libnl  3.2.7
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-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 /** @} */