ip_fw_private.h revision 244571
1/*- 2 * Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD: stable/9/sys/netpfil/ipfw/ip_fw_private.h 244571 2012-12-21 23:47:22Z melifaro $ 26 */ 27 28#ifndef _IPFW2_PRIVATE_H 29#define _IPFW2_PRIVATE_H 30 31/* 32 * Internal constants and data structures used by ipfw components 33 * and not meant to be exported outside the kernel. 34 */ 35 36#ifdef _KERNEL 37 38/* 39 * For platforms that do not have SYSCTL support, we wrap the 40 * SYSCTL_* into a function (one per file) to collect the values 41 * into an array at module initialization. The wrapping macros, 42 * SYSBEGIN() and SYSEND, are empty in the default case. 43 */ 44#ifndef SYSBEGIN 45#define SYSBEGIN(x) 46#endif 47#ifndef SYSEND 48#define SYSEND 49#endif 50 51/* Return values from ipfw_chk() */ 52enum { 53 IP_FW_PASS = 0, 54 IP_FW_DENY, 55 IP_FW_DIVERT, 56 IP_FW_TEE, 57 IP_FW_DUMMYNET, 58 IP_FW_NETGRAPH, 59 IP_FW_NGTEE, 60 IP_FW_NAT, 61 IP_FW_REASS, 62}; 63 64/* 65 * Structure for collecting parameters to dummynet for ip6_output forwarding 66 */ 67struct _ip6dn_args { 68 struct ip6_pktopts *opt_or; 69 struct route_in6 ro_or; 70 int flags_or; 71 struct ip6_moptions *im6o_or; 72 struct ifnet *origifp_or; 73 struct ifnet *ifp_or; 74 struct sockaddr_in6 dst_or; 75 u_long mtu_or; 76 struct route_in6 ro_pmtu_or; 77}; 78 79 80/* 81 * Arguments for calling ipfw_chk() and dummynet_io(). We put them 82 * all into a structure because this way it is easier and more 83 * efficient to pass variables around and extend the interface. 84 */ 85struct ip_fw_args { 86 struct mbuf *m; /* the mbuf chain */ 87 struct ifnet *oif; /* output interface */ 88 struct sockaddr_in *next_hop; /* forward address */ 89 struct sockaddr_in6 *next_hop6; /* ipv6 forward address */ 90 91 /* 92 * On return, it points to the matching rule. 93 * On entry, rule.slot > 0 means the info is valid and 94 * contains the starting rule for an ipfw search. 95 * If chain_id == chain->id && slot >0 then jump to that slot. 96 * Otherwise, we locate the first rule >= rulenum:rule_id 97 */ 98 struct ipfw_rule_ref rule; /* match/restart info */ 99 100 struct ether_header *eh; /* for bridged packets */ 101 102 struct ipfw_flow_id f_id; /* grabbed from IP header */ 103 //uint32_t cookie; /* a cookie depending on rule action */ 104 struct inpcb *inp; 105 106 struct _ip6dn_args dummypar; /* dummynet->ip6_output */ 107 struct sockaddr_in hopstore; /* store here if cannot use a pointer */ 108}; 109 110MALLOC_DECLARE(M_IPFW); 111 112/* 113 * Hooks sometime need to know the direction of the packet 114 * (divert, dummynet, netgraph, ...) 115 * We use a generic definition here, with bit0-1 indicating the 116 * direction, bit 2 indicating layer2 or 3, bit 3-4 indicating the 117 * specific protocol 118 * indicating the protocol (if necessary) 119 */ 120enum { 121 DIR_MASK = 0x3, 122 DIR_OUT = 0, 123 DIR_IN = 1, 124 DIR_FWD = 2, 125 DIR_DROP = 3, 126 PROTO_LAYER2 = 0x4, /* set for layer 2 */ 127 /* PROTO_DEFAULT = 0, */ 128 PROTO_IPV4 = 0x08, 129 PROTO_IPV6 = 0x10, 130 PROTO_IFB = 0x0c, /* layer2 + ifbridge */ 131 /* PROTO_OLDBDG = 0x14, unused, old bridge */ 132}; 133 134/* wrapper for freeing a packet, in case we need to do more work */ 135#ifndef FREE_PKT 136#if defined(__linux__) || defined(_WIN32) 137#define FREE_PKT(m) netisr_dispatch(-1, m) 138#else 139#define FREE_PKT(m) m_freem(m) 140#endif 141#endif /* !FREE_PKT */ 142 143/* 144 * Function definitions. 