Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _INET_ECN_H_ |
| 2 | #define _INET_ECN_H_ |
| 3 | |
| 4 | #include <linux/ip.h> |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 5 | #include <linux/skbuff.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 6 | |
| 7 | #include <net/inet_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <net/dsfield.h> |
| 9 | |
| 10 | enum { |
| 11 | INET_ECN_NOT_ECT = 0, |
| 12 | INET_ECN_ECT_1 = 1, |
| 13 | INET_ECN_ECT_0 = 2, |
| 14 | INET_ECN_CE = 3, |
| 15 | INET_ECN_MASK = 3, |
| 16 | }; |
| 17 | |
| 18 | static inline int INET_ECN_is_ce(__u8 dsfield) |
| 19 | { |
| 20 | return (dsfield & INET_ECN_MASK) == INET_ECN_CE; |
| 21 | } |
| 22 | |
| 23 | static inline int INET_ECN_is_not_ect(__u8 dsfield) |
| 24 | { |
| 25 | return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT; |
| 26 | } |
| 27 | |
| 28 | static inline int INET_ECN_is_capable(__u8 dsfield) |
| 29 | { |
| 30 | return (dsfield & INET_ECN_ECT_0); |
| 31 | } |
| 32 | |
| 33 | static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner) |
| 34 | { |
| 35 | outer &= ~INET_ECN_MASK; |
| 36 | outer |= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) : |
| 37 | INET_ECN_ECT_0; |
| 38 | return outer; |
| 39 | } |
| 40 | |
| 41 | #define INET_ECN_xmit(sk) do { inet_sk(sk)->tos |= INET_ECN_ECT_0; } while (0) |
| 42 | #define INET_ECN_dontxmit(sk) \ |
| 43 | do { inet_sk(sk)->tos &= ~INET_ECN_MASK; } while (0) |
| 44 | |
| 45 | #define IP6_ECN_flow_init(label) do { \ |
| 46 | (label) &= ~htonl(INET_ECN_MASK << 20); \ |
| 47 | } while (0) |
| 48 | |
| 49 | #define IP6_ECN_flow_xmit(sk, label) do { \ |
YOSHIFUJI Hideaki | e9df2e8 | 2008-04-13 23:40:51 -0700 | [diff] [blame] | 50 | if (INET_ECN_is_capable(inet6_sk(sk)->tclass)) \ |
Al Viro | 95026cd | 2006-11-03 00:55:35 -0800 | [diff] [blame] | 51 | (label) |= htonl(INET_ECN_ECT_0 << 20); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | } while (0) |
| 53 | |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 54 | static inline int IP_ECN_set_ce(struct iphdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | { |
Al Viro | 5c78f27 | 2006-11-14 21:42:26 -0800 | [diff] [blame] | 56 | u32 check = (__force u32)iph->check; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | u32 ecn = (iph->tos + 1) & INET_ECN_MASK; |
| 58 | |
| 59 | /* |
| 60 | * After the last operation we have (in binary): |
| 61 | * INET_ECN_NOT_ECT => 01 |
| 62 | * INET_ECN_ECT_1 => 10 |
| 63 | * INET_ECN_ECT_0 => 11 |
| 64 | * INET_ECN_CE => 00 |
| 65 | */ |
| 66 | if (!(ecn & 2)) |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 67 | return !ecn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | /* |
| 70 | * The following gives us: |
| 71 | * INET_ECN_ECT_1 => check += htons(0xFFFD) |
| 72 | * INET_ECN_ECT_0 => check += htons(0xFFFE) |
| 73 | */ |
Al Viro | 5c78f27 | 2006-11-14 21:42:26 -0800 | [diff] [blame] | 74 | check += (__force u16)htons(0xFFFB) + (__force u16)htons(ecn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
Al Viro | 5c78f27 | 2006-11-14 21:42:26 -0800 | [diff] [blame] | 76 | iph->check = (__force __sum16)(check + (check>=0xFFFF)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | iph->tos |= INET_ECN_CE; |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 78 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | static inline void IP_ECN_clear(struct iphdr *iph) |
| 82 | { |
| 83 | iph->tos &= ~INET_ECN_MASK; |
| 84 | } |
| 85 | |
Herbert Xu | 29bb43b | 2007-11-13 21:40:13 -0800 | [diff] [blame] | 86 | static inline void ipv4_copy_dscp(unsigned int dscp, struct iphdr *inner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
Herbert Xu | 29bb43b | 2007-11-13 21:40:13 -0800 | [diff] [blame] | 88 | dscp &= ~INET_ECN_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | ipv4_change_dsfield(inner, INET_ECN_MASK, dscp); |
| 90 | } |
| 91 | |
| 92 | struct ipv6hdr; |
| 93 | |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 94 | static inline int IP6_ECN_set_ce(struct ipv6hdr *iph) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
| 96 | if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph))) |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 97 | return 0; |
Al Viro | 92d9ece | 2006-11-08 00:24:47 -0800 | [diff] [blame] | 98 | *(__be32*)iph |= htonl(INET_ECN_CE << 20); |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 99 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | static inline void IP6_ECN_clear(struct ipv6hdr *iph) |
| 103 | { |
Al Viro | 92d9ece | 2006-11-08 00:24:47 -0800 | [diff] [blame] | 104 | *(__be32*)iph &= ~htonl(INET_ECN_MASK << 20); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
Herbert Xu | 29bb43b | 2007-11-13 21:40:13 -0800 | [diff] [blame] | 107 | static inline void ipv6_copy_dscp(unsigned int dscp, struct ipv6hdr *inner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
Herbert Xu | 29bb43b | 2007-11-13 21:40:13 -0800 | [diff] [blame] | 109 | dscp &= ~INET_ECN_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | ipv6_change_dsfield(inner, INET_ECN_MASK, dscp); |
| 111 | } |
| 112 | |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 113 | static inline int INET_ECN_set_ce(struct sk_buff *skb) |
| 114 | { |
| 115 | switch (skb->protocol) { |
| 116 | case __constant_htons(ETH_P_IP): |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 117 | if (skb->network_header + sizeof(struct iphdr) <= skb->tail) |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 118 | return IP_ECN_set_ce(ip_hdr(skb)); |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 119 | break; |
| 120 | |
| 121 | case __constant_htons(ETH_P_IPV6): |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 122 | if (skb->network_header + sizeof(struct ipv6hdr) <= skb->tail) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 123 | return IP6_ECN_set_ce(ipv6_hdr(skb)); |
Thomas Graf | 2566a50 | 2005-11-05 21:14:04 +0100 | [diff] [blame] | 124 | break; |
| 125 | } |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | #endif |