Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 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> |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 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 | |
Cong Wang | e4c7ed4 | 2013-08-31 13:44:33 +0800 | [diff] [blame] | 125 | vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, false); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 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 | |
Eric W. Biederman | 0bbf87d | 2013-09-28 14:10:59 -0700 | [diff] [blame] | 175 | inet_get_local_port_range(net, &port_min, &port_max); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 176 | src_port = vxlan_src_port(port_min, port_max, skb); |
| 177 | |
Nicolas Dichtel | 1179618 | 2013-09-02 15:34:55 +0200 | [diff] [blame] | 178 | err = vxlan_xmit_skb(vxlan_port->vs, rt, skb, |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 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, |
Nicolas Dichtel | f01ec1c | 2014-04-24 10:02:49 +0200 | [diff] [blame] | 183 | htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8), |
| 184 | false); |
Pravin B Shelar | 5826484 | 2013-08-19 11:23:34 -0700 | [diff] [blame] | 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 | }; |