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1 office 1 /*
2 * lib/netfilter/log_msg.c Netfilter Log Message
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
7 * of the License.
8 *
9 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
10 * Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
11 * Copyright (c) 2007 Secure Computing Corporation
12 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
13 */
14  
15 /**
16 * @ingroup nfnl
17 * @defgroup log Log
18 * @brief
19 * @{
20 */
21  
22 #include <sys/types.h>
23 #include <linux/netfilter/nfnetlink_log.h>
24  
25 #include <netlink-local.h>
26 #include <netlink/attr.h>
27 #include <netlink/netfilter/nfnl.h>
28 #include <netlink/netfilter/log_msg.h>
29  
30 #if __BYTE_ORDER == __BIG_ENDIAN
31 static uint64_t ntohll(uint64_t x)
32 {
33 return x;
34 }
35 #elif __BYTE_ORDER == __LITTLE_ENDIAN
36 static uint64_t ntohll(uint64_t x)
37 {
38 return __bswap_64(x);
39 }
40 #endif
41  
42 static struct nla_policy log_msg_policy[NFULA_MAX+1] = {
43 [NFULA_PACKET_HDR] = {
44 .minlen = sizeof(struct nfulnl_msg_packet_hdr)
45 },
46 [NFULA_MARK] = { .type = NLA_U32 },
47 [NFULA_TIMESTAMP] = {
48 .minlen = sizeof(struct nfulnl_msg_packet_timestamp)
49 },
50 [NFULA_IFINDEX_INDEV] = { .type = NLA_U32 },
51 [NFULA_IFINDEX_OUTDEV] = { .type = NLA_U32 },
52 [NFULA_IFINDEX_PHYSINDEV] = { .type = NLA_U32 },
53 [NFULA_IFINDEX_PHYSOUTDEV] = { .type = NLA_U32 },
54 [NFULA_HWADDR] = {
55 .minlen = sizeof(struct nfulnl_msg_packet_hw)
56 },
57 //[NFULA_PAYLOAD]
58 [NFULA_PREFIX] = { .type = NLA_STRING, },
59 [NFULA_UID] = { .type = NLA_U32 },
60 [NFULA_GID] = { .type = NLA_U32 },
61 [NFULA_SEQ] = { .type = NLA_U32 },
62 [NFULA_SEQ_GLOBAL] = { .type = NLA_U32 },
63 };
64  
65 int nfnlmsg_log_msg_parse(struct nlmsghdr *nlh, struct nfnl_log_msg **result)
66 {
67 struct nfnl_log_msg *msg;
68 struct nlattr *tb[NFULA_MAX+1];
69 struct nlattr *attr;
70 int err;
71  
72 msg = nfnl_log_msg_alloc();
73 if (!msg)
74 return -NLE_NOMEM;
75  
76 msg->ce_msgtype = nlh->nlmsg_type;
77  
78 err = nlmsg_parse(nlh, sizeof(struct nfgenmsg), tb, NFULA_MAX,
79 log_msg_policy);
80 if (err < 0)
81 goto errout;
82  
83 nfnl_log_msg_set_family(msg, nfnlmsg_family(nlh));
84  
85 attr = tb[NFULA_PACKET_HDR];
86 if (attr) {
87 struct nfulnl_msg_packet_hdr *hdr = nla_data(attr);
88  
89 if (hdr->hw_protocol)
90 nfnl_log_msg_set_hwproto(msg, hdr->hw_protocol);
91 nfnl_log_msg_set_hook(msg, hdr->hook);
92 }
93  
94 attr = tb[NFULA_MARK];
95 if (attr)
96 nfnl_log_msg_set_mark(msg, ntohl(nla_get_u32(attr)));
97  
98 attr = tb[NFULA_TIMESTAMP];
99 if (attr) {
100 struct nfulnl_msg_packet_timestamp *timestamp = nla_data(attr);
101 struct timeval tv;
102  
103 tv.tv_sec = ntohll(timestamp->sec);
104 tv.tv_usec = ntohll(timestamp->usec);
105 nfnl_log_msg_set_timestamp(msg, &tv);
106 }
107  
108 attr = tb[NFULA_IFINDEX_INDEV];
109 if (attr)
110 nfnl_log_msg_set_indev(msg, ntohl(nla_get_u32(attr)));
111  
112 attr = tb[NFULA_IFINDEX_OUTDEV];
113 if (attr)
114 nfnl_log_msg_set_outdev(msg, ntohl(nla_get_u32(attr)));
115  
116 attr = tb[NFULA_IFINDEX_PHYSINDEV];
117 if (attr)
118 nfnl_log_msg_set_physindev(msg, ntohl(nla_get_u32(attr)));
119  
120 attr = tb[NFULA_IFINDEX_PHYSOUTDEV];
121 if (attr)
122 nfnl_log_msg_set_physoutdev(msg, ntohl(nla_get_u32(attr)));
123  
124 attr = tb[NFULA_HWADDR];
125 if (attr) {
126 struct nfulnl_msg_packet_hw *hw = nla_data(attr);
127  
128 nfnl_log_msg_set_hwaddr(msg, hw->hw_addr, ntohs(hw->hw_addrlen));
129 }
130  
131 attr = tb[NFULA_PAYLOAD];
132 if (attr) {
133 err = nfnl_log_msg_set_payload(msg, nla_data(attr), nla_len(attr));
134 if (err < 0)
135 goto errout;
136 }
137  
138 attr = tb[NFULA_PREFIX];
139 if (attr) {
140 err = nfnl_log_msg_set_prefix(msg, nla_data(attr));
141 if (err < 0)
142 goto errout;
143 }
144  
145 attr = tb[NFULA_UID];
146 if (attr)
147 nfnl_log_msg_set_uid(msg, ntohl(nla_get_u32(attr)));
148  
149 attr = tb[NFULA_GID];
150 if (attr)
151 nfnl_log_msg_set_gid(msg, ntohl(nla_get_u32(attr)));
152  
153 attr = tb[NFULA_SEQ];
154 if (attr)
155 nfnl_log_msg_set_seq(msg, ntohl(nla_get_u32(attr)));
156  
157 attr = tb[NFULA_SEQ_GLOBAL];
158 if (attr)
159 nfnl_log_msg_set_seq_global(msg, ntohl(nla_get_u32(attr)));
160  
161 *result = msg;
162 return 0;
163  
164 errout:
165 nfnl_log_msg_put(msg);
166 return err;
167 }
168  
169 static int log_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
170 struct nlmsghdr *nlh, struct nl_parser_param *pp)
171 {
172 struct nfnl_log_msg *msg;
173 int err;
174  
175 if ((err = nfnlmsg_log_msg_parse(nlh, &msg)) < 0)
176 goto errout;
177  
178 err = pp->pp_cb((struct nl_object *) msg, pp);
179 errout:
180 nfnl_log_msg_put(msg);
181 return err;
182 }
183  
184 /** @} */
185  
186 #define NFNLMSG_LOG_TYPE(type) NFNLMSG_TYPE(NFNL_SUBSYS_ULOG, (type))
187 static struct nl_cache_ops nfnl_log_msg_ops = {
188 .co_name = "netfilter/log_msg",
189 .co_hdrsize = NFNL_HDRLEN,
190 .co_msgtypes = {
191 { NFNLMSG_LOG_TYPE(NFULNL_MSG_PACKET), NL_ACT_NEW, "new" },
192 END_OF_MSGTYPES_LIST,
193 },
194 .co_protocol = NETLINK_NETFILTER,
195 .co_msg_parser = log_msg_parser,
196 .co_obj_ops = &log_msg_obj_ops,
197 };
198  
199 static void __init log_msg_init(void)
200 {
201 nl_cache_mngt_register(&nfnl_log_msg_ops);
202 }
203  
204 static void __exit log_msg_exit(void)
205 {
206 nl_cache_mngt_unregister(&nfnl_log_msg_ops);
207 }
208  
209 /** @} */