Commit | Line | Data |
---|---|---|
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> |
d457a0e3 | 20 | #include <net/gso.h> |
7785bba2 SK |
21 | #include <net/ip.h> |
22 | #include <net/xfrm.h> | |
23 | #include <net/esp.h> | |
24 | #include <linux/scatterlist.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <net/ip6_route.h> | |
29 | #include <net/ipv6.h> | |
30 | #include <linux/icmpv6.h> | |
31 | ||
ca3a1b85 YK |
32 | static __u16 esp6_nexthdr_esp_offset(struct ipv6hdr *ipv6_hdr, int nhlen) |
33 | { | |
34 | int off = sizeof(struct ipv6hdr); | |
35 | struct ipv6_opt_hdr *exthdr; | |
36 | ||
221ddb72 SK |
37 | /* ESP or ESPINUDP */ |
38 | if (likely(ipv6_hdr->nexthdr == NEXTHDR_ESP || | |
39 | ipv6_hdr->nexthdr == NEXTHDR_UDP)) | |
ca3a1b85 YK |
40 | return offsetof(struct ipv6hdr, nexthdr); |
41 | ||
42 | while (off < nhlen) { | |
43 | exthdr = (void *)ipv6_hdr + off; | |
44 | if (exthdr->nexthdr == NEXTHDR_ESP) | |
45 | return off; | |
46 | ||
47 | off += ipv6_optlen(exthdr); | |
48 | } | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
d4546c25 DM |
53 | static struct sk_buff *esp6_gro_receive(struct list_head *head, |
54 | struct sk_buff *skb) | |
7785bba2 SK |
55 | { |
56 | int offset = skb_gro_offset(skb); | |
57 | struct xfrm_offload *xo; | |
58 | struct xfrm_state *x; | |
221ddb72 | 59 | int encap_type = 0; |
7785bba2 SK |
60 | __be32 seq; |
61 | __be32 spi; | |
ca3a1b85 | 62 | int nhoff; |
7785bba2 | 63 | |
221ddb72 SK |
64 | if (NAPI_GRO_CB(skb)->proto == IPPROTO_UDP) |
65 | encap_type = UDP_ENCAP_ESPINUDP; | |
66 | ||
374d1b5a SK |
67 | if (!pskb_pull(skb, offset)) |
68 | return NULL; | |
7785bba2 | 69 | |
e91001ba | 70 | if (xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq) != 0) |
7785bba2 SK |
71 | goto out; |
72 | ||
bcd1f8a4 SK |
73 | xo = xfrm_offload(skb); |
74 | if (!xo || !(xo->flags & CRYPTO_DONE)) { | |
0ca64da1 FW |
75 | struct sec_path *sp = secpath_set(skb); |
76 | ||
77 | if (!sp) | |
bcd1f8a4 | 78 | goto out; |
7785bba2 | 79 | |
0ca64da1 | 80 | if (sp->len == XFRM_MAX_DEPTH) |
6ed69184 | 81 | goto out_reset; |
7785bba2 | 82 | |
bcd1f8a4 SK |
83 | x = xfrm_state_lookup(dev_net(skb->dev), skb->mark, |
84 | (xfrm_address_t *)&ipv6_hdr(skb)->daddr, | |
85 | spi, IPPROTO_ESP, AF_INET6); | |
86 | if (!x) | |
6ed69184 | 87 | goto out_reset; |
7785bba2 | 88 | |
4e4362d2 UW |
89 | skb->mark = xfrm_smark_get(skb->mark, x); |
90 | ||
0ca64da1 FW |
91 | sp->xvec[sp->len++] = x; |
92 | sp->olen++; | |
7785bba2 | 93 | |
bcd1f8a4 | 94 | xo = xfrm_offload(skb); |
db87668a | 95 | if (!xo) |
6ed69184 | 96 | goto out_reset; |
7785bba2 | 97 | } |
bcd1f8a4 | 98 | |
7785bba2 SK |
99 | xo->flags |= XFRM_GRO; |
100 | ||
ca3a1b85 YK |
101 | nhoff = esp6_nexthdr_esp_offset(ipv6_hdr(skb), offset); |
102 | if (!nhoff) | |
103 | goto out; | |
104 | ||
105 | IP6CB(skb)->nhoff = nhoff; | |
7785bba2 SK |
106 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL; |
107 | XFRM_SPI_SKB_CB(skb)->family = AF_INET6; | |
108 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); | |
109 | XFRM_SPI_SKB_CB(skb)->seq = seq; | |
110 | ||
111 | /* We don't need to handle errors from xfrm_input, it does all | |
112 | * the error handling and frees the resources on error. */ | |
221ddb72 | 113 | xfrm_input(skb, IPPROTO_ESP, spi, encap_type); |
7785bba2 SK |
114 | |
115 | return ERR_PTR(-EINPROGRESS); | |
6ed69184 MJ |
116 | out_reset: |
117 | secpath_reset(skb); | |
7785bba2 SK |
118 | out: |
119 | skb_push(skb, offset); | |
120 | NAPI_GRO_CB(skb)->same_flow = 0; | |
121 | NAPI_GRO_CB(skb)->flush = 1; | |
122 | ||
123 | return NULL; | |
