Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2013 Nicira, Inc. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of version 2 of the GNU General Public |
| 6 | * License as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 16 | * 02110-1301, USA |
| 17 | */ |
| 18 | |
| 19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 20 | |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/skbuff.h> |
| 24 | #include <linux/netdevice.h> |
| 25 | #include <linux/in.h> |
| 26 | #include <linux/if_arp.h> |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 27 | #include <linux/init.h> |
| 28 | #include <linux/in6.h> |
| 29 | #include <linux/inetdevice.h> |
| 30 | #include <linux/netfilter_ipv4.h> |
| 31 | #include <linux/etherdevice.h> |
| 32 | #include <linux/if_ether.h> |
| 33 | #include <linux/if_vlan.h> |
Thomas Graf | e703087 | 2015-07-21 10:44:01 +0200 | [diff] [blame] | 34 | #include <linux/static_key.h> |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 35 | |
| 36 | #include <net/ip.h> |
| 37 | #include <net/icmp.h> |
| 38 | #include <net/protocol.h> |
| 39 | #include <net/ip_tunnels.h> |
| 40 | #include <net/arp.h> |
| 41 | #include <net/checksum.h> |
| 42 | #include <net/dsfield.h> |
| 43 | #include <net/inet_ecn.h> |
| 44 | #include <net/xfrm.h> |
| 45 | #include <net/net_namespace.h> |
| 46 | #include <net/netns/generic.h> |
| 47 | #include <net/rtnetlink.h> |
Jiri Benc | 63d008a | 2015-09-22 18:12:11 +0200 | [diff] [blame] | 48 | #include <net/dst_metadata.h> |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 49 | |
Pravin B Shelar | 039f506 | 2015-12-24 14:34:54 -0800 | [diff] [blame] | 50 | void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
| 51 | __be32 src, __be32 dst, __u8 proto, |
| 52 | __u8 tos, __u8 ttl, __be16 df, bool xnet) |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 53 | { |
Nicolas Dichtel | bc22a0e | 2015-09-18 11:47:40 +0200 | [diff] [blame] | 54 | int pkt_len = skb->len - skb_inner_network_offset(skb); |
Eric W. Biederman | f859b0f | 2015-10-07 16:48:41 -0500 | [diff] [blame] | 55 | struct net *net = dev_net(rt->dst.dev); |
Pravin B Shelar | 039f506 | 2015-12-24 14:34:54 -0800 | [diff] [blame] | 56 | struct net_device *dev = skb->dev; |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 57 | struct iphdr *iph; |
| 58 | int err; |
| 59 | |
Nicolas Dichtel | 963a88b | 2013-09-02 15:34:57 +0200 | [diff] [blame] | 60 | skb_scrub_packet(skb, xnet); |
| 61 | |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 62 | skb_clear_hash(skb); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 63 | skb_dst_set(skb, &rt->dst); |
| 64 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
| 65 | |
| 66 | /* Push down and install the IP header. */ |
Steffen Klassert | 78a3694 | 2013-10-01 11:35:51 +0200 | [diff] [blame] | 67 | skb_push(skb, sizeof(struct iphdr)); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 68 | skb_reset_network_header(skb); |
| 69 | |
| 70 | iph = ip_hdr(skb); |
| 71 | |
| 72 | iph->version = 4; |
| 73 | iph->ihl = sizeof(struct iphdr) >> 2; |
| 74 | iph->frag_off = df; |
| 75 | iph->protocol = proto; |
| 76 | iph->tos = tos; |
| 77 | iph->daddr = dst; |
| 78 | iph->saddr = src; |
| 79 | iph->ttl = ttl; |
Eric W. Biederman | f859b0f | 2015-10-07 16:48:41 -0500 | [diff] [blame] | 80 | __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 81 | |
Eric W. Biederman | 33224b1 | 2015-10-07 16:48:46 -0500 | [diff] [blame] | 82 | err = ip_local_out(net, sk, skb); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 83 | if (unlikely(net_xmit_eval(err))) |
| 84 | pkt_len = 0; |
Pravin B Shelar | 039f506 | 2015-12-24 14:34:54 -0800 | [diff] [blame] | 85 | iptunnel_xmit_stats(dev, pkt_len); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 86 | } |
| 87 | EXPORT_SYMBOL_GPL(iptunnel_xmit); |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 88 | |
Jiri Benc | 7f290c9 | 2016-02-18 11:22:52 +0100 | [diff] [blame] | 89 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto, |
| 90 | bool xnet) |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 91 | { |
| 92 | if (unlikely(!pskb_may_pull(skb, hdr_len))) |
| 93 | return -ENOMEM; |
| 94 | |
| 95 | skb_pull_rcsum(skb, hdr_len); |
| 96 | |
