DragonFlyBSD

.if defined(IPFW2)

.endif

#if IPFW2 /* support for new firewall code */

#endif /* IPFW2 */

#if IPFW2

#else /* !IPFW2, old code to generate ipfw rule */

/* Build generic part of the two rules */

rule.fw_number = fwhole;

IP_FW_SETNSRCP(&rule, 1); /* Number of source ports. */

IP_FW_SETNDSTP(&rule, 1); /* Number of destination ports. */

rule.fw_flg = IP_FW_F_ACCEPT | IP_FW_F_IN | IP_FW_F_OUT;

rule.fw_prot = IPPROTO_TCP;

rule.fw_smsk.s_addr = INADDR_BROADCAST;

rule.fw_dmsk.s_addr = INADDR_BROADCAST;

/* Build and apply specific part of the rules */

rule.fw_src = GetOriginalAddress(link);

rule.fw_dst = GetDestAddress(link);

rule.fw_uar.fw_pts[0] = ntohs(GetOriginalPort(link));

rule.fw_uar.fw_pts[1] = ntohs(GetDestPort(link));

/* Skip non-bound links - XXX should not be strictly necessary,

but seems to leave hole if not done. Leak of non-bound links?

(Code should be left even if the problem is fixed - it is a

clear optimization) */

if (rule.fw_uar.fw_pts[0] != 0 && rule.fw_uar.fw_pts[1] != 0) {

r = setsockopt(fireWallFD, IPPROTO_IP, IP_FW_ADD, &rule, sizeof rule);

#ifdef DEBUG

if (r)

err(1, "alias punch inbound(1) setsockopt(IP_FW_ADD)");

#endif

rule.fw_src = GetDestAddress(link);

rule.fw_dst = GetOriginalAddress(link);

rule.fw_uar.fw_pts[0] = ntohs(GetDestPort(link));

rule.fw_uar.fw_pts[1] = ntohs(GetOriginalPort(link));

r = setsockopt(fireWallFD, IPPROTO_IP, IP_FW_ADD, &rule, sizeof rule);

#ifdef DEBUG

if (r)

err(1, "alias punch inbound(2) setsockopt(IP_FW_ADD)");

#endif

}

#endif /* !IPFW2 */

#if IPFW2

#else /* !IPFW2 */

rule.fw_number = fwhole;

while (!setsockopt(fireWallFD, IPPROTO_IP, IP_FW_DEL,

&rule, sizeof rule))

;

#endif /* !IPFW2 */

#if IPFW2

#else /* !IPFW2 */

rule.fw_number = i;

while (!setsockopt(fireWallFD, IPPROTO_IP, IP_FW_DEL, &rule, sizeof rule))

;

#endif /* !IPFW2 */

.if defined(IPFW2)

.endif

See Section

.Sx USING IPFW2 IN FreeBSD-STABLE

for instructions on how to run

.Nm ipfw2

on

.Fx

STABLE.

.Sh USING IPFW2 IN FreeBSD-STABLE

.Nm ipfw2

is standard in

.Fx

CURRENT, whereas

.Fx

STABLE still uses

.Nm ipfw1

unless the kernel is compiled with

.Cm options IPFW2 ,

and

.Nm /sbin/ipfw

and

.Nm /usr/lib/libalias

are recompiled with

.Cm -DIPFW2

and reinstalled (the same effect can be achieved by adding

.Cm IPFW2=TRUE

to

.Nm /etc/make.conf

before a buildworld).

