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freebsd-dev/sys/netpfil/ipfw/ip_fw_private.h
Boris Lytochkin fc727ad63d ipfw: add [fw]mark implementation for ipfw 
Packet Mark is an analogue to ipfw tags with O(1) lookup from mbuf while
regular tags require a single-linked list traversal.
Mark is a 32-bit number that can be looked up in a table
[with 'number' table-type], matched or compared with a number with optional
mask applied before comparison.
Having generic nature, Mark can be used in a variety of needs.
For example, it could be used as a security group: mark will hold a security
group id and represent a group of packet flows that shares same access
control policy.

Reviewed By: pauamma_gundo.com
Differential Revision: https://reviews.freebsd.org/D39555
MFC after:	1 month
2023-04-25 12:40:23 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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.
*
* $FreeBSD$
*/
#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
/*
* For platforms that do not have SYSCTL support, we wrap the
* SYSCTL_* into a function (one per file) to collect the values
* into an array at module initialization. The wrapping macros,
* SYSBEGIN() and SYSEND, are empty in the default case.
*/
#ifndef SYSBEGIN
#define SYSBEGIN(x)
#endif
#ifndef SYSEND
#define SYSEND
#endif
/* 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,
IP_FW_NAT64,
};
/*
* Structure for collecting parameters to dummynet for ip6_output forwarding
*/
struct _ip6dn_args {
struct ip6_pktopts *opt_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;
};
/*
* 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 {
uint32_t flags;
#define IPFW_ARGS_ETHER 0x00010000 /* valid ethernet header */
#define IPFW_ARGS_NH4 0x00020000 /* IPv4 next hop in hopstore */
#define IPFW_ARGS_NH6 0x00040000 /* IPv6 next hop in hopstore */
#define IPFW_ARGS_NH4PTR 0x00080000 /* IPv4 next hop in next_hop */
#define IPFW_ARGS_NH6PTR 0x00100000 /* IPv6 next hop in next_hop6 */
#define IPFW_ARGS_REF 0x00200000 /* valid ipfw_rule_ref */
#define IPFW_ARGS_IN 0x00400000 /* called on input */
#define IPFW_ARGS_OUT 0x00800000 /* called on output */
#define IPFW_ARGS_IP4 0x01000000 /* belongs to v4 ISR */
#define IPFW_ARGS_IP6 0x02000000 /* belongs to v6 ISR */
#define IPFW_ARGS_DROP 0x04000000 /* drop it (dummynet) */
#define IPFW_ARGS_LENMASK 0x0000ffff /* length of data in *mem */
#define IPFW_ARGS_LENGTH(f) ((f) & IPFW_ARGS_LENMASK)
/*
* On return, it points to the matching rule.
* On entry, rule.slot > 0 means the info is valid and
* contains 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 ifnet *ifp; /* input/output interface */
struct inpcb *inp;
union {
/*
* next_hop[6] pointers can be used to point to next hop
* stored in rule's opcode to avoid copying into hopstore.
* Also, it is expected that all 0x1-0x10 flags are mutually
* exclusive.
*/
struct sockaddr_in *next_hop;
struct sockaddr_in6 *next_hop6;
/* ipfw next hop storage */
struct sockaddr_in hopstore;
struct ip_fw_nh6 {
struct in6_addr sin6_addr;
uint32_t sin6_scope_id;
uint16_t sin6_port;
} hopstore6;
};
union {
struct mbuf *m; /* the mbuf chain */
void *mem; /* or memory pointer */
};
struct ipfw_flow_id f_id; /* grabbed from IP header */
};
MALLOC_DECLARE(M_IPFW);
/* wrapper for freeing a packet, in case we need to do more work */
#ifndef FREE_PKT
#if defined(__linux__) || defined(_WIN32)
#define FREE_PKT(m) netisr_dispatch(-1, m)
#else
#define FREE_PKT(m) m_freem(m)
#endif
#endif /* !FREE_PKT */
/*
* Function definitions.
