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f5796684 JG |
1 | /* |
2 | * Copyright (c) 2014 Nicira, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
11 | ||
f5796684 JG |
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> | |
62b9c8d0 | 18 | #include <linux/module.h> |
f5796684 JG |
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 | ||
62b9c8d0 TG |
30 | static struct vport_ops ovs_geneve_vport_ops; |
31 | ||
f5796684 JG |
32 | /** |
33 | * struct geneve_port - Keeps track of open UDP ports | |
7e78cc46 | 34 | * @gs: The socket created for this port number. |
f5796684 JG |
35 | * @name: vport name. |
36 | */ | |
37 | struct geneve_port { | |
38 | struct geneve_sock *gs; | |
39 | char name[IFNAMSIZ]; | |
40 | }; | |
41 | ||
42 | static LIST_HEAD(geneve_ports); | |
43 | ||
44 | static inline struct geneve_port *geneve_vport(const struct vport *vport) | |
45 | { | |
46 | return vport_priv(vport); | |
47 | } | |
48 | ||
f5796684 JG |
49 | /* Convert 64 bit tunnel ID to 24 bit VNI. */ |
50 | static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) | |
51 | { | |
52 | #ifdef __BIG_ENDIAN | |
53 | vni[0] = (__force __u8)(tun_id >> 16); | |
54 | vni[1] = (__force __u8)(tun_id >> 8); | |
55 | vni[2] = (__force __u8)tun_id; | |
56 | #else | |
57 | vni[0] = (__force __u8)((__force u64)tun_id >> 40); | |
58 | vni[1] = (__force __u8)((__force u64)tun_id >> 48); | |
59 | vni[2] = (__force __u8)((__force u64)tun_id >> 56); | |
60 | #endif | |
61 | } | |
62 | ||
63 | /* Convert 24 bit VNI to 64 bit tunnel ID. */ | |
12eb18f7 | 64 | static __be64 vni_to_tunnel_id(const __u8 *vni) |
f5796684 JG |
65 | { |
66 | #ifdef __BIG_ENDIAN | |
67 | return (vni[0] << 16) | (vni[1] << 8) | vni[2]; | |
68 | #else | |
69 | return (__force __be64)(((__force u64)vni[0] << 40) | | |
70 | ((__force u64)vni[1] << 48) | | |
71 | ((__force u64)vni[2] << 56)); | |
72 | #endif | |
73 | } | |
74 | ||
75 | static void geneve_rcv(struct geneve_sock *gs, struct sk_buff *skb) | |
76 | { | |
77 | struct vport *vport = gs->rcv_data; | |
78 | struct genevehdr *geneveh = geneve_hdr(skb); | |
79 | int opts_len; | |
1d8fff90 | 80 | struct ip_tunnel_info tun_info; |
f5796684 JG |
81 | __be64 key; |
82 | __be16 flags; | |
83 | ||
84 | opts_len = geneveh->opt_len * 4; | |
85 | ||
1dd144cf | 86 | flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | |
f5796684 JG |
87 | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0) | |
88 | (geneveh->oam ? TUNNEL_OAM : 0) | | |
89 | (geneveh->critical ? TUNNEL_CRIT_OPT : 0); | |
90 | ||
91 | key = vni_to_tunnel_id(geneveh->vni); | |
92 | ||
1d8fff90 TG |
93 | ip_tunnel_info_init(&tun_info, ip_hdr(skb), |
94 | udp_hdr(skb)->source, udp_hdr(skb)->dest, | |
95 | key, flags, geneveh->options, opts_len); | |
f5796684 JG |
96 | |
97 | ovs_vport_receive(vport, skb, &tun_info); | |
98 | } | |
99 | ||
100 | static int geneve_get_options(const struct vport *vport, | |
101 | struct sk_buff *skb) | |
102 | { | |
103 | struct geneve_port *geneve_port = geneve_vport(vport); | |
0a5d1c55 | 104 | struct inet_sock *sk = inet_sk(geneve_port->gs->sock->sk); |
f5796684 | 105 | |
0a5d1c55 | 106 | if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(sk->inet_sport))) |
f5796684 JG |
107 | return -EMSGSIZE; |
108 | return 0; | |
109 | } | |
110 | ||
111 | static void geneve_tnl_destroy(struct vport *vport) | |
112 | { | |
113 | struct geneve_port *geneve_port = geneve_vport(vport); | |
114 | ||
115 | geneve_sock_release(geneve_port->gs); | |
116 | ||
117 | ovs_vport_deferred_free(vport); | |
118 | } | |
119 | ||
120 | static struct vport *geneve_tnl_create(const struct vport_parms *parms) | |
121 | { | |
122 | struct net *net = ovs_dp_get_net(parms->dp); | |
123 | struct nlattr *options = parms->options; | |
124 | struct geneve_port *geneve_port; | |
125 | struct geneve_sock *gs; | |
126 | struct vport *vport; | |
127 | struct nlattr *a; | |
128 | int err; | |
129 | u16 dst_port; | |
130 | ||
131 | if (!options) { | |
132 | err = -EINVAL; | |
133 | goto error; | |
134 | } | |
135 | ||
136 | a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT); | |
137 | if (a && nla_len(a) == sizeof(u16)) { | |
138 | dst_port = nla_get_u16(a); | |
139 | } else { | |
140 | /* Require destination port from userspace. */ | |
141 | err = -EINVAL; | |
142 | goto error; | |
143 | } | |
144 | ||
145 | vport = ovs_vport_alloc(sizeof(struct geneve_port), | |
146 | &ovs_geneve_vport_ops, parms); | |
147 | if (IS_ERR(vport)) | |
148 | return vport; | |
149 | ||
150 | geneve_port = geneve_vport(vport); | |
151 | strncpy(geneve_port->name, parms->name, IFNAMSIZ); | |
152 | ||
153 | gs = geneve_sock_add(net, htons(dst_port), geneve_rcv, vport, true, 0); | |
154 | if (IS_ERR(gs)) { | |
155 | ovs_vport_free(vport); | |
156 | return (void *)gs; | |
157 | } | |
158 | geneve_port->gs = gs; | |
159 | ||
160 | return vport; | |
161 | error: | |
162 | return ERR_PTR(err); | |
163 | } | |
164 | ||
165 | static int geneve_tnl_send(struct vport *vport, struct sk_buff *skb) | |
166 | { | |
1d8fff90 TG |
167 | const struct ip_tunnel_key *tun_key; |
168 | struct ip_tunnel_info *tun_info; | |
f5796684 JG |
169 | struct net *net = ovs_dp_get_net(vport->dp); |
170 | struct geneve_port *geneve_port = geneve_vport(vport); | |
171 | __be16 dport = inet_sk(geneve_port->gs->sock->sk)->inet_sport; | |
172 | __be16 sport; | |
173 | struct rtable *rt; | |
174 | struct flowi4 fl; | |
1dd144cf | 175 | u8 vni[3], opts_len, *opts; |
f5796684 JG |
176 | __be16 df; |
177 | int err; | |
178 | ||
179 | tun_info = OVS_CB(skb)->egress_tun_info; | |
180 | if (unlikely(!tun_info)) { | |
181 | err = -EINVAL; | |
182 | goto error; | |
183 | } | |
184 | ||
1d8fff90 | 185 | tun_key = &tun_info->key; |
3f4c1d87 | 186 | rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_UDP); |
f5796684 JG |
187 | if (IS_ERR(rt)) { |
188 | err = PTR_ERR(rt); | |
189 | goto error; | |
190 | } | |
