdr(skb); |
| skb->protocol = eth_type_trans(skb, tunnel->dev); |
| skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| } |
| |
| __skb_tunnel_rx(skb, tunnel->dev); |
| |
| skb_reset_network_header(skb); |
| |
| err = IP6_ECN_decapsulate(ipv6h, skb); |
| if (unlikely(err)) { |
| if (log_ecn_error) |
| net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", |
| &ipv6h->saddr, |
| ipv6_get_dsfield(ipv6h)); |
| if (err > 1) { |
| ++tunnel->dev->stats.rx_frame_errors; |
| ++tunnel->dev->stats.rx_errors; |
| goto drop; |
| } |
| } |
| |
| 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; |
| } |
| icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
| |
| drop: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| struct ipv6_tel_txoption { |
| struct ipv6_txoptions ops; |
| __u8 dst_opt[8]; |
| }; |
| |
| static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
| { |
| memset(opt, 0, sizeof(struct ipv6_tel_txoption)); |
| |
| opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
| opt->dst_opt[3] = 1; |
| opt->dst_opt[4] = encap_limit; |
| opt->dst_opt[5] = IPV6_TLV_PADN; |
| opt->dst_opt[6] = 1; |
| |
| opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
| opt->ops.opt_nflen = 8; |
| } |
| |
| static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, |
| struct net_device *dev, |
| __u8 dsfield, |
| struct flowi6 *fl6, |
| int encap_limit, |
| __u32 *pmtu) |
| { |
| struct net *net = dev_net(dev); |
| struct ip6_tnl *tunnel = netdev_priv(dev); |
| struct net_device *tdev; /* Device to other host */ |
| struct ipv6hdr *ipv6h; /* Our new IP header */ |
| unsigned int max_headroom = 0; /* The extra header space needed */ |
| int gre_hlen; |
| struct ipv6_tel_txoption opt; |
| int mtu; |
| struct dst_entry *dst = NULL, *ndst = NULL; |
| struct net_device_stats *stats = &tunnel->dev->stats; |
| int err = -1; |
| u8 proto; |
| struct sk_buff *new_skb; |
| |
| if (dev->type == ARPHRD_ETHER) |
| IPCB(skb)->flags = 0; |
| |
| if (dev->header_ops && dev->type == ARPHRD_IP6GRE) { |
| gre_hlen = 0; |
| ipv6h = (struct ipv6hdr *)skb->data; |
| fl6->daddr = ipv6h->daddr; |
| } else { |
| gre_hlen = tunnel->hlen; |
| fl6->daddr = tunnel->parms.raddr; |
| } |
| |
| if (!fl6->flowi6_mark) |
| dst = ip6_tnl_dst_check(tunnel); |
| |
| if (!dst) { |
| 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; |
| } |
| |
| tdev = dst->dev; |
| |
| if (tdev == dev) { |
| stats->collisions++; |
| net_warn_ratelimited("%s: Local routing loop detected!\n", |
| tunnel->parms.name); |
| goto tx_err_dst_release; |
| } |
| |
| mtu = dst_mtu(dst) - sizeof(*ipv6h); |
| if (encap_limit >= 0) { |
| max_headroom += 8; |
| mtu -= 8; |
| } |
| if (mtu < IPV6_MIN_MTU) |
| mtu = IPV6_MIN_MTU; |
| if (skb_dst(skb)) |
| skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
| if (skb->len > mtu) { |
| *pmtu = mtu; |
| err = -EMSGSIZE; |
| goto tx_err_dst_release; |
| } |
| |
| if (tunnel->err_count > 0) { |
| if (time_before(jiffies, |
| tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) { |
| tunnel->err_count--; |
| |
| dst_link_failure(skb); |
| } else |
| tunnel->err_count = 0; |
| } |
| |
| max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len; |
| |
| if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
| (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { |
| new_skb = skb_realloc_headroom(skb, max_headroom); |
| if (max_headroom > dev->needed_headroom) |
| dev->needed_headroom = max_headroom; |
| if (!new_skb) |
| goto tx_err_dst_release; |
| |
| if (skb->sk) |
| skb_set_owner_w(new_skb, skb->sk); |
| consume_skb(skb); |
| skb = new_skb; |
| } |
| |
| skb_dst_drop(skb); |
| |
| if (fl6->flowi6_mark) { |
| skb_dst_set(skb, dst); |
| ndst = NULL; |
| } else { |
| skb_dst_set_noref(skb, dst); |
| } |
| |
| proto = NEXTHDR_GRE; |
| if (encap_limit >= 0) { |
| init_tel_txopt(&opt, encap_limit); |
| ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); |
| } |
| |
| skb_push(skb, gre_hlen); |
| skb_reset_network_header(skb); |
