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