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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 | #include <net/netfilter/nf_tables.h> |
| 8 | |
| 9 | static inline void nft_set_pktinfo_ipv6(struct nft_pktinfo *pkt) |
| 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 || thoff > U16_MAX) { |
| 17 | nft_set_pktinfo_unspec(pkt); |
| 18 | return; |
| 19 | } |
| 20 | |
| 21 | pkt->flags = NFT_PKTINFO_L4PROTO; |
| 22 | pkt->tprot = protohdr; |
| 23 | pkt->thoff = thoff; |
| 24 | pkt->fragoff = frag_off; |
| 25 | } |
| 26 | |
| 27 | static inline int __nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt) |
| 28 | { |
| 29 | #if IS_ENABLED(CONFIG_IPV6) |
| 30 | unsigned int flags = IP6_FH_F_AUTH; |
| 31 | struct ipv6hdr *ip6h, _ip6h; |
| 32 | unsigned int thoff = 0; |
| 33 | unsigned short frag_off; |
| 34 | int protohdr; |
| 35 | u32 pkt_len; |
| 36 | |
| 37 | ip6h = skb_header_pointer(pkt->skb, skb_network_offset(pkt->skb), |
| 38 | sizeof(*ip6h), &_ip6h); |
| 39 | if (!ip6h) |
| 40 | return -1; |
| 41 | |
| 42 | if (ip6h->version != 6) |
| 43 | return -1; |
| 44 | |
| 45 | pkt_len = ntohs(ip6h->payload_len); |
| 46 | if (pkt_len + sizeof(*ip6h) > pkt->skb->len) |
| 47 | return -1; |
| 48 | |
| 49 | protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags); |
| 50 | if (protohdr < 0 || thoff > U16_MAX) |
| 51 | return -1; |
| 52 | |
| 53 | pkt->flags = NFT_PKTINFO_L4PROTO; |
| 54 | pkt->tprot = protohdr; |
| 55 | pkt->thoff = thoff; |
| 56 | pkt->fragoff = frag_off; |
| 57 | |
| 58 | return 0; |
| 59 | #else |
| 60 | return -1; |
| 61 | #endif |
| 62 | } |
| 63 | |
| 64 | static inline void nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt) |
| 65 | { |
| 66 | if (__nft_set_pktinfo_ipv6_validate(pkt) < 0) |
| 67 | nft_set_pktinfo_unspec(pkt); |
| 68 | } |
| 69 | |
| 70 | static inline int nft_set_pktinfo_ipv6_ingress(struct nft_pktinfo *pkt) |
| 71 | { |
| 72 | #if IS_ENABLED(CONFIG_IPV6) |
| 73 | unsigned int flags = IP6_FH_F_AUTH; |
| 74 | unsigned short frag_off; |
| 75 | unsigned int thoff = 0; |
| 76 | struct inet6_dev *idev; |
| 77 | struct ipv6hdr *ip6h; |
| 78 | int protohdr; |
| 79 | u32 pkt_len; |
| 80 | |
| 81 | if (!pskb_may_pull(pkt->skb, sizeof(*ip6h))) |
| 82 | return -1; |
| 83 | |
| 84 | ip6h = ipv6_hdr(pkt->skb); |
| 85 | if (ip6h->version != 6) |
| 86 | goto inhdr_error; |
| 87 | |
| 88 | pkt_len = ntohs(ip6h->payload_len); |
| 89 | if (pkt_len + sizeof(*ip6h) > pkt->skb->len) { |
| 90 | idev = __in6_dev_get(nft_in(pkt)); |
| 91 | __IP6_INC_STATS(nft_net(pkt), idev, IPSTATS_MIB_INTRUNCATEDPKTS); |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags); |
| 96 | if (protohdr < 0 || thoff > U16_MAX) |
| 97 | goto inhdr_error; |
| 98 | |
| 99 | pkt->flags = NFT_PKTINFO_L4PROTO; |
| 100 | pkt->tprot = protohdr; |
| 101 | pkt->thoff = thoff; |
| 102 | pkt->fragoff = frag_off; |
| 103 | |
| 104 | return 0; |
| 105 | |
| 106 | inhdr_error: |
| 107 | idev = __in6_dev_get(nft_in(pkt)); |
| 108 | __IP6_INC_STATS(nft_net(pkt), idev, IPSTATS_MIB_INHDRERRORS); |
| 109 | return -1; |
| 110 | #else |
| 111 | return -1; |
| 112 | #endif |
| 113 | } |
| 114 | |
| 115 | #endif |
| 116 |
Warning: This file is not a C or C++ file. It does not have highlighting.