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author | Patrick McHardy <kaber@trash.net> | 2008-03-20 14:15:47 (GMT) |
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committer | Patrick McHardy <kaber@trash.net> | 2008-04-14 09:15:46 (GMT) |
commit | 937e0dfd87a8b7946a17161664500fba93eb13fd (patch) | |
tree | 2dae4611ca2fc22d8973dcf0dfbed315de70ff86 /net/ipv4/netfilter/nf_nat_proto_common.c | |
parent | 544473c1664f3a688be949ac078bdee6f4afeef1 (diff) | |
download | linux-fsl-qoriq-937e0dfd87a8b7946a17161664500fba93eb13fd.tar.xz |
[NETFILTER]: nf_nat: add helpers for common NAT protocol operations
Add generic ->in_range and ->unique_tuple ops to avoid duplicating them
again and again for future NAT modules and save a few bytes of text:
net/ipv4/netfilter/nf_nat_proto_tcp.c:
tcp_in_range | -62 (removed)
tcp_unique_tuple | -259 # 271 -> 12, # inlines: 1 -> 0, size inlines: 7 -> 0
2 functions changed, 321 bytes removed
net/ipv4/netfilter/nf_nat_proto_udp.c:
udp_in_range | -62 (removed)
udp_unique_tuple | -259 # 271 -> 12, # inlines: 1 -> 0, size inlines: 7 -> 0
2 functions changed, 321 bytes removed
net/ipv4/netfilter/nf_nat_proto_gre.c:
gre_in_range | -62 (removed)
1 function changed, 62 bytes removed
vmlinux:
5 functions changed, 704 bytes removed
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/ipv4/netfilter/nf_nat_proto_common.c')
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_common.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/nf_nat_proto_common.c b/net/ipv4/netfilter/nf_nat_proto_common.c new file mode 100644 index 0000000..a124213 --- /dev/null +++ b/net/ipv4/netfilter/nf_nat_proto_common.c @@ -0,0 +1,85 @@ +/* (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> + * (C) 2008 Patrick McHardy <kaber@trash.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/types.h> +#include <linux/random.h> +#include <linux/ip.h> + +#include <linux/netfilter.h> +#include <net/netfilter/nf_nat.h> +#include <net/netfilter/nf_nat_core.h> +#include <net/netfilter/nf_nat_rule.h> +#include <net/netfilter/nf_nat_protocol.h> + +int nf_nat_proto_in_range(const struct nf_conntrack_tuple *tuple, + enum nf_nat_manip_type maniptype, + const union nf_conntrack_man_proto *min, + const union nf_conntrack_man_proto *max) +{ + __be16 port; + + if (maniptype == IP_NAT_MANIP_SRC) + port = tuple->src.u.all; + else + port = tuple->dst.u.all; + + return ntohs(port) >= ntohs(min->all) && + ntohs(port) <= ntohs(max->all); +} +EXPORT_SYMBOL_GPL(nf_nat_proto_in_range); + +int nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple, + const struct nf_nat_range *range, + enum nf_nat_manip_type maniptype, + const struct nf_conn *ct, + u_int16_t *rover) +{ + unsigned int range_size, min, i; + __be16 *portptr; + + if (maniptype == IP_NAT_MANIP_SRC) + portptr = &tuple->src.u.all; + else + portptr = &tuple->dst.u.all; + + /* If no range specified... */ + if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) { + /* If it's dst rewrite, can't change port */ + if (maniptype == IP_NAT_MANIP_DST) + return 0; + + if (ntohs(*portptr) < 1024) { + /* Loose convention: >> 512 is credential passing */ + if (ntohs(*portptr) < 512) { + min = 1; + range_size = 511 - min + 1; + } else { + min = 600; + range_size = 1023 - min + 1; + } + } else { + min = 1024; + range_size = 65535 - 1024 + 1; + } + } else { + min = ntohs(range->min.all); + range_size = ntohs(range->max.all) - min + 1; + } + + if (range->flags & IP_NAT_RANGE_PROTO_RANDOM) + *rover = net_random(); + + for (i = 0; i < range_size; i++, (*rover)++) { + *portptr = htons(min + *rover % range_size); + if (!nf_nat_used_tuple(tuple, ct)) + return 1; + } + return 0; +} +EXPORT_SYMBOL_GPL(nf_nat_proto_unique_tuple); |