IPFW2 opt_ipfw.h

options IPFW2

.if defined(IPFW2)

.endif

#if IPFW2

#else /* !IPFW2 */

struct dn_flow_set *fs = NULL ;

if ( (rule->fw_flg & IP_FW_F_COMMAND) == IP_FW_F_QUEUE )

#endif /* !IPFW2 */

#if IPFW2

#else

if (fs != NULL)

rule->pipe_ptr = fs;

#endif

#if IPFW2

#else

is_pipe = (fwa->rule->fw_flg & IP_FW_F_COMMAND) == IP_FW_F_PIPE;

#endif

.if defined(IPFW2)

.else

SRCS= ip_fw.c

.endif

#if IPFW2

#else /* !IPFW2, good old ipfw */

#include <sys/queue.h>

/*

* This union structure identifies an interface, either explicitly

* by name or implicitly by IP address. The flags IP_FW_F_IIFNAME

* and IP_FW_F_OIFNAME say how to interpret this structure. An

* interface unit number of -1 matches any unit number, while an

* IP address of 0.0.0.0 indicates matches any interface.

*

* The receive and transmit interfaces are only compared against the

* the packet if the corresponding bit (IP_FW_F_IIFACE or IP_FW_F_OIFACE)

* is set. Note some packets lack a receive or transmit interface

* (in which case the missing "interface" never matches).

*/

union ip_fw_if {

struct in_addr fu_via_ip; /* Specified by IP address */

struct { /* Specified by interface name */

#define FW_IFNLEN IFNAMSIZ

char name[FW_IFNLEN];

short glob;

} fu_via_if;

};

/*

* Format of an IP firewall descriptor

*

* fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order.

* fw_flg and fw_n*p are stored in host byte order (of course).

* Port numbers are stored in HOST byte order.

*/

struct ip_fw {

LIST_ENTRY(ip_fw) next; /* bidirectional list of rules */

u_int32_t fw_flg; /* Operational Flags word */

u_int64_t fw_pcnt; /* Packet counters */

u_int64_t fw_bcnt; /* Byte counters */

struct in_addr fw_src; /* Source IP address */

struct in_addr fw_dst; /* Destination IP address */

struct in_addr fw_smsk; /* Mask for source IP address */

struct in_addr fw_dmsk; /* Mask for destination address */

u_short fw_number; /* Rule number */

u_char fw_prot; /* IP protocol */

#if 1

u_char fw_nports; /* # of src/dst port in array */

#define IP_FW_GETNSRCP(rule) ((rule)->fw_nports & 0x0f)

#define IP_FW_SETNSRCP(rule, n) do { \

(rule)->fw_nports &= ~0x0f; \

(rule)->fw_nports |= (n); \

} while (0)

#define IP_FW_GETNDSTP(rule) ((rule)->fw_nports >> 4)

#define IP_FW_SETNDSTP(rule, n) do { \

(rule)->fw_nports &= ~0xf0; \

(rule)->fw_nports |= (n) << 4;\

} while (0)

#define IP_FW_HAVEPORTS(rule) ((rule)->fw_nports != 0)

#else

u_char __pad[1];

u_int _nsrcp;

u_int _ndstp;

#define IP_FW_GETNSRCP(rule) (rule)->_nsrcp

#define IP_FW_SETNSRCP(rule,n) (rule)->_nsrcp = n

#define IP_FW_GETNDSTP(rule) (rule)->_ndstp

#define IP_FW_SETNDSTP(rule,n) (rule)->_ndstp = n

#define IP_FW_HAVEPORTS(rule) ((rule)->_ndstp + (rule)->_nsrcp != 0)

#endif

#define IP_FW_MAX_PORTS 10 /* A reasonable maximum */

union {

u_short fw_pts[IP_FW_MAX_PORTS]; /* port numbers to match */

#define IP_FW_ICMPTYPES_MAX 128

#define IP_FW_ICMPTYPES_DIM (IP_FW_ICMPTYPES_MAX / (sizeof(unsigned) * 8))

unsigned fw_icmptypes[IP_FW_ICMPTYPES_DIM]; /*ICMP types bitmap*/

} fw_uar;

