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freebsd-skq/sys/netpfil/ipfw/ip_fw_log.c
Alexander V. Chernikov 0cba2b2802 Add support for multi-field values inside ipfw tables. 
This is the last major change in given branch.

Kernel changes:
* Use 64-bytes structures to hold multi-value variables.
* Use shared array to hold values from all tables (assume
  each table algo is capable of holding 32-byte variables).
* Add some placeholders to support per-table value arrays in future.
* Use simple eventhandler-style API to ease the process of adding new
  table items. Currently table addition may required multiple UH drops/
  acquires which is quite tricky due to atomic table modificatio/swap
  support, shared array resize, etc. Deal with it by calling special
  notifier capable of rolling back state before actually performing
  swap/resize operations. Original operation then restarts itself after
  acquiring UH lock.
* Bump all objhash users default values to at least 64
* Fix custom hashing inside objhash.

Userland changes:
* Add support for dumping shared value array via "vlist" internal cmd.
* Some small print/fill_flags dixes to support u32 values.
* valtype is now bitmask of
  <skipto|pipe|fib|nat|dscp|tag|divert|netgraph|limit|ipv4|ipv6>.
  New values can hold distinct values for each of this types.
* Provide special "legacy" type which assumes all values are the same.
* More helpers/docs following..

Some examples:

3:41 [1] zfscurr0# ipfw table mimimi create valtype skipto,limit,ipv4,ipv6
3:41 [1] zfscurr0# ipfw table mimimi info
+++ table(mimimi), set(0) +++
 kindex: 2, type: addr
 references: 0, valtype: skipto,limit,ipv4,ipv6
 algorithm: addr:radix
 items: 0, size: 296
3:42 [1] zfscurr0# ipfw table mimimi add 10.0.0.5 3000,10,10.0.0.1,2a02:978:2::1
added: 10.0.0.5/32 3000,10,10.0.0.1,2a02:978:2::1
3:42 [1] zfscurr0# ipfw table mimimi list
+++ table(mimimi), set(0) +++
10.0.0.5/32 3000,0,10.0.0.1,2a02:978:2::1
2014-08-31 23:51:09 +00:00

