libnl  3.2.24-rc1
log_msg.c
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-private/netlink.h>
26 #include <netlink/attr.h>
27 #include <netlink/netfilter/nfnl.h>
28 #include <netlink/netfilter/log_msg.h>
29 #include <byteswap.h>
30 
31 #if __BYTE_ORDER == __BIG_ENDIAN
32 static uint64_t ntohll(uint64_t x)
33 {
34  return x;
35 }
36 #elif __BYTE_ORDER == __LITTLE_ENDIAN
37 static uint64_t ntohll(uint64_t x)
38 {
39  return bswap_64(x);
40 }
41 #endif
42 
43 static struct nla_policy log_msg_policy[NFULA_MAX+1] = {
44  [NFULA_PACKET_HDR] = {
45  .minlen = sizeof(struct nfulnl_msg_packet_hdr)
46  },
47  [NFULA_MARK] = { .type = NLA_U32 },
48  [NFULA_TIMESTAMP] = {
49  .minlen = sizeof(struct nfulnl_msg_packet_timestamp)
50  },
51  [NFULA_IFINDEX_INDEV] = { .type = NLA_U32 },
52  [NFULA_IFINDEX_OUTDEV] = { .type = NLA_U32 },
53  [NFULA_IFINDEX_PHYSINDEV] = { .type = NLA_U32 },
54  [NFULA_IFINDEX_PHYSOUTDEV] = { .type = NLA_U32 },
55  [NFULA_HWADDR] = {
56  .minlen = sizeof(struct nfulnl_msg_packet_hw)
57  },
58  //[NFULA_PAYLOAD]
59  [NFULA_PREFIX] = { .type = NLA_STRING, },
60  [NFULA_UID] = { .type = NLA_U32 },
61  [NFULA_GID] = { .type = NLA_U32 },
62  [NFULA_SEQ] = { .type = NLA_U32 },
63  [NFULA_SEQ_GLOBAL] = { .type = NLA_U32 },
64 };
65 
66 int nfnlmsg_log_msg_parse(struct nlmsghdr *nlh, struct nfnl_log_msg **result)
67 {
68  struct nfnl_log_msg *msg;
69  struct nlattr *tb[NFULA_MAX+1];
70  struct nlattr *attr;
71  int err;
72 
73  msg = nfnl_log_msg_alloc();
74  if (!msg)
75  return -NLE_NOMEM;
76 
77  msg->ce_msgtype = nlh->nlmsg_type;
78 
79  err = nlmsg_parse(nlh, sizeof(struct nfgenmsg), tb, NFULA_MAX,
80  log_msg_policy);
81  if (err < 0)
82  goto errout;
83 
84  nfnl_log_msg_set_family(msg, nfnlmsg_family(nlh));
85 
86  attr = tb[NFULA_PACKET_HDR];
87  if (attr) {
88  struct nfulnl_msg_packet_hdr *hdr = nla_data(attr);
89 
90  if (hdr->hw_protocol)
91  nfnl_log_msg_set_hwproto(msg, hdr->hw_protocol);
92  nfnl_log_msg_set_hook(msg, hdr->hook);
93  }
94 
95  attr = tb[NFULA_MARK];
96  if (attr)
97  nfnl_log_msg_set_mark(msg, ntohl(nla_get_u32(attr)));
98 
99  attr = tb[NFULA_TIMESTAMP];
100  if (attr) {
101  struct nfulnl_msg_packet_timestamp *timestamp = nla_data(attr);
102  struct timeval tv;
103 
104  tv.tv_sec = ntohll(timestamp->sec);
105  tv.tv_usec = ntohll(timestamp->usec);
106  nfnl_log_msg_set_timestamp(msg, &tv);
107  }
108 
109  attr = tb[NFULA_IFINDEX_INDEV];
110  if (attr)
111  nfnl_log_msg_set_indev(msg, ntohl(nla_get_u32(attr)));
112 
113  attr = tb[NFULA_IFINDEX_OUTDEV];
114  if (attr)
115  nfnl_log_msg_set_outdev(msg, ntohl(nla_get_u32(attr)));
116 
117  attr = tb[NFULA_IFINDEX_PHYSINDEV];
118  if (attr)
119  nfnl_log_msg_set_physindev(msg, ntohl(nla_get_u32(attr)));
120 
121  attr = tb[NFULA_IFINDEX_PHYSOUTDEV];
122  if (attr)
123  nfnl_log_msg_set_physoutdev(msg, ntohl(nla_get_u32(attr)));
124 
125  attr = tb[NFULA_HWADDR];
126  if (attr) {
127  struct nfulnl_msg_packet_hw *hw = nla_data(attr);
128 
129  nfnl_log_msg_set_hwaddr(msg, hw->hw_addr, ntohs(hw->hw_addrlen));
130  }
131 
132  attr = tb[NFULA_PAYLOAD];
133  if (attr) {
134  err = nfnl_log_msg_set_payload(msg, nla_data(attr), nla_len(attr));
135  if (err < 0)
136  goto errout;
137  }
138 
139  attr = tb[NFULA_PREFIX];
140  if (attr) {
141  err = nfnl_log_msg_set_prefix(msg, nla_data(attr));
142  if (err < 0)
143  goto errout;
144  }
145 
146  attr = tb[NFULA_UID];
147  if (attr)
148  nfnl_log_msg_set_uid(msg, ntohl(nla_get_u32(attr)));
149 
150  attr = tb[NFULA_GID];
151  if (attr)
152  nfnl_log_msg_set_gid(msg, ntohl(nla_get_u32(attr)));
153 
154  attr = tb[NFULA_SEQ];
155  if (attr)
156  nfnl_log_msg_set_seq(msg, ntohl(nla_get_u32(attr)));
157 
158  attr = tb[NFULA_SEQ_GLOBAL];
159  if (attr)
160  nfnl_log_msg_set_seq_global(msg, ntohl(nla_get_u32(attr)));
161 
162  *result = msg;
163  return 0;
164 
165 errout:
166  nfnl_log_msg_put(msg);
167  return err;
168 }
169 
170 static int log_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
171  struct nlmsghdr *nlh, struct nl_parser_param *pp)
172 {
173  struct nfnl_log_msg *msg;
174  int err;
175 
176  if ((err = nfnlmsg_log_msg_parse(nlh, &msg)) < 0)
177  goto errout;
178 
179  err = pp->pp_cb((struct nl_object *) msg, pp);
180 errout:
181  nfnl_log_msg_put(msg);
182  return err;
183 }
184 
185 /** @} */
186 
187 #define NFNLMSG_LOG_TYPE(type) NFNLMSG_TYPE(NFNL_SUBSYS_ULOG, (type))
188 static struct nl_cache_ops nfnl_log_msg_ops = {
189  .co_name = "netfilter/log_msg",
190  .co_hdrsize = NFNL_HDRLEN,
191  .co_msgtypes = {
192  { NFNLMSG_LOG_TYPE(NFULNL_MSG_PACKET), NL_ACT_NEW, "new" },
193  END_OF_MSGTYPES_LIST,
194  },
195  .co_protocol = NETLINK_NETFILTER,
196  .co_msg_parser = log_msg_parser,
197  .co_obj_ops = &log_msg_obj_ops,
198 };
199 
200 static void __init log_msg_init(void)
201 {
202  nl_cache_mngt_register(&nfnl_log_msg_ops);
203 }
204 
205 static void __exit log_msg_exit(void)
206 {
207  nl_cache_mngt_unregister(&nfnl_log_msg_ops);
208 }
209 
210 /** @} */