3040a1d625
This interface was internal so far which required all code defining caches to be compiled with the sources available. In order to simplify the interface, the co_msg_parser prototype was changed to take the struct nl_parser_param directly instead of a void *. It used to be void * because the co_msg_parser was directly passed as the NL_CB_VALID callback function.
348 lines
7.2 KiB
C
348 lines
7.2 KiB
C
/*
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* lib/netfilter/log.c Netfilter Log
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
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* Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
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* Copyright (c) 2007 Secure Computing Corporation
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*/
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/**
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* @ingroup nfnl
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* @defgroup log Log
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* @brief
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* @{
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*/
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#include <sys/types.h>
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#include <linux/netfilter/nfnetlink_log.h>
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#include <netlink-local.h>
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#include <netlink/attr.h>
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#include <netlink/netfilter/nfnl.h>
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#include <netlink/netfilter/log.h>
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static struct nl_cache_ops nfnl_log_ops;
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#if __BYTE_ORDER == __BIG_ENDIAN
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static uint64_t ntohll(uint64_t x)
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{
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return x;
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}
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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static uint64_t ntohll(uint64_t x)
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{
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return __bswap_64(x);
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}
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#endif
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static struct nla_policy log_policy[NFULA_MAX+1] = {
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[NFULA_PACKET_HDR] = {
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.minlen = sizeof(struct nfulnl_msg_packet_hdr)
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},
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[NFULA_MARK] = { .type = NLA_U32 },
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[NFULA_TIMESTAMP] = {
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.minlen = sizeof(struct nfulnl_msg_packet_timestamp)
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},
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[NFULA_IFINDEX_INDEV] = { .type = NLA_U32 },
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[NFULA_IFINDEX_OUTDEV] = { .type = NLA_U32 },
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[NFULA_IFINDEX_PHYSINDEV] = { .type = NLA_U32 },
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[NFULA_IFINDEX_PHYSOUTDEV] = { .type = NLA_U32 },
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[NFULA_HWADDR] = {
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.minlen = sizeof(struct nfulnl_msg_packet_hw)
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},
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//[NFULA_PAYLOAD]
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[NFULA_PREFIX] = { .type = NLA_STRING, },
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[NFULA_UID] = { .type = NLA_U32 },
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[NFULA_SEQ] = { .type = NLA_U32 },
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[NFULA_SEQ_GLOBAL] = { .type = NLA_U32 },
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};
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struct nfnl_log *nfnlmsg_log_parse(struct nlmsghdr *nlh)
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{
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struct nfnl_log *log;
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struct nlattr *tb[NFULA_MAX+1];
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struct nlattr *attr;
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int err;
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log = nfnl_log_alloc();
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if (!log)
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return NULL;
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log->ce_msgtype = nlh->nlmsg_type;
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err = nlmsg_parse(nlh, sizeof(struct nfgenmsg), tb, NFULA_MAX,
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log_policy);
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if (err < 0)
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goto errout;
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nfnl_log_set_family(log, nfnlmsg_family(nlh));
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attr = tb[NFULA_PACKET_HDR];
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if (attr) {
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struct nfulnl_msg_packet_hdr *hdr = nla_data(attr);
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nfnl_log_set_hwproto(log, hdr->hw_protocol);
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nfnl_log_set_hook(log, hdr->hook);
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}
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attr = tb[NFULA_MARK];
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if (attr)
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nfnl_log_set_mark(log, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_TIMESTAMP];
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if (attr) {
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struct nfulnl_msg_packet_timestamp *timestamp = nla_data(attr);
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struct timeval tv;
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tv.tv_sec = ntohll(timestamp->sec);
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tv.tv_usec = ntohll(timestamp->usec);
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nfnl_log_set_timestamp(log, &tv);
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}
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attr = tb[NFULA_IFINDEX_INDEV];
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if (attr)
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nfnl_log_set_indev(log, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_IFINDEX_OUTDEV];
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if (attr)
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nfnl_log_set_outdev(log, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_IFINDEX_PHYSINDEV];
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if (attr)
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nfnl_log_set_physindev(log, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_IFINDEX_PHYSOUTDEV];
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if (attr)
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nfnl_log_set_physoutdev(log, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_HWADDR];
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if (attr) {
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struct nfulnl_msg_packet_hw *hw = nla_data(attr);
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nfnl_log_set_hwaddr(log, hw->hw_addr, ntohs(hw->hw_addrlen));
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}
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attr = tb[NFULA_PAYLOAD];
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if (attr) {
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err = nfnl_log_set_payload(log, nla_data(attr), nla_len(attr));
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if (err < 0)
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goto errout;
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}
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attr = tb[NFULA_PREFIX];
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if (attr) {
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err = nfnl_log_set_prefix(log, nla_data(attr));
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if (err < 0)
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goto errout;
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}
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attr = tb[NFULA_UID];
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if (attr)
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nfnl_log_set_uid(log, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_SEQ];
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if (attr)
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nfnl_log_set_seq(log, ntohl(nla_get_u32(attr)));
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attr = tb[NFULA_SEQ_GLOBAL];
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if (attr)
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nfnl_log_set_seq_global(log, ntohl(nla_get_u32(attr)));
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return log;
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errout:
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nfnl_log_put(log);
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return NULL;
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}
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static int log_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
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struct nlmsghdr *nlh, struct nl_parser_param *pp)
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{
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struct nfnl_log *log;
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int err;
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log = nfnlmsg_log_parse(nlh);
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if (log == NULL)
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goto errout_errno;
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err = pp->pp_cb((struct nl_object *) log, pp);
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if (err < 0)
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goto errout;
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return P_ACCEPT;
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errout_errno:
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err = nl_get_errno();
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errout:
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nfnl_log_put(log);
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return err;
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}
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/**
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* @name Log Commands
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* @{
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*/
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static struct nl_msg *build_log_cmd_msg(uint8_t family, uint16_t queuenum,
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uint8_t command)
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{
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struct nl_msg *msg;
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struct nfulnl_msg_config_cmd cmd;
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msg = nfnlmsg_alloc_simple(NFNL_SUBSYS_ULOG, NFULNL_MSG_CONFIG, 0,
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family, queuenum);
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if (msg == NULL)
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return NULL;
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cmd.command = command;
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if (nla_put(msg, NFULA_CFG_CMD, sizeof(cmd), &cmd) < 0)
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goto nla_put_failure;
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return msg;
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nla_put_failure:
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nlmsg_free(msg);
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return NULL;
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}
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static int send_log_msg(struct nl_handle *handle, struct nl_msg *msg)
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{
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int err;
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err = nl_send_auto_complete(handle, msg);
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nlmsg_free(msg);
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if (err < 0)
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return err;
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return nl_wait_for_ack(handle);
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}
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struct nl_msg *nfnl_log_build_bind(uint16_t queuenum)
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{
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return build_log_cmd_msg(0, queuenum, NFULNL_CFG_CMD_BIND);
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}
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int nfnl_log_bind(struct nl_handle *nlh, uint16_t queuenum)
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{
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struct nl_msg *msg;
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msg = nfnl_log_build_bind(queuenum);
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if (!msg)
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return nl_get_errno();
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return send_log_msg(nlh, msg);
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}
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struct nl_msg *nfnl_log_build_unbind(uint16_t queuenum)
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{
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return build_log_cmd_msg(0, queuenum, NFULNL_CFG_CMD_UNBIND);
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}
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int nfnl_log_unbind(struct nl_handle *nlh, uint16_t queuenum)
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{
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struct nl_msg *msg;
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msg = nfnl_log_build_bind(queuenum);
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if (!msg)
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return nl_get_errno();
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return send_log_msg(nlh, msg);
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}
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struct nl_msg *nfnl_log_build_pf_bind(uint8_t pf)
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{
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return build_log_cmd_msg(pf, 0, NFULNL_CFG_CMD_PF_BIND);
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}
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int nfnl_log_pf_bind(struct nl_handle *nlh, uint8_t pf)
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{
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struct nl_msg *msg;
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msg = nfnl_log_build_pf_bind(pf);
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if (!msg)
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return nl_get_errno();
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return send_log_msg(nlh, msg);
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}
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struct nl_msg *nfnl_log_build_pf_unbind(uint8_t pf)
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{
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return build_log_cmd_msg(pf, 0, NFULNL_CFG_CMD_PF_UNBIND);
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}
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int nfnl_log_pf_unbind(struct nl_handle *nlh, uint8_t pf)
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{
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struct nl_msg *msg;
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msg = nfnl_log_build_pf_unbind(pf);
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if (!msg)
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return nl_get_errno();
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return send_log_msg(nlh, msg);
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}
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struct nl_msg *nfnl_log_build_mode(uint16_t queuenum, uint8_t copy_mode,
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uint32_t copy_range)
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{
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struct nl_msg *msg;
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struct nfulnl_msg_config_mode mode;
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msg = nfnlmsg_alloc_simple(NFNL_SUBSYS_ULOG, NFULNL_MSG_CONFIG, 0,
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0, queuenum);
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if (msg == NULL)
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return NULL;
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mode.copy_mode = copy_mode;
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mode.copy_range = htonl(copy_range);
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if (nla_put(msg, NFULA_CFG_MODE, sizeof(mode), &mode) < 0)
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goto nla_put_failure;
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return msg;
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nla_put_failure:
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nlmsg_free(msg);
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return NULL;
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}
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int nfnl_log_set_mode(struct nl_handle *nlh, uint16_t queuenum,
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uint8_t copy_mode, uint32_t copy_range)
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{
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struct nl_msg *msg;
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msg = nfnl_log_build_mode(queuenum, copy_mode, copy_range);
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if (!msg)
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return nl_get_errno();
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return send_log_msg(nlh, msg);
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}
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/** @} */
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#define NFNLMSG_LOG_TYPE(type) NFNLMSG_TYPE(NFNL_SUBSYS_ULOG, (type))
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static struct nl_cache_ops nfnl_log_ops = {
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.co_name = "netfilter/log",
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.co_hdrsize = NFNL_HDRLEN,
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.co_msgtypes = {
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{ NFNLMSG_LOG_TYPE(NFULNL_MSG_PACKET), NL_ACT_NEW, "new" },
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END_OF_MSGTYPES_LIST,
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},
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.co_protocol = NETLINK_NETFILTER,
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.co_msg_parser = log_msg_parser,
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.co_obj_ops = &log_obj_ops,
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};
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static void __init log_init(void)
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{
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nl_cache_mngt_register(&nfnl_log_ops);
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}
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static void __exit log_exit(void)
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{
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nl_cache_mngt_unregister(&nfnl_log_ops);
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}
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/** @} */
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