/* * Copyright (c) 2013 Nicira, Inc. * Copyright (c) 2013 Cisco Systems, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/in.h> #include <linux/ip.h> #include <linux/net.h> #include <linux/rculist.h> #include <linux/udp.h> #include <net/icmp.h> #include <net/ip.h> #include <net/udp.h> #include <net/ip_tunnels.h> #include <net/rtnetlink.h> #include <net/route.h> #include <net/dsfield.h> #include <net/inet_ecn.h> #include <net/net_namespace.h> #include <net/netns/generic.h> #include <net/vxlan.h> #include "datapath.h" #include "vport.h" /** * struct vxlan_port - Keeps track of open UDP ports * @vs: vxlan_sock created for the port. * @name: vport name. */ struct vxlan_port { struct vxlan_sock *vs; char name[IFNAMSIZ]; }; static inline struct vxlan_port *vxlan_vport(const struct vport *vport) { return vport_priv(vport); } /* Called with rcu_read_lock and BH disabled. */ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, __be32 vx_vni) { struct ovs_key_ipv4_tunnel tun_key; struct vport *vport = vs->data; struct iphdr *iph; __be64 key; /* Save outer tunnel values */ iph = ip_hdr(skb); key = cpu_to_be64(ntohl(vx_vni) >> 8); ovs_flow_tun_key_init(&tun_key, iph, key, TUNNEL_KEY); ovs_vport_receive(vport, skb, &tun_key); } static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb) { struct vxlan_port *vxlan_port = vxlan_vport(vport); __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port))) return -EMSGSIZE; return 0; } static void vxlan_tnl_destroy(struct vport *vport) { struct vxlan_port *vxlan_port = vxlan_vport(vport); vxlan_sock_release(vxlan_port->vs); ovs_vport_deferred_free(vport); } static struct vport *vxlan_tnl_create(const struct vport_parms *parms) { struct net *net = ovs_dp_get_net(parms->dp); struct nlattr *options = parms->options; struct vxlan_port *vxlan_port; struct vxlan_sock *vs; struct vport *vport; struct nlattr *a; u16 dst_port; int err; 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 vxlan_port), &ovs_vxlan_vport_ops, parms); if (IS_ERR(vport)) return vport; vxlan_port = vxlan_vport(vport); strncpy(vxlan_port->name, parms->name, IFNAMSIZ); vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true, false); if (IS_ERR(vs)) { ovs_vport_free(vport); return (void *)vs; } vxlan_port->vs = vs; return vport; error: return ERR_PTR(err); } static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb) { struct net *net = ovs_dp_get_net(vport->dp); struct vxlan_port *vxlan_port = vxlan_vport(vport); __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; struct rtable *rt; struct flowi4 fl; __be16 src_port; int port_min; int port_max; __be16 df; int err; if (unlikely(!OVS_CB(skb)->tun_key)) { err = -EINVAL; goto error; } /* Route lookup */ memset(&fl, 0, sizeof(fl)); fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst; fl.saddr = OVS_CB(skb)->tun_key->ipv4_src; fl.flowi4_tos = RT_TOS(OVS_CB(skb)->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 = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; skb->local_df = 1; inet_get_local_port_range(net, &port_min, &port_max); src_port = vxlan_src_port(port_min, port_max, skb); err = vxlan_xmit_skb(vxlan_port->vs, rt, skb, fl.saddr, OVS_CB(skb)->tun_key->ipv4_dst, OVS_CB(skb)->tun_key->ipv4_tos, OVS_CB(skb)->tun_key->ipv4_ttl, df, src_port, dst_port, htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8)); if (err < 0) ip_rt_put(rt); error: return err; } static const char *vxlan_get_name(const struct vport *vport) { struct vxlan_port *vxlan_port = vxlan_vport(vport); return vxlan_port->name; } const struct vport_ops ovs_vxlan_vport_ops = { .type = OVS_VPORT_TYPE_VXLAN, .create = vxlan_tnl_create, .destroy = vxlan_tnl_destroy, .get_name = vxlan_get_name, .get_options = vxlan_get_options, .send = vxlan_tnl_send, };