Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 1 | /* |
Pravin B Shelar | 8c8b1b8 | 2014-09-15 19:28:44 -0700 | [diff] [blame] | 2 | * Copyright (c) 2014 Nicira, Inc. |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 3 | * Copyright (c) 2013 Cisco Systems, Inc. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of version 2 of the GNU General Public |
| 7 | * License as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 17 | * 02110-1301, USA |
| 18 | */ |
| 19 | |
| 20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 21 | |
| 22 | #include <linux/in.h> |
| 23 | #include <linux/ip.h> |
| 24 | #include <linux/net.h> |
| 25 | #include <linux/rculist.h> |
| 26 | #include <linux/udp.h> |
Thomas Graf | 62b9c8d | 2014-10-22 17:29:06 +0200 | [diff] [blame] | 27 | #include <linux/module.h> |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 28 | |
| 29 | #include <net/icmp.h> |
| 30 | #include <net/ip.h> |
| 31 | #include <net/udp.h> |
| 32 | #include <net/ip_tunnels.h> |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 33 | #include <net/rtnetlink.h> |
| 34 | #include <net/route.h> |
| 35 | #include <net/dsfield.h> |
| 36 | #include <net/inet_ecn.h> |
| 37 | #include <net/net_namespace.h> |
| 38 | #include <net/netns/generic.h> |
| 39 | #include <net/vxlan.h> |
| 40 | |
| 41 | #include "datapath.h" |
| 42 | #include "vport.h" |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 43 | #include "vport-vxlan.h" |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 44 | |
| 45 | /** |
| 46 | * struct vxlan_port - Keeps track of open UDP ports |
| 47 | * @vs: vxlan_sock created for the port. |
| 48 | * @name: vport name. |
| 49 | */ |
| 50 | struct vxlan_port { |
| 51 | struct vxlan_sock *vs; |
| 52 | char name[IFNAMSIZ]; |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 53 | u32 exts; /* VXLAN_F_* in <net/vxlan.h> */ |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 54 | }; |
| 55 | |
Thomas Graf | 62b9c8d | 2014-10-22 17:29:06 +0200 | [diff] [blame] | 56 | static struct vport_ops ovs_vxlan_vport_ops; |
| 57 | |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 58 | static inline struct vxlan_port *vxlan_vport(const struct vport *vport) |
| 59 | { |
| 60 | return vport_priv(vport); |
| 61 | } |
| 62 | |
| 63 | /* Called with rcu_read_lock and BH disabled. */ |
Thomas Graf | 3511494 | 2015-01-15 03:53:55 +0100 | [diff] [blame] | 64 | static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, |
| 65 | struct vxlan_metadata *md) |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 66 | { |
Jesse Gross | f0b128c | 2014-10-03 15:35:31 -0700 | [diff] [blame] | 67 | struct ovs_tunnel_info tun_info; |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 68 | struct vxlan_port *vxlan_port; |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 69 | struct vport *vport = vs->data; |
| 70 | struct iphdr *iph; |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 71 | struct ovs_vxlan_opts opts = { |
| 72 | .gbp = md->gbp, |
| 73 | }; |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 74 | __be64 key; |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 75 | __be16 flags; |
| 76 | |
Jesse Gross | b869387 | 2015-01-28 16:32:46 -0800 | [diff] [blame] | 77 | flags = TUNNEL_KEY | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0); |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 78 | vxlan_port = vxlan_vport(vport); |
