thermal: fix Mediatek thermal controller build
[linux/fpc-iii.git] / net / ipv6 / ip6_offload.c
blob82e9f30760283aca2f3d9468573aea607bd5bf6b
1 /*
2 * IPV6 GSO/GRO offload support
3 * Linux INET6 implementation
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 */
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>
17 #include <net/protocol.h>
18 #include <net/ipv6.h>
20 #include "ip6_offload.h"
22 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
24 const struct net_offload *ops = NULL;
26 for (;;) {
27 struct ipv6_opt_hdr *opth;
28 int len;
30 if (proto != NEXTHDR_HOP) {
31 ops = rcu_dereference(inet6_offloads[proto]);
33 if (unlikely(!ops))
34 break;
36 if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
37 break;
40 if (unlikely(!pskb_may_pull(skb, 8)))
41 break;
43 opth = (void *)skb->data;
44 len = ipv6_optlen(opth);
46 if (unlikely(!pskb_may_pull(skb, len)))
47 break;
49 opth = (void *)skb->data;
50 proto = opth->nexthdr;
51 __skb_pull(skb, len);
54 return proto;
57 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
58 netdev_features_t features)
60 struct sk_buff *segs = ERR_PTR(-EINVAL);
61 struct ipv6hdr *ipv6h;
62 const struct net_offload *ops;
63 int proto;
64 struct frag_hdr *fptr;
65 unsigned int unfrag_ip6hlen;
66 u8 *prevhdr;
67 int offset = 0;
68 bool encap, udpfrag;
69 int nhoff;
71 if (unlikely(skb_shinfo(skb)->gso_type &
72 ~(SKB_GSO_TCPV4 |
73 SKB_GSO_UDP |
74 SKB_GSO_DODGY |
75 SKB_GSO_TCP_ECN |
76 SKB_GSO_GRE |
77 SKB_GSO_GRE_CSUM |
78 SKB_GSO_IPIP |
79 SKB_GSO_SIT |
80 SKB_GSO_UDP_TUNNEL |
81 SKB_GSO_UDP_TUNNEL_CSUM |
82 SKB_GSO_TUNNEL_REMCSUM |
83 SKB_GSO_TCPV6 |
84 0)))
85 goto out;
87 skb_reset_network_header(skb);
88 nhoff = skb_network_header(skb) - skb_mac_header(skb);
89 if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
90 goto out;
92 encap = SKB_GSO_CB(skb)->encap_level > 0;
93 if (encap)
94 features &= skb->dev->hw_enc_features;
95 SKB_GSO_CB(skb)->encap_level += sizeof(*ipv6h);
97 ipv6h = ipv6_hdr(skb);
98 __skb_pull(skb, sizeof(*ipv6h));
99 segs = ERR_PTR(-EPROTONOSUPPORT);
101 proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
103 if (skb->encapsulation &&
104 skb_shinfo(skb)->gso_type & (SKB_GSO_SIT|SKB_GSO_IPIP))
105 udpfrag = proto == IPPROTO_UDP && encap;
106 else
107 udpfrag = proto == IPPROTO_UDP && !skb->encapsulation;
109 ops = rcu_dereference(inet6_offloads[proto]);
110 if (likely(ops && ops->callbacks.gso_segment)) {
111 skb_reset_transport_header(skb);
112 segs = ops->callbacks.gso_segment(skb, features);
115 if (IS_ERR(segs))
116 goto out;
118 for (skb = segs; skb; skb = skb->next) {
119 ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff);
120 ipv6h->payload_len = htons(skb->len - nhoff - sizeof(*ipv6h));
121 skb->network_header = (u8 *)ipv6h - skb->head;
123 if (udpfrag) {
124 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
125 fptr = (struct frag_hdr *)((u8 *)ipv6h + unfrag_ip6hlen);
126 fptr->frag_off = htons(offset);
127 if (skb->next)
128 fptr->frag_off |= htons(IP6_MF);
129 offset += (ntohs(ipv6h->payload_len) -
130 sizeof(struct frag_hdr));
132 if (encap)
133 skb_reset_inner_headers(skb);
136 out:
137 return segs;
140 /* Return the total length of all the extension hdrs, following the same
141 * logic in ipv6_gso_pull_exthdrs() when parsing ext-hdrs.
143 static int ipv6_exthdrs_len(struct ipv6hdr *iph,
144 const struct net_offload **opps)
146 struct ipv6_opt_hdr *opth = (void *)iph;
147 int len = 0, proto, optlen = sizeof(*iph);
149 proto = iph->nexthdr;
150 for (;;) {
151 if (proto != NEXTHDR_HOP) {
152 *opps = rcu_dereference(inet6_offloads[proto]);
153 if (unlikely(!(*opps)))
154 break;
155 if (!((*opps)->flags & INET6_PROTO_GSO_EXTHDR))
156 break;
158 opth = (void *)opth + optlen;
159 optlen = ipv6_optlen(opth);
160 len += optlen;
161 proto = opth->nexthdr;
163 return len;
166 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
167 struct sk_buff *skb)
169 const struct net_offload *ops;
170 struct sk_buff **pp = NULL;
171 struct sk_buff *p;
172 struct ipv6hdr *iph;
173 unsigned int nlen;
174 unsigned int hlen;
175 unsigned int off;
176 u16 flush = 1;
177 int proto;
179 off = skb_gro_offset(skb);
180 hlen = off + sizeof(*iph);
181 iph = skb_gro_header_fast(skb, off);
182 if (skb_gro_header_hard(skb, hlen)) {
183 iph = skb_gro_header_slow(skb, hlen, off);
184 if (unlikely(!iph))
185 goto out;
188 skb_set_network_header(skb, off);
189 skb_gro_pull(skb, sizeof(*iph));
190 skb_set_transport_header(skb, skb_gro_offset(skb));
192 flush += ntohs(iph->payload_len) != skb_gro_len(skb);
194 rcu_read_lock();
195 proto = iph->nexthdr;
196 ops = rcu_dereference(inet6_offloads[proto]);
197 if (!ops || !ops->callbacks.gro_receive) {
198 __pskb_pull(skb, skb_gro_offset(skb));
199 proto = ipv6_gso_pull_exthdrs(skb, proto);
200 skb_gro_pull(skb, -skb_transport_offset(skb));
201 skb_reset_transport_header(skb);
202 __skb_push(skb, skb_gro_offset(skb));
204 ops = rcu_dereference(inet6_offloads[proto]);
205 if (!ops || !ops->callbacks.gro_receive)
206 goto out_unlock;
208 iph = ipv6_hdr(skb);
211 NAPI_GRO_CB(skb)->proto = proto;
213 flush--;
214 nlen = skb_network_header_len(skb);
216 for (p = *head; p; p = p->next) {
217 const struct ipv6hdr *iph2;
218 __be32 first_word; /* <Version:4><Traffic_Class:8><Flow_Label:20> */
220 if (!NAPI_GRO_CB(p)->same_flow)
221 continue;
223 iph2 = (struct ipv6hdr *)(p->data + off);
224 first_word = *(__be32 *)iph ^ *(__be32 *)iph2;
226 /* All fields must match except length and Traffic Class.
227 * XXX skbs on the gro_list have all been parsed and pulled
228 * already so we don't need to compare nlen
229 * (nlen != (sizeof(*iph2) + ipv6_exthdrs_len(iph2, &ops)))
230 * memcmp() alone below is suffcient, right?
232 if ((first_word & htonl(0xF00FFFFF)) ||
233 memcmp(&iph->nexthdr, &iph2->nexthdr,
234 nlen - offsetof(struct ipv6hdr, nexthdr))) {
235 NAPI_GRO_CB(p)->same_flow = 0;
236 continue;
238 /* flush if Traffic Class fields are different */
239 NAPI_GRO_CB(p)->flush |= !!(first_word & htonl(0x0FF00000));
240 NAPI_GRO_CB(p)->flush |= flush;
242 /* Clear flush_id, there's really no concept of ID in IPv6. */
243 NAPI_GRO_CB(p)->flush_id = 0;
246 NAPI_GRO_CB(skb)->flush |= flush;
248 skb_gro_postpull_rcsum(skb, iph, nlen);
250 pp = ops->callbacks.gro_receive(head, skb);
252 out_unlock:
253 rcu_read_unlock();
255 out:
256 NAPI_GRO_CB(skb)->flush |= flush;
258 return pp;
261 static struct sk_buff **sit_gro_receive(struct sk_buff **head,
262 struct sk_buff *skb)
264 if (NAPI_GRO_CB(skb)->encap_mark) {
265 NAPI_GRO_CB(skb)->flush = 1;
266 return NULL;
269 NAPI_GRO_CB(skb)->encap_mark = 1;
271 return ipv6_gro_receive(head, skb);
274 static int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
276 const struct net_offload *ops;
277 struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + nhoff);
278 int err = -ENOSYS;
280 if (skb->encapsulation)
281 skb_set_inner_network_header(skb, nhoff);
283 iph->payload_len = htons(skb->len - nhoff - sizeof(*iph));
285 rcu_read_lock();
287 nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
288 if (WARN_ON(!ops || !ops->callbacks.gro_complete))
289 goto out_unlock;
291 err = ops->callbacks.gro_complete(skb, nhoff);
293 out_unlock:
294 rcu_read_unlock();
296 return err;
299 static int sit_gro_complete(struct sk_buff *skb, int nhoff)
301 skb->encapsulation = 1;
302 skb_shinfo(skb)->gso_type |= SKB_GSO_SIT;
303 return ipv6_gro_complete(skb, nhoff);
306 static struct packet_offload ipv6_packet_offload __read_mostly = {
307 .type = cpu_to_be16(ETH_P_IPV6),
308 .callbacks = {
309 .gso_segment = ipv6_gso_segment,
310 .gro_receive = ipv6_gro_receive,
311 .gro_complete = ipv6_gro_complete,
315 static const struct net_offload sit_offload = {
316 .callbacks = {
317 .gso_segment = ipv6_gso_segment,
318 .gro_receive = sit_gro_receive,
319 .gro_complete = sit_gro_complete,
323 static int __init ipv6_offload_init(void)
326 if (tcpv6_offload_init() < 0)
327 pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
328 if (udp_offload_init() < 0)
329 pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
330 if (ipv6_exthdrs_offload_init() < 0)
331 pr_crit("%s: Cannot add EXTHDRS protocol offload\n", __func__);
333 dev_add_offload(&ipv6_packet_offload);
335 inet_add_offload(&sit_offload, IPPROTO_IPV6);
337 return 0;
340 fs_initcall(ipv6_offload_init);