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75a6faf6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7785bba2 SK |
2 | /* |
3 | * IPV6 GSO/GRO offload support | |
4 | * Linux INET implementation | |
5 | * | |
6 | * Copyright (C) 2016 secunet Security Networks AG | |
7 | * Author: Steffen Klassert <steffen.klassert@secunet.com> | |
8 | * | |
7785bba2 SK |
9 | * ESP GRO support |
10 | */ | |
11 | ||
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/ip6_route.h> | |
27 | #include <net/ipv6.h> | |
28 | #include <linux/icmpv6.h> | |
29 | ||
ca3a1b85 YK |
30 | static __u16 esp6_nexthdr_esp_offset(struct ipv6hdr *ipv6_hdr, int nhlen) |
31 | { | |
32 | int off = sizeof(struct ipv6hdr); | |
33 | struct ipv6_opt_hdr *exthdr; | |
34 | ||
35 | if (likely(ipv6_hdr->nexthdr == NEXTHDR_ESP)) | |
36 | return offsetof(struct ipv6hdr, nexthdr); | |
37 | ||
38 | while (off < nhlen) { | |
39 | exthdr = (void *)ipv6_hdr + off; | |
40 | if (exthdr->nexthdr == NEXTHDR_ESP) | |
41 | return off; | |
42 | ||
43 | off += ipv6_optlen(exthdr); | |
44 | } | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
d4546c25 DM |
49 | static struct sk_buff *esp6_gro_receive(struct list_head *head, |
50 | struct sk_buff *skb) | |
7785bba2 SK |
51 | { |
52 | int offset = skb_gro_offset(skb); | |
53 | struct xfrm_offload *xo; | |
54 | struct xfrm_state *x; | |
55 | __be32 seq; | |
56 | __be32 spi; | |
ca3a1b85 | 57 | int nhoff; |
7785bba2 SK |
58 | int err; |
59 | ||
374d1b5a SK |
60 | if (!pskb_pull(skb, offset)) |
61 | return NULL; | |
7785bba2 SK |
62 | |
63 | if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0) | |
64 | goto out; | |
65 | ||
bcd1f8a4 SK |
66 | xo = xfrm_offload(skb); |
67 | if (!xo || !(xo->flags & CRYPTO_DONE)) { | |
0ca64da1 FW |
68 | struct sec_path *sp = secpath_set(skb); |
69 | ||
70 | if (!sp) | |
bcd1f8a4 | 71 | goto out; |
7785bba2 | 72 | |
0ca64da1 | 73 | if (sp->len == XFRM_MAX_DEPTH) |
6ed69184 | 74 | goto out_reset; |
7785bba2 | 75 | |
bcd1f8a4 SK |
76 | x = xfrm_state_lookup(dev_net(skb->dev), skb->mark, |
77 | (xfrm_address_t *)&ipv6_hdr(skb)->daddr, | |
78 | spi, IPPROTO_ESP, AF_INET6); | |
79 | if (!x) | |
6ed69184 | 80 | goto out_reset; |
7785bba2 | 81 | |
4e4362d2 UW |
82 | skb->mark = xfrm_smark_get(skb->mark, x); |
83 | ||
0ca64da1 FW |
84 | sp->xvec[sp->len++] = x; |
85 | sp->olen++; | |
7785bba2 | 86 | |
bcd1f8a4 SK |
87 | xo = xfrm_offload(skb); |
88 | if (!xo) { | |
89 | xfrm_state_put(x); | |
6ed69184 | 90 | goto out_reset; |
bcd1f8a4 | 91 | } |
7785bba2 | 92 | } |
bcd1f8a4 | 93 | |
7785bba2 SK |
94 | xo->flags |= XFRM_GRO; |
95 | ||
ca3a1b85 YK |
96 | nhoff = esp6_nexthdr_esp_offset(ipv6_hdr(skb), offset); |
97 | if (!nhoff) | |
98 | goto out; | |
99 | ||
100 | IP6CB(skb)->nhoff = nhoff; | |
7785bba2 SK |
101 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL; |
102 | XFRM_SPI_SKB_CB(skb)->family = AF_INET6; | |
103 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); | |
104 | XFRM_SPI_SKB_CB(skb)->seq = seq; | |
105 | ||
106 | /* We don't need to handle errors from xfrm_input, it does all | |
107 | * the error handling and frees the resources on error. */ | |
108 | xfrm_input(skb, IPPROTO_ESP, spi, -2); | |
109 | ||
110 | return ERR_PTR(-EINPROGRESS); | |
6ed69184 MJ |
111 | out_reset: |
112 | secpath_reset(skb); | |
7785bba2 SK |
113 | out: |
114 | skb_push(skb, offset); | |
115 | NAPI_GRO_CB(skb)->same_flow = 0; | |
116 | NAPI_GRO_CB(skb)->flush = 1; | |
117 | ||
118 | return NULL; | |
119 | } | |
120 | ||
7862b405 SK |
121 | static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb) |
122 | { | |
123 | struct ip_esp_hdr *esph; | |
124 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
125 | struct xfrm_offload *xo = xfrm_offload(skb); | |
126 | int proto = iph->nexthdr; | |
127 | ||
128 | skb_push(skb, -skb_network_offset(skb)); | |
