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83e96d44 PNA |
1 | /* (C) 1999-2001 Paul `Rusty' Russell |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/spinlock.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/if_arp.h> | |
13 | #include <linux/ip.h> | |
14 | #include <net/icmp.h> | |
15 | #include <net/udp.h> | |
16 | #include <net/tcp.h> | |
17 | #include <net/route.h> | |
18 | ||
19 | #include <linux/netfilter.h> | |
c737b7c4 | 20 | #include <linux/netfilter_bridge.h> |
83e96d44 PNA |
21 | #include <linux/netfilter/xt_LOG.h> |
22 | #include <net/netfilter/nf_log.h> | |
23 | ||
24 | int nf_log_dump_udp_header(struct nf_log_buf *m, const struct sk_buff *skb, | |
25 | u8 proto, int fragment, unsigned int offset) | |
26 | { | |
27 | struct udphdr _udph; | |
28 | const struct udphdr *uh; | |
29 | ||
30 | if (proto == IPPROTO_UDP) | |
31 | /* Max length: 10 "PROTO=UDP " */ | |
32 | nf_log_buf_add(m, "PROTO=UDP "); | |
33 | else /* Max length: 14 "PROTO=UDPLITE " */ | |
34 | nf_log_buf_add(m, "PROTO=UDPLITE "); | |
35 | ||
36 | if (fragment) | |
37 | goto out; | |
38 | ||
39 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
40 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
41 | if (uh == NULL) { | |
42 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset); | |
43 | ||
44 | return 1; | |
45 | } | |
46 | ||
47 | /* Max length: 20 "SPT=65535 DPT=65535 " */ | |
48 | nf_log_buf_add(m, "SPT=%u DPT=%u LEN=%u ", | |
49 | ntohs(uh->source), ntohs(uh->dest), ntohs(uh->len)); | |
50 | ||
51 | out: | |
52 | return 0; | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(nf_log_dump_udp_header); | |
55 | ||
56 | int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb, | |
57 | u8 proto, int fragment, unsigned int offset, | |
58 | unsigned int logflags) | |
59 | { | |
60 | struct tcphdr _tcph; | |
61 | const struct tcphdr *th; | |
62 | ||
63 | /* Max length: 10 "PROTO=TCP " */ | |
64 | nf_log_buf_add(m, "PROTO=TCP "); | |
65 | ||
66 | if (fragment) | |
67 | return 0; | |
68 | ||
69 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
70 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
71 | if (th == NULL) { | |
72 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset); | |
73 | return 1; | |
74 | } | |
75 | ||
76 | /* Max length: 20 "SPT=65535 DPT=65535 " */ | |
77 | nf_log_buf_add(m, "SPT=%u DPT=%u ", | |
78 | ntohs(th->source), ntohs(th->dest)); | |
79 | /* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */ | |
80 | if (logflags & XT_LOG_TCPSEQ) { | |
81 | nf_log_buf_add(m, "SEQ=%u ACK=%u ", | |
82 | ntohl(th->seq), ntohl(th->ack_seq)); | |
83 | } | |
84 | ||
85 | /* Max length: 13 "WINDOW=65535 " */ | |
86 | nf_log_buf_add(m, "WINDOW=%u ", ntohs(th->window)); | |
87 | /* Max length: 9 "RES=0x3C " */ | |
88 | nf_log_buf_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & | |
89 | TCP_RESERVED_BITS) >> 22)); | |
90 | /* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */ | |
91 | if (th->cwr) | |
92 | nf_log_buf_add(m, "CWR "); | |
93 | if (th->ece) | |
94 | nf_log_buf_add(m, "ECE "); | |
95 | if (th->urg) | |
96 | nf_log_buf_add(m, "URG "); | |
97 | if (th->ack) | |
98 | nf_log_buf_add(m, "ACK "); | |
99 | if (th->psh) | |
