302 lines
9.3 KiB
C
302 lines
9.3 KiB
C
/*-
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* Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _IPFW2_PRIVATE_H
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#define _IPFW2_PRIVATE_H
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/*
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* Internal constants and data structures used by ipfw components
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* and not meant to be exported outside the kernel.
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*/
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#ifdef _KERNEL
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/*
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* For platforms that do not have SYSCTL support, we wrap the
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* SYSCTL_* into a function (one per file) to collect the values
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* into an array at module initialization. The wrapping macros,
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* SYSBEGIN() and SYSEND, are empty in the default case.
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*/
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#ifndef SYSBEGIN
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#define SYSBEGIN(x)
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#endif
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#ifndef SYSEND
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#define SYSEND
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#endif
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/* Return values from ipfw_chk() */
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enum {
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IP_FW_PASS = 0,
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IP_FW_DENY,
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IP_FW_DIVERT,
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IP_FW_TEE,
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IP_FW_DUMMYNET,
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IP_FW_NETGRAPH,
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IP_FW_NGTEE,
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IP_FW_NAT,
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IP_FW_REASS,
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};
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/*
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* Structure for collecting parameters to dummynet for ip6_output forwarding
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*/
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struct _ip6dn_args {
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struct ip6_pktopts *opt_or;
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struct route_in6 ro_or;
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int flags_or;
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struct ip6_moptions *im6o_or;
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struct ifnet *origifp_or;
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struct ifnet *ifp_or;
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struct sockaddr_in6 dst_or;
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u_long mtu_or;
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struct route_in6 ro_pmtu_or;
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};
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/*
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* Arguments for calling ipfw_chk() and dummynet_io(). We put them
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* all into a structure because this way it is easier and more
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* efficient to pass variables around and extend the interface.
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*/
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struct ip_fw_args {
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struct mbuf *m; /* the mbuf chain */
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struct ifnet *oif; /* output interface */
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struct sockaddr_in *next_hop; /* forward address */
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/*
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* On return, it points to the matching rule.
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* On entry, rule.slot > 0 means the info is valid and
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* contains the the starting rule for an ipfw search.
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* If chain_id == chain->id && slot >0 then jump to that slot.
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* Otherwise, we locate the first rule >= rulenum:rule_id
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*/
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struct ipfw_rule_ref rule; /* match/restart info */
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struct ether_header *eh; /* for bridged packets */
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struct ipfw_flow_id f_id; /* grabbed from IP header */
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//uint32_t cookie; /* a cookie depending on rule action */
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struct inpcb *inp;
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struct _ip6dn_args dummypar; /* dummynet->ip6_output */
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struct sockaddr_in hopstore; /* store here if cannot use a pointer */
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};
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MALLOC_DECLARE(M_IPFW);
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/*
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* Hooks sometime need to know the direction of the packet
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* (divert, dummynet, netgraph, ...)
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* We use a generic definition here, with bit0-1 indicating the
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* direction, bit 2 indicating layer2 or 3, bit 3-4 indicating the
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* specific protocol
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* indicating the protocol (if necessary)
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*/
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enum {
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DIR_MASK = 0x3,
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DIR_OUT = 0,
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DIR_IN = 1,
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DIR_FWD = 2,
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DIR_DROP = 3,
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PROTO_LAYER2 = 0x4, /* set for layer 2 */
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/* PROTO_DEFAULT = 0, */
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PROTO_IPV4 = 0x08,
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PROTO_IPV6 = 0x10,
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PROTO_IFB = 0x0c, /* layer2 + ifbridge */
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/* PROTO_OLDBDG = 0x14, unused, old bridge */
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};
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/* wrapper for freeing a packet, in case we need to do more work */
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#ifndef FREE_PKT
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#if defined(__linux__) || defined(_WIN32)
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#define FREE_PKT(m) netisr_dispatch(-1, m)
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#else
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#define FREE_PKT(m) m_freem(m)
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#endif
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#endif /* !FREE_PKT */
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/*
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* Function definitions.
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*/
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/* attach (arg = 1) or detach (arg = 0) hooks */
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int ipfw_attach_hooks(int);
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#ifdef NOTYET
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void ipfw_nat_destroy(void);
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#endif
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/* In ip_fw_log.c */
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struct ip;
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void ipfw_log_bpf(int);
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void ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args,
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struct mbuf *m, struct ifnet *oif, u_short offset, uint32_t tablearg,
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struct ip *ip);
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VNET_DECLARE(u_int64_t, norule_counter);
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#define V_norule_counter VNET(norule_counter)
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VNET_DECLARE(int, verbose_limit);
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#define V_verbose_limit VNET(verbose_limit)
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/* In ip_fw_dynamic.c */
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enum { /* result for matching dynamic rules */
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MATCH_REVERSE = 0,
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MATCH_FORWARD,
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MATCH_NONE,
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MATCH_UNKNOWN,
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};
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/*
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* The lock for dynamic rules is only used once outside the file,
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* and only to release the result of lookup_dyn_rule().
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* Eventually we may implement it with a callback on the function.
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*/
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void ipfw_dyn_unlock(void);
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struct tcphdr;
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struct mbuf *ipfw_send_pkt(struct mbuf *, struct ipfw_flow_id *,
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u_int32_t, u_int32_t, int);
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int ipfw_install_state(struct ip_fw *rule, ipfw_insn_limit *cmd,
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struct ip_fw_args *args, uint32_t tablearg);
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ipfw_dyn_rule *ipfw_lookup_dyn_rule(struct ipfw_flow_id *pkt,
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int *match_direction, struct tcphdr *tcp);
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void ipfw_remove_dyn_children(struct ip_fw *rule);
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void ipfw_get_dynamic(char **bp, const char *ep);
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void ipfw_dyn_attach(void); /* uma_zcreate .... */
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void ipfw_dyn_detach(void); /* uma_zdestroy ... */
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void ipfw_dyn_init(void); /* per-vnet initialization */
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void ipfw_dyn_uninit(int); /* per-vnet deinitialization */
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int ipfw_dyn_len(void);
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/* common variables */
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VNET_DECLARE(int, fw_one_pass);
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#define V_fw_one_pass VNET(fw_one_pass)
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VNET_DECLARE(int, fw_verbose);
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#define V_fw_verbose VNET(fw_verbose)
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VNET_DECLARE(struct ip_fw_chain, layer3_chain);
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#define V_layer3_chain VNET(layer3_chain)
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VNET_DECLARE(u_int32_t, set_disable);
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#define V_set_disable VNET(set_disable)
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VNET_DECLARE(int, autoinc_step);
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#define V_autoinc_step VNET(autoinc_step)
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struct ip_fw_chain {
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struct ip_fw *rules; /* list of rules */
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struct ip_fw *reap; /* list of rules to reap */
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struct ip_fw *default_rule;
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int n_rules; /* number of static rules */
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int static_len; /* total len of static rules */
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struct ip_fw **map; /* array of rule ptrs to ease lookup */
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LIST_HEAD(nat_list, cfg_nat) nat; /* list of nat entries */
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struct radix_node_head *tables[IPFW_TABLES_MAX];
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#if defined( __linux__ ) || defined( _WIN32 )
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spinlock_t rwmtx;
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spinlock_t uh_lock;
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#else
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struct rwlock rwmtx;
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struct rwlock uh_lock; /* lock for upper half */
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#endif
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uint32_t id; /* ruleset id */
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};
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struct sockopt; /* used by tcp_var.h */
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/*
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* The lock is heavily used by ip_fw2.c (the main file) and ip_fw_nat.c
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* so the variable and the macros must be here.
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*/
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#define IPFW_LOCK_INIT(_chain) do { \
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rw_init(&(_chain)->rwmtx, "IPFW static rules"); \
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rw_init(&(_chain)->uh_lock, "IPFW UH lock"); \
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} while (0)
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#define IPFW_LOCK_DESTROY(_chain) do { \
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rw_destroy(&(_chain)->rwmtx); \
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rw_destroy(&(_chain)->uh_lock); \
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} while (0)
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#define IPFW_WLOCK_ASSERT(_chain) rw_assert(&(_chain)->rwmtx, RA_WLOCKED)
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#define IPFW_RLOCK(p) rw_rlock(&(p)->rwmtx)
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#define IPFW_RUNLOCK(p) rw_runlock(&(p)->rwmtx)
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#define IPFW_WLOCK(p) rw_wlock(&(p)->rwmtx)
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#define IPFW_WUNLOCK(p) rw_wunlock(&(p)->rwmtx)
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#define IPFW_UH_RLOCK(p) rw_rlock(&(p)->uh_lock)
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#define IPFW_UH_RUNLOCK(p) rw_runlock(&(p)->uh_lock)
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#define IPFW_UH_WLOCK(p) rw_wlock(&(p)->uh_lock)
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#define IPFW_UH_WUNLOCK(p) rw_wunlock(&(p)->uh_lock)
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/* In ip_fw_sockopt.c */
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int ipfw_find_rule(struct ip_fw_chain *chain, uint32_t key, uint32_t id);
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int ipfw_add_rule(struct ip_fw_chain *chain, struct ip_fw *input_rule);
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int ipfw_ctl(struct sockopt *sopt);
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int ipfw_chk(struct ip_fw_args *args);
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void ipfw_reap_rules(struct ip_fw *head);
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/* In ip_fw_pfil */
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int ipfw_check_hook(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir,
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struct inpcb *inp);
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/* In ip_fw_table.c */
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struct radix_node;
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int ipfw_lookup_table(struct ip_fw_chain *ch, uint16_t tbl, in_addr_t addr,
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uint32_t *val);
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int ipfw_init_tables(struct ip_fw_chain *ch);
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void ipfw_destroy_tables(struct ip_fw_chain *ch);
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int ipfw_flush_table(struct ip_fw_chain *ch, uint16_t tbl);
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int ipfw_add_table_entry(struct ip_fw_chain *ch, uint16_t tbl, in_addr_t addr,
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uint8_t mlen, uint32_t value);
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int ipfw_dump_table_entry(struct radix_node *rn, void *arg);
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int ipfw_del_table_entry(struct ip_fw_chain *ch, uint16_t tbl, in_addr_t addr,
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uint8_t mlen);
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int ipfw_count_table(struct ip_fw_chain *ch, uint32_t tbl, uint32_t *cnt);
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int ipfw_dump_table(struct ip_fw_chain *ch, ipfw_table *tbl);
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/* In ip_fw_nat.c -- XXX to be moved to ip_var.h */
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extern struct cfg_nat *(*lookup_nat_ptr)(struct nat_list *, int);
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typedef int ipfw_nat_t(struct ip_fw_args *, struct cfg_nat *, struct mbuf *);
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typedef int ipfw_nat_cfg_t(struct sockopt *);
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extern ipfw_nat_t *ipfw_nat_ptr;
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#define IPFW_NAT_LOADED (ipfw_nat_ptr != NULL)
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extern ipfw_nat_cfg_t *ipfw_nat_cfg_ptr;
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extern ipfw_nat_cfg_t *ipfw_nat_del_ptr;
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extern ipfw_nat_cfg_t *ipfw_nat_get_cfg_ptr;
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extern ipfw_nat_cfg_t *ipfw_nat_get_log_ptr;
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#endif /* _KERNEL */
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#endif /* _IPFW2_PRIVATE_H */
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