*/
int ipfw_chk(struct ip_fw_args *args);
struct mbuf *ipfw_send_pkt(struct mbuf *, struct ipfw_flow_id *,
u_int32_t, u_int32_t, int);
int ipfw_attach_hooks(void);
void ipfw_detach_hooks(void);
#ifdef NOTYET
void ipfw_nat_destroy(void);
#endif
/* In ip_fw_log.c */
struct ip;
struct ip_fw_chain;
void ipfw_bpf_init(int);
void ipfw_bpf_uninit(int);
void ipfw_bpf_tap(u_char *, u_int);
void ipfw_bpf_mtap(struct mbuf *);
void ipfw_bpf_mtap2(void *, u_int, struct mbuf *);
void ipfw_log(struct ip_fw_chain *chain, struct ip_fw *f, u_int hlen,
struct ip_fw_args *args, 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 */
struct sockopt_data;
enum { /* result for matching dynamic rules */
MATCH_REVERSE = 0,
MATCH_FORWARD,
MATCH_NONE,
MATCH_UNKNOWN,
};
/*
* Macro to determine that we need to do or redo dynamic state lookup.
* direction == MATCH_UNKNOWN means that this is first lookup, then we need
* to do lookup.
* Otherwise check the state name, if previous lookup was for "any" name,
* this means there is no state with specific name. Thus no need to do
* lookup. If previous name was not "any", redo lookup for specific name.
*/
#define DYN_LOOKUP_NEEDED(p, cmd) \
((p)->direction == MATCH_UNKNOWN || \
((p)->kidx != 0 && (p)->kidx != (cmd)->arg1))
#define DYN_INFO_INIT(p) do { \
(p)->direction = MATCH_UNKNOWN; \
(p)->kidx = 0; \
} while (0)
struct ipfw_dyn_info {
uint16_t direction; /* match direction */
uint16_t kidx; /* state name kidx */
uint32_t hashval; /* hash value */
uint32_t version; /* bucket version */
uint32_t f_pos;
};
int ipfw_dyn_install_state(struct ip_fw_chain *chain, struct ip_fw *rule,
const ipfw_insn_limit *cmd, const struct ip_fw_args *args,
const void *ulp, int pktlen, struct ipfw_dyn_info *info,
uint32_t tablearg);
struct ip_fw *ipfw_dyn_lookup_state(const struct ip_fw_args *args,
const void *ulp, int pktlen, const ipfw_insn *cmd,
struct ipfw_dyn_info *info);
int ipfw_is_dyn_rule(struct ip_fw *rule);
void ipfw_expire_dyn_states(struct ip_fw_chain *, ipfw_range_tlv *);
void ipfw_get_dynamic(struct ip_fw_chain *chain, char **bp, const char *ep);
int ipfw_dump_states(struct ip_fw_chain *chain, struct sockopt_data *sd);
void ipfw_dyn_init(struct ip_fw_chain *); /* per-vnet initialization */
void ipfw_dyn_uninit(int); /* per-vnet deinitialization */
int ipfw_dyn_len(void);
uint32_t ipfw_dyn_get_count(uint32_t *, int *);
void ipfw_dyn_reset_eaction(struct ip_fw_chain *ch, uint16_t eaction_id,
uint16_t default_id, uint16_t instance_id);
/* 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(int, ipfw_vnet_ready);
#define V_ipfw_vnet_ready VNET(ipfw_vnet_ready)
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)
VNET_DECLARE(unsigned int, fw_tables_max);
#define V_fw_tables_max VNET(fw_tables_max)
VNET_DECLARE(unsigned int, fw_tables_sets);
#define V_fw_tables_sets VNET(fw_tables_sets)
struct tables_config;
#ifdef _KERNEL
/*
* Here we have the structure representing an ipfw rule.
*
* It starts with a general area
* followed by an array of one or more instructions, which the code
* accesses as an array of 32-bit values.
*
* Given a rule pointer r:
*
* r->cmd is the start of the first instruction.
* ACTION_PTR(r) is the start of the first action (things to do
* once a rule matched).
