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Linux/net/ipv4/esp4_offload.c

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  1 /*
  2  * IPV4 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/udp.h>
 30 
 31 static struct sk_buff **esp4_gro_receive(struct sk_buff **head,
 32                                          struct sk_buff *skb)
 33 {
 34         int offset = skb_gro_offset(skb);
 35         struct xfrm_offload *xo;
 36         struct xfrm_state *x;
 37         __be32 seq;
 38         __be32 spi;
 39         int err;
 40 
 41         skb_pull(skb, offset);
 42 
 43         if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
 44                 goto out;
 45 
 46         xo = xfrm_offload(skb);
 47         if (!xo || !(xo->flags & CRYPTO_DONE)) {
 48                 err = secpath_set(skb);
 49                 if (err)
 50                         goto out;
 51 
 52                 if (skb->sp->len == XFRM_MAX_DEPTH)
 53                         goto out;
 54 
 55                 x = xfrm_state_lookup(dev_net(skb->dev), skb->mark,
 56                                       (xfrm_address_t *)&ip_hdr(skb)->daddr,
 57                                       spi, IPPROTO_ESP, AF_INET);
 58                 if (!x)
 59                         goto out;
 60 
 61                 skb->sp->xvec[skb->sp->len++] = x;
 62                 skb->sp->olen++;
 63 
 64                 xo = xfrm_offload(skb);
 65                 if (!xo) {
 66                         xfrm_state_put(x);
 67                         goto out;
 68                 }
 69         }
 70 
 71         xo->flags |= XFRM_GRO;
 72 
 73         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
 74         XFRM_SPI_SKB_CB(skb)->family = AF_INET;
 75         XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
 76         XFRM_SPI_SKB_CB(skb)->seq = seq;
 77 
 78         /* We don't need to handle errors from xfrm_input, it does all
 79          * the error handling and frees the resources on error. */
 80         xfrm_input(skb, IPPROTO_ESP, spi, -2);
 81 
 82         return ERR_PTR(-EINPROGRESS);
 83 out:
 84         skb_push(skb, offset);
 85         NAPI_GRO_CB(skb)->same_flow = 0;
 86         NAPI_GRO_CB(skb)->flush = 1;
 87 
 88         return NULL;
 89 }
 90 
 91 static void esp4_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
 92 {
 93         struct ip_esp_hdr *esph;
 94         struct iphdr *iph = ip_hdr(skb);
 95         struct xfrm_offload *xo = xfrm_offload(skb);
 96         int proto = iph->protocol;
 97 
 98         skb_push(skb, -skb_network_offset(skb));
 99         esph = ip_esp_hdr(skb);
100         *skb_mac_header(skb) = IPPROTO_ESP;
101 
102         esph->spi = x->id.spi;
103         esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
104 
105         xo->proto = proto;
106 }
107 
108 static struct sk_buff *esp4_gso_segment(struct sk_buff *skb,
109                                         netdev_features_t features)
110 {
111         __u32 seq;
112         int err = 0;
113         struct sk_buff *skb2;
114         struct xfrm_state *x;
115         struct ip_esp_hdr *esph;
116         struct crypto_aead *aead;
117         struct sk_buff *segs = ERR_PTR(-EINVAL);
118         netdev_features_t esp_features = features;
119         struct xfrm_offload *xo = xfrm_offload(skb);
120 
121         if (!xo)
122                 goto out;
123 
124         seq = xo->seq.low;
125 
126         x = skb->sp->xvec[skb->sp->len - 1];
127         aead = x->data;
128         esph = ip_esp_hdr(skb);
129 
130         if (esph->spi != x->id.spi)
131                 goto out;
132 
133         if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
134                 goto out;
135 
136         __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead));
137 
138         skb->encap_hdr_csum = 1;
139 
140         if (!(features & NETIF_F_HW_ESP))
141                 esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
142 
143         segs = x->outer_mode->gso_segment(x, skb, esp_features);
144         if (IS_ERR_OR_NULL(segs))
145                 goto out;
146 
147         __skb_pull(skb, skb->data - skb_mac_header(skb));
148 
149         skb2 = segs;
150         do {
151                 struct sk_buff *nskb = skb2->next;
152 
153                 xo = xfrm_offload(skb2);
154                 xo->flags |= XFRM_GSO_SEGMENT;
155                 xo->seq.low = seq;
156                 xo->seq.hi = xfrm_replay_seqhi(x, seq);
157 
158                 if(!(features & NETIF_F_HW_ESP))
159                         xo->flags |= CRYPTO_FALLBACK;