| skb_set_transport_header(skb, sizeof(*ipv6h)); |
| |
| /* |
| * Push down and install the IP header. |
| */ |
| ipv6h = ipv6_hdr(skb); |
| ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel); |
| ipv6h->hop_limit = tunnel->parms.hop_limit; |
| ipv6h->nexthdr = proto; |
| ipv6h->saddr = fl6->saddr; |
| ipv6h->daddr = fl6->daddr; |
| |
| ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags; |
| ((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ? |
| htons(ETH_P_TEB) : skb->protocol; |
| |
| if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { |
| __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4); |
| |
| if (tunnel->parms.o_flags&GRE_SEQ) { |
| ++tunnel->o_seqno; |
| *ptr = htonl(tunnel->o_seqno); |
| ptr--; |
| } |
| if (tunnel->parms.o_flags&GRE_KEY) { |
| *ptr = tunnel->parms.o_key; |
| ptr--; |
| } |
| if (tunnel->parms.o_flags&GRE_CSUM) { |
| *ptr = 0; |
| *(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1), |
| skb->len - sizeof(struct ipv6hdr)); |
| } |
| } |
| |
| ip6tunnel_xmit(skb, dev); |
| if (ndst) |
| ip6_tnl_dst_store(tunnel, 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 inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| const struct iphdr *iph = ip_hdr(skb); |
| int encap_limit = -1; |
| struct flowi6 fl6; |
| __u8 dsfield; |
| __u32 mtu; |
| int err; |
| |
| if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
| encap_limit = t->parms.encap_limit; |
| |
| memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
| fl6.flowi6_proto = IPPROTO_IPIP; |
| |
| dsfield = ipv4_get_dsfield(iph); |
| |
| if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
| fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) |
| & IPV6_TCLASS_MASK; |
| if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
| fl6.flowi6_mark = skb->mark; |
| |
| err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
| if (err != 0) { |
| /* XXX: send ICMP error even if DF is not set. */ |
| if (err == -EMSGSIZE) |
| icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
| htonl(mtu)); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
| int encap_limit = -1; |
| __u16 offset; |
| struct flowi6 fl6; |
| __u8 dsfield; |
| __u32 mtu; |
| int err; |
| |
| if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) |
| return -1; |
| |
| offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
| if (offset > 0) { |
| struct ipv6_tlv_tnl_enc_lim *tel; |
| tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
| if (tel->encap_limit == 0) { |
| icmpv6_send(skb, ICMPV6_PARAMPROB, |
| ICMPV6_HDR_FIELD, offset + 2); |
| return -1; |
| } |
| encap_limit = tel->encap_limit - 1; |
| } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
| encap_limit = t->parms.encap_limit; |
| |
| memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
| fl6.flowi6_proto = IPPROTO_IPV6; |
| |
| dsfield = ipv6_get_dsfield(ipv6h); |
| if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
| fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
| if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
| fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); |
| if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
| fl6.flowi6_mark = skb->mark; |
| |
| err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); |
| if (err != 0) { |
| if (err == -EMSGSIZE) |
| icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * ip6_tnl_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 ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, |
| const struct ipv6hdr *hdr) |
| { |
| return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); |
| } |
| |
| static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| int encap_limit = -1; |
| struct flowi6 fl6; |
| __u32 mtu; |
| int err; |
| |
| if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
| encap_limit = t->parms.encap_limit; |
| |
| memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
| fl6.flowi6_proto = skb->protocol; |
| |
| err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu); |