*/
struct ip_fw_jump_cache {
union {
struct {
uint32_t id;
uint32_t pos;
};
uint64_t raw_value;
};
};
struct ip_fw {
uint16_t act_ofs; /* offset of action in 32-bit units */
uint16_t cmd_len; /* # of 32-bit words in cmd */
uint16_t rulenum; /* rule number */
uint8_t set; /* rule set (0..31) */
uint8_t flags; /* currently unused */
counter_u64_t cntr; /* Pointer to rule counters */
struct ip_fw_jump_cache cache; /* used by jump_fast */
uint32_t timestamp; /* tv_sec of last match */
uint32_t id; /* rule id */
uint32_t refcnt; /* number of references */
struct ip_fw *next; /* linked list of deleted rules */
ipfw_insn cmd[1]; /* storage for commands */
};
#define IPFW_RULE_CNTR_SIZE (2 * sizeof(uint64_t))
#endif
struct ip_fw_chain {
struct ip_fw **map; /* array of rule ptrs to ease lookup */
uint32_t id; /* ruleset id */
int n_rules; /* number of static rules */
void *tablestate; /* runtime table info */
void *valuestate; /* runtime table value info */
int *idxmap; /* skipto array of rules */
void **srvstate; /* runtime service mappings */
#if defined( __linux__ ) || defined( _WIN32 )
spinlock_t rwmtx;
#else
struct rmlock rwmtx;
#endif
int static_len; /* total len of static rules (v0) */
uint32_t gencnt; /* NAT generation count */
LIST_HEAD(nat_list, cfg_nat) nat; /* list of nat entries */
struct ip_fw *default_rule;
struct tables_config *tblcfg; /* tables module data */
void *ifcfg; /* interface module data */
int *idxmap_back; /* standby skipto array of rules */
struct namedobj_instance *srvmap; /* cfg name->number mappings */
#if defined( __linux__ ) || defined( _WIN32 )
spinlock_t uh_lock;
#else
struct rwlock uh_lock; /* lock for upper half */
#endif
};
/* 64-byte structure representing multi-field table value */
struct table_value {
uint32_t tag; /* O_TAG/O_TAGGED */
uint32_t pipe; /* O_PIPE/O_QUEUE */
uint16_t divert; /* O_DIVERT/O_TEE */
uint16_t skipto; /* skipto, CALLRET */
uint32_t netgraph; /* O_NETGRAPH/O_NGTEE */
uint16_t fib; /* O_SETFIB */
uint16_t nat; /* O_NAT */
uint32_t mark; /* O_SETMARK/O_MARK */
uint32_t nh4;
uint8_t dscp;
uint8_t spare0;
uint16_t kidx; /* value kernel index */
/* -- 32 bytes -- */
struct in6_addr nh6;
uint32_t limit; /* O_LIMIT */
uint32_t zoneid; /* scope zone id for nh6 */
uint64_t refcnt; /* Number of references */
};
struct named_object {
TAILQ_ENTRY(named_object) nn_next; /* namehash */
TAILQ_ENTRY(named_object) nv_next; /* valuehash */
char *name; /* object name */
uint16_t etlv; /* Export TLV id */
uint8_t subtype;/* object subtype within class */
uint8_t set; /* set object belongs to */
uint16_t kidx; /* object kernel index */
uint16_t spare;
uint32_t ocnt; /* object counter for internal use */
uint32_t refcnt; /* number of references */
};
TAILQ_HEAD(namedobjects_head, named_object);
struct sockopt; /* used by tcp_var.h */
struct sockopt_data {
caddr_t kbuf; /* allocated buffer */
size_t ksize; /* given buffer size */
size_t koff; /* data already used */
size_t kavail; /* number of bytes available */
size_t ktotal; /* total bytes pushed */
struct sockopt *sopt; /* socket data */
caddr_t sopt_val; /* sopt user buffer */
size_t valsize; /* original data size */
};
struct ipfw_ifc;