u_int fw_ipflg; /* IP flags word */

u_short fw_iplen; /* IP length XXX */

u_short fw_ipid; /* Identification XXX */

u_char fw_ipopt; /* IP options set */

u_char fw_ipnopt; /* IP options unset */

u_char fw_iptos; /* IP type of service set XXX */

u_char fw_ipntos; /* IP type of service unset XXX */

u_char fw_ipttl; /* IP time to live XXX */

u_char fw_ipver:4; /* IP version XXX */

u_char fw_tcpopt; /* TCP options set */

u_char fw_tcpnopt; /* TCP options unset */

u_char fw_tcpf; /* TCP flags set/unset */

u_char fw_tcpnf; /* TCP flags set/unset */

u_short fw_tcpwin; /* TCP window size XXX */

u_int32_t fw_tcpseq; /* TCP sequence XXX */

u_int32_t fw_tcpack; /* TCP acknowledgement XXX */

long timestamp; /* timestamp (tv_sec) of last match */

union ip_fw_if fw_in_if; /* Incoming interfaces */

union ip_fw_if fw_out_if; /* Outgoing interfaces */

union {

u_short fu_divert_port; /* Divert/tee port (options IPDIVERT) */

u_short fu_pipe_nr; /* queue number (option DUMMYNET) */

u_short fu_skipto_rule; /* SKIPTO command rule number */

u_short fu_reject_code; /* REJECT response code */

struct sockaddr_in fu_fwd_ip;

} fw_un;

/*

* N'of src ports and # of dst ports in ports array (dst ports

* follow src ports; max of 10 ports in all; count of 0 means

* match all ports)

*/

void *pipe_ptr; /* flow_set ptr for dummynet pipe */

void *next_rule_ptr; /* next rule in case of match */

uid_t fw_uid; /* uid to match */

gid_t fw_gid; /* gid to match */

int fw_logamount; /* amount to log */

u_int64_t fw_loghighest; /* highest number packet to log */

long dont_match_prob; /* 0x7fffffff means 1.0-always fail */

u_char dyn_type; /* type for dynamic rule */

#define DYN_KEEP_STATE 0 /* type for keep-state rules */

#define DYN_LIMIT 1 /* type for limit connection rules */

#define DYN_LIMIT_PARENT 2 /* parent entry for limit connection rules */

/*

* following two fields are used to limit number of connections

* basing on either src, srcport, dst, dstport.

*/

u_char limit_mask; /* mask type for limit rule, can

* have many.

*/

#define DYN_SRC_ADDR 0x1

#define DYN_SRC_PORT 0x2

#define DYN_DST_ADDR 0x4

#define DYN_DST_PORT 0x8

u_short conn_limit; /* # of connections for limit rule */

};

#define fw_divert_port fw_un.fu_divert_port

#define fw_skipto_rule fw_un.fu_skipto_rule

#define fw_reject_code fw_un.fu_reject_code

#define fw_pipe_nr fw_un.fu_pipe_nr

#define fw_fwd_ip fw_un.fu_fwd_ip

/*

*

* rule_ptr -------------+

* V

* [ next.le_next ]---->[ next.le_next ]---- [ next.le_next ]--->

* [ next.le_prev ]<----[ next.le_prev ]<----[ next.le_prev ]<---

* [ <ip_fw> body ] [ <ip_fw> body ] [ <ip_fw> body ]

*

*/

/*

* Flow mask/flow id for each queue.

*/

struct ipfw_flow_id {

u_int32_t dst_ip;

u_int32_t src_ip;

u_int16_t dst_port;

u_int16_t src_port;

u_int8_t proto;

u_int8_t flags; /* protocol-specific flags */

};

/*

* dynamic ipfw rule

*/

struct ipfw_dyn_rule {

struct ipfw_dyn_rule *next;

struct ipfw_flow_id id; /* (masked) flow id */

struct ip_fw *rule; /* pointer to rule */

struct ipfw_dyn_rule *parent; /* pointer to parent rule */

u_int32_t expire; /* expire time */

u_int64_t pcnt; /* packet match counters */

u_int64_t bcnt; /* byte match counters */

u_int32_t bucket; /* which bucket in hash table */

u_int32_t state; /* state of this rule (typically a

* combination of TCP flags)

*/

u_int16_t dyn_type; /* rule type */

u_int16_t count; /* refcount */

};

/*

* Values for "flags" field .

*/

#define IP_FW_F_COMMAND 0x000000ff /* Mask for type of chain entry: */

#define IP_FW_F_DENY 0x00000000 /* This is a deny rule */

#define IP_FW_F_REJECT 0x00000001 /* Deny and send a response packet */

#define IP_FW_F_ACCEPT 0x00000002 /* This is an accept rule */

#define IP_FW_F_COUNT 0x00000003 /* This is a count rule */

#define IP_FW_F_DIVERT 0x00000004 /* This is a divert rule */

#define IP_FW_F_TEE 0x00000005 /* This is a tee rule */

#define IP_FW_F_SKIPTO 0x00000006 /* This is a skipto rule */

#define IP_FW_F_FWD 0x00000007 /* This is a "change forwarding

* address" rule

*/

#define IP_FW_F_PIPE 0x00000008 /* This is a dummynet rule */

#define IP_FW_F_QUEUE 0x00000009 /* This is a dummynet queue */

#define IP_FW_F_IN 0x00000100 /* Check inbound packets */

#define IP_FW_F_OUT 0x00000200 /* Check outbound packets */

#define IP_FW_F_IIFACE 0x00000400 /* Apply inbound interface test */

#define IP_FW_F_OIFACE 0x00000800 /* Apply outbound interface test */

#define IP_FW_F_PRN 0x00001000 /* Print if this rule matches */

#define IP_FW_F_SRNG 0x00002000 /* The first two src ports are a min

* and max range (stored in host byte

* order).

*/

#define IP_FW_F_DRNG 0x00004000 /* The first two dst ports are a min

* and max range (stored in host byte

* order).

*/

#define IP_FW_F_FRAG 0x00008000 /* Fragment */

#define IP_FW_F_IIFNAME 0x00010000 /* In interface by name/unit (not IP) */

#define IP_FW_F_OIFNAME 0x00020000 /* Out interface by name/unit (not IP)*/

#define IP_FW_F_INVSRC 0x00040000 /* Invert sense of src check */

#define IP_FW_F_INVDST 0x00080000 /* Invert sense of dst check */

#define IP_FW_F_ICMPBIT 0x00100000 /* ICMP type bitmap is valid */

#define IP_FW_F_UID 0x00200000 /* filter by uid */

#define IP_FW_F_GID 0x00400000 /* filter by gid */

#define IP_FW_F_RND_MATCH 0x00800000 /* probabilistic rule match */

#define IP_FW_F_SMSK 0x01000000 /* src-port + mask */

#define IP_FW_F_DMSK 0x02000000 /* dst-port + mask */

#define IP_FW_UNUSED0 0x04000000

#define IP_FW_F_KEEP_S 0x08000000 /* keep state */

#define IP_FW_F_CHECK_S 0x10000000 /* check state */

#define IP_FW_F_SME 0x20000000 /* source = me */

#define IP_FW_F_DME 0x40000000 /* destination = me */

#define IP_FW_F_MASK 0x7FFFFFFF /* All possible flag bits mask */

/*

* Flags for the 'fw_ipflg' field, for comparing values

* of ip and its protocols. Not all are currently used,

* IP_FW_IF_*MSK list the one actually used.

