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 25 struct 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
