include/net/netfilter/nf_tables_ipv6.h

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