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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 | |
22 | static 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 | |
56 | static 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 | |
77 | out: |
78 | return err; |
79 | } |
80 | |
81 | static 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 | |
157 | out: |
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 | */ |
164 | static 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 | |
187 | static 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 | |
270 | out_unlock: |
271 | rcu_read_unlock(); |
272 | |
273 | out: |
274 | NAPI_GRO_CB(skb)->flush |= flush; |
275 | |
276 | return pp; |
277 | } |
278 | |
279 | static 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 | |
295 | out_unlock: |
296 | rcu_read_unlock(); |
297 | |
298 | return err; |
299 | } |
300 | |
301 | static 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 | |
311 | static 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 | |
318 | static 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 | |
335 | fs_initcall(ipv6_offload_init); |
336 |
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