b9e61f0dff
The NAT range to nlattr conversation callbacks and helpers are entirely dead code and are also useless since there are no NAT ranges in conntrack context, they are only used for initially selecting a tuple. The final NAT information is contained in the selected tuples of the conntrack entry. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/ip.h>
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#include <linux/sctp.h>
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#include <linux/module.h>
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#include <net/sctp/checksum.h>
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#include <net/netfilter/nf_nat_protocol.h>
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static u_int16_t nf_sctp_port_rover;
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static void
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sctp_unique_tuple(struct nf_conntrack_tuple *tuple,
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const struct nf_nat_ipv4_range *range,
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enum nf_nat_manip_type maniptype,
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const struct nf_conn *ct)
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{
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nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
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&nf_sctp_port_rover);
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}
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static bool
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sctp_manip_pkt(struct sk_buff *skb,
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unsigned int iphdroff,
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const struct nf_conntrack_tuple *tuple,
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enum nf_nat_manip_type maniptype)
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{
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const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
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struct sk_buff *frag;
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sctp_sctphdr_t *hdr;
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unsigned int hdroff = iphdroff + iph->ihl*4;
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__be32 oldip, newip;
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__be32 crc32;
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if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
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return false;
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iph = (struct iphdr *)(skb->data + iphdroff);
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hdr = (struct sctphdr *)(skb->data + hdroff);
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if (maniptype == NF_NAT_MANIP_SRC) {
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/* Get rid of src ip and src pt */
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oldip = iph->saddr;
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newip = tuple->src.u3.ip;
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hdr->source = tuple->src.u.sctp.port;
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} else {
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/* Get rid of dst ip and dst pt */
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oldip = iph->daddr;
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newip = tuple->dst.u3.ip;
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hdr->dest = tuple->dst.u.sctp.port;
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}
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crc32 = sctp_start_cksum((u8 *)hdr, skb_headlen(skb) - hdroff);
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skb_walk_frags(skb, frag)
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crc32 = sctp_update_cksum((u8 *)frag->data, skb_headlen(frag),
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crc32);
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crc32 = sctp_end_cksum(crc32);
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hdr->checksum = crc32;
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return true;
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}
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static const struct nf_nat_protocol nf_nat_protocol_sctp = {
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.protonum = IPPROTO_SCTP,
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.manip_pkt = sctp_manip_pkt,
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.in_range = nf_nat_proto_in_range,
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.unique_tuple = sctp_unique_tuple,
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#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
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.nlattr_to_range = nf_nat_proto_nlattr_to_range,
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#endif
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};
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static int __init nf_nat_proto_sctp_init(void)
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{
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return nf_nat_protocol_register(&nf_nat_protocol_sctp);
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}
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static void __exit nf_nat_proto_sctp_exit(void)
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{
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nf_nat_protocol_unregister(&nf_nat_protocol_sctp);
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}
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module_init(nf_nat_proto_sctp_init);
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module_exit(nf_nat_proto_sctp_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SCTP NAT protocol helper");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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