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1/*
2 * IPV6 GSO/GRO offload support
3 * Linux INET6 implementation
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 */
10
11#include <linux/kernel.h>
12#include <linux/socket.h>
13#include <linux/netdevice.h>
14#include <linux/skbuff.h>
15#include <linux/printk.h>
16
17#include <net/protocol.h>
18#include <net/ipv6.h>
19
20#include "ip6_offload.h"
21
22static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
23{
24 const struct net_offload *ops = NULL;
25
26 for (;;) {
27 struct ipv6_opt_hdr *opth;
28 int len;
29
30 if (proto != NEXTHDR_HOP) {
31 ops = rcu_dereference(inet6_offloads[proto]);
32
33 if (unlikely(!ops))
34 break;
35
36 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
37 break;
38 }
39
40 if (unlikely(!pskb_may_pull(skb, 8)))
41 break;
42
43 opth = (void *)skb->data;
44 len = ipv6_optlen(opth);
45
46 if (unlikely(!pskb_may_pull(skb, len)))
47 break;
48
49 proto = opth->nexthdr;
50 __skb_pull(skb, len);
51 }
52
53 return proto;
54}
55
56static int ipv6_gso_send_check(struct sk_buff *skb)
57{
58 const struct ipv6hdr *ipv6h;
59 const struct net_offload *ops;
60 int err = -EINVAL;
61
62 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
63 goto out;
64
65 ipv6h = ipv6_hdr(skb);
66 __skb_pull(skb, sizeof(*ipv6h));
67 err = -EPROTONOSUPPORT;
68
69 ops = rcu_dereference(inet6_offloads[
70 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
71
72 if (likely(ops && ops->callbacks.gso_send_check)) {
73 skb_reset_transport_header(skb);
74 err = ops->callbacks.gso_send_check(skb);
75 }
76
77out:
78 return err;
79}
80
81static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
82 netdev_features_t features)
83{
84 struct sk_buff *segs = ERR_PTR(-EINVAL);
85 struct ipv6hdr *ipv6h;
86 const struct net_offload *ops;
87 int proto;
88 struct frag_hdr *fptr;
89 unsigned int unfrag_ip6hlen;
90 u8 *prevhdr;
91 int offset = 0;
92 bool encap, udpfrag;
93 int nhoff;
94
95 if (unlikely(skb_shinfo(skb)->gso_type &
96 ~(SKB_GSO_UDP |
97 SKB_GSO_DODGY |
98 SKB_GSO_TCP_ECN |
99 SKB_GSO_GRE |
100 SKB_GSO_IPIP |
101 SKB_GSO_SIT |
102 SKB_GSO_UDP_TUNNEL |
103 SKB_GSO_MPLS |
104 SKB_GSO_TCPV6 |
105 0)))
106 goto out;
107
108 skb_reset_network_header(skb);
109 nhoff = skb_network_header(skb) - skb_mac_header(skb);
110 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
111 goto out;
112
113 encap = SKB_GSO_CB(skb)->encap_level > 0;
114 if (encap)
115 features = skb->dev->hw_enc_features & netif_skb_features(skb);
116 SKB_GSO_CB(skb)->encap_level += sizeof(*ipv6h);
117
118 ipv6h = ipv6_hdr(skb);
119 __skb_pull(skb, sizeof(*ipv6h));
120 segs = ERR_PTR(-EPROTONOSUPPORT);
121
122 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
123
124 if (skb->encapsulation &&
125 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP))
126 udpfrag = proto == IPPROTO_UDP && encap;
127 else
128 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;
129
130 ops = rcu_dereference(inet6_offloads[proto]);
131 if (likely(ops && ops->callbacks.gso_segment)) {
132 skb_reset_transport_header(skb);
133 segs = ops->callbacks.gso_segment(skb, features);
134 }
135
136 if (IS_ERR(segs))
137 goto out;
138
139 for (skb = segs; skb; skb = skb->next) {
140 ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff);
141 ipv6h->payload_len = htons(skb->len - nhoff - sizeof(*ipv6h));
142 skb->network_header = (u8 *)ipv6h - skb->head;
143
144 if (udpfrag) {
145 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
146 fptr = (struct frag_hdr *)((u8 *)ipv6h + unfrag_ip6hlen);
147 fptr->frag_off = htons(offset);
148 if (skb->next != NULL)
149 fptr->frag_off |= htons(IP6_MF);
150 offset += (ntohs(ipv6h->payload_len) -
151 sizeof(struct frag_hdr));
152 }
153 if (encap)
154 skb_reset_inner_headers(skb);
155 }
156
157out:
158 return segs;
159}
160
161/* Return the total length of all the extension hdrs, following the same
162 * logic in ipv6_gso_pull_exthdrs() when parsing ext-hdrs.
