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log_msg.c

/*
 * lib/netfilter/log_msg.c    Netfilter Log Message
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation version 2.1
 *    of the License.
 *
 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
 * Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
 * Copyright (c) 2007 Secure Computing Corporation
 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
 */

/**
 * @ingroup nfnl
 * @defgroup log Log
 * @brief
 * @{
 */

#include <sys/types.h>
#include <linux/netfilter/nfnetlink_log.h>

#include <netlink-local.h>
#include <netlink/attr.h>
#include <netlink/netfilter/nfnl.h>
#include <netlink/netfilter/log_msg.h>

#if __BYTE_ORDER == __BIG_ENDIAN
static uint64_t ntohll(uint64_t x)
{
      return x;
}
#elif __BYTE_ORDER == __LITTLE_ENDIAN
static uint64_t ntohll(uint64_t x)
{
      return __bswap_64(x);
}
#endif

static struct nla_policy log_msg_policy[NFULA_MAX+1] = {
      [NFULA_PACKET_HDR]            = {
            .minlen = sizeof(struct nfulnl_msg_packet_hdr)
      },
      [NFULA_MARK]                  = { .type = NLA_U32 },
      [NFULA_TIMESTAMP]       = {
            .minlen = sizeof(struct nfulnl_msg_packet_timestamp)
      },
      [NFULA_IFINDEX_INDEV]         = { .type = NLA_U32 },
      [NFULA_IFINDEX_OUTDEV]        = { .type = NLA_U32 },
      [NFULA_IFINDEX_PHYSINDEV]     = { .type = NLA_U32 },
      [NFULA_IFINDEX_PHYSOUTDEV]    = { .type = NLA_U32 },
      [NFULA_HWADDR]                = {
            .minlen = sizeof(struct nfulnl_msg_packet_hw)
      },
      //[NFULA_PAYLOAD]
      [NFULA_PREFIX]                = { .type = NLA_STRING, },
      [NFULA_UID]             = { .type = NLA_U32 },
      [NFULA_GID]             = { .type = NLA_U32 },
      [NFULA_SEQ]             = { .type = NLA_U32 },
      [NFULA_SEQ_GLOBAL]            = { .type = NLA_U32 },
};

int nfnlmsg_log_msg_parse(struct nlmsghdr *nlh, struct nfnl_log_msg **result)
{
      struct nfnl_log_msg *msg;
      struct nlattr *tb[NFULA_MAX+1];
      struct nlattr *attr;
      int err;

      msg = nfnl_log_msg_alloc();
      if (!msg)
            return -NLE_NOMEM;

      msg->ce_msgtype = nlh->nlmsg_type;

      err = nlmsg_parse(nlh, sizeof(struct nfgenmsg), tb, NFULA_MAX,
                    log_msg_policy);
      if (err < 0)
            goto errout;

      nfnl_log_msg_set_family(msg, nfnlmsg_family(nlh));

      attr = tb[NFULA_PACKET_HDR];
      if (attr) {
            struct nfulnl_msg_packet_hdr *hdr = nla_data(attr);

            if (hdr->hw_protocol)
                  nfnl_log_msg_set_hwproto(msg, hdr->hw_protocol);
            nfnl_log_msg_set_hook(msg, hdr->hook);
      }

      attr = tb[NFULA_MARK];
      if (attr)
            nfnl_log_msg_set_mark(msg, ntohl(nla_get_u32(attr)));

      attr = tb[NFULA_TIMESTAMP];
      if (attr) {
            struct nfulnl_msg_packet_timestamp *timestamp = nla_data(attr);
            struct timeval tv;

            tv.tv_sec = ntohll(timestamp->sec);
            tv.tv_usec = ntohll(timestamp->usec);
            nfnl_log_msg_set_timestamp(msg, &tv);
      }

      attr = tb[NFULA_IFINDEX_INDEV];
      if (attr)
            nfnl_log_msg_set_indev(msg, ntohl(nla_get_u32(attr)));

      attr = tb[NFULA_IFINDEX_OUTDEV];
      if (attr)
            nfnl_log_msg_set_outdev(msg, ntohl(nla_get_u32(attr)));

      attr = tb[NFULA_IFINDEX_PHYSINDEV];
      if (attr)
            nfnl_log_msg_set_physindev(msg, ntohl(nla_get_u32(attr)));

      attr = tb[NFULA_IFINDEX_PHYSOUTDEV];
      if (attr)
            nfnl_log_msg_set_physoutdev(msg, ntohl(nla_get_u32(attr)));

      attr = tb[NFULA_HWADDR];
      if (attr) {
            struct nfulnl_msg_packet_hw *hw = nla_data(attr);

            nfnl_log_msg_set_hwaddr(msg, hw->hw_addr, ntohs(hw->hw_addrlen));
      }

      attr = tb[NFULA_PAYLOAD];
      if (attr) {
            err = nfnl_log_msg_set_payload(msg, nla_data(attr), nla_len(attr));
            if (err < 0)
                  goto errout;
      }

      attr = tb[NFULA_PREFIX];
      if (attr) {
            err = nfnl_log_msg_set_prefix(msg, nla_data(attr));
            if (err < 0)
                  goto errout;
      }

      attr = tb[NFULA_UID];
      if (attr)
            nfnl_log_msg_set_uid(msg, ntohl(nla_get_u32(attr)));

      attr = tb[NFULA_GID];
      if (attr)
            nfnl_log_msg_set_gid(msg, ntohl(nla_get_u32(attr)));

      attr = tb[NFULA_SEQ];
      if (attr)
            nfnl_log_msg_set_seq(msg, ntohl(nla_get_u32(attr)));

      attr = tb[NFULA_SEQ_GLOBAL];
      if (attr)
            nfnl_log_msg_set_seq_global(msg, ntohl(nla_get_u32(attr)));

      *result = msg;
      return 0;

errout:
      nfnl_log_msg_put(msg);
      return err;
}

static int log_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
                    struct nlmsghdr *nlh, struct nl_parser_param *pp)
{
      struct nfnl_log_msg *msg;
      int err;

      if ((err = nfnlmsg_log_msg_parse(nlh, &msg)) < 0)
            goto errout;

      err = pp->pp_cb((struct nl_object *) msg, pp);
errout:
      nfnl_log_msg_put(msg);
      return err;
}

/** @} */

#define NFNLMSG_LOG_TYPE(type) NFNLMSG_TYPE(NFNL_SUBSYS_ULOG, (type))
static struct nl_cache_ops nfnl_log_msg_ops = {
      .co_name          = "netfilter/log_msg",
      .co_hdrsize       = NFNL_HDRLEN,
      .co_msgtypes            = {
            { NFNLMSG_LOG_TYPE(NFULNL_MSG_PACKET), NL_ACT_NEW, "new" },
            END_OF_MSGTYPES_LIST,
      },
      .co_protocol            = NETLINK_NETFILTER,
      .co_msg_parser          = log_msg_parser,
      .co_obj_ops       = &log_msg_obj_ops,
};

static void __init log_msg_init(void)
{
      nl_cache_mngt_register(&nfnl_log_msg_ops);
}

static void __exit log_msg_exit(void)
{
      nl_cache_mngt_unregister(&nfnl_log_msg_ops);
}

/** @} */

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