projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c622345 PNA |
1 | /* |
| 2 | * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org> | |
| 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 | ||
| 10 | #include <linux/skbuff.h> | |
| 11 | #include <linux/netfilter.h> | |
| 12 | #include <linux/netfilter/nfnetlink.h> | |
| 13 | #include <linux/netfilter/nfnetlink_queue.h> | |
| 14 | #include <net/netfilter/nf_conntrack.h> | |
| 15 | ||
| 16 | struct nf_conn *nfqnl_ct_get(struct sk_buff *entskb, size_t *size, | |
| 17 | enum ip_conntrack_info *ctinfo) | |
| 18 | { | |
| 19 | struct nfq_ct_hook *nfq_ct; | |
| 20 | struct nf_conn *ct; | |
| 21 | ||
| 22 | /* rcu_read_lock()ed by __nf_queue already. */ | |
| 23 | nfq_ct = rcu_dereference(nfq_ct_hook); | |
| 24 | if (nfq_ct == NULL) | |
| 25 | return NULL; | |
| 26 | ||
| 27 | ct = nf_ct_get(entskb, ctinfo); | |
| 28 | if (ct) { | |
| 29 | if (!nf_ct_is_untracked(ct)) | |
| 30 | *size += nfq_ct->build_size(ct); | |
| 31 | else | |
| 32 | ct = NULL; | |
| 33 | } | |
| 34 | return ct; | |
| 35 | } | |
| 36 | ||
| 37 | struct nf_conn * | |
| 38 | nfqnl_ct_parse(const struct sk_buff *skb, const struct nlattr *attr, | |
| 39 | enum ip_conntrack_info *ctinfo) | |
| 40 | { | |
| 41 | struct nfq_ct_hook *nfq_ct; | |
| 42 | struct nf_conn *ct; | |
| 43 | ||
| 44 | /* rcu_read_lock()ed by __nf_queue already. */ | |
| 45 | nfq_ct = rcu_dereference(nfq_ct_hook); | |
| 46 | if (nfq_ct == NULL) | |
| 47 | return NULL; | |
| 48 | ||
| 49 | ct = nf_ct_get(skb, ctinfo); | |
| 50 | if (ct && !nf_ct_is_untracked(ct)) | |
| 51 | nfq_ct->parse(attr, ct); | |
| 52 | ||
| 53 | return ct; | |
| 54 | } | |
| 55 | ||
| 56 | int nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct, | |
| 57 | enum ip_conntrack_info ctinfo) | |
| 58 | { | |
| 59 | struct nfq_ct_hook *nfq_ct; | |
| 60 | struct nlattr *nest_parms; | |
| 61 | u_int32_t tmp; | |
| 62 | ||
| 63 | nfq_ct = rcu_dereference(nfq_ct_hook); | |
| 64 | if (nfq_ct == NULL) | |
| 65 | return 0; | |
| 66 | ||
| 67 | nest_parms = nla_nest_start(skb, NFQA_CT | NLA_F_NESTED); | |
| 68 | if (!nest_parms) | |
| 69 | goto nla_put_failure; | |
| 70 | ||
| 71 | if (nfq_ct->build(skb, ct) < 0) | |
| 72 | goto nla_put_failure; | |
| 73 | ||
| 74 | nla_nest_end(skb, nest_parms); | |
| 75 | ||
| 76 | tmp = ctinfo; | |
| 77 | if (nla_put_be32(skb, NFQA_CT_INFO, htonl(tmp))) | |
| 78 | goto nla_put_failure; | |
| 79 | ||
| 80 | return 0; | |
| 81 | ||
| 82 | nla_put_failure: | |
| 83 | return -1; | |
| 84 | } | |
| 85 | ||
| 86 | void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct, | |
| 87 | enum ip_conntrack_info ctinfo, int diff) | |
| 88 | { | |
| d584a61a | 89 | struct nfq_ct_nat_hook *nfq_nat_ct; |
| 7c622345 | 90 | |
| d584a61a PNA |
91 | nfq_nat_ct = rcu_dereference(nfq_ct_nat_hook); |
| 92 | if (nfq_nat_ct == NULL) | |
| 7c622345 PNA |
93 | return; |
| 94 | ||
| 95 | if ((ct->status & IPS_NAT_MASK) && diff) | |
| d584a61a | 96 | nfq_nat_ct->seq_adjust(skb, ct, ctinfo, diff); |
| 7c622345 | 97 | } |