163 */
164static int ipv6_exthdrs_len(struct ipv6hdr *iph,
165 const struct net_offload **opps)
166{
167 struct ipv6_opt_hdr *opth = (void *)iph;
168 int len = 0, proto, optlen = sizeof(*iph);
169
170 proto = iph->nexthdr;
171 for (;;) {
172 if (proto != NEXTHDR_HOP) {
173 *opps = rcu_dereference(inet6_offloads[proto]);
174 if (unlikely(!(*opps)))
175 break;
176 if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
177 break;
178 }
179 opth = (void *)opth + optlen;
180 optlen = ipv6_optlen(opth);
181 len += optlen;
182 proto = opth->nexthdr;
183 }
184 return len;
185}
186
187static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
188 struct sk_buff *skb)
189{
190 const struct net_offload *ops;
191 struct sk_buff **pp = NULL;
192 struct sk_buff *p;
193 struct ipv6hdr *iph;
194 unsigned int nlen;
195 unsigned int hlen;
196 unsigned int off;
197 u16 flush = 1;
198 int proto;
199
200 off = skb_gro_offset(skb);
201 hlen = off + sizeof(*iph);
202 iph = skb_gro_header_fast(skb, off);
203 if (skb_gro_header_hard(skb, hlen)) {
204 iph = skb_gro_header_slow(skb, hlen, off);
205 if (unlikely(!iph))
206 goto out;
207 }
208
209 skb_set_network_header(skb, off);
210 skb_gro_pull(skb, sizeof(*iph));
211 skb_set_transport_header(skb, skb_gro_offset(skb));
212
213 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
214
215 rcu_read_lock();
216 proto = iph->nexthdr;
217 ops = rcu_dereference(inet6_offloads[proto]);
218 if (!ops || !ops->callbacks.gro_receive) {
219 __pskb_pull(skb, skb_gro_offset(skb));
220 proto = ipv6_gso_pull_exthdrs(skb, proto);
221 skb_gro_pull(skb, -skb_transport_offset(skb));
222 skb_reset_transport_header(skb);
223 __skb_push(skb, skb_gro_offset(skb));
224
225 ops = rcu_dereference(inet6_offloads[proto]);
226 if (!ops || !ops->callbacks.gro_receive)
227 goto out_unlock;
228
229 iph = ipv6_hdr(skb);
230 }
231
232 NAPI_GRO_CB(skb)->proto = proto;
233
234 flush--;
235 nlen = skb_network_header_len(skb);
236
237 for (p = *head; p; p = p->next) {
238 const struct ipv6hdr *iph2;
239 __be32 first_word; /* <Version:4><Traffic_Class:8><Flow_Label:20> */
240
241 if (!NAPI_GRO_CB(p)->same_flow)
242 continue;
243
244 iph2 = (struct ipv6hdr *)(p->data + off);
245 first_word = *(__be32 *)iph ^ *(__be32 *)iph2 ;
246
247 /* All fields must match except length and Traffic Class.
