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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPV4 GSO/GRO offload support
4 * Linux INET implementation
5 *
6 * TCPv4 GSO/GRO support
7 */
8
9#include <linux/indirect_call_wrapper.h>
10#include <linux/skbuff.h>
11#include <net/tcp.h>
12#include <net/protocol.h>
13
14static void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq,
15 unsigned int seq, unsigned int mss)
16{
17 while (skb) {
18 if (before(ts_seq, seq + mss)) {
19 skb_shinfo(skb)->tx_flags |= SKBTX_SW_TSTAMP;
20 skb_shinfo(skb)->tskey = ts_seq;
21 return;
22 }
23
24 skb = skb->next;
25 seq += mss;
26 }
27}
28
29static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb,
30 netdev_features_t features)
31{
32 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4))
33 return ERR_PTR(-EINVAL);
34
35 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
36 return ERR_PTR(-EINVAL);
37
38 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
39 const struct iphdr *iph = ip_hdr(skb);
40 struct tcphdr *th = tcp_hdr(skb);
41
42 /* Set up checksum pseudo header, usually expect stack to
43 * have done this already.
44 */
45
46 th->check = 0;
47 skb->ip_summed = CHECKSUM_PARTIAL;
48 __tcp_v4_send_check(skb, iph->saddr, iph->daddr);
49 }
50
51 return tcp_gso_segment(skb, features);
52}
53
54struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
55 netdev_features_t features)
56{
57 struct sk_buff *segs = ERR_PTR(-EINVAL);
58 unsigned int sum_truesize = 0;
59 struct tcphdr *th;
60 unsigned int thlen;
61 unsigned int seq;
62 __be32 delta;
63 unsigned int oldlen;
64 unsigned int mss;
65 struct sk_buff *gso_skb = skb;
66 __sum16 newcheck;
67 bool ooo_okay, copy_destructor;
68
69 th = tcp_hdr(skb);
70 thlen = th->doff * 4;
71 if (thlen < sizeof(*th))
72 goto out;
73
74 if (!pskb_may_pull(skb, thlen))
75 goto out;
76
77 oldlen = (u16)~skb->len;
78 __skb_pull(skb, thlen);
79
80 mss = skb_shinfo(skb)->gso_size;
81 if (unlikely(skb->len <= mss))
82 goto out;
83
84 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
85 /* Packet is from an untrusted source, reset gso_segs. */
86
87 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
88
89 segs = NULL;
90 goto out;
91 }
92
93 copy_destructor = gso_skb->destructor == tcp_wfree;
94 ooo_okay = gso_skb->ooo_okay;
95 /* All segments but the first should have ooo_okay cleared */
96 skb->ooo_okay = 0;
97
98 segs = skb_segment(skb, features);
99 if (IS_ERR(segs))
100 goto out;
101
102 /* Only first segment might have ooo_okay set */
103 segs->ooo_okay = ooo_okay;
104
105 /* GSO partial and frag_list segmentation only requires splitting
106 * the frame into an MSS multiple and possibly a remainder, both
107 * cases return a GSO skb. So update the mss now.
108 */
109 if (skb_is_gso(segs))
110 mss *= skb_shinfo(segs)->gso_segs;
111
112 delta = htonl(oldlen + (thlen + mss));
113
114 skb = segs;
115 th = tcp_hdr(skb);
116 seq = ntohl(th->seq);
117
118 if (unlikely(skb_shinfo(gso_skb)->tx_flags & SKBTX_SW_TSTAMP))
119 tcp_gso_tstamp(segs, skb_shinfo(gso_skb)->tskey, seq, mss);
120
121 newcheck = ~csum_fold((__force __wsum)((__force u32)th->check +
122 (__force u32)delta));
123
124 while (skb->next) {
125 th->fin = th->psh = 0;
126 th->check = newcheck;
127
128 if (skb->ip_summed == CHECKSUM_PARTIAL)
129 gso_reset_checksum(skb, ~th->check);
130 else
131 th->check = gso_make_checksum(skb, ~th->check);
132
133 seq += mss;
134 if (copy_destructor) {
135 skb->destructor = gso_skb->destructor;
136 skb->sk = gso_skb->sk;
137 sum_truesize += skb->truesize;
138 }
139 skb = skb->next;
140 th = tcp_hdr(skb);
141
142 th->seq = htonl(seq);
143 th->cwr = 0;
144 }
145
146 /* Following permits TCP Small Queues to work well with GSO :
147 * The callback to TCP stack will be called at the time last frag
148 * is freed at TX completion, and not right now when gso_skb
149 * is freed by GSO engine
150 */
151 if (copy_destructor) {
152 int delta;
153
154 swap(gso_skb->sk, skb->sk);
155 swap(gso_skb->destructor, skb->destructor);
156 sum_truesize += skb->truesize;
157 delta = sum_truesize - gso_skb->truesize;
158 /* In some pathological cases, delta can be negative.
