Commit | Line | Data |
---|---|---|
da5bab07 DB |
1 | /* |
2 | * IPV4 GSO/GRO offload support | |
3 | * Linux INET 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 | * UDPv4 GSO support | |
11 | */ | |
12 | ||
13 | #include <linux/skbuff.h> | |
14 | #include <net/udp.h> | |
15 | #include <net/protocol.h> | |
16 | ||
8bce6d7d TH |
17 | static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb, |
18 | netdev_features_t features, | |
19 | struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb, | |
20 | netdev_features_t features), | |
4bcb877d | 21 | __be16 new_protocol, bool is_ipv6) |
155e010e | 22 | { |
dbef491e | 23 | int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb); |
880388aa | 24 | bool remcsum, need_csum, offload_csum, gso_partial; |
155e010e | 25 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
dbef491e | 26 | struct udphdr *uh = udp_hdr(skb); |
155e010e | 27 | u16 mac_offset = skb->mac_header; |
155e010e | 28 | __be16 protocol = skb->protocol; |
dbef491e | 29 | u16 mac_len = skb->mac_len; |
155e010e | 30 | int udp_offset, outer_hlen; |
08334824 | 31 | __wsum partial; |
b40c5f4f | 32 | bool need_ipsec; |
155e010e TH |
33 | |
34 | if (unlikely(!pskb_may_pull(skb, tnl_hlen))) | |
35 | goto out; | |
36 | ||
08334824 AD |
37 | /* Adjust partial header checksum to negate old length. |
38 | * We cannot rely on the value contained in uh->len as it is | |
39 | * possible that the actual value exceeds the boundaries of the | |
40 | * 16 bit length field due to the header being added outside of an | |
41 | * IP or IPv6 frame that was already limited to 64K - 1. | |
42 | */ | |
802ab55a AD |
43 | if (skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) |
44 | partial = (__force __wsum)uh->len; | |
45 | else | |
46 | partial = (__force __wsum)htonl(skb->len); | |
47 | partial = csum_sub(csum_unfold(uh->check), partial); | |
dbef491e AD |
48 | |
49 | /* setup inner skb. */ | |
155e010e | 50 | skb->encapsulation = 0; |
5197f349 | 51 | SKB_GSO_CB(skb)->encap_level = 0; |
155e010e TH |
52 | __skb_pull(skb, tnl_hlen); |
53 | skb_reset_mac_header(skb); | |
54 | skb_set_network_header(skb, skb_inner_network_offset(skb)); | |
55 | skb->mac_len = skb_inner_network_offset(skb); | |
8bce6d7d | 56 | skb->protocol = new_protocol; |
fdaefd62 AD |
57 | |
58 | need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM); | |
4bcb877d | 59 | skb->encap_hdr_csum = need_csum; |
fdaefd62 AD |
60 | |
61 | remcsum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TUNNEL_REMCSUM); | |
e585f236 | 62 | skb->remcsum_offload = remcsum; |
155e010e | 63 | |
b40c5f4f | 64 | need_ipsec = skb_dst(skb) && dst_xfrm(skb_dst(skb)); |
4bcb877d TH |
65 | /* Try to offload checksum if possible */ |
66 | offload_csum = !!(need_csum && | |
b40c5f4f | 67 | !need_ipsec && |
fdaefd62 AD |
68 | (skb->dev->features & |
69 | (is_ipv6 ? (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM) : | |
70 | (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)))); | |
155e010e | 71 | |
bef3c6c9 AD |
72 | features &= skb->dev->hw_enc_features; |
73 | ||
7fbeffed AD |
