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aa310701 | 1 | /* |
8c8b1b83 | 2 | * Copyright (c) 2007-2014 Nicira, Inc. |
aa310701 PS |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
aa310701 PS |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
21 | #include <linux/if.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/ip.h> | |
24 | #include <linux/if_tunnel.h> | |
25 | #include <linux/if_vlan.h> | |
26 | #include <linux/in.h> | |
aa310701 PS |
27 | #include <linux/in_route.h> |
28 | #include <linux/inetdevice.h> | |
29 | #include <linux/jhash.h> | |
30 | #include <linux/list.h> | |
31 | #include <linux/kernel.h> | |
62b9c8d0 | 32 | #include <linux/module.h> |
aa310701 PS |
33 | #include <linux/workqueue.h> |
34 | #include <linux/rculist.h> | |
35 | #include <net/route.h> | |
36 | #include <net/xfrm.h> | |
37 | ||
38 | #include <net/icmp.h> | |
39 | #include <net/ip.h> | |
40 | #include <net/ip_tunnels.h> | |
41 | #include <net/gre.h> | |
42 | #include <net/net_namespace.h> | |
43 | #include <net/netns/generic.h> | |
44 | #include <net/protocol.h> | |
45 | ||
46 | #include "datapath.h" | |
47 | #include "vport.h" | |
48 | ||
62b9c8d0 TG |
49 | static struct vport_ops ovs_gre_vport_ops; |
50 | ||
aa310701 PS |
51 | /* Returns the least-significant 32 bits of a __be64. */ |
52 | static __be32 be64_get_low32(__be64 x) | |
53 | { | |
54 | #ifdef __BIG_ENDIAN | |
55 | return (__force __be32)x; | |
56 | #else | |
57 | return (__force __be32)((__force u64)x >> 32); | |
58 | #endif | |
59 | } | |
60 | ||
61 | static __be16 filter_tnl_flags(__be16 flags) | |
62 | { | |
63 | return flags & (TUNNEL_CSUM | TUNNEL_KEY); | |
64 | } | |
65 | ||
66 | static struct sk_buff *__build_header(struct sk_buff *skb, | |
67 | int tunnel_hlen) | |
68 | { | |
aa310701 | 69 | struct tnl_ptk_info tpi; |
f0b128c1 JG |
70 | const struct ovs_key_ipv4_tunnel *tun_key; |
71 | ||
72 | tun_key = &OVS_CB(skb)->egress_tun_info->tunnel; | |
aa310701 PS |
73 | |
74 | skb = gre_handle_offloads(skb, !!(tun_key->tun_flags & TUNNEL_CSUM)); | |
75 | if (IS_ERR(skb)) | |
997e068e | 76 | return skb; |
aa310701 PS |
77 | |
78 | tpi.flags = filter_tnl_flags(tun_key->tun_flags); | |
79 | tpi.proto = htons(ETH_P_TEB); | |
80 | tpi.key = be64_get_low32(tun_key->tun_id); | |
81 | tpi.seq = 0; | |
82 | gre_build_header(skb, &tpi, tunnel_hlen); | |
83 | ||
84 | return skb; | |
85 | } | |
86 | ||
87 | static __be64 key_to_tunnel_id(__be32 key, __be32 seq) | |
88 | { | |
89 | #ifdef __BIG_ENDIAN | |
90 | return (__force __be64)((__force u64)seq << 32 | (__force u32)key); | |
91 | #else | |
92 | return (__force __be64)((__force u64)key << 32 | (__force u32)seq); | |
93 | #endif | |
94 | } | |
95 | ||
96 | /* Called with rcu_read_lock and BH disabled. */ | |
97 | static int gre_rcv(struct sk_buff *skb, | |
98 | const struct tnl_ptk_info *tpi) | |
99 | { | |
f0b128c1 | 100 | struct ovs_tunnel_info tun_info; |
aa310701 PS |
101 | struct ovs_net *ovs_net; |
102 | struct vport *vport; | |
103 | __be64 key; | |
104 | ||
105 | ovs_net = net_generic(dev_net(skb->dev), ovs_net_id); | |
106 | vport = rcu_dereference(ovs_net->vport_net.gre_vport); | |
107 | if (unlikely(!vport)) | |
108 | return PACKET_REJECT; | |
109 | ||
110 | key = key_to_tunnel_id(tpi->key, tpi->seq); | |
8f0aad6f | 111 | ovs_flow_tun_info_init(&tun_info, ip_hdr(skb), 0, 0, key, |
