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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NF_TABLES_IPV4_H_
#define _NF_TABLES_IPV4_H_
#include <net/netfilter/nf_tables.h>
#include <net/ip.h>
static inline void nft_set_pktinfo_ipv4(struct nft_pktinfo *pkt,
struct sk_buff *skb)
{
struct iphdr *ip;
ip = ip_hdr(pkt->skb);
pkt->tprot_set = true;
pkt->tprot = ip->protocol;
pkt->xt.thoff = ip_hdrlen(pkt->skb);
pkt->xt.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
}
static inline int __nft_set_pktinfo_ipv4_validate(struct nft_pktinfo *pkt,
struct sk_buff *skb)
{
struct iphdr *iph, _iph;
u32 len, thoff;
iph = skb_header_pointer(skb, skb_network_offset(skb), sizeof(*iph),
&_iph);
if (!iph)
return -1;
if (iph->ihl < 5 || iph->version != 4)
return -1;
len = ntohs(iph->tot_len);
thoff = iph->ihl * 4;
if (skb->len < len)
return -1;
else if (len < thoff)
return -1;
pkt->tprot_set = true;
pkt->tprot = iph->protocol;
pkt->xt.thoff = thoff;
pkt->xt.fragoff = ntohs(iph->frag_off) & IP_OFFSET;
return 0;
}
static inline void nft_set_pktinfo_ipv4_validate(struct nft_pktinfo *pkt,
struct sk_buff *skb)
{
if (__nft_set_pktinfo_ipv4_validate(pkt, skb) < 0)
nft_set_pktinfo_unspec(pkt, skb);
}
#endif
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