This source file includes following definitions.
- INET_ECN_is_ce
- INET_ECN_is_not_ect
- INET_ECN_is_capable
- INET_ECN_encapsulate
- INET_ECN_xmit
- INET_ECN_dontxmit
- IP_ECN_set_ce
- IP_ECN_set_ect1
- IP_ECN_clear
- ipv4_copy_dscp
- IP6_ECN_set_ce
- IP6_ECN_set_ect1
- ipv6_copy_dscp
- INET_ECN_set_ce
- INET_ECN_set_ect1
- __INET_ECN_decapsulate
- INET_ECN_decapsulate
- IP_ECN_decapsulate
- IP6_ECN_decapsulate
1
2 #ifndef _INET_ECN_H_
3 #define _INET_ECN_H_
4
5 #include <linux/ip.h>
6 #include <linux/skbuff.h>
7
8 #include <net/inet_sock.h>
9 #include <net/dsfield.h>
10
11 enum {
12 INET_ECN_NOT_ECT = 0,
13 INET_ECN_ECT_1 = 1,
14 INET_ECN_ECT_0 = 2,
15 INET_ECN_CE = 3,
16 INET_ECN_MASK = 3,
17 };
18
19 extern int sysctl_tunnel_ecn_log;
20
21 static inline int INET_ECN_is_ce(__u8 dsfield)
22 {
23 return (dsfield & INET_ECN_MASK) == INET_ECN_CE;
24 }
25
26 static inline int INET_ECN_is_not_ect(__u8 dsfield)
27 {
28 return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT;
29 }
30
31 static inline int INET_ECN_is_capable(__u8 dsfield)
32 {
33 return dsfield & INET_ECN_ECT_0;
34 }
35
36
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42
43
44 static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
45 {
46 outer &= ~INET_ECN_MASK;
47 outer |= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) :
48 INET_ECN_ECT_0;
49 return outer;
50 }
51
52 static inline void INET_ECN_xmit(struct sock *sk)
53 {
54 inet_sk(sk)->tos |= INET_ECN_ECT_0;
55 if (inet6_sk(sk) != NULL)
56 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
57 }
58
59 static inline void INET_ECN_dontxmit(struct sock *sk)
60 {
61 inet_sk(sk)->tos &= ~INET_ECN_MASK;
62 if (inet6_sk(sk) != NULL)
63 inet6_sk(sk)->tclass &= ~INET_ECN_MASK;
64 }
65
66 #define IP6_ECN_flow_init(label) do { \
67 (label) &= ~htonl(INET_ECN_MASK << 20); \
68 } while (0)
69
70 #define IP6_ECN_flow_xmit(sk, label) do { \
71 if (INET_ECN_is_capable(inet6_sk(sk)->tclass)) \
72 (label) |= htonl(INET_ECN_ECT_0 << 20); \
73 } while (0)
74
75 static inline int IP_ECN_set_ce(struct iphdr *iph)
76 {
77 u32 check = (__force u32)iph->check;
78 u32 ecn = (iph->tos + 1) & INET_ECN_MASK;
79
80
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84
85
86
87 if (!(ecn & 2))
88 return !ecn;
89
90
91
92
93
94
95 check += (__force u16)htons(0xFFFB) + (__force u16)htons(ecn);
96
97 iph->check = (__force __sum16)(check + (check>=0xFFFF));
98 iph->tos |= INET_ECN_CE;
99 return 1;
100 }
101
102 static inline int IP_ECN_set_ect1(struct iphdr *iph)
103 {
104 u32 check = (__force u32)iph->check;
105
106 if ((iph->tos & INET_ECN_MASK) != INET_ECN_ECT_0)
107 return 0;
108
109 check += (__force u16)htons(0x100);
110
111 iph->check = (__force __sum16)(check + (check>=0xFFFF));
112 iph->tos ^= INET_ECN_MASK;
113 return 1;
114 }
115
116 static inline void IP_ECN_clear(struct iphdr *iph)
117 {
118 iph->tos &= ~INET_ECN_MASK;
119 }
120
121 static inline void ipv4_copy_dscp(unsigned int dscp, struct iphdr *inner)
122 {
123 dscp &= ~INET_ECN_MASK;
124 ipv4_change_dsfield(inner, INET_ECN_MASK, dscp);
125 }
126
127 struct ipv6hdr;
128
129
130
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132
133
134
135 static inline int IP6_ECN_set_ce(struct sk_buff *skb, struct ipv6hdr *iph)
136 {
137 __be32 from, to;
138
139 if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
140 return 0;
141
142 from = *(__be32 *)iph;
143 to = from | htonl(INET_ECN_CE << 20);
144 *(__be32 *)iph = to;
145 if (skb->ip_summed == CHECKSUM_COMPLETE)
146 skb->csum = csum_add(csum_sub(skb->csum, (__force __wsum)from),
147 (__force __wsum)to);
148 return 1;
149 }
150
151 static inline int IP6_ECN_set_ect1(struct sk_buff *skb, struct ipv6hdr *iph)
152 {
153 __be32 from, to;
154
155 if ((ipv6_get_dsfield(iph) & INET_ECN_MASK) != INET_ECN_ECT_0)
156 return 0;
157
158 from = *(__be32 *)iph;
159 to = from ^ htonl(INET_ECN_MASK << 20);
160 *(__be32 *)iph = to;
161 if (skb->ip_summed == CHECKSUM_COMPLETE)
162 skb->csum = csum_add(csum_sub(skb->csum, (__force __wsum)from),
163 (__force __wsum)to);
164 return 1;
165 }
166
167 static inline void ipv6_copy_dscp(unsigned int dscp, struct ipv6hdr *inner)
168 {
169 dscp &= ~INET_ECN_MASK;
170 ipv6_change_dsfield(inner, INET_ECN_MASK, dscp);
171 }
172
173 static inline int INET_ECN_set_ce(struct sk_buff *skb)
174 {
175 switch (skb->protocol) {
176 case cpu_to_be16(ETH_P_IP):
177 if (skb_network_header(skb) + sizeof(struct iphdr) <=
178 skb_tail_pointer(skb))
179 return IP_ECN_set_ce(ip_hdr(skb));
180 break;
181
182 case cpu_to_be16(ETH_P_IPV6):
183 if (skb_network_header(skb) + sizeof(struct ipv6hdr) <=
184 skb_tail_pointer(skb))
185 return IP6_ECN_set_ce(skb, ipv6_hdr(skb));
186 break;
187 }
188
189 return 0;
190 }
191
192 static inline int INET_ECN_set_ect1(struct sk_buff *skb)
193 {
194 switch (skb->protocol) {
195 case cpu_to_be16(ETH_P_IP):
196 if (skb_network_header(skb) + sizeof(struct iphdr) <=
197 skb_tail_pointer(skb))
198 return IP_ECN_set_ect1(ip_hdr(skb));
199 break;
200
201 case cpu_to_be16(ETH_P_IPV6):
202 if (skb_network_header(skb) + sizeof(struct ipv6hdr) <=
203 skb_tail_pointer(skb))
204 return IP6_ECN_set_ect1(skb, ipv6_hdr(skb));
205 break;
206 }
207
208 return 0;
209 }
210
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234
235 static inline int __INET_ECN_decapsulate(__u8 outer, __u8 inner, bool *set_ce)
236 {
237 if (INET_ECN_is_not_ect(inner)) {
238 switch (outer & INET_ECN_MASK) {
239 case INET_ECN_NOT_ECT:
240 return 0;
241 case INET_ECN_ECT_0:
242 case INET_ECN_ECT_1:
243 return 1;
244 case INET_ECN_CE:
245 return 2;
246 }
247 }
248
249 *set_ce = INET_ECN_is_ce(outer);
250 return 0;
251 }
252
253 static inline int INET_ECN_decapsulate(struct sk_buff *skb,
254 __u8 outer, __u8 inner)
255 {
256 bool set_ce = false;
257 int rc;
258
259 rc = __INET_ECN_decapsulate(outer, inner, &set_ce);
260 if (!rc) {
261 if (set_ce)
262 INET_ECN_set_ce(skb);
263 else if ((outer & INET_ECN_MASK) == INET_ECN_ECT_1)
264 INET_ECN_set_ect1(skb);
265 }
266
267 return rc;
268 }
269
270 static inline int IP_ECN_decapsulate(const struct iphdr *oiph,
271 struct sk_buff *skb)
272 {
273 __u8 inner;
274
275 if (skb->protocol == htons(ETH_P_IP))
276 inner = ip_hdr(skb)->tos;
277 else if (skb->protocol == htons(ETH_P_IPV6))
278 inner = ipv6_get_dsfield(ipv6_hdr(skb));
279 else
280 return 0;
281
282 return INET_ECN_decapsulate(skb, oiph->tos, inner);
283 }
284
285 static inline int IP6_ECN_decapsulate(const struct ipv6hdr *oipv6h,
286 struct sk_buff *skb)
287 {
288 __u8 inner;
289
290 if (skb->protocol == htons(ETH_P_IP))
291 inner = ip_hdr(skb)->tos;
292 else if (skb->protocol == htons(ETH_P_IPV6))
293 inner = ipv6_get_dsfield(ipv6_hdr(skb));
294 else
295 return 0;
296
297 return INET_ECN_decapsulate(skb, ipv6_get_dsfield(oipv6h), inner);
298 }
299 #endif