145 */ 146 147/* attach (arg = 1) or detach (arg = 0) hooks */ 148int ipfw_attach_hooks(int); 149#ifdef NOTYET 150void ipfw_nat_destroy(void); 151#endif 152 153/* In ip_fw_log.c */ 154struct ip; 155void ipfw_log_bpf(int); 156void ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args, 157 struct mbuf *m, struct ifnet *oif, u_short offset, uint32_t tablearg, 158 struct ip *ip); 159VNET_DECLARE(u_int64_t, norule_counter); 160#define V_norule_counter VNET(norule_counter) 161VNET_DECLARE(int, verbose_limit); 162#define V_verbose_limit VNET(verbose_limit) 163 164/* In ip_fw_dynamic.c */ 165 166enum { /* result for matching dynamic rules */ 167 MATCH_REVERSE = 0, 168 MATCH_FORWARD, 169 MATCH_NONE, 170 MATCH_UNKNOWN, 171}; 172 173/* 174 * The lock for dynamic rules is only used once outside the file, 175 * and only to release the result of lookup_dyn_rule(). 176 * Eventually we may implement it with a callback on the function. 177 */ 178struct ip_fw_chain; 179void ipfw_expire_dyn_rules(struct ip_fw_chain *, struct ip_fw *, int); 180void ipfw_dyn_unlock(ipfw_dyn_rule *q); 181 182struct tcphdr; 183struct mbuf *ipfw_send_pkt(struct mbuf *, struct ipfw_flow_id *, 184 u_int32_t, u_int32_t, int); 185int ipfw_install_state(struct ip_fw *rule, ipfw_insn_limit *cmd, 186 struct ip_fw_args *args, uint32_t tablearg); 187ipfw_dyn_rule *ipfw_lookup_dyn_rule(struct ipfw_flow_id *pkt, 188 int *match_direction, struct tcphdr *tcp); 189void ipfw_remove_dyn_children(struct ip_fw *rule); 190void ipfw_get_dynamic(struct ip_fw_chain *chain, char **bp, const char *ep); 191 192void ipfw_dyn_init(struct ip_fw_chain *); /* per-vnet initialization */ 193void ipfw_dyn_uninit(int); /* per-vnet deinitialization */ 194int ipfw_dyn_len(void); 195 196/* common variables */ 197VNET_DECLARE(int, fw_one_pass); 198#define V_fw_one_pass VNET(fw_one_pass) 199 200VNET_DECLARE(int, fw_verbose); 201#define V_fw_verbose VNET(fw_verbose) 202 203VNET_DECLARE(struct ip_fw_chain, layer3_chain); 204#define V_layer3_chain VNET(layer3_chain) 205 206VNET_DECLARE(u_int32_t, set_disable); 207#define V_set_disable VNET(set_disable) 208 209VNET_DECLARE(int, autoinc_step); 210#define V_autoinc_step VNET(autoinc_step) 211 212VNET_DECLARE(unsigned int, fw_tables_max); 213#define V_fw_tables_max VNET(fw_tables_max) 214 215struct ip_fw_chain { 216 struct ip_fw *rules; /* list of rules */ 217 struct ip_fw *reap; /* list of rules to reap */ 218 struct ip_fw *default_rule; 219 int n_rules; /* number of static rules */ 220 int static_len; /* total len of static rules */ 221 struct ip_fw **map; /* array of rule ptrs to ease lookup */ 222 LIST_HEAD(nat_list, cfg_nat) nat; /* list of nat entries */ 223 struct radix_node_head **tables; /* IPv4 tables */ 224 struct radix_node_head **xtables; /* extended tables */ 225 uint8_t *tabletype; /* Array of table types */ 226#if defined( __linux__ ) || defined( _WIN32 ) 227 spinlock_t rwmtx; 228 spinlock_t uh_lock; 229#else 230 struct rwlock rwmtx; 231 struct rwlock uh_lock; /* lock for upper half */ 232#endif 233 uint32_t id; /* ruleset id */ 234 uint32_t gencnt; /* generation count */ 235}; 236 237struct sockopt; /* used by tcp_var.h */ 238 239/* 240 * The lock is heavily used