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1 #ifndef __LINUX_NETLINK_H |
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2 #define __LINUX_NETLINK_H |
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3 |
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4 #include <linux/socket.h> /* for sa_family_t */ |
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5 #include <linux/types.h> |
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6 |
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7 #define NETLINK_ROUTE 0 /* Routing/device hook */ |
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8 #define NETLINK_UNUSED 1 /* Unused number */ |
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9 #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ |
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10 #define NETLINK_FIREWALL 3 /* Firewalling hook */ |
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11 #define NETLINK_INET_DIAG 4 /* INET socket monitoring */ |
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12 #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ |
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13 #define NETLINK_XFRM 6 /* ipsec */ |
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14 #define NETLINK_SELINUX 7 /* SELinux event notifications */ |
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15 #define NETLINK_ISCSI 8 /* Open-iSCSI */ |
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16 #define NETLINK_AUDIT 9 /* auditing */ |
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17 #define NETLINK_FIB_LOOKUP 10 |
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18 #define NETLINK_CONNECTOR 11 |
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19 #define NETLINK_NETFILTER 12 /* netfilter subsystem */ |
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20 #define NETLINK_IP6_FW 13 |
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21 #define NETLINK_DNRTMSG 14 /* DECnet routing messages */ |
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22 #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ |
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23 #define NETLINK_GENERIC 16 |
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24 /* leave room for NETLINK_DM (DM Events) */ |
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25 #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ |
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26 #define NETLINK_ECRYPTFS 19 |
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27 |
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28 #define MAX_LINKS 32 |
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29 |
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30 struct net; |
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31 |
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32 struct sockaddr_nl |
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33 { |
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34 sa_family_t nl_family; /* AF_NETLINK */ |
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35 unsigned short nl_pad; /* zero */ |
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36 __u32 nl_pid; /* port ID */ |
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37 __u32 nl_groups; /* multicast groups mask */ |
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38 }; |
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39 |
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40 struct nlmsghdr |
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41 { |
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42 __u32 nlmsg_len; /* Length of message including header */ |
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43 __u16 nlmsg_type; /* Message content */ |
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44 __u16 nlmsg_flags; /* Additional flags */ |
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45 __u32 nlmsg_seq; /* Sequence number */ |
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46 __u32 nlmsg_pid; /* Sending process port ID */ |
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47 }; |
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48 |
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49 /* Flags values */ |
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50 |
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51 #define NLM_F_REQUEST 1 /* It is request message. */ |
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52 #define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ |
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53 #define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ |
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54 #define NLM_F_ECHO 8 /* Echo this request */ |
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55 |
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56 /* Modifiers to GET request */ |
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57 #define NLM_F_ROOT 0x100 /* specify tree root */ |
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58 #define NLM_F_MATCH 0x200 /* return all matching */ |
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59 #define NLM_F_ATOMIC 0x400 /* atomic GET */ |
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60 #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) |
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61 |
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62 /* Modifiers to NEW request */ |
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63 #define NLM_F_REPLACE 0x100 /* Override existing */ |
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64 #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ |
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65 #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ |
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66 #define NLM_F_APPEND 0x800 /* Add to end of list */ |
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67 |
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68 /* |
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69 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL |
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70 4.4BSD CHANGE NLM_F_REPLACE |
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71 |
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72 True CHANGE NLM_F_CREATE|NLM_F_REPLACE |
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73 Append NLM_F_CREATE |
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74 Check NLM_F_EXCL |
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75 */ |
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76 |
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77 #define NLMSG_ALIGNTO 4 |
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78 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) |
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79 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) |
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80 #define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) |
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81 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) |
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82 #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) |
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83 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ |
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84 (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) |
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85 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ |
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86 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ |
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87 (nlh)->nlmsg_len <= (len)) |
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88 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) |
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89 |
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90 #define NLMSG_NOOP 0x1 /* Nothing. */ |
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91 #define NLMSG_ERROR 0x2 /* Error */ |
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92 #define NLMSG_DONE 0x3 /* End of a dump */ |
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93 #define NLMSG_OVERRUN 0x4 /* Data lost */ |
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94 |
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95 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ |
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96 |
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97 struct nlmsgerr |
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98 { |
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99 int error; |
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100 struct nlmsghdr msg; |
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101 }; |
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102 |
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103 #define NETLINK_ADD_MEMBERSHIP 1 |
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104 #define NETLINK_DROP_MEMBERSHIP 2 |
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105 #define NETLINK_PKTINFO 3 |
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106 |
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107 struct nl_pktinfo |
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108 { |
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109 __u32 group; |
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110 }; |
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111 |
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112 #define NET_MAJOR 36 /* Major 36 is reserved for networking */ |
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113 |
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114 enum { |
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115 NETLINK_UNCONNECTED = 0, |
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116 NETLINK_CONNECTED, |
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117 }; |
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118 |
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119 /* |
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120 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> |
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121 * +---------------------+- - -+- - - - - - - - - -+- - -+ |
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122 * | Header | Pad | Payload | Pad | |
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123 * | (struct nlattr) | ing | | ing | |
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124 * +---------------------+- - -+- - - - - - - - - -+- - -+ |
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125 * <-------------- nlattr->nla_len --------------> |
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126 */ |
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127 |
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128 struct nlattr |
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129 { |
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130 __u16 nla_len; |
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131 __u16 nla_type; |
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132 }; |
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133 |
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134 /* |
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135 * nla_type (16 bits) |
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136 * +---+---+-------------------------------+ |
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137 * | N | O | Attribute Type | |
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138 * +---+---+-------------------------------+ |
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139 * N := Carries nested attributes |
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140 * O := Payload stored in network byte order |
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141 * |
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142 * Note: The N and O flag are mutually exclusive. |
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143 */ |
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144 #define NLA_F_NESTED (1 << 15) |
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145 #define NLA_F_NET_BYTEORDER (1 << 14) |
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146 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) |
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147 |
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148 #define NLA_ALIGNTO 4 |
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149 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) |
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150 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) |
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151 |
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152 #ifdef __KERNEL__ |
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153 |
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154 #include <linux/capability.h> |
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155 #include <linux/skbuff.h> |
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156 |
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157 static inline struct nlmsghdr *nlmsg_hdr(const struct sk_buff *skb) |
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158 { |
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159 return (struct nlmsghdr *)skb->data; |
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160 } |
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161 |
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162 struct netlink_skb_parms |
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163 { |
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164 struct ucred creds; /* Skb credentials */ |
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165 __u32 pid; |
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166 __u32 dst_group; |
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167 kernel_cap_t eff_cap; |
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168 __u32 loginuid; /* Login (audit) uid */ |
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169 __u32 sessionid; /* Session id (audit) */ |
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170 __u32 sid; /* SELinux security id */ |
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171 }; |
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172 |
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173 #define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb)) |
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174 #define NETLINK_CREDS(skb) (&NETLINK_CB((skb)).creds) |
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175 |
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176 |
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177 extern struct sock *netlink_kernel_create(struct net *net, |
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178 int unit,unsigned int groups, |
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179 void (*input)(struct sk_buff *skb), |
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180 struct mutex *cb_mutex, |
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181 struct module *module); |
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182 extern void netlink_kernel_release(struct sock *sk); |
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183 extern int netlink_change_ngroups(struct sock *sk, unsigned int groups); |
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184 extern void netlink_clear_multicast_users(struct sock *sk, unsigned int group); |
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185 extern void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err); |
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186 extern int netlink_has_listeners(struct sock *sk, unsigned int group); |
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187 extern int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 pid, int nonblock); |
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188 extern int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 pid, |
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189 __u32 group, gfp_t allocation); |
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190 extern void netlink_set_err(struct sock *ssk, __u32 pid, __u32 group, int code); |
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191 extern int netlink_register_notifier(struct notifier_block *nb); |
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192 extern int netlink_unregister_notifier(struct notifier_block *nb); |
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193 |
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194 /* finegrained unicast helpers: */ |
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195 struct sock *netlink_getsockbyfilp(struct file *filp); |
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196 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
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197 long *timeo, struct sock *ssk); |
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198 void netlink_detachskb(struct sock *sk, struct sk_buff *skb); |
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199 int netlink_sendskb(struct sock *sk, struct sk_buff *skb); |
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200 |
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201 /* |
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202 * skb should fit one page. This choice is good for headerless malloc. |
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203 * But we should limit to 8K so that userspace does not have to |
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204 * use enormous buffer sizes on recvmsg() calls just to avoid |
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205 * MSG_TRUNC when PAGE_SIZE is very large. |
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206 */ |
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207 #if PAGE_SIZE < 8192UL |
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208 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE) |
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209 #else |
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210 #define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL) |
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211 #endif |
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212 |
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213 #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN) |
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214 |
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215 |
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216 struct netlink_callback |
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217 { |
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218 struct sk_buff *skb; |
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219 struct nlmsghdr *nlh; |
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220 int (*dump)(struct sk_buff * skb, struct netlink_callback *cb); |
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221 int (*done)(struct netlink_callback *cb); |
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222 int family; |
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223 long args[6]; |
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224 }; |
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225 |
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226 struct netlink_notify |
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227 { |
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228 struct net *net; |
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229 int pid; |
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230 int protocol; |
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231 }; |
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232 |
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233 static __inline__ struct nlmsghdr * |
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234 __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) |
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235 { |
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236 struct nlmsghdr *nlh; |
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237 int size = NLMSG_LENGTH(len); |
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238 |
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239 nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); |
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240 nlh->nlmsg_type = type; |
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241 nlh->nlmsg_len = size; |
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242 nlh->nlmsg_flags = flags; |
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243 nlh->nlmsg_pid = pid; |
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244 nlh->nlmsg_seq = seq; |
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245 memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); |
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246 return nlh; |
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247 } |
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248 |
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249 #define NLMSG_NEW(skb, pid, seq, type, len, flags) \ |
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250 ({ if (unlikely(skb_tailroom(skb) < (int)NLMSG_SPACE(len))) \ |
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251 goto nlmsg_failure; \ |
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252 __nlmsg_put(skb, pid, seq, type, len, flags); }) |
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253 |
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254 #define NLMSG_PUT(skb, pid, seq, type, len) \ |
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255 NLMSG_NEW(skb, pid, seq, type, len, 0) |
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256 |
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257 extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
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258 struct nlmsghdr *nlh, |
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259 int (*dump)(struct sk_buff *skb, struct netlink_callback*), |
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260 int (*done)(struct netlink_callback*)); |
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261 |
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262 |
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263 #define NL_NONROOT_RECV 0x1 |
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264 #define NL_NONROOT_SEND 0x2 |
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265 extern void netlink_set_nonroot(int protocol, unsigned flag); |
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266 |
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267 #endif /* __KERNEL__ */ |
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268 |
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269 #endif /* __LINUX_NETLINK_H */ |