124 | } | |
125 | ||
7862b405 SK |
126 | static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb) |
127 | { | |
128 | struct ip_esp_hdr *esph; | |
129 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
130 | struct xfrm_offload *xo = xfrm_offload(skb); | |
3c96ec56 | 131 | u8 proto = iph->nexthdr; |
7862b405 SK |
132 | |
133 | skb_push(skb, -skb_network_offset(skb)); | |
3c96ec56 XL |
134 | |
135 | if (x->outer_mode.encap == XFRM_MODE_TRANSPORT) { | |
136 | __be16 frag; | |
137 | ||
138 | ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto, &frag); | |
139 | } | |
140 | ||
7862b405 SK |
141 | esph = ip_esp_hdr(skb); |
142 | *skb_mac_header(skb) = IPPROTO_ESP; | |
143 | ||
144 | esph->spi = x->id.spi; | |
145 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); | |
146 | ||
147 | xo->proto = proto; | |
148 | } | |
149 | ||
7613b92b FW |
150 | static struct sk_buff *xfrm6_tunnel_gso_segment(struct xfrm_state *x, |
151 | struct sk_buff *skb, | |
152 | netdev_features_t features) | |
153 | { | |
26dbd66e SD |
154 | __be16 type = x->inner_mode.family == AF_INET ? htons(ETH_P_IP) |
155 | : htons(ETH_P_IPV6); | |
156 | ||
157 | return skb_eth_gso_segment(skb, features, type); | |
7613b92b FW |
158 | } |
159 | ||
160 | static struct sk_buff *xfrm6_transport_gso_segment(struct xfrm_state *x, | |
161 | struct sk_buff *skb, | |
162 | netdev_features_t features) | |
163 | { | |
164 | const struct net_offload *ops; | |
165 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
166 | struct xfrm_offload *xo = xfrm_offload(skb); | |
167 | ||
168 | skb->transport_header += x->props.header_len; | |
169 | ops = rcu_dereference(inet6_offloads[xo->proto]); | |
170 | if (likely(ops && ops->callbacks.gso_segment)) | |
171 | segs = ops->callbacks.gso_segment(skb, features); | |
172 | ||
173 | return segs; | |
174 | } | |
175 | ||
7f9e40eb XL |
176 | static struct sk_buff *xfrm6_beet_gso_segment(struct xfrm_state *x, |
177 | struct sk_buff *skb, | |
178 | netdev_features_t features) | |
179 | { | |
180 | struct xfrm_offload *xo = xfrm_offload(skb); | |
181 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
182 | const struct net_offload *ops; | |
25a44ae9 | 183 | u8 proto = xo->proto; |
7f9e40eb XL |
184 | |
185 | skb->transport_header += x->props.header_len; | |
186 | ||
7f9e40eb XL |
187 | if (x->sel.family != AF_INET6) { |
188 | skb->transport_header -= | |
189 | (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); | |
190 | ||
56b1b7c6 XL |
191 | if (proto == IPPROTO_BEETPH) { |
192 | struct ip_beet_phdr *ph = | |
193 | (struct ip_beet_phdr *)skb->data; | |
194 | ||
195 | skb->transport_header += ph->hdrlen * 8; | |
196 | proto = ph->nexthdr; | |
197 | } else { | |
198 | skb->transport_header -= IPV4_BEET_PHMAXLEN; | |
199 | } | |
7f9e40eb | 200 | |
7f9e40eb XL |
201 | if (proto == IPPROTO_TCP) |
202 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6; | |
56b1b7c6 | 203 | } else { |
25a44ae9 XL |
204 | __be16 frag; |
205 | ||
206 | skb->transport_header += | |
207 | ipv6_skip_exthdr(skb, 0, &proto, &frag); | |
7f9e40eb XL |
208 | } |
209 | ||
053c8fdf SK |
210 | if (proto == IPPROTO_IPIP) |
211 | skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6; | |
212 | ||
7f9e40eb XL |
213 | __skb_pull(skb, skb_transport_offset(skb)); |
214 | ops = rcu_dereference(inet6_offloads[proto]); | |
215 | if (likely(ops && ops->callbacks.gso_segment)) | |
216 | segs = ops->callbacks.gso_segment(skb, features); | |
217 | ||
218 | return segs; | |
219 | } | |
220 | ||
7613b92b FW |
221 | static struct sk_buff *xfrm6_outer_mode_gso_segment(struct xfrm_state *x, |
222 | struct sk_buff *skb, | |
223 | netdev_features_t features) | |
224 | { | |
c9500d7b | 225 | switch (x->outer_mode.encap) { |
7613b92b FW |
226 | case XFRM_MODE_TUNNEL: |
227 | return xfrm6_tunnel_gso_segment(x, skb, features); | |
228 | case XFRM_MODE_TRANSPORT: | |
229 | return xfrm6_transport_gso_segment(x, skb, features); | |
7f9e40eb XL |
230 | case XFRM_MODE_BEET: |
231 | return xfrm6_beet_gso_segment(x, skb, features); | |
7613b92b FW |
232 | } |
233 | ||
234 | return ERR_PTR(-EOPNOTSUPP); | |
235 | } | |
236 | ||
7862b405 SK |
237 | static struct sk_buff *esp6_gso_segment(struct sk_buff *skb, |
238 | netdev_features_t features) | |
239 | { | |
7862b405 SK |
240 | struct xfrm_state *x; |
241 | struct ip_esp_hdr *esph; | |
242 | struct crypto_aead *aead; | |
7862b405 SK |
243 | netdev_features_t esp_features = features; |
244 | struct xfrm_offload *xo = xfrm_offload(skb); | |
2294be0f | 245 | struct sec_path *sp; |
7862b405 | 246 | |
ffa6f571 | 247 | if (!xo) |
3dca3f38 | 248 | return ERR_PTR(-EINVAL); |
7862b405 | 249 | |
121d57af | 250 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP)) |
5ca11440 | 251 | return ERR_PTR(-EINVAL); |
7862b405 | 252 | |
2294be0f FW |
253 | sp = skb_sec_path(skb); |
254 | x = sp->xvec[sp->len - 1]; | |
7862b405 SK |
255 | aead = x->data; |
256 | esph = ip_esp_hdr(skb); | |
257 | ||
258 | if (esph->spi != x->id.spi) | |
3dca3f38 | 259 | return ERR_PTR(-EINVAL); |
7862b405 SK |
260 | |
261 | if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) | |
3dca3f38 | 262 | return ERR_PTR(-EINVAL); |
7862b405 SK |
263 | |
264 | __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)); | |
265 | ||
266 | skb->encap_hdr_csum = 1; | |
267 | ||
fcb662de | 268 | if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) |
154deab6 XL |
269 | esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK | |
270 | NETIF_F_SCTP_CRC); | |
5211fcfb | 271 | else if (!(features & NETIF_F_HW_ESP_TX_CSUM)) |
154deab6 XL |
272 | esp_features = features & ~(NETIF_F_CSUM_MASK | |
273 | NETIF_F_SCTP_CRC); | |
7862b405 | 274 | |
3dca3f38 | 275 | xo->flags |= XFRM_GSO_SEGMENT; |
7862b405 | 276 | |
7613b92b | 277 | return xfrm6_outer_mode_gso_segment(x, skb, esp_features); |
7862b405 SK |
278 | } |
279 | ||
383d0350 SK |
280 | static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb) |
281 | { | |
282 | struct crypto_aead *aead = x->data; | |
e51a6472 | 283 | struct xfrm_offload *xo = xfrm_offload(skb); |
383d0350 SK |
284 | |
285 | if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead))) | |
286 | return -EINVAL; | |
287 | ||
e51a6472 IT |
288 | if (!(xo->flags & CRYPTO_DONE)) |
289 | skb->ip_summed = CHECKSUM_NONE; | |
383d0350 SK |
290 | |
291 | return esp6_input_done2(skb, 0); | |
292 | } | |
293 | ||
294 | static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features) | |
295 | { | |
3dca3f38 | 296 | int len; |
383d0350 SK |
297 | int err; |
298 | int alen; | |
299 | int blksize; | |
300 | struct xfrm_offload *xo; | |
383d0350 SK |
301 | struct crypto_aead *aead; |
302 | struct esp_info esp; | |
303 | bool hw_offload = true; | |
3dca3f38 | 304 | __u32 seq; |
383d0350 SK |
305 | |
306 | esp.inplace = true; | |
307 | ||
308 | xo = xfrm_offload(skb); | |
309 | ||
310 | if (!xo) | |
311 | return -EINVAL; | |
312 | ||
fcb662de | 313 | if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) { |
383d0350 | 314 | xo->flags |= CRYPTO_FALLBACK; |
8f92e03e | 315 | hw_offload = false; |
383d0350 SK |
316 | } |
317 | ||
318 | esp.proto = xo->proto; | |
319 | ||
320 | /* skb is pure payload to encrypt */ | |
321 | ||
