mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
synced 2025-09-07 13:15:12 +02:00
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
#ifndef _IP_SET_GETPORT_H
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#define _IP_SET_GETPORT_H
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#ifdef __KERNEL__
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#define INVALID_PORT (MAX_RANGE + 1)
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/* We must handle non-linear skbs */
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static inline ip_set_ip_t
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get_port(const struct sk_buff *skb, u_int32_t flags)
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{
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struct iphdr *iph = ip_hdr(skb);
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u_int16_t offset = ntohs(iph->frag_off) & IP_OFFSET;
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switch (iph->protocol) {
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case IPPROTO_TCP: {
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struct tcphdr tcph;
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/* See comments at tcp_match in ip_tables.c */
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if (offset)
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return INVALID_PORT;
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if (skb_copy_bits(skb, ip_hdr(skb)->ihl*4, &tcph, sizeof(tcph)) < 0)
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/* No choice either */
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return INVALID_PORT;
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return ntohs(flags & IPSET_SRC ?
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tcph.source : tcph.dest);
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}
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case IPPROTO_UDP: {
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struct udphdr udph;
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if (offset)
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return INVALID_PORT;
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if (skb_copy_bits(skb, ip_hdr(skb)->ihl*4, &udph, sizeof(udph)) < 0)
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/* No choice either */
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return INVALID_PORT;
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return ntohs(flags & IPSET_SRC ?
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udph.source : udph.dest);
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}
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default:
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return INVALID_PORT;
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}
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}
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#endif /* __KERNEL__ */
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#endif /*_IP_SET_GETPORT_H*/
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