248 * XXX skbs on the gro_list have all been parsed and pulled
249 * already so we don't need to compare nlen
250 * (nlen != (sizeof(*iph2) + ipv6_exthdrs_len(iph2, &ops)))
251 * memcmp() alone below is suffcient, right?
252 */
253 if ((first_word & htonl(0xF00FFFFF)) ||
254 memcmp(&iph->nexthdr, &iph2->nexthdr,
255 nlen - offsetof(struct ipv6hdr, nexthdr))) {
256 NAPI_GRO_CB(p)->same_flow = 0;
257 continue;
258 }
259 /* flush if Traffic Class fields are different */
260 NAPI_GRO_CB(p)->flush |= !!(first_word & htonl(0x0FF00000));
261 NAPI_GRO_CB(p)->flush |= flush;
262 }
263
264 NAPI_GRO_CB(skb)->flush |= flush;
265
266 skb_gro_postpull_rcsum(skb, iph, nlen);
267
268 pp = ops->callbacks.gro_receive(head, skb);
269
270out_unlock:
271 rcu_read_unlock();
272
273out:
274 NAPI_GRO_CB(skb)->flush |= flush;
275
276 return pp;
277}
278
279static int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
280{
281 const struct net_offload *ops;
282 struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + nhoff);
283 int err = -ENOSYS;
284
285 iph->payload_len = htons(skb->len - nhoff - sizeof(*iph));
286
287 rcu_read_lock();
288
289 nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
290 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
291 goto out_unlock;
292
293 err = ops->callbacks.gro_complete(skb, nhoff);
294
295out_unlock:
296 rcu_read_unlock();
297
298 return err;
299}
300
301static struct packet_offload ipv6_packet_offload __read_mostly = {
302 .type = cpu_to_be16(ETH_P_IPV6),
303 .callbacks = {
304 .gso_send_check = ipv6_gso_send_check,
305 .gso_segment = ipv6_gso_segment,
306 .gro_receive = ipv6_gro_receive,
307 .gro_complete = ipv6_gro_complete,
308 },
309};
310
311static const struct net_offload sit_offload = {
312 .callbacks = {
313 .gso_send_check = ipv6_gso_send_check,
314 .gso_segment = ipv6_gso_segment,
315 },
316};
317
318static int __init ipv6_offload_init(void)
319{
320
321 if (tcpv6_offload_init() < 0)
322 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
323 if (udp_offload_init() < 0)
324 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
325 if (ipv6_exthdrs_offload_init() < 0)
326 pr_crit("%s: Cannot add EXTHDRS protocol offload\n", __func__);
327
328 dev_add_offload(&ipv6_packet_offload);
329
330 inet_add_offload(&sit_offload, IPPROTO_IPV6);
331
332 return 0;
333}
334
335fs_initcall(ipv6_offload_init);
1/*
2 * IPV6 GSO/GRO offload support
3 * Linux INET6 implementation
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 */
10
11#include <linux/kernel.h>
12#include <linux/socket.h>
13#include <linux/netdevice.h>
14#include <linux/skbuff.h>
15#include <linux/printk.h>
16
17#include <net/protocol.h>
18#include <net/ipv6.h>
19#include <net/inet_common.h>
20
21#include "ip6_offload.h"
22
23static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
24{
25 const struct net_offload *ops = NULL;
26
27 for (;;) {
28 struct ipv6_opt_hdr *opth;
