This source file includes following definitions.
- esp4_gro_receive
- esp4_gso_encap
- xfrm4_tunnel_gso_segment
- xfrm4_transport_gso_segment
- xfrm4_outer_mode_gso_segment
- esp4_gso_segment
- esp_input_tail
- esp_xmit
- esp4_offload_init
- esp4_offload_exit
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12 #include <linux/skbuff.h>
13 #include <linux/init.h>
14 #include <net/protocol.h>
15 #include <crypto/aead.h>
16 #include <crypto/authenc.h>
17 #include <linux/err.h>
18 #include <linux/module.h>
19 #include <net/ip.h>
20 #include <net/xfrm.h>
21 #include <net/esp.h>
22 #include <linux/scatterlist.h>
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include <net/udp.h>
27
28 static struct sk_buff *esp4_gro_receive(struct list_head *head,
29 struct sk_buff *skb)
30 {
31 int offset = skb_gro_offset(skb);
32 struct xfrm_offload *xo;
33 struct xfrm_state *x;
34 __be32 seq;
35 __be32 spi;
36 int err;
37
38 if (!pskb_pull(skb, offset))
39 return NULL;
40
41 if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
42 goto out;
43
44 xo = xfrm_offload(skb);
45 if (!xo || !(xo->flags & CRYPTO_DONE)) {
46 struct sec_path *sp = secpath_set(skb);
47
48 if (!sp)
49 goto out;
50
51 if (sp->len == XFRM_MAX_DEPTH)
52 goto out_reset;
53
54 x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
55 (xfrm_address_t *)&ip_hdr(skb)->daddr,
56 spi, IPPROTO_ESP, AF_INET);
57 if (!x)
58 goto out_reset;
59
60 skb->mark = xfrm_smark_get(skb->mark, x);
61
62 sp->xvec[sp->len++] = x;
63 sp->olen++;
64
65 xo = xfrm_offload(skb);
66 if (!xo)
67 goto out_reset;
68 }
69
70 xo->flags |= XFRM_GRO;
71
72 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
73 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
74 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
75 XFRM_SPI_SKB_CB(skb)->seq = seq;
76
77
78
79 xfrm_input(skb, IPPROTO_ESP, spi, -2);
80
81 return ERR_PTR(-EINPROGRESS);
82 out_reset:
83 secpath_reset(skb);
84 out:
85 skb_push(skb, offset);
86 NAPI_GRO_CB(skb)->same_flow = 0;
87 NAPI_GRO_CB(skb)->flush = 1;
88
89 return NULL;
90 }
91
92 static void esp4_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
93 {
94 struct ip_esp_hdr *esph;
95 struct iphdr *iph = ip_hdr(skb);
96 struct xfrm_offload *xo = xfrm_offload(skb);
97 int proto = iph->protocol;
98
99 skb_push(skb, -skb_network_offset(skb));
100 esph = ip_esp_hdr(skb);
101 *skb_mac_header(skb) = IPPROTO_ESP;
102
103 esph->spi = x->id.spi;
104 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
105
106 xo->proto = proto;
107 }
108
109 static struct sk_buff *xfrm4_tunnel_gso_segment(struct xfrm_state *x,
110 struct sk_buff *skb,
111 netdev_features_t features)
112 {
113 __skb_push(skb, skb->mac_len);
114 return skb_mac_gso_segment(skb, features);
115 }
116
117 static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,
118 struct sk_buff *skb,
119 netdev_features_t features)
120 {
121 const struct net_offload *ops;
122 struct sk_buff *segs = ERR_PTR(-EINVAL);
123 struct xfrm_offload *xo = xfrm_offload(skb);
124
125 skb->transport_header += x->props.header_len;
126 ops = rcu_dereference(inet_offloads[xo->proto]);
127 if (likely(ops && ops->callbacks.gso_segment))
128 segs = ops->callbacks.gso_segment(skb, features);
129
130 return segs;
131 }
132
133 static struct sk_buff *xfrm4_outer_mode_gso_segment(struct xfrm_state *x,
134 struct sk_buff *skb,
135 netdev_features_t features)
136 {
137 switch (x->outer_mode.encap) {
138 case XFRM_MODE_TUNNEL:
139 return xfrm4_tunnel_gso_segment(x, skb, features);
140 case XFRM_MODE_TRANSPORT:
141 return xfrm4_transport_gso_segment(x, skb, features);
142 }
143
144 return ERR_PTR(-EOPNOTSUPP);
145 }
146
147 static struct sk_buff *esp4_gso_segment(struct sk_buff *skb,
148 netdev_features_t features)
149 {
150 struct xfrm_state *x;
151 struct ip_esp_hdr *esph;
152 struct crypto_aead *aead;
153 netdev_features_t esp_features = features;
154 struct xfrm_offload *xo = xfrm_offload(skb);
155 struct sec_path *sp;
156
157 if (!xo)
158 return ERR_PTR(-EINVAL);
159
160 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP))
161 return ERR_PTR(-EINVAL);