*/

#define IP_FW_IF_TCPOPT 0x00000001 /* tcp options */

#define IP_FW_IF_TCPFLG 0x00000002 /* tcp flags */

#define IP_FW_IF_TCPSEQ 0x00000004 /* tcp sequence number */

#define IP_FW_IF_TCPACK 0x00000008 /* tcp acknowledgement number */

#define IP_FW_IF_TCPWIN 0x00000010 /* tcp window size */

#define IP_FW_IF_TCPEST 0x00000020 /* established TCP connection */

#define IP_FW_IF_TCPMSK 0x00000020 /* mask of all tcp values */

#define IP_FW_IF_IPOPT 0x00000100 /* ip options */

#define IP_FW_IF_IPLEN 0x00000200 /* ip length */

#define IP_FW_IF_IPID 0x00000400 /* ip identification */

#define IP_FW_IF_IPTOS 0x00000800 /* ip type of service */

#define IP_FW_IF_IPTTL 0x00001000 /* ip time to live */

#define IP_FW_IF_IPVER 0x00002000 /* ip version */

#define IP_FW_IF_IPMSK 0x00000000 /* mask of all ip values */

#define IP_FW_IF_MSK 0x00000020 /* All possible bits mask */

/*

* For backwards compatibility with rules specifying "via iface" but

* not restricted to only "in" or "out" packets, we define this combination

* of bits to represent this configuration.

*/

#define IF_FW_F_VIAHACK (IP_FW_F_IN|IP_FW_F_OUT|IP_FW_F_IIFACE|IP_FW_F_OIFACE)

/*

* Definitions for REJECT response codes.

* Values less than 256 correspond to ICMP unreachable codes.

*/

#define IP_FW_REJECT_RST 0x0100 /* TCP packets: send RST */

/*

* Definitions for IP option names.

*/

#define IP_FW_IPOPT_LSRR 0x01

#define IP_FW_IPOPT_SSRR 0x02

#define IP_FW_IPOPT_RR 0x04

#define IP_FW_IPOPT_TS 0x08

/*

* Definitions for TCP option names.

*/

#define IP_FW_TCPOPT_MSS 0x01

#define IP_FW_TCPOPT_WINDOW 0x02

#define IP_FW_TCPOPT_SACK 0x04

#define IP_FW_TCPOPT_TS 0x08

#define IP_FW_TCPOPT_CC 0x10

/*

* Definitions for TCP flags.

*/

#define IP_FW_TCPF_FIN TH_FIN

#define IP_FW_TCPF_SYN TH_SYN

#define IP_FW_TCPF_RST TH_RST

#define IP_FW_TCPF_PSH TH_PUSH

#define IP_FW_TCPF_ACK TH_ACK

#define IP_FW_TCPF_URG TH_URG

/*

* Main firewall chains definitions and global var's definitions.

*/

#ifdef _KERNEL

#define IP_FW_PORT_DYNT_FLAG 0x10000

#define IP_FW_PORT_TEE_FLAG 0x20000

#define IP_FW_PORT_DENY_FLAG 0x40000

/*

* 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 */

struct ip_fw *rule; /* matching rule */

struct ether_header *eh; /* for bridged packets */

struct route *ro; /* for dummynet */

struct sockaddr_in *dst; /* for dummynet */

int flags; /* for dummynet */

struct ipfw_flow_id f_id; /* grabbed from IP header */

u_int32_t retval;

};

/*

* Function definitions.

*/

void ip_fw_init (void);

/* Firewall hooks */

struct sockopt;

struct dn_flow_set;

void flush_pipe_ptrs(struct dn_flow_set *match); /* used by dummynet */

typedef int ip_fw_chk_t (struct ip_fw_args *args);

typedef int ip_fw_ctl_t (struct sockopt *);

extern ip_fw_chk_t *ip_fw_chk_ptr;

extern ip_fw_ctl_t *ip_fw_ctl_ptr;

extern int fw_one_pass;

extern int fw_enable;

extern struct ipfw_flow_id last_pkt;

#define IPFW_LOADED (ip_fw_chk_ptr != NULL)

#endif /* _KERNEL */

#endif /* !IPFW2 */

#if IPFW2

#endif /* IPFW2 */