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![Tom Herbert](/assets/img/avatar_default.png)
inet_proto_csum_replace4,2,16 take a pseudohdr argument which indicates the checksum field carries a pseudo header. This argument should be a boolean instead of an int. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*
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* Copyright (c) 2011 Patrick Mchardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Based on Rusty Russell's IPv4 ICMP NAT code. Development of IPv6
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* NAT funded by Astaro.
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/icmpv6.h>
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#include <linux/netfilter.h>
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#include <net/netfilter/nf_nat.h>
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#include <net/netfilter/nf_nat_core.h>
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#include <net/netfilter/nf_nat_l3proto.h>
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#include <net/netfilter/nf_nat_l4proto.h>
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static bool
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icmpv6_in_range(const struct nf_conntrack_tuple *tuple,
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enum nf_nat_manip_type maniptype,
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const union nf_conntrack_man_proto *min,
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const union nf_conntrack_man_proto *max)
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{
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return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) &&
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ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id);
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}
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static void
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icmpv6_unique_tuple(const struct nf_nat_l3proto *l3proto,
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struct nf_conntrack_tuple *tuple,
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const struct nf_nat_range *range,
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enum nf_nat_manip_type maniptype,
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const struct nf_conn *ct)
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{
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static u16 id;
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unsigned int range_size;
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unsigned int i;
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range_size = ntohs(range->max_proto.icmp.id) -
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ntohs(range->min_proto.icmp.id) + 1;
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if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED))
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range_size = 0xffff;
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for (i = 0; ; ++id) {
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tuple->src.u.icmp.id = htons(ntohs(range->min_proto.icmp.id) +
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(id % range_size));
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if (++i == range_size || !nf_nat_used_tuple(tuple, ct))
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return;
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}
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}
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static bool
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icmpv6_manip_pkt(struct sk_buff *skb,
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const struct nf_nat_l3proto *l3proto,
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unsigned int iphdroff, unsigned int hdroff,
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const struct nf_conntrack_tuple *tuple,
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enum nf_nat_manip_type maniptype)
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{
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struct icmp6hdr *hdr;
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if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
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return false;
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hdr = (struct icmp6hdr *)(skb->data + hdroff);
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l3proto->csum_update(skb, iphdroff, &hdr->icmp6_cksum,
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tuple, maniptype);
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if (hdr->icmp6_type == ICMPV6_ECHO_REQUEST ||
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hdr->icmp6_type == ICMPV6_ECHO_REPLY) {
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inet_proto_csum_replace2(&hdr->icmp6_cksum, skb,
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hdr->icmp6_identifier,
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tuple->src.u.icmp.id, false);
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hdr->icmp6_identifier = tuple->src.u.icmp.id;
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}
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return true;
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}
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const struct nf_nat_l4proto nf_nat_l4proto_icmpv6 = {
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.l4proto = IPPROTO_ICMPV6,
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.manip_pkt = icmpv6_manip_pkt,
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.in_range = icmpv6_in_range,
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.unique_tuple = icmpv6_unique_tuple,
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#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
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.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
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#endif
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};
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