322 | aead = x->data; | |
323 | alen = crypto_aead_authsize(aead); | |
324 | ||
325 | esp.tfclen = 0; | |
326 | /* XXX: Add support for tfc padding here. */ | |
327 | ||
328 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
329 | esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); | |
330 | esp.plen = esp.clen - skb->len - esp.tfclen; | |
331 | esp.tailen = esp.tfclen + esp.plen + alen; | |
332 | ||
f076835a | 333 | if (!hw_offload || !skb_is_gso(skb)) { |
383d0350 SK |
334 | esp.nfrags = esp6_output_head(x, skb, &esp); |
335 | if (esp.nfrags < 0) | |
336 | return esp.nfrags; | |
337 | } | |
338 | ||
3dca3f38 SK |
339 | seq = xo->seq.low; |
340 | ||
0146dca7 SD |
341 | esp.esph = ip_esp_hdr(skb); |
342 | esp.esph->spi = x->id.spi; | |
383d0350 SK |
343 | |
344 | skb_push(skb, -skb_network_offset(skb)); | |
345 | ||
346 | if (xo->flags & XFRM_GSO_SEGMENT) { | |
0146dca7 | 347 | esp.esph->seq_no = htonl(seq); |
383d0350 | 348 | |
3dca3f38 SK |
349 | if (!skb_is_gso(skb)) |
350 | xo->seq.low++; | |
351 | else | |
352 | xo->seq.low += skb_shinfo(skb)->gso_segs; | |
383d0350 SK |
353 | } |
354 | ||
4b549ccc CL |
355 | if (xo->seq.low < seq) |
356 | xo->seq.hi++; | |
357 | ||
3dca3f38 SK |
358 | esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32)); |
359 | ||
360 | len = skb->len - sizeof(struct ipv6hdr); | |
361 | if (len > IPV6_MAXPLEN) | |
362 | len = 0; | |
363 | ||
364 | ipv6_hdr(skb)->payload_len = htons(len); | |
365 | ||
c7dbf4c0 SK |
366 | if (hw_offload) { |
367 | if (!skb_ext_add(skb, SKB_EXT_SEC_PATH)) | |
368 | return -ENOMEM; | |
369 | ||
370 | xo = xfrm_offload(skb); | |
371 | if (!xo) | |
372 | return -EINVAL; | |
373 | ||
374 | xo->flags |= XFRM_XMIT; | |
383d0350 | 375 | return 0; |
c7dbf4c0 | 376 | } |
383d0350 | 377 | |
383d0350 | 378 | err = esp6_output_tail(x, skb, &esp); |
4ff0308f | 379 | if (err) |
383d0350 SK |
380 | return err; |
381 | ||
382 | secpath_reset(skb); | |
383 | ||
f015b900 SAS |
384 | if (skb_needs_linearize(skb, skb->dev->features) && |
385 | __skb_linearize(skb)) | |
386 | return -ENOMEM; | |
383d0350 SK |
387 | return 0; |
388 | } | |
389 | ||
7785bba2 SK |
390 | static const struct net_offload esp6_offload = { |
391 | .callbacks = { | |
392 | .gro_receive = esp6_gro_receive, | |
7862b405 | 393 | .gso_segment = esp6_gso_segment, |
7785bba2 SK |
394 | }, |
395 | }; | |
396 | ||
383d0350 | 397 | static const struct xfrm_type_offload esp6_type_offload = { |
383d0350 SK |
398 | .owner = THIS_MODULE, |
399 | .proto = IPPROTO_ESP, | |
400 | .input_tail = esp6_input_tail, | |
401 | .xmit = esp6_xmit, | |
7862b405 | 402 | .encap = esp6_gso_encap, |
383d0350 SK |
403 | }; |
404 | ||
7785bba2 SK |
405 | static int __init esp6_offload_init(void) |
406 | { | |
383d0350 SK |
407 | if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) { |
408 | pr_info("%s: can't add xfrm type offload\n", __func__); | |
409 | return -EAGAIN; | |
410 | } | |
411 | ||
7785bba2 SK |
412 | return inet6_add_offload(&esp6_offload, IPPROTO_ESP); |
413 | } | |
414 | ||
415 | static void __exit esp6_offload_exit(void) | |
416 | { | |
4f518e80 | 417 | xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6); |
7785bba2 SK |
418 | inet6_del_offload(&esp6_offload, IPPROTO_ESP); |
419 | } | |
420 | ||
421 | module_init(esp6_offload_init); | |
422 | module_exit(esp6_offload_exit); | |
423 | MODULE_LICENSE("GPL"); | |
424 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
ffdb5211 | 425 | MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET6, XFRM_PROTO_ESP); |
67c20de3 | 426 | MODULE_DESCRIPTION("IPV6 GSO/GRO offload support"); |