f5796684 | 112 | filter_tnl_flags(tpi->flags), NULL, 0); |
aa310701 | 113 | |
f0b128c1 | 114 | ovs_vport_receive(vport, skb, &tun_info); |
aa310701 PS |
115 | return PACKET_RCVD; |
116 | } | |
117 | ||
e0bb8c44 WZ |
118 | /* Called with rcu_read_lock and BH disabled. */ |
119 | static int gre_err(struct sk_buff *skb, u32 info, | |
120 | const struct tnl_ptk_info *tpi) | |
121 | { | |
122 | struct ovs_net *ovs_net; | |
123 | struct vport *vport; | |
124 | ||
125 | ovs_net = net_generic(dev_net(skb->dev), ovs_net_id); | |
126 | vport = rcu_dereference(ovs_net->vport_net.gre_vport); | |
127 | ||
128 | if (unlikely(!vport)) | |
129 | return PACKET_REJECT; | |
130 | else | |
131 | return PACKET_RCVD; | |
132 | } | |
133 | ||
aa310701 PS |
134 | static int gre_tnl_send(struct vport *vport, struct sk_buff *skb) |
135 | { | |
136 | struct net *net = ovs_dp_get_net(vport->dp); | |
3f4c1d87 | 137 | const struct ovs_key_ipv4_tunnel *tun_key; |
aa310701 PS |
138 | struct flowi4 fl; |
139 | struct rtable *rt; | |
140 | int min_headroom; | |
141 | int tunnel_hlen; | |
142 | __be16 df; | |
143 | int err; | |
144 | ||
f0b128c1 | 145 | if (unlikely(!OVS_CB(skb)->egress_tun_info)) { |
aa310701 | 146 | err = -EINVAL; |
997e068e | 147 | goto err_free_skb; |
aa310701 PS |
148 | } |
149 | ||
f0b128c1 | 150 | tun_key = &OVS_CB(skb)->egress_tun_info->tunnel; |
3f4c1d87 | 151 | rt = ovs_tunnel_route_lookup(net, tun_key, skb->mark, &fl, IPPROTO_GRE); |
997e068e PS |
152 | if (IS_ERR(rt)) { |
153 | err = PTR_ERR(rt); | |
154 | goto err_free_skb; | |
155 | } | |
aa310701 | 156 | |
8c8b1b83 | 157 | tunnel_hlen = ip_gre_calc_hlen(tun_key->tun_flags); |
aa310701 PS |
158 | |
159 | min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len | |
160 | + tunnel_hlen + sizeof(struct iphdr) | |
df8a39de | 161 | + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0); |
aa310701 PS |
162 | if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) { |
163 | int head_delta = SKB_DATA_ALIGN(min_headroom - | |
164 | skb_headroom(skb) + | |
165 | 16); | |
166 | err = pskb_expand_head(skb, max_t(int, head_delta, 0), | |
167 | 0, GFP_ATOMIC); | |
168 | if (unlikely(err)) | |
169 | goto err_free_rt; | |
170 | } | |
171 | ||
5968250c JP |
172 | skb = vlan_hwaccel_push_inside(skb); |
173 | if (unlikely(!skb)) { | |
174 | err = -ENOMEM; | |
175 | goto err_free_rt; | |
aa310701 PS |
176 | } |
177 | ||
178 | /* Push Tunnel header. */ | |
179 | skb = __build_header(skb, tunnel_hlen); | |
997e068e | 180 | if (IS_ERR(skb)) { |
4aa61188 | 181 | err = PTR_ERR(skb); |
997e068e | 182 | skb = NULL; |
aa310701 PS |
183 | goto err_free_rt; |
184 | } | |
185 | ||
8c8b1b83 | 186 | df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ? |
aa310701 PS |
187 | htons(IP_DF) : 0; |
188 | ||
60ff7467 | 189 | skb->ignore_df = 1; |
aa310701 | 190 | |
aad88724 | 191 | return iptunnel_xmit(skb->sk, rt, skb, fl.saddr, |
8c8b1b83 PS |
192 | tun_key->ipv4_dst, IPPROTO_GRE, |
193 | tun_key->ipv4_tos, tun_key->ipv4_ttl, df, false); | |
aa310701 PS |
194 | err_free_rt: |
195 | ip_rt_put(rt); | |
997e068e PS |
196 | err_free_skb: |
197 | kfree_skb(skb); | |
aa310701 PS |
198 | return err; |
199 | } | |
200 | ||
201 | static struct gre_cisco_protocol gre_protocol = { | |
202 | .handler = gre_rcv, | |
e0bb8c44 | 203 | .err_handler = gre_err, |