74 | /* The only checksum offload we care about from here on out is the |
75 | * outer one so strip the existing checksum feature flags and | |
76 | * instead set the flag based on our outer checksum offload value. | |
77 | */ | |
880388aa | 78 | if (remcsum) { |
7fbeffed | 79 | features &= ~NETIF_F_CSUM_MASK; |
22463876 | 80 | if (!need_csum || offload_csum) |
7fbeffed AD |
81 | features |= NETIF_F_HW_CSUM; |
82 | } | |
83 | ||
155e010e | 84 | /* segment inner packet. */ |
bef3c6c9 | 85 | segs = gso_inner_segment(skb, features); |
27446442 | 86 | if (IS_ERR_OR_NULL(segs)) { |
155e010e TH |
87 | skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset, |
88 | mac_len); | |
89 | goto out; | |
90 | } | |
91 | ||
07b26c94 SK |
92 | gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL); |
93 | ||
155e010e TH |
94 | outer_hlen = skb_tnl_header_len(skb); |
95 | udp_offset = outer_hlen - tnl_hlen; | |
96 | skb = segs; | |
97 | do { | |
802ab55a | 98 | unsigned int len; |
4bcb877d | 99 | |
fdaefd62 | 100 | if (remcsum) |
4bcb877d | 101 | skb->ip_summed = CHECKSUM_NONE; |
fdaefd62 AD |
102 | |
103 | /* Set up inner headers if we are offloading inner checksum */ | |
104 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
4bcb877d TH |
105 | skb_reset_inner_headers(skb); |
106 | skb->encapsulation = 1; | |
107 | } | |
155e010e TH |
108 | |
109 | skb->mac_len = mac_len; | |
4bcb877d | 110 | skb->protocol = protocol; |
155e010e | 111 | |
dbef491e | 112 | __skb_push(skb, outer_hlen); |
155e010e TH |
113 | skb_reset_mac_header(skb); |
114 | skb_set_network_header(skb, mac_len); | |
115 | skb_set_transport_header(skb, udp_offset); | |
802ab55a | 116 | len = skb->len - udp_offset; |
155e010e | 117 | uh = udp_hdr(skb); |
802ab55a AD |
118 | |
119 | /* If we are only performing partial GSO the inner header | |
120 | * will be using a length value equal to only one MSS sized | |
121 | * segment instead of the entire frame. | |
122 | */ | |
3d0241d5 | 123 | if (gso_partial && skb_is_gso(skb)) { |
802ab55a AD |
124 | uh->len = htons(skb_shinfo(skb)->gso_size + |
125 | SKB_GSO_CB(skb)->data_offset + | |
126 | skb->head - (unsigned char *)uh); | |
127 | } else { | |
128 | uh->len = htons(len); | |
129 | } | |
155e010e | 130 | |
4bcb877d TH |
131 | if (!need_csum) |
132 | continue; | |
133 | ||
802ab55a AD |
134 | uh->check = ~csum_fold(csum_add(partial, |
135 | (__force __wsum)htonl(len))); | |
155e010e | 136 | |
fdaefd62 AD |
137 | if (skb->encapsulation || !offload_csum) { |
138 | uh->check = gso_make_checksum(skb, ~uh->check); | |
155e010e TH |
139 | if (uh->check == 0) |
140 | uh->check = CSUM_MANGLED_0; | |
fdaefd62 AD |
141 | } else { |
142 | skb->ip_summed = CHECKSUM_PARTIAL; | |
143 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
144 | skb->csum_offset = offsetof(struct udphdr, check); | |
155e010e | 145 | } |
155e010e TH |
146 | } while ((skb = skb->next)); |
147 | out: | |
148 | return segs; | |
149 | } | |
150 | ||
8bce6d7d TH |
151 | struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb, |
152 | netdev_features_t features, | |
153 | bool is_ipv6) | |
154 | { | |
155 | __be16 protocol = skb->protocol; | |
156 | const struct net_offload **offloads; | |
157 | const struct net_offload *ops; | |
158 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
159 | struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb, | |
160 | netdev_features_t features); | |
161 | ||
162 | rcu_read_lock(); | |
163 | ||
164 | switch (skb->inner_protocol_type) { | |
165 | case ENCAP_TYPE_ETHER: | |
166 | protocol = skb->inner_protocol; | |
167 | gso_inner_segment = skb_mac_gso_segment; | |
168 | break; | |
169 | case ENCAP_TYPE_IPPROTO: | |
170 | offloads = is_ipv6 ? inet6_offloads : inet_offloads; | |
171 | ops = rcu_dereference(offloads[skb->inner_ipproto]); | |
172 | if (!ops || !ops->callbacks.gso_segment) | |
173 | goto out_unlock; | |
174 | gso_inner_segment = ops->callbacks.gso_segment; | |
175 | break; | |
176 | default: | |
177 | goto out_unlock; | |
178 | } | |
179 | ||
180 | segs = __skb_udp_tunnel_segment(skb, features, gso_inner_segment, | |
4bcb877d | 181 | protocol, is_ipv6); |
8bce6d7d TH |
182 | |
183 | out_unlock: | |
184 | rcu_read_unlock(); | |
185 | ||
186 | return segs; | |
187 | } | |
a6024562 | 188 | EXPORT_SYMBOL(skb_udp_tunnel_segment); |
8bce6d7d | 189 | |
ee80d1eb | 190 | struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb, |
9a0d41b3 | 191 | netdev_features_t features) |
ee80d1eb | 192 | { |
ad405857 WB |
193 | struct sock *sk = gso_skb->sk; |
194 | unsigned int sum_truesize = 0; | |
ee80d1eb | 195 | struct sk_buff *segs, *seg; |
ee80d1eb | 196 | struct udphdr *uh; |
b21c034b | 197 | unsigned int mss; |
04d55b25 | 198 | bool copy_dtor; |
9a0d41b3 AD |
199 | __sum16 check; |
200 | __be16 newlen; | |
ee80d1eb | 201 | |
b21c034b | 202 | mss = skb_shinfo(gso_skb)->gso_size; |
ee80d1eb WB |
203 | if (gso_skb->len <= sizeof(*uh) + mss) |
204 | return ERR_PTR(-EINVAL); | |
205 | ||
ee80d1eb WB |
206 | skb_pull(gso_skb, sizeof(*uh)); |
207 | ||
ad405857 | 208 | /* clear destructor to avoid skb_segment assigning it to tail */ |
04d55b25 AD |
209 | copy_dtor = gso_skb->destructor == sock_wfree; |
210 | if (copy_dtor) | |
211 | gso_skb->destructor = NULL; | |
ad405857 | 212 | |
ee80d1eb | 213 | segs = skb_segment(gso_skb, features); |
ad405857 | 214 | if (unlikely(IS_ERR_OR_NULL(segs))) { |
04d55b25 AD |
215 | if (copy_dtor) |
216 | gso_skb->destructor = sock_wfree; | |
ee80d1eb | 217 | return segs; |
ad405857 | 218 | } |
ee80d1eb | 219 | |
6053d0f1 AD |
220 | /* GSO partial and frag_list segmentation only requires splitting |
221 | * the frame into an MSS multiple and possibly a remainder, both | |
222 | * cases return a GSO skb. So update the mss now. | |
223 | */ | |
224 | if (skb_is_gso(segs)) | |
225 | mss *= skb_shinfo(segs)->gso_segs; | |
226 | ||
0ad65095 AD |
227 | seg = segs; |
228 | uh = udp_hdr(seg); | |
9a0d41b3 AD |
229 | |
230 | /* compute checksum adjustment based on old length versus new */ | |
231 | newlen = htons(sizeof(*uh) + mss); | |
232 | check = csum16_add(csum16_sub(uh->check, uh->len), newlen); | |
233 | ||
0ad65095 | 234 | for (;;) { |
04d55b25 AD |
235 | if (copy_dtor) { |
236 | seg->destructor = sock_wfree; | |
