forked from Minki/linux
b8693877ae
Currently, it isn't possible to request checksums on the outer UDP header of tunnels - the TUNNEL_CSUM flag is ignored. This adds support for requesting that UDP checksums be computed on transmit and properly reported if they are present on receive. Signed-off-by: Jesse Gross <jesse@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
322 lines
7.8 KiB
C
322 lines
7.8 KiB
C
/*
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* Copyright (c) 2014 Nicira, Inc.
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* Copyright (c) 2013 Cisco Systems, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/net.h>
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#include <linux/rculist.h>
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#include <linux/udp.h>
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#include <linux/module.h>
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#include <net/icmp.h>
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#include <net/ip.h>
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#include <net/udp.h>
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#include <net/ip_tunnels.h>
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#include <net/rtnetlink.h>
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#include <net/route.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/vxlan.h>
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#include "datapath.h"
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#include "vport.h"
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#include "vport-vxlan.h"
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/**
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* struct vxlan_port - Keeps track of open UDP ports
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* @vs: vxlan_sock created for the port.
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* @name: vport name.
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*/
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struct vxlan_port {
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struct vxlan_sock *vs;
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char name[IFNAMSIZ];
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u32 exts; /* VXLAN_F_* in <net/vxlan.h> */
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};
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static struct vport_ops ovs_vxlan_vport_ops;
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static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
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{
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return vport_priv(vport);
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}
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/* Called with rcu_read_lock and BH disabled. */
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static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
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struct vxlan_metadata *md)
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{
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struct ovs_tunnel_info tun_info;
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struct vxlan_port *vxlan_port;
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struct vport *vport = vs->data;
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struct iphdr *iph;
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struct ovs_vxlan_opts opts = {
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.gbp = md->gbp,
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};
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__be64 key;
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__be16 flags;
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flags = TUNNEL_KEY | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0);
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vxlan_port = vxlan_vport(vport);
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if (vxlan_port->exts & VXLAN_F_GBP)
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flags |= TUNNEL_VXLAN_OPT;
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/* Save outer tunnel values */
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iph = ip_hdr(skb);
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key = cpu_to_be64(ntohl(md->vni) >> 8);
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ovs_flow_tun_info_init(&tun_info, iph,
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udp_hdr(skb)->source, udp_hdr(skb)->dest,
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key, flags, &opts, sizeof(opts));
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ovs_vport_receive(vport, skb, &tun_info);
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}
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static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
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{
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struct vxlan_port *vxlan_port = vxlan_vport(vport);
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__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
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if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
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return -EMSGSIZE;
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if (vxlan_port->exts) {
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struct nlattr *exts;
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exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
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if (!exts)
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return -EMSGSIZE;
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if (vxlan_port->exts & VXLAN_F_GBP &&
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nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
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return -EMSGSIZE;
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nla_nest_end(skb, exts);
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}
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return 0;
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}
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static void vxlan_tnl_destroy(struct vport *vport)
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{
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struct vxlan_port *vxlan_port = vxlan_vport(vport);
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vxlan_sock_release(vxlan_port->vs);
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ovs_vport_deferred_free(vport);
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}
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static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX+1] = {
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[OVS_VXLAN_EXT_GBP] = { .type = NLA_FLAG, },
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};
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static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr)
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{
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struct nlattr *exts[OVS_VXLAN_EXT_MAX+1];
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struct vxlan_port *vxlan_port;
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int err;
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if (nla_len(attr) < sizeof(struct nlattr))
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return -EINVAL;
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err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
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if (err < 0)
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return err;
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vxlan_port = vxlan_vport(vport);
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if (exts[OVS_VXLAN_EXT_GBP])
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vxlan_port->exts |= VXLAN_F_GBP;
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return 0;
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}
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static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
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{
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struct net *net = ovs_dp_get_net(parms->dp);
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struct nlattr *options = parms->options;
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struct vxlan_port *vxlan_port;
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struct vxlan_sock *vs;
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struct vport *vport;
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struct nlattr *a;
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u16 dst_port;
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int err;
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if (!options) {
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err = -EINVAL;
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goto error;
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}
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a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
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if (a && nla_len(a) == sizeof(u16)) {
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dst_port = nla_get_u16(a);
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} else {
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/* Require destination port from userspace. */
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err = -EINVAL;
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goto error;