by ip_fw2.c (the main file) and ip_fw_nat.c 241 * so the variable and the macros must be here. 242 */ 243 244#define IPFW_LOCK_INIT(_chain) do { \ 245 rw_init(&(_chain)->rwmtx, "IPFW static rules"); \ 246 rw_init(&(_chain)->uh_lock, "IPFW UH lock"); \ 247 } while (0) 248 249#define IPFW_LOCK_DESTROY(_chain) do { \ 250 rw_destroy(&(_chain)->rwmtx); \ 251 rw_destroy(&(_chain)->uh_lock); \ 252 } while (0) 253 254#define IPFW_RLOCK_ASSERT(_chain) rw_assert(&(_chain)->rwmtx, RA_RLOCKED) 255#define IPFW_WLOCK_ASSERT(_chain) rw_assert(&(_chain)->rwmtx, RA_WLOCKED) 256 257#define IPFW_RLOCK(p) rw_rlock(&(p)->rwmtx) 258#define IPFW_RUNLOCK(p) rw_runlock(&(p)->rwmtx) 259#define IPFW_WLOCK(p) rw_wlock(&(p)->rwmtx) 260#define IPFW_WUNLOCK(p) rw_wunlock(&(p)->rwmtx) 261 262#define IPFW_UH_RLOCK_ASSERT(_chain) rw_assert(&(_chain)->uh_lock, RA_RLOCKED) 263#define IPFW_UH_WLOCK_ASSERT(_chain) rw_assert(&(_chain)->uh_lock, RA_WLOCKED) 264 265#define IPFW_UH_RLOCK(p) rw_rlock(&(p)->uh_lock) 266#define IPFW_UH_RUNLOCK(p) rw_runlock(&(p)->uh_lock) 267#define IPFW_UH_WLOCK(p) rw_wlock(&(p)->uh_lock) 268#define IPFW_UH_WUNLOCK(p) rw_wunlock(&(p)->uh_lock) 269 270/* In ip_fw_sockopt.c */ 271int ipfw_find_rule(struct ip_fw_chain *chain, uint32_t key, uint32_t id); 272int ipfw_add_rule(struct ip_fw_chain *chain, struct ip_fw *input_rule); 273int ipfw_ctl(struct sockopt *sopt); 274int ipfw_chk(struct ip_fw_args *args); 275void ipfw_reap_rules(struct ip_fw *head); 276 277/* In ip_fw_pfil */ 278int ipfw_check_hook(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir, 279 struct inpcb *inp); 280 281/* In ip_fw_table.c */ 282struct radix_node; 283int ipfw_lookup_table(struct ip_fw_chain *ch, uint16_t tbl, in_addr_t addr, 284 uint32_t *val); 285int ipfw_lookup_table_extended(struct ip_fw_chain *ch, uint16_t tbl, void *paddr, 286 uint32_t *val, int type); 287int ipfw_init_tables(struct ip_fw_chain *ch); 288void ipfw_destroy_tables(struct ip_fw_chain *ch); 289int ipfw_flush_table(struct ip_fw_chain *ch, uint16_t tbl); 290int ipfw_add_table_entry(struct ip_fw_chain *ch, uint16_t tbl, void *paddr, 291 uint8_t plen, uint8_t mlen, uint8_t type, uint32_t value); 292int ipfw_del_table_entry(struct ip_fw_chain *ch, uint16_t tbl, void *paddr, 293 uint8_t plen, uint8_t mlen, uint8_t type); 294int ipfw_count_table(struct ip_fw_chain *ch, uint32_t tbl, uint32_t *cnt); 295int ipfw_dump_table_entry(struct radix_node *rn, void *arg); 296int ipfw_dump_table(struct ip_fw_chain *ch, ipfw_table *tbl); 297int ipfw_count_xtable(struct ip_fw_chain *ch, uint32_t tbl, uint32_t *cnt); 298int ipfw_dump_xtable(struct ip_fw_chain *ch, ipfw_xtable *tbl); 299int ipfw_resize_tables(struct ip_fw_chain *ch, unsigned int ntables); 300 301/* In ip_fw_nat.c -- XXX to be moved to ip_var.h */ 302 303extern struct cfg_nat *(*lookup_nat_ptr)(struct nat_list *, int); 304 305typedef int ipfw_nat_t(struct ip_fw_args *, struct cfg_nat *, struct mbuf *); 306typedef int ipfw_nat_cfg_t(struct sockopt *); 307 308extern ipfw_nat_t *ipfw_nat_ptr; 309#define IPFW_NAT_LOADED (ipfw_nat_ptr != NULL) 310 311extern ipfw_nat_cfg_t *ipfw_nat_cfg_ptr; 312extern ipfw_nat_cfg_t *ipfw_nat_del_ptr; 313extern ipfw_nat_cfg_t *ipfw_nat_get_cfg_ptr; 314extern ipfw_nat_cfg_t *ipfw_nat_get_log_ptr; 315 316#endif /* _KERNEL */ 317#endif /* _IPFW2_PRIVATE_H */ 318