129 | esph = ip_esp_hdr(skb); | |
130 | *skb_mac_header(skb) = IPPROTO_ESP; | |
131 | ||
132 | esph->spi = x->id.spi; | |
133 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); | |
134 | ||
135 | xo->proto = proto; | |
136 | } | |
137 | ||
7613b92b FW |
138 | static struct sk_buff *xfrm6_tunnel_gso_segment(struct xfrm_state *x, |
139 | struct sk_buff *skb, | |
140 | netdev_features_t features) | |
141 | { | |
142 | __skb_push(skb, skb->mac_len); | |
143 | return skb_mac_gso_segment(skb, features); | |
144 | } | |
145 | ||
146 | static struct sk_buff *xfrm6_transport_gso_segment(struct xfrm_state *x, | |
147 | struct sk_buff *skb, | |
148 | netdev_features_t features) | |
149 | { | |
150 | const struct net_offload *ops; | |
151 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
152 | struct xfrm_offload *xo = xfrm_offload(skb); | |
153 | ||
154 | skb->transport_header += x->props.header_len; | |
155 | ops = rcu_dereference(inet6_offloads[xo->proto]); | |
156 | if (likely(ops && ops->callbacks.gso_segment)) | |
157 | segs = ops->callbacks.gso_segment(skb, features); | |
158 | ||
159 | return segs; | |
160 | } | |
161 | ||
162 | static struct sk_buff *xfrm6_outer_mode_gso_segment(struct xfrm_state *x, | |
163 | struct sk_buff *skb, | |
164 | netdev_features_t features) | |
165 | { | |
c9500d7b | 166 | switch (x->outer_mode.encap) { |
7613b92b FW |
167 | case XFRM_MODE_TUNNEL: |
168 | return xfrm6_tunnel_gso_segment(x, skb, features); | |
169 | case XFRM_MODE_TRANSPORT: | |
170 | return xfrm6_transport_gso_segment(x, skb, features); | |
171 | } | |
172 | ||
173 | return ERR_PTR(-EOPNOTSUPP); | |
174 | } | |
175 | ||
7862b405 SK |
176 | static struct sk_buff *esp6_gso_segment(struct sk_buff *skb, |
177 | netdev_features_t features) | |
178 | { | |
7862b405 SK |
179 | struct xfrm_state *x; |
180 | struct ip_esp_hdr *esph; | |
181 | struct crypto_aead *aead; | |
7862b405 SK |
182 | netdev_features_t esp_features = features; |
183 | struct xfrm_offload *xo = xfrm_offload(skb); | |
2294be0f | 184 | struct sec_path *sp; |
7862b405 | 185 | |
ffa6f571 | 186 | if (!xo) |
3dca3f38 | 187 | return ERR_PTR(-EINVAL); |
7862b405 | 188 | |
121d57af | 189 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP)) |
5ca11440 | 190 | return ERR_PTR(-EINVAL); |
7862b405 | 191 | |
2294be0f FW |
192 | sp = skb_sec_path(skb); |
193 | x = sp->xvec[sp->len - 1]; | |
7862b405 SK |
194 | aead = x->data; |
195 | esph = ip_esp_hdr(skb); | |
196 | ||
197 | if (esph->spi != x->id.spi) | |
3dca3f38 | 198 | return ERR_PTR(-EINVAL); |
7862b405 SK |
199 | |
200 | if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) | |
3dca3f38 | 201 | return ERR_PTR(-EINVAL); |
7862b405 SK |
202 | |
203 | __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)); | |
204 | ||
205 | skb->encap_hdr_csum = 1; | |
206 | ||
fcb662de | 207 | if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) |
7862b405 | 208 | esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK); |
5211fcfb SN |
209 | else if (!(features & NETIF_F_HW_ESP_TX_CSUM)) |
210 | esp_features = features & ~NETIF_F_CSUM_MASK; | |
7862b405 | 211 | |
3dca3f38 | 212 | xo->flags |= XFRM_GSO_SEGMENT; |
7862b405 | 213 | |
7613b92b | 214 | return xfrm6_outer_mode_gso_segment(x, skb, esp_features); |
7862b405 SK |
215 | } |
216 | ||
383d0350 SK |
217 | static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb) |
218 | { | |
219 | struct crypto_aead *aead = x->data; | |
e51a6472 | 220 | struct xfrm_offload *xo = xfrm_offload(skb); |
383d0350 SK |
221 | |
222 | if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead))) | |
223 | return -EINVAL; | |
224 | ||
e51a6472 IT |
225 | if (!(xo->flags & CRYPTO_DONE)) |
226 | skb->ip_summed = CHECKSUM_NONE; | |
383d0350 SK |
227 | |
228 | return esp6_input_done2(skb, 0); | |
229 | } | |
230 | ||
231 | static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features) | |
