~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/openvswitch/vport-vxlan.c

Version: ~ [ linux-5.5-rc1 ] ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Copyright (c) 2014 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 #include <linux/module.h>
 28 
 29 #include <net/icmp.h>
 30 #include <net/ip.h>
 31 #include <net/udp.h>
 32 #include <net/ip_tunnels.h>
 33 #include <net/rtnetlink.h>
 34 #include <net/route.h>
 35 #include <net/dsfield.h>
 36 #include <net/inet_ecn.h>
 37 #include <net/net_namespace.h>
 38 #include <net/netns/generic.h>
 39 #include <net/vxlan.h>
 40 
 41 #include "datapath.h"
 42 #include "vport.h"
 43 #include "vport-vxlan.h"
 44 
 45 /**
 46  * struct vxlan_port - Keeps track of open UDP ports
 47  * @vs: vxlan_sock created for the port.
 48  * @name: vport name.
 49  */
 50 struct vxlan_port {
 51         struct vxlan_sock *vs;
 52         char name[IFNAMSIZ];
 53         u32 exts; /* VXLAN_F_* in <net/vxlan.h> */
 54 };
 55 
 56 static struct vport_ops ovs_vxlan_vport_ops;
 57 
 58 static inline struct vxlan_port *vxlan_vport(const struct vport *vport)
 59 {
 60         return vport_priv(vport);
 61 }
 62 
 63 /* Called with rcu_read_lock and BH disabled. */
 64 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
 65                       struct vxlan_metadata *md)
 66 {
 67         struct ovs_tunnel_info tun_info;
 68         struct vxlan_port *vxlan_port;
 69         struct vport *vport = vs->data;
 70         struct iphdr *iph;
 71         struct ovs_vxlan_opts opts = {
 72                 .gbp = md->gbp,
 73         };
 74         __be64 key;
 75         __be16 flags;
 76 
 77         flags = TUNNEL_KEY | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0);
 78         vxlan_port = vxlan_vport(vport);
 79         if (vxlan_port->exts & VXLAN_F_GBP && md->gbp)
 80                 flags |= TUNNEL_VXLAN_OPT;
 81 
 82         /* Save outer tunnel values */
 83         iph = ip_hdr(skb);
 84         key = cpu_to_be64(ntohl(md->vni) >> 8);
 85         ovs_flow_tun_info_init(&tun_info, iph,
 86                                udp_hdr(skb)->source, udp_hdr(skb)->dest,
 87                                key, flags, &opts, sizeof(opts));
 88 
 89         ovs_vport_receive(vport, skb, &tun_info);
 90 }
 91 
 92 static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
 93 {
 94         struct vxlan_port *vxlan_port = vxlan_vport(vport);
 95         __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
 96 
 97         if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
 98                 return -EMSGSIZE;
 99 
100         if (vxlan_port->exts) {
101                 struct nlattr *exts;
102 
103                 exts = nla_nest_start(skb, OVS_TUNNEL_ATTR_EXTENSION);
104                 if (!exts)
105                         return -EMSGSIZE;
106 
107                 if (vxlan_port->exts & VXLAN_F_GBP &&
108                     nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
109                         return -EMSGSIZE;
110 
111                 nla_nest_end(skb, exts);
112         }
113 
114         return 0;
115 }
116 
117 static void vxlan_tnl_destroy(struct vport *vport)
118 {
119         struct vxlan_port *vxlan_port = vxlan_vport(vport);
120 
121         vxlan_sock_release(vxlan_port->vs);
122 
123         ovs_vport_deferred_free(vport);
124 }
125 
126 static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX+1] = {
127         [OVS_VXLAN_EXT_GBP]     = { .type = NLA_FLAG, },
128 };
129 
130 static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr)
131 {
132         struct nlattr *exts[OVS_VXLAN_EXT_MAX+1];
133         struct vxlan_port *vxlan_port;
134         int err;
135 
136         if (nla_len(attr) < sizeof(struct nlattr))
137                 return -EINVAL;
138 
139         err = nla_parse_nested(exts, OVS_VXLAN_EXT_MAX, attr, exts_policy);
140         if (err < 0)
141                 return err;
142 
143         vxlan_port = vxlan_vport(vport);
144 
145         if (exts[OVS_VXLAN_EXT_GBP])
146                 vxlan_port->exts |= VXLAN_F_GBP;
147 
148         return 0;
149 }
150 
151 static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
152 {
153         struct net *net = ovs_dp_get_net(parms->dp);
154         struct nlattr *options = parms->options;
155         struct vxlan_port *vxlan_port;
156         struct vxlan_sock *vs;
157         struct vport *vport;
158         struct nlattr *a;
159         u16 dst_port;
160         int err;
161 
162         if (!options) {
163                 err = -EINVAL;
164                 goto error;
165         }
166         a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
167         if (a && nla_len(a) == sizeof(u16)) {
168                 dst_port = nla_get_u16(a);
169         } else {
170                 /* Require destination port from userspace. */
171                 err = -EINVAL;
172                 goto error;
173         }
174 
175         vport = ovs_vport_alloc(sizeof(struct vxlan_port),
176                                 &ovs_vxlan_vport_ops, parms);
177         if (IS_ERR(vport))
