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/*
* lib/netfilter/queue_msg.c Netfilter Queue Messages
*
* 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) 2007, 2008 Patrick McHardy <kaber@trash.net>
*/
/**
* @ingroup nfnl
* @defgroup queue Queue
* @brief
* @{
*/
#include <sys/types.h>
#include <linux/netfilter/nfnetlink_queue.h>
#include <netlink-local.h>
#include <netlink/attr.h>
#include <netlink/netfilter/nfnl.h>
#include <netlink/netfilter/queue_msg.h>
static struct nl_cache_ops nfnl_queue_msg_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 queue_policy[NFQA_MAX+1] = {
[NFQA_PACKET_HDR] = {
.minlen = sizeof(struct nfqnl_msg_packet_hdr),
},
[NFQA_VERDICT_HDR] = {
.minlen = sizeof(struct nfqnl_msg_verdict_hdr),
},
[NFQA_MARK] = { .type = NLA_U32 },
[NFQA_TIMESTAMP] = {
.minlen = sizeof(struct nfqnl_msg_packet_timestamp),
},
[NFQA_IFINDEX_INDEV] = { .type = NLA_U32 },
[NFQA_IFINDEX_OUTDEV] = { .type = NLA_U32 },
[NFQA_IFINDEX_PHYSINDEV] = { .type = NLA_U32 },
[NFQA_IFINDEX_PHYSOUTDEV] = { .type = NLA_U32 },
[NFQA_HWADDR] = {
.minlen = sizeof(struct nfqnl_msg_packet_hw),
},
};
int nfnlmsg_queue_msg_parse(struct nlmsghdr *nlh,
struct nfnl_queue_msg **result)
{
struct nfnl_queue_msg *msg;
struct nlattr *tb[NFQA_MAX+1];
struct nlattr *attr;
int err;
msg = nfnl_queue_msg_alloc();
if (!msg)
return -NLE_NOMEM;
msg->ce_msgtype = nlh->nlmsg_type;
err = nlmsg_parse(nlh, sizeof(struct nfgenmsg), tb, NFQA_MAX,
queue_policy);
if (err < 0)
goto errout;
nfnl_queue_msg_set_group(msg, nfnlmsg_res_id(nlh));
nfnl_queue_msg_set_family(msg, nfnlmsg_family(nlh));
attr = tb[NFQA_PACKET_HDR];
if (attr) {
struct nfqnl_msg_packet_hdr *hdr = nla_data(attr);
nfnl_queue_msg_set_packetid(msg, ntohl(hdr->packet_id));
if (hdr->hw_protocol)
nfnl_queue_msg_set_hwproto(msg, hdr->hw_protocol);
nfnl_queue_msg_set_hook(msg, hdr->hook);
}
attr = tb[NFQA_MARK];
if (attr)
nfnl_queue_msg_set_mark(msg, ntohl(nla_get_u32(attr)));
attr = tb[NFQA_TIMESTAMP];
if (attr) {
struct nfqnl_msg_packet_timestamp *timestamp = nla_data(attr);
struct timeval tv;
tv.tv_sec = ntohll(timestamp->sec);
tv.tv_usec = ntohll(timestamp->usec);
nfnl_queue_msg_set_timestamp(msg, &tv);
}
attr = tb[NFQA_IFINDEX_INDEV];
if (attr)
nfnl_queue_msg_set_indev(msg, ntohl(nla_get_u32(attr)));
attr = tb[NFQA_IFINDEX_OUTDEV];
if (attr)
nfnl_queue_msg_set_outdev(msg, ntohl(nla_get_u32(attr)));
attr = tb[NFQA_IFINDEX_PHYSINDEV];
if (attr)
nfnl_queue_msg_set_physindev(msg, ntohl(nla_get_u32(attr)));
attr = tb[NFQA_IFINDEX_PHYSOUTDEV];
if (attr)
nfnl_queue_msg_set_physoutdev(msg, ntohl(nla_get_u32(attr)));
attr = tb[NFQA_HWADDR];
if (attr) {
struct nfqnl_msg_packet_hw *hw = nla_data(attr);
nfnl_queue_msg_set_hwaddr(msg, hw->hw_addr,
ntohs(hw->hw_addrlen));
}
attr = tb[NFQA_PAYLOAD];
if (attr) {
err = nfnl_queue_msg_set_payload(msg, nla_data(attr),
nla_len(attr));
if (err < 0)
goto errout;
}
*result = msg;
return 0;
errout:
nfnl_queue_msg_put(msg);
return err;
}
static int queue_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
struct nlmsghdr *nlh, struct nl_parser_param *pp)
{
struct nfnl_queue_msg *msg;
int err;
if ((err = nfnlmsg_queue_msg_parse(nlh, &msg)) < 0)
goto errout;
err = pp->pp_cb((struct nl_object *) msg, pp);
errout:
nfnl_queue_msg_put(msg);
return err;
}
/** @} */
struct nl_msg *nfnl_queue_msg_build_verdict(const struct nfnl_queue_msg *msg)
{
struct nl_msg *nlmsg;
struct nfqnl_msg_verdict_hdr verdict;
nlmsg = nfnlmsg_alloc_simple(NFNL_SUBSYS_QUEUE, NFQNL_MSG_VERDICT, 0,
nfnl_queue_msg_get_family(msg),
nfnl_queue_msg_get_group(msg));
if (nlmsg == NULL)
return NULL;
verdict.id = htonl(nfnl_queue_msg_get_packetid(msg));
verdict.verdict = htonl(nfnl_queue_msg_get_verdict(msg));
if (nla_put(nlmsg, NFQA_VERDICT_HDR, sizeof(verdict), &verdict) < 0)
goto nla_put_failure;
if (nfnl_queue_msg_test_mark(msg) &&
nla_put_u32(nlmsg, NFQA_MARK,
ntohl(nfnl_queue_msg_get_mark(msg))) < 0)
goto nla_put_failure;
return nlmsg;
nla_put_failure:
nlmsg_free(nlmsg);
return NULL;
}
int nfnl_queue_msg_send_verdict(struct nl_sock *nlh,
const struct nfnl_queue_msg *msg)
{
struct nl_msg *nlmsg;
int err;
nlmsg = nfnl_queue_msg_build_verdict(msg);
if (nlmsg == NULL)
return -NLE_NOMEM;
err = nl_send_auto_complete(nlh, nlmsg);
nlmsg_free(nlmsg);
if (err < 0)
return err;
return wait_for_ack(nlh);
}
#define NFNLMSG_QUEUE_TYPE(type) NFNLMSG_TYPE(NFNL_SUBSYS_QUEUE, (type))
static struct nl_cache_ops nfnl_queue_msg_ops = {
.co_name = "netfilter/queue_msg",
.co_hdrsize = NFNL_HDRLEN,
.co_msgtypes = {
{ NFNLMSG_QUEUE_TYPE(NFQNL_MSG_PACKET), NL_ACT_NEW, "new" },
END_OF_MSGTYPES_LIST,
},
.co_protocol = NETLINK_NETFILTER,
.co_msg_parser = queue_msg_parser,
.co_obj_ops = &queue_msg_obj_ops,
};
static void __init nfnl_msg_queue_init(void)
{
nl_cache_mngt_register(&nfnl_queue_msg_ops);
}
static void __exit nfnl_queue_msg_exit(void)
{
nl_cache_mngt_unregister(&nfnl_queue_msg_ops);
}
/** @} */
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