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/* SPDX-License-Identifier: LGPL-2.1-only */
/*
* Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
* Copyright (c) 2010 Karl Hiramoto <karl@hiramoto.org>
*/
/**
* @ingroup nfnl
* @defgroup queue Queue
* @brief
* @{
*/
#include "nl-default.h"
#include <sys/types.h>
#include <linux/netfilter/nfnetlink_queue.h>
#include <netlink/attr.h>
#include <netlink/netfilter/nfnl.h>
#include <netlink/netfilter/queue_msg.h>
#include "nl-netfilter.h"
#include "nl-priv-dynamic-core/nl-core.h"
#include "nl-priv-dynamic-core/cache-api.h"
static struct nl_cache_ops nfnl_queue_msg_ops;
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)
return err;
err = pp->pp_cb((struct nl_object *) msg, pp);
nfnl_queue_msg_put(msg);
return err;
}
/** @} */
static struct nl_msg *
__nfnl_queue_msg_build_verdict(const struct nfnl_queue_msg *msg,
uint8_t type)
{
struct nl_msg *nlmsg;
struct nfqnl_msg_verdict_hdr verdict;
nlmsg = nfnlmsg_alloc_simple(NFNL_SUBSYS_QUEUE, type, 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;
}
struct nl_msg *
nfnl_queue_msg_build_verdict(const struct nfnl_queue_msg *msg)
{
return __nfnl_queue_msg_build_verdict(msg, NFQNL_MSG_VERDICT);
}
struct nl_msg *
nfnl_queue_msg_build_verdict_batch(const struct nfnl_queue_msg *msg)
{
return __nfnl_queue_msg_build_verdict(msg, NFQNL_MSG_VERDICT_BATCH);
}
/**
* Send a message verdict/mark
* @arg nlh netlink messsage header
* @arg msg queue msg
* @return 0 on OK or error code
*/
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);
}
/**
* Send a message batched verdict/mark
* @arg nlh netlink messsage header
* @arg msg queue msg
* @return 0 on OK or error code
*/
int nfnl_queue_msg_send_verdict_batch(struct nl_sock *nlh,
const struct nfnl_queue_msg *msg)
{
struct nl_msg *nlmsg;
int err;
nlmsg = nfnl_queue_msg_build_verdict_batch(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);
}
/**
* Send a message verdict including the payload
* @arg nlh netlink messsage header
* @arg msg queue msg
* @arg payload_data packet payload data
* @arg payload_len payload length
* @return 0 on OK or error code
*/
int nfnl_queue_msg_send_verdict_payload(struct nl_sock *nlh,
const struct nfnl_queue_msg *msg,
const void *payload_data, unsigned payload_len)
{
struct nl_msg *nlmsg;
int err;
struct iovec iov[3];
struct nlattr nla;
nlmsg = nfnl_queue_msg_build_verdict(msg);
if (nlmsg == NULL)
return -NLE_NOMEM;
memset(iov, 0, sizeof(iov));
iov[0].iov_base = (void *) nlmsg_hdr(nlmsg);
iov[0].iov_len = nlmsg_hdr(nlmsg)->nlmsg_len;
nla.nla_type = NFQA_PAYLOAD;
nla.nla_len = payload_len + sizeof(nla);
nlmsg_hdr(nlmsg)->nlmsg_len += nla.nla_len;
iov[1].iov_base = (void *) &nla;
iov[1].iov_len = sizeof(nla);
iov[2].iov_base = (void *) payload_data;
iov[2].iov_len = NLA_ALIGN(payload_len);
nl_complete_msg(nlh, nlmsg);
err = nl_send_iovec(nlh, nlmsg, iov, 3);
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 _nl_init nfnl_msg_queue_init(void)
{
nl_cache_mngt_register(&nfnl_queue_msg_ops);
}
static void _nl_exit nfnl_queue_msg_exit(void)
{
nl_cache_mngt_unregister(&nfnl_queue_msg_ops);
}
/** @} */
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