typedef void (ipfw_ifc_cb)(struct ip_fw_chain *ch, void *cbdata,
uint16_t ifindex);
struct ipfw_iface {
struct named_object no;
char ifname[64];
int resolved;
uint16_t ifindex;
uint16_t spare;
uint64_t gencnt;
TAILQ_HEAD(, ipfw_ifc) consumers;
};
struct ipfw_ifc {
TAILQ_ENTRY(ipfw_ifc) next;
struct ipfw_iface *iface;
ipfw_ifc_cb *cb;
void *cbdata;
};
/* Macro for working with various counters */
#define IPFW_INC_RULE_COUNTER(_cntr, _bytes) do { \
counter_u64_add((_cntr)->cntr, 1); \
counter_u64_add((_cntr)->cntr + 1, _bytes); \
if ((_cntr)->timestamp != time_uptime) \
(_cntr)->timestamp = time_uptime; \
} while (0)
#define IPFW_INC_DYN_COUNTER(_cntr, _bytes) do { \
(_cntr)->pcnt++; \
(_cntr)->bcnt += _bytes; \
} while (0)
#define IPFW_ZERO_RULE_COUNTER(_cntr) do { \
counter_u64_zero((_cntr)->cntr); \
counter_u64_zero((_cntr)->cntr + 1); \
(_cntr)->timestamp = 0; \
} while (0)
#define IPFW_ZERO_DYN_COUNTER(_cntr) do { \
(_cntr)->pcnt = 0; \
(_cntr)->bcnt = 0; \
} while (0)
#define TARG_VAL(ch, k, f) ((struct table_value *)((ch)->valuestate))[k].f
#define IP_FW_ARG_TABLEARG(ch, a, f) \
(((a) == IP_FW_TARG) ? TARG_VAL(ch, tablearg, f) : (a))
/*
* 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.
*/
#if defined( __linux__ ) || defined( _WIN32 )
#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_RLOCK_ASSERT(_chain) rw_assert(&(_chain)->rwmtx, RA_RLOCKED)
#define IPFW_WLOCK_ASSERT(_chain) rw_assert(&(_chain)->rwmtx, RA_WLOCKED)
#define IPFW_RLOCK_TRACKER
#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_PF_RLOCK(p) IPFW_RLOCK(p)
#define IPFW_PF_RUNLOCK(p) IPFW_RUNLOCK(p)
#else /* FreeBSD */
#define IPFW_LOCK_INIT(_chain) do { \
rm_init_flags(&(_chain)->rwmtx, "IPFW static rules", RM_RECURSE); \
rw_init(&(_chain)->uh_lock, "IPFW UH lock"); \
} while (0)
#define IPFW_LOCK_DESTROY(_chain) do { \
rm_destroy(&(_chain)->rwmtx); \
rw_destroy(&(_chain)->uh_lock); \
} while (0)
#define IPFW_RLOCK_ASSERT(_chain) rm_assert(&(_chain)->rwmtx, RA_RLOCKED)
#define IPFW_WLOCK_ASSERT(_chain) rm_assert(&(_chain)->rwmtx, RA_WLOCKED)
#define IPFW_RLOCK_TRACKER struct rm_priotracker _tracker
#define IPFW_RLOCK(p) rm_rlock(&(p)->rwmtx, &_tracker)
#define IPFW_RUNLOCK(p) rm_runlock(&(p)->rwmtx, &_tracker)
#define IPFW_WLOCK(p) rm_wlock(&(p)->rwmtx)
#define IPFW_WUNLOCK(p) rm_wunlock(&(p)->rwmtx)
#define IPFW_PF_RLOCK(p) IPFW_RLOCK(p)
#define IPFW_PF_RUNLOCK(p) IPFW_RUNLOCK(p)
#endif
#define IPFW_UH_RLOCK_ASSERT(_chain) rw_assert(&(_chain)->uh_lock, RA_RLOCKED)
#define IPFW_UH_WLOCK_ASSERT(_chain) rw_assert(&(_chain)->uh_lock, RA_WLOCKED)
#define IPFW_UH_UNLOCK_ASSERT(_chain) rw_assert(&(_chain)->uh_lock, RA_UNLOCKED)
#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)
struct obj_idx {
uint16_t uidx; /* internal index supplied by userland */
uint16_t kidx; /* kernel object index */
uint16_t off; /* tlv offset from rule end in 4-byte words */
uint8_t spare;
uint8_t type; /* object type within its category */
};
struct rule_check_info {
uint16_t flags; /* rule-specific check flags */
uint16_t object_opcodes; /* num of opcodes referencing objects */
uint16_t urule_numoff; /* offset of rulenum in bytes */
uint8_t version; /* rule version */
