1 /* 2 * Copyright (c) 2013 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 28 #include <net/icmp.h> 29 #include <net/ip.h> 30 #include <net/udp.h> 31 #include <net/ip_tunnels.h> 32 #include <net/udp.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 inline struct vxlan_port *vxlan_vport(const struct vport *vport) 55 { 56 return vport_priv(vport); 57 } 58 59 /* Called with rcu_read_lock and BH disabled. */ 60 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni) 61 { 62 struct ovs_key_ipv4_tunnel tun_key; 63 struct vport *vport = vs->data; 64 struct iphdr *iph; 65 __be64 key; 66 67 /* Save outer tunnel values */ 68 iph = ip_hdr(skb); 69 key = cpu_to_be64(ntohl(vx_vni) >> 8); 70 ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY); 71 72 ovs_vport_receive(vport, skb, &tun_key); 73 } 74 75 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb) 76 { 77 struct vxlan_port *vxlan_port = vxlan_vport(vport); 78 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; 79 80 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port))) 81 return -EMSGSIZE; 82 return 0; 83 } 84 85 static void vxlan_tnl_destroy(struct vport *vport) 86 { 87 struct vxlan_port *vxlan_port = vxlan_vport(vport); 88 89 vxlan_sock_release(vxlan_port->vs); 90 91 ovs_vport_deferred_free(vport); 92 } 93 94 static struct vport *vxlan_tnl_create(const struct vport_parms *parms) 95 { 96 struct net *net = ovs_dp_get_net(parms->dp); 97 struct nlattr *options = parms->options; 98 struct vxlan_port *vxlan_port; 99 struct vxlan_sock *vs; 100 struct vport *vport; 101 struct nlattr *a; 102 u16 dst_port; 103 int err; 104 105 if (!options) { 106 err = -EINVAL; 107 goto error; 108 } 109 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT); 110 if (a && nla_len(a) == sizeof(u16)) { 111 dst_port = nla_get_u16(a); 112 } else { 113 /* Require destination port from userspace. */ 114 err = -EINVAL; 115 goto error; 116 } 117 118 vport = ovs_vport_alloc(sizeof(struct vxlan_port), 119 &ovs_vxlan_vport_ops, parms); 120 if (IS_ERR(vport)) 121 return vport; 122 123 vxlan_port = vxlan_vport(vport); 124 strncpy(vxlan_port->name, parms->name, IFNAMSIZ); 125 126 vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, false); 127 if (IS_ERR(vs)) { 128 ovs_vport_free(vport); 129 return (void *)vs; 130 } 131 vxlan_port->vs = vs; 132 133 return vport; 134 135 error: 136 return ERR_PTR(err); 137 } 138 139 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb) 140 { 141 struct net *net = ovs_dp_get_net(vport->dp); 142 struct vxlan_port *vxlan_port = vxlan_vport(vport); 143 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; 144 struct rtable *rt; 145 struct flowi4 fl; 146 __be16 src_port; 147 int port_min; 148 int port_max; 149 __be16 df; 150 int err; 151 152 if (unlikely(!OVS_CB(skb)->tun_key)) { 153 err = -EINVAL; 154 goto error; 155 } 156 157 /* Route lookup */ 158 memset(&fl, 0, sizeof(fl)); 159 fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst; 160 fl.saddr = OVS_CB(skb)->tun_key->ipv4_src; 161 fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos); 162 fl.flowi4_mark = skb->mark; 163 fl.flowi4_proto = IPPROTO_UDP; 164 165 rt = ip_route_output_key(net, &fl); 166 if (IS_ERR(rt)) { 167 err = PTR_ERR(rt); 168 goto error; 169 } 170 171 df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? 172 htons(IP_DF) : 0; 173 174 skb->local_df = 1; 175 176 inet_get_local_port_range(&port_min, &port_max); 177 src_port = vxlan_src_port(port_min, port_max, skb); 178 179 err = vxlan_xmit_skb(vxlan_port->vs, rt, skb, 180 fl.saddr, OVS_CB(skb)->tun_key->ipv4_dst, 181 OVS_CB(skb)->tun_key->ipv4_tos, 182 OVS_CB(skb)->tun_key->ipv4_ttl, df, 183 src_port, dst_port, 184 htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8)); 185 if (err < 0) 186 ip_rt_put(rt); 187 error: 188 return err; 189 } 190 191 static const char *vxlan_get_name(const struct vport *vport) 192 { 193 struct vxlan_port *vxlan_port = vxlan_vport(vport); 194 return vxlan_port->name; 195 } 196 197 const struct vport_ops ovs_vxlan_vport_ops = { 198 .type = OVS_VPORT_TYPE_VXLAN, 199 .create = vxlan_tnl_create, 200 .destroy = vxlan_tnl_destroy, 201 .get_name = vxlan_get_name, 202 .get_options = vxlan_get_options, 203 .send = vxlan_tnl_send, 204 }; 205