linux / linux / kernel / git / viro / vfs / e6d69a60b77a6ea8d5f9d41765c7571bb8d45531 / . / net / batman-adv / bitarray.h

/* Copyright (C) 2006-2013 B.A.T.M.A.N. contributors: | |

* | |

* Simon Wunderlich, Marek Lindner | |

* | |

* This program is free software; you can redistribute it and/or | |

* modify it under the terms of version 2 of the GNU General Public | |

* License as published by the Free Software Foundation. | |

* | |

* This program is distributed in the hope that it will be useful, but | |

* WITHOUT ANY WARRANTY; without even the implied warranty of | |

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |

* General Public License for more details. | |

* | |

* You should have received a copy of the GNU General Public License | |

* along with this program; if not, write to the Free Software | |

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |

* 02110-1301, USA | |

*/ | |

#ifndef _NET_BATMAN_ADV_BITARRAY_H_ | |

#define _NET_BATMAN_ADV_BITARRAY_H_ | |

/* Returns 1 if the corresponding bit in the given seq_bits indicates true | |

* and curr_seqno is within range of last_seqno. Otherwise returns 0. | |

*/ | |

static inline int batadv_test_bit(const unsigned long *seq_bits, | |

uint32_t last_seqno, uint32_t curr_seqno) | |

{ | |

int32_t diff; | |

diff = last_seqno - curr_seqno; | |

if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE) | |

return 0; | |

else | |

return test_bit(diff, seq_bits) != 0; | |

} | |

/* turn corresponding bit on, so we can remember that we got the packet */ | |

static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n) | |

{ | |

/* if too old, just drop it */ | |

if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE) | |

return; | |

set_bit(n, seq_bits); /* turn the position on */ | |

} | |

/* receive and process one packet, returns 1 if received seq_num is considered | |

* new, 0 if old | |

*/ | |

int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, | |

int32_t seq_num_diff, int set_mark); | |

#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */ |