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/*
* 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-private/netlink.h>
#include <netlink/attr.h>
#include <netlink/netfilter/nfnl.h>
#include <netlink/netfilter/log_msg.h>
#include <byteswap.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)
return err;
err = pp->pp_cb((struct nl_object *) msg, pp);
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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