Commit | Line | Data |
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58264848 | 1 | /* |
8c8b1b83 | 2 | * Copyright (c) 2014 Nicira, Inc. |
58264848 PS |
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> | |
62b9c8d0 | 27 | #include <linux/module.h> |
58264848 PS |
28 | |
29 | #include <net/icmp.h> | |
30 | #include <net/ip.h> | |
31 | #include <net/udp.h> | |
32 | #include <net/ip_tunnels.h> | |
58264848 PS |
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" | |
1dd144cf | 43 | #include "vport-vxlan.h" |
58264848 PS |
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]; | |
1dd144cf | 53 | u32 exts; /* VXLAN_F_* in <net/vxlan.h> */ |
58264848 PS |
54 | }; |
55 | ||
62b9c8d0 TG |
56 | static struct vport_ops ovs_vxlan_vport_ops; |
57 | ||
58264848 PS |
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. */ | |
3511494c TG |
64 | static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb, |
65 | struct vxlan_metadata *md) | |
58264848 | 66 | { |
f0b128c1 | 67 | struct ovs_tunnel_info tun_info; |
1dd144cf | 68 | struct vxlan_port *vxlan_port; |
58264848 PS |
69 | struct vport *vport = vs->data; |
70 | struct iphdr *iph; | |
1dd144cf TG |
71 | struct ovs_vxlan_opts opts = { |
72 | .gbp = md->gbp, | |
73 | }; | |
58264848 | 74 | __be64 key; |
1dd144cf TG |
75 | __be16 flags; |
76 | ||
b8693877 | 77 | flags = TUNNEL_KEY | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0); |
1dd144cf | 78 | vxlan_port = vxlan_vport(vport); |
fd3137cd | 79 | if (vxlan_port->exts & VXLAN_F_GBP && md->gbp) |
1dd144cf | 80 | flags |= TUNNEL_VXLAN_OPT; |
58264848 PS |
81 | |
82 | /* Save outer tunnel values */ | |
83 | iph = ip_hdr(skb); | |
3511494c | 84 | key = cpu_to_be64(ntohl(md->vni) >> 8); |
8f0aad6f WZ |
85 | ovs_flow_tun_info_init(&tun_info, iph, |
86 | udp_hdr(skb)->source, udp_hdr(skb)->dest, | |
1dd144cf | 87 | key, flags, &opts, sizeof(opts)); |
58264848 | 88 | |
f0b128c1 | 89 | ovs_vport_receive(vport, skb, &tun_info); |
58264848 PS |
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; | |
1dd144cf TG |
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 | ||
58264848 PS |
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 | ||
1dd144cf TG |
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 | ||
58264848 PS |
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 | ||
1dd144cf TG |
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); | |
58264848 PS |
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 | ||
1dd144cf TG |
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 | ||
58264848 PS |
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); | |
79b16aad DM |
225 | struct sock *sk = vxlan_port->vs->sock->sk; |
226 | __be16 dst_port = inet_sk(sk)->inet_sport; | |
3f4c1d87 | 227 | const struct ovs_key_ipv4_tunnel *tun_key; |
3511494c | 228 | struct vxlan_metadata md = {0}; |
58264848 PS |
229 | struct rtable *rt; |
230 | struct flowi4 fl; | |
231 | __be16 src_port; | |
58264848 PS |
232 | __be16 df; |
233 | int err; | |
b8693877 | 234 | u32 vxflags; |
58264848 | 235 | |
f0b128c1 | 236 | if (unlikely(!OVS_CB(skb)->egress_tun_info)) { |
58264848 PS |
237 | err = -EINVAL; |
238 | goto error; | |