uint8_t spare;
ipfw_obj_ctlv *ctlv; /* name TLV containter */
struct ip_fw *krule; /* resulting rule pointer */
caddr_t urule; /* original rule pointer */
struct obj_idx obuf[8]; /* table references storage */
};
/* Legacy interface support */
/*
* FreeBSD 8 export rule format
*/
struct ip_fw_rule0 {
struct ip_fw *x_next; /* linked list of rules */
struct ip_fw *next_rule; /* ptr to next [skipto] rule */
/* 'next_rule' is used to pass up 'set_disable' status */
uint16_t act_ofs; /* offset of action in 32-bit units */
uint16_t cmd_len; /* # of 32-bit words in cmd */
uint16_t rulenum; /* rule number */
uint8_t set; /* rule set (0..31) */
uint8_t _pad; /* padding */
uint32_t id; /* rule id */
/* These fields are present in all rules. */
uint64_t pcnt; /* Packet counter */
uint64_t bcnt; /* Byte counter */
uint32_t timestamp; /* tv_sec of last match */
ipfw_insn cmd[1]; /* storage for commands */
};
struct ip_fw_bcounter0 {
uint64_t pcnt; /* Packet counter */
uint64_t bcnt; /* Byte counter */
uint32_t timestamp; /* tv_sec of last match */
};
/* Kernel rule length */
/*
* RULE _K_ SIZE _V_ ->
* get kernel size from userland rool version _V_.
* RULE _U_ SIZE _V_ ->
* get user size version _V_ from kernel rule
* RULESIZE _V_ ->
* get user size rule length
*/
/* FreeBSD8 <> current kernel format */
#define RULEUSIZE0(r) (sizeof(struct ip_fw_rule0) + (r)->cmd_len * 4 - 4)
#define RULEKSIZE0(r) roundup2((sizeof(struct ip_fw) + (r)->cmd_len*4 - 4), 8)
/* FreeBSD11 <> current kernel format */
#define RULEUSIZE1(r) (roundup2(sizeof(struct ip_fw_rule) + \
(r)->cmd_len * 4 - 4, 8))
#define RULEKSIZE1(r) roundup2((sizeof(struct ip_fw) + (r)->cmd_len*4 - 4), 8)
/*
* Tables/Objects index rewriting code
*/
/* Default and maximum number of ipfw tables/objects. */
#define IPFW_TABLES_MAX 65536
#define IPFW_TABLES_DEFAULT 128
#define IPFW_OBJECTS_MAX 65536
#define IPFW_OBJECTS_DEFAULT 1024
#define CHAIN_TO_SRV(ch) ((ch)->srvmap)
#define SRV_OBJECT(ch, idx) ((ch)->srvstate[(idx)])
struct tid_info {
uint32_t set; /* table set */
uint16_t uidx; /* table index */
uint8_t type; /* table type */
uint8_t atype;
uint8_t spare;
int tlen; /* Total TLV size block */
void *tlvs; /* Pointer to first TLV */
};
/*
* Classifier callback. Checks if @cmd opcode contains kernel object reference.
* If true, returns its index and type.
* Returns 0 if match is found, 1 overwise.
*/
typedef int (ipfw_obj_rw_cl)(ipfw_insn *cmd, uint16_t *puidx, uint8_t *ptype);
/*
* Updater callback. Sets kernel object reference index to @puidx
*/
typedef void (ipfw_obj_rw_upd)(ipfw_insn *cmd, uint16_t puidx);
/*
* Finder callback. Tries to find named object by name (specified via @ti).
* Stores found named object pointer in @pno.
* If object was not found, NULL is stored.
*
* Return 0 if input data was valid.
*/
typedef int (ipfw_obj_fname_cb)(struct ip_fw_chain *ch,
struct tid_info *ti, struct named_object **pno);
/*
* Another finder callback. Tries to findex named object by kernel index.
*
* Returns pointer to named object or NULL.
*/
typedef struct named_object *(ipfw_obj_fidx_cb)(struct ip_fw_chain *ch,
uint16_t kidx);
/*
* Object creator callback. Tries to create object specified by @ti.
