Commit | Line | Data |
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21f42cc9 SK |
1 | /* |
2 | * xfrm_device.c - IPsec device offloading code. | |
3 | * | |
4 | * Copyright (c) 2015 secunet Security Networks AG | |
5 | * | |
6 | * Author: | |
7 | * Steffen Klassert <steffen.klassert@secunet.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/errno.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <net/dst.h> | |
22 | #include <net/xfrm.h> | |
23 | #include <linux/notifier.h> | |
24 | ||
b81f884a | 25 | #ifdef CONFIG_XFRM_OFFLOAD |
f6e27114 SK |
26 | int validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features) |
27 | { | |
28 | int err; | |
29 | struct xfrm_state *x; | |
30 | struct xfrm_offload *xo = xfrm_offload(skb); | |
31 | ||
32 | if (skb_is_gso(skb)) | |
33 | return 0; | |
34 | ||
35 | if (xo) { | |
36 | x = skb->sp->xvec[skb->sp->len - 1]; | |
37 | if (xo->flags & XFRM_GRO || x->xso.flags & XFRM_OFFLOAD_INBOUND) | |
38 | return 0; | |
39 | ||
40 | x->outer_mode->xmit(x, skb); | |
41 | ||
42 | err = x->type_offload->xmit(x, skb, features); | |
43 | if (err) { | |
44 | XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); | |
45 | return err; | |
46 | } | |
47 | ||
48 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
49 | } | |
50 | ||
51 | return 0; | |
52 | } | |
53 | EXPORT_SYMBOL_GPL(validate_xmit_xfrm); | |
54 | ||
d77e38e6 SK |
55 | int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, |
56 | struct xfrm_user_offload *xuo) | |
57 | { | |
58 | int err; | |
59 | struct dst_entry *dst; | |
60 | struct net_device *dev; | |
61 | struct xfrm_state_offload *xso = &x->xso; | |
62 | xfrm_address_t *saddr; | |
63 | xfrm_address_t *daddr; | |
64 | ||
65 | if (!x->type_offload) | |
66 | return 0; | |
67 | ||
68 | /* We don't yet support UDP encapsulation, TFC padding and ESN. */ | |
69 | if (x->encap || x->tfcpad || (x->props.flags & XFRM_STATE_ESN)) | |
70 | return 0; | |
71 | ||
72 | dev = dev_get_by_index(net, xuo->ifindex); | |
73 | if (!dev) { | |
74 | if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) { | |
75 | saddr = &x->props.saddr; | |
76 | daddr = &x->id.daddr; | |
77 | } else { | |
78 | saddr = &x->id.daddr; | |
79 | daddr = &x->props.saddr; | |
80 | } | |
81 | ||
82 | dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr, x->props.family); | |
83 | if (IS_ERR(dst)) | |
84 | return 0; | |
85 | ||
86 | dev = dst->dev; | |
87 | ||
88 | dev_hold(dev); | |
89 | dst_release(dst); | |
90 | } | |
91 | ||
92 | if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) { | |
93 | dev_put(dev); | |
94 | return 0; | |
95 | } | |
96 | ||
97 | xso->dev = dev; | |
98 | xso->num_exthdrs = 1; | |
99 | xso->flags = xuo->flags; | |
100 | ||
101 | err = dev->xfrmdev_ops->xdo_dev_state_add(x); | |
102 | if (err) { | |
103 | dev_put(dev); | |
104 | return err; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(xfrm_dev_state_add); | |
110 | ||
111 | bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) | |
112 | { | |
113 | int mtu; | |
114 | struct dst_entry *dst = skb_dst(skb); | |
115 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
116 | struct net_device *dev = x->xso.dev; | |
117 | ||
118 | if (!x->type_offload || x->encap) | |
119 | return false; | |
120 | ||
121 | if ((x->xso.offload_handle && (dev == dst->path->dev)) && | |
122 | !dst->child->xfrm && x->type->get_mtu) { | |
123 | mtu = x->type->get_mtu(x, xdst->child_mtu_cached); | |
124 | ||
125 | if (skb->len <= mtu) | |
126 | goto ok; | |
127 | ||
128 | if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu)) | |
129 | goto ok; | |
130 | } | |
131 | ||
132 | return false; | |
133 | ||
134 | ok: | |
135 | if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok) | |
136 | return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x); | |
137 | ||
138 | return true; | |
139 | } | |
140 | EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok); | |
b81f884a | 141 | #endif |
d77e38e6 | 142 | |
24d472e4 | 143 | static int xfrm_dev_register(struct net_device *dev) |
d77e38e6 SK |
144 | { |
145 | if ((dev->features & NETIF_F_HW_ESP) && !dev->xfrmdev_ops) | |
146 | return NOTIFY_BAD; | |
147 | if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) && | |
148 | !(dev->features & NETIF_F_HW_ESP)) | |
149 | return NOTIFY_BAD; | |
150 | ||
151 | return NOTIFY_DONE; | |
152 | } | |
153 | ||
154 | static int xfrm_dev_unregister(struct net_device *dev) | |
155 | { | |
156 | return NOTIFY_DONE; | |
157 | } | |
158 | ||
159 | static int xfrm_dev_feat_change(struct net_device *dev) | |
160 | { | |
161 | if ((dev->features & NETIF_F_HW_ESP) && !dev->xfrmdev_ops) | |
162 | return NOTIFY_BAD; | |
163 | else if (!(dev->features & NETIF_F_HW_ESP)) | |
164 | dev->xfrmdev_ops = NULL; | |
165 | ||
166 | if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) && | |
167 | !(dev->features & NETIF_F_HW_ESP)) | |
168 | return NOTIFY_BAD; | |
169 | ||
170 | return NOTIFY_DONE; | |
171 | } | |
172 | ||
173 | static int xfrm_dev_down(struct net_device *dev) | |
174 | { | |
2c1497bb | 175 | if (dev->features & NETIF_F_HW_ESP) |
d77e38e6 SK |
176 | xfrm_dev_state_flush(dev_net(dev), dev, true); |
177 | ||
178 | xfrm_garbage_collect(dev_net(dev)); | |
179 | ||
180 | return NOTIFY_DONE; | |
181 | } | |
182 | ||
21f42cc9 SK |
183 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
184 | { | |
185 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
186 | ||
187 | switch (event) { | |
d77e38e6 SK |
188 | case NETDEV_REGISTER: |
189 | return xfrm_dev_register(dev); | |
190 | ||
191 | case NETDEV_UNREGISTER: | |
192 | return xfrm_dev_unregister(dev); | |
193 | ||
194 | case NETDEV_FEAT_CHANGE: | |
195 | return xfrm_dev_feat_change(dev); | |
196 | ||
21f42cc9 | 197 | case NETDEV_DOWN: |
d77e38e6 | 198 | return xfrm_dev_down(dev); |
21f42cc9 SK |
199 | } |
200 | return NOTIFY_DONE; | |
201 | } | |
202 | ||
203 | static struct notifier_block xfrm_dev_notifier = { | |
204 | .notifier_call = xfrm_dev_event, | |
205 | }; | |
206 | ||
207 | void __net_init xfrm_dev_init(void) | |
208 | { | |
209 | register_netdevice_notifier(&xfrm_dev_notifier); | |
210 | } |