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 #include <sys/param.h> 29 #include <sys/systm.h> 30 #include <sys/mbuf.h> 31 #include <sys/kernel.h> 32 #include <sys/lock.h> 33 #include <sys/socket.h> 34 #include <net/ethernet.h> 35 #include <net/if.h> 36 #include <net/if_pflog.h> 37 #include <net/if_var.h> 38 #include <net/if_clone.h> 39 #include <net/if_private.h> 40 #include <net/if_types.h> 41 #include <net/vnet.h> 42 #include <net/bpf.h> 43 44 #include <netinet/in.h> 45 #include <netinet/ip_fw.h> 46 #include <netinet/ip_var.h> 47 #include <netpfil/ipfw/ip_fw_private.h> 48 49 VNET_DEFINE_STATIC(struct ifnet *, log_if); 50 VNET_DEFINE_STATIC(struct ifnet *, pflog_if); 51 VNET_DEFINE_STATIC(struct if_clone *, ipfw_cloner); 52 VNET_DEFINE_STATIC(struct if_clone *, ipfwlog_cloner); 53 #define V_ipfw_cloner VNET(ipfw_cloner) 54 #define V_ipfwlog_cloner VNET(ipfwlog_cloner) 55 #define V_log_if VNET(log_if) 56 #define V_pflog_if VNET(pflog_if) 57 58 static const char ipfwname[] = "ipfw"; 59 static const char ipfwlogname[] = "ipfwlog"; 60 61 static int 62 ipfw_bpf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr) 63 { 64 65 return (EINVAL); 66 } 67 68 static int 69 ipfw_bpf_output(struct ifnet *ifp, struct mbuf *m, 70 const struct sockaddr *dst, struct route *ro) 71 { 72 73 if (m != NULL) 74 FREE_PKT(m); 75 return (0); 76 } 77 78 static void 79 ipfw_clone_destroy(struct ifnet *ifp) 80 { 81 82 if (ifp->if_hdrlen == ETHER_HDR_LEN) 83 V_log_if = NULL; 84 else 85 V_pflog_if = NULL; 86 87 NET_EPOCH_WAIT(); 88 bpfdetach(ifp); 89 if_detach(ifp); 90 if_free(ifp); 91 } 92 93 static int 94 ipfw_clone_create(struct if_clone *ifc, int unit, caddr_t params) 95 { 96 struct ifnet *ifp; 97 98 ifp = if_alloc(IFT_PFLOG); 99 if (ifp == NULL) 100 return (ENOSPC); 101 if_initname(ifp, ipfwname, unit); 102 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; 103 ifp->if_mtu = 65536; 104 ifp->if_ioctl = ipfw_bpf_ioctl; 105 ifp->if_output = ipfw_bpf_output; 106 ifp->if_hdrlen = ETHER_HDR_LEN; 107 if_attach(ifp); 108 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 109 if (V_log_if != NULL) { 110 bpfdetach(ifp); 111 if_detach(ifp); 112 if_free(ifp); 113 return (EEXIST); 114 } 115 V_log_if = ifp; 116 return (0); 117 } 118 119 static int 120 ipfwlog_clone_create(struct if_clone *ifc, int unit, caddr_t params) 121 { 122 struct ifnet *ifp; 123 124 ifp = if_alloc(IFT_PFLOG); 125 if (ifp == NULL) 126 return (ENOSPC); 127 if_initname(ifp, ipfwlogname, unit); 128 ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST; 129 ifp->if_mtu = 65536; 130 ifp->if_ioctl = ipfw_bpf_ioctl; 131 ifp->if_output = ipfw_bpf_output; 132 ifp->if_hdrlen = PFLOG_HDRLEN; 133 if_attach(ifp); 134 bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN); 135 if (V_pflog_if != NULL) { 136 bpfdetach(ifp); 137 if_detach(ifp); 138 if_free(ifp); 139 return (EEXIST); 140 } 141 V_pflog_if = ifp; 142 return (0); 143 } 144 145 void 146 ipfw_bpf_tap(u_char *pkt, u_int pktlen) 147 { 148 struct ifnet *ifp = V_log_if; 149 150 NET_EPOCH_ASSERT(); 151 if (ifp != NULL) 152 BPF_TAP(ifp, pkt, pktlen); 153 } 154 155 void 156 ipfw_bpf_mtap(struct mbuf *m) 157 { 158 struct ifnet *ifp = V_log_if; 159 160 NET_EPOCH_ASSERT(); 161 if (ifp != NULL) 162 BPF_MTAP(ifp, m); 163 } 164 165 void 166 ipfw_bpf_mtap2(void *data, u_int dlen, struct mbuf *m) 167 { 168 struct ifnet *logif; 169 170 NET_EPOCH_ASSERT(); 171 switch (dlen) { 172 case (ETHER_HDR_LEN): 173 logif = V_log_if; 174 break; 175 case (PFLOG_HDRLEN): 176 logif = V_pflog_if; 177 break; 178 default: 179 #ifdef INVARIANTS 180 panic("%s: unsupported len %d", __func__, dlen); 181 #endif 182 logif = NULL; 183 } 184 185 if (logif != NULL) 186 BPF_MTAP2(logif, data, dlen, m); 187 } 188 189 void 190 ipfw_bpf_init(int first __unused) 191 { 192 193 V_log_if = NULL; 194 V_pflog_if = NULL; 195 V_ipfw_cloner = if_clone_simple(ipfwname, ipfw_clone_create, 196 ipfw_clone_destroy, 0); 197 V_ipfwlog_cloner = if_clone_simple(ipfwlogname, ipfwlog_clone_create, 198 ipfw_clone_destroy, 0); 199 } 200 201 void 202 ipfw_bpf_uninit(int last __unused) 203 { 204 205 if_clone_detach(V_ipfw_cloner); 206 if_clone_detach(V_ipfwlog_cloner); 207 } 208