| |
| return err; |
| } |
| |
| static netdev_tx_t ip6gre_tunnel_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; |
| |
| if (!ip6_tnl_xmit_ctl(t)) |
| goto tx_err; |
| |
| switch (skb->protocol) { |
| case htons(ETH_P_IP): |
| ret = ip6gre_xmit_ipv4(skb, dev); |
| break; |
| case htons(ETH_P_IPV6): |
| ret = ip6gre_xmit_ipv6(skb, dev); |
| break; |
| default: |
| ret = ip6gre_xmit_other(skb, dev); |
| break; |
| } |
| |
| 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 ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) |
| { |
| struct net_device *dev = t->dev; |
| struct __ip6_tnl_parm *p = &t->parms; |
| struct flowi6 *fl6 = &t->fl.u.ip6; |
| int addend = sizeof(struct ipv6hdr) + 4; |
| |
| if (dev->type != ARPHRD_ETHER) { |
| 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->flowlabel = 0; |
| |
| if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) |
| fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
| if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
| fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
| |
| 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->type != ARPHRD_ETHER) |
| dev->flags |= IFF_POINTOPOINT; |
| else |
| dev->flags &= ~IFF_POINTOPOINT; |
| |
| dev->iflink = p->link; |
| |
| /* Precalculate GRE options length */ |
| if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { |
| if (t->parms.o_flags&GRE_CSUM) |
| addend += 4; |
| if (t->parms.o_flags&GRE_KEY) |
| addend += 4; |
| if (t->parms.o_flags&GRE_SEQ) |
| addend += 4; |
| } |
| |
| 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 + addend; |
| |
| if (set_mtu) { |
| dev->mtu = rt->dst.dev->mtu - addend; |
| if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
| dev->mtu -= 8; |
| |
| if (dev->mtu < IPV6_MIN_MTU) |
| dev->mtu = IPV6_MIN_MTU; |
| } |
| } |
| ip6_rt_put(rt); |
| } |
| |
| t->hlen = addend; |
| } |
| |
| static int ip6gre_tnl_change(struct ip6_tnl *t, |
| const struct __ip6_tnl_parm *p, int set_mtu) |
| { |
| t->parms.laddr = p->laddr; |
| t->parms.raddr = p->raddr; |
| t->parms.flags = p->flags; |
| t->parms.hop_limit = p->hop_limit; |
| t->parms.encap_limit = p->encap_limit; |
| t->parms.flowinfo = p->flowinfo; |
| t->parms.link = p->link; |
| t->parms.proto = p->proto; |
| t->parms.i_key = p->i_key; |
| t->parms.o_key = p->o_key; |
| t->parms.i_flags = p->i_flags; |
| t->parms.o_flags = p->o_flags; |
| ip6_tnl_dst_reset(t); |
| ip6gre_tnl_link_config(t, set_mtu); |
| return 0; |
| } |
| |
| static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, |
| const struct ip6_tnl_parm2 *u) |
| { |
| p->laddr = u->laddr; |
| p->raddr = u->raddr; |
| p->flags = u->flags; |
| p->hop_limit = u->hop_limit; |
| p->encap_limit = u->encap_limit; |
| p->flowinfo = u->flowinfo; |
| p->link = u->link; |
| p->i_key = u->i_key; |
| p->o_key = u->o_key; |
| p->i_flags = u->i_flags; |
| p->o_flags = u->o_flags; |
| memcpy(p->name, u->name, sizeof(u->name)); |
| } |
| |
| static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, |
| const struct __ip6_tnl_parm *p) |
| { |
| u->proto = IPPROTO_GRE; |
| u->laddr = p->laddr; |
| u->raddr = p->raddr; |
| u->flags = p->flags; |
| u->hop_limit = p->hop_limit; |
| u->encap_limit = p->encap_limit; |
| u->flowinfo = p->flowinfo; |
| u->link = p->link; |
| u->i_key = p->i_key; |
| u->o_key = p->o_key; |
| u->i_flags = p->i_flags; |
| u->o_flags = p->o_flags; |
| memcpy(u->name, p->name, sizeof(u->name)); |
| } |
| |
| static int ip6gre_tunnel_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; |
| struct net *net = dev_net(dev); |
| struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
| |
| switch (cmd) { |
| case SIOCGETTUNNEL: |
| t = NULL; |
| if (dev == ign->fb_tunnel_dev) { |
| if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| err = -EFAULT; |
| break; |
| } |
| ip6gre_tnl_parm_from_user(&p1, &p); |
| t = ip6gre_tunnel_locate(net, &p1, 0); |
| } |
| if (t == NULL) |
| t = netdev_priv(dev); |
| memset(&p, 0, sizeof(p)); |
