68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NF_TABLES_IPV4_H_
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#define _NF_TABLES_IPV4_H_
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#include <net/netfilter/nf_tables.h>
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#include <net/ip.h>
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static inline void
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nft_set_pktinfo_ipv4(struct nft_pktinfo *pkt,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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struct iphdr *ip;
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nft_set_pktinfo(pkt, skb, state);
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ip = ip_hdr(pkt->skb);
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pkt->tprot_set = true;
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pkt->tprot = ip->protocol;
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pkt->xt.thoff = ip_hdrlen(pkt->skb);
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pkt->xt.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
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}
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static inline int
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__nft_set_pktinfo_ipv4_validate(struct nft_pktinfo *pkt,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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struct iphdr *iph, _iph;
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u32 len, thoff;
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iph = skb_header_pointer(skb, skb_network_offset(skb), sizeof(*iph),
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&_iph);
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if (!iph)
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return -1;
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if (iph->ihl < 5 || iph->version != 4)
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return -1;
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len = ntohs(iph->tot_len);
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thoff = iph->ihl * 4;
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if (skb->len < len)
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return -1;
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else if (len < thoff)
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return -1;
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pkt->tprot_set = true;
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pkt->tprot = iph->protocol;
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pkt->xt.thoff = thoff;
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pkt->xt.fragoff = ntohs(iph->frag_off) & IP_OFFSET;
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return 0;
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}
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static inline void
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nft_set_pktinfo_ipv4_validate(struct nft_pktinfo *pkt,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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nft_set_pktinfo(pkt, skb, state);
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if (__nft_set_pktinfo_ipv4_validate(pkt, skb, state) < 0)
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nft_set_pktinfo_proto_unspec(pkt, skb);
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}
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extern struct nft_af_info nft_af_ipv4;
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#endif
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