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/*
* Copyright (c) 2014 Nicira, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/version.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/net.h>
#include <linux/rculist.h>
#include <linux/udp.h>
#include <linux/if_vlan.h>
#include <net/geneve.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/udp.h>
#include <net/xfrm.h>
#include "datapath.h"
#include "vport.h"
/**
* struct geneve_port - Keeps track of open UDP ports
* @sock: The socket created for this port number.
* @name: vport name.
*/
struct geneve_port {
struct geneve_sock *gs;
char name[IFNAMSIZ];
};
static LIST_HEAD(geneve_ports);
static inline struct geneve_port *geneve_vport(const struct vport *vport)
{
return vport_priv(vport);
}
static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
{
return (struct genevehdr *)(udp_hdr(skb) + 1);
}
/* Convert 64 bit tunnel ID to 24 bit VNI. */
static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
{
#ifdef __BIG_ENDIAN
vni[0] = (__force __u8)(tun_id >> 16);
vni[1] = (__force __u8)(tun_id >> 8);
vni[2] = (__force __u8)tun_id;
#else
vni[0] = (__force __u8)((__force u64)tun_id >> 40);
vni[1] = (__force __u8)((__force u64)tun_id >> 48);
vni[2] = (__force __u8)((__force u64)tun_id >> 56);
#endif
}
/* Convert 24 bit VNI to 64 bit tunnel ID. */
static __be64 vni_to_tunnel_id(__u8 *vni)
{
#ifdef __BIG_ENDIAN
return (vni[0] << 16) | (vni[1] << 8) | vni[2];
#else
return (__force __be64)(((__force u64)vni[0] << 40) |
((__force u64)vni[1] << 48) |
((__force u64)vni[2] << 56));
#endif
}
static void geneve_rcv(struct geneve_sock *gs, struct sk_buff *skb)
{
struct vport *vport = gs->rcv_data;
struct genevehdr *geneveh = geneve_hdr(skb);
int opts_len;
struct ovs_tunnel_info tun_info;
__be64 key;
__be16 flags;
opts_len = geneveh->opt_len * 4;
flags = TUNNEL_KEY | TUNNEL_OPTIONS_PRESENT |
(udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0) |
(geneveh->oam ? TUNNEL_OAM : 0) |
(geneveh->critical ? TUNNEL_CRIT_OPT : 0);
key = vni_to_tunnel_id(geneveh->vni);
ovs_flow_tun_info_init(&tun_info, ip_hdr(skb), key, flags,
geneveh->options, opts_len);
ovs_vport_receive(vport, skb, &tun_info);
}
static int geneve_get_options(const struct vport *vport,
struct sk_buff *skb)
{
struct geneve_port *geneve_port = geneve_vport(vport);
struct inet_sock *sk = inet_sk(geneve_port->gs->sock->sk);
if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(sk->inet_sport)))
return -EMSGSIZE;
return 0;
}
static void geneve_tnl_destroy(struct vport *vport)
{
struct geneve_port *geneve_port = geneve_vport(vport);
geneve_sock_release(geneve_port->gs);
ovs_vport_deferred_free(vport);
}
static struct vport *geneve_tnl_create(const struct vport_parms *parms)
{
struct net *net = ovs_dp_get_net(parms->dp);
struct nlattr *options = parms->options;
struct geneve_port *geneve_port;
struct geneve_sock *gs;
struct vport *vport;
struct nlattr *a;
int err;
u16 dst_port;
if (!options) {
err = -EINVAL;
goto error;
}
a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
if (a && nla_len(a) == sizeof(u16)) {
dst_port = nla_get_u16(a);
} else {
/* Require destination port from userspace. */
err = -EINVAL;
goto error;
}
vport = ovs_vport_alloc(sizeof(struct geneve_port),
&ovs_geneve_vport_ops, parms);
if (IS_ERR(vport))
return vport;
geneve_port = geneve_vport(vport);
strncpy(geneve_port->name, parms->name, IFNAMSIZ);
gs = geneve_sock_add(net, htons(dst_port), geneve_rcv, vport, true, 0);
if (IS_ERR(gs)) {
ovs_vport_free(vport);
return (void *)gs;
}
geneve_port->gs = gs;
return vport;
error:
return ERR_PTR(err);
}
static int geneve_tnl_send(struct vport *vport, struct sk_buff *skb)
{
struct ovs_key_ipv4_tunnel *tun_key;
struct ovs_tunnel_info *tun_info;
struct net *net = ovs_dp_get_net(vport->dp);
struct geneve_port *geneve_port = geneve_vport(vport);
__be16 dport = inet_sk(geneve_port->gs->sock->sk)->inet_sport;
__be16 sport;
struct rtable *rt;
struct flowi4 fl;
u8 vni[3];
__be16 df;
int err;
tun_info = OVS_CB(skb)->egress_tun_info;
if (unlikely(!tun_info)) {
err = -EINVAL;
goto error;
}
tun_key = &tun_info->tunnel;
/* Route lookup */
memset(&fl, 0, sizeof(fl));
fl.daddr = tun_key->ipv4_dst;
fl.saddr = tun_key->ipv4_src;
fl.flowi4_tos = RT_TOS(tun_key->ipv4_tos);
fl.flowi4_mark = skb->mark;
fl.flowi4_proto = IPPROTO_UDP;
rt = ip_route_output_key(net, &fl);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);
goto error;
}
df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true);
tunnel_id_to_vni(tun_key->tun_id, vni);
skb->ignore_df = 1;
err = geneve_xmit_skb(geneve_port->gs, rt, skb, fl.saddr,
tun_key->ipv4_dst, tun_key->ipv4_tos,
tun_key->ipv4_ttl, df, sport, dport,
tun_key->tun_flags, vni,
tun_info->options_len, (u8 *)tun_info->options,
false);
if (err < 0)
ip_rt_put(rt);
error:
return err;
}
static const char *geneve_get_name(const struct vport *vport)
{
struct geneve_port *geneve_port = geneve_vport(vport);
return geneve_port->name;
}
const struct vport_ops ovs_geneve_vport_ops = {
.type = OVS_VPORT_TYPE_GENEVE,
.create = geneve_tnl_create,
.destroy = geneve_tnl_destroy,
.get_name = geneve_get_name,
.get_options = geneve_get_options,
.send = geneve_tnl_send,
};
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