| /* |
| * Copyright (c) 2018 Chen Jingpiao <chenjingpiao@gmail.com> |
| * Copyright (c) 2018 The strace developers. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "defs.h" |
| |
| #ifdef HAVE_LINUX_NETFILTER_NFNETLINK_H |
| |
| # include "print_fields.h" |
| # include "nlattr.h" |
| |
| # include <netinet/in.h> |
| # include <arpa/inet.h> |
| # include "netlink.h" |
| # include <linux/netfilter/nfnetlink.h> |
| |
| # include "xlat/netfilter_versions.h" |
| # include "xlat/nl_netfilter_msg_types.h" |
| # include "xlat/nl_netfilter_subsys_ids.h" |
| |
| bool |
| decode_netlink_netfilter(struct tcb *const tcp, |
| const struct nlmsghdr *const nlmsghdr, |
| const kernel_ulong_t addr, |
| const unsigned int len) |
| { |
| if (nlmsghdr->nlmsg_type == NLMSG_DONE) |
| return false; |
| |
| struct nfgenmsg nfmsg; |
| |
| if (len < sizeof(nfmsg)) |
| printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX); |
| else if (!umove_or_printaddr(tcp, addr, &nfmsg)) { |
| const uint8_t subsys_id = (uint8_t) (nlmsghdr->nlmsg_type >> 8); |
| uint16_t res_id = ntohs(nfmsg.res_id); |
| |
| PRINT_FIELD_XVAL("{", nfmsg, nfgen_family, addrfams, "AF_???"); |
| PRINT_FIELD_XVAL(", ", nfmsg, version, netfilter_versions, |
| "NFNETLINK_???"); |
| |
| /* |
| * Work around wrong endianness in res_id field, |
| * see linux commit v4.3-rc1~28^2~47^2~1 |
| */ |
| tprints(", res_id="); |
| if (subsys_id == NFNL_SUBSYS_NFTABLES |
| && res_id == NFNL_SUBSYS_NFTABLES) { |
| print_xlat_ex(nfmsg.res_id, |
| "htons(NFNL_SUBSYS_NFTABLES)", |
| XLAT_STYLE_DEFAULT); |
| } else if (subsys_id == NFNL_SUBSYS_NFTABLES |
| && nfmsg.res_id == NFNL_SUBSYS_NFTABLES) { |
| print_xlat_ex(nfmsg.res_id, "NFNL_SUBSYS_NFTABLES", |
| XLAT_STYLE_DEFAULT); |
| } else { |
| tprintf("htons(%d)", res_id); |
| } |
| |
| const size_t offset = NLMSG_ALIGN(sizeof(nfmsg)); |
| if (len > offset) { |
| tprints(", "); |
| if ((nlmsghdr->nlmsg_type >= NFNL_MSG_BATCH_BEGIN |
| && nlmsghdr->nlmsg_type <= NFNL_MSG_BATCH_END) |
| || nlmsghdr->nlmsg_type < NLMSG_MIN_TYPE) |
| printstr_ex(tcp, addr + offset, |
| len - offset, QUOTE_FORCE_HEX); |
| else |
| decode_nlattr(tcp, addr + offset, len - offset, |
| NULL, NULL, NULL, 0, NULL); |
| } |
| } |
| |
| return true; |
| } |
| |
| #endif /* HAVE_LINUX_NETFILTER_NFNETLINK_H */ |