160 
161                 x->outer_mode->xmit(x, skb2);
162 
163                 err = x->type_offload->xmit(x, skb2, esp_features);
164                 if (err) {
165                         kfree_skb_list(segs);
166                         return ERR_PTR(err);
167                 }
168 
169                 if (!skb_is_gso(skb2))
170                         seq++;
171                 else
172                         seq += skb_shinfo(skb2)->gso_segs;
173 
174                 skb_push(skb2, skb2->mac_len);
175                 skb2 = nskb;
176         } while (skb2);
177 
178 out:
179         return segs;
180 }
181 
182 static int esp_input_tail(struct xfrm_state *x, struct sk_buff *skb)
183 {
184         struct crypto_aead *aead = x->data;
185 
186         if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead)))
187                 return -EINVAL;
188 
189         skb->ip_summed = CHECKSUM_NONE;
190 
191         return esp_input_done2(skb, 0);
192 }
193 
194 static int esp_xmit(struct xfrm_state *x, struct sk_buff *skb,  netdev_features_t features)
195 {
196         int err;
197         int alen;
198         int blksize;
199         struct xfrm_offload *xo;
200         struct ip_esp_hdr *esph;
201         struct crypto_aead *aead;
202         struct esp_info esp;
203         bool hw_offload = true;
204 
205         esp.inplace = true;
206 
207         xo = xfrm_offload(skb);
208 
209         if (!xo)
210                 return -EINVAL;
211 
212         if (!(features & NETIF_F_HW_ESP) || !x->xso.offload_handle ||
213             (x->xso.dev != skb->dev)) {
214                 xo->flags |= CRYPTO_FALLBACK;
215                 hw_offload = false;
216         }
217 
218         esp.proto = xo->proto;
219 
220         /* skb is pure payload to encrypt */
221 
222         aead = x->data;
223         alen = crypto_aead_authsize(aead);
224 
225         esp.tfclen = 0;
226         /* XXX: Add support for tfc padding here. */
227 
228         blksize = ALIGN(crypto_aead_blocksize(aead), 4);
229         esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
230         esp.plen = esp.clen - skb->len - esp.tfclen;
231         esp.tailen = esp.tfclen + esp.plen + alen;
232 
233         esp.esph = ip_esp_hdr(skb);
234 
235 
236         if (!hw_offload || (hw_offload && !skb_is_gso(skb))) {
237                 esp.nfrags = esp_output_head(x, skb, &esp);
238                 if (esp.nfrags < 0)
239                         return esp.nfrags;
240         }
241 
242         esph = esp.esph;
243         esph->spi = x->id.spi;
244 
245         skb_push(skb, -skb_network_offset(skb));
246 
247         if (xo->flags & XFRM_GSO_SEGMENT) {
248                 esph->seq_no = htonl(xo->seq.low);
249         } else {
250                 ip_hdr(skb)->tot_len = htons(skb->len);
251                 ip_send_check(ip_hdr(skb));
252         }
253 
254         if (hw_offload)
255                 return 0;
256 
257         esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32));
258 
259         err = esp_output_tail(x, skb, &esp);
260         if (err)
261                 return err;
262 
263         secpath_reset(skb);
264 
265         return 0;
266 }
267 
268 static const struct net_offload esp4_offload = {
269         .callbacks = {
270                 .gro_receive = esp4_gro_receive,
271                 .gso_segment = esp4_gso_segment,
272         },
273 };
274 
275 static const struct xfrm_type_offload esp_type_offload = {
276         .description    = "ESP4 OFFLOAD",
277         .owner          = THIS_MODULE,
278         .proto          = IPPROTO_ESP,
279         .input_tail     = esp_input_tail,
280         .xmit           = esp_xmit,
281         .encap          = esp4_gso_encap,
282 };
283 
284 static int __init esp4_offload_init(void)
285 {
286         if (xfrm_register_type_offload(&esp_type_offload, AF_INET) < 0) {
287                 pr_info("%s: can't add xfrm type offload\n", __func__);
288                 return -EAGAIN;
289         }
290 
291         return inet_add_offload(&esp4_offload, IPPROTO_ESP);
292 }
293 
294 static void __exit esp4_offload_exit(void)
295 {
296         if (xfrm_unregister_type_offload(&esp_type_offload, AF_INET) < 0)
297                 pr_info("%s: can't remove xfrm type offload\n", __func__);
298 
299         inet_del_offload(&esp4_offload, IPPROTO_ESP);
300 }
301 
302 module_init(esp4_offload_init);
303 module_exit(esp4_offload_exit);
304 MODULE_LICENSE("GPL");
305 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
306 

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