1 /* 2 * Copyright (c) 2014 Nicira, Inc. 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> 27 #include <linux/module.h> 28 29 #include <net/icmp.h> 30 #include <net/ip.h> 31 #include <net/udp.h> 32 #include <net/ip_tunnels.h> 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" 43 #include "vport-vxlan.h" 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]; 53 u32 exts; /* VXLAN_F_* in <net/vxlan.h> */ 54 }; 55 56 static struct vport_ops ovs_vxlan_vport_ops; 57 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. */ 64 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, 65 struct vxlan_metadata *md) 66 { 67 struct ovs_tunnel_info tun_info; 68 struct vxlan_port *vxlan_port; 69 struct vport *vport = vs->data; 70 struct iphdr *iph; 71 struct ovs_vxlan_opts opts = { 72 .gbp = md->gbp, 73 }; 74 __be64 key; 75 __be16 flags; 76 77 flags = TUNNEL_KEY | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0); 78 vxlan_port = vxlan_vport(vport); 79 if (vxlan_port->exts & VXLAN_F_GBP && md->gbp) 80 flags |= TUNNEL_VXLAN_OPT; 81 82 /* Save outer tunnel values */ 83 iph = ip_hdr(skb); 84 key = cpu_to_be64(ntohl(md->vni) >> 8); 85 ovs_flow_tun_info_init(&tun_info, iph, 86 udp_hdr(skb)->source, udp_hdr(skb)->dest, 87 key, flags, &opts, sizeof(opts)); 88 89 ovs_vport_receive(vport, skb, &tun_info); 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; 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 } 113 114 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 } 125 126 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 } 150 151 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); 182 183 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); 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 } 205 206 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 } 220 221 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); 225 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; 226 const struct ovs_key_ipv4_tunnel *tun_key; 227 struct vxlan_metadata md = {0}; 228 struct rtable *rt; 229 struct flowi4 fl; 230 __be16 src_port; 231 __be16 df; 232 int err; 233 u32 vxflags; 234 235 if (unlikely(!OVS_CB(skb)->egress_tun_info)) { 236 err = -EINVAL; 237 goto error; 238 } 239 240 tun_key = &OVS_CB(skb)->egress_tun_info->tunnel; 241 rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP); 242 if (IS_ERR(rt)) { 243 err = PTR_ERR(rt); 244 goto error; 245 } 246 247 df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? 248 htons(IP_DF) : 0; 249 250 skb->ignore_df = 1; 251 252 src_port = udp_flow_src_port(net, skb, 0, 0, true); 253 md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8); 254 md.gbp = vxlan_ext_gbp(skb); 255 vxflags = vxlan_port->exts | 256 (tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0); 257 258 err = vxlan_xmit_skb(rt, skb, fl.saddr, tun_key->ipv4_dst, 259 tun_key->ipv4_tos, tun_key->ipv4_ttl, df, 260 src_port, dst_port, 261 &md, false, vxflags); 262 if (err < 0) 263 ip_rt_put(rt); 264 return err; 265 error: 266 kfree_skb(skb); 267 return err; 268 } 269 270 static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb, 271 struct ovs_tunnel_info *egress_tun_info) 272 { 273 struct net *net = ovs_dp_get_net(vport->dp); 274 struct vxlan_port *vxlan_port = vxlan_vport(vport); 275 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; 276 __be16 src_port; 277 int port_min; 278 int port_max; 279 280 inet_get_local_port_range(net, &port_min, &port_max); 281 src_port = udp_flow_src_port(net, skb, 0, 0, true); 282 283 return ovs_tunnel_get_egress_info(egress_tun_info, net, 284 OVS_CB(skb)->egress_tun_info, 285 IPPROTO_UDP, skb->mark, 286 src_port, dst_port); 287 } 288 289 static const char *vxlan_get_name(const struct vport *vport) 290 { 291 struct vxlan_port *vxlan_port = vxlan_vport(vport); 292 return vxlan_port->name; 293 } 294 295 static struct vport_ops ovs_vxlan_vport_ops = { 296 .type = OVS_VPORT_TYPE_VXLAN, 297 .create = vxlan_tnl_create, 298 .destroy = vxlan_tnl_destroy, 299 .get_name = vxlan_get_name, 300 .get_options = vxlan_get_options, 301 .send = vxlan_tnl_send, 302 .get_egress_tun_info = vxlan_get_egress_tun_info, 303 .owner = THIS_MODULE, 304 }; 305 306 static int __init ovs_vxlan_tnl_init(void) 307 { 308 return ovs_vport_ops_register(&ovs_vxlan_vport_ops); 309 } 310 311 static void __exit ovs_vxlan_tnl_exit(void) 312 { 313 ovs_vport_ops_unregister(&ovs_vxlan_vport_ops); 314 } 315 316 module_init(ovs_vxlan_tnl_init); 317 module_exit(ovs_vxlan_tnl_exit); 318 319 MODULE_DESCRIPTION("OVS: VXLAN switching port"); 320 MODULE_LICENSE("GPL"); 321 MODULE_ALIAS("vport-type-4"); 322