2 * Copyright (c) 2015 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Bill Yuan <bycn82@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/socketvar.h>
39 #include <sys/sysctl.h>
40 #include <sys/systimer.h>
41 #include <sys/param.h>
42 #include <sys/ucred.h>
44 #include <netinet/in_var.h>
45 #include <netinet/ip_var.h>
46 #include <netinet/in.h>
47 #include <netinet/in_systm.h>
48 #include <netinet/in_var.h>
49 #include <netinet/in_pcb.h>
50 #include <netinet/ip.h>
51 #include <netinet/ip_var.h>
52 #include <netinet/ip_icmp.h>
53 #include <netinet/tcp.h>
54 #include <netinet/tcp_timer.h>
55 #include <netinet/tcp_var.h>
56 #include <netinet/tcpip.h>
57 #include <netinet/udp.h>
58 #include <netinet/udp_var.h>
59 #include <netinet/if_ether.h>
61 #include <net/ethernet.h>
62 #include <net/netmsg2.h>
63 #include <net/netisr2.h>
64 #include <net/route.h>
66 #include <net/ipfw3/ip_fw.h>
68 #include "ip_fw3_layer4.h"
71 check_tcpflag(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
72 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len);
74 check_uid(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
75 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len);
77 check_gid(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
78 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len);
80 check_established(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
81 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len);
84 * ipfw_match_guid can match the gui and uid
87 ipfw_match_guid(const struct ipfw_flow_id *fid, struct ifnet *oif,
88 int opcode, uid_t uid)
90 struct in_addr src_ip, dst_ip;
95 if (fid->proto == IPPROTO_TCP) {
97 pi = &tcbinfo[mycpuid];
98 } else if (fid->proto == IPPROTO_UDP) {
100 pi = &udbinfo[mycpuid];
106 * Values in 'fid' are in host byte order
108 dst_ip.s_addr = htonl(fid->dst_ip);
109 src_ip.s_addr = htonl(fid->src_ip);
111 pcb = in_pcblookup_hash(pi,
112 dst_ip, htons(fid->dst_port),
113 src_ip, htons(fid->src_port),
116 pcb = in_pcblookup_hash(pi,
117 src_ip, htons(fid->src_port),
118 dst_ip, htons(fid->dst_port),
121 if (pcb == NULL || pcb->inp_socket == NULL) {
125 if (opcode == O_LAYER4_UID) {
126 #define socheckuid(a,b) ((a)->so_cred->cr_uid != (b))
127 return !socheckuid(pcb->inp_socket, uid);
130 return groupmember(uid, pcb->inp_socket->so_cred);
135 check_tcpflag(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
136 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len)
138 /* XXX TODO check tcpflag */
140 *cmd_ctl = IP_FW_CTL_NO;
144 check_uid(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
145 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len)
147 *cmd_val = ipfw_match_guid(&(*args)->f_id, (*args)->oif, cmd->opcode,
148 (uid_t)((ipfw_insn_u32 *)cmd)->d[0]);
149 *cmd_ctl = IP_FW_CTL_NO;
153 check_gid(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
154 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len)
156 *cmd_val = ipfw_match_guid(&(*args)->f_id, (*args)->oif, cmd->opcode,
157 (gid_t)((ipfw_insn_u32 *)cmd)->d[0]);
158 *cmd_ctl = IP_FW_CTL_NO;
162 * match TCP packets which have all tcpflag except SYN.
164 void check_established(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args,
165 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len)
167 struct ipfw_flow_id *fid;
168 struct mbuf *m = (*args)->m;
169 struct ip *ip = mtod(m, struct ip *);
171 *cmd_ctl = IP_FW_CTL_NO;
172 fid = &(*args)->f_id;
173 if (fid->proto == IPPROTO_TCP) {
175 if ((L3HDR(struct tcphdr, ip)->th_flags &
176 (TH_RST | TH_ACK | TH_SYN)) != TH_SYN) {
177 *cmd_val = IP_FW_MATCH;
181 *cmd_val = IP_FW_NOT_MATCH;
185 ipfw3_layer4_init(void)
187 register_ipfw_module(MODULE_LAYER4_ID, MODULE_LAYER4_NAME);
188 register_ipfw_filter_funcs(MODULE_LAYER4_ID, O_LAYER4_TCPFLAG,
189 (filter_func)check_tcpflag);
190 register_ipfw_filter_funcs(MODULE_LAYER4_ID, O_LAYER4_UID,
191 (filter_func)check_uid);
192 register_ipfw_filter_funcs(MODULE_LAYER4_ID, O_LAYER4_GID,
193 (filter_func)check_gid);
194 register_ipfw_filter_funcs(MODULE_LAYER4_ID, O_LAYER4_ESTABLISHED,
195 (filter_func)check_established);
200 ipfw3_layer4_stop(void)
202 return unregister_ipfw_module(MODULE_LAYER4_ID);
206 ipfw3_layer4_modevent(module_t mod, int type, void *data)
210 return ipfw3_layer4_init();
212 return ipfw3_layer4_stop();
219 static moduledata_t ipfw3_layer4_mod = {
221 ipfw3_layer4_modevent,
224 DECLARE_MODULE(ipfw3_layer4, ipfw3_layer4_mod, SI_SUB_PROTO_END, SI_ORDER_ANY);
225 MODULE_DEPEND(ipfw3_layer4, ipfw3_basic, 1, 1, 1);
226 MODULE_VERSION(ipfw3_layer4, 1);