* Stores newly-allocated object index in @pkidx.
*
* Returns 0 on success.
*/
typedef int (ipfw_obj_create_cb)(struct ip_fw_chain *ch, struct tid_info *ti,
uint16_t *pkidx);
/*
* Object destroy callback. Intended to free resources allocated by
* create_object callback.
*/
typedef void (ipfw_obj_destroy_cb)(struct ip_fw_chain *ch,
struct named_object *no);
/*
* Sets handler callback. Handles moving and swaping set of named object.
* SWAP_ALL moves all named objects from set `set' to `new_set' and vise versa;
* TEST_ALL checks that there aren't any named object with conflicting names;
* MOVE_ALL moves all named objects from set `set' to `new_set';
* COUNT_ONE used to count number of references used by object with kidx `set';
* TEST_ONE checks that named object with kidx `set' can be moved to `new_set`;
* MOVE_ONE moves named object with kidx `set' to set `new_set'.
*/
enum ipfw_sets_cmd {
SWAP_ALL = 0, TEST_ALL, MOVE_ALL, COUNT_ONE, TEST_ONE, MOVE_ONE
};
typedef int (ipfw_obj_sets_cb)(struct ip_fw_chain *ch,
uint16_t set, uint8_t new_set, enum ipfw_sets_cmd cmd);
struct opcode_obj_rewrite {
uint32_t opcode; /* Opcode to act upon */
uint32_t etlv; /* Relevant export TLV id */
ipfw_obj_rw_cl *classifier; /* Check if rewrite is needed */
ipfw_obj_rw_upd *update; /* update cmd with new value */
ipfw_obj_fname_cb *find_byname; /* Find named object by name */
ipfw_obj_fidx_cb *find_bykidx; /* Find named object by kidx */
ipfw_obj_create_cb *create_object; /* Create named object */
ipfw_obj_destroy_cb *destroy_object;/* Destroy named object */
ipfw_obj_sets_cb *manage_sets; /* Swap or move sets */
};
#define IPFW_ADD_OBJ_REWRITER(f, c) do { \
if ((f) != 0) \
ipfw_add_obj_rewriter(c, \
sizeof(c) / sizeof(c[0])); \
} while(0)
#define IPFW_DEL_OBJ_REWRITER(l, c) do { \
if ((l) != 0) \
ipfw_del_obj_rewriter(c, \
sizeof(c) / sizeof(c[0])); \
} while(0)
/* In ip_fw_iface.c */
int ipfw_iface_init(void);
void ipfw_iface_destroy(void);
void vnet_ipfw_iface_destroy(struct ip_fw_chain *ch);
int ipfw_iface_ref(struct ip_fw_chain *ch, char *name,
struct ipfw_ifc *ic);
void ipfw_iface_unref(struct ip_fw_chain *ch, struct ipfw_ifc *ic);
void ipfw_iface_add_notify(struct ip_fw_chain *ch, struct ipfw_ifc *ic);
void ipfw_iface_del_notify(struct ip_fw_chain *ch, struct ipfw_ifc *ic);
/* In ip_fw_sockopt.c */
void ipfw_init_skipto_cache(struct ip_fw_chain *chain);
void ipfw_destroy_skipto_cache(struct ip_fw_chain *chain);
int ipfw_find_rule(struct ip_fw_chain *chain, uint32_t key, uint32_t id);
int ipfw_ctl3(struct sockopt *sopt);
int ipfw_add_protected_rule(struct ip_fw_chain *chain, struct ip_fw *rule,
int locked);
void ipfw_reap_add(struct ip_fw_chain *chain, struct ip_fw **head,
struct ip_fw *rule);
void ipfw_reap_rules(struct ip_fw *head);
void ipfw_init_counters(void);
void ipfw_destroy_counters(void);
struct ip_fw *ipfw_alloc_rule(struct ip_fw_chain *chain, size_t rulesize);
void ipfw_free_rule(struct ip_fw *rule);
int ipfw_match_range(struct ip_fw *rule, ipfw_range_tlv *rt);
int ipfw_mark_object_kidx(uint32_t *bmask, uint16_t etlv, uint16_t kidx);
