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1da177e4 LT |
1 | #ifndef _INET_ECN_H_ |
2 | #define _INET_ECN_H_ | |
3 | ||
4 | #include <linux/ip.h> | |
5 | #include <net/dsfield.h> | |
6 | ||
7 | enum { | |
8 | INET_ECN_NOT_ECT = 0, | |
9 | INET_ECN_ECT_1 = 1, | |
10 | INET_ECN_ECT_0 = 2, | |
11 | INET_ECN_CE = 3, | |
12 | INET_ECN_MASK = 3, | |
13 | }; | |
14 | ||
15 | static inline int INET_ECN_is_ce(__u8 dsfield) | |
16 | { | |
17 | return (dsfield & INET_ECN_MASK) == INET_ECN_CE; | |
18 | } | |
19 | ||
20 | static inline int INET_ECN_is_not_ect(__u8 dsfield) | |
21 | { | |
22 | return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT; | |
23 | } | |
24 | ||
25 | static inline int INET_ECN_is_capable(__u8 dsfield) | |
26 | { | |
27 | return (dsfield & INET_ECN_ECT_0); | |
28 | } | |
29 | ||
30 | static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner) | |
31 | { | |
32 | outer &= ~INET_ECN_MASK; | |
33 | outer |= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) : | |
34 | INET_ECN_ECT_0; | |
35 | return outer; | |
36 | } | |
37 | ||
38 | #define INET_ECN_xmit(sk) do { inet_sk(sk)->tos |= INET_ECN_ECT_0; } while (0) | |
39 | #define INET_ECN_dontxmit(sk) \ | |
40 | do { inet_sk(sk)->tos &= ~INET_ECN_MASK; } while (0) | |
41 | ||
42 | #define IP6_ECN_flow_init(label) do { \ | |
43 | (label) &= ~htonl(INET_ECN_MASK << 20); \ | |
44 | } while (0) | |
45 | ||
46 | #define IP6_ECN_flow_xmit(sk, label) do { \ | |
47 | if (INET_ECN_is_capable(inet_sk(sk)->tos)) \ | |
48 | (label) |= __constant_htons(INET_ECN_ECT_0 << 4); \ | |
49 | } while (0) | |
50 | ||
51 | static inline void IP_ECN_set_ce(struct iphdr *iph) | |
52 | { | |
53 | u32 check = iph->check; | |
54 | u32 ecn = (iph->tos + 1) & INET_ECN_MASK; | |
55 | ||
56 | /* | |
57 | * After the last operation we have (in binary): | |
58 | * INET_ECN_NOT_ECT => 01 | |
59 | * INET_ECN_ECT_1 => 10 | |
60 | * INET_ECN_ECT_0 => 11 | |
61 | * INET_ECN_CE => 00 | |
62 | */ | |
63 | if (!(ecn & 2)) | |
64 | return; | |
65 | ||
66 | /* | |
67 | * The following gives us: | |
68 | * INET_ECN_ECT_1 => check += htons(0xFFFD) | |
69 | * INET_ECN_ECT_0 => check += htons(0xFFFE) | |
70 | */ | |
71 | check += htons(0xFFFB) + htons(ecn); | |
72 | ||
73 | iph->check = check + (check>=0xFFFF); | |
74 | iph->tos |= INET_ECN_CE; | |
75 | } | |
76 | ||
77 | static inline void IP_ECN_clear(struct iphdr *iph) | |
78 | { | |
79 | iph->tos &= ~INET_ECN_MASK; | |
80 | } | |
81 | ||
82 | static inline void ipv4_copy_dscp(struct iphdr *outer, struct iphdr *inner) | |
83 | { | |
84 | u32 dscp = ipv4_get_dsfield(outer) & ~INET_ECN_MASK; | |
85 | ipv4_change_dsfield(inner, INET_ECN_MASK, dscp); | |
86 | } | |
87 | ||
88 | struct ipv6hdr; | |
89 | ||
90 | static inline void IP6_ECN_set_ce(struct ipv6hdr *iph) | |
91 | { | |
92 | if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph))) | |
93 | return; | |
94 | *(u32*)iph |= htonl(INET_ECN_CE << 20); | |
95 | } | |
96 | ||
97 | static inline void IP6_ECN_clear(struct ipv6hdr *iph) | |
98 | { | |
99 | *(u32*)iph &= ~htonl(INET_ECN_MASK << 20); | |
100 | } | |
101 | ||
102 | static inline void ipv6_copy_dscp(struct ipv6hdr *outer, struct ipv6hdr *inner) | |
103 | { | |
104 | u32 dscp = ipv6_get_dsfield(outer) & ~INET_ECN_MASK; | |
105 | ipv6_change_dsfield(inner, INET_ECN_MASK, dscp); | |
106 | } | |
107 | ||
108 | #endif |