| ip6gre_tnl_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)) |
| goto done; |
| |
| err = -EFAULT; |
| if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| goto done; |
| |
| err = -EINVAL; |
| if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) |
| goto done; |
| |
| if (!(p.i_flags&GRE_KEY)) |
| p.i_key = 0; |
| if (!(p.o_flags&GRE_KEY)) |
| p.o_key = 0; |
| |
| ip6gre_tnl_parm_from_user(&p1, &p); |
| t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); |
| |
| if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
| if (t != NULL) { |
| if (t->dev != dev) { |
| err = -EEXIST; |
| break; |
| } |
| } else { |
| t = netdev_priv(dev); |
| |
| ip6gre_tunnel_unlink(ign, t); |
| synchronize_net(); |
| ip6gre_tnl_change(t, &p1, 1); |
| ip6gre_tunnel_link(ign, t); |
| netdev_state_change(dev); |
| } |
| } |
| |
| if (t) { |
| err = 0; |
| |
| memset(&p, 0, sizeof(p)); |
| ip6gre_tnl_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)) |
| goto done; |
| |
| if (dev == ign->fb_tunnel_dev) { |
| err = -EFAULT; |
| if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| goto done; |
| err = -ENOENT; |
| ip6gre_tnl_parm_from_user(&p1, &p); |
| t = ip6gre_tunnel_locate(net, &p1, 0); |
| if (t == NULL) |
| goto done; |
| err = -EPERM; |
| if (t == netdev_priv(ign->fb_tunnel_dev)) |
| goto done; |
| dev = t->dev; |
| } |
| unregister_netdevice(dev); |
| err = 0; |
| break; |
| |
| default: |
| err = -EINVAL; |
| } |
| |
| done: |
| return err; |
| } |
| |
| static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| struct ip6_tnl *tunnel = netdev_priv(dev); |
| if (new_mtu < 68 || |
| new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) |
| return -EINVAL; |
| dev->mtu = new_mtu; |
| return 0; |
| } |
| |
| static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, |
| unsigned short type, |
| const void *daddr, const void *saddr, unsigned int len) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen); |
| __be16 *p = (__be16 *)(ipv6h+1); |
| |
| ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel); |
| ipv6h->hop_limit = t->parms.hop_limit; |
| ipv6h->nexthdr = NEXTHDR_GRE; |
| ipv6h->saddr = t->parms.laddr; |
| ipv6h->daddr = t->parms.raddr; |
| |
| p[0] = t->parms.o_flags; |
| p[1] = htons(type); |
| |
| /* |
| * Set the source hardware address. |
| */ |
| |
| if (saddr) |
| memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); |
| if (daddr) |
| memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); |
| if (!ipv6_addr_any(&ipv6h->daddr)) |
| return t->hlen; |
| |
| return -t->hlen; |
| } |
| |
| static const struct header_ops ip6gre_header_ops = { |
| .create = ip6gre_header, |
| }; |
| |
| static const struct net_device_ops ip6gre_netdev_ops = { |
| .ndo_init = ip6gre_tunnel_init, |
| .ndo_uninit = ip6gre_tunnel_uninit, |
| .ndo_start_xmit = ip6gre_tunnel_xmit, |
| .ndo_do_ioctl = ip6gre_tunnel_ioctl, |
| .ndo_change_mtu = ip6gre_tunnel_change_mtu, |
| .ndo_get_stats64 = ip_tunnel_get_stats64, |
| }; |
| |
| static void ip6gre_dev_free(struct net_device *dev) |
| { |
| free_percpu(dev->tstats); |
| free_netdev(dev); |
| } |
| |
| static void ip6gre_tunnel_setup(struct net_device *dev) |
| { |
| struct ip6_tnl *t; |
| |
| dev->netdev_ops = &ip6gre_netdev_ops; |
| dev->destructor = ip6gre_dev_free; |
| |
| dev->type = ARPHRD_IP6GRE; |
| dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4; |
| dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4; |
| t = netdev_priv(dev); |
| if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
| dev->mtu -= 8; |
| dev->flags |= IFF_NOARP; |
| dev->iflink = 0; |
| dev->addr_len = sizeof(struct in6_addr); |
| dev->features |= NETIF_F_NETNS_LOCAL; |
| dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
| } |
| |
| static int ip6gre_tunnel_init(struct net_device *dev) |
| { |
| struct ip6_tnl *tunnel; |
| |
| tunnel = netdev_priv(dev); |
| |
| tunnel->dev = dev; |
| strcpy(tunnel->parms.name, dev->name); |
| |
| memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr)); |
| memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); |
| |
| if (ipv6_addr_any(&tunnel->parms.raddr)) |
| dev->header_ops = &ip6gre_header_ops; |
| |
| dev->tstats = alloc_percpu(struct pcpu_tstats); |
| if (!dev->tstats) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void ip6gre_fb_tunnel_init(struct net_device *dev) |
| { |
| struct ip6_tnl *tunnel = netdev_priv(dev); |
| |
| tunnel->dev = dev; |
| strcpy(tunnel->parms.name, dev->name); |
| |
| tunnel->hlen = sizeof(struct ipv6hdr) + 4; |
| |
| dev_hold(dev); |
| } |
| |
| |
| static struct inet6_protocol ip6gre_protocol __read_mostly = { |
| .handler = ip6gre_rcv, |
| .err_handler = ip6gre_err, |
| .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| }; |
| |
| static void ip6gre_destroy_tunnels(struct ip6gre_net *ign, |
| struct list_head *head) |
| { |
| int prio; |
| |
| for (prio = 0; prio < 4; prio++) { |
| int h; |
| for (h = 0; h < HASH_SIZE; h++) { |
| struct ip6_tnl *t; |
| |
| t = rtnl_dereference(ign->tunnels[prio][h]); |
| |
| while (t != NULL) { |
| unregister_netdevice_queue(t->dev, head); |
| t = rtnl_dereference(t->next); |
| } |
| } |
| } |
| } |
| |
| static int __net_init ip6gre_init_net(struct net *net) |
| { |
| struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
| int err; |
| |
| ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", |
| ip6gre_tunnel_setup); |
| if (!ign->fb_tunnel_dev) { |
| err = -ENOMEM; |
| goto err_alloc_dev; |
| } |
| dev_net_set(ign->fb_tunnel_dev, net); |
| |
| ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); |
| ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; |
| |
| err = register_netdev(ign->fb_tunnel_dev); |
| if (err) |
| goto err_reg_dev; |
| |
| rcu_assign_pointer(ign->tunnels_wc[0], |
| netdev_priv(ign->fb_tunnel_dev)); |
| return 0; |
| |
| err_reg_dev: |
| ip6gre_dev_free(ign->fb_tunnel_dev); |
| err_alloc_dev: |
| return err; |
| } |
| |
| static void __net_exit ip6gre_exit_net(struct net *net) |
| { |
| struct ip6gre_net *ign; |
| LIST_HEAD(list); |
| |
| ign = net_generic(net, ip6gre_net_id); |
| rtnl_lock(); |
| ip6gre_destroy_tunnels(ign, &list); |
| unregister_netdevice_many(&list); |
| rtnl_unlock(); |
| } |
| |
| static struct pernet_operations ip6gre_net_ops = { |
| .init = ip6gre_init_net, |
| .exit = ip6gre_exit_net, |
| .id = &ip6gre_net_id, |
| .size = sizeof(struct ip6gre_net), |
| }; |
| |
| static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
| { |
| __be16 flags; |
| |
| if (!data) |
| return 0; |
| |
| flags = 0; |
| if (data[IFLA_GRE_IFLAGS]) |
| flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| if (data[IFLA_GRE_OFLAGS]) |
| flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| if (flags & (GRE_VERSION|GRE_ROUTING)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
| { |
| struct in6_addr daddr; |
| |
| if (tb[IFLA_ADDRESS]) { |
| if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| return -EINVAL; |
| if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| return -EADDRNOTAVAIL; |
| } |
| |
| if (!data) |
| goto out; |
| |
| if (data[IFLA_GRE_REMOTE]) { |
| nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); |
| if (ipv6_addr_any(&daddr)) |
| return -EINVAL; |
| } |
| |
| out: |
| return ip6gre_tunnel_validate(tb, data); |
| } |
| |
| |
| static void ip6gre_netlink_parms(struct nlattr *data[], |
| struct __ip6_tnl_parm *parms) |
| { |
| memset(parms, 0, sizeof(*parms)); |
| |
| if (!data) |
| return; |
| |
| if (data[IFLA_GRE_LINK]) |
| parms->link = nla_get_u32(data[IFLA_GRE_LINK]); |
| |
| if (data[IFLA_GRE_IFLAGS]) |
| parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| |
| if (data[IFLA_GRE_OFLAGS]) |
| parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| |
| if (data[IFLA_GRE_IKEY]) |
| parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); |
| |
| if (data[IFLA_GRE_OKEY]) |
| parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); |
| |
| if (data[IFLA_GRE_LOCAL]) |
| nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr)); |
| |
| if (data[IFLA_GRE_REMOTE]) |
| nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr)); |
| |
| if (data[IFLA_GRE_TTL]) |
| parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); |
| |
| if (data[IFLA_GRE_ENCAP_LIMIT]) |
| parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); |
| |
| if (data[IFLA_GRE_FLOWINFO]) |
| parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]); |
| |
| if (data[IFLA_GRE_FLAGS]) |
| parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); |
| } |
| |
| static int ip6gre_tap_init(struct net_device *dev) |
| { |
| struct ip6_tnl *tunnel; |
| |
| tunnel = netdev_priv(dev); |
| |
| tunnel->dev = dev; |
| strcpy(tunnel->parms.name, dev->name); |
| |
| ip6gre_tnl_link_config(tunnel, 1); |
| |
| dev->tstats = alloc_percpu(struct pcpu_tstats); |
| if (!dev->tstats) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static const struct net_device_ops ip6gre_tap_netdev_ops = { |
| .ndo_init = ip6gre_tap_init, |
| .ndo_uninit = ip6gre_tunnel_uninit, |
| .ndo_start_xmit = ip6gre_tunnel_xmit, |
| .ndo_set_mac_address = eth_mac_addr, |
| .ndo_validate_addr = eth_validate_addr, |
| .ndo_change_mtu = ip6gre_tunnel_change_mtu, |
| .ndo_get_stats64 = ip_tunnel_get_stats64, |
| }; |
| |
| static void ip6gre_tap_setup(struct net_device *dev) |
| { |
| |
| ether_setup(dev); |
| |
| dev->netdev_ops = &ip6gre_tap_netdev_ops; |
| dev->destructor = ip6gre_dev_free; |
| |
| dev->iflink = 0; |
| dev->features |= NETIF_F_NETNS_LOCAL; |
| } |
| |
| static int ip6gre_newlink(struct net *src_net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[]) |
| { |
| struct ip6_tnl *nt; |
| struct net *net = dev_net(dev); |
| struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
| int err; |
| |
| nt = netdev_priv(dev); |
| ip6gre_netlink_parms(data, &nt->parms); |
| |
| if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) |
| return -EEXIST; |
| |
| if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
| eth_hw_addr_random(dev); |
| |
| nt->dev = dev; |
| ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); |
| |
| /* Can use a lockless transmit, unless we generate output sequences */ |
| if (!(nt->parms.o_flags & GRE_SEQ)) |
| dev->features |= NETIF_F_LLTX; |
| |
| err = register_netdevice(dev); |
| if (err) |
| goto out; |
| |
| dev_hold(dev); |
| ip6gre_tunnel_link(ign, nt); |
| |
| out: |
| return err; |
| } |
| |
| static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], |
| struct nlattr *data[]) |
| { |
| struct ip6_tnl *t, *nt; |
| struct net *net = dev_net(dev); |
| struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
| struct __ip6_tnl_parm p; |
| |
| if (dev == ign->fb_tunnel_dev) |
| return -EINVAL; |
| |
| nt = netdev_priv(dev); |
| ip6gre_netlink_parms(data, &p); |
| |
| t = ip6gre_tunnel_locate(net, &p, 0); |
| |
| if (t) { |
| if (t->dev != dev) |
| return -EEXIST; |
| } else { |
| t = nt; |
| |
| ip6gre_tunnel_unlink(ign, t); |
| ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); |
| ip6gre_tunnel_link(ign, t); |
| netdev_state_change(dev); |
| } |
| |
| return 0; |
| } |
| |
| static void ip6gre_dellink(struct net_device *dev, struct list_head *head) |
| { |
| struct net *net = dev_net(dev); |
| struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
| |
| if (dev != ign->fb_tunnel_dev) |
| unregister_netdevice_queue(dev, head); |
| } |
| |
| static size_t ip6gre_get_size(const struct net_device *dev) |
| { |
| return |
| /* IFLA_GRE_LINK */ |
| nla_total_size(4) + |
| /* IFLA_GRE_IFLAGS */ |
| nla_total_size(2) + |
| /* IFLA_GRE_OFLAGS */ |
| nla_total_size(2) + |
| /* IFLA_GRE_IKEY */ |
| nla_total_size(4) + |
| /* IFLA_GRE_OKEY */ |
| nla_total_size(4) + |
| /* IFLA_GRE_LOCAL */ |
| nla_total_size(sizeof(struct in6_addr)) + |
| /* IFLA_GRE_REMOTE */ |
| nla_total_size(sizeof(struct in6_addr)) + |
| /* IFLA_GRE_TTL */ |
| nla_total_size(1) + |
| /* IFLA_GRE_TOS */ |
| nla_total_size(1) + |
| /* IFLA_GRE_ENCAP_LIMIT */ |
| nla_total_size(1) + |