aa310701 PS |
204 | .priority = 1, |
205 | }; | |
206 | ||
207 | static int gre_ports; | |
208 | static int gre_init(void) | |
209 | { | |
210 | int err; | |
211 | ||
212 | gre_ports++; | |
213 | if (gre_ports > 1) | |
214 | return 0; | |
215 | ||
216 | err = gre_cisco_register(&gre_protocol); | |
217 | if (err) | |
218 | pr_warn("cannot register gre protocol handler\n"); | |
219 | ||
220 | return err; | |
221 | } | |
222 | ||
223 | static void gre_exit(void) | |
224 | { | |
225 | gre_ports--; | |
226 | if (gre_ports > 0) | |
227 | return; | |
228 | ||
229 | gre_cisco_unregister(&gre_protocol); | |
230 | } | |
231 | ||
232 | static const char *gre_get_name(const struct vport *vport) | |
233 | { | |
234 | return vport_priv(vport); | |
235 | } | |
236 | ||
237 | static struct vport *gre_create(const struct vport_parms *parms) | |
238 | { | |
239 | struct net *net = ovs_dp_get_net(parms->dp); | |
240 | struct ovs_net *ovs_net; | |
241 | struct vport *vport; | |
242 | int err; | |
243 | ||
244 | err = gre_init(); | |
245 | if (err) | |
246 | return ERR_PTR(err); | |
247 | ||
248 | ovs_net = net_generic(net, ovs_net_id); | |
249 | if (ovsl_dereference(ovs_net->vport_net.gre_vport)) { | |
250 | vport = ERR_PTR(-EEXIST); | |
251 | goto error; | |
252 | } | |
253 | ||
254 | vport = ovs_vport_alloc(IFNAMSIZ, &ovs_gre_vport_ops, parms); | |
255 | if (IS_ERR(vport)) | |
256 | goto error; | |
257 | ||
258 | strncpy(vport_priv(vport), parms->name, IFNAMSIZ); | |
259 | rcu_assign_pointer(ovs_net->vport_net.gre_vport, vport); | |
260 | return vport; | |
261 | ||
262 | error: | |
263 | gre_exit(); | |
264 | return vport; | |
265 | } | |
266 | ||
267 | static void gre_tnl_destroy(struct vport *vport) | |
268 | { | |
269 | struct net *net = ovs_dp_get_net(vport->dp); | |
270 | struct ovs_net *ovs_net; | |
271 | ||
272 | ovs_net = net_generic(net, ovs_net_id); | |
273 | ||
944df8ae | 274 | RCU_INIT_POINTER(ovs_net->vport_net.gre_vport, NULL); |
aa310701 PS |
275 | ovs_vport_deferred_free(vport); |
276 | gre_exit(); | |
277 | } | |
278 | ||
8f0aad6f WZ |
279 | static int gre_get_egress_tun_info(struct vport *vport, struct sk_buff *skb, |
280 | struct ovs_tunnel_info *egress_tun_info) | |
281 | { | |
282 | return ovs_tunnel_get_egress_info(egress_tun_info, | |
283 | ovs_dp_get_net(vport->dp), | |
284 | OVS_CB(skb)->egress_tun_info, | |
285 | IPPROTO_GRE, skb->mark, 0, 0); | |
286 | } | |
287 | ||
62b9c8d0 | 288 | static struct vport_ops ovs_gre_vport_ops = { |
aa310701 PS |
289 | .type = OVS_VPORT_TYPE_GRE, |
290 | .create = gre_create, | |
291 | .destroy = gre_tnl_destroy, | |
292 | .get_name = gre_get_name, | |
293 | .send = gre_tnl_send, | |
8f0aad6f | 294 | .get_egress_tun_info = gre_get_egress_tun_info, |
62b9c8d0 | 295 | .owner = THIS_MODULE, |
aa310701 | 296 | }; |
62b9c8d0 TG |
297 | |
298 | static int __init ovs_gre_tnl_init(void) | |
299 | { | |
300 | return ovs_vport_ops_register(&ovs_gre_vport_ops); | |
301 | } | |
302 | ||
303 | static void __exit ovs_gre_tnl_exit(void) | |
304 | { | |
305 | ovs_vport_ops_unregister(&ovs_gre_vport_ops); | |
306 | } | |
307 | ||
308 | module_init(ovs_gre_tnl_init); | |
309 | module_exit(ovs_gre_tnl_exit); | |
310 | ||
311 | MODULE_DESCRIPTION("OVS: GRE switching port"); | |
312 | MODULE_LICENSE("GPL"); | |
313 | MODULE_ALIAS("vport-type-3"); |