29 int len;
30
31 if (proto != NEXTHDR_HOP) {
32 ops = rcu_dereference(inet6_offloads[proto]);
33
34 if (unlikely(!ops))
35 break;
36
37 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
38 break;
39 }
40
41 if (unlikely(!pskb_may_pull(skb, 8)))
42 break;
43
44 opth = (void *)skb->data;
45 len = ipv6_optlen(opth);
46
47 if (unlikely(!pskb_may_pull(skb, len)))
48 break;
49
50 opth = (void *)skb->data;
51 proto = opth->nexthdr;
52 __skb_pull(skb, len);
53 }
54
55 return proto;
56}
57
58static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
59 netdev_features_t features)
60{
61 struct sk_buff *segs = ERR_PTR(-EINVAL);
62 struct ipv6hdr *ipv6h;
63 const struct net_offload *ops;
64 int proto;
65 struct frag_hdr *fptr;
66 unsigned int payload_len;
67 u8 *prevhdr;
68 int offset = 0;
69 bool encap, udpfrag;
70 int nhoff;
71 bool gso_partial;
72
73 skb_reset_network_header(skb);
74 nhoff = skb_network_header(skb) - skb_mac_header(skb);
75 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
76 goto out;
77
78 encap = SKB_GSO_CB(skb)->encap_level > 0;
79 if (encap)
80 features &= skb->dev->hw_enc_features;
81 SKB_GSO_CB(skb)->encap_level += sizeof(*ipv6h);
82
83 ipv6h = ipv6_hdr(skb);
84 __skb_pull(skb, sizeof(*ipv6h));
85 segs = ERR_PTR(-EPROTONOSUPPORT);
86
87 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
88
89 if (skb->encapsulation &&
90 skb_shinfo(skb)->gso_type & (SKB_GSO_IPXIP4 | SKB_GSO_IPXIP6))
91 udpfrag = proto == IPPROTO_UDP && encap;
92 else
93 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;
94
95 ops = rcu_dereference(inet6_offloads[proto]);
96 if (likely(ops && ops->callbacks.gso_segment)) {
97 skb_reset_transport_header(skb);
98 segs = ops->callbacks.gso_segment(skb, features);
99 }
100
101 if (IS_ERR_OR_NULL(segs))
102 goto out;
103
104 gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
105
106 for (skb = segs; skb; skb = skb->next) {
107 ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff);
108 if (gso_partial && skb_is_gso(skb))
109 payload_len = skb_shinfo(skb)->gso_size +
110 SKB_GSO_CB(skb)->data_offset +
111 skb->head - (unsigned char *)(ipv6h + 1);
112 else
113 payload_len = skb->len - nhoff - sizeof(*ipv6h);
114 ipv6h->payload_len = htons(payload_len);
115 skb->network_header = (u8 *)ipv6h - skb->head;
116
117 if (udpfrag) {
118 int err = ip6_find_1stfragopt(skb, &prevhdr);
119 if (err < 0) {
120 kfree_skb_list(segs);
121 return ERR_PTR(err);
122 }
123 fptr = (struct frag_hdr *)((u8 *)ipv6h + err);
124 fptr->frag_off = htons(offset);
125 if (skb->next)
126 fptr->frag_off |= htons(IP6_MF);
127 offset += (ntohs(ipv6h->payload_len) -
128 sizeof(struct frag_hdr));
129 }
130 if (encap)
131 skb_reset_inner_headers(skb);
132 }
133
134out:
135 return segs;
136}
137
138/* Return the total length of all the extension hdrs, following the same
139 * logic in ipv6_gso_pull_exthdrs() when parsing ext-hdrs.
