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l2_packet.h
(5.8 KB)
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l2_packet_freebsd.c
(7.75 KB)
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l2_packet_ndis.c
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l2_packet_none.c
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l2_packet_privsep.c
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Editing: l2_packet.h
/* * WPA Supplicant - Layer2 packet interface definition * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi> * * This software may be distributed under the terms of the BSD license. * See README for more details. * * This file defines an interface for layer 2 (link layer) packet sending and * receiving. l2_packet_linux.c is one implementation for such a layer 2 * implementation using Linux packet sockets and l2_packet_pcap.c another one * using libpcap and libdnet. When porting %wpa_supplicant to other operating * systems, a new l2_packet implementation may need to be added. */ #ifndef L2_PACKET_H #define L2_PACKET_H /** * struct l2_packet_data - Internal l2_packet data structure * * This structure is used by the l2_packet implementation to store its private * data. Other files use a pointer to this data when calling the l2_packet * functions, but the contents of this structure should not be used directly * outside l2_packet implementation. */ struct l2_packet_data; #ifdef _MSC_VER #pragma pack(push, 1) #endif /* _MSC_VER */ struct l2_ethhdr { u8 h_dest[ETH_ALEN]; u8 h_source[ETH_ALEN]; be16 h_proto; } STRUCT_PACKED; #ifdef _MSC_VER #pragma pack(pop) #endif /* _MSC_VER */ enum l2_packet_filter_type { L2_PACKET_FILTER_DHCP, L2_PACKET_FILTER_NDISC, L2_PACKET_FILTER_PKTTYPE, }; /** * l2_packet_init - Initialize l2_packet interface * @ifname: Interface name * @own_addr: Optional own MAC address if available from driver interface or * %NULL if not available * @protocol: Ethernet protocol number in host byte order * @rx_callback: Callback function that will be called for each received packet * @rx_callback_ctx: Callback data (ctx) for calls to rx_callback() * @l2_hdr: 1 = include layer 2 header, 0 = do not include header * Returns: Pointer to internal data or %NULL on failure * * rx_callback function will be called with src_addr pointing to the source * address (MAC address) of the the packet. If l2_hdr is set to 0, buf * points to len bytes of the payload after the layer 2 header and similarly, * TX buffers start with payload. This behavior can be changed by setting * l2_hdr=1 to include the layer 2 header in the data buffer. */ struct l2_packet_data * l2_packet_init( const char *ifname, const u8 *own_addr, unsigned short protocol, void (*rx_callback)(void *ctx, const u8 *src_addr, const u8 *buf, size_t len), void *rx_callback_ctx, int l2_hdr); /** * l2_packet_init_bridge - Like l2_packet_init() but with bridge workaround * * This version of l2_packet_init() can be used to enable a workaround for Linux * packet socket in case of a station interface in a bridge. */ struct l2_packet_data * l2_packet_init_bridge( const char *br_ifname, const char *ifname, const u8 *own_addr, unsigned short protocol, void (*rx_callback)(void *ctx, const u8 *src_addr, const u8 *buf, size_t len), void *rx_callback_ctx, int l2_hdr); /** * l2_packet_deinit - Deinitialize l2_packet interface * @l2: Pointer to internal l2_packet data from l2_packet_init() */ void l2_packet_deinit(struct l2_packet_data *l2); /** * l2_packet_get_own_addr - Get own layer 2 address * @l2: Pointer to internal l2_packet data from l2_packet_init() * @addr: Buffer for the own address (6 bytes) * Returns: 0 on success, -1 on failure */ int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr); /** * l2_packet_send - Send a packet * @l2: Pointer to internal l2_packet data from l2_packet_init() * @dst_addr: Destination address for the packet (only used if l2_hdr == 0) * @proto: Protocol/ethertype for the packet in host byte order (only used if * l2_hdr == 0) * @buf: Packet contents to be sent; including layer 2 header if l2_hdr was * set to 1 in l2_packet_init() call. Otherwise, only the payload of the packet * is included. * @len: Length of the buffer (including l2 header only if l2_hdr == 1) * Returns: >=0 on success, <0 on failure */ int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto, const u8 *buf, size_t len); /** * l2_packet_get_ip_addr - Get the current IP address from the interface * @l2: Pointer to internal l2_packet data from l2_packet_init() * @buf: Buffer for the IP address in text format * @len: Maximum buffer length * Returns: 0 on success, -1 on failure * * This function can be used to get the current IP address from the interface * bound to the l2_packet. This is mainly for status information and the IP * address will be stored as an ASCII string. This function is not essential * for %wpa_supplicant operation, so full implementation is not required. * l2_packet implementation will need to define the function, but it can return * -1 if the IP address information is not available. */ int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len); /** * l2_packet_notify_auth_start - Notify l2_packet about start of authentication * @l2: Pointer to internal l2_packet data from l2_packet_init() * * This function is called when authentication is expected to start, e.g., when * association has been completed, in order to prepare l2_packet implementation * for EAPOL frames. This function is used mainly if the l2_packet code needs * to do polling in which case it can increasing polling frequency. This can * also be an empty function if the l2_packet implementation does not benefit * from knowing about the starting authentication. */ void l2_packet_notify_auth_start(struct l2_packet_data *l2); /** * l2_packet_set_packet_filter - Set socket filter for l2_packet * @l2: Pointer to internal l2_packet data from l2_packet_init() * @type: enum l2_packet_filter_type, type of filter * Returns: 0 on success, -1 on failure * * This function is used to set the socket filter for l2_packet socket. * */ int l2_packet_set_packet_filter(struct l2_packet_data *l2, enum l2_packet_filter_type type); #endif /* L2_PACKET_H */
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