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10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/in.h>
13#include <linux/ip.h>
14#include <linux/net.h>
15#include <linux/rculist.h>
16#include <linux/udp.h>
17#include <linux/if_vlan.h>
18#include <linux/module.h>
19
20#include <net/geneve.h>
21#include <net/icmp.h>
22#include <net/ip.h>
23#include <net/route.h>
24#include <net/udp.h>
25#include <net/xfrm.h>
26
27#include "datapath.h"
28#include "vport.h"
29
30static struct vport_ops ovs_geneve_vport_ops;
31
32
33
34
35
36
37struct geneve_port {
38 struct geneve_sock *gs;
39 char name[IFNAMSIZ];
40};
41
42static LIST_HEAD(geneve_ports);
43
44static inline struct geneve_port *geneve_vport(const struct vport *vport)
45{
46 return vport_priv(vport);
47}
48
49static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
50{
51 return (struct genevehdr *)(udp_hdr(skb) + 1);
52}
53
54
55static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
56{
57#ifdef __BIG_ENDIAN
58 vni[0] = (__force __u8)(tun_id >> 16);
59 vni[1] = (__force __u8)(tun_id >> 8);
60 vni[2] = (__force __u8)tun_id;
61#else
62 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
63 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
64 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
65#endif
66}
67
68
69static __be64 vni_to_tunnel_id(const __u8 *vni)
70{
71#ifdef __BIG_ENDIAN
72 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
73#else
74 return (__force __be64)(((__force u64)vni[0] << 40) |
75 ((__force u64)vni[1] << 48) |
76 ((__force u64)vni[2] << 56));
77#endif
78}
79
80static void geneve_rcv(struct geneve_sock *gs, struct sk_buff *skb)
81{
82 struct vport *vport = gs->rcv_data;
83 struct genevehdr *geneveh = geneve_hdr(skb);
84 int opts_len;
85 struct ovs_tunnel_info tun_info;
86 __be64 key;
87 __be16 flags;
88
89 opts_len = geneveh->opt_len * 4;
90
91 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
92 (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0) |
93 (geneveh->oam ? TUNNEL_OAM : 0) |
94 (geneveh->critical ? TUNNEL_CRIT_OPT : 0);
95
96 key = vni_to_tunnel_id(geneveh->vni);
97
98 ovs_flow_tun_info_init(&tun_info, ip_hdr(skb),
99 udp_hdr(skb)->source, udp_hdr(skb)->dest,
100 key, flags,
101 geneveh->options, opts_len);
102
103 ovs_vport_receive(vport, skb, &tun_info);
104}
105
106static int geneve_get_options(const struct vport *vport,
107 struct sk_buff *skb)
108{
109 struct geneve_port *geneve_port = geneve_vport(vport);
110 struct inet_sock *sk = inet_sk(geneve_port->gs->sock->sk);
111
112 if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(sk->inet_sport)))
113 return -EMSGSIZE;
114 return 0;
115}
116
117static void geneve_tnl_destroy(struct vport *vport)
118{
119 struct geneve_port *geneve_port = geneve_vport(vport);
120
121 geneve_sock_release(geneve_port->gs);
122
123 ovs_vport_deferred_free(vport);
124}
125
126static struct vport *geneve_tnl_create(const struct vport_parms *parms)
127{
128 struct net *net = ovs_dp_get_net(parms->dp);
129 struct nlattr *options = parms->options;
130 struct geneve_port *geneve_port;
131 struct geneve_sock *gs;
132 struct vport *vport;
133 struct nlattr *a;
134 int err;
135 u16 dst_port;
136
137 if (!options) {
138 err = -EINVAL;
139 goto error;
140 }
141
142 a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
143 if (a && nla_len(a) == sizeof(u16)) {
144 dst_port = nla_get_u16(a);
145 } else {
146
147 err = -EINVAL;
148 goto error;
149 }
150
151 vport = ovs_vport_alloc(sizeof(struct geneve_port),
152 &ovs_geneve_vport_ops, parms);
153 if (IS_ERR(vport))
154 return vport;
155
156 geneve_port = geneve_vport(vport);
157 strncpy(geneve_port->name, parms->name, IFNAMSIZ);
158
159 gs = geneve_sock_add(net, htons(dst_port), geneve_rcv, vport, true, 0);
160 if (IS_ERR(gs)) {
161 ovs_vport_free(vport);
162 return (void *)gs;
163 }
164 geneve_port->gs = gs;
165
166 return vport;
167error:
168 return ERR_PTR(err);
169}
170
171static int geneve_tnl_send(struct vport *vport, struct sk_buff *skb)
172{
173 const struct ovs_key_ipv4_tunnel *tun_key;
174 struct ovs_tunnel_info *tun_info;
175 struct net *net = ovs_dp_get_net(vport->dp);
176 struct geneve_port *geneve_port = geneve_vport(vport);
177 __be16 dport = inet_sk(geneve_port->gs->sock->sk)->inet_sport;
178 __be16 sport;
179 struct rtable *rt;
180 struct flowi4 fl;
181 u8 vni[3], opts_len, *opts;
182 __be16 df;
183 int err;
184
185 tun_info = OVS_CB(skb)->egress_tun_info;
186 if (unlikely(!tun_info)) {
187 err = -EINVAL;
188 goto error;
189 }
190
191 tun_key = &tun_info->tunnel;
192 rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP);
193 if (IS_ERR(rt)) {
194 err = PTR_ERR(rt);
195 goto error;
196 }
197
198 df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
199 sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true);
200 tunnel_id_to_vni(tun_key->tun_id, vni);
201 skb->ignore_df = 1;
202
203 if (tun_key->tun_flags & TUNNEL_GENEVE_OPT) {
204 opts = (u8 *)tun_info->options;
205 opts_len = tun_info->options_len;
206 } else {
207 opts = NULL;
208 opts_len = 0;
209 }
210
211 err = geneve_xmit_skb(geneve_port->gs, rt, skb, fl.saddr,
212 tun_key->ipv4_dst, tun_key->ipv4_tos,
213 tun_key->ipv4_ttl, df, sport, dport,
214 tun_key->tun_flags, vni, opts_len, opts,
215 !!(tun_key->tun_flags & TUNNEL_CSUM), false);
216 if (err < 0)
217 ip_rt_put(rt);
218 return err;
219
220error:
221 kfree_skb(skb);
222 return err;
223}
224
225static const char *geneve_get_name(const struct vport *vport)
226{
227 struct geneve_port *geneve_port = geneve_vport(vport);
228
229 return geneve_port->name;
230}
231
232static int geneve_get_egress_tun_info(struct vport *vport, struct sk_buff *skb,
233 struct ovs_tunnel_info *egress_tun_info)
234{
235 struct geneve_port *geneve_port = geneve_vport(vport);
236 struct net *net = ovs_dp_get_net(vport->dp);
237 __be16 dport = inet_sk(geneve_port->gs->sock->sk)->inet_sport;
238 __be16 sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true);
239
240
241
242 return ovs_tunnel_get_egress_info(egress_tun_info,
243 ovs_dp_get_net(vport->dp),
244 OVS_CB(skb)->egress_tun_info,
245 IPPROTO_UDP, skb->mark, sport, dport);
246}
247
248static struct vport_ops ovs_geneve_vport_ops = {
249 .type = OVS_VPORT_TYPE_GENEVE,
250 .create = geneve_tnl_create,
251 .destroy = geneve_tnl_destroy,
252 .get_name = geneve_get_name,
253 .get_options = geneve_get_options,
254 .send = geneve_tnl_send,
255 .owner = THIS_MODULE,
256 .get_egress_tun_info = geneve_get_egress_tun_info,
257};
258
259static int __init ovs_geneve_tnl_init(void)
260{
261 return ovs_vport_ops_register(&ovs_geneve_vport_ops);
262}
263
264static void __exit ovs_geneve_tnl_exit(void)
265{
266 ovs_vport_ops_unregister(&ovs_geneve_vport_ops);
267}
268
269module_init(ovs_geneve_tnl_init);
270module_exit(ovs_geneve_tnl_exit);
271
272MODULE_DESCRIPTION("OVS: Geneve swiching port");
273MODULE_LICENSE("GPL");
274MODULE_ALIAS("vport-type-5");
275