178                 return vport;
179 
180         vxlan_port = vxlan_vport(vport);
181         strncpy(vxlan_port->name, parms->name, IFNAMSIZ);
182 
183         a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
184         if (a) {
185                 err = vxlan_configure_exts(vport, a);
186                 if (err) {
187                         ovs_vport_free(vport);
188                         goto error;
189                 }
190         }
191 
192         vs = vxlan_sock_add(net, htons(dst_port), vxlan_rcv, vport, true,
193                             vxlan_port->exts);
194         if (IS_ERR(vs)) {
195                 ovs_vport_free(vport);
196                 return (void *)vs;
197         }
198         vxlan_port->vs = vs;
199 
200         return vport;
201 
202 error:
203         return ERR_PTR(err);
204 }
205 
206 static int vxlan_ext_gbp(struct sk_buff *skb)
207 {
208         const struct ovs_tunnel_info *tun_info;
209         const struct ovs_vxlan_opts *opts;
210 
211         tun_info = OVS_CB(skb)->egress_tun_info;
212         opts = tun_info->options;
213 
214         if (tun_info->tunnel.tun_flags & TUNNEL_VXLAN_OPT &&
215             tun_info->options_len >= sizeof(*opts))
216                 return opts->gbp;
217         else
218                 return 0;
219 }
220 
221 static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
222 {
223         struct net *net = ovs_dp_get_net(vport->dp);
224         struct vxlan_port *vxlan_port = vxlan_vport(vport);
225         __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
226         const struct ovs_key_ipv4_tunnel *tun_key;
227         struct vxlan_metadata md = {0};
228         struct rtable *rt;
229         struct flowi4 fl;
230         __be16 src_port;
231         __be16 df;
232         int err;
233         u32 vxflags;
234 
235         if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
236                 err = -EINVAL;
237                 goto error;
238         }
239 
240         tun_key = &OVS_CB(skb)->egress_tun_info->tunnel;
241         rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP);
242         if (IS_ERR(rt)) {
243                 err = PTR_ERR(rt);
244                 goto error;
245         }
246 
247         df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
248                 htons(IP_DF) : 0;
249 
250         skb->ignore_df = 1;
251 
252         src_port = udp_flow_src_port(net, skb, 0, 0, true);
253         md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8);
254         md.gbp = vxlan_ext_gbp(skb);
255         vxflags = vxlan_port->exts |
256                       (tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0);
257 
258         err = vxlan_xmit_skb(rt, skb, fl.saddr, tun_key->ipv4_dst,
259                              tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
260                              src_port, dst_port,
261                              &md, false, vxflags);
262         if (err < 0)
263                 ip_rt_put(rt);
264         return err;
265 error:
266         kfree_skb(skb);
267         return err;
268 }
269 
270 static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
271                                      struct ovs_tunnel_info *egress_tun_info)
272 {
273         struct net *net = ovs_dp_get_net(vport->dp);
274         struct vxlan_port *vxlan_port = vxlan_vport(vport);
275         __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
276         __be16 src_port;
277         int port_min;
278         int port_max;
279 
280         inet_get_local_port_range(net, &port_min, &port_max);
281         src_port = udp_flow_src_port(net, skb, 0, 0, true);
282 
283         return ovs_tunnel_get_egress_info(egress_tun_info, net,
284                                           OVS_CB(skb)->egress_tun_info,
285                                           IPPROTO_UDP, skb->mark,
286                                           src_port, dst_port);
287 }
288 
289 static const char *vxlan_get_name(const struct vport *vport)
290 {
291         struct vxlan_port *vxlan_port = vxlan_vport(vport);
292         return vxlan_port->name;
293 }
294 
295 static struct vport_ops ovs_vxlan_vport_ops = {
296         .type           = OVS_VPORT_TYPE_VXLAN,
297         .create         = vxlan_tnl_create,
298         .destroy        = vxlan_tnl_destroy,
299         .get_name       = vxlan_get_name,
300         .get_options    = vxlan_get_options,
301         .send           = vxlan_tnl_send,
302         .get_egress_tun_info    = vxlan_get_egress_tun_info,
303         .owner          = THIS_MODULE,
304 };
305 
306 static int __init ovs_vxlan_tnl_init(void)
307 {
308         return ovs_vport_ops_register(&ovs_vxlan_vport_ops);
309 }
310 
311 static void __exit ovs_vxlan_tnl_exit(void)
312 {
313         ovs_vport_ops_unregister(&ovs_vxlan_vport_ops);
314 }
315 
316 module_init(ovs_vxlan_tnl_init);
317 module_exit(ovs_vxlan_tnl_exit);
318 
319 MODULE_DESCRIPTION("OVS: VXLAN switching port");
320 MODULE_LICENSE("GPL");
321 MODULE_ALIAS("vport-type-4");
322 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp