1*6f52b16cSGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 294d0ec58SDavid Howells #ifndef _NFNETLINK_COMPAT_H 394d0ec58SDavid Howells #define _NFNETLINK_COMPAT_H 494d0ec58SDavid Howells 594d0ec58SDavid Howells #include <linux/types.h> 694d0ec58SDavid Howells 794d0ec58SDavid Howells #ifndef __KERNEL__ 894d0ec58SDavid Howells /* Old nfnetlink macros for userspace */ 994d0ec58SDavid Howells 1094d0ec58SDavid Howells /* nfnetlink groups: Up to 32 maximum */ 1194d0ec58SDavid Howells #define NF_NETLINK_CONNTRACK_NEW 0x00000001 1294d0ec58SDavid Howells #define NF_NETLINK_CONNTRACK_UPDATE 0x00000002 1394d0ec58SDavid Howells #define NF_NETLINK_CONNTRACK_DESTROY 0x00000004 1494d0ec58SDavid Howells #define NF_NETLINK_CONNTRACK_EXP_NEW 0x00000008 1594d0ec58SDavid Howells #define NF_NETLINK_CONNTRACK_EXP_UPDATE 0x00000010 1694d0ec58SDavid Howells #define NF_NETLINK_CONNTRACK_EXP_DESTROY 0x00000020 1794d0ec58SDavid Howells 1894d0ec58SDavid Howells /* Generic structure for encapsulation optional netfilter information. 1994d0ec58SDavid Howells * It is reminiscent of sockaddr, but with sa_family replaced 2094d0ec58SDavid Howells * with attribute type. 2194d0ec58SDavid Howells * ! This should someday be put somewhere generic as now rtnetlink and 2294d0ec58SDavid Howells * ! nfnetlink use the same attributes methods. - J. Schulist. 2394d0ec58SDavid Howells */ 2494d0ec58SDavid Howells 2594d0ec58SDavid Howells struct nfattr { 2694d0ec58SDavid Howells __u16 nfa_len; 2794d0ec58SDavid Howells __u16 nfa_type; /* we use 15 bits for the type, and the highest 2894d0ec58SDavid Howells * bit to indicate whether the payload is nested */ 2994d0ec58SDavid Howells }; 3094d0ec58SDavid Howells 3194d0ec58SDavid Howells /* FIXME: Apart from NFNL_NFA_NESTED shamelessly copy and pasted from 3294d0ec58SDavid Howells * rtnetlink.h, it's time to put this in a generic file */ 3394d0ec58SDavid Howells 3494d0ec58SDavid Howells #define NFNL_NFA_NEST 0x8000 3594d0ec58SDavid Howells #define NFA_TYPE(attr) ((attr)->nfa_type & 0x7fff) 3694d0ec58SDavid Howells 3794d0ec58SDavid Howells #define NFA_ALIGNTO 4 3894d0ec58SDavid Howells #define NFA_ALIGN(len) (((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1)) 3994d0ec58SDavid Howells #define NFA_OK(nfa,len) ((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \ 4094d0ec58SDavid Howells && (nfa)->nfa_len <= (len)) 4194d0ec58SDavid Howells #define NFA_NEXT(nfa,attrlen) ((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \ 4294d0ec58SDavid Howells (struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len))) 4394d0ec58SDavid Howells #define NFA_LENGTH(len) (NFA_ALIGN(sizeof(struct nfattr)) + (len)) 4494d0ec58SDavid Howells #define NFA_SPACE(len) NFA_ALIGN(NFA_LENGTH(len)) 4594d0ec58SDavid Howells #define NFA_DATA(nfa) ((void *)(((char *)(nfa)) + NFA_LENGTH(0))) 4694d0ec58SDavid Howells #define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0)) 4794d0ec58SDavid Howells #define NFA_NEST(skb, type) \ 4894d0ec58SDavid Howells ({ struct nfattr *__start = (struct nfattr *)skb_tail_pointer(skb); \ 4994d0ec58SDavid Howells NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \ 5094d0ec58SDavid Howells __start; }) 5194d0ec58SDavid Howells #define NFA_NEST_END(skb, start) \ 5294d0ec58SDavid Howells ({ (start)->nfa_len = skb_tail_pointer(skb) - (unsigned char *)(start); \ 5394d0ec58SDavid Howells (skb)->len; }) 5494d0ec58SDavid Howells #define NFA_NEST_CANCEL(skb, start) \ 5594d0ec58SDavid Howells ({ if (start) \ 5694d0ec58SDavid Howells skb_trim(skb, (unsigned char *) (start) - (skb)->data); \ 5794d0ec58SDavid Howells -1; }) 5894d0ec58SDavid Howells 5994d0ec58SDavid Howells #define NFM_NFA(n) ((struct nfattr *)(((char *)(n)) \ 6094d0ec58SDavid Howells + NLMSG_ALIGN(sizeof(struct nfgenmsg)))) 6194d0ec58SDavid Howells #define NFM_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg)) 6294d0ec58SDavid Howells 6394d0ec58SDavid Howells #endif /* ! __KERNEL__ */ 6494d0ec58SDavid Howells #endif /* _NFNETLINK_COMPAT_H */ 65