projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |