projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9d908a69 PM |
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/ip.h> | |
| 12 | #include <linux/sctp.h> | |
| 3a9a231d | 13 | #include <linux/module.h> |
| 9d908a69 PM |
14 | #include <net/sctp/checksum.h> |
| 15 | ||
| 16 | #include <net/netfilter/nf_nat_protocol.h> | |
| 17 | ||
| 18 | static u_int16_t nf_sctp_port_rover; | |
| 19 | ||
| f43dc98b | 20 | static void |
| 9d908a69 PM |
21 | sctp_unique_tuple(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 | { | |
| f43dc98b CG |
26 | nf_nat_proto_unique_tuple(tuple, range, maniptype, ct, |
| 27 | &nf_sctp_port_rover); | |
| 9d908a69 PM |
28 | } |
| 29 | ||
| f2ea825f | 30 | static bool |
| 9d908a69 PM |
31 | sctp_manip_pkt(struct sk_buff *skb, |
| 32 | unsigned int iphdroff, | |
| 33 | const struct nf_conntrack_tuple *tuple, | |
| 34 | enum nf_nat_manip_type maniptype) | |
| 35 | { | |
| 36 | const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff); | |
| 343a9972 | 37 | struct sk_buff *frag; |
| 9d908a69 PM |
38 | sctp_sctphdr_t *hdr; |
| 39 | unsigned int hdroff = iphdroff + iph->ihl*4; | |
| 40 | __be32 oldip, newip; | |
| 336d3262 | 41 | __be32 crc32; |
| 9d908a69 PM |
42 | |
| 43 | if (!skb_make_writable(skb, hdroff + sizeof(*hdr))) | |
| f2ea825f | 44 | return false; |
| 9d908a69 PM |
45 | |
| 46 | iph = (struct iphdr *)(skb->data + iphdroff); | |
| 47 | hdr = (struct sctphdr *)(skb->data + hdroff); | |
| 48 | ||
| 49 | if (maniptype == IP_NAT_MANIP_SRC) { | |
| 50 | /* Get rid of src ip and src pt */ | |
| 51 | oldip = iph->saddr; | |
| 52 | newip = tuple->src.u3.ip; | |
| 53 | hdr->source = tuple->src.u.sctp.port; | |
| 54 | } else { | |
| 55 | /* Get rid of dst ip and dst pt */ | |
| 56 | oldip = iph->daddr; | |
| 57 | newip = tuple->dst.u3.ip; | |
| 58 | hdr->dest = tuple->dst.u.sctp.port; | |
| 59 | } | |
| 60 | ||
| 61 | crc32 = sctp_start_cksum((u8 *)hdr, skb_headlen(skb) - hdroff); | |
| 0808dc80 | 62 | skb_walk_frags(skb, frag) |
| 343a9972 | 63 | crc32 = sctp_update_cksum((u8 *)frag->data, skb_headlen(frag), |
| 9d908a69 PM |
64 | crc32); |
| 65 | crc32 = sctp_end_cksum(crc32); | |
| 336d3262 | 66 | hdr->checksum = crc32; |
| 9d908a69 | 67 | |
| f2ea825f | 68 | return true; |
| 9d908a69 PM |
69 | } |
| 70 | ||
| 71 | static const struct nf_nat_protocol nf_nat_protocol_sctp = { | |
| 72 | .protonum = IPPROTO_SCTP, | |
| 73 | .me = THIS_MODULE, | |
| 74 | .manip_pkt = sctp_manip_pkt, | |
| 75 | .in_range = nf_nat_proto_in_range, | |
| 76 | .unique_tuple = sctp_unique_tuple, | |
| 77 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) | |
| 78 | .range_to_nlattr = nf_nat_proto_range_to_nlattr, | |
| 79 | .nlattr_to_range = nf_nat_proto_nlattr_to_range, | |
| 80 | #endif | |
| 81 | }; | |
| 82 | ||
| 83 | static int __init nf_nat_proto_sctp_init(void) | |
| 84 | { | |
| 85 | return nf_nat_protocol_register(&nf_nat_protocol_sctp); | |
| 86 | } | |
| 87 | ||
| 88 | static void __exit nf_nat_proto_sctp_exit(void) | |
| 89 | { | |
| 90 | nf_nat_protocol_unregister(&nf_nat_protocol_sctp); | |
| 91 | } | |
| 92 | ||
| 93 | module_init(nf_nat_proto_sctp_init); | |
| 94 | module_exit(nf_nat_proto_sctp_exit); | |
| 95 | ||
| 96 | MODULE_LICENSE("GPL"); | |
| 97 | MODULE_DESCRIPTION("SCTP NAT protocol helper"); | |
| 98 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |