projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| bbde9fc1 PNA |
1 | /* |
| 2 | * (C) 2007 by Sebastian Claßen <sebastian.classen@freenet.ag> | |
| 3 | * (C) 2007-2010 by Jan Engelhardt <jengelh@medozas.de> | |
| 4 | * | |
| 5 | * Extracted from xt_TEE.c | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify it | |
| 8 | * under the terms of the GNU General Public License version 2 or later, as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/percpu.h> | |
| 13 | #include <linux/skbuff.h> | |
| a82b0e63 | 14 | #include <linux/netfilter.h> |
| bbde9fc1 PNA |
15 | #include <net/ipv6.h> |
| 16 | #include <net/ip6_route.h> | |
| 17 | #include <net/netfilter/ipv6/nf_dup_ipv6.h> | |
| 18 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) | |
| 19 | #include <net/netfilter/nf_conntrack.h> | |
| 20 | #endif | |
| 21 | ||
| 206e8c00 EB |
22 | static bool nf_dup_ipv6_route(struct net *net, struct sk_buff *skb, |
| 23 | const struct in6_addr *gw, int oif) | |
| bbde9fc1 PNA |
24 | { |
| 25 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
| bbde9fc1 PNA |
26 | struct dst_entry *dst; |
| 27 | struct flowi6 fl6; | |
| 28 | ||
| 29 | memset(&fl6, 0, sizeof(fl6)); | |
| 30 | if (oif != -1) | |
| 31 | fl6.flowi6_oif = oif; | |
| 32 | ||
| 33 | fl6.daddr = *gw; | |
| 59e26423 PNA |
34 | fl6.flowlabel = (__force __be32)(((iph->flow_lbl[0] & 0xF) << 16) | |
| 35 | (iph->flow_lbl[1] << 8) | iph->flow_lbl[2]); | |
| 83170f3b | 36 | fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH; |
| bbde9fc1 PNA |
37 | dst = ip6_route_output(net, NULL, &fl6); |
| 38 | if (dst->error) { | |
| 39 | dst_release(dst); | |
| 40 | return false; | |
| 41 | } | |
| 42 | skb_dst_drop(skb); | |
| 43 | skb_dst_set(skb, dst); | |
| 44 | skb->dev = dst->dev; | |
| 45 | skb->protocol = htons(ETH_P_IPV6); | |
| 46 | ||
| 47 | return true; | |
| 48 | } | |
| 49 | ||
| 206e8c00 | 50 | void nf_dup_ipv6(struct net *net, struct sk_buff *skb, unsigned int hooknum, |
| bbde9fc1 PNA |
51 | const struct in6_addr *gw, int oif) |
| 52 | { | |
| d877f071 | 53 | if (this_cpu_read(nf_skb_duplicated)) |
| bbde9fc1 PNA |
54 | return; |
| 55 | skb = pskb_copy(skb, GFP_ATOMIC); | |
| 56 | if (skb == NULL) | |
| 57 | return; | |
| 58 | ||
| 59 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) | |
| 60 | nf_conntrack_put(skb->nfct); | |
| 61 | skb->nfct = &nf_ct_untracked_get()->ct_general; | |
| 62 | skb->nfctinfo = IP_CT_NEW; | |
| 63 | nf_conntrack_get(skb->nfct); | |
| 64 | #endif | |
| 65 | if (hooknum == NF_INET_PRE_ROUTING || | |
| 66 | hooknum == NF_INET_LOCAL_IN) { | |
| 67 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
| 68 | --iph->hop_limit; | |
| 69 | } | |
| 206e8c00 | 70 | if (nf_dup_ipv6_route(net, skb, gw, oif)) { |
| bbde9fc1 | 71 | __this_cpu_write(nf_skb_duplicated, true); |
| 33224b16 | 72 | ip6_local_out(net, skb->sk, skb); |
| bbde9fc1 PNA |
73 | __this_cpu_write(nf_skb_duplicated, false); |
| 74 | } else { | |
| 75 | kfree_skb(skb); | |
| 76 | } | |
| 77 | } | |
| 78 | EXPORT_SYMBOL_GPL(nf_dup_ipv6); | |
| 79 | ||
| 80 | MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>"); | |
| 81 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); | |
| 82 | MODULE_DESCRIPTION("nf_dup_ipv6: IPv6 packet duplication"); | |
| 83 | MODULE_LICENSE("GPL"); |