100 | nf_log_buf_add(m, "PSH "); | |
101 | if (th->rst) | |
102 | nf_log_buf_add(m, "RST "); | |
103 | if (th->syn) | |
104 | nf_log_buf_add(m, "SYN "); | |
105 | if (th->fin) | |
106 | nf_log_buf_add(m, "FIN "); | |
107 | /* Max length: 11 "URGP=65535 " */ | |
108 | nf_log_buf_add(m, "URGP=%u ", ntohs(th->urg_ptr)); | |
109 | ||
110 | if ((logflags & XT_LOG_TCPOPT) && th->doff*4 > sizeof(struct tcphdr)) { | |
111 | u_int8_t _opt[60 - sizeof(struct tcphdr)]; | |
112 | const u_int8_t *op; | |
113 | unsigned int i; | |
114 | unsigned int optsize = th->doff*4 - sizeof(struct tcphdr); | |
115 | ||
116 | op = skb_header_pointer(skb, offset + sizeof(struct tcphdr), | |
117 | optsize, _opt); | |
118 | if (op == NULL) { | |
119 | nf_log_buf_add(m, "OPT (TRUNCATED)"); | |
120 | return 1; | |
121 | } | |
122 | ||
123 | /* Max length: 127 "OPT (" 15*4*2chars ") " */ | |
124 | nf_log_buf_add(m, "OPT ("); | |
125 | for (i = 0; i < optsize; i++) | |
126 | nf_log_buf_add(m, "%02X", op[i]); | |
127 | ||
128 | nf_log_buf_add(m, ") "); | |
129 | } | |
130 | ||
131 | return 0; | |
132 | } | |
133 | EXPORT_SYMBOL_GPL(nf_log_dump_tcp_header); | |
134 | ||
135 | void nf_log_dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk) | |
136 | { | |
a8399231 | 137 | if (!sk || !sk_fullsock(sk)) |
83e96d44 PNA |
138 | return; |
139 | ||
140 | read_lock_bh(&sk->sk_callback_lock); | |
141 | if (sk->sk_socket && sk->sk_socket->file) { | |
142 | const struct cred *cred = sk->sk_socket->file->f_cred; | |
143 | nf_log_buf_add(m, "UID=%u GID=%u ", | |
144 | from_kuid_munged(&init_user_ns, cred->fsuid), | |
145 | from_kgid_munged(&init_user_ns, cred->fsgid)); | |
146 | } | |
147 | read_unlock_bh(&sk->sk_callback_lock); | |
148 | } | |
149 | EXPORT_SYMBOL_GPL(nf_log_dump_sk_uid_gid); | |
150 | ||
151 | void | |
152 | nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf, | |
153 | unsigned int hooknum, const struct sk_buff *skb, | |
154 | const struct net_device *in, | |
155 | const struct net_device *out, | |
156 | const struct nf_loginfo *loginfo, const char *prefix) | |
157 | { | |
158 | nf_log_buf_add(m, KERN_SOH "%c%sIN=%s OUT=%s ", | |
159 | '0' + loginfo->u.log.level, prefix, | |
160 | in ? in->name : "", | |
161 | out ? out->name : ""); | |
1109a90c | 162 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
83e96d44 PNA |
163 | if (skb->nf_bridge) { |
164 | const struct net_device *physindev; | |
165 | const struct net_device *physoutdev; | |
166 | ||
c737b7c4 | 167 | physindev = nf_bridge_get_physindev(skb); |
83e96d44 PNA |
168 | if (physindev && in != physindev) |
169 | nf_log_buf_add(m, "PHYSIN=%s ", physindev->name); | |
c737b7c4 | 170 | physoutdev = nf_bridge_get_physoutdev(skb); |
83e96d44 PNA |
171 | if (physoutdev && out != physoutdev) |
172 | nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name); | |
173 | } | |
174 | #endif | |
175 | } | |
176 | EXPORT_SYMBOL_GPL(nf_log_dump_packet_common); | |
177 | ||
178 | static int __init nf_log_common_init(void) | |
179 | { | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static void __exit nf_log_common_exit(void) {} | |
184 | ||
185 | module_init(nf_log_common_init); | |
186 | module_exit(nf_log_common_exit); | |
187 | ||
188 | MODULE_LICENSE("GPL"); |