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1#ifndef _INET_ECN_H_
2#define _INET_ECN_H_
3
4#include <linux/ip.h>
5#include <linux/skbuff.h>
6
7#include <net/inet_sock.h>
8#include <net/dsfield.h>
9
10enum {
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
18static inline int INET_ECN_is_ce(__u8 dsfield)
19{
20 return (dsfield & INET_ECN_MASK) == INET_ECN_CE;
21}
22
23static inline int INET_ECN_is_not_ect(__u8 dsfield)
24{
25 return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT;
26}
27
28static inline int INET_ECN_is_capable(__u8 dsfield)
29{
30 return dsfield & INET_ECN_ECT_0;
31}
32
33static 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
41static inline void INET_ECN_xmit(struct sock *sk)
42{
43 inet_sk(sk)->tos |= INET_ECN_ECT_0;
44 if (inet6_sk(sk) != NULL)
45 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
46}
47
48static inline void INET_ECN_dontxmit(struct sock *sk)
49{
50 inet_sk(sk)->tos &= ~INET_ECN_MASK;
51 if (inet6_sk(sk) != NULL)
52 inet6_sk(sk)->tclass &= ~INET_ECN_MASK;
53}
54
55#define IP6_ECN_flow_init(label) do { \
56 (label) &= ~htonl(INET_ECN_MASK << 20); \
57 } while (0)
58
59#define IP6_ECN_flow_xmit(sk, label) do { \
60 if (INET_ECN_is_capable(inet6_sk(sk)->tclass)) \
61 (label) |= htonl(INET_ECN_ECT_0 << 20); \
62 } while (0)
63
64static inline int IP_ECN_set_ce(struct iphdr *iph)
65{
66 u32 check = (__force u32)iph->check;
67 u32 ecn = (iph->tos + 1) & INET_ECN_MASK;
68
69 /*
70 * After the last operation we have (in binary):
71 * INET_ECN_NOT_ECT => 01
72 * INET_ECN_ECT_1 => 10
73 * INET_ECN_ECT_0 => 11
74 * INET_ECN_CE => 00
75 */
76 if (!(ecn & 2))
77 return !ecn;
78
79 /*
80 * The following gives us:
81 * INET_ECN_ECT_1 => check += htons(0xFFFD)
82 * INET_ECN_ECT_0 => check += htons(0xFFFE)
83 */
84 check += (__force u16)htons(0xFFFB) + (__force u16)htons(ecn);
85
86 iph->check = (__force __sum16)(check + (check>=0xFFFF));
87 iph->tos |= INET_ECN_CE;
88 return 1;
89}
90
91static inline void IP_ECN_clear(struct iphdr *iph)
92{
93 iph->tos &= ~INET_ECN_MASK;
94}
95
96static inline void ipv4_copy_dscp(unsigned int dscp, struct iphdr *inner)
97{
98 dscp &= ~INET_ECN_MASK;
99 ipv4_change_dsfield(inner, INET_ECN_MASK, dscp);
100}
101
102struct ipv6hdr;
103
104static inline int IP6_ECN_set_ce(struct ipv6hdr *iph)
105{
106 if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
107 return 0;
108 *(__be32*)iph |= htonl(INET_ECN_CE << 20);
109 return 1;
110}
111
112static inline void IP6_ECN_clear(struct ipv6hdr *iph)
113{
114 *(__be32*)iph &= ~htonl(INET_ECN_MASK << 20);
115}
116
117static inline void ipv6_copy_dscp(unsigned int dscp, struct ipv6hdr *inner)
118{
119 dscp &= ~INET_ECN_MASK;
120 ipv6_change_dsfield(inner, INET_ECN_MASK, dscp);
121}
122
123static inline int INET_ECN_set_ce(struct sk_buff *skb)
124{
125 switch (skb->protocol) {
126 case cpu_to_be16(ETH_P_IP):
127 if (skb->network_header + sizeof(struct iphdr) <= skb->tail)
128 return IP_ECN_set_ce(ip_hdr(skb));
129 break;
130
131 case cpu_to_be16(ETH_P_IPV6):
132 if (skb->network_header + sizeof(struct ipv6hdr) <= skb->tail)
133 return IP6_ECN_set_ce(ipv6_hdr(skb));
134 break;
135 }
136
137 return 0;
138}
139
140#endif
1#ifndef _INET_ECN_H_
2#define _INET_ECN_H_
3
4#include <linux/ip.h>
5#include <linux/skbuff.h>
6
7#include <net/inet_sock.h>
8#include <net/dsfield.h>
9
10enum {
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
18static inline int INET_ECN_is_ce(__u8 dsfield)
19{
20 return (dsfield & INET_ECN_MASK) == INET_ECN_CE;
21}
22
23static inline int INET_ECN_is_not_ect(__u8 dsfield)
24{
25 return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT;
26}
27
28static inline int INET_ECN_is_capable(__u8 dsfield)
29{
30 return dsfield & INET_ECN_ECT_0;
31}
32
33/*
34 * RFC 3168 9.1.1
35 * The full-functionality option for ECN encapsulation is to copy the
36 * ECN codepoint of the inside header to the outside header on
37 * encapsulation if the inside header is not-ECT or ECT, and to set the
38 * ECN codepoint of the outside header to ECT(0) if the ECN codepoint of
39 * the inside header is CE.
40 */
41static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
42{
43 outer &= ~INET_ECN_MASK;
44 outer |= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) :
45 INET_ECN_ECT_0;
46 return outer;
47}
48
49static inline void INET_ECN_xmit(struct sock *sk)
50{
51 inet_sk(sk)->tos |= INET_ECN_ECT_0;
52 if (inet6_sk(sk) != NULL)
53 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
54}
55
56static inline void INET_ECN_dontxmit(struct sock *sk)
57{
58 inet_sk(sk)->tos &= ~INET_ECN_MASK;
59 if (inet6_sk(sk) != NULL)
60 inet6_sk(sk)->tclass &= ~INET_ECN_MASK;
61}
62
63#define IP6_ECN_flow_init(label) do { \
64 (label) &= ~htonl(INET_ECN_MASK << 20); \
65 } while (0)
66
67#define IP6_ECN_flow_xmit(sk, label) do { \
68 if (INET_ECN_is_capable(inet6_sk(sk)->tclass)) \
69 (label) |= htonl(INET_ECN_ECT_0 << 20); \
70 } while (0)
71
72static inline int IP_ECN_set_ce(struct iphdr *iph)
73{
74 u32 check = (__force u32)iph->check;
75 u32 ecn = (iph->tos + 1) & INET_ECN_MASK;
76
77 /*
78 * After the last operation we have (in binary):
79 * INET_ECN_NOT_ECT => 01
80 * INET_ECN_ECT_1 => 10
81 * INET_ECN_ECT_0 => 11
82 * INET_ECN_CE => 00
83 */
84 if (!(ecn & 2))
85 return !ecn;
86
87 /*
88 * The following gives us:
89 * INET_ECN_ECT_1 => check += htons(0xFFFD)
90 * INET_ECN_ECT_0 => check += htons(0xFFFE)
91 */
92 check += (__force u16)htons(0xFFFB) + (__force u16)htons(ecn);
93
94 iph->check = (__force __sum16)(check + (check>=0xFFFF));
95 iph->tos |= INET_ECN_CE;
96 return 1;
97}
98
99static inline void IP_ECN_clear(struct iphdr *iph)
100{
101 iph->tos &= ~INET_ECN_MASK;
102}
103
104static inline void ipv4_copy_dscp(unsigned int dscp, struct iphdr *inner)
105{
106 dscp &= ~INET_ECN_MASK;
107 ipv4_change_dsfield(inner, INET_ECN_MASK, dscp);
108}
109
110struct ipv6hdr;
111
112static inline int IP6_ECN_set_ce(struct ipv6hdr *iph)
113{
114 if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
115 return 0;
116 *(__be32*)iph |= htonl(INET_ECN_CE << 20);
117 return 1;
118}
119
120static inline void IP6_ECN_clear(struct ipv6hdr *iph)
121{
122 *(__be32*)iph &= ~htonl(INET_ECN_MASK << 20);
123}
124
125static inline void ipv6_copy_dscp(unsigned int dscp, struct ipv6hdr *inner)
126{
127 dscp &= ~INET_ECN_MASK;
128 ipv6_change_dsfield(inner, INET_ECN_MASK, dscp);
129}
130
131static inline int INET_ECN_set_ce(struct sk_buff *skb)
132{
133 switch (skb->protocol) {
134 case cpu_to_be16(ETH_P_IP):
135 if (skb->network_header + sizeof(struct iphdr) <= skb->tail)
136 return IP_ECN_set_ce(ip_hdr(skb));
137 break;
138
139 case cpu_to_be16(ETH_P_IPV6):
140 if (skb->network_header + sizeof(struct ipv6hdr) <= skb->tail)
141 return IP6_ECN_set_ce(ipv6_hdr(skb));
142 break;
143 }
144
145 return 0;
146}
147
148#endif