Thomas Graf | fd3137c | 2015-02-09 16:56:37 +0100 | [diff] [blame] | 79 | if (vxlan_port->exts & VXLAN_F_GBP && md->gbp) |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 80 | flags |= TUNNEL_VXLAN_OPT; |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 81 | |
| 82 | /* Save outer tunnel values */ |
| 83 | iph = ip_hdr(skb); |
Thomas Graf | 3511494 | 2015-01-15 03:53:55 +0100 | [diff] [blame] | 84 | key = cpu_to_be64(ntohl(md->vni) >> 8); |
Wenyu Zhang | 8f0aad6 | 2014-11-06 06:51:24 -0800 | [diff] [blame] | 85 | ovs_flow_tun_info_init(&tun_info, iph, |
| 86 | udp_hdr(skb)->source, udp_hdr(skb)->dest, |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 87 | key, flags, &opts, sizeof(opts)); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 88 | |
Jesse Gross | f0b128c | 2014-10-03 15:35:31 -0700 | [diff] [blame] | 89 | ovs_vport_receive(vport, skb, &tun_info); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb) |
| 93 | { |
| 94 | struct vxlan_port *vxlan_port = vxlan_vport(vport); |
| 95 | __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; |
| 96 | |
| 97 | if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port))) |
| 98 | return -EMSGSIZE; |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 99 | |
| 100 | if (vxlan_port->exts) { |
| 101 | struct nlattr *exts; |
| 102 | |
| 103 | exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION); |
| 104 | if (!exts) |
| 105 | return -EMSGSIZE; |
| 106 | |
| 107 | if (vxlan_port->exts & VXLAN_F_GBP && |
| 108 | nla_put_flag(skb, OVS_VXLAN_EXT_GBP)) |
| 109 | return -EMSGSIZE; |
| 110 | |
| 111 | nla_nest_end(skb, exts); |
| 112 | } |
| 113 | |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static void vxlan_tnl_destroy(struct vport *vport) |
| 118 | { |
| 119 | struct vxlan_port *vxlan_port = vxlan_vport(vport); |
| 120 | |
| 121 | vxlan_sock_release(vxlan_port->vs); |
| 122 | |
| 123 | ovs_vport_deferred_free(vport); |
| 124 | } |
| 125 | |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 126 | static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX+1] = { |
| 127 | [OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, }, |
| 128 | }; |
| 129 | |
| 130 | static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr) |
| 131 | { |
| 132 | struct nlattr *exts[OVS_VXLAN_EXT_MAX+1]; |
| 133 | struct vxlan_port *vxlan_port; |
| 134 | int err; |
| 135 | |
| 136 | if (nla_len(attr) < sizeof(struct nlattr)) |
| 137 | return -EINVAL; |
| 138 | |
| 139 | err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy); |
| 140 | if (err < 0) |
| 141 | return err; |
| 142 | |
| 143 | vxlan_port = vxlan_vport(vport); |
| 144 | |
| 145 | if (exts[OVS_VXLAN_EXT_GBP]) |
| 146 | vxlan_port->exts |= VXLAN_F_GBP; |
| 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 151 | static struct vport *vxlan_tnl_create(const struct vport_parms *parms) |
| 152 | { |
| 153 | struct net *net = ovs_dp_get_net(parms->dp); |
| 154 | struct nlattr *options = parms->options; |
| 155 | struct vxlan_port *vxlan_port; |
| 156 | struct vxlan_sock *vs; |
| 157 | struct vport *vport; |
| 158 | struct nlattr *a; |
| 159 | u16 dst_port; |
| 160 | int err; |
| 161 | |
| 162 | if (!options) { |
| 163 | err = -EINVAL; |
| 164 | goto error; |
| 165 | } |
| 166 | a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT); |
| 167 | if (a && nla_len(a) == sizeof(u16)) { |
| 168 | dst_port = nla_get_u16(a); |
| 169 | } else { |
| 170 | /* Require destination port from userspace. */ |
| 171 | err = -EINVAL; |
| 172 | goto error; |
| 173 | } |
| 174 | |
| 175 | vport = ovs_vport_alloc(sizeof(struct vxlan_port), |
| 176 | &ovs_vxlan_vport_ops, parms); |
| 177 | if (IS_ERR(vport)) |
| 178 | return vport; |
| 179 | |
| 180 | vxlan_port = vxlan_vport(vport); |
| 181 | strncpy(vxlan_port->name, parms->name, IFNAMSIZ); |
| 182 | |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 183 | a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION); |
| 184 | if (a) { |
| 185 | err = vxlan_configure_exts(vport, a); |
| 186 | if (err) { |
| 187 | ovs_vport_free(vport); |
| 188 | goto error; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, |
| 193 | vxlan_port->exts); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 194 | if (IS_ERR(vs)) { |
| 195 | ovs_vport_free(vport); |
| 196 | return (void *)vs; |
| 197 | } |
| 198 | vxlan_port->vs = vs; |
| 199 | |
| 200 | return vport; |
| 201 | |
| 202 | error: |
| 203 | return ERR_PTR(err); |
| 204 | } |
| 205 | |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 206 | static int vxlan_ext_gbp(struct sk_buff *skb) |
| 207 | { |
| 208 | const struct ovs_tunnel_info *tun_info; |
| 209 | const struct ovs_vxlan_opts *opts; |
| 210 | |
| 211 | tun_info = OVS_CB(skb)->egress_tun_info; |
| 212 | opts = tun_info->options; |
| 213 | |
| 214 | if (tun_info->tunnel.tun_flags & TUNNEL_VXLAN_OPT && |
| 215 | tun_info->options_len >= sizeof(*opts)) |
| 216 | return opts->gbp; |
| 217 | else |
| 218 | return 0; |
| 219 | } |
| 220 | |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 221 | static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb) |
| 222 | { |
| 223 | struct net *net = ovs_dp_get_net(vport->dp); |
| 224 | struct vxlan_port *vxlan_port = vxlan_vport(vport); |
David Miller | 79b16aa | 2015-04-05 22:19:09 -0400 | [diff] [blame^] | 225 | struct sock *sk = vxlan_port->vs->sock->sk; |
| 226 | __be16 dst_port = inet_sk(sk)->inet_sport; |
Fan Du | 3f4c1d8 | 2015-01-14 13:10:35 +0800 | [diff] [blame] | 227 | const struct ovs_key_ipv4_tunnel *tun_key; |
Thomas Graf | 3511494 | 2015-01-15 03:53:55 +0100 | [diff] [blame] | 228 | struct vxlan_metadata md = {0}; |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 229 | struct rtable *rt; |
| 230 | struct flowi4 fl; |
| 231 | __be16 src_port; |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 232 | __be16 df; |
| 233 | int err; |
Jesse Gross | b869387 | 2015-01-28 16:32:46 -0800 | [diff] [blame] | 234 | u32 vxflags; |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 235 | |
Jesse Gross | f0b128c | 2014-10-03 15:35:31 -0700 | [diff] [blame] | 236 | if (unlikely(!OVS_CB(skb)->egress_tun_info)) { |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 237 | err = -EINVAL; |
| 238 | goto error; |
| 239 | } |
| 240 | |
Jesse Gross | f0b128c | 2014-10-03 15:35:31 -0700 | [diff] [blame] | 241 | tun_key = &OVS_CB(skb)->egress_tun_info->tunnel; |
Fan Du | 3f4c1d8 | 2015-01-14 13:10:35 +0800 | [diff] [blame] | 242 | rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 243 | if (IS_ERR(rt)) { |
| 244 | err = PTR_ERR(rt); |
| 245 | goto error; |
| 246 | } |
| 247 | |
Pravin B Shelar | 8c8b1b8 | 2014-09-15 19:28:44 -0700 | [diff] [blame] | 248 | df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 249 | htons(IP_DF) : 0; |
| 250 | |
WANG Cong | 60ff746 | 2014-05-04 16:39:18 -0700 | [diff] [blame] | 251 | skb->ignore_df = 1; |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 252 | |
Tom Herbert | 535fb8d | 2014-07-01 21:32:49 -0700 | [diff] [blame] | 253 | src_port = udp_flow_src_port(net, skb, 0, 0, true); |
Thomas Graf | 3511494 | 2015-01-15 03:53:55 +0100 | [diff] [blame] | 254 | md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8); |
