diff options
Diffstat (limited to 'include/net/netfilter/nf_tables_ipv6.h')
-rw-r--r-- | include/net/netfilter/nf_tables_ipv6.h | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_tables_ipv6.h b/include/net/netfilter/nf_tables_ipv6.h new file mode 100644 index 000000000..867de29f3 --- /dev/null +++ b/include/net/netfilter/nf_tables_ipv6.h @@ -0,0 +1,119 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _NF_TABLES_IPV6_H_ +#define _NF_TABLES_IPV6_H_ + +#include <linux/netfilter_ipv6/ip6_tables.h> +#include <net/ipv6.h> +#include <net/netfilter/nf_tables.h> + +static inline void nft_set_pktinfo_ipv6(struct nft_pktinfo *pkt, + struct sk_buff *skb) +{ + unsigned int flags = IP6_FH_F_AUTH; + int protohdr, thoff = 0; + unsigned short frag_off; + + protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags); + if (protohdr < 0) { + nft_set_pktinfo_unspec(pkt, skb); + return; + } + + pkt->tprot_set = true; + pkt->tprot = protohdr; + pkt->xt.thoff = thoff; + pkt->xt.fragoff = frag_off; +} + +static inline int __nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt, + struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_IPV6) + unsigned int flags = IP6_FH_F_AUTH; + struct ipv6hdr *ip6h, _ip6h; + unsigned int thoff = 0; + unsigned short frag_off; + int protohdr; + u32 pkt_len; + + ip6h = skb_header_pointer(skb, skb_network_offset(skb), sizeof(*ip6h), + &_ip6h); + if (!ip6h) + return -1; + + if (ip6h->version != 6) + return -1; + + pkt_len = ntohs(ip6h->payload_len); + if (pkt_len + sizeof(*ip6h) > skb->len) + return -1; + + protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags); + if (protohdr < 0) + return -1; + + pkt->tprot_set = true; + pkt->tprot = protohdr; + pkt->xt.thoff = thoff; + pkt->xt.fragoff = frag_off; + + return 0; +#else + return -1; +#endif +} + +static inline void nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt, + struct sk_buff *skb) +{ + if (__nft_set_pktinfo_ipv6_validate(pkt, skb) < 0) + nft_set_pktinfo_unspec(pkt, skb); +} + +static inline int nft_set_pktinfo_ipv6_ingress(struct nft_pktinfo *pkt, + struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_IPV6) + unsigned int flags = IP6_FH_F_AUTH; + unsigned short frag_off; + unsigned int thoff = 0; + struct inet6_dev *idev; + struct ipv6hdr *ip6h; + int protohdr; + u32 pkt_len; + + if (!pskb_may_pull(skb, sizeof(*ip6h))) + return -1; + + ip6h = ipv6_hdr(skb); + if (ip6h->version != 6) + goto inhdr_error; + + pkt_len = ntohs(ip6h->payload_len); + if (pkt_len + sizeof(*ip6h) > skb->len) { + idev = __in6_dev_get(nft_in(pkt)); + __IP6_INC_STATS(nft_net(pkt), idev, IPSTATS_MIB_INTRUNCATEDPKTS); + return -1; + } + + protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags); + if (protohdr < 0) + goto inhdr_error; + + pkt->tprot_set = true; + pkt->tprot = protohdr; + pkt->xt.thoff = thoff; + pkt->xt.fragoff = frag_off; + + return 0; + +inhdr_error: + idev = __in6_dev_get(nft_in(pkt)); + __IP6_INC_STATS(nft_net(pkt), idev, IPSTATS_MIB_INHDRERRORS); + return -1; +#else + return -1; +#endif +} + +#endif |