232 | { | |
3dca3f38 | 233 | int len; |
383d0350 SK |
234 | int err; |
235 | int alen; | |
236 | int blksize; | |
237 | struct xfrm_offload *xo; | |
238 | struct ip_esp_hdr *esph; | |
239 | struct crypto_aead *aead; | |
240 | struct esp_info esp; | |
241 | bool hw_offload = true; | |
3dca3f38 | 242 | __u32 seq; |
383d0350 SK |
243 | |
244 | esp.inplace = true; | |
245 | ||
246 | xo = xfrm_offload(skb); | |
247 | ||
248 | if (!xo) | |
249 | return -EINVAL; | |
250 | ||
fcb662de | 251 | if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) { |
383d0350 | 252 | xo->flags |= CRYPTO_FALLBACK; |
8f92e03e | 253 | hw_offload = false; |
383d0350 SK |
254 | } |
255 | ||
256 | esp.proto = xo->proto; | |
257 | ||
258 | /* skb is pure payload to encrypt */ | |
259 | ||
260 | aead = x->data; | |
261 | alen = crypto_aead_authsize(aead); | |
262 | ||
263 | esp.tfclen = 0; | |
264 | /* XXX: Add support for tfc padding here. */ | |
265 | ||
266 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
267 | esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); | |
268 | esp.plen = esp.clen - skb->len - esp.tfclen; | |
269 | esp.tailen = esp.tfclen + esp.plen + alen; | |
270 | ||
271 | if (!hw_offload || (hw_offload && !skb_is_gso(skb))) { | |
272 | esp.nfrags = esp6_output_head(x, skb, &esp); | |
273 | if (esp.nfrags < 0) | |
274 | return esp.nfrags; | |
275 | } | |
276 | ||
3dca3f38 SK |
277 | seq = xo->seq.low; |
278 | ||
383d0350 SK |
279 | esph = ip_esp_hdr(skb); |
280 | esph->spi = x->id.spi; | |
281 | ||
282 | skb_push(skb, -skb_network_offset(skb)); | |
283 | ||
284 | if (xo->flags & XFRM_GSO_SEGMENT) { | |
3dca3f38 | 285 | esph->seq_no = htonl(seq); |
383d0350 | 286 | |
3dca3f38 SK |
287 | if (!skb_is_gso(skb)) |
288 | xo->seq.low++; | |
289 | else | |
290 | xo->seq.low += skb_shinfo(skb)->gso_segs; | |
383d0350 SK |
291 | } |
292 | ||
3dca3f38 SK |
293 | esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32)); |
294 | ||
295 | len = skb->len - sizeof(struct ipv6hdr); | |
296 | if (len > IPV6_MAXPLEN) | |
297 | len = 0; | |
298 | ||
299 | ipv6_hdr(skb)->payload_len = htons(len); | |
300 | ||
8f92e03e | 301 | if (hw_offload) |
383d0350 SK |
302 | return 0; |
303 | ||
383d0350 | 304 | err = esp6_output_tail(x, skb, &esp); |
4ff0308f | 305 | if (err) |
383d0350 SK |
306 | return err; |
307 | ||
308 | secpath_reset(skb); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
7785bba2 SK |
313 | static const struct net_offload esp6_offload = { |
314 | .callbacks = { | |
315 | .gro_receive = esp6_gro_receive, | |
7862b405 | 316 | .gso_segment = esp6_gso_segment, |
7785bba2 SK |
317 | }, |
318 | }; | |
319 | ||
383d0350 SK |
320 | static const struct xfrm_type_offload esp6_type_offload = { |
321 | .description = "ESP6 OFFLOAD", | |
322 | .owner = THIS_MODULE, | |
323 | .proto = IPPROTO_ESP, | |
324 | .input_tail = esp6_input_tail, | |
325 | .xmit = esp6_xmit, | |
7862b405 | 326 | .encap = esp6_gso_encap, |
383d0350 SK |
327 | }; |
328 | ||
7785bba2 SK |
329 | static int __init esp6_offload_init(void) |
330 | { | |
383d0350 SK |
331 | if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) { |
332 | pr_info("%s: can't add xfrm type offload\n", __func__); | |
333 | return -EAGAIN; | |
334 | } | |
335 | ||
7785bba2 SK |
336 | return inet6_add_offload(&esp6_offload, IPPROTO_ESP); |
337 | } | |
338 | ||
339 | static void __exit esp6_offload_exit(void) | |
340 | { | |
4f518e80 | 341 | xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6); |
7785bba2 SK |
342 | inet6_del_offload(&esp6_offload, IPPROTO_ESP); |
343 | } | |
344 | ||
345 | module_init(esp6_offload_init); | |
346 | module_exit(esp6_offload_exit); | |
347 | MODULE_LICENSE("GPL"); | |
348 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
ffdb5211 | 349 | MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET6, XFRM_PROTO_ESP); |