| 97 | if (inner_proto == htons(ETH_P_TEB)) { |
Li RongQing | 1245dfc | 2014-10-17 16:53:23 +0800 | [diff] [blame] | 98 | struct ethhdr *eh; |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 99 | |
| 100 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) |
| 101 | return -ENOMEM; |
| 102 | |
Li RongQing | 1245dfc | 2014-10-17 16:53:23 +0800 | [diff] [blame] | 103 | eh = (struct ethhdr *)skb->data; |
Alexander Duyck | d181ddc | 2015-05-04 14:33:59 -0700 | [diff] [blame] | 104 | if (likely(eth_proto_is_802_3(eh->h_proto))) |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 105 | skb->protocol = eh->h_proto; |
| 106 | else |
| 107 | skb->protocol = htons(ETH_P_802_2); |
| 108 | |
| 109 | } else { |
| 110 | skb->protocol = inner_proto; |
| 111 | } |
| 112 | |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 113 | skb_clear_hash_if_not_l4(skb); |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 114 | skb->vlan_tci = 0; |
| 115 | skb_set_queue_mapping(skb, 0); |
Jiri Benc | 7f290c9 | 2016-02-18 11:22:52 +0100 | [diff] [blame] | 116 | skb_scrub_packet(skb, xnet); |
Jesse Gross | a09a4c8 | 2016-03-19 09:32:02 -0700 | [diff] [blame] | 117 | |
| 118 | return iptunnel_pull_offloads(skb); |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 119 | } |
| 120 | EXPORT_SYMBOL_GPL(iptunnel_pull_header); |
Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 121 | |
Jiri Benc | 63d008a | 2015-09-22 18:12:11 +0200 | [diff] [blame] | 122 | struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, |
| 123 | gfp_t flags) |
| 124 | { |
| 125 | struct metadata_dst *res; |
| 126 | struct ip_tunnel_info *dst, *src; |
| 127 | |
| 128 | if (!md || md->u.tun_info.mode & IP_TUNNEL_INFO_TX) |
| 129 | return NULL; |
| 130 | |
| 131 | res = metadata_dst_alloc(0, flags); |
| 132 | if (!res) |
| 133 | return NULL; |
| 134 | |
| 135 | dst = &res->u.tun_info; |
| 136 | src = &md->u.tun_info; |
| 137 | dst->key.tun_id = src->key.tun_id; |
| 138 | if (src->mode & IP_TUNNEL_INFO_IPV6) |
| 139 | memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src, |
| 140 | sizeof(struct in6_addr)); |
| 141 | else |
| 142 | dst->key.u.ipv4.dst = src->key.u.ipv4.src; |
| 143 | dst->mode = src->mode | IP_TUNNEL_INFO_TX; |
| 144 | |
| 145 | return res; |
| 146 | } |
| 147 | EXPORT_SYMBOL_GPL(iptunnel_metadata_reply); |
| 148 | |
Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 149 | struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, |
Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 150 | int gso_type_mask) |
| 151 | { |
| 152 | int err; |
| 153 | |
| 154 | if (likely(!skb->encapsulation)) { |
| 155 | skb_reset_inner_headers(skb); |
| 156 | skb->encapsulation = 1; |
| 157 | } |
| 158 | |
| 159 | if (skb_is_gso(skb)) { |
| 160 | err = skb_unclone(skb, GFP_ATOMIC); |
| 161 | if (unlikely(err)) |
| 162 | goto error; |
| 163 | skb_shinfo(skb)->gso_type |= gso_type_mask; |
| 164 | return skb; |
| 165 | } |
| 166 | |
Edward Cree | 6fa7966 | 2016-02-11 21:02:31 +0000 | [diff] [blame] | 167 | if (skb->ip_summed != CHECKSUM_PARTIAL) { |
Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 168 | skb->ip_summed = CHECKSUM_NONE; |
Edward Cree | 6fa7966 | 2016-02-11 21:02:31 +0000 | [diff] [blame] | 169 | /* We clear encapsulation here to prevent badly-written |
| 170 | * drivers potentially deciding to offload an inner checksum |
| 171 | * if we set CHECKSUM_PARTIAL on the outer header. |
| 172 | * This should go away when the drivers are all fixed. |
| 173 | */ |
Edward Cree | 179bc67 | 2016-02-11 20:48:04 +0000 | [diff] [blame] | 174 | skb->encapsulation = 0; |
| 175 | } |
Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 176 | |
| 177 | return skb; |
| 178 | error: |
| 179 | kfree_skb(skb); |
| 180 | return ERR_PTR(err); |
| 181 | } |
| 182 | EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 183 | |
| 184 | /* Often modified stats are per cpu, other are shared (netdev->stats) */ |
| 185 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, |
| 186 | struct rtnl_link_stats64 *tot) |
| 187 | { |
| 188 | int i; |
| 189 | |
Alexander Duyck | c24a596 | 2015-05-14 14:31:28 -0700 | [diff] [blame] | 190 | netdev_stats_to_stats64(tot, &dev->stats); |
| 191 | |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 192 | for_each_possible_cpu(i) { |