159 * We need to either use refcount_add() or refcount_sub_and_test()
160 */
161 if (likely(delta >= 0))
162 refcount_add(delta, &skb->sk->sk_wmem_alloc);
163 else
164 WARN_ON_ONCE(refcount_sub_and_test(-delta, &skb->sk->sk_wmem_alloc));
165 }
166
167 delta = htonl(oldlen + (skb_tail_pointer(skb) -
168 skb_transport_header(skb)) +
169 skb->data_len);
170 th->check = ~csum_fold((__force __wsum)((__force u32)th->check +
171 (__force u32)delta));
172 if (skb->ip_summed == CHECKSUM_PARTIAL)
173 gso_reset_checksum(skb, ~th->check);
174 else
175 th->check = gso_make_checksum(skb, ~th->check);
176out:
177 return segs;
178}
179
180struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb)
181{
182 struct sk_buff *pp = NULL;
183 struct sk_buff *p;
184 struct tcphdr *th;
185 struct tcphdr *th2;
186 unsigned int len;
187 unsigned int thlen;
188 __be32 flags;
189 unsigned int mss = 1;
190 unsigned int hlen;
191 unsigned int off;
192 int flush = 1;
193 int i;
194
195 off = skb_gro_offset(skb);
196 hlen = off + sizeof(*th);
197 th = skb_gro_header_fast(skb, off);
198 if (skb_gro_header_hard(skb, hlen)) {
199 th = skb_gro_header_slow(skb, hlen, off);
200 if (unlikely(!th))
201 goto out;
202 }
203
204 thlen = th->doff * 4;
205 if (thlen < sizeof(*th))
206 goto out;
207
208 hlen = off + thlen;
209 if (skb_gro_header_hard(skb, hlen)) {
210 th = skb_gro_header_slow(skb, hlen, off);
211 if (unlikely(!th))
212 goto out;
213 }
214
215 skb_gro_pull(skb, thlen);
216
217 len = skb_gro_len(skb);
218 flags = tcp_flag_word(th);
219
220 list_for_each_entry(p, head, list) {
221 if (!NAPI_GRO_CB(p)->same_flow)
222 continue;
223
224 th2 = tcp_hdr(p);
225
226 if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
227 NAPI_GRO_CB(p)->same_flow = 0;
228 continue;
229 }
230
231 goto found;
232 }
233 p = NULL;
234 goto out_check_final;
235
236found:
237 /* Include the IP ID check below from the inner most IP hdr */
238 flush = NAPI_GRO_CB(p)->flush;
239 flush |= (__force int)(flags & TCP_FLAG_CWR);
240 flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
241 ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
242 flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
243 for (i = sizeof(*th); i < thlen; i += 4)
244 flush |= *(u32 *)((u8 *)th + i) ^
245 *(u32 *)((u8 *)th2 + i);
246
247 /* When we receive our second frame we can made a decision on if we
248 * continue this flow as an atomic flow with a fixed ID or if we use
249 * an incrementing ID.
