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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         if (!pskb_pull(skb, offset))
 64                 return NULL;
 65 
 66         if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
 67                 goto out;
 68 
 69         xo = xfrm_offload(skb);
 70         if (!xo || !(xo->flags & CRYPTO_DONE)) {
 71                 err = secpath_set(skb);
 72                 if (err)
 73                         goto out;
 74 
 75                 if (skb->sp->len == XFRM_MAX_DEPTH)
 76                         goto out;
 77 
 78                 x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
 79                                       (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
 80                                       spi, IPPROTO_ESP, AF_INET6);
 81                 if (!x)
 82                         goto out;
 83 
 84                 skb->sp->xvec[skb->sp->len++] = x;
 85                 skb->sp->olen++;
 86 
 87                 xo = xfrm_offload(skb);
 88                 if (!xo) {
 89                         xfrm_state_put(x);
 90                         goto out;
 91                 }
 92         }
 93 
 94         xo->flags |= XFRM_GRO;
 95 
 96         nhoff = esp6_nexthdr_esp_offset(ipv6_hdr(skb), offset);
 97         if (!nhoff)
 98                 goto out;
 99 
100         IP6CB(skb)->nhoff = nhoff;
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);
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 
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);
124         int proto = iph->nexthdr;
125 
126         skb_push(skb, -skb_network_offset(skb));
127         esph = ip_esp_hdr(skb);
128         *skb_mac_header(skb) = IPPROTO_ESP;
129 
130         esph->spi = x->id.spi;
131         esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
132 
133         xo->proto = proto;
134 }
135 
136 static struct sk_buff *esp6_gso_segment(struct sk_buff *skb,
137                                         netdev_features_t features)
138 {
139         struct xfrm_state *x;
140         struct ip_esp_hdr *esph;
141         struct crypto_aead *aead;
142         netdev_features_t esp_features = features;
143         struct xfrm_offload *xo = xfrm_offload(skb);
144 
145         if (!xo)
146                 return ERR_PTR(-EINVAL);
147 
148         if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP))
149                 return ERR_PTR(-EINVAL);
150 
151         x = skb->sp->xvec[skb->sp->len - 1];
152         aead = x->data;
153         esph = ip_esp_hdr(skb);
154 
155         if (esph->spi != x->id.spi)
156                 return ERR_PTR(-EINVAL);
157 
158         if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
159                 return ERR_PTR(-EINVAL);
160 
161         __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
162 
163         skb->encap_hdr_csum = 1;
164 
165         if (!(features & NETIF_F_HW_ESP) || !x->xso.offload_handle ||
166             (x->xso.dev != skb->dev))
167                 esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
168         else if (!(features & NETIF_F_HW_ESP_TX_CSUM))
169                 esp_features = features & ~NETIF_F_CSUM_MASK;
170 
171         xo->flags |= XFRM_GSO_SEGMENT;
172 
173         return x->outer_mode->gso_segment(x, skb, esp_features);
174 }
175 
176 static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb)
177 {
178         struct crypto_aead *aead = x->data;
179         struct xfrm_offload *xo = xfrm_offload(skb);
180 
181         if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead)))
182                 return -EINVAL;
183 
184         if (!(xo->flags & CRYPTO_DONE))
185                 skb->ip_summed = CHECKSUM_NONE;
186 
187         return esp6_input_done2(skb, 0);
188 }
189 
190 static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb,  netdev_features_t features)
191 {
192         int len;
193         int err;
194         int alen;
195         int blksize;
196         struct xfrm_offload *xo;
197         struct ip_esp_hdr *esph;
198         struct crypto_aead *aead;
199         struct esp_info esp;
200         bool hw_offload = true;
201         __u32 seq;
202 
203         esp.inplace = true;
204 
205         xo = xfrm_offload(skb);
206 
207         if (!xo)
208                 return -EINVAL;
209 
210         if (!(features & NETIF_F_HW_ESP) || !x->xso.offload_handle ||
211             (x->xso.dev != skb->dev)) {
212                 xo->flags |= CRYPTO_FALLBACK;
213                 hw_offload = false;
214         }
215 
216         esp.proto = xo->proto;
217 
218         /* skb is pure payload to encrypt */
219 
220         aead = x->data;
221         alen = crypto_aead_authsize(aead);
222 
223         esp.tfclen = 0;
224         /* XXX: Add support for tfc padding here. */
225 
226         blksize = ALIGN(crypto_aead_blocksize(aead), 4);
227         esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
228         esp.plen = esp.clen - skb->len - esp.tfclen;
229         esp.tailen = esp.tfclen + esp.plen + alen;
230 
231         if (!hw_offload || (hw_offload && !skb_is_gso(skb))) {
232                 esp.nfrags = esp6_output_head(x, skb, &esp);
233                 if (esp.nfrags < 0)
234                         return esp.nfrags;
235         }
236 
237         seq = xo->seq.low;
238 
239         esph = ip_esp_hdr(skb);
240         esph->spi = x->id.spi;
241 
242         skb_push(skb, -skb_network_offset(skb));
243 
244         if (xo->flags & XFRM_GSO_SEGMENT) {
245                 esph->seq_no = htonl(seq);
246 
247                 if (!skb_is_gso(skb))
248                         xo->seq.low++;
249                 else
250                         xo->seq.low += skb_shinfo(skb)->gso_segs;
251         }
252 
253         esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32));
254 
255         len = skb->len - sizeof(struct ipv6hdr);
256         if (len > IPV6_MAXPLEN)
257                 len = 0;
258 
259         ipv6_hdr(skb)->payload_len = htons(len);
260 
261         if (hw_offload)
262                 return 0;
263 
264         err = esp6_output_tail(x, skb, &esp);
265         if (err)
266                 return err;
267 
268         secpath_reset(skb);
269 
270         return 0;
271 }
272 
273 static const struct net_offload esp6_offload = {
274         .callbacks = {
275                 .gro_receive = esp6_gro_receive,
276                 .gso_segment = esp6_gso_segment,
277         },
278 };
279 
280 static const struct xfrm_type_offload esp6_type_offload = {
281         .description    = "ESP6 OFFLOAD",
282         .owner          = THIS_MODULE,
283         .proto          = IPPROTO_ESP,
284         .input_tail     = esp6_input_tail,
285         .xmit           = esp6_xmit,
286         .encap          = esp6_gso_encap,
287 };
288 
289 static int __init esp6_offload_init(void)
290 {
291         if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) {
292                 pr_info("%s: can't add xfrm type offload\n", __func__);
293                 return -EAGAIN;
294         }
295 
296         return inet6_add_offload(&esp6_offload, IPPROTO_ESP);
297 }
298 
299 static void __exit esp6_offload_exit(void)
300 {
301         if (xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6) < 0)
302                 pr_info("%s: can't remove xfrm type offload\n", __func__);
303 
304         inet6_del_offload(&esp6_offload, IPPROTO_ESP);
305 }
306 
307 module_init(esp6_offload_init);
308 module_exit(esp6_offload_exit);
309 MODULE_LICENSE("GPL");
310 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
311 MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET6, XFRM_PROTO_ESP);
312 

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