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}
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vport = ovs_vport_alloc(sizeof(struct vxlan_port),
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&ovs_vxlan_vport_ops, parms);
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if (IS_ERR(vport))
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return vport;
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vxlan_port = vxlan_vport(vport);
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strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
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a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
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if (a) {
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err = vxlan_configure_exts(vport, a);
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if (err) {
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ovs_vport_free(vport);
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goto error;
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}
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}
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vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true,
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vxlan_port->exts);
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if (IS_ERR(vs)) {
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ovs_vport_free(vport);
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return (void *)vs;
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}
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vxlan_port->vs = vs;
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return vport;
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error:
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return ERR_PTR(err);
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}
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static int vxlan_ext_gbp(struct sk_buff *skb)
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{
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const struct ovs_tunnel_info *tun_info;
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const struct ovs_vxlan_opts *opts;
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tun_info = OVS_CB(skb)->egress_tun_info;
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opts = tun_info->options;
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if (tun_info->tunnel.tun_flags & TUNNEL_VXLAN_OPT &&
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tun_info->options_len >= sizeof(*opts))
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return opts->gbp;
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else
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return 0;
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}
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static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
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{
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struct net *net = ovs_dp_get_net(vport->dp);
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struct vxlan_port *vxlan_port = vxlan_vport(vport);
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__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
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const struct ovs_key_ipv4_tunnel *tun_key;
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struct vxlan_metadata md = {0};
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struct rtable *rt;
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struct flowi4 fl;
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__be16 src_port;
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__be16 df;
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int err;
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u32 vxflags;
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if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
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err = -EINVAL;
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goto error;
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}
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tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
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rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP);
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if (IS_ERR(rt)) {
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err = PTR_ERR(rt);
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goto error;
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}
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df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
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htons(IP_DF) : 0;
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skb->ignore_df = 1;
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src_port = udp_flow_src_port(net, skb, 0, 0, true);
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md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8);
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md.gbp = vxlan_ext_gbp(skb);
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vxflags = vxlan_port->exts |
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(tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0);
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err = vxlan_xmit_skb(rt, skb, fl.saddr, tun_key->ipv4_dst,
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tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
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src_port, dst_port,
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&md, false, vxflags);
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if (err < 0)
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ip_rt_put(rt);
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return err;
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error:
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kfree_skb(skb);
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return err;
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}
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static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
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struct ovs_tunnel_info *egress_tun_info)
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{
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struct net *net = ovs_dp_get_net(vport->dp);
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struct vxlan_port *vxlan_port = vxlan_vport(vport);
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__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
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__be16 src_port;
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int port_min;
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int port_max;
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inet_get_local_port_range(net, &port_min, &port_max);
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src_port = udp_flow_src_port(net, skb, 0, 0, true);
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return ovs_tunnel_get_egress_info(egress_tun_info, net,
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OVS_CB(skb)->egress_tun_info,
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IPPROTO_UDP, skb->mark,
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src_port, dst_port);
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}
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static const char *vxlan_get_name(const struct vport *vport)
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{
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struct vxlan_port *vxlan_port = vxlan_vport(vport);
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return vxlan_port->name;
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}
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static struct vport_ops ovs_vxlan_vport_ops = {
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.type = OVS_VPORT_TYPE_VXLAN,
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.create = vxlan_tnl_create,
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.destroy = vxlan_tnl_destroy,
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.get_name = vxlan_get_name,
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.get_options = vxlan_get_options,
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.send = vxlan_tnl_send,
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.get_egress_tun_info = vxlan_get_egress_tun_info,
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.owner = THIS_MODULE,
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};
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static int __init ovs_vxlan_tnl_init(void)
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{
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return ovs_vport_ops_register(&ovs_vxlan_vport_ops);
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}
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static void __exit ovs_vxlan_tnl_exit(void)
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{
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ovs_vport_ops_unregister(&ovs_vxlan_vport_ops);
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}
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module_init(ovs_vxlan_tnl_init);
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module_exit(ovs_vxlan_tnl_exit);
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MODULE_DESCRIPTION("OVS: VXLAN switching port");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("vport-type-4");
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