239 | } | |
240 | ||
f0b128c1 | 241 | tun_key = &OVS_CB(skb)->egress_tun_info->tunnel; |
3f4c1d87 | 242 | rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP); |
58264848 PS |
243 | if (IS_ERR(rt)) { |
244 | err = PTR_ERR(rt); | |
245 | goto error; | |
246 | } | |
247 | ||
8c8b1b83 | 248 | df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? |
58264848 PS |
249 | htons(IP_DF) : 0; |
250 | ||
60ff7467 | 251 | skb->ignore_df = 1; |
58264848 | 252 | |
535fb8d0 | 253 | src_port = udp_flow_src_port(net, skb, 0, 0, true); |
3511494c | 254 | md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8); |
1dd144cf | 255 | md.gbp = vxlan_ext_gbp(skb); |
b8693877 JG |
256 | vxflags = vxlan_port->exts | |
257 | (tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0); | |
58264848 | 258 | |
79b16aad | 259 | err = vxlan_xmit_skb(rt, sk, skb, fl.saddr, tun_key->ipv4_dst, |
8c8b1b83 | 260 | tun_key->ipv4_tos, tun_key->ipv4_ttl, df, |
58264848 | 261 | src_port, dst_port, |
b8693877 | 262 | &md, false, vxflags); |
58264848 PS |
263 | if (err < 0) |
264 | ip_rt_put(rt); | |
997e068e | 265 | return err; |
58264848 | 266 | error: |
997e068e | 267 | kfree_skb(skb); |
58264848 PS |
268 | return err; |
269 | } | |
270 | ||
8f0aad6f WZ |
271 | static int vxlan_get_egress_tun_info(struct vport *vport, struct sk_buff *skb, |
272 | struct ovs_tunnel_info *egress_tun_info) | |
273 | { | |
274 | struct net *net = ovs_dp_get_net(vport->dp); | |
275 | struct vxlan_port *vxlan_port = vxlan_vport(vport); | |
276 | __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport; | |
277 | __be16 src_port; | |
278 | int port_min; | |
279 | int port_max; | |
280 | ||
281 | inet_get_local_port_range(net, &port_min, &port_max); | |
282 | src_port = udp_flow_src_port(net, skb, 0, 0, true); | |
283 | ||
284 | return ovs_tunnel_get_egress_info(egress_tun_info, net, | |
285 | OVS_CB(skb)->egress_tun_info, | |
286 | IPPROTO_UDP, skb->mark, | |
287 | src_port, dst_port); | |
288 | } | |
289 | ||
58264848 PS |
290 | static const char *vxlan_get_name(const struct vport *vport) |
291 | { | |
292 | struct vxlan_port *vxlan_port = vxlan_vport(vport); | |
293 | return vxlan_port->name; | |
294 | } | |
295 | ||
62b9c8d0 | 296 | static struct vport_ops ovs_vxlan_vport_ops = { |
58264848 PS |
297 | .type = OVS_VPORT_TYPE_VXLAN, |
298 | .create = vxlan_tnl_create, | |
299 | .destroy = vxlan_tnl_destroy, | |
300 | .get_name = vxlan_get_name, | |
301 | .get_options = vxlan_get_options, | |
302 | .send = vxlan_tnl_send, | |
8f0aad6f | 303 | .get_egress_tun_info = vxlan_get_egress_tun_info, |
62b9c8d0 | 304 | .owner = THIS_MODULE, |
58264848 | 305 | }; |
62b9c8d0 TG |
306 | |
307 | static int __init ovs_vxlan_tnl_init(void) | |
308 | { | |
309 | return ovs_vport_ops_register(&ovs_vxlan_vport_ops); | |
310 | } | |
311 | ||
312 | static void __exit ovs_vxlan_tnl_exit(void) | |
313 | { | |
314 | ovs_vport_ops_unregister(&ovs_vxlan_vport_ops); | |
315 | } | |
316 | ||
317 | module_init(ovs_vxlan_tnl_init); | |
318 | module_exit(ovs_vxlan_tnl_exit); | |
319 | ||
320 | MODULE_DESCRIPTION("OVS: VXLAN switching port"); | |
321 | MODULE_LICENSE("GPL"); | |
322 | MODULE_ALIAS("vport-type-4"); |