github.com/datadog/cilium@v1.6.12/bpf/lib/xdp.h (about)

     1  /*
     2   *  Copyright (C) 2017 Authors of Cilium
     3   *
     4   *  This program is free software; you can redistribute it and/or modify
     5   *  it under the terms of the GNU General Public License as published by
     6   *  the Free Software Foundation; either version 2 of the License, or
     7   *  (at your option) any later version.
     8   *
     9   *  This program is distributed in the hope that it will be useful,
    10   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    11   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12   *  GNU General Public License for more details.
    13   *
    14   *  You should have received a copy of the GNU General Public License
    15   *  along with this program; if not, write to the Free Software
    16   *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    17   */
    18  #ifndef __LIB_XDP_H_
    19  #define __LIB_XDP_H_
    20  
    21  #include <stdbool.h>
    22  
    23  struct lpm_v4_key {
    24  	struct bpf_lpm_trie_key lpm;
    25  	__u8 addr[4];
    26  };
    27  
    28  struct lpm_v6_key {
    29  	struct bpf_lpm_trie_key lpm;
    30  	__u8 addr[16];
    31  };
    32  
    33  struct lpm_val {
    34  	/* Just dummy for now. */
    35  	__u8 flags;
    36  };
    37  
    38  static __always_inline void *xdp_data(const struct xdp_md *xdp)
    39  {
    40  	return (void *)(unsigned long)xdp->data;
    41  }
    42  
    43  static __always_inline void *xdp_data_end(const struct xdp_md *xdp)
    44  {
    45  	return (void *)(unsigned long)xdp->data_end;
    46  }
    47  
    48  static __always_inline bool xdp_no_room(const void *needed, const void *limit)
    49  {
    50  	return unlikely(needed > limit);
    51  }
    52  
    53  #endif /* __LIB_XDP_H_ */