| /* IFLA_GRE_FLOWINFO */ |
| nla_total_size(4) + |
| /* IFLA_GRE_FLAGS */ |
| nla_total_size(4) + |
| 0; |
| } |
| |
| static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct __ip6_tnl_parm *p = &t->parms; |
| |
| if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
| nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) || |
| nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) || |
| nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
| nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || |
| nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) || |
| nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) || |
| nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || |
| /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/ |
| nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || |
| nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || |
| nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags)) |
| goto nla_put_failure; |
| return 0; |
| |
| nla_put_failure: |
| return -EMSGSIZE; |
| } |
| |
| static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { |
| [IFLA_GRE_LINK] = { .type = NLA_U32 }, |
| [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
| [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
| [IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
| [IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
| [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) }, |
| [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) }, |
| [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
| [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, |
| [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, |
| [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, |
| }; |
| |
| static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { |
| .kind = "ip6gre", |
| .maxtype = IFLA_GRE_MAX, |
| .policy = ip6gre_policy, |
| .priv_size = sizeof(struct ip6_tnl), |
| .setup = ip6gre_tunnel_setup, |
| .validate = ip6gre_tunnel_validate, |
| .newlink = ip6gre_newlink, |
| .changelink = ip6gre_changelink, |
| .dellink = ip6gre_dellink, |
| .get_size = ip6gre_get_size, |
| .fill_info = ip6gre_fill_info, |
| }; |
| |
| static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { |
| .kind = "ip6gretap", |
| .maxtype = IFLA_GRE_MAX, |
| .policy = ip6gre_policy, |
| .priv_size = sizeof(struct ip6_tnl), |
| .setup = ip6gre_tap_setup, |
| .validate = ip6gre_tap_validate, |
| .newlink = ip6gre_newlink, |
| .changelink = ip6gre_changelink, |
| .get_size = ip6gre_get_size, |
| .fill_info = ip6gre_fill_info, |
| }; |
| |
| /* |
| * And now the modules code and kernel interface. |
| */ |
| |
| static int __init ip6gre_init(void) |
| { |
| int err; |
| |
| pr_info("GRE over IPv6 tunneling driver\n"); |
| |
| err = register_pernet_device(&ip6gre_net_ops); |
| if (err < 0) |
| return err; |
| |
| err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); |
| if (err < 0) { |
| pr_info("%s: can't add protocol\n", __func__); |
| goto add_proto_failed; |
| } |
| |
| err = rtnl_link_register(&ip6gre_link_ops); |
| if (err < 0) |
| goto rtnl_link_failed; |
| |
| err = rtnl_link_register(&ip6gre_tap_ops); |
| if (err < 0) |
| goto tap_ops_failed; |
| |
| out: |
| return err; |
| |
| tap_ops_failed: |
| rtnl_link_unregister(&ip6gre_link_ops); |
| rtnl_link_failed: |
| inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); |
| add_proto_failed: |
| unregister_pernet_device(&ip6gre_net_ops); |
| goto out; |
| } |
| |
| static void __exit ip6gre_fini(void) |
| { |
| rtnl_link_unregister(&ip6gre_tap_ops); |
| rtnl_link_unregister(&ip6gre_link_ops); |
| inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); |
| unregister_pernet_device(&ip6gre_net_ops); |
| } |
| |
| module_init(ip6gre_init); |
| module_exit(ip6gre_fini); |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); |
| MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); |
| MODULE_ALIAS_RTNL_LINK("ip6gre"); |
| MODULE_ALIAS_NETDEV("ip6gre0"); |