ipfw_insn *ipfw_get_action(struct ip_fw *);
typedef int (sopt_handler_f)(struct ip_fw_chain *ch,
ip_fw3_opheader *op3, struct sockopt_data *sd);
struct ipfw_sopt_handler {
uint16_t opcode;
uint8_t version;
uint8_t dir;
sopt_handler_f *handler;
uint64_t refcnt;
};
#define HDIR_SET 0x01 /* Handler is used to set some data */
#define HDIR_GET 0x02 /* Handler is used to retrieve data */
#define HDIR_BOTH HDIR_GET|HDIR_SET
void ipfw_init_sopt_handler(void);
void ipfw_destroy_sopt_handler(void);
void ipfw_add_sopt_handler(struct ipfw_sopt_handler *sh, size_t count);
int ipfw_del_sopt_handler(struct ipfw_sopt_handler *sh, size_t count);
caddr_t ipfw_get_sopt_space(struct sockopt_data *sd, size_t needed);
caddr_t ipfw_get_sopt_header(struct sockopt_data *sd, size_t needed);
#define IPFW_ADD_SOPT_HANDLER(f, c) do { \
if ((f) != 0) \
ipfw_add_sopt_handler(c, \
sizeof(c) / sizeof(c[0])); \
} while(0)
#define IPFW_DEL_SOPT_HANDLER(l, c) do { \
if ((l) != 0) \
ipfw_del_sopt_handler(c, \
sizeof(c) / sizeof(c[0])); \
} while(0)
struct namedobj_instance;
typedef int (objhash_cb_t)(struct namedobj_instance *ni, struct named_object *,
void *arg);
typedef uint32_t (objhash_hash_f)(struct namedobj_instance *ni, const void *key,
uint32_t kopt);
typedef int (objhash_cmp_f)(struct named_object *no, const void *key,
uint32_t kopt);
struct namedobj_instance *ipfw_objhash_create(uint32_t items);
void ipfw_objhash_destroy(struct namedobj_instance *);
void ipfw_objhash_bitmap_alloc(uint32_t items, void **idx, int *pblocks);
void ipfw_objhash_bitmap_merge(struct namedobj_instance *ni,
void **idx, int *blocks);
void ipfw_objhash_bitmap_swap(struct namedobj_instance *ni,
void **idx, int *blocks);
void ipfw_objhash_bitmap_free(void *idx, int blocks);
void ipfw_objhash_set_hashf(struct namedobj_instance *ni, objhash_hash_f *f);
struct named_object *ipfw_objhash_lookup_name(struct namedobj_instance *ni,
uint32_t set, const char *name);
struct named_object *ipfw_objhash_lookup_name_type(struct namedobj_instance *ni,
uint32_t set, uint32_t type, const char *name);
struct named_object *ipfw_objhash_lookup_kidx(struct namedobj_instance *ni,
uint16_t idx);
int ipfw_objhash_same_name(struct namedobj_instance *ni, struct named_object *a,
struct named_object *b);
void ipfw_objhash_add(struct namedobj_instance *ni, struct named_object *no);
void ipfw_objhash_del(struct namedobj_instance *ni, struct named_object *no);
uint32_t ipfw_objhash_count(struct namedobj_instance *ni);
uint32_t ipfw_objhash_count_type(struct namedobj_instance *ni, uint16_t type);
int ipfw_objhash_foreach(struct namedobj_instance *ni, objhash_cb_t *f,
void *arg);
int ipfw_objhash_foreach_type(struct namedobj_instance *ni, objhash_cb_t *f,
void *arg, uint16_t type);
int ipfw_objhash_free_idx(struct namedobj_instance *ni, uint16_t idx);
int ipfw_objhash_alloc_idx(void *n, uint16_t *pidx);
void ipfw_objhash_set_funcs(struct namedobj_instance *ni,
objhash_hash_f *hash_f, objhash_cmp_f *cmp_f);
int ipfw_objhash_find_type(struct namedobj_instance *ni, struct tid_info *ti,
uint32_t etlv, struct named_object **pno);
