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Add support to IPFW for classification based on "diverted" status

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(that is, input via a divert socket).
This commit is contained in:
Brian Feldman 2004-10-03 00:26:35 +00:00
parent 5599f1b52b
commit 6daf7ebd28
4 changed files with 77 additions and 16 deletions
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35
sbin/ipfw/ipfw2.c
View File

@ -217,6 +217,9 @@ enum tokens {
TOK_KEEPSTATE,
TOK_LAYER2,
TOK_OUT,
TOK_DIVERTED,
TOK_DIVERTEDLOOPBACK,
TOK_DIVERTEDOUTPUT,
TOK_XMIT,
TOK_RECV,
TOK_VIA,
@ -325,6 +328,9 @@ struct _s_x rule_options[] = {
{ "bridged", TOK_LAYER2 },
{ "layer2", TOK_LAYER2 },
{ "out", TOK_OUT },
{ "diverted", TOK_DIVERTED },
{ "diverted-loopback", TOK_DIVERTEDLOOPBACK },
{ "diverted-output", TOK_DIVERTEDOUTPUT },
{ "xmit", TOK_XMIT },
{ "recv", TOK_RECV },
{ "via", TOK_VIA },
@ -1302,6 +1308,23 @@ show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
printf(cmd->len & F_NOT ? " out" : " in");
break;
case O_DIVERTED:
switch (cmd->arg1) {
case 3:
printf(" diverted");
break;
case 1:
printf(" diverted-loopback");
break;
case 2:
printf(" diverted-output");
break;
default:
printf(" diverted-?<%u>", cmd->arg1);
break;
}
break;
case O_LAYER2:
printf(" layer2");
break;
@ -3360,6 +3383,18 @@ add(int ac, char *av[])
fill_cmd(cmd, O_IN, 0, 0);
break;
case TOK_DIVERTED:
fill_cmd(cmd, O_DIVERTED, 0, 3);
break;
case TOK_DIVERTEDLOOPBACK:
fill_cmd(cmd, O_DIVERTED, 0, 1);
break;
case TOK_DIVERTEDOUTPUT:
fill_cmd(cmd, O_DIVERTED, 0, 2);
break;
case TOK_FRAG:
fill_cmd(cmd, O_FRAG, 0, 0);
break;

28
sys/netinet/ip_divert.c
View File

@ -66,6 +66,7 @@
#include <netinet/ip.h>
#include <netinet/ip_divert.h>
#include <netinet/ip_var.h>
#include <netinet/ip_fw.h>
/*
* Divert sockets
@ -268,6 +269,8 @@ static int
div_output(struct socket *so, struct mbuf *m,
struct sockaddr_in *sin, struct mbuf *control)
{
struct m_tag *mtag;
struct divert_tag *dt;
int error = 0;
KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null"));
@ -275,23 +278,22 @@ div_output(struct socket *so, struct mbuf *m,
if (control)
m_freem(control); /* XXX */
mtag = m_tag_get(PACKET_TAG_DIVERT,
sizeof(struct divert_tag), M_NOWAIT);
if (mtag == NULL) {
error = ENOBUFS;
goto cantsend;
}
dt = (struct divert_tag *)(mtag+1);
dt->info = 0;
dt->cookie = 0;
m_tag_prepend(m, mtag);
/* Loopback avoidance and state recovery */
if (sin) {
struct m_tag *mtag;
struct divert_tag *dt;
int i;
mtag = m_tag_get(PACKET_TAG_DIVERT,
sizeof(struct divert_tag), M_NOWAIT);
if (mtag == NULL) {
error = ENOBUFS;
goto cantsend;
}
dt = (struct divert_tag *)(mtag+1);
dt->info = 0;
dt->cookie = sin->sin_port;
m_tag_prepend(m, mtag);
/*
* Find receive interface with the given name, stuffed
* (if it exists) in the sin_zero[] field.
@ -309,6 +311,7 @@ div_output(struct socket *so, struct mbuf *m,
struct ip *const ip = mtod(m, struct ip *);
struct inpcb *inp;
dt->info |= IP_FW_DIVERT_OUTPUT_FLAG;
INP_INFO_WLOCK(&divcbinfo);
inp = sotoinpcb(so);
INP_LOCK(inp);
@ -341,6 +344,7 @@ div_output(struct socket *so, struct mbuf *m,
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&divcbinfo);
} else {
dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG;
if (m->m_pkthdr.rcvif == NULL) {
/*
* No luck with the name, check by IP address.

9
sys/netinet/ip_fw.h
View File

@ -135,6 +135,7 @@ enum ipfw_opcodes { /* arguments (4 byte each) */
O_ANTISPOOF, /* none */
O_JAIL, /* u32 = id */
O_ALTQ, /* u32 = altq classif. qid */
O_DIVERTED, /* arg1=bitmap (1:loop, 2:out) */
O_LAST_OPCODE /* not an opcode! */
};
@ -415,9 +416,11 @@ typedef struct _ipfw_table {
*/
#ifdef _KERNEL
#define IP_FW_PORT_DYNT_FLAG 0x10000
#define IP_FW_PORT_TEE_FLAG 0x20000
#define IP_FW_PORT_DENY_FLAG 0x40000
#define IP_FW_PORT_DYNT_FLAG 0x00010000
#define IP_FW_PORT_TEE_FLAG 0x00020000
#define IP_FW_PORT_DENY_FLAG 0x00040000
#define IP_FW_DIVERT_LOOPBACK_FLAG 0x00080000
#define IP_FW_DIVERT_OUTPUT_FLAG 0x00100000
/*
* Arguments for calling ipfw_chk() and dummynet_io(). We put them

21
sys/netinet/ip_fw2.c
View File

@ -1717,6 +1717,14 @@ ipfw_chk(struct ip_fw_args *args)
struct ip_fw_ugid fw_ugid_cache;
int ugid_lookup = 0;
/*
* divinput_flags If non-zero, set to the IP_FW_DIVERT_*_FLAG
* associated with a packet input on a divert socket. This
* will allow to distinguish traffic and its direction when
* it originates from a divert socket.
*/
u_int divinput_flags = 0;
/*
* oif | args->oif If NULL, ipfw_chk has been called on the
* inbound path (ether_input, bdg_forward, ip_input).
@ -1893,8 +1901,11 @@ ipfw_chk(struct ip_fw_args *args)
}
}
/* reset divert rule to avoid confusion later */
if (mtag)
if (mtag) {
divinput_flags = divert_info(mtag) &
(IP_FW_DIVERT_OUTPUT_FLAG | IP_FW_DIVERT_LOOPBACK_FLAG);
m_tag_delete(m, mtag);
}
/*
* Now scan the rules, and parse microinstructions for each rule.
@ -2027,6 +2038,13 @@ ipfw_chk(struct ip_fw_args *args)
match = (args->eh != NULL);
break;
case O_DIVERTED:
match = (cmd->arg1 & 1 && divinput_flags &
IP_FW_DIVERT_LOOPBACK_FLAG) ||
(cmd->arg1 & 2 && divinput_flags &
IP_FW_DIVERT_OUTPUT_FLAG);
break;
case O_PROTO:
/*
* We do not allow an arg of 0 so the
@ -2912,6 +2930,7 @@ check_ipfw_struct(struct ip_fw *rule, int size)
case O_LAYER2:
case O_IN:
case O_FRAG:
case O_DIVERTED:
case O_IPOPT:
case O_IPTOS:
case O_IPPRECEDENCE: