Commit | Line | Data |
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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> | |
4721031c | 19 | #include <net/gro.h> |
7785bba2 SK |
20 | #include <net/ip.h> |
21 | #include <net/xfrm.h> | |
22 | #include <net/esp.h> | |
23 | #include <linux/scatterlist.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <net/ip6_route.h> | |
28 | #include <net/ipv6.h> | |
29 | #include <linux/icmpv6.h> | |
30 | ||
ca3a1b85 YK |
31 | static __u16 esp6_nexthdr_esp_offset(struct ipv6hdr *ipv6_hdr, int nhlen) |
32 | { | |
33 | int off = sizeof(struct ipv6hdr); | |
34 | struct ipv6_opt_hdr *exthdr; | |
35 | ||
36 | if (likely(ipv6_hdr->nexthdr == NEXTHDR_ESP)) | |
37 | return offsetof(struct ipv6hdr, nexthdr); | |
38 | ||
39 | while (off < nhlen) { | |
40 | exthdr = (void *)ipv6_hdr + off; | |
41 | if (exthdr->nexthdr == NEXTHDR_ESP) | |
42 | return off; | |
43 | ||
44 | off += ipv6_optlen(exthdr); | |
45 | } | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
d4546c25 DM |
50 | static struct sk_buff *esp6_gro_receive(struct list_head *head, |
51 | struct sk_buff *skb) | |
7785bba2 SK |
52 | { |
53 | int offset = skb_gro_offset(skb); | |
54 | struct xfrm_offload *xo; | |
55 | struct xfrm_state *x; | |
56 | __be32 seq; | |
57 | __be32 spi; | |
ca3a1b85 | 58 | int nhoff; |
7785bba2 | 59 | |
374d1b5a SK |
60 | if (!pskb_pull(skb, offset)) |
61 | return NULL; | |
7785bba2 | 62 | |
e91001ba | 63 | if (xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq) != 0) |
7785bba2 SK |
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 | 87 | xo = xfrm_offload(skb); |
db87668a | 88 | if (!xo) |
6ed69184 | 89 | goto out_reset; |
7785bba2 | 90 | } |
bcd1f8a4 | 91 | |
7785bba2 SK |
92 | xo->flags |= XFRM_GRO; |
93 | ||
ca3a1b85 YK |
94 | nhoff = esp6_nexthdr_esp_offset(ipv6_hdr(skb), offset); |
95 | if (!nhoff) | |
96 | goto out; | |
97 | ||
98 | IP6CB(skb)->nhoff = nhoff; | |
7785bba2 SK |
99 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL; |
100 | XFRM_SPI_SKB_CB(skb)->family = AF_INET6; | |
101 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); | |
102 | XFRM_SPI_SKB_CB(skb)->seq = seq; | |
103 | ||
104 | /* We don't need to handle errors from xfrm_input, it does all | |
105 | * the error handling and frees the resources on error. */ | |
106 | xfrm_input(skb, IPPROTO_ESP, spi, -2); | |
107 | ||
108 | return ERR_PTR(-EINPROGRESS); | |
6ed69184 MJ |
109 | out_reset: |
110 | secpath_reset(skb); | |
7785bba2 SK |
111 | out: |
112 | skb_push(skb, offset); | |
113 | NAPI_GRO_CB(skb)->same_flow = 0; | |
114 | NAPI_GRO_CB(skb)->flush = 1; | |
115 | ||
116 | return NULL; | |
117 | } | |
118 | ||
7862b405 SK |
119 | static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb) |
120 | { | |
121 | struct ip_esp_hdr *esph; | |
122 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
123 | struct xfrm_offload *xo = xfrm_offload(skb); | |
3c96ec56 | 124 | u8 proto = iph->nexthdr; |
7862b405 SK |
125 | |
126 | skb_push(skb, -skb_network_offset(skb)); | |
3c96ec56 XL |
127 | |
128 | if (x->outer_mode.encap == XFRM_MODE_TRANSPORT) { | |
129 | __be16 frag; | |
130 | ||
131 | ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto, &frag); | |
132 | } | |
133 | ||
7862b405 SK |
134 | esph = ip_esp_hdr(skb); |
135 | *skb_mac_header(skb) = IPPROTO_ESP; | |
136 | ||
137 | esph->spi = x->id.spi; | |
138 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); | |
139 | ||
140 | xo->proto = proto; | |
141 | } | |
142 | ||
7613b92b FW |
143 | static struct sk_buff *xfrm6_tunnel_gso_segment(struct xfrm_state *x, |
144 | struct sk_buff *skb, | |
145 | netdev_features_t features) | |
146 | { | |
26dbd66e SD |
147 | __be16 type = x->inner_mode.family == AF_INET ? htons(ETH_P_IP) |
148 | : htons(ETH_P_IPV6); | |
149 | ||
150 | return skb_eth_gso_segment(skb, features, type); | |
7613b92b FW |
151 | } |
152 | ||
153 | static struct sk_buff *xfrm6_transport_gso_segment(struct xfrm_state *x, | |
154 | struct sk_buff *skb, | |
155 | netdev_features_t features) | |
156 | { | |
157 | const struct net_offload *ops; | |
158 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
159 | struct xfrm_offload *xo = xfrm_offload(skb); | |
160 | ||
161 | skb->transport_header += x->props.header_len; | |
162 | ops = rcu_dereference(inet6_offloads[xo->proto]); | |
163 | if (likely(ops && ops->callbacks.gso_segment)) | |
164 | segs = ops->callbacks.gso_segment(skb, features); | |
165 | ||
166 | return segs; | |
167 | } | |
168 | ||
7f9e40eb XL |
169 | static struct sk_buff *xfrm6_beet_gso_segment(struct xfrm_state *x, |
170 | struct sk_buff *skb, | |
171 | netdev_features_t features) | |
172 | { | |
173 | struct xfrm_offload *xo = xfrm_offload(skb); | |
174 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
175 | const struct net_offload *ops; | |
25a44ae9 | 176 | u8 proto = xo->proto; |
7f9e40eb XL |
177 | |
178 | skb->transport_header += x->props.header_len; | |
179 | ||
7f9e40eb XL |
180 | if (x->sel.family != AF_INET6) { |
181 | skb->transport_header -= | |
182 | (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); | |
183 | ||
56b1b7c6 XL |
184 | if (proto == IPPROTO_BEETPH) { |
185 | struct ip_beet_phdr *ph = | |
186 | (struct ip_beet_phdr *)skb->data; | |
187 | ||
188 | skb->transport_header += ph->hdrlen * 8; | |
189 | proto = ph->nexthdr; | |
190 | } else { | |
191 | skb->transport_header -= IPV4_BEET_PHMAXLEN; | |
192 | } | |
7f9e40eb | 193 | |
7f9e40eb XL |
194 | if (proto == IPPROTO_TCP) |
195 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6; | |
56b1b7c6 | 196 | } else { |
25a44ae9 XL |
197 | __be16 frag; |
198 | ||
199 | skb->transport_header += | |
200 | ipv6_skip_exthdr(skb, 0, &proto, &frag); | |
7f9e40eb XL |
201 | } |
202 | ||
053c8fdf SK |
203 | if (proto == IPPROTO_IPIP) |
204 | skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6; | |
205 | ||
7f9e40eb XL |
206 | __skb_pull(skb, skb_transport_offset(skb)); |
207 | ops = rcu_dereference(inet6_offloads[proto]); | |
208 | if (likely(ops && ops->callbacks.gso_segment)) | |
209 | segs = ops->callbacks.gso_segment(skb, features); | |
210 | ||
211 | return segs; | |
212 | } | |
213 | ||
7613b92b FW |
214 | static struct sk_buff *xfrm6_outer_mode_gso_segment(struct xfrm_state *x, |
215 | struct sk_buff *skb, | |
216 | netdev_features_t features) | |
217 | { | |
c9500d7b | 218 | switch (x->outer_mode.encap) { |
7613b92b FW |
219 | case XFRM_MODE_TUNNEL: |
220 | return xfrm6_tunnel_gso_segment(x, skb, features); | |
221 | case XFRM_MODE_TRANSPORT: | |
222 | return xfrm6_transport_gso_segment(x, skb, features); | |
7f9e40eb XL |
223 | case XFRM_MODE_BEET: |
