--- /dev/null
+/*-
+ * Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: head/sys/netinet/ipfw/ip_fw_private.h 200601 2009-12-16 10:48:40Z luigi $
+ */
+
+#ifndef _IPFW2_PRIVATE_H
+#define _IPFW2_PRIVATE_H
+
+/*
+ * Internal constants and data structures used by ipfw components
+ * and not meant to be exported outside the kernel.
+ */
+
+#ifdef _KERNEL
+
+#define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */
+#define MTAG_IPFW_RULE 1262273568 /* rule reference */
+
+/* Return values from ipfw_chk() */
+enum {
+ IP_FW_PASS = 0,
+ IP_FW_DENY,
+ IP_FW_DIVERT,
+ IP_FW_TEE,
+ IP_FW_DUMMYNET,
+ IP_FW_NETGRAPH,
+ IP_FW_NGTEE,
+ IP_FW_NAT,
+ IP_FW_REASS,
+};
+
+/*
+ * Structure for collecting parameters to dummynet for ip6_output forwarding
+ */
+struct _ip6dn_args {
+ struct ip6_pktopts *opt_or;
+ struct route_in6 ro_or;
+ int flags_or;
+ struct ip6_moptions *im6o_or;
+ struct ifnet *origifp_or;
+ struct ifnet *ifp_or;
+ struct sockaddr_in6 dst_or;
+ u_long mtu_or;
+ struct route_in6 ro_pmtu_or;
+};
+
+/*
+ * Reference to an ipfw rule that can be carried outside critical sections.
+ * A rule is identified by rulenum:rule_id which is ordered.
+ * In version chain_id the rule can be found in slot 'slot', so
+ * we don't need a lookup if chain_id == chain->id.
+ *
+ * On exit from the firewall this structure refers to the rule after
+ * the matching one (slot points to the new rule; rulenum:rule_id-1
+ * is the matching rule), and additional info (e.g. info often contains
+ * the insn argument or tablearg in the low 16 bits, in host format).
+ * On entry, the structure is valid if slot>0, and refers to the starting
+ * rules. 'info' contains the reason for reinject, e.g. divert port,
+ * divert direction, and so on.
+ */
+struct ipfw_rule_ref {
+ uint32_t slot; /* slot for matching rule */
+ uint32_t rulenum; /* matching rule number */
+ uint32_t rule_id; /* matching rule id */
+ uint32_t chain_id; /* ruleset id */
+ uint32_t info; /* see below */
+};
+
+enum {
+ IPFW_INFO_MASK = 0x0000ffff,
+ IPFW_INFO_OUT = 0x00000000, /* outgoing, just for convenience */
+ IPFW_INFO_IN = 0x80000000, /* incoming, overloads dir */
+ IPFW_ONEPASS = 0x40000000, /* One-pass, do not reinject */
+ IPFW_IS_MASK = 0x30000000, /* which source ? */
+ IPFW_IS_DIVERT = 0x20000000,
+ IPFW_IS_DUMMYNET =0x10000000,
+ IPFW_IS_PIPE = 0x08000000, /* pip1=1, queue = 0 */
+};
+
+/*
+ * Arguments for calling ipfw_chk() and dummynet_io(). We put them
+ * all into a structure because this way it is easier and more
+ * efficient to pass variables around and extend the interface.
+ */
+struct ip_fw_args {
+ struct mbuf *m; /* the mbuf chain */
+ struct ifnet *oif; /* output interface */
+ struct sockaddr_in *next_hop; /* forward address */
+
+ /*
+ * On return, it points to the matching rule.
+ * On entry, rule.slot > 0 means the info is valid and
+ * contains the the starting rule for an ipfw search.
+ * If chain_id == chain->id && slot >0 then jump to that slot.
+ * Otherwise, we locate the first rule >= rulenum:rule_id
+ */
+ struct ipfw_rule_ref rule; /* match/restart info */
+
+ struct ether_header *eh; /* for bridged packets */
+
+ struct ipfw_flow_id f_id; /* grabbed from IP header */
+ //uint32_t cookie; /* a cookie depending on rule action */
+ struct inpcb *inp;
+
+ struct _ip6dn_args dummypar; /* dummynet->ip6_output */
+ struct sockaddr_in hopstore; /* store here if cannot use a pointer */
+};
+
+MALLOC_DECLARE(M_IPFW);
+
+/*
+ * Hooks sometime need to know the direction of the packet
+ * (divert, dummynet, netgraph, ...)
+ * We use a generic definition here, with bit0-1 indicating the
+ * direction, bit 2 indicating layer2 or 3, bit 3-4 indicating the
+ * specific protocol
+ * indicating the protocol (if necessary)
+ */
+enum {
+ DIR_MASK = 0x3,
+ DIR_OUT = 0,
+ DIR_IN = 1,
+ DIR_FWD = 2,
+ DIR_DROP = 3,
+ PROTO_LAYER2 = 0x4, /* set for layer 2 */
+ /* PROTO_DEFAULT = 0, */
+ PROTO_IPV4 = 0x08,
+ PROTO_IPV6 = 0x10,
+ PROTO_IFB = 0x0c, /* layer2 + ifbridge */
+ /* PROTO_OLDBDG = 0x14, unused, old bridge */
+};
+
+/* wrapper for freeing a packet, in case we need to do more work */
+#ifdef __linux__
+#define FREE_PKT(m) netisr_dispatch(-1, m)
+#else
+#define FREE_PKT(m) m_freem(m)
+#endif
+
+/*
+ * Function definitions.
+ */
+
+/* attach (arg = 1) or detach (arg = 0) hooks */
+int ipfw_attach_hooks(int);
+#ifdef NOTYET
+void ipfw_nat_destroy(void);
+#endif
+
+/* In ip_fw_log.c */
+struct ip;
+void ipfw_log_bpf(int);
+void ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args,
+ struct mbuf *m, struct ifnet *oif, u_short offset, uint32_t tablearg,
+ struct ip *ip);
+VNET_DECLARE(u_int64_t, norule_counter);
+#define V_norule_counter VNET(norule_counter)
+VNET_DECLARE(int, verbose_limit);
+#define V_verbose_limit VNET(verbose_limit)
+
+/* In ip_fw_dynamic.c */
+
+enum { /* result for matching dynamic rules */
+ MATCH_REVERSE = 0,
+ MATCH_FORWARD,
+ MATCH_NONE,
+ MATCH_UNKNOWN,
+};
+
+/*
+ * The lock for dynamic rules is only used once outside the file,
+ * and only to release the result of lookup_dyn_rule().
+ * Eventually we may implement it with a callback on the function.
+ */
+void ipfw_dyn_unlock(void);
+
+struct tcphdr;
+struct mbuf *ipfw_send_pkt(struct mbuf *, struct ipfw_flow_id *,
+ u_int32_t, u_int32_t, int);
+int ipfw_install_state(struct ip_fw *rule, ipfw_insn_limit *cmd,
+ struct ip_fw_args *args, uint32_t tablearg);
+ipfw_dyn_rule *ipfw_lookup_dyn_rule(struct ipfw_flow_id *pkt,
+ int *match_direction, struct tcphdr *tcp);
+void ipfw_remove_dyn_children(struct ip_fw *rule);
+void ipfw_get_dynamic(char **bp, const char *ep);
+
+void ipfw_dyn_attach(void); /* uma_zcreate .... */
+void ipfw_dyn_detach(void); /* uma_zdestroy ... */
+void ipfw_dyn_init(void); /* per-vnet initialization */
+void ipfw_dyn_uninit(int); /* per-vnet deinitialization */
+int ipfw_dyn_len(void);
+
+/* common variables */
+VNET_DECLARE(int, fw_one_pass);
+#define V_fw_one_pass VNET(fw_one_pass)
+
+VNET_DECLARE(int, fw_verbose);
+#define V_fw_verbose VNET(fw_verbose)
+
+VNET_DECLARE(struct ip_fw_chain, layer3_chain);
+#define V_layer3_chain VNET(layer3_chain)
+
+VNET_DECLARE(u_int32_t, set_disable);
+#define V_set_disable VNET(set_disable)
+
+VNET_DECLARE(int, autoinc_step);
+#define V_autoinc_step VNET(autoinc_step)
+
+struct ip_fw_chain {
+ struct ip_fw *rules; /* list of rules */
+ struct ip_fw *reap; /* list of rules to reap */
+ struct ip_fw *default_rule;
+ int n_rules; /* number of static rules */
+ int static_len; /* total len of static rules */
+ struct ip_fw **map; /* array of rule ptrs to ease lookup */
+ LIST_HEAD(nat_list, cfg_nat) nat; /* list of nat entries */
+ struct radix_node_head *tables[IPFW_TABLES_MAX];
+#if defined( __linux__ ) || defined( _WIN32 )
+ spinlock_t rwmtx;
+ spinlock_t uh_lock;
+#else
+ struct rwlock rwmtx;
+ struct rwlock uh_lock; /* lock for upper half */
+#endif
+ uint32_t id; /* ruleset id */
+};
+
+struct sockopt; /* used by tcp_var.h */
+
+/*
+ * The lock is heavily used by ip_fw2.c (the main file) and ip_fw_nat.c
+ * so the variable and the macros must be here.
+ */
+
+#define IPFW_LOCK_INIT(_chain) do { \
+ rw_init(&(_chain)->rwmtx, "IPFW static rules"); \
+ rw_init(&(_chain)->uh_lock, "IPFW UH lock"); \
+ } while (0)
+
+#define IPFW_LOCK_DESTROY(_chain) do { \
+ rw_destroy(&(_chain)->rwmtx); \
+ rw_destroy(&(_chain)->uh_lock); \
+ } while (0)
+
+#define IPFW_WLOCK_ASSERT(_chain) rw_assert(&(_chain)->rwmtx, RA_WLOCKED)
+
+#define IPFW_RLOCK(p) rw_rlock(&(p)->rwmtx)
+#define IPFW_RUNLOCK(p) rw_runlock(&(p)->rwmtx)
+#define IPFW_WLOCK(p) rw_wlock(&(p)->rwmtx)
+#define IPFW_WUNLOCK(p) rw_wunlock(&(p)->rwmtx)
+
+#define IPFW_UH_RLOCK(p) rw_rlock(&(p)->uh_lock)
+#define IPFW_UH_RUNLOCK(p) rw_runlock(&(p)->uh_lock)
+#define IPFW_UH_WLOCK(p) rw_wlock(&(p)->uh_lock)
+#define IPFW_UH_WUNLOCK(p) rw_wunlock(&(p)->uh_lock)
+
+/* In ip_fw_sockopt.c */
+int ipfw_find_rule(struct ip_fw_chain *chain, uint32_t key, uint32_t id);
+int ipfw_add_rule(struct ip_fw_chain *chain, struct ip_fw *input_rule);
+int ipfw_ctl(struct sockopt *sopt);
+int ipfw_chk(struct ip_fw_args *args);
+void ipfw_reap_rules(struct ip_fw *head);
+
+/* In ip_fw_table.c */
+struct radix_node;
+int ipfw_lookup_table(struct ip_fw_chain *ch, uint16_t tbl, in_addr_t addr,
+ uint32_t *val);
+int ipfw_init_tables(struct ip_fw_chain *ch);
+int ipfw_flush_table(struct ip_fw_chain *ch, uint16_t tbl);
+void ipfw_flush_tables(struct ip_fw_chain *ch);
+int ipfw_add_table_entry(struct ip_fw_chain *ch, uint16_t tbl, in_addr_t addr,
+ uint8_t mlen, uint32_t value);
+int ipfw_dump_table_entry(struct radix_node *rn, void *arg);
+int ipfw_del_table_entry(struct ip_fw_chain *ch, uint16_t tbl, in_addr_t addr,
+ uint8_t mlen);
+int ipfw_count_table(struct ip_fw_chain *ch, uint32_t tbl, uint32_t *cnt);
+int ipfw_dump_table(struct ip_fw_chain *ch, ipfw_table *tbl);
+
+/* hooks for divert */
+extern void (*ip_divert_ptr)(struct mbuf *m, int incoming);
+
+/* In ip_fw_nat.c */
+
+extern struct cfg_nat *(*lookup_nat_ptr)(struct nat_list *, int);
+
+typedef int ipfw_nat_t(struct ip_fw_args *, struct cfg_nat *, struct mbuf *);
+typedef int ipfw_nat_cfg_t(struct sockopt *);
+
+extern ipfw_nat_t *ipfw_nat_ptr;
+#define IPFW_NAT_LOADED (ipfw_nat_ptr != NULL)
+
+extern ipfw_nat_cfg_t *ipfw_nat_cfg_ptr;
+extern ipfw_nat_cfg_t *ipfw_nat_del_ptr;
+extern ipfw_nat_cfg_t *ipfw_nat_get_cfg_ptr;
+extern ipfw_nat_cfg_t *ipfw_nat_get_log_ptr;
+
+/* netgraph prototypes */
+
+typedef int ng_ipfw_input_t(struct mbuf **, int, struct ip_fw_args *, int);
+extern ng_ipfw_input_t *ng_ipfw_input_p;
+#define NG_IPFW_LOADED (ng_ipfw_input_p != NULL)
+
+#define TAGSIZ (sizeof(struct ng_ipfw_tag) - sizeof(struct m_tag))
+
+
+#endif /* _KERNEL */
+#endif /* _IPFW2_PRIVATE_H */
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