1 /*-
2 * Copyright (c) 2016 Yandex LLC
3 * Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/mbuf.h>
33 #include <sys/kernel.h>
34 #include <sys/lock.h>
35 #include <sys/socket.h>
36 #include <net/ethernet.h>
37 #include <net/if.h>
38 #include <net/if_pflog.h>
39 #include <net/if_var.h>
40 #include <net/if_clone.h>
41 #include <net/if_types.h>
42 #include <net/vnet.h>
43 #include <net/bpf.h>
44
45 #include <netinet/in.h>
46 #include <netinet/ip_fw.h>
47 #include <netinet/ip_var.h>
48 #include <netpfil/ipfw/ip_fw_private.h>
49
50 VNET_DEFINE_STATIC(struct ifnet *, log_if);
51 VNET_DEFINE_STATIC(struct ifnet *, pflog_if);
52 VNET_DEFINE_STATIC(struct if_clone *, ipfw_cloner);
53 VNET_DEFINE_STATIC(struct if_clone *, ipfwlog_cloner);
54 #define V_ipfw_cloner VNET(ipfw_cloner)
55 #define V_ipfwlog_cloner VNET(ipfwlog_cloner)
56 #define V_log_if VNET(log_if)
57 #define V_pflog_if VNET(pflog_if)
58
59 static const char ipfwname[] = "ipfw";
60 static const char ipfwlogname[] = "ipfwlog";
61
62 static int
63 ipfw_bpf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
64 {
65
66 return (EINVAL);
67 }
68
69 static int
70 ipfw_bpf_output(struct ifnet *ifp, struct mbuf *m,
71 const struct sockaddr *dst, struct route *ro)
72 {
73
74 if (m != NULL)
75 FREE_PKT(m);
76 return (0);
77 }
78
79 static void
80 ipfw_clone_destroy(struct ifnet *ifp)
81 {
82
83 if (ifp->if_hdrlen == ETHER_HDR_LEN)
84 V_log_if = NULL;
85 else
86 V_pflog_if = NULL;
87
88 NET_EPOCH_WAIT();
89 bpfdetach(ifp);
90 if_detach(ifp);
91 if_free(ifp);
92 }
93
94 static int
95 ipfw_clone_create(struct if_clone *ifc, int unit, caddr_t params)
96 {
97 struct ifnet *ifp;
98
99 ifp = if_alloc(IFT_PFLOG);
100 if (ifp == NULL)
101 return (ENOSPC);
102 if_initname(ifp, ipfwname, unit);
103 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
104 ifp->if_mtu = 65536;
105 ifp->if_ioctl = ipfw_bpf_ioctl;
106 ifp->if_output = ipfw_bpf_output;
107 ifp->if_hdrlen = ETHER_HDR_LEN;
108 if_attach(ifp);
109 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
110 if (V_log_if != NULL) {
111 bpfdetach(ifp);
112 if_detach(ifp);
113 if_free(ifp);
114 return (EEXIST);
115 }
116 V_log_if = ifp;
117 return (0);
118 }
119
120 static int
121 ipfwlog_clone_create(struct if_clone *ifc, int unit, caddr_t params)
122 {
123 struct ifnet *ifp;
124
125 ifp = if_alloc(IFT_PFLOG);
126 if (ifp == NULL)
127 return (ENOSPC);
128 if_initname(ifp, ipfwlogname, unit);
129 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
130 ifp->if_mtu = 65536;
131 ifp->if_ioctl = ipfw_bpf_ioctl;
132 ifp->if_output = ipfw_bpf_output;
133 ifp->if_hdrlen = PFLOG_HDRLEN;
134 if_attach(ifp);
135 bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN);
136 if (V_pflog_if != NULL) {
137 bpfdetach(ifp);
138 if_detach(ifp);
139 if_free(ifp);
140 return (EEXIST);
141 }
142 V_pflog_if = ifp;
143 return (0);
144 }
145
146 void
147 ipfw_bpf_tap(u_char *pkt, u_int pktlen)
148 {
149 struct ifnet *ifp = V_log_if;
150
151 NET_EPOCH_ASSERT();
152 if (ifp != NULL)
153 BPF_TAP(ifp, pkt, pktlen);
154 }
155
156 void
157 ipfw_bpf_mtap(struct mbuf *m)
158 {
159 struct ifnet *ifp = V_log_if;
160
161 NET_EPOCH_ASSERT();
162 if (ifp != NULL)
163 BPF_MTAP(ifp, m);
164 }
165
166 void
167 ipfw_bpf_mtap2(void *data, u_int dlen, struct mbuf *m)
168 {
169 struct ifnet *logif;
170
171 NET_EPOCH_ASSERT();
172 switch (dlen) {
173 case (ETHER_HDR_LEN):
174 logif = V_log_if;
175 break;
176 case (PFLOG_HDRLEN):
177 logif = V_pflog_if;
178 break;
179 default:
180 #ifdef INVARIANTS
181 panic("%s: unsupported len %d", __func__, dlen);
182 #endif
183 logif = NULL;
184 }
185
186 if (logif != NULL)
187 BPF_MTAP2(logif, data, dlen, m);
188 }
189
190 void
191 ipfw_bpf_init(int first __unused)
192 {
193
194 V_log_if = NULL;
195 V_pflog_if = NULL;
196 V_ipfw_cloner = if_clone_simple(ipfwname, ipfw_clone_create,
197 ipfw_clone_destroy, 0);
198 V_ipfwlog_cloner = if_clone_simple(ipfwlogname, ipfwlog_clone_create,
199 ipfw_clone_destroy, 0);
200 }
201
202 void
203 ipfw_bpf_uninit(int last __unused)
204 {
205
206 if_clone_detach(V_ipfw_cloner);
207 if_clone_detach(V_ipfwlog_cloner);
208 }
Cache object: aae343b0777b9fce359f6c46829797c9
|