224 | return xfrm6_beet_gso_segment(x, skb, features); | |
7613b92b FW |
225 | } |
226 | ||
227 | return ERR_PTR(-EOPNOTSUPP); | |
228 | } | |
229 | ||
7862b405 SK |
230 | static struct sk_buff *esp6_gso_segment(struct sk_buff *skb, |
231 | netdev_features_t features) | |
232 | { | |
7862b405 SK |
233 | struct xfrm_state *x; |
234 | struct ip_esp_hdr *esph; | |
235 | struct crypto_aead *aead; | |
7862b405 SK |
236 | netdev_features_t esp_features = features; |
237 | struct xfrm_offload *xo = xfrm_offload(skb); | |
2294be0f | 238 | struct sec_path *sp; |
7862b405 | 239 | |
ffa6f571 | 240 | if (!xo) |
3dca3f38 | 241 | return ERR_PTR(-EINVAL); |
7862b405 | 242 | |
121d57af | 243 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP)) |
5ca11440 | 244 | return ERR_PTR(-EINVAL); |
7862b405 | 245 | |
2294be0f FW |
246 | sp = skb_sec_path(skb); |
247 | x = sp->xvec[sp->len - 1]; | |
7862b405 SK |
248 | aead = x->data; |
249 | esph = ip_esp_hdr(skb); | |
250 | ||
251 | if (esph->spi != x->id.spi) | |
3dca3f38 | 252 | return ERR_PTR(-EINVAL); |
7862b405 SK |
253 | |
254 | if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) | |
3dca3f38 | 255 | return ERR_PTR(-EINVAL); |
7862b405 SK |
256 | |
257 | __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)); | |
258 | ||
259 | skb->encap_hdr_csum = 1; | |
260 | ||
fcb662de | 261 | if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) |
154deab6 XL |
262 | esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK | |
263 | NETIF_F_SCTP_CRC); | |
5211fcfb | 264 | else if (!(features & NETIF_F_HW_ESP_TX_CSUM)) |
154deab6 XL |
265 | esp_features = features & ~(NETIF_F_CSUM_MASK | |
266 | NETIF_F_SCTP_CRC); | |
7862b405 | 267 | |
3dca3f38 | 268 | xo->flags |= XFRM_GSO_SEGMENT; |
7862b405 | 269 | |
7613b92b | 270 | return xfrm6_outer_mode_gso_segment(x, skb, esp_features); |
7862b405 SK |
271 | } |
272 | ||
383d0350 SK |
273 | static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb) |
274 | { | |
275 | struct crypto_aead *aead = x->data; | |
e51a6472 | 276 | struct xfrm_offload *xo = xfrm_offload(skb); |
383d0350 SK |
277 | |
278 | if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead))) | |
279 | return -EINVAL; | |
280 | ||
e51a6472 IT |
281 | if (!(xo->flags & CRYPTO_DONE)) |
282 | skb->ip_summed = CHECKSUM_NONE; | |
383d0350 SK |
283 | |
284 | return esp6_input_done2(skb, 0); | |
285 | } | |
286 | ||
287 | static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features) | |
288 | { | |
3dca3f38 | 289 | int len; |
383d0350 SK |
290 | int err; |
291 | int alen; | |
292 | int blksize; | |
293 | struct xfrm_offload *xo; | |
383d0350 SK |
294 | struct crypto_aead *aead; |
295 | struct esp_info esp; | |
296 | bool hw_offload = true; | |
3dca3f38 | 297 | __u32 seq; |
383d0350 SK |
298 | |
299 | esp.inplace = true; | |
300 | ||
301 | xo = xfrm_offload(skb); | |
302 | ||
303 | if (!xo) | |
304 | return -EINVAL; | |
305 | ||
fcb662de | 306 | if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) { |
383d0350 | 307 | xo->flags |= CRYPTO_FALLBACK; |
8f92e03e | 308 | hw_offload = false; |
383d0350 SK |
309 | } |
310 | ||
311 | esp.proto = xo->proto; | |
312 | ||
313 | /* skb is pure payload to encrypt */ | |
314 | ||
315 | aead = x->data; | |
316 | alen = crypto_aead_authsize(aead); | |
317 | ||
318 | esp.tfclen = 0; | |
319 | /* XXX: Add support for tfc padding here. */ | |
320 | ||
321 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
322 | esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); | |
323 | esp.plen = esp.clen - skb->len - esp.tfclen; | |
324 | esp.tailen = esp.tfclen + esp.plen + alen; | |
325 | ||
f076835a | 326 | if (!hw_offload || !skb_is_gso(skb)) { |
383d0350 SK |
327 | esp.nfrags = esp6_output_head(x, skb, &esp); |
328 | if (esp.nfrags < 0) | |
329 | return esp.nfrags; | |
330 | } | |
331 | ||
3dca3f38 SK |
332 | seq = xo->seq.low; |
333 | ||
0146dca7 SD |
334 | esp.esph = ip_esp_hdr(skb); |
335 | esp.esph->spi = x->id.spi; | |
383d0350 SK |
336 | |
337 | skb_push(skb, -skb_network_offset(skb)); | |
338 | ||
339 | if (xo->flags & XFRM_GSO_SEGMENT) { | |
0146dca7 | 340 | esp.esph->seq_no = htonl(seq); |
383d0350 | 341 | |
3dca3f38 SK |
342 | if (!skb_is_gso(skb)) |
343 | xo->seq.low++; | |
344 | else | |
345 | xo->seq.low += skb_shinfo(skb)->gso_segs; | |
383d0350 SK |
346 | } |
347 | ||
4b549ccc CL |
348 | if (xo->seq.low < seq) |
349 | xo->seq.hi++; | |
350 | ||
3dca3f38 SK |
351 | esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32)); |
352 | ||
353 | len = skb->len - sizeof(struct ipv6hdr); | |
354 | if (len > IPV6_MAXPLEN) | |
355 | len = 0; | |
356 | ||
357 | ipv6_hdr(skb)->payload_len = htons(len); | |
358 | ||
c7dbf4c0 SK |
359 | if (hw_offload) { |
360 | if (!skb_ext_add(skb, SKB_EXT_SEC_PATH)) | |
361 | return -ENOMEM; | |
362 | ||
363 | xo = xfrm_offload(skb); | |
364 | if (!xo) | |
365 | return -EINVAL; | |
366 | ||
367 | xo->flags |= XFRM_XMIT; | |
383d0350 | 368 | return 0; |
c7dbf4c0 | 369 | } |
383d0350 | 370 | |
383d0350 | 371 | err = esp6_output_tail(x, skb, &esp); |
4ff0308f | 372 | if (err) |
383d0350 SK |
373 | return err; |
374 | ||
375 | secpath_reset(skb); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
7785bba2 SK |
380 | static const struct net_offload esp6_offload = { |
381 | .callbacks = { | |
382 | .gro_receive = esp6_gro_receive, | |
7862b405 | 383 | .gso_segment = esp6_gso_segment, |
7785bba2 SK |
384 | }, |
385 | }; | |
386 | ||
383d0350 | 387 | static const struct xfrm_type_offload esp6_type_offload = { |
383d0350 SK |
388 | .owner = THIS_MODULE, |
389 | .proto = IPPROTO_ESP, | |
390 | .input_tail = esp6_input_tail, | |
391 | .xmit = esp6_xmit, | |
7862b405 | 392 | .encap = esp6_gso_encap, |
383d0350 SK |
393 | }; |
394 | ||
7785bba2 SK |
395 | static int __init esp6_offload_init(void) |
396 | { | |
383d0350 SK |
397 | if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) { |
398 | pr_info("%s: can't add xfrm type offload\n", __func__); | |
399 | return -EAGAIN; | |
400 | } | |
401 | ||
7785bba2 SK |
402 | return inet6_add_offload(&esp6_offload, IPPROTO_ESP); |
403 | } | |
404 | ||
405 | static void __exit esp6_offload_exit(void) | |
406 | { | |
4f518e80 | 407 | xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6); |
7785bba2 SK |
408 | inet6_del_offload(&esp6_offload, IPPROTO_ESP); |
409 | } | |
410 | ||
411 | module_init(esp6_offload_init); | |
412 | module_exit(esp6_offload_exit); | |
413 | MODULE_LICENSE("GPL"); | |
414 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
ffdb5211 | 415 | MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET6, XFRM_PROTO_ESP); |
67c20de3 | 416 | MODULE_DESCRIPTION("IPV6 GSO/GRO offload support"); |