| 193 | const struct pcpu_sw_netstats *tstats = |
| 194 | per_cpu_ptr(dev->tstats, i); |
| 195 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
| 196 | unsigned int start; |
| 197 | |
| 198 | do { |
Eric W. Biederman | 57a7744 | 2014-03-13 21:26:42 -0700 | [diff] [blame] | 199 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 200 | rx_packets = tstats->rx_packets; |
| 201 | tx_packets = tstats->tx_packets; |
| 202 | rx_bytes = tstats->rx_bytes; |
| 203 | tx_bytes = tstats->tx_bytes; |
Eric W. Biederman | 57a7744 | 2014-03-13 21:26:42 -0700 | [diff] [blame] | 204 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 205 | |
| 206 | tot->rx_packets += rx_packets; |
| 207 | tot->tx_packets += tx_packets; |
| 208 | tot->rx_bytes += rx_bytes; |
| 209 | tot->tx_bytes += tx_bytes; |
| 210 | } |
| 211 | |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 212 | return tot; |
| 213 | } |
| 214 | EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 215 | |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 216 | static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = { |
| 217 | [LWTUNNEL_IP_ID] = { .type = NLA_U64 }, |
| 218 | [LWTUNNEL_IP_DST] = { .type = NLA_U32 }, |
| 219 | [LWTUNNEL_IP_SRC] = { .type = NLA_U32 }, |
| 220 | [LWTUNNEL_IP_TTL] = { .type = NLA_U8 }, |
| 221 | [LWTUNNEL_IP_TOS] = { .type = NLA_U8 }, |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 222 | [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 }, |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 223 | }; |
| 224 | |
| 225 | static int ip_tun_build_state(struct net_device *dev, struct nlattr *attr, |
Tom Herbert | 127eb7c | 2015-08-24 09:45:41 -0700 | [diff] [blame] | 226 | unsigned int family, const void *cfg, |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 227 | struct lwtunnel_state **ts) |
| 228 | { |
| 229 | struct ip_tunnel_info *tun_info; |
| 230 | struct lwtunnel_state *new_state; |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 231 | struct nlattr *tb[LWTUNNEL_IP_MAX + 1]; |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 232 | int err; |
| 233 | |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 234 | err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy); |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 235 | if (err < 0) |
| 236 | return err; |
| 237 | |
| 238 | new_state = lwtunnel_state_alloc(sizeof(*tun_info)); |
| 239 | if (!new_state) |
| 240 | return -ENOMEM; |
| 241 | |
| 242 | new_state->type = LWTUNNEL_ENCAP_IP; |
| 243 | |
| 244 | tun_info = lwt_tun_info(new_state); |
| 245 | |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 246 | if (tb[LWTUNNEL_IP_ID]) |
Lance Richardson | 30d3d83 | 2016-01-06 17:22:45 -0500 | [diff] [blame] | 247 | tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]); |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 248 | |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 249 | if (tb[LWTUNNEL_IP_DST]) |
Jiri Benc | c1ea5d6 | 2015-08-20 13:56:23 +0200 | [diff] [blame] | 250 | tun_info->key.u.ipv4.dst = nla_get_be32(tb[LWTUNNEL_IP_DST]); |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 251 | |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 252 | if (tb[LWTUNNEL_IP_SRC]) |
Jiri Benc | c1ea5d6 | 2015-08-20 13:56:23 +0200 | [diff] [blame] | 253 | tun_info->key.u.ipv4.src = nla_get_be32(tb[LWTUNNEL_IP_SRC]); |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 254 | |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 255 | if (tb[LWTUNNEL_IP_TTL]) |
Jiri Benc | 7c383fb | 2015-08-20 13:56:24 +0200 | [diff] [blame] | 256 | tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]); |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 257 | |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 258 | if (tb[LWTUNNEL_IP_TOS]) |
Jiri Benc | 7c383fb | 2015-08-20 13:56:24 +0200 | [diff] [blame] | 259 | tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]); |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 260 | |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 261 | if (tb[LWTUNNEL_IP_FLAGS]) |
Lance Richardson | 30d3d83 | 2016-01-06 17:22:45 -0500 | [diff] [blame] | 262 | tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]); |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 263 | |
| 264 | tun_info->mode = IP_TUNNEL_INFO_TX; |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 265 | tun_info->options_len = 0; |
| 266 | |
| 267 | *ts = new_state; |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | static int ip_tun_fill_encap_info(struct sk_buff *skb, |
| 273 | struct lwtunnel_state *lwtstate) |
| 274 | { |
| 275 | struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); |
| 276 | |
Lance Richardson | 30d3d83 | 2016-01-06 17:22:45 -0500 | [diff] [blame] | 277 | if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id) || |
Jiri Benc | c1ea5d6 | 2015-08-20 13:56:23 +0200 | [diff] [blame] | 278 | nla_put_be32(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) || |
| 279 | nla_put_be32(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) || |
Jiri Benc | 7c383fb | 2015-08-20 13:56:24 +0200 | [diff] [blame] | 280 | nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) || |
| 281 | nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) || |
Lance Richardson | 30d3d83 | 2016-01-06 17:22:45 -0500 | [diff] [blame] | 282 | nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags)) |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 283 | return -ENOMEM; |
| 284 | |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate) |
| 289 | { |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 290 | return nla_total_size(8) /* LWTUNNEL_IP_ID */ |
| 291 | + nla_total_size(4) /* LWTUNNEL_IP_DST */ |
| 292 | + nla_total_size(4) /* LWTUNNEL_IP_SRC */ |
| 293 | + nla_total_size(1) /* LWTUNNEL_IP_TOS */ |
| 294 | + nla_total_size(1) /* LWTUNNEL_IP_TTL */ |
Jiri Benc | a1c234f | 2015-08-14 16:40:40 +0200 | [diff] [blame] | 295 | + nla_total_size(2); /* LWTUNNEL_IP_FLAGS */ |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 296 | } |
| 297 | |
Jiri Benc | 2d79849 | 2015-08-18 18:42:09 +0200 | [diff] [blame] | 298 | static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) |
| 299 | { |
| 300 | return memcmp(lwt_tun_info(a), lwt_tun_info(b), |
| 301 | sizeof(struct ip_tunnel_info)); |
| 302 | } |
| 303 | |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 304 | static const struct lwtunnel_encap_ops ip_tun_lwt_ops = { |
| 305 | .build_state = ip_tun_build_state, |
| 306 | .fill_encap = ip_tun_fill_encap_info, |
| 307 | .get_encap_size = ip_tun_encap_nlsize, |
Jiri Benc | 2d79849 | 2015-08-18 18:42:09 +0200 | [diff] [blame] | 308 | .cmp_encap = ip_tun_cmp_encap, |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 309 | }; |
| 310 | |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 311 | static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = { |
| 312 | [LWTUNNEL_IP6_ID] = { .type = NLA_U64 }, |
| 313 | [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) }, |
| 314 | [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) }, |
| 315 | [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 }, |
| 316 | [LWTUNNEL_IP6_TC] = { .type = NLA_U8 }, |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 317 | [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 }, |
| 318 | }; |
| 319 | |
| 320 | static int ip6_tun_build_state(struct net_device *dev, struct nlattr *attr, |
Tom Herbert | 127eb7c | 2015-08-24 09:45:41 -0700 | [diff] [blame] | 321 | unsigned int family, const void *cfg, |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 322 | struct lwtunnel_state **ts) |
| 323 | { |
| 324 | struct ip_tunnel_info *tun_info; |
| 325 | struct lwtunnel_state *new_state; |
| 326 | struct nlattr *tb[LWTUNNEL_IP6_MAX + 1]; |
| 327 | int err; |
| 328 | |
| 329 | err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy); |
| 330 | if (err < 0) |
| 331 | return err; |
| 332 | |
| 333 | new_state = lwtunnel_state_alloc(sizeof(*tun_info)); |
| 334 | if (!new_state) |
| 335 | return -ENOMEM; |
| 336 | |
| 337 | new_state->type = LWTUNNEL_ENCAP_IP6; |
| 338 | |
| 339 | tun_info = lwt_tun_info(new_state); |
| 340 | |
| 341 | if (tb[LWTUNNEL_IP6_ID]) |
Lance Richardson | 30d3d83 | 2016-01-06 17:22:45 -0500 | [diff] [blame] | 342 | tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]); |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 343 | |
| 344 | if (tb[LWTUNNEL_IP6_DST]) |