250 */
251 if (NAPI_GRO_CB(p)->flush_id != 1 ||
252 NAPI_GRO_CB(p)->count != 1 ||
253 !NAPI_GRO_CB(p)->is_atomic)
254 flush |= NAPI_GRO_CB(p)->flush_id;
255 else
256 NAPI_GRO_CB(p)->is_atomic = false;
257
258 mss = skb_shinfo(p)->gso_size;
259
260 flush |= (len - 1) >= mss;
261 flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);
262#ifdef CONFIG_TLS_DEVICE
263 flush |= p->decrypted ^ skb->decrypted;
264#endif
265
266 if (flush || skb_gro_receive(p, skb)) {
267 mss = 1;
268 goto out_check_final;
269 }
270
271 tcp_flag_word(th2) |= flags & (TCP_FLAG_FIN | TCP_FLAG_PSH);
272
273out_check_final:
274 flush = len < mss;
275 flush |= (__force int)(flags & (TCP_FLAG_URG | TCP_FLAG_PSH |
276 TCP_FLAG_RST | TCP_FLAG_SYN |
277 TCP_FLAG_FIN));
278
279 if (p && (!NAPI_GRO_CB(skb)->same_flow || flush))
280 pp = p;
281
282out:
283 NAPI_GRO_CB(skb)->flush |= (flush != 0);
284
285 return pp;
286}
287
288int tcp_gro_complete(struct sk_buff *skb)
289{
290 struct tcphdr *th = tcp_hdr(skb);
291
292 skb->csum_start = (unsigned char *)th - skb->head;
293 skb->csum_offset = offsetof(struct tcphdr, check);
294 skb->ip_summed = CHECKSUM_PARTIAL;
295
296 skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
297
298 if (th->cwr)
299 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
300
301 if (skb->encapsulation)
302 skb->inner_transport_header = skb->transport_header;
303
304 return 0;
305}
306EXPORT_SYMBOL(tcp_gro_complete);
307
308INDIRECT_CALLABLE_SCOPE
309struct sk_buff *tcp4_gro_receive(struct list_head *head, struct sk_buff *skb)
310{
311 /* Don't bother verifying checksum if we're going to flush anyway. */
312 if (!NAPI_GRO_CB(skb)->flush &&
313 skb_gro_checksum_validate(skb, IPPROTO_TCP,
314 inet_gro_compute_pseudo)) {
315 NAPI_GRO_CB(skb)->flush = 1;
316 return NULL;
317 }
318
319 return tcp_gro_receive(head, skb);
320}
321
322INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
323{
324 const struct iphdr *iph = ip_hdr(skb);
325 struct tcphdr *th = tcp_hdr(skb);
326
327 th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
328 iph->daddr, 0);
329 skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
330
331 if (NAPI_GRO_CB(skb)->is_atomic)
332 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_FIXEDID;
333
334 return tcp_gro_complete(skb);
335}
336
337static const struct net_offload tcpv4_offload = {
338 .callbacks = {
339 .gso_segment = tcp4_gso_segment,
340 .gro_receive = tcp4_gro_receive,
341 .gro_complete = tcp4_gro_complete,
342 },
343};
344
345int __init tcpv4_offload_init(void)
346{
347 return inet_add_offload(&tcpv4_offload, IPPROTO_TCP);
348}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPV4 GSO/GRO offload support
4 * Linux INET implementation
5 *
6 * TCPv4 GSO/GRO support
7 */
8
9#include <linux/indirect_call_wrapper.h>
10#include <linux/skbuff.h>
11#include <net/gro.h>
12#include <net/gso.h>
13#include <net/tcp.h>
14#include <net/protocol.h>
15
16static void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq,
17 unsigned int seq, unsigned int mss)
18{
19 while (skb) {
20 if (before(ts_seq, seq + mss)) {
21 skb_shinfo(skb)->tx_flags |= SKBTX_SW_TSTAMP;
22 skb_shinfo(skb)->tskey = ts_seq;
23 return;
24 }
25
26 skb = skb->next;
27 seq += mss;
28 }
29}
30
31static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb,
32 netdev_features_t features)
33{
34 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4))
35 return ERR_PTR(-EINVAL);
36
37 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
38 return ERR_PTR(-EINVAL);
39
40 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
41 const struct iphdr *iph = ip_hdr(skb);
42 struct tcphdr *th = tcp_hdr(skb);
43
44 /* Set up checksum pseudo header, usually expect stack to
45 * have done this already.
46 */
47
48 th->check = 0;
49 skb->ip_summed = CHECKSUM_PARTIAL;
50 __tcp_v4_send_check(skb, iph->saddr, iph->daddr);
51 }
52
53 return tcp_gso_segment(skb, features);
54}
55
56struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
57 netdev_features_t features)
58{
59 struct sk_buff *segs = ERR_PTR(-EINVAL);
60 unsigned int sum_truesize = 0;
61 struct tcphdr *th;
62 unsigned int thlen;
63 unsigned int seq;
64 unsigned int oldlen;
65 unsigned int mss;
66 struct sk_buff *gso_skb = skb;
67 __sum16 newcheck;
68 bool ooo_okay, copy_destructor;
69 __wsum delta;
70
71 th = tcp_hdr(skb);
72 thlen = th->doff * 4;
73 if (thlen < sizeof(*th))
74 goto out;
75
76 if (!pskb_may_pull(skb, thlen))
77 goto out;
78
79 oldlen = ~skb->len;
80 __skb_pull(skb, thlen);
81
82 mss = skb_shinfo(skb)->gso_size;
83 if (unlikely(skb->len <= mss))
84 goto out;
85
86 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
87 /* Packet is from an untrusted source, reset gso_segs. */
88
89 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
90
91 segs = NULL;
92 goto out;
93 }
94
95 copy_destructor = gso_skb->destructor == tcp_wfree;
96 ooo_okay = gso_skb->ooo_okay;
97 /* All segments but the first should have ooo_okay cleared */
98 skb->ooo_okay = 0;
99
100 segs = skb_segment(skb, features);
101 if (IS_ERR(segs))
102 goto out;
103
104 /* Only first segment might have ooo_okay set */
105 segs->ooo_okay = ooo_okay;
106
107 /* GSO partial and frag_list segmentation only requires splitting
108 * the frame into an MSS multiple and possibly a remainder, both
109 * cases return a GSO skb. So update the mss now.
110 */
111 if (skb_is_gso(segs))
112 mss *= skb_shinfo(segs)->gso_segs;
113
114 delta = (__force __wsum)htonl(oldlen + thlen + mss);
115
116 skb = segs;
117 th = tcp_hdr(skb);
118 seq = ntohl(th->seq);
119
120 if (unlikely(skb_shinfo(gso_skb)->tx_flags & SKBTX_SW_TSTAMP))
121 tcp_gso_tstamp(segs, skb_shinfo(gso_skb)->tskey, seq, mss);
122
123 newcheck = ~csum_fold(csum_add(csum_unfold(th->check), delta));
124
125 while (skb->next) {
126 th->fin = th->psh = 0;
127 th->check = newcheck;
128
129 if (skb->ip_summed == CHECKSUM_PARTIAL)
130 gso_reset_checksum(skb, ~th->check);
131 else
132 th->check = gso_make_checksum(skb, ~th->check);
133
134 seq += mss;
135 if (copy_destructor) {
136 skb->destructor = gso_skb->destructor;
137 skb->sk = gso_skb->sk;
138 sum_truesize += skb->truesize;
139 }
140 skb = skb->next;
141 th = tcp_hdr(skb);
142
143 th->seq = htonl(seq);
144 th->cwr = 0;
145 }
146
147 /* Following permits TCP Small Queues to work well with GSO :
148 * The callback to TCP stack will be called at the time last frag
149 * is freed at TX completion, and not right now when gso_skb
150 * is freed by GSO engine
151 */
152 if (copy_destructor) {
153 int delta;
154
155 swap(gso_skb->sk, skb->sk);
156 swap(gso_skb->destructor, skb->destructor);
157 sum_truesize += skb->truesize;
158 delta = sum_truesize - gso_skb->truesize;
159 /* In some pathological cases, delta can be negative.
160 * We need to either use refcount_add() or refcount_sub_and_test()
161 */
162 if (likely(delta >= 0))
163 refcount_add(delta, &skb->sk->sk_wmem_alloc);
164 else
165 WARN_ON_ONCE(refcount_sub_and_test(-delta, &skb->sk->sk_wmem_alloc));
166 }
167
168 delta = (__force __wsum)htonl(oldlen +
169 (skb_tail_pointer(skb) -
170 skb_transport_header(skb)) +
171 skb->data_len);
172 th->check = ~csum_fold(csum_add(csum_unfold(th->check), delta));
173 if (skb->ip_summed == CHECKSUM_PARTIAL)
174 gso_reset_checksum(skb, ~th->check);
175 else
176 th->check = gso_make_checksum(skb, ~th->check);
177out:
178 return segs;
179}
180
181struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb)
182{
183 struct sk_buff *pp = NULL;
184 struct sk_buff *p;
185 struct tcphdr *th;
186 struct tcphdr *th2;
187 unsigned int len;
188 unsigned int thlen;
189 __be32 flags;
190 unsigned int mss = 1;
191 unsigned int hlen;
192 unsigned int off;
193 int flush = 1;
194 int i;
195
196 off = skb_gro_offset(skb);
197 hlen = off + sizeof(*th);
198 th = skb_gro_header(skb, hlen, off);
199 if (unlikely(!th))
200 goto out;
201
202 thlen = th->doff * 4;
203 if (thlen < sizeof(*th))
204 goto out;
205
206 hlen = off + thlen;
207 if (!skb_gro_may_pull(skb, hlen)) {
208 th = skb_gro_header_slow(skb, hlen, off);
209 if (unlikely(!th))
210 goto out;
211 }
212
213 skb_gro_pull(skb, thlen);
214
215 len = skb_gro_len(skb);
216 flags = tcp_flag_word(th);
217
218 list_for_each_entry(p, head, list) {
219 if (!NAPI_GRO_CB(p)->same_flow)
220 continue;
221
222 th2 = tcp_hdr(p);
223
224 if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
225 NAPI_GRO_CB(p)->same_flow = 0;
226 continue;
227 }
228
229 goto found;
230 }
231 p = NULL;
232 goto out_check_final;
233
234found:
235 /* Include the IP ID check below from the inner most IP hdr */
236 flush = NAPI_GRO_CB(p)->flush;
237 flush |= (__force int)(flags & TCP_FLAG_CWR);
238 flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
239 ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
240 flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
241 for (i = sizeof(*th); i < thlen; i += 4)
242 flush |= *(u32 *)((u8 *)th + i) ^
243 *(u32 *)((u8 *)th2 + i);
244
245 /* When we receive our second frame we can made a decision on if we
246 * continue this flow as an atomic flow with a fixed ID or if we use
247 * an incrementing ID.
248 */
249 if (NAPI_GRO_CB(p)->flush_id != 1 ||
250 NAPI_GRO_CB(p)->count != 1 ||
251 !NAPI_GRO_CB(p)->is_atomic)
252 flush |= NAPI_GRO_CB(p)->flush_id;
253 else
254 NAPI_GRO_CB(p)->is_atomic = false;
255
256 mss = skb_shinfo(p)->gso_size;
257
258 /* If skb is a GRO packet, make sure its gso_size matches prior packet mss.
259 * If it is a single frame, do not aggregate it if its length
260 * is bigger than our mss.
261 */
262 if (unlikely(skb_is_gso(skb)))
263 flush |= (mss != skb_shinfo(skb)->gso_size);
264 else
265 flush |= (len - 1) >= mss;
266
267 flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);
268#ifdef CONFIG_TLS_DEVICE
269 flush |= p->decrypted ^ skb->decrypted;
270#endif
271
272 if (flush || skb_gro_receive(p, skb)) {
273 mss = 1;
274 goto out_check_final;
275 }
276
277 tcp_flag_word(th2) |= flags & (TCP_FLAG_FIN | TCP_FLAG_PSH);
278
279out_check_final:
280 /* Force a flush if last segment is smaller than mss. */
281 if (unlikely(skb_is_gso(skb)))
282 flush = len != NAPI_GRO_CB(skb)->count * skb_shinfo(skb)->gso_size;
283 else
284 flush = len < mss;
285
286 flush |= (__force int)(flags & (TCP_FLAG_URG | TCP_FLAG_PSH |
287 TCP_FLAG_RST | TCP_FLAG_SYN |
288 TCP_FLAG_FIN));
289
290 if (p && (!NAPI_GRO_CB(skb)->same_flow || flush))
291 pp = p;
292
293out:
294 NAPI_GRO_CB(skb)->flush |= (flush != 0);
295
296 return pp;
297}
298
299void tcp_gro_complete(struct sk_buff *skb)
300{
301 struct tcphdr *th = tcp_hdr(skb);
302 struct skb_shared_info *shinfo;
303
304 if (skb->encapsulation)
305 skb->inner_transport_header = skb->transport_header;
306
307 skb->csum_start = (unsigned char *)th - skb->head;
308 skb->csum_offset = offsetof(struct tcphdr, check);
309 skb->ip_summed = CHECKSUM_PARTIAL;
310
311 shinfo = skb_shinfo(skb);
312 shinfo->gso_segs = NAPI_GRO_CB(skb)->count;
313
314 if (th->cwr)
315 shinfo->gso_type |= SKB_GSO_TCP_ECN;
316}
317EXPORT_SYMBOL(tcp_gro_complete);
318
319INDIRECT_CALLABLE_SCOPE
320struct sk_buff *tcp4_gro_receive(struct list_head *head, struct sk_buff *skb)
321{
322 /* Don't bother verifying checksum if we're going to flush anyway. */
323 if (!NAPI_GRO_CB(skb)->flush &&
324 skb_gro_checksum_validate(skb, IPPROTO_TCP,
325 inet_gro_compute_pseudo)) {
326 NAPI_GRO_CB(skb)->flush = 1;
327 return NULL;
328 }
329
330 return tcp_gro_receive(head, skb);
331}
332
333INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
334{
335 const struct iphdr *iph = ip_hdr(skb);
336 struct tcphdr *th = tcp_hdr(skb);
337
338 th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
339 iph->daddr, 0);
340
341 skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4 |
342 (NAPI_GRO_CB(skb)->is_atomic * SKB_GSO_TCP_FIXEDID);
343
344 tcp_gro_complete(skb);
345 return 0;
346}
347
348int __init tcpv4_offload_init(void)
349{
350 net_hotdata.tcpv4_offload = (struct net_offload) {
351 .callbacks = {
352 .gso_segment = tcp4_gso_segment,
353 .gro_receive = tcp4_gro_receive,
354 .gro_complete = tcp4_gro_complete,
355 },
356 };
357 return inet_add_offload(&net_hotdata.tcpv4_offload, IPPROTO_TCP);
358}