x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / include / net / inet_ecn.h
blob9b5d08f4f6e8bb2459769463aceb19fbfd3da317
1 #ifndef _INET_ECN_H_
2 #define _INET_ECN_H_
4 #include <linux/ip.h>
5 #include <linux/skbuff.h>
7 #include <net/inet_sock.h>
8 #include <net/dsfield.h>
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,
18 static inline int INET_ECN_is_ce(__u8 dsfield)
20 return (dsfield & INET_ECN_MASK) == INET_ECN_CE;
23 static inline int INET_ECN_is_not_ect(__u8 dsfield)
25 return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT;
28 static inline int INET_ECN_is_capable(__u8 dsfield)
30 return (dsfield & INET_ECN_ECT_0);
33 static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
35 outer &= ~INET_ECN_MASK;
36 outer |= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) :
37 INET_ECN_ECT_0;
38 return outer;
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)
45 #define IP6_ECN_flow_init(label) do { \
46 (label) &= ~htonl(INET_ECN_MASK << 20); \
47 } while (0)
49 #define IP6_ECN_flow_xmit(sk, label) do { \
50 if (INET_ECN_is_capable(inet6_sk(sk)->tclass)) \
51 (label) |= htonl(INET_ECN_ECT_0 << 20); \
52 } while (0)
54 static inline int IP_ECN_set_ce(struct iphdr *iph)
56 u32 check = (__force u32)iph->check;
57 u32 ecn = (iph->tos + 1) & INET_ECN_MASK;
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
66 if (!(ecn & 2))
67 return !ecn;
70 * The following gives us:
71 * INET_ECN_ECT_1 => check += htons(0xFFFD)
72 * INET_ECN_ECT_0 => check += htons(0xFFFE)
74 check += (__force u16)htons(0xFFFB) + (__force u16)htons(ecn);
76 iph->check = (__force __sum16)(check + (check>=0xFFFF));
77 iph->tos |= INET_ECN_CE;
78 return 1;
81 static inline void IP_ECN_clear(struct iphdr *iph)
83 iph->tos &= ~INET_ECN_MASK;
86 static inline void ipv4_copy_dscp(unsigned int dscp, struct iphdr *inner)
88 dscp &= ~INET_ECN_MASK;
89 ipv4_change_dsfield(inner, INET_ECN_MASK, dscp);
92 struct ipv6hdr;
94 static inline int IP6_ECN_set_ce(struct ipv6hdr *iph)
96 if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
97 return 0;
98 *(__be32*)iph |= htonl(INET_ECN_CE << 20);
99 return 1;
102 static inline void IP6_ECN_clear(struct ipv6hdr *iph)
104 *(__be32*)iph &= ~htonl(INET_ECN_MASK << 20);
107 static inline void ipv6_copy_dscp(unsigned int dscp, struct ipv6hdr *inner)
109 dscp &= ~INET_ECN_MASK;
110 ipv6_change_dsfield(inner, INET_ECN_MASK, dscp);
113 static inline int INET_ECN_set_ce(struct sk_buff *skb)
115 switch (skb->protocol) {
116 case cpu_to_be16(ETH_P_IP):
117 if (skb->network_header + sizeof(struct iphdr) <= skb->tail)
118 return IP_ECN_set_ce(ip_hdr(skb));
119 break;
121 case cpu_to_be16(ETH_P_IPV6):
122 if (skb->network_header + sizeof(struct ipv6hdr) <= skb->tail)
123 return IP6_ECN_set_ce(ipv6_hdr(skb));
124 break;
127 return 0;
130 #endif