Dmitry V. Levin
b93d52fe3d
strace is now provided under the terms of the GNU Lesser General Public License version 2.1 or later, see COPYING for more details. strace test suite is now provided under the terms of the GNU General Public License version 2 or later, see tests/COPYING for more details.
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*
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* Copyright (c) 2018 Chen Jingpiao <chenjingpiao@gmail.com>
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* Copyright (c) 2018 The strace developers.
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* All rights reserved.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "defs.h"
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#ifdef HAVE_LINUX_NETFILTER_NFNETLINK_H
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# include "print_fields.h"
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# include "nlattr.h"
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# include <netinet/in.h>
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# include <arpa/inet.h>
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# include "netlink.h"
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# include <linux/netfilter/nfnetlink.h>
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# include "xlat/netfilter_versions.h"
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# include "xlat/nl_netfilter_msg_types.h"
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# include "xlat/nl_netfilter_subsys_ids.h"
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bool
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decode_netlink_netfilter(struct tcb *const tcp,
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const struct nlmsghdr *const nlmsghdr,
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const kernel_ulong_t addr,
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const unsigned int len)
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{
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if (nlmsghdr->nlmsg_type == NLMSG_DONE)
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return false;
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struct nfgenmsg nfmsg;
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if (len < sizeof(nfmsg))
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printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX);
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else if (!umove_or_printaddr(tcp, addr, &nfmsg)) {
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const uint8_t subsys_id = (uint8_t) (nlmsghdr->nlmsg_type >> 8);
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uint16_t res_id = ntohs(nfmsg.res_id);
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PRINT_FIELD_XVAL("{", nfmsg, nfgen_family, addrfams, "AF_???");
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PRINT_FIELD_XVAL(", ", nfmsg, version, netfilter_versions,
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"NFNETLINK_???");
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/*
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* Work around wrong endianness in res_id field,
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* see linux commit v4.3-rc1~28^2~47^2~1
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*/
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tprints(", res_id=");
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if (subsys_id == NFNL_SUBSYS_NFTABLES
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&& res_id == NFNL_SUBSYS_NFTABLES) {
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print_xlat_ex(nfmsg.res_id,
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"htons(NFNL_SUBSYS_NFTABLES)",
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XLAT_STYLE_DEFAULT);
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} else if (subsys_id == NFNL_SUBSYS_NFTABLES
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&& nfmsg.res_id == NFNL_SUBSYS_NFTABLES) {
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print_xlat_ex(nfmsg.res_id, "NFNL_SUBSYS_NFTABLES",
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XLAT_STYLE_DEFAULT);
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} else {
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tprintf("htons(%d)", res_id);
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}
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const size_t offset = NLMSG_ALIGN(sizeof(nfmsg));
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if (len > offset) {
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tprints(", ");
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if ((nlmsghdr->nlmsg_type >= NFNL_MSG_BATCH_BEGIN
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&& nlmsghdr->nlmsg_type <= NFNL_MSG_BATCH_END)
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|| nlmsghdr->nlmsg_type < NLMSG_MIN_TYPE)
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printstr_ex(tcp, addr + offset,
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len - offset, QUOTE_FORCE_HEX);
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else
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decode_nlattr(tcp, addr + offset, len - offset,
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NULL, NULL, NULL, 0, NULL);
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}
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}
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return true;
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}
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#endif /* HAVE_LINUX_NETFILTER_NFNETLINK_H */
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