162
163 sp = skb_sec_path(skb);
164 x = sp->xvec[sp->len - 1];
165 aead = x->data;
166 esph = ip_esp_hdr(skb);
167
168 if (esph->spi != x->id.spi)
169 return ERR_PTR(-EINVAL);
170
171 if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
172 return ERR_PTR(-EINVAL);
173
174 __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
175
176 skb->encap_hdr_csum = 1;
177
178 if ((!(skb->dev->gso_partial_features & NETIF_F_HW_ESP) &&
179 !(features & NETIF_F_HW_ESP)) || x->xso.dev != skb->dev)
180 esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
181 else if (!(features & NETIF_F_HW_ESP_TX_CSUM) &&
182 !(skb->dev->gso_partial_features & NETIF_F_HW_ESP_TX_CSUM))
183 esp_features = features & ~NETIF_F_CSUM_MASK;
184
185 xo->flags |= XFRM_GSO_SEGMENT;
186
187 return xfrm4_outer_mode_gso_segment(x, skb, esp_features);
188 }
189
190 static int esp_input_tail(struct xfrm_state *x, struct sk_buff *skb)
191 {
192 struct crypto_aead *aead = x->data;
193 struct xfrm_offload *xo = xfrm_offload(skb);
194
195 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead)))
196 return -EINVAL;
197
198 if (!(xo->flags & CRYPTO_DONE))
199 skb->ip_summed = CHECKSUM_NONE;
200
201 return esp_input_done2(skb, 0);
202 }
203
204 static int esp_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features)
205 {
206 int err;
207 int alen;
208 int blksize;
209 struct xfrm_offload *xo;
210 struct ip_esp_hdr *esph;
211 struct crypto_aead *aead;
212 struct esp_info esp;
213 bool hw_offload = true;
214 __u32 seq;
215
216 esp.inplace = true;
217
218 xo = xfrm_offload(skb);
219
220 if (!xo)
221 return -EINVAL;
222
223 if ((!(features & NETIF_F_HW_ESP) &&
224 !(skb->dev->gso_partial_features & NETIF_F_HW_ESP)) ||
225 x->xso.dev != skb->dev) {
226 xo->flags |= CRYPTO_FALLBACK;
227 hw_offload = false;
228 }
229
230 esp.proto = xo->proto;
231
232
233
234 aead = x->data;
235 alen = crypto_aead_authsize(aead);
236
237 esp.tfclen = 0;
238
239
240 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
241 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
242 esp.plen = esp.clen - skb->len - esp.tfclen;
243 esp.tailen = esp.tfclen + esp.plen + alen;
244
245 esp.esph = ip_esp_hdr(skb);
246
247
248 if (!hw_offload || (hw_offload && !skb_is_gso(skb))) {
249 esp.nfrags = esp_output_head(x, skb, &esp);
250 if (esp.nfrags < 0)
251 return esp.nfrags;
252 }
253
254 seq = xo->seq.low;
255
256 esph = esp.esph;
257 esph->spi = x->id.spi;
258
259 skb_push(skb, -skb_network_offset(skb));
260
261 if (xo->flags & XFRM_GSO_SEGMENT) {
262 esph->seq_no = htonl(seq);
263
264 if (!skb_is_gso(skb))
265 xo->seq.low++;
266 else
267 xo->seq.low += skb_shinfo(skb)->gso_segs;
268 }
269
270 esp.seqno = cpu_to_be64(seq + ((u64)xo->seq.hi << 32));
271
272 ip_hdr(skb)->tot_len = htons(skb->len);
273 ip_send_check(ip_hdr(skb));
274
275 if (hw_offload)
276 return 0;
277
278 err = esp_output_tail(x, skb, &esp);
279 if (err)
280 return err;
281
282 secpath_reset(skb);
283
284 return 0;
285 }
286
287 static const struct net_offload esp4_offload = {
288 .callbacks = {
289 .gro_receive = esp4_gro_receive,
290 .gso_segment = esp4_gso_segment,
291 },
292 };
293
294 static const struct xfrm_type_offload esp_type_offload = {
295 .description = "ESP4 OFFLOAD",
296 .owner = THIS_MODULE,
297 .proto = IPPROTO_ESP,
298 .input_tail = esp_input_tail,
299 .xmit = esp_xmit,
300 .encap = esp4_gso_encap,
301 };
302
303 static int __init esp4_offload_init(void)
304 {
305 if (xfrm_register_type_offload(&esp_type_offload, AF_INET) < 0) {
306 pr_info("%s: can't add xfrm type offload\n", __func__);
307 return -EAGAIN;
308 }
309
310 return inet_add_offload(&esp4_offload, IPPROTO_ESP);
311 }
312
313 static void __exit esp4_offload_exit(void)
314 {
315 xfrm_unregister_type_offload(&esp_type_offload, AF_INET);
316 inet_del_offload(&esp4_offload, IPPROTO_ESP);
317 }
318
319 module_init(esp4_offload_init);
320 module_exit(esp4_offload_exit);
321 MODULE_LICENSE("GPL");
322 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
323 MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET, XFRM_PROTO_ESP);