3f48e49102
The NUFLA_GID attribute (currently only in net-2.6.25) contains the gid of the sending process for locally generated packets. Signed-off-by: Patrick McHardy <kaber@trash.net>
356 lines
7.4 KiB
C
356 lines
7.4 KiB
C
/*
|
|
* lib/netfilter/log.c Netfilter Log
|
|
*
|
|
* 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) 2003-2006 Thomas Graf <tgraf@suug.ch>
|
|
* Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
|
|
* Copyright (c) 2007 Secure Computing Corporation
|
|
*/
|
|
|
|
/**
|
|
* @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.h>
|
|
|
|
static struct nl_cache_ops nfnl_log_ops;
|
|
|
|
#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_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 },
|
|
};
|
|
|
|
struct nfnl_log *nfnlmsg_log_parse(struct nlmsghdr *nlh)
|
|
{
|
|
struct nfnl_log *log;
|
|
struct nlattr *tb[NFULA_MAX+1];
|
|
struct nlattr *attr;
|
|
int err;
|
|
|
|
log = nfnl_log_alloc();
|
|
if (!log)
|
|
return NULL;
|
|
|
|
log->ce_msgtype = nlh->nlmsg_type;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(struct nfgenmsg), tb, NFULA_MAX,
|
|
log_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
nfnl_log_set_family(log, 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_set_hwproto(log, hdr->hw_protocol);
|
|
nfnl_log_set_hook(log, hdr->hook);
|
|
}
|
|
|
|
attr = tb[NFULA_MARK];
|
|
if (attr)
|
|
nfnl_log_set_mark(log, 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_set_timestamp(log, &tv);
|
|
}
|
|
|
|
attr = tb[NFULA_IFINDEX_INDEV];
|
|
if (attr)
|
|
nfnl_log_set_indev(log, ntohl(nla_get_u32(attr)));
|
|
|
|
attr = tb[NFULA_IFINDEX_OUTDEV];
|
|
if (attr)
|
|
nfnl_log_set_outdev(log, ntohl(nla_get_u32(attr)));
|
|
|
|
attr = tb[NFULA_IFINDEX_PHYSINDEV];
|
|
if (attr)
|
|
nfnl_log_set_physindev(log, ntohl(nla_get_u32(attr)));
|
|
|
|
attr = tb[NFULA_IFINDEX_PHYSOUTDEV];
|
|
if (attr)
|
|
nfnl_log_set_physoutdev(log, ntohl(nla_get_u32(attr)));
|
|
|
|
attr = tb[NFULA_HWADDR];
|
|
if (attr) {
|
|
struct nfulnl_msg_packet_hw *hw = nla_data(attr);
|
|
|
|
nfnl_log_set_hwaddr(log, hw->hw_addr, ntohs(hw->hw_addrlen));
|
|
}
|
|
|
|
attr = tb[NFULA_PAYLOAD];
|
|
if (attr) {
|
|
err = nfnl_log_set_payload(log, nla_data(attr), nla_len(attr));
|
|
if (err < 0)
|
|
goto errout;
|
|
}
|
|
|
|
attr = tb[NFULA_PREFIX];
|
|
if (attr) {
|
|
err = nfnl_log_set_prefix(log, nla_data(attr));
|
|
if (err < 0)
|
|
goto errout;
|
|
}
|
|
|
|
attr = tb[NFULA_UID];
|
|
if (attr)
|
|
nfnl_log_set_uid(log, ntohl(nla_get_u32(attr)));
|
|
|
|
attr = tb[NFULA_GID];
|
|
if (attr)
|
|
nfnl_log_set_gid(log, ntohl(nla_get_u32(attr)));
|
|
|
|
attr = tb[NFULA_SEQ];
|
|
if (attr)
|
|
nfnl_log_set_seq(log, ntohl(nla_get_u32(attr)));
|
|
|
|
attr = tb[NFULA_SEQ_GLOBAL];
|
|
if (attr)
|
|
nfnl_log_set_seq_global(log, ntohl(nla_get_u32(attr)));
|
|
|
|
return log;
|
|
|
|
errout:
|
|
nfnl_log_put(log);
|
|
return NULL;
|
|
}
|
|
|
|
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 *log;
|
|
int err;
|
|
|
|
log = nfnlmsg_log_parse(nlh);
|
|
if (log == NULL)
|
|
goto errout_errno;
|
|
|
|
err = pp->pp_cb((struct nl_object *) log, pp);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = P_ACCEPT;
|
|
|
|
errout:
|
|
nfnl_log_put(log);
|
|
return err;
|
|
|
|
errout_errno:
|
|
err = nl_get_errno();
|
|
goto errout;
|
|
}
|
|
|
|
/**
|
|
* @name Log Commands
|
|
* @{
|
|
*/
|
|
|
|
static struct nl_msg *build_log_cmd_msg(uint8_t family, uint16_t queuenum,
|
|
uint8_t command)
|
|
{
|
|
struct nl_msg *msg;
|
|
struct nfulnl_msg_config_cmd cmd;
|
|
|
|
msg = nfnlmsg_alloc_simple(NFNL_SUBSYS_ULOG, NFULNL_MSG_CONFIG, 0,
|
|
family, queuenum);
|
|
if (msg == NULL)
|
|
return NULL;
|
|
|
|
cmd.command = command;
|
|
if (nla_put(msg, NFULA_CFG_CMD, sizeof(cmd), &cmd) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return msg;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
static int send_log_msg(struct nl_handle *handle, struct nl_msg *msg)
|
|
{
|
|
int err;
|
|
|
|
err = nl_send_auto_complete(handle, msg);
|
|
nlmsg_free(msg);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return nl_wait_for_ack(handle);
|
|
}
|
|
|
|
struct nl_msg *nfnl_log_build_bind(uint16_t queuenum)
|
|
{
|
|
return build_log_cmd_msg(0, queuenum, NFULNL_CFG_CMD_BIND);
|
|
}
|
|
|
|
int nfnl_log_bind(struct nl_handle *nlh, uint16_t queuenum)
|
|
{
|
|
struct nl_msg *msg;
|
|
|
|
msg = nfnl_log_build_bind(queuenum);
|
|
if (!msg)
|
|
return nl_get_errno();
|
|
|
|
return send_log_msg(nlh, msg);
|
|
}
|
|
|
|
struct nl_msg *nfnl_log_build_unbind(uint16_t queuenum)
|
|
{
|
|
return build_log_cmd_msg(0, queuenum, NFULNL_CFG_CMD_UNBIND);
|
|
}
|
|
|
|
int nfnl_log_unbind(struct nl_handle *nlh, uint16_t queuenum)
|
|
{
|
|
struct nl_msg *msg;
|
|
|
|
msg = nfnl_log_build_bind(queuenum);
|
|
if (!msg)
|
|
return nl_get_errno();
|
|
|
|
return send_log_msg(nlh, msg);
|
|
}
|
|
|
|
struct nl_msg *nfnl_log_build_pf_bind(uint8_t pf)
|
|
{
|
|
return build_log_cmd_msg(pf, 0, NFULNL_CFG_CMD_PF_BIND);
|
|
}
|
|
|
|
int nfnl_log_pf_bind(struct nl_handle *nlh, uint8_t pf)
|
|
{
|
|
struct nl_msg *msg;
|
|
|
|
msg = nfnl_log_build_pf_bind(pf);
|
|
if (!msg)
|
|
return nl_get_errno();
|
|
|
|
return send_log_msg(nlh, msg);
|
|
}
|
|
|
|
struct nl_msg *nfnl_log_build_pf_unbind(uint8_t pf)
|
|
{
|
|
return build_log_cmd_msg(pf, 0, NFULNL_CFG_CMD_PF_UNBIND);
|
|
}
|
|
|
|
int nfnl_log_pf_unbind(struct nl_handle *nlh, uint8_t pf)
|
|
{
|
|
struct nl_msg *msg;
|
|
|
|
msg = nfnl_log_build_pf_unbind(pf);
|
|
if (!msg)
|
|
return nl_get_errno();
|
|
|
|
return send_log_msg(nlh, msg);
|
|
}
|
|
|
|
struct nl_msg *nfnl_log_build_mode(uint16_t queuenum, uint8_t copy_mode,
|
|
uint32_t copy_range)
|
|
{
|
|
struct nl_msg *msg;
|
|
struct nfulnl_msg_config_mode mode;
|
|
|
|
msg = nfnlmsg_alloc_simple(NFNL_SUBSYS_ULOG, NFULNL_MSG_CONFIG, 0,
|
|
0, queuenum);
|
|
if (msg == NULL)
|
|
return NULL;
|
|
|
|
mode.copy_mode = copy_mode;
|
|
mode.copy_range = htonl(copy_range);
|
|
if (nla_put(msg, NFULA_CFG_MODE, sizeof(mode), &mode) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return msg;
|
|
|
|
nla_put_failure:
|
|
nlmsg_free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
int nfnl_log_set_mode(struct nl_handle *nlh, uint16_t queuenum,
|
|
uint8_t copy_mode, uint32_t copy_range)
|
|
{
|
|
struct nl_msg *msg;
|
|
|
|
msg = nfnl_log_build_mode(queuenum, copy_mode, copy_range);
|
|
if (!msg)
|
|
return nl_get_errno();
|
|
return send_log_msg(nlh, msg);
|
|
}
|
|
|
|
/** @} */
|
|
|
|
#define NFNLMSG_LOG_TYPE(type) NFNLMSG_TYPE(NFNL_SUBSYS_ULOG, (type))
|
|
static struct nl_cache_ops nfnl_log_ops = {
|
|
.co_name = "netfilter/log",
|
|
.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_obj_ops,
|
|
};
|
|
|
|
static void __init log_init(void)
|
|
{
|
|
nl_cache_mngt_register(&nfnl_log_ops);
|
|
}
|
|
|
|
static void __exit log_exit(void)
|
|
{
|
|
nl_cache_mngt_unregister(&nfnl_log_ops);
|
|
}
|
|
|
|
/** @} */
|