void ipfw_export_obj_ntlv(struct named_object *no, ipfw_obj_ntlv *ntlv);
ipfw_obj_ntlv *ipfw_find_name_tlv_type(void *tlvs, int len, uint16_t uidx,
uint32_t etlv);
void ipfw_init_obj_rewriter(void);
void ipfw_destroy_obj_rewriter(void);
void ipfw_add_obj_rewriter(struct opcode_obj_rewrite *rw, size_t count);
int ipfw_del_obj_rewriter(struct opcode_obj_rewrite *rw, size_t count);
int create_objects_compat(struct ip_fw_chain *ch, ipfw_insn *cmd,
struct obj_idx *oib, struct obj_idx *pidx, struct tid_info *ti);
void update_opcode_kidx(ipfw_insn *cmd, uint16_t idx);
int classify_opcode_kidx(ipfw_insn *cmd, uint16_t *puidx);
void ipfw_init_srv(struct ip_fw_chain *ch);
void ipfw_destroy_srv(struct ip_fw_chain *ch);
int ipfw_check_object_name_generic(const char *name);
int ipfw_obj_manage_sets(struct namedobj_instance *ni, uint16_t type,
uint16_t set, uint8_t new_set, enum ipfw_sets_cmd cmd);
/* In ip_fw_eaction.c */
typedef int (ipfw_eaction_t)(struct ip_fw_chain *ch, struct ip_fw_args *args,
ipfw_insn *cmd, int *done);
int ipfw_eaction_init(struct ip_fw_chain *ch, int first);
void ipfw_eaction_uninit(struct ip_fw_chain *ch, int last);
uint16_t ipfw_add_eaction(struct ip_fw_chain *ch, ipfw_eaction_t handler,
const char *name);
int ipfw_del_eaction(struct ip_fw_chain *ch, uint16_t eaction_id);
int ipfw_run_eaction(struct ip_fw_chain *ch, struct ip_fw_args *args,
ipfw_insn *cmd, int *done);
int ipfw_reset_eaction(struct ip_fw_chain *ch, struct ip_fw *rule,
uint16_t eaction_id, uint16_t default_id, uint16_t instance_id);
int ipfw_reset_eaction_instance(struct ip_fw_chain *ch, uint16_t eaction_id,
uint16_t instance_id);
/* In ip_fw_table.c */
struct table_info;
typedef int (table_lookup_t)(struct table_info *ti, void *key, uint32_t keylen,
uint32_t *val);
int ipfw_lookup_table(struct ip_fw_chain *ch, uint16_t tbl, uint16_t plen,
void *paddr, uint32_t *val);
struct named_object *ipfw_objhash_lookup_table_kidx(struct ip_fw_chain *ch,
uint16_t kidx);
int ipfw_ref_table(struct ip_fw_chain *ch, ipfw_obj_ntlv *ntlv, uint16_t *kidx);
void ipfw_unref_table(struct ip_fw_chain *ch, uint16_t kidx);
int ipfw_init_tables(struct ip_fw_chain *ch, int first);
int ipfw_resize_tables(struct ip_fw_chain *ch, unsigned int ntables);
int ipfw_switch_tables_namespace(struct ip_fw_chain *ch, unsigned int nsets);
void ipfw_destroy_tables(struct ip_fw_chain *ch, int last);
/* In ip_fw_nat.c -- XXX to be moved to ip_var.h */
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 *);
VNET_DECLARE(int, ipfw_nat_ready);
#define V_ipfw_nat_ready VNET(ipfw_nat_ready)
#define IPFW_NAT_LOADED (V_ipfw_nat_ready)
extern ipfw_nat_t *ipfw_nat_ptr;
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;
/* Helper functions for IP checksum adjustment */
static __inline uint16_t
cksum_add(uint16_t sum, uint16_t a)
{
uint16_t res;
res = sum + a;
return (res + (res < a));
}
static __inline uint16_t
cksum_adjust(uint16_t oldsum, uint16_t old, uint16_t new)
{
return (~cksum_add(cksum_add(~oldsum, ~old), new));
}
#endif /* _KERNEL */
#endif /* _IPFW2_PRIVATE_H */
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