1 /* 2 * netlink/handlers.c default netlink message handlers 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation version 2.1 7 * of the License. 8 * 9 * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> 10 */ 11 12 #ifndef NETLINK_HANDLERS_H_ 13 #define NETLINK_HANDLERS_H_ 14 15 #include <stdio.h> 16 #include <stdint.h> 17 #include <sys/types.h> 18 #include <netlink/netlink-compat.h> 19 #include <netlink/netlink-kernel.h> 20 21 #ifdef __cplusplus 22 extern "C" { 23 #endif 24 25 struct nl_cb; 26 struct nl_sock; 27 struct nl_msg; 28 struct ucred; 29 30 /** 31 * @name Callback Typedefs 32 * @{ 33 */ 34 35 /** 36 * nl_recvmsgs() callback for message processing customization 37 * @ingroup cb 38 * @arg msg netlink message being processed 39 * @arg arg argument passwd on through caller 40 */ 41 typedef int (*nl_recvmsg_msg_cb_t)(struct nl_msg *msg, void *arg); 42 43 /** 44 * nl_recvmsgs() callback for error message processing customization 45 * @ingroup cb 46 * @arg nla netlink address of the peer 47 * @arg nlerr netlink error message being processed 48 * @arg arg argument passed on through caller 49 */ 50 typedef int (*nl_recvmsg_err_cb_t)(struct sockaddr_nl *nla, 51 struct nlmsgerr *nlerr, void *arg); 52 53 /** @} */ 54 55 /** 56 * Callback actions 57 * @ingroup cb 58 */ 59 enum nl_cb_action { 60 /** Proceed with wathever would come next */ 61 NL_OK, 62 /** Skip this message */ 63 NL_SKIP, 64 /** Stop parsing altogether and discard remaining messages */ 65 NL_STOP, 66 }; 67 68 /** 69 * Callback kinds 70 * @ingroup cb 71 */ 72 enum nl_cb_kind { 73 /** Default handlers (quiet) */ 74 NL_CB_DEFAULT, 75 /** Verbose default handlers (error messages printed) */ 76 NL_CB_VERBOSE, 77 /** Debug handlers for debugging */ 78 NL_CB_DEBUG, 79 /** Customized handler specified by the user */ 80 NL_CB_CUSTOM, 81 __NL_CB_KIND_MAX, 82 }; 83 84 #define NL_CB_KIND_MAX (__NL_CB_KIND_MAX - 1) 85 86 /** 87 * Callback types 88 * @ingroup cb 89 */ 90 enum nl_cb_type { 91 /** Message is valid */ 92 NL_CB_VALID, 93 /** Last message in a series of multi part messages received */ 94 NL_CB_FINISH, 95 /** Report received that data was lost */ 96 NL_CB_OVERRUN, 97 /** Message wants to be skipped */ 98 NL_CB_SKIPPED, 99 /** Message is an acknowledge */ 100 NL_CB_ACK, 101 /** Called for every message received */ 102 NL_CB_MSG_IN, 103 /** Called for every message sent out except for nl_sendto() */ 104 NL_CB_MSG_OUT, 105 /** Message is malformed and invalid */ 106 NL_CB_INVALID, 107 /** Called instead of internal sequence number checking */ 108 NL_CB_SEQ_CHECK, 109 /** Sending of an acknowledge message has been requested */ 110 NL_CB_SEND_ACK, 111 __NL_CB_TYPE_MAX, 112 }; 113 114 #define NL_CB_TYPE_MAX (__NL_CB_TYPE_MAX - 1) 115 116 extern struct nl_cb * nl_cb_alloc(enum nl_cb_kind); 117 extern struct nl_cb * nl_cb_clone(struct nl_cb *); 118 extern struct nl_cb * nl_cb_get(struct nl_cb *); 119 extern void nl_cb_put(struct nl_cb *); 120 121 extern int nl_cb_set(struct nl_cb *, enum nl_cb_type, enum nl_cb_kind, 122 nl_recvmsg_msg_cb_t, void *); 123 extern int nl_cb_set_all(struct nl_cb *, enum nl_cb_kind, 124 nl_recvmsg_msg_cb_t, void *); 125 extern int nl_cb_err(struct nl_cb *, enum nl_cb_kind, nl_recvmsg_err_cb_t, 126 void *); 127 128 extern void nl_cb_overwrite_recvmsgs(struct nl_cb *, 129 int (*func)(struct nl_sock *, 130 struct nl_cb *)); 131 extern void nl_cb_overwrite_recv(struct nl_cb *, 132 int (*func)(struct nl_sock *, 133 struct sockaddr_nl *, 134 unsigned char **, 135 struct ucred **)); 136 extern void nl_cb_overwrite_send(struct nl_cb *, 137 int (*func)(struct nl_sock *, 138 struct nl_msg *)); 139 140 #ifdef __cplusplus 141 } 142 #endif 143 144 #endif 145