191 | ||
192 | df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; | |
193 | sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true); | |
194 | tunnel_id_to_vni(tun_key->tun_id, vni); | |
195 | skb->ignore_df = 1; | |
196 | ||
1dd144cf TG |
197 | if (tun_key->tun_flags & TUNNEL_GENEVE_OPT) { |
198 | opts = (u8 *)tun_info->options; | |
199 | opts_len = tun_info->options_len; | |
200 | } else { | |
201 | opts = NULL; | |
202 | opts_len = 0; | |
203 | } | |
204 | ||
f5796684 | 205 | err = geneve_xmit_skb(geneve_port->gs, rt, skb, fl.saddr, |
7c383fb2 JB |
206 | tun_key->u.ipv4.dst, tun_key->tos, |
207 | tun_key->ttl, df, sport, dport, | |
1dd144cf | 208 | tun_key->tun_flags, vni, opts_len, opts, |
b8693877 | 209 | !!(tun_key->tun_flags & TUNNEL_CSUM), false); |
f5796684 JG |
210 | if (err < 0) |
211 | ip_rt_put(rt); | |
997e068e PS |
212 | return err; |
213 | ||
f5796684 | 214 | error: |
997e068e | 215 | kfree_skb(skb); |
f5796684 JG |
216 | return err; |
217 | } | |
218 | ||
219 | static const char *geneve_get_name(const struct vport *vport) | |
220 | { | |
221 | struct geneve_port *geneve_port = geneve_vport(vport); | |
222 | ||
223 | return geneve_port->name; | |
224 | } | |
225 | ||
8f0aad6f | 226 | static int geneve_get_egress_tun_info(struct vport *vport, struct sk_buff *skb, |
1d8fff90 | 227 | struct ip_tunnel_info *egress_tun_info) |
8f0aad6f WZ |
228 | { |
229 | struct geneve_port *geneve_port = geneve_vport(vport); | |
230 | struct net *net = ovs_dp_get_net(vport->dp); | |
231 | __be16 dport = inet_sk(geneve_port->gs->sock->sk)->inet_sport; | |
232 | __be16 sport = udp_flow_src_port(net, skb, 1, USHRT_MAX, true); | |
233 | ||
234 | /* Get tp_src and tp_dst, refert to geneve_build_header(). | |
235 | */ | |
236 | return ovs_tunnel_get_egress_info(egress_tun_info, | |
237 | ovs_dp_get_net(vport->dp), | |
238 | OVS_CB(skb)->egress_tun_info, | |
239 | IPPROTO_UDP, skb->mark, sport, dport); | |
240 | } | |
241 | ||
62b9c8d0 | 242 | static struct vport_ops ovs_geneve_vport_ops = { |
f5796684 JG |
243 | .type = OVS_VPORT_TYPE_GENEVE, |
244 | .create = geneve_tnl_create, | |
245 | .destroy = geneve_tnl_destroy, | |
246 | .get_name = geneve_get_name, | |
247 | .get_options = geneve_get_options, | |
248 | .send = geneve_tnl_send, | |
62b9c8d0 | 249 | .owner = THIS_MODULE, |
8f0aad6f | 250 | .get_egress_tun_info = geneve_get_egress_tun_info, |
f5796684 | 251 | }; |
62b9c8d0 TG |
252 | |
253 | static int __init ovs_geneve_tnl_init(void) | |
254 | { | |
255 | return ovs_vport_ops_register(&ovs_geneve_vport_ops); | |
256 | } | |
257 | ||
258 | static void __exit ovs_geneve_tnl_exit(void) | |
259 | { | |
260 | ovs_vport_ops_unregister(&ovs_geneve_vport_ops); | |
261 | } | |
262 | ||
263 | module_init(ovs_geneve_tnl_init); | |
264 | module_exit(ovs_geneve_tnl_exit); | |
265 | ||
266 | MODULE_DESCRIPTION("OVS: Geneve swiching port"); | |
267 | MODULE_LICENSE("GPL"); | |
268 | MODULE_ALIAS("vport-type-5"); |