140 */
141static int ipv6_exthdrs_len(struct ipv6hdr *iph,
142 const struct net_offload **opps)
143{
144 struct ipv6_opt_hdr *opth = (void *)iph;
145 int len = 0, proto, optlen = sizeof(*iph);
146
147 proto = iph->nexthdr;
148 for (;;) {
149 if (proto != NEXTHDR_HOP) {
150 *opps = rcu_dereference(inet6_offloads[proto]);
151 if (unlikely(!(*opps)))
152 break;
153 if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
154 break;
155 }
156 opth = (void *)opth + optlen;
157 optlen = ipv6_optlen(opth);
158 len += optlen;
159 proto = opth->nexthdr;
160 }
161 return len;
162}
163
164static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
165 struct sk_buff *skb)
166{
167 const struct net_offload *ops;
168 struct sk_buff **pp = NULL;
169 struct sk_buff *p;
170 struct ipv6hdr *iph;
171 unsigned int nlen;
172 unsigned int hlen;
173 unsigned int off;
174 u16 flush = 1;
175 int proto;
176
177 off = skb_gro_offset(skb);
178 hlen = off + sizeof(*iph);
179 iph = skb_gro_header_fast(skb, off);
180 if (skb_gro_header_hard(skb, hlen)) {
181 iph = skb_gro_header_slow(skb, hlen, off);
182 if (unlikely(!iph))
183 goto out;
184 }
185
186 skb_set_network_header(skb, off);
187 skb_gro_pull(skb, sizeof(*iph));
188 skb_set_transport_header(skb, skb_gro_offset(skb));
189
190 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
191
192 rcu_read_lock();
193 proto = iph->nexthdr;
194 ops = rcu_dereference(inet6_offloads[proto]);
195 if (!ops || !ops->callbacks.gro_receive) {
196 __pskb_pull(skb, skb_gro_offset(skb));
197 skb_gro_frag0_invalidate(skb);
198 proto = ipv6_gso_pull_exthdrs(skb, proto);
199 skb_gro_pull(skb, -skb_transport_offset(skb));
200 skb_reset_transport_header(skb);
201 __skb_push(skb, skb_gro_offset(skb));
202
203 ops = rcu_dereference(inet6_offloads[proto]);
204 if (!ops || !ops->callbacks.gro_receive)
205 goto out_unlock;
206
207 iph = ipv6_hdr(skb);
208 }
209
210 NAPI_GRO_CB(skb)->proto = proto;
211
212 flush--;
213 nlen = skb_network_header_len(skb);
214
215 for (p = *head; p; p = p->next) {
216 const struct ipv6hdr *iph2;
217 __be32 first_word; /* <Version:4><Traffic_Class:8><Flow_Label:20> */
218
219 if (!NAPI_GRO_CB(p)->same_flow)
220 continue;
221
222 iph2 = (struct ipv6hdr *)(p->data + off);
223 first_word = *(__be32 *)iph ^ *(__be32 *)iph2;
224
225 /* All fields must match except length and Traffic Class.
226 * XXX skbs on the gro_list have all been parsed and pulled
227 * already so we don't need to compare nlen
228 * (nlen != (sizeof(*iph2) + ipv6_exthdrs_len(iph2, &ops)))
229 * memcmp() alone below is suffcient, right?
230 */
231 if ((first_word & htonl(0xF00FFFFF)) ||
232 memcmp(&iph->nexthdr, &iph2->nexthdr,
233 nlen - offsetof(struct ipv6hdr, nexthdr))) {
234 NAPI_GRO_CB(p)->same_flow = 0;
235 continue;
236 }
237 /* flush if Traffic Class fields are different */
238 NAPI_GRO_CB(p)->flush |= !!(first_word & htonl(0x0FF00000));
239 NAPI_GRO_CB(p)->flush |= flush;
240
241 /* If the previous IP ID value was based on an atomic
242 * datagram we can overwrite the value and ignore it.
