1 #ifndef _NFNETLINK_COMPAT_H 2 #define _NFNETLINK_COMPAT_H 3 /* Old nfnetlink macros for userspace */ 4 5 /* nfnetlink groups: Up to 32 maximum */ 6 #define NF_NETLINK_CONNTRACK_NEW 0x00000001 7 #define NF_NETLINK_CONNTRACK_UPDATE 0x00000002 8 #define NF_NETLINK_CONNTRACK_DESTROY 0x00000004 9 #define NF_NETLINK_CONNTRACK_EXP_NEW 0x00000008 10 #define NF_NETLINK_CONNTRACK_EXP_UPDATE 0x00000010 11 #define NF_NETLINK_CONNTRACK_EXP_DESTROY 0x00000020 12 13 /* Generic structure for encapsulation optional netfilter information. 14 * It is reminiscent of sockaddr, but with sa_family replaced 15 * with attribute type. 16 * ! This should someday be put somewhere generic as now rtnetlink and 17 * ! nfnetlink use the same attributes methods. - J. Schulist. 18 */ 19 20 struct nfattr 21 { 22 u_int16_t nfa_len; 23 u_int16_t nfa_type; /* we use 15 bits for the type, and the highest 24 * bit to indicate whether the payload is nested */ 25 }; 26 27 /* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from 28 * rtnetlink.h, it's time to put this in a generic file */ 29 30 #define NFNL_NFA_NEST 0x8000 31 #define NFA_TYPE(attr) ((attr)->nfa_type & 0x7fff) 32 33 #define NFA_ALIGNTO 4 34 #define NFA_ALIGN(len) (((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1)) 35 #define NFA_OK(nfa,len) ((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \ 36 && (nfa)->nfa_len <= (len)) 37 #define NFA_NEXT(nfa,attrlen) ((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \ 38 (struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len))) 39 #define NFA_LENGTH(len) (NFA_ALIGN(sizeof(struct nfattr)) + (len)) 40 #define NFA_SPACE(len) NFA_ALIGN(NFA_LENGTH(len)) 41 #define NFA_DATA(nfa) ((void *)(((char *)(nfa)) + NFA_LENGTH(0))) 42 #define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0)) 43 #define NFA_NEST(skb, type) \ 44 ({ struct nfattr *__start = (struct nfattr *)skb_tail_pointer(skb); \ 45 NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \ 46 __start; }) 47 #define NFA_NEST_END(skb, start) \ 48 ({ (start)->nfa_len = skb_tail_pointer(skb) - (unsigned char *)(start); \ 49 (skb)->len; }) 50 #define NFA_NEST_CANCEL(skb, start) \ 51 ({ if (start) \ 52 skb_trim(skb, (unsigned char *) (start) - (skb)->data); \ 53 -1; }) 54 55 #define NFM_NFA(n) ((struct nfattr *)(((char *)(n)) \ 56 + NLMSG_ALIGN(sizeof(struct nfgenmsg)))) 57 #define NFM_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg)) 58 59 #endif /* _NFNETLINK_COMPAT_H */ 60