568 lines
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/*-
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Logging support for ipfw
*/
#include "opt_ipfw.h"
#include "opt_inet.h"
#ifndef INET
#error IPFIREWALL requires INET.
#endif /* INET */
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <net/ethernet.h> /* for ETHERTYPE_IP */
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_clone.h>
#include <net/vnet.h>
#include <net/if_types.h> /* for IFT_PFLOG */
#include <net/bpf.h> /* for BPF */
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_var.h>
#include <netinet/ip_fw.h>
#include <netinet/tcp_var.h>
#include <netinet/udp.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#ifdef INET6
#include <netinet6/in6_var.h> /* ip6_sprintf() */
#endif
#include <netpfil/ipfw/ip_fw_private.h>
#ifdef MAC
#include <security/mac/mac_framework.h>
#endif
/*
* L3HDR maps an ipv4 pointer into a layer3 header pointer of type T
* Other macros just cast void * into the appropriate type
*/
#define L3HDR(T, ip) ((T *)((u_int32_t *)(ip) + (ip)->ip_hl))
#define TCP(p) ((struct tcphdr *)(p))
#define SCTP(p) ((struct sctphdr *)(p))
#define UDP(p) ((struct udphdr *)(p))
#define ICMP(p) ((struct icmphdr *)(p))
#define ICMP6(p) ((struct icmp6_hdr *)(p))
#ifdef __APPLE__
#undef snprintf
#define snprintf sprintf
#define SNPARGS(buf, len) buf + len
#define SNP(buf) buf
#else /* !__APPLE__ */
#define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
#define SNP(buf) buf, sizeof(buf)
#endif /* !__APPLE__ */
#ifdef WITHOUT_BPF
void
ipfw_log_bpf(int onoff)
{
}
#else /* !WITHOUT_BPF */
static struct ifnet *log_if; /* hook to attach to bpf */
static struct rwlock log_if_lock;
#define LOGIF_LOCK_INIT(x) rw_init(&log_if_lock, "ipfw log_if lock")
#define LOGIF_LOCK_DESTROY(x) rw_destroy(&log_if_lock)
#define LOGIF_RLOCK(x) rw_rlock(&log_if_lock)
#define LOGIF_RUNLOCK(x) rw_runlock(&log_if_lock)
#define LOGIF_WLOCK(x) rw_wlock(&log_if_lock)
#define LOGIF_WUNLOCK(x) rw_wunlock(&log_if_lock)
static const char ipfwname[] = "ipfw";
/* we use this dummy function for all ifnet callbacks */
static int
log_dummy(struct ifnet *ifp, u_long cmd, caddr_t addr)
{
return EINVAL;
}
static int
ipfw_log_output(struct ifnet *ifp, struct mbuf *m,
const struct sockaddr *dst, struct route *ro)
{
if (m != NULL)
FREE_PKT(m);
return EINVAL;
}
static void
ipfw_log_start(struct ifnet* ifp)
{
panic("ipfw_log_start() must not be called");
}
static const u_char ipfwbroadcastaddr[6] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
static int
ipfw_log_clone_match(struct if_clone *ifc, const char *name)
{
return (strncmp(name, ipfwname, sizeof(ipfwname) - 1) == 0);
}
static int
ipfw_log_clone_create(struct if_clone *ifc, char *name, size_t len,
caddr_t params)
{
int error;
int unit;
struct ifnet *ifp;
error = ifc_name2unit(name, &unit);
if (error)
return (error);
error = ifc_alloc_unit(ifc, &unit);
if (error)
return (error);
ifp = if_alloc(IFT_PFLOG);
if (ifp == NULL) {
ifc_free_unit(ifc, unit);
return (ENOSPC);
}
ifp->if_dname = ipfwname;
ifp->if_dunit = unit;
snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", ipfwname, unit);
strlcpy(name, ifp->if_xname, len);
ifp->if_mtu = 65536;
ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_init = (void *)log_dummy;
ifp->if_ioctl = log_dummy;
ifp->if_start = ipfw_log_start;
ifp->if_output = ipfw_log_output;
ifp->if_addrlen = 6;
ifp->if_hdrlen = 14;
ifp->if_broadcastaddr = ipfwbroadcastaddr;
ifp->if_baudrate = IF_Mbps(10);
LOGIF_WLOCK();
if (log_if == NULL)
log_if = ifp;
else {
LOGIF_WUNLOCK();
if_free(ifp);
ifc_free_unit(ifc, unit);
return (EEXIST);
}
LOGIF_WUNLOCK();
if_attach(ifp);
bpfattach(ifp, DLT_EN10MB, 14);
return (0);
}
static int
ipfw_log_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
{
int unit;
if (ifp == NULL)
return (0);
LOGIF_WLOCK();
if (log_if != NULL && ifp == log_if)
log_if = NULL;
else {
LOGIF_WUNLOCK();
return (EINVAL);
}
LOGIF_WUNLOCK();
unit = ifp->if_dunit;
bpfdetach(ifp);
if_detach(ifp);
if_free(ifp);
ifc_free_unit(ifc, unit);
return (0);
}
static struct if_clone *ipfw_log_cloner;
void
ipfw_log_bpf(int onoff)
{
if (onoff) {
LOGIF_LOCK_INIT();
ipfw_log_cloner = if_clone_advanced(ipfwname, 0,
ipfw_log_clone_match, ipfw_log_clone_create,
ipfw_log_clone_destroy);
} else {
if_clone_detach(ipfw_log_cloner);
LOGIF_LOCK_DESTROY();
}
}
#endif /* !WITHOUT_BPF */
#define TARG(k, f) IP_FW_ARG_TABLEARG(chain, k, f)
/*
* We enter here when we have a rule with O_LOG.
* XXX this function alone takes about 2Kbytes of code!
*/
void
ipfw_log(struct ip_fw_chain *chain, 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)
{
char *action;
int limit_reached = 0;
char action2[92], proto[128], fragment[32];
if (V_fw_verbose == 0) {
#ifndef WITHOUT_BPF
LOGIF_RLOCK();
if (log_if == NULL || log_if->if_bpf == NULL) {
LOGIF_RUNLOCK();
return;
}
if (args->eh) /* layer2, use orig hdr */
BPF_MTAP2(log_if, args->eh, ETHER_HDR_LEN, m);
else {
/* Add fake header. Later we will store
* more info in the header.
*/
if (ip->ip_v == 4)
BPF_MTAP2(log_if, "DDDDDDSSSSSS\x08\x00", ETHER_HDR_LEN, m);
else if (ip->ip_v == 6)
BPF_MTAP2(log_if, "DDDDDDSSSSSS\x86\xdd", ETHER_HDR_LEN, m);
else
/* Obviously bogus EtherType. */
BPF_MTAP2(log_if, "DDDDDDSSSSSS\xff\xff", ETHER_HDR_LEN, m);
}
LOGIF_RUNLOCK();
#endif /* !WITHOUT_BPF */
return;
}
/* the old 'log' function */
fragment[0] = '\0';
proto[0] = '\0';
if (f == NULL) { /* bogus pkt */
if (V_verbose_limit != 0 && V_norule_counter >= V_verbose_limit)
return;
V_norule_counter++;
if (V_norule_counter == V_verbose_limit)
limit_reached = V_verbose_limit;
action = "Refuse";
} else { /* O_LOG is the first action, find the real one */
ipfw_insn *cmd = ACTION_PTR(f);
ipfw_insn_log *l = (ipfw_insn_log *)cmd;
if (l->max_log != 0 && l->log_left == 0)
return;
l->log_left--;
if (l->log_left == 0)
limit_reached = l->max_log;
cmd += F_LEN(cmd); /* point to first action */
if (cmd->opcode == O_ALTQ) {
ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd;
snprintf(SNPARGS(action2, 0), "Altq %d",
altq->qid);
cmd += F_LEN(cmd);
}
if (cmd->opcode == O_PROB || cmd->opcode == O_TAG ||
cmd->opcode == O_SETDSCP)
cmd += F_LEN(cmd);
action = action2;
switch (cmd->opcode) {
case O_DENY:
action = "Deny";
break;
case O_REJECT:
if (cmd->arg1==ICMP_REJECT_RST)
action = "Reset";
else if (cmd->arg1==ICMP_UNREACH_HOST)
action = "Reject";
else
snprintf(SNPARGS(action2, 0), "Unreach %d",
cmd->arg1);
break;
case O_UNREACH6:
if (cmd->arg1==ICMP6_UNREACH_RST)
action = "Reset";
else
snprintf(SNPARGS(action2, 0), "Unreach %d",
cmd->arg1);
break;
case O_ACCEPT:
action = "Accept";
break;
case O_COUNT:
action = "Count";
break;
case O_DIVERT:
snprintf(SNPARGS(action2, 0), "Divert %d",
TARG(cmd->arg1, divert));
break;
case O_TEE:
snprintf(SNPARGS(action2, 0), "Tee %d",
TARG(cmd->arg1, divert));
break;
case O_SETFIB:
snprintf(SNPARGS(action2, 0), "SetFib %d",
TARG(cmd->arg1, fib));
break;
case O_SKIPTO:
snprintf(SNPARGS(action2, 0), "SkipTo %d",
TARG(cmd->arg1, skipto));
break;
case O_PIPE:
snprintf(SNPARGS(action2, 0), "Pipe %d",
TARG(cmd->arg1, pipe));
break;
case O_QUEUE:
snprintf(SNPARGS(action2, 0), "Queue %d",
TARG(cmd->arg1, pipe));
break;
case O_FORWARD_IP: {
ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd;
int len;
struct in_addr dummyaddr;
if (sa->sa.sin_addr.s_addr == INADDR_ANY)
dummyaddr.s_addr = htonl(tablearg);
else
dummyaddr.s_addr = sa->sa.sin_addr.s_addr;
len = snprintf(SNPARGS(action2, 0), "Forward to %s",
inet_ntoa(dummyaddr));
if (sa->sa.sin_port)
snprintf(SNPARGS(action2, len), ":%d",
sa->sa.sin_port);
}
break;
#ifdef INET6
case O_FORWARD_IP6: {
char buf[INET6_ADDRSTRLEN];
ipfw_insn_sa6 *sa = (ipfw_insn_sa6 *)cmd;
int len;
len = snprintf(SNPARGS(action2, 0), "Forward to [%s]",
ip6_sprintf(buf, &sa->sa.sin6_addr));
if (sa->sa.sin6_port)
snprintf(SNPARGS(action2, len), ":%u",
sa->sa.sin6_port);
}
break;
#endif
case O_NETGRAPH:
snprintf(SNPARGS(action2, 0), "Netgraph %d",
cmd->arg1);
break;
case O_NGTEE:
snprintf(SNPARGS(action2, 0), "Ngtee %d",
cmd->arg1);
break;
case O_NAT:
action = "Nat";
break;
case O_REASS:
action = "Reass";
break;
case O_CALLRETURN:
if (cmd->len & F_NOT)
action = "Return";
else
snprintf(SNPARGS(action2, 0), "Call %d",
cmd->arg1);
break;
default:
action = "UNKNOWN";
break;
}
}
if (hlen == 0) { /* non-ip */
snprintf(SNPARGS(proto, 0), "MAC");
} else {
int len;
#ifdef INET6
char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2];
#else
char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN];
#endif
struct icmphdr *icmp;
struct tcphdr *tcp;
struct udphdr *udp;
#ifdef INET6
struct ip6_hdr *ip6 = NULL;
struct icmp6_hdr *icmp6;
u_short ip6f_mf;
#endif
src[0] = '\0';
dst[0] = '\0';
#ifdef INET6
ip6f_mf = offset & IP6F_MORE_FRAG;
offset &= IP6F_OFF_MASK;
if (IS_IP6_FLOW_ID(&(args->f_id))) {
char ip6buf[INET6_ADDRSTRLEN];
snprintf(src, sizeof(src), "[%s]",
ip6_sprintf(ip6buf, &args->f_id.src_ip6));
snprintf(dst, sizeof(dst), "[%s]",
ip6_sprintf(ip6buf, &args->f_id.dst_ip6));
ip6 = (struct ip6_hdr *)ip;
tcp = (struct tcphdr *)(((char *)ip) + hlen);
udp = (struct udphdr *)(((char *)ip) + hlen);
} else
#endif
{
tcp = L3HDR(struct tcphdr, ip);
udp = L3HDR(struct udphdr, ip);
inet_ntop(AF_INET, &ip->ip_src, src, sizeof(src));
inet_ntop(AF_INET, &ip->ip_dst, dst, sizeof(dst));
}
switch (args->f_id.proto) {
case IPