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linux
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netfilter
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nfnetlink_compat.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _NFNETLINK_COMPAT_H #define _NFNETLINK_COMPAT_H #include <linux/types.h> /* Old nfnetlink macros for userspace */ /* nfnetlink groups: Up to 32 maximum */ #define NF_NETLINK_CONNTRACK_NEW 0x00000001 #define NF_NETLINK_CONNTRACK_UPDATE 0x00000002 #define NF_NETLINK_CONNTRACK_DESTROY 0x00000004 #define NF_NETLINK_CONNTRACK_EXP_NEW 0x00000008 #define NF_NETLINK_CONNTRACK_EXP_UPDATE 0x00000010 #define NF_NETLINK_CONNTRACK_EXP_DESTROY 0x00000020 /* Generic structure for encapsulation optional netfilter information. * It is reminiscent of sockaddr, but with sa_family replaced * with attribute type. * ! This should someday be put somewhere generic as now rtnetlink and * ! nfnetlink use the same attributes methods. - J. Schulist. */ struct nfattr { __u16 nfa_len; __u16 nfa_type; /* we use 15 bits for the type, and the highest * bit to indicate whether the payload is nested */ }; /* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from * rtnetlink.h, it's time to put this in a generic file */ #define NFNL_NFA_NEST 0x8000 #define NFA_TYPE(attr) ((attr)->nfa_type & 0x7fff) #define NFA_ALIGNTO 4 #define NFA_ALIGN(len) (((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1)) #define NFA_OK(nfa,len) ((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \ && (nfa)->nfa_len <= (len)) #define NFA_NEXT(nfa,attrlen) ((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \ (struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len))) #define NFA_LENGTH(len) (NFA_ALIGN(sizeof(struct nfattr)) + (len)) #define NFA_SPACE(len) NFA_ALIGN(NFA_LENGTH(len)) #define NFA_DATA(nfa) ((void *)(((char *)(nfa)) + NFA_LENGTH(0))) #define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0)) #define NFA_NEST(skb, type) \ ({ struct nfattr *__start = (struct nfattr *)skb_tail_pointer(skb); \ NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \ __start; }) #define NFA_NEST_END(skb, start) \ ({ (start)->nfa_len = skb_tail_pointer(skb) - (unsigned char *)(start); \ (skb)->len; }) #define NFA_NEST_CANCEL(skb, start) \ ({ if (start) \ skb_trim(skb, (unsigned char *) (start) - (skb)->data); \ -1; }) #define NFM_NFA(n) ((struct nfattr *)(((char *)(n)) \ + NLMSG_ALIGN(sizeof(struct nfgenmsg)))) #define NFM_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg)) #endif /* _NFNETLINK_COMPAT_H */