237 | seg->sk = sk; | |
238 | sum_truesize += seg->truesize; | |
239 | } | |
ee80d1eb | 240 | |
0ad65095 AD |
241 | if (!seg->next) |
242 | break; | |
9a0d41b3 AD |
243 | |
244 | uh->len = newlen; | |
245 | uh->check = check; | |
ad405857 | 246 | |
6053d0f1 AD |
247 | if (seg->ip_summed == CHECKSUM_PARTIAL) |
248 | gso_reset_checksum(seg, ~check); | |
249 | else | |
250 | uh->check = gso_make_checksum(seg, ~check) ? : | |
251 | CSUM_MANGLED_0; | |
252 | ||
0ad65095 AD |
253 | seg = seg->next; |
254 | uh = udp_hdr(seg); | |
ee80d1eb WB |
255 | } |
256 | ||
0ad65095 AD |
257 | /* last packet can be partial gso_size, account for that in checksum */ |
258 | newlen = htons(skb_tail_pointer(seg) - skb_transport_header(seg) + | |
259 | seg->data_len); | |
260 | check = csum16_add(csum16_sub(uh->check, uh->len), newlen); | |
261 | ||
262 | uh->len = newlen; | |
263 | uh->check = check; | |
264 | ||
6053d0f1 AD |
265 | if (seg->ip_summed == CHECKSUM_PARTIAL) |
266 | gso_reset_checksum(seg, ~check); | |
267 | else | |
268 | uh->check = gso_make_checksum(seg, ~check) ? : CSUM_MANGLED_0; | |
269 | ||
0ad65095 | 270 | /* update refcount for the packet */ |
575b65bc ED |
271 | if (copy_dtor) { |
272 | int delta = sum_truesize - gso_skb->truesize; | |
273 | ||
274 | /* In some pathological cases, delta can be negative. | |
275 | * We need to either use refcount_add() or refcount_sub_and_test() | |
276 | */ | |
277 | if (likely(delta >= 0)) | |
278 | refcount_add(delta, &sk->sk_wmem_alloc); | |
279 | else | |
280 | WARN_ON_ONCE(refcount_sub_and_test(-delta, &sk->sk_wmem_alloc)); | |
281 | } | |
ee80d1eb WB |
282 | return segs; |
283 | } | |
284 | EXPORT_SYMBOL_GPL(__udp_gso_segment); | |
285 | ||
0c19f846 WB |
286 | static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, |
287 | netdev_features_t features) | |
da5bab07 DB |
288 | { |
289 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
0c19f846 WB |
290 | unsigned int mss; |
291 | __wsum csum; | |
292 | struct udphdr *uh; | |
293 | struct iphdr *iph; | |
7a7ffbab WCC |
294 | |
295 | if (skb->encapsulation && | |
0f4f4ffa | 296 | (skb_shinfo(skb)->gso_type & |
0c19f846 | 297 | (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))) { |
8bce6d7d | 298 | segs = skb_udp_tunnel_segment(skb, features, false); |
0c19f846 WB |
299 | goto out; |
300 | } | |
301 | ||
ee80d1eb | 302 | if (!(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP | SKB_GSO_UDP_L4))) |
121d57af WB |
303 | goto out; |
304 | ||
0c19f846 WB |
305 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
306 | goto out; | |
307 | ||
ee80d1eb | 308 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) |
6053d0f1 | 309 | return __udp_gso_segment(skb, features); |
ee80d1eb | 310 | |
0c19f846 WB |
311 | mss = skb_shinfo(skb)->gso_size; |
312 | if (unlikely(skb->len <= mss)) | |
313 | goto out; | |
314 | ||
315 | /* Do software UFO. Complete and fill in the UDP checksum as | |
316 | * HW cannot do checksum of UDP packets sent as multiple | |
317 | * IP fragments. | |
318 | */ | |
f71470b3 | 319 | |
0c19f846 WB |
320 | uh = udp_hdr(skb); |
321 | iph = ip_hdr(skb); | |
322 | ||
323 | uh->check = 0; | |
324 | csum = skb_checksum(skb, 0, skb->len, 0); | |
325 | uh->check = udp_v4_check(skb->len, iph->saddr, iph->daddr, csum); | |
326 | if (uh->check == 0) | |
327 | uh->check = CSUM_MANGLED_0; | |
328 | ||
329 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
330 | ||
331 | /* If there is no outer header we can fake a checksum offload | |
332 | * due to the fact that we have already done the checksum in | |
333 | * software prior to segmenting the frame. | |
334 | */ | |
335 | if (!skb->encap_hdr_csum) | |
336 | features |= NETIF_F_HW_CSUM; | |
337 | ||
338 | /* Fragment the skb. IP headers of the fragments are updated in | |
339 | * inet_gso_segment() | |
340 | */ | |
341 | segs = skb_segment(skb, features); | |
342 | out: | |
da5bab07 DB |
343 | return segs; |
344 | } | |
345 | ||
d4546c25 DM |
346 | struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb, |
347 | struct udphdr *uh, udp_lookup_t lookup) | |
b582ef09 | 348 | { |
d4546c25 DM |
349 | struct sk_buff *pp = NULL; |
350 | struct sk_buff *p; | |
57c67ff4 TH |
351 | struct udphdr *uh2; |
352 | unsigned int off = skb_gro_offset(skb); | |
b582ef09 | 353 | int flush = 1; |
a6024562 | 354 | struct sock *sk; |
b582ef09 | 355 | |
fac8e0f5 | 356 | if (NAPI_GRO_CB(skb)->encap_mark || |
662880f4 TH |
357 | (skb->ip_summed != CHECKSUM_PARTIAL && |
358 | NAPI_GRO_CB(skb)->csum_cnt == 0 && | |
359 | !NAPI_GRO_CB(skb)->csum_valid)) | |
b582ef09 OG |
360 | goto out; |
361 | ||
fac8e0f5 JG |
362 | /* mark that this skb passed once through the tunnel gro layer */ |
363 | NAPI_GRO_CB(skb)->encap_mark = 1; | |
b582ef09 OG |
364 | |
365 | rcu_read_lock(); | |
a6024562 TH |
366 | sk = (*lookup)(skb, uh->source, uh->dest); |
367 | ||
368 | if (sk && udp_sk(sk)->gro_receive) | |
369 | goto unflush; | |
b582ef09 OG |
370 | goto out_unlock; |
371 | ||
372 | unflush: | |
373 | flush = 0; | |
374 | ||
d4546c25 | 375 | list_for_each_entry(p, head, list) { |
b582ef09 OG |
376 | if (!NAPI_GRO_CB(p)->same_flow) |
377 | continue; | |
378 | ||
379 | uh2 = (struct udphdr *)(p->data + off); | |
57c67ff4 TH |
380 | |
381 | /* Match ports and either checksums are either both zero | |
382 | * or nonzero. | |
383 | */ | |
384 | if ((*(u32 *)&uh->source != *(u32 *)&uh2->source) || | |
385 | (!uh->check ^ !uh2->check)) { | |
b582ef09 OG |
386 | NAPI_GRO_CB(p)->same_flow = 0; |
387 | continue; | |
388 | } | |
389 | } | |
390 | ||
391 | skb_gro_pull(skb, sizeof(struct udphdr)); /* pull encapsulating udp header */ | |
6bae1d4c | 392 | skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr)); |
fcd91dd4 | 393 | pp = call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb); |
b582ef09 OG |
394 | |
395 | out_unlock: | |
396 | rcu_read_unlock(); | |
397 | out: | |
603d4cf8 | 398 | skb_gro_flush_final(skb, pp, flush); |
b582ef09 OG |
399 | return pp; |
400 | } | |
a6024562 | 401 | EXPORT_SYMBOL(udp_gro_receive); |
b582ef09 | 402 | |
d4546c25 DM |
403 | static struct sk_buff *udp4_gro_receive(struct list_head *head, |
404 | struct sk_buff *skb) | |
57c67ff4 TH |
405 | { |
406 | struct udphdr *uh = udp_gro_udphdr(skb); | |
