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Linux/net/ipv6/esp6_offload.c

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  1 /*
  2  * IPV6 GSO/GRO offload support
  3  * Linux INET implementation
  4  *
  5  * Copyright (C) 2016 secunet Security Networks AG
  6  * Author: Steffen Klassert <steffen.klassert@secunet.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms and conditions of the GNU General Public License,
 10  * version 2, as published by the Free Software Foundation.
 11  *
 12  * ESP GRO support
 13  */
 14 
 15 #include <linux/skbuff.h>
 16 #include <linux/init.h>
 17 #include <net/protocol.h>
 18 #include <crypto/aead.h>
 19 #include <crypto/authenc.h>
 20 #include <linux/err.h>
 21 #include <linux/module.h>
 22 #include <net/ip.h>
 23 #include <net/xfrm.h>
 24 #include <net/esp.h>
 25 #include <linux/scatterlist.h>
 26 #include <linux/kernel.h>
 27 #include <linux/slab.h>
 28 #include <linux/spinlock.h>
 29 #include <net/ip6_route.h>
 30 #include <net/ipv6.h>
 31 #include <linux/icmpv6.h>
 32 
 33 static __u16 esp6_nexthdr_esp_offset(struct ipv6hdr *ipv6_hdr, int nhlen)
 34 {
 35         int off = sizeof(struct ipv6hdr);
 36         struct ipv6_opt_hdr *exthdr;
 37 
 38         if (likely(ipv6_hdr->nexthdr == NEXTHDR_ESP))
 39                 return offsetof(struct ipv6hdr, nexthdr);
 40 
 41         while (off < nhlen) {
 42                 exthdr = (void *)ipv6_hdr + off;
 43                 if (exthdr->nexthdr == NEXTHDR_ESP)
 44                         return off;
 45 
 46                 off += ipv6_optlen(exthdr);
 47         }
 48 
 49         return 0;
 50 }
 51 
 52 static struct sk_buff **esp6_gro_receive(struct sk_buff **head,
 53                                          struct sk_buff *skb)
 54 {
 55         int offset = skb_gro_offset(skb);
 56         struct xfrm_offload *xo;
 57         struct xfrm_state *x;
 58         __be32 seq;
 59         __be32 spi;
 60         int nhoff;
 61         int err;
 62 
 63         skb_pull(skb, offset);
 64 
 65         if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
 66                 goto out;
 67 
 68         xo = xfrm_offload(skb);
 69         if (!xo || !(xo->flags & CRYPTO_DONE)) {
 70                 err = secpath_set(skb);
 71                 if (err)
 72                         goto out;
 73 
 74                 if (skb->sp->len == XFRM_MAX_DEPTH)
 75                         goto out;
 76 
 77                 x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
 78                                       (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
 79                                       spi, IPPROTO_ESP, AF_INET6);
 80                 if (!x)
 81                         goto out;
 82 
 83                 skb->sp->xvec[skb->sp->len++] = x;
 84                 skb->sp->olen++;
 85 
 86                 xo = xfrm_offload(skb);
 87                 if (!xo) {
 88                         xfrm_state_put(x);
 89                         goto out;
 90                 }
 91         }
 92 
 93         xo->flags |= XFRM_GRO;
 94 
 95         nhoff = esp6_nexthdr_esp_offset(ipv6_hdr(skb), offset);
 96         if (!nhoff)
 97                 goto out;
 98 
 99         IP6CB(skb)->nhoff = nhoff;
100         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
101         XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
102         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
103         XFRM_SPI_SKB_CB(skb)->seq = seq;
104 
105         /* We don't need to handle errors from xfrm_input, it does all
106          * the error handling and frees the resources on error. */
107         xfrm_input(skb, IPPROTO_ESP, spi, -2);
108 
109         return ERR_PTR(-EINPROGRESS);
110 out:
111         skb_push(skb, offset);
112         NAPI_GRO_CB(skb)->same_flow = 0;
113         NAPI_GRO_CB(skb)->flush = 1;
114 
115         return NULL;
116 }
117 
118 static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
119 {
120         struct ip_esp_hdr *esph;
121         struct ipv6hdr *iph = ipv6_hdr(skb);
122         struct xfrm_offload *xo = xfrm_offload(skb);
123         int proto = iph->nexthdr;
124 
125         skb_push(skb, -skb_network_offset(skb));
126         esph = ip_esp_hdr(skb);
127         *skb_mac_header(skb) = IPPROTO_ESP;
128 
129         esph->spi = x->id.spi;
130         esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
131 
132         xo->proto = proto;
133 }
134 
135 static struct sk_buff *esp6_gso_segment(struct sk_buff *skb,
136                                         netdev_features_t features)
137 {
138         __u32 seq;
139         int err = 0;
140         struct sk_buff *skb2;
141         struct xfrm_state *x;
142         struct ip_esp_hdr *esph;
143         struct crypto_aead *aead;
144         struct sk_buff *segs = ERR_PTR(-EINVAL);
145         netdev_features_t esp_features = features;
146         struct xfrm_offload *xo = xfrm_offload(skb);
147 
148         if (!xo)
149                 goto out;
150 
151         seq = xo->seq.low;
152 
153         x = skb->sp->xvec[skb->sp->len - 1];
154         aead = x->data;
155         esph = ip_esp_hdr(skb);
156 
157         if (esph->spi != x->id.spi)
158                 goto out;
159 
160         if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
161                 goto out;
162 
163         __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
164 
165         skb->encap_hdr_csum = 1;
166 
167         if (!(features & NETIF_F_HW_ESP))
168                 esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
169 
170         segs = x->outer_mode->gso_segment(x, skb, esp_features);
171         if (IS_ERR_OR_NULL(segs))
172                 goto out;
173 
174         __skb_pull(skb, skb->data - skb_mac_header(skb));
175 
176         skb2 = segs;
177         do {
178                 struct sk_buff *nskb = skb2->next;
179 
180                 xo = xfrm_offload(skb2);
181                 xo->flags |= XFRM_GSO_SEGMENT;
182                 xo->seq.low = seq;
183                 xo->seq.hi = xfrm_replay_seqhi(x, seq);
184 
185                 if(!(features & NETIF_F_HW_ESP))
186                         xo->flags |= CRYPTO_FALLBACK;
187 
188                 x->outer_mode->xmit(x, skb2);
189 
190                 err = x->type_offload->xmit(x, skb2, esp_features);
191                 if (err) {
192                         kfree_skb_list(segs);
193                         return ERR_PTR(err);
194                 }
195 
196                 if (!skb_is_gso(skb2))
197                         seq++;
198                 else
199                         seq += skb_shinfo(skb2)->gso_segs;
200 
201                 skb_push(skb2, skb2->mac_len);
202                 skb2 = nskb;
203         } while (skb2);
204 
205 out:
206         return segs;
207 }
208 
209 static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb)
210 {
211         struct crypto_aead *aead = x->data;
212 
213         if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead)))
214                 return -EINVAL;
215 
216         skb->ip_summed = CHECKSUM_NONE;
217 
218         return esp6_input_done2(skb, 0);
219 }
220 
221 static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb,  netdev_features_t features)
222 {
223         int err;
224         int alen;
225         int blksize;
226         struct xfrm_offload *xo;
227         struct ip_esp_hdr *esph;
228         struct crypto_aead *aead;
229         struct esp_info esp;
230         bool hw_offload = true;
231 
232         esp.inplace = true;
233 
234         xo = xfrm_offload(skb);
235 
236         if (!xo)
237                 return -EINVAL;
238 
239         if (!(features & NETIF_F_HW_ESP) || !x->xso.offload_handle ||
240             (x->xso.dev != skb->dev)) {
241                 xo->flags |= CRYPTO_FALLBACK;
242                 hw_offload = false;
243         }
244 
245         esp.proto = xo->proto;
246 
247         /* skb is pure payload to encrypt */
248 
249         aead = x->data;
250         alen = crypto_aead_authsize(aead);
251 
252         esp.tfclen = 0;
253         /* XXX: Add support for tfc padding here. */
254 
255         blksize = ALIGN(crypto_aead_blocksize(aead), 4);
256         esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
257         esp.plen = esp.clen - skb->len - esp.tfclen;
258         esp.tailen = esp.tfclen + esp.plen + alen;
259 
260         if (!hw_offload || (hw_offload && !skb_is_gso(skb))) {
261                 esp.nfrags = esp6_output_head(x, skb, &esp);
262                 if (esp.nfrags < 0)
263                         return esp.nfrags;
264         }
265 
266         esph = ip_esp_hdr(skb);
267         esph->spi = x->id.spi;
268 
269         skb_push(skb, -skb_network_offset(skb));
270 
271         if (xo->flags & XFRM_GSO_SEGMENT) {
272                 esph->seq_no = htonl(xo->seq.low);
273         } else {
274                 int len;
275 
276                 len = skb->len - sizeof(struct ipv6hdr);
277                 if (len > IPV6_MAXPLEN)
278                         len = 0;
279 
280                 ipv6_hdr(skb)->payload_len = htons(len);
281         }
282 
283         if (hw_offload)
284                 return 0;
285 
286         esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32));
287 
288         err = esp6_output_tail(x, skb, &esp);
289         if (err)
290                 return err;
291 
292         secpath_reset(skb);
293 
294         return 0;
295 }
296 
297 static const struct net_offload esp6_offload = {
298         .callbacks = {
299                 .gro_receive = esp6_gro_receive,
300                 .gso_segment = esp6_gso_segment,
301         },
302 };
303 
304 static const struct xfrm_type_offload esp6_type_offload = {
305         .description    = "ESP6 OFFLOAD",
306         .owner          = THIS_MODULE,
307         .proto          = IPPROTO_ESP,
308         .input_tail     = esp6_input_tail,
309         .xmit           = esp6_xmit,
310         .encap          = esp6_gso_encap,
311 };
312 
313 static int __init esp6_offload_init(void)
314 {
315         if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) {
316                 pr_info("%s: can't add xfrm type offload\n", __func__);
317                 return -EAGAIN;
318         }
319 
320         return inet6_add_offload(&esp6_offload, IPPROTO_ESP);
321 }
322 
323 static void __exit esp6_offload_exit(void)
324 {
325         if (xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6) < 0)
326                 pr_info("%s: can't remove xfrm type offload\n", __func__);
327 
328         inet6_del_offload(&esp6_offload, IPPROTO_ESP);
329 }
330 
331 module_init(esp6_offload_init);
332 module_exit(esp6_offload_exit);
333 MODULE_LICENSE("GPL");
334 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
335 

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