| 345 | tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]); |
| 346 | |
| 347 | if (tb[LWTUNNEL_IP6_SRC]) |
| 348 | tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]); |
| 349 | |
| 350 | if (tb[LWTUNNEL_IP6_HOPLIMIT]) |
| 351 | tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]); |
| 352 | |
| 353 | if (tb[LWTUNNEL_IP6_TC]) |
| 354 | tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]); |
| 355 | |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 356 | if (tb[LWTUNNEL_IP6_FLAGS]) |
Lance Richardson | 30d3d83 | 2016-01-06 17:22:45 -0500 | [diff] [blame] | 357 | tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]); |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 358 | |
Jiri Benc | 7f9562a | 2015-08-28 20:48:20 +0200 | [diff] [blame] | 359 | tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6; |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 360 | tun_info->options_len = 0; |
| 361 | |
| 362 | *ts = new_state; |
| 363 | |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | static int ip6_tun_fill_encap_info(struct sk_buff *skb, |
| 368 | struct lwtunnel_state *lwtstate) |
| 369 | { |
| 370 | struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); |
| 371 | |
Lance Richardson | 30d3d83 | 2016-01-06 17:22:45 -0500 | [diff] [blame] | 372 | if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id) || |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 373 | nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) || |
| 374 | nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) || |
Quentin Armitage | 995096a | 2016-03-27 17:06:11 +0100 | [diff] [blame] | 375 | nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) || |
| 376 | nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) || |
Lance Richardson | 30d3d83 | 2016-01-06 17:22:45 -0500 | [diff] [blame] | 377 | nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags)) |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 378 | return -ENOMEM; |
| 379 | |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate) |
| 384 | { |
| 385 | return nla_total_size(8) /* LWTUNNEL_IP6_ID */ |
| 386 | + nla_total_size(16) /* LWTUNNEL_IP6_DST */ |
| 387 | + nla_total_size(16) /* LWTUNNEL_IP6_SRC */ |
| 388 | + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */ |
| 389 | + nla_total_size(1) /* LWTUNNEL_IP6_TC */ |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 390 | + nla_total_size(2); /* LWTUNNEL_IP6_FLAGS */ |
| 391 | } |
| 392 | |
| 393 | static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = { |
| 394 | .build_state = ip6_tun_build_state, |
| 395 | .fill_encap = ip6_tun_fill_encap_info, |
| 396 | .get_encap_size = ip6_tun_encap_nlsize, |
| 397 | .cmp_encap = ip_tun_cmp_encap, |
| 398 | }; |
| 399 | |
Thomas Graf | 045a0fa | 2015-07-23 10:08:44 +0200 | [diff] [blame] | 400 | void __init ip_tunnel_core_init(void) |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 401 | { |
Daniel Borkmann | fca5fdf | 2016-03-16 01:42:51 +0100 | [diff] [blame] | 402 | /* If you land here, make sure whether increasing ip_tunnel_info's |
| 403 | * options_len is a reasonable choice with its usage in front ends |
| 404 | * (f.e., it's part of flow keys, etc). |
| 405 | */ |
| 406 | BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255); |
| 407 | |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 408 | lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP); |
Jiri Benc | 32a2b00 | 2015-08-20 13:56:32 +0200 | [diff] [blame] | 409 | lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6); |
Thomas Graf | 3093fbe | 2015-07-21 10:44:00 +0200 | [diff] [blame] | 410 | } |
Thomas Graf | e703087 | 2015-07-21 10:44:01 +0200 | [diff] [blame] | 411 | |
| 412 | struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE; |
| 413 | EXPORT_SYMBOL(ip_tunnel_metadata_cnt); |
| 414 | |
| 415 | void ip_tunnel_need_metadata(void) |
| 416 | { |
| 417 | static_key_slow_inc(&ip_tunnel_metadata_cnt); |
| 418 | } |
| 419 | EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata); |
| 420 | |
| 421 | void ip_tunnel_unneed_metadata(void) |
| 422 | { |
| 423 | static_key_slow_dec(&ip_tunnel_metadata_cnt); |
| 424 | } |
| 425 | EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata); |