407 | ||
f2e9de21 | 408 | if (unlikely(!uh) || !static_branch_unlikely(&udp_encap_needed_key)) |
2abb7cdc | 409 | goto flush; |
57c67ff4 | 410 | |
2abb7cdc | 411 | /* Don't bother verifying checksum if we're going to flush anyway. */ |
2d8f7e2c | 412 | if (NAPI_GRO_CB(skb)->flush) |
2abb7cdc TH |
413 | goto skip; |
414 | ||
415 | if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check, | |
416 | inet_gro_compute_pseudo)) | |
417 | goto flush; | |
418 | else if (uh->check) | |
419 | skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check, | |
420 | inet_gro_compute_pseudo); | |
421 | skip: | |
efc98d08 | 422 | NAPI_GRO_CB(skb)->is_ipv6 = 0; |
a6024562 | 423 | return udp_gro_receive(head, skb, uh, udp4_lib_lookup_skb); |
2abb7cdc TH |
424 | |
425 | flush: | |
426 | NAPI_GRO_CB(skb)->flush = 1; | |
427 | return NULL; | |
57c67ff4 TH |
428 | } |
429 | ||
a6024562 TH |
430 | int udp_gro_complete(struct sk_buff *skb, int nhoff, |
431 | udp_lookup_t lookup) | |
b582ef09 | 432 | { |
b582ef09 OG |
433 | __be16 newlen = htons(skb->len - nhoff); |
434 | struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); | |
435 | int err = -ENOSYS; | |
a6024562 | 436 | struct sock *sk; |
b582ef09 OG |
437 | |
438 | uh->len = newlen; | |
439 | ||
229740c6 JR |
440 | /* Set encapsulation before calling into inner gro_complete() functions |
441 | * to make them set up the inner offsets. | |
442 | */ | |
443 | skb->encapsulation = 1; | |
444 | ||
b582ef09 | 445 | rcu_read_lock(); |
a6024562 TH |
446 | sk = (*lookup)(skb, uh->source, uh->dest); |
447 | if (sk && udp_sk(sk)->gro_complete) | |
448 | err = udp_sk(sk)->gro_complete(sk, skb, | |
449 | nhoff + sizeof(struct udphdr)); | |
b582ef09 | 450 | rcu_read_unlock(); |
6db93ea1 TH |
451 | |
452 | if (skb->remcsum_offload) | |
453 | skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM; | |
454 | ||
b582ef09 OG |
455 | return err; |
456 | } | |
a6024562 | 457 | EXPORT_SYMBOL(udp_gro_complete); |
b582ef09 | 458 | |
72bb17b3 | 459 | static int udp4_gro_complete(struct sk_buff *skb, int nhoff) |
57c67ff4 TH |
460 | { |
461 | const struct iphdr *iph = ip_hdr(skb); | |
462 | struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); | |
463 | ||
6db93ea1 TH |
464 | if (uh->check) { |
465 | skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; | |
57c67ff4 TH |
466 | uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr, |
467 | iph->daddr, 0); | |
6db93ea1 TH |
468 | } else { |
469 | skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; | |
470 | } | |
57c67ff4 | 471 | |
a6024562 | 472 | return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb); |
57c67ff4 TH |
473 | } |
474 | ||
da5bab07 DB |
475 | static const struct net_offload udpv4_offload = { |
476 | .callbacks = { | |
0c19f846 | 477 | .gso_segment = udp4_ufo_fragment, |
57c67ff4 TH |
478 | .gro_receive = udp4_gro_receive, |
479 | .gro_complete = udp4_gro_complete, | |
da5bab07 DB |
480 | }, |
481 | }; | |
482 | ||
483 | int __init udpv4_offload_init(void) | |
484 | { | |
485 | return inet_add_offload(&udpv4_offload, IPPROTO_UDP); | |
486 | } |