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 44 /** 45 * struct vxlan_port - Keeps track of open UDP ports 46 * @vs: vxlan_sock created for the port. 47 * @name: vport name. 48 */ 49 struct vxlan_port { 50 struct vxlan_sock *vs; 51 char name[IFNAMSIZ]; 52 }; 53 54 static struct vport_ops ovs_vxlan_vport_ops; 55 56 static inline struct vxlan_port *vxlan_vport(const struct vport *vport) 57 { 58 return vport_priv(vport); 59 } 60 61 /* Called with rcu_read_lock and BH disabled. */ 62 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni) 63 { 64 struct ovs_tunnel_info tun_info; 65 struct vport *vport = vs->data; 66 struct iphdr *iph; 67 __be64 key; 68 69 /* Save outer tunnel values */ 70 iph = ip_hdr(skb); 71 key = cpu_to_be64(ntohl(vx_vni) >> 8); 72 ovs_flow_tun_info_init(&tun_info, iph, 73 udp_hdr(skb)->source, udp_hdr(skb)->dest, 74 key, TUNNEL_KEY, NULL, 0); 75 76 ovs_vport_receive(vport, skb, &tun_info); 77 } 78 79 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb) 80 { 81 struct vxlan_port *vxlan_port = vxlan_vport(vport); 82 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; 83 84 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port))) 85 return -EMSGSIZE; 86 return 0; 87 } 88 89 static void vxlan_tnl_destroy(struct vport *vport) 90 { 91 struct vxlan_port *vxlan_port = vxlan_vport(vport); 92 93 vxlan_sock_release(vxlan_port->vs); 94 95 ovs_vport_deferred_free(vport); 96 } 97 98 static struct vport *vxlan_tnl_create(const struct vport_parms *parms) 99 { 100 struct net *net = ovs_dp_get_net(parms->dp); 101 struct nlattr *options = parms->options; 102 struct vxlan_port *vxlan_port; 103 struct vxlan_sock *vs; 104 struct vport *vport; 105 struct nlattr *a; 106 u16 dst_port; 107 int err; 108 109 if (!options) { 110 err = -EINVAL; 111 goto error; 112 } 113 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT); 114 if (a && nla_len(a) == sizeof(u16)) { 115 dst_port = nla_get_u16(a); 116 } else { 117 /* Require destination port from userspace. */ 118 err = -EINVAL; 119 goto error; 120 } 121 122 vport = ovs_vport_alloc(sizeof(struct vxlan_port), 123 &ovs_vxlan_vport_ops, parms); 124 if (IS_ERR(vport)) 125 return vport; 126 127 vxlan_port = vxlan_vport(vport); 128 strncpy(vxlan_port->name, parms->name, IFNAMSIZ); 129 130 vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, 0); 131 if (IS_ERR(vs)) { 132 ovs_vport_free(vport); 133 return (void *)vs; 134 } 135 vxlan_port->vs = vs; 136 137 return vport; 138 139 error: 140 return ERR_PTR(err); 141 } 142 143 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb) 144 { 145 struct net *net = ovs_dp_get_net(vport->dp); 146 struct vxlan_port *vxlan_port = vxlan_vport(vport); 147 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; 148 struct ovs_key_ipv4_tunnel *tun_key; 149 struct rtable *rt; 150 struct flowi4 fl; 151 __be16 src_port; 152 __be16 df; 153 int err; 154 155 if (unlikely(!OVS_CB(skb)->egress_tun_info)) { 156 err = -EINVAL; 157 goto error; 158 } 159 160 tun_key = &OVS_CB(skb)->egress_tun_info->tunnel; 161 /* Route lookup */ 162 memset(&fl, 0, sizeof(fl)); 163 fl.daddr = tun_key->ipv4_dst; 164 fl.saddr = tun_key->ipv4_src; 165 fl.flowi4_tos = RT_TOS(tun_key->ipv4_tos); 166 fl.flowi4_mark = skb->mark; 167 fl.flowi4_proto = IPPROTO_UDP; 168 169 rt = ip_route_output_key(net, &fl); 170 if (IS_ERR(rt)) { 171 err = PTR_ERR(rt); 172 goto error; 173 } 174 175 df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? 176 htons(IP_DF) : 0; 177 178 skb->ignore_df = 1; 179 180 src_port = udp_flow_src_port(net, skb, 0, 0, true); 181 182 err = vxlan_xmit_skb(vxlan_port->vs, rt, skb, 183 fl.saddr, tun_key->ipv4_dst, 184 tun_key->ipv4_tos, tun_key->ipv4_ttl, df, 185 src_port, dst_port, 186 htonl(be64_to_cpu(tun_key->tun_id) << 8), 187 false); 188 if (err < 0) 189 ip_rt_put(rt); 190 return err; 191 error: 192 kfree_skb(skb); 193 return err; 194 } 195 196 static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb, 197 struct ovs_tunnel_info *egress_tun_info) 198 { 199 struct net *net = ovs_dp_get_net(vport->dp); 200 struct vxlan_port *vxlan_port = vxlan_vport(vport); 201 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; 202 __be16 src_port; 203 int port_min; 204 int port_max; 205 206 inet_get_local_port_range(net, &port_min, &port_max); 207 src_port = udp_flow_src_port(net, skb, 0, 0, true); 208 209 return ovs_tunnel_get_egress_info(egress_tun_info, net, 210 OVS_CB(skb)->egress_tun_info, 211 IPPROTO_UDP, skb->mark, 212 src_port, dst_port); 213 } 214 215 static const char *vxlan_get_name(const struct vport *vport) 216 { 217 struct vxlan_port *vxlan_port = vxlan_vport(vport); 218 return vxlan_port->name; 219 } 220 221 static struct vport_ops ovs_vxlan_vport_ops = { 222 .type = OVS_VPORT_TYPE_VXLAN, 223 .create = vxlan_tnl_create, 224 .destroy = vxlan_tnl_destroy, 225 .get_name = vxlan_get_name, 226 .get_options = vxlan_get_options, 227 .send = vxlan_tnl_send, 228 .get_egress_tun_info = vxlan_get_egress_tun_info, 229 .owner = THIS_MODULE, 230 }; 231 232 static int __init ovs_vxlan_tnl_init(void) 233 { 234 return ovs_vport_ops_register(&ovs_vxlan_vport_ops); 235 } 236 237 static void __exit ovs_vxlan_tnl_exit(void) 238 { 239 ovs_vport_ops_unregister(&ovs_vxlan_vport_ops); 240 } 241 242 module_init(ovs_vxlan_tnl_init); 243 module_exit(ovs_vxlan_tnl_exit); 244 245 MODULE_DESCRIPTION("OVS: VXLAN switching port"); 246 MODULE_LICENSE("GPL"); 247 MODULE_ALIAS("vport-type-4"); 248