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Linux/net/netfilter/nf_nat_proto_sctp.c

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  1 /*
  2  * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  */
  8 
  9 #include <linux/types.h>
 10 #include <linux/init.h>
 11 #include <linux/sctp.h>
 12 #include <linux/module.h>
 13 #include <net/sctp/checksum.h>
 14 
 15 #include <net/netfilter/nf_nat_l4proto.h>
 16 
 17 static u_int16_t nf_sctp_port_rover;
 18 
 19 static void
 20 sctp_unique_tuple(const struct nf_nat_l3proto *l3proto,
 21                   struct nf_conntrack_tuple *tuple,
 22                   const struct nf_nat_range *range,
 23                   enum nf_nat_manip_type maniptype,
 24                   const struct nf_conn *ct)
 25 {
 26         nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
 27                                     &nf_sctp_port_rover);
 28 }
 29 
 30 static bool
 31 sctp_manip_pkt(struct sk_buff *skb,
 32                const struct nf_nat_l3proto *l3proto,
 33                unsigned int iphdroff, unsigned int hdroff,
 34                const struct nf_conntrack_tuple *tuple,
 35                enum nf_nat_manip_type maniptype)
 36 {
 37         struct sk_buff *frag;
 38         sctp_sctphdr_t *hdr;
 39         __be32 crc32;
 40 
 41         if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
 42                 return false;
 43 
 44         hdr = (struct sctphdr *)(skb->data + hdroff);
 45 
 46         if (maniptype == NF_NAT_MANIP_SRC) {
 47                 /* Get rid of src port */
 48                 hdr->source = tuple->src.u.sctp.port;
 49         } else {
 50                 /* Get rid of dst port */
 51                 hdr->dest = tuple->dst.u.sctp.port;
 52         }
 53 
 54         crc32 = sctp_start_cksum((u8 *)hdr, skb_headlen(skb) - hdroff);
 55         skb_walk_frags(skb, frag)
 56                 crc32 = sctp_update_cksum((u8 *)frag->data, skb_headlen(frag),
 57                                           crc32);
 58         crc32 = sctp_end_cksum(crc32);
 59         hdr->checksum = crc32;
 60 
 61         return true;
 62 }
 63 
 64 static const struct nf_nat_l4proto nf_nat_l4proto_sctp = {
 65         .l4proto                = IPPROTO_SCTP,
 66         .manip_pkt              = sctp_manip_pkt,
 67         .in_range               = nf_nat_l4proto_in_range,
 68         .unique_tuple           = sctp_unique_tuple,
 69 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 70         .nlattr_to_range        = nf_nat_l4proto_nlattr_to_range,
 71 #endif
 72 };
 73 
 74 static int __init nf_nat_proto_sctp_init(void)
 75 {
 76         int err;
 77 
 78         err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
 79         if (err < 0)
 80                 goto err1;
 81         err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_sctp);
 82         if (err < 0)
 83                 goto err2;
 84         return 0;
 85 
 86 err2:
 87         nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
 88 err1:
 89         return err;
 90 }
 91 
 92 static void __exit nf_nat_proto_sctp_exit(void)
 93 {
 94         nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_sctp);
 95         nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
 96 }
 97 
 98 module_init(nf_nat_proto_sctp_init);
 99 module_exit(nf_nat_proto_sctp_exit);
100 
101 MODULE_LICENSE("GPL");
102 MODULE_DESCRIPTION("SCTP NAT protocol helper");
103 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
104 

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