linux/include/net/netfilter/nf_tables_ipv6.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _NF_TABLES_IPV6_H_
   3#define _NF_TABLES_IPV6_H_
   4
   5#include <linux/netfilter_ipv6/ip6_tables.h>
   6#include <net/ipv6.h>
   7
   8static inline void nft_set_pktinfo_ipv6(struct nft_pktinfo *pkt,
   9                                        struct sk_buff *skb)
  10{
  11        unsigned int flags = IP6_FH_F_AUTH;
  12        int protohdr, thoff = 0;
  13        unsigned short frag_off;
  14
  15        protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags);
  16        if (protohdr < 0) {
  17                nft_set_pktinfo_unspec(pkt, skb);
  18                return;
  19        }
  20
  21        pkt->tprot_set = true;
  22        pkt->tprot = protohdr;
  23        pkt->xt.thoff = thoff;
  24        pkt->xt.fragoff = frag_off;
  25}
  26
  27static inline int __nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt,
  28                                                  struct sk_buff *skb)
  29{
  30#if IS_ENABLED(CONFIG_IPV6)
  31        unsigned int flags = IP6_FH_F_AUTH;
  32        struct ipv6hdr *ip6h, _ip6h;
  33        unsigned int thoff = 0;
  34        unsigned short frag_off;
  35        int protohdr;
  36        u32 pkt_len;
  37
  38        ip6h = skb_header_pointer(skb, skb_network_offset(skb), sizeof(*ip6h),
  39                                  &_ip6h);
  40        if (!ip6h)
  41                return -1;
  42
  43        if (ip6h->version != 6)
  44                return -1;
  45
  46        pkt_len = ntohs(ip6h->payload_len);
  47        if (pkt_len + sizeof(*ip6h) > skb->len)
  48                return -1;
  49
  50        protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags);
  51        if (protohdr < 0)
  52                return -1;
  53
  54        pkt->tprot_set = true;
  55        pkt->tprot = protohdr;
  56        pkt->xt.thoff = thoff;
  57        pkt->xt.fragoff = frag_off;
  58
  59        return 0;
  60#else
  61        return -1;
  62#endif
  63}
  64
  65static inline void nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt,
  66                                                 struct sk_buff *skb)
  67{
  68        if (__nft_set_pktinfo_ipv6_validate(pkt, skb) < 0)
  69                nft_set_pktinfo_unspec(pkt, skb);
  70}
  71
  72#endif
  73