Thomas Graf | 1dd144c | 2015-01-15 03:53:59 +0100 | [diff] [blame] | 255 | md.gbp = vxlan_ext_gbp(skb); |
Jesse Gross | b869387 | 2015-01-28 16:32:46 -0800 | [diff] [blame] | 256 | vxflags = vxlan_port->exts | |
| 257 | (tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 258 | |
David Miller | 79b16aa | 2015-04-05 22:19:09 -0400 | [diff] [blame^] | 259 | err = vxlan_xmit_skb(rt, sk, skb, fl.saddr, tun_key->ipv4_dst, |
Pravin B Shelar | 8c8b1b8 | 2014-09-15 19:28:44 -0700 | [diff] [blame] | 260 | tun_key->ipv4_tos, tun_key->ipv4_ttl, df, |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 261 | src_port, dst_port, |
Jesse Gross | b869387 | 2015-01-28 16:32:46 -0800 | [diff] [blame] | 262 | &md, false, vxflags); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 263 | if (err < 0) |
| 264 | ip_rt_put(rt); |
Pravin B Shelar | 997e068 | 2014-12-23 16:20:32 -0800 | [diff] [blame] | 265 | return err; |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 266 | error: |
Pravin B Shelar | 997e068 | 2014-12-23 16:20:32 -0800 | [diff] [blame] | 267 | kfree_skb(skb); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 268 | return err; |
| 269 | } |
| 270 | |
Wenyu Zhang | 8f0aad6 | 2014-11-06 06:51:24 -0800 | [diff] [blame] | 271 | static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb, |
| 272 | struct ovs_tunnel_info *egress_tun_info) |
| 273 | { |
| 274 | struct net *net = ovs_dp_get_net(vport->dp); |
| 275 | struct vxlan_port *vxlan_port = vxlan_vport(vport); |
| 276 | __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; |
| 277 | __be16 src_port; |
| 278 | int port_min; |
| 279 | int port_max; |
| 280 | |
| 281 | inet_get_local_port_range(net, &port_min, &port_max); |
| 282 | src_port = udp_flow_src_port(net, skb, 0, 0, true); |
| 283 | |
| 284 | return ovs_tunnel_get_egress_info(egress_tun_info, net, |
| 285 | OVS_CB(skb)->egress_tun_info, |
| 286 | IPPROTO_UDP, skb->mark, |
| 287 | src_port, dst_port); |
| 288 | } |
| 289 | |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 290 | static const char *vxlan_get_name(const struct vport *vport) |
| 291 | { |
| 292 | struct vxlan_port *vxlan_port = vxlan_vport(vport); |
| 293 | return vxlan_port->name; |
| 294 | } |
| 295 | |
Thomas Graf | 62b9c8d | 2014-10-22 17:29:06 +0200 | [diff] [blame] | 296 | static struct vport_ops ovs_vxlan_vport_ops = { |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 297 | .type = OVS_VPORT_TYPE_VXLAN, |
| 298 | .create = vxlan_tnl_create, |
| 299 | .destroy = vxlan_tnl_destroy, |
| 300 | .get_name = vxlan_get_name, |
| 301 | .get_options = vxlan_get_options, |
| 302 | .send = vxlan_tnl_send, |
Wenyu Zhang | 8f0aad6 | 2014-11-06 06:51:24 -0800 | [diff] [blame] | 303 | .get_egress_tun_info = vxlan_get_egress_tun_info, |
Thomas Graf | 62b9c8d | 2014-10-22 17:29:06 +0200 | [diff] [blame] | 304 | .owner = THIS_MODULE, |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 305 | }; |
Thomas Graf | 62b9c8d | 2014-10-22 17:29:06 +0200 | [diff] [blame] | 306 | |
| 307 | static int __init ovs_vxlan_tnl_init(void) |
| 308 | { |
| 309 | return ovs_vport_ops_register(&ovs_vxlan_vport_ops); |
| 310 | } |
| 311 | |
| 312 | static void __exit ovs_vxlan_tnl_exit(void) |
| 313 | { |
| 314 | ovs_vport_ops_unregister(&ovs_vxlan_vport_ops); |
| 315 | } |
| 316 | |
| 317 | module_init(ovs_vxlan_tnl_init); |
| 318 | module_exit(ovs_vxlan_tnl_exit); |
| 319 | |
| 320 | MODULE_DESCRIPTION("OVS: VXLAN switching port"); |
| 321 | MODULE_LICENSE("GPL"); |
| 322 | MODULE_ALIAS("vport-type-4"); |