LXR linux/include/uapi/linux/netfilter/nfnetlink

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2#ifndef _NFNETLINK_COMPAT_H
   3#define _NFNETLINK_COMPAT_H
   4
   5#include <linux/types.h>
   6
   7#ifndef __KERNEL__
   8/* Old nfnetlink macros for userspace */
   9
  10/* nfnetlink groups: Up to 32 maximum */
  11#define NF_NETLINK_CONNTRACK_NEW                0x00000001
  12#define NF_NETLINK_CONNTRACK_UPDATE             0x00000002
  13#define NF_NETLINK_CONNTRACK_DESTROY            0x00000004
  14#define NF_NETLINK_CONNTRACK_EXP_NEW            0x00000008
  15#define NF_NETLINK_CONNTRACK_EXP_UPDATE         0x00000010
  16#define NF_NETLINK_CONNTRACK_EXP_DESTROY        0x00000020
  17
  18/* Generic structure for encapsulation optional netfilter information.
  19 * It is reminiscent of sockaddr, but with sa_family replaced
  20 * with attribute type.
  21 * ! This should someday be put somewhere generic as now rtnetlink and
  22 * ! nfnetlink use the same attributes methods. - J. Schulist.
  23 */
  24
  25struct nfattr {
  26        __u16 nfa_len;
  27        __u16 nfa_type; /* we use 15 bits for the type, and the highest
  28                                 * bit to indicate whether the payload is nested */
  29};
  30
  31/* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from
  32 * rtnetlink.h, it's time to put this in a generic file */
  33
  34#define NFNL_NFA_NEST   0x8000
  35#define NFA_TYPE(attr)  ((attr)->nfa_type & 0x7fff)
  36
  37#define NFA_ALIGNTO     4
  38#define NFA_ALIGN(len)  (((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1))
  39#define NFA_OK(nfa,len) ((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \
  40        && (nfa)->nfa_len <= (len))
  41#define NFA_NEXT(nfa,attrlen)   ((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \
  42        (struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len)))
  43#define NFA_LENGTH(len) (NFA_ALIGN(sizeof(struct nfattr)) + (len))
  44#define NFA_SPACE(len)  NFA_ALIGN(NFA_LENGTH(len))
  45#define NFA_DATA(nfa)   ((void *)(((char *)(nfa)) + NFA_LENGTH(0)))
  46#define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0))
  47#define NFA_NEST(skb, type) \
  48({      struct nfattr *__start = (struct nfattr *)skb_tail_pointer(skb); \
  49        NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \
  50        __start;  })
  51#define NFA_NEST_END(skb, start) \
  52({      (start)->nfa_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
  53        (skb)->len; })
  54#define NFA_NEST_CANCEL(skb, start) \
  55({      if (start) \
  56                skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
  57        -1; })
  58
  59#define NFM_NFA(n)      ((struct nfattr *)(((char *)(n)) \
  60        + NLMSG_ALIGN(sizeof(struct nfgenmsg))))
  61#define NFM_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))
  62
  63#endif /* ! __KERNEL__ */
  64#endif /* _NFNETLINK_COMPAT_H */
  65