243 */
244 if (NAPI_GRO_CB(skb)->is_atomic)
245 NAPI_GRO_CB(p)->flush_id = 0;
246 }
247
248 NAPI_GRO_CB(skb)->is_atomic = true;
249 NAPI_GRO_CB(skb)->flush |= flush;
250
251 skb_gro_postpull_rcsum(skb, iph, nlen);
252
253 pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
254
255out_unlock:
256 rcu_read_unlock();
257
258out:
259 skb_gro_flush_final(skb, pp, flush);
260
261 return pp;
262}
263
264static struct sk_buff **sit_ip6ip6_gro_receive(struct sk_buff **head,
265 struct sk_buff *skb)
266{
267 /* Common GRO receive for SIT and IP6IP6 */
268
269 if (NAPI_GRO_CB(skb)->encap_mark) {
270 NAPI_GRO_CB(skb)->flush = 1;
271 return NULL;
272 }
273
274 NAPI_GRO_CB(skb)->encap_mark = 1;
275
276 return ipv6_gro_receive(head, skb);
277}
278
279static struct sk_buff **ip4ip6_gro_receive(struct sk_buff **head,
280 struct sk_buff *skb)
281{
282 /* Common GRO receive for SIT and IP6IP6 */
283
284 if (NAPI_GRO_CB(skb)->encap_mark) {
285 NAPI_GRO_CB(skb)->flush = 1;
286 return NULL;
287 }
288
289 NAPI_GRO_CB(skb)->encap_mark = 1;
290
291 return inet_gro_receive(head, skb);
292}
293
294static int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
295{
296 const struct net_offload *ops;
297 struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + nhoff);
298 int err = -ENOSYS;
299
300 if (skb->encapsulation) {
301 skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IPV6));
302 skb_set_inner_network_header(skb, nhoff);
303 }
304
305 iph->payload_len = htons(skb->len - nhoff - sizeof(*iph));
306
307 rcu_read_lock();
308
309 nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
310 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
311 goto out_unlock;
312
313 err = ops->callbacks.gro_complete(skb, nhoff);
314
315out_unlock:
316 rcu_read_unlock();
317
318 return err;
319}
320
321static int sit_gro_complete(struct sk_buff *skb, int nhoff)
322{
323 skb->encapsulation = 1;
324 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
325 return ipv6_gro_complete(skb, nhoff);
326}
327
328static int ip6ip6_gro_complete(struct sk_buff *skb, int nhoff)
329{
330 skb->encapsulation = 1;
331 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
332 return ipv6_gro_complete(skb, nhoff);
333}
334
335static int ip4ip6_gro_complete(struct sk_buff *skb, int nhoff)
336{
337 skb->encapsulation = 1;
338 skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
339 return inet_gro_complete(skb, nhoff);
340}
341
342static struct packet_offload ipv6_packet_offload __read_mostly = {
343 .type = cpu_to_be16(ETH_P_IPV6),
344 .callbacks = {
345 .gso_segment = ipv6_gso_segment,
346 .gro_receive = ipv6_gro_receive,
347 .gro_complete = ipv6_gro_complete,
348 },
349};
350
351static const struct net_offload sit_offload = {
352 .callbacks = {
353 .gso_segment = ipv6_gso_segment,
354 .gro_receive = sit_ip6ip6_gro_receive,
355 .gro_complete = sit_gro_complete,
356 },
357};
358
359static const struct net_offload ip4ip6_offload = {
360 .callbacks = {
361 .gso_segment = inet_gso_segment,
362 .gro_receive = ip4ip6_gro_receive,
363 .gro_complete = ip4ip6_gro_complete,
364 },
365};
366
367static const struct net_offload ip6ip6_offload = {
368 .callbacks = {
369 .gso_segment = ipv6_gso_segment,
370 .gro_receive = sit_ip6ip6_gro_receive,
371 .gro_complete = ip6ip6_gro_complete,
372 },
373};
374static int __init ipv6_offload_init(void)
375{
376
377 if (tcpv6_offload_init() < 0)
378 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
379 if (ipv6_exthdrs_offload_init() < 0)
380 pr_crit("%s: Cannot add EXTHDRS protocol offload\n", __func__);
381
382 dev_add_offload(&ipv6_packet_offload);
383
384 inet_add_offload(&sit_offload, IPPROTO_IPV6);
385 inet6_add_offload(&ip6ip6_offload, IPPROTO_IPV6);
386 inet6_add_offload(&ip4ip6_offload, IPPROTO_IPIP);
387
388 return 0;
389}
390
391fs_initcall(ipv6_offload_init);