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/rtnetlink.h> 33 #include <net/route.h> 34 #include <net/dsfield.h> 35 #include <net/inet_ecn.h> 36 #include <net/net_namespace.h> 37 #include <net/netns/generic.h> 38 #include <net/vxlan.h> 39 40 #include "datapath.h" 41 #include "vport.h" 42 43 /** 44 * struct vxlan_port - Keeps track of open UDP ports 45 * @vs: vxlan_sock created for the port. 46 * @name: vport name. 47 */ 48 struct vxlan_port { 49 struct vxlan_sock *vs; 50 char name[IFNAMSIZ]; 51 }; 52 53 static inline struct vxlan_port *vxlan_vport(const struct vport *vport) 54 { 55 return vport_priv(vport); 56 } 57 58 /* Called with rcu_read_lock and BH disabled. */ 59 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni) 60 { 61 struct ovs_key_ipv4_tunnel tun_key; 62 struct vport *vport = vs->data; 63 struct iphdr *iph; 64 __be64 key; 65 66 /* Save outer tunnel values */ 67 iph = ip_hdr(skb); 68 key = cpu_to_be64(ntohl(vx_vni) >> 8); 69 ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY); 70 71 ovs_vport_receive(vport, skb, &tun_key); 72 } 73 74 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb) 75 { 76 struct vxlan_port *vxlan_port = vxlan_vport(vport); 77 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; 78 79 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port))) 80 return -EMSGSIZE; 81 return 0; 82 } 83 84 static void vxlan_tnl_destroy(struct vport *vport) 85 { 86 struct vxlan_port *vxlan_port = vxlan_vport(vport); 87 88 vxlan_sock_release(vxlan_port->vs); 89 90 ovs_vport_deferred_free(vport); 91 } 92 93 static struct vport *vxlan_tnl_create(const struct vport_parms *parms) 94 { 95 struct net *net = ovs_dp_get_net(parms->dp); 96 struct nlattr *options = parms->options; 97 struct vxlan_port *vxlan_port; 98 struct vxlan_sock *vs; 99 struct vport *vport; 100 struct nlattr *a; 101 u16 dst_port; 102 int err; 103 104 if (!options) { 105 err = -EINVAL; 106 goto error; 107 } 108 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT); 109 if (a && nla_len(a) == sizeof(u16)) { 110 dst_port = nla_get_u16(a); 111 } else { 112 /* Require destination port from userspace. */ 113 err = -EINVAL; 114 goto error; 115 } 116 117 vport = ovs_vport_alloc(sizeof(struct vxlan_port), 118 &ovs_vxlan_vport_ops, parms); 119 if (IS_ERR(vport)) 120 return vport; 121 122 vxlan_port = vxlan_vport(vport); 123 strncpy(vxlan_port->name, parms->name, IFNAMSIZ); 124 125 vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, false); 126 if (IS_ERR(vs)) { 127 ovs_vport_free(vport); 128 return (void *)vs; 129 } 130 vxlan_port->vs = vs; 131 132 return vport; 133 134 error: 135 return ERR_PTR(err); 136 } 137 138 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb) 139 { 140 struct net *net = ovs_dp_get_net(vport->dp); 141 struct vxlan_port *vxlan_port = vxlan_vport(vport); 142 __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; 143 struct rtable *rt; 144 struct flowi4 fl; 145 __be16 src_port; 146 int port_min; 147 int port_max; 148 __be16 df; 149 int err; 150 151 if (unlikely(!OVS_CB(skb)->tun_key)) { 152 err = -EINVAL; 153 goto error; 154 } 155 156 /* Route lookup */ 157 memset(&fl, 0, sizeof(fl)); 158 fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst; 159 fl.saddr = OVS_CB(skb)->tun_key->ipv4_src; 160 fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos); 161 fl.flowi4_mark = skb->mark; 162 fl.flowi4_proto = IPPROTO_UDP; 163 164 rt = ip_route_output_key(net, &fl); 165 if (IS_ERR(rt)) { 166 err = PTR_ERR(rt); 167 goto error; 168 } 169 170 df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? 171 htons(IP_DF) : 0; 172 173 skb->local_df = 1; 174 175 inet_get_local_port_range(net, &port_min, &port_max); 176 src_port = vxlan_src_port(port_min, port_max, skb); 177 178 err = vxlan_xmit_skb(vxlan_port->vs, rt, skb, 179 fl.saddr, OVS_CB(skb)->tun_key->ipv4_dst, 180 OVS_CB(skb)->tun_key->ipv4_tos, 181 OVS_CB(skb)->tun_key->ipv4_ttl, df, 182 src_port, dst_port, 183 htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8)); 184 if (err < 0) 185 ip_rt_put(rt); 186 error: 187 return err; 188 } 189 190 static const char *vxlan_get_name(const struct vport *vport) 191 { 192 struct vxlan_port *vxlan_port = vxlan_vport(vport); 193 return vxlan_port->name; 194 } 195 196 const struct vport_ops ovs_vxlan_vport_ops = { 197 .type = OVS_VPORT_TYPE_VXLAN, 198 .create = vxlan_tnl_create, 199 .destroy = vxlan_tnl_destroy, 200 .get_name = vxlan_get_name, 201 .get_options = vxlan_get_options, 202 .send = vxlan_tnl_send, 203 }; 204