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![Davide Caratti](/assets/img/avatar_default.png)
SCTP GSO and hardware can do CRC32c computation after netfilter processing, so we can avoid calling sctp_compute_checksum() on skb if skb->ip_summed is equal to CHECKSUM_PARTIAL. Moreover, set skb->ip_summed to CHECKSUM_NONE when the NAT code computes the CRC, to prevent offloaders from computing it again (on ixgbe this resulted in a transmission with wrong L4 checksum). Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
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* Copyright (c) 2008 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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#include <linux/types.h>
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#include <linux/sctp.h>
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#include <net/sctp/checksum.h>
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#include <net/netfilter/nf_nat_l4proto.h>
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static u_int16_t nf_sctp_port_rover;
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static void
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sctp_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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nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
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&nf_sctp_port_rover);
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}
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static bool
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sctp_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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sctp_sctphdr_t *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 sctphdr *)(skb->data + hdroff);
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if (maniptype == NF_NAT_MANIP_SRC) {
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/* Get rid of src port */
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hdr->source = tuple->src.u.sctp.port;
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} else {
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/* Get rid of dst port */
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hdr->dest = tuple->dst.u.sctp.port;
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}
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if (skb->ip_summed != CHECKSUM_PARTIAL) {
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hdr->checksum = sctp_compute_cksum(skb, hdroff);
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skb->ip_summed = CHECKSUM_NONE;
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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_sctp = {
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.l4proto = IPPROTO_SCTP,
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.manip_pkt = sctp_manip_pkt,
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.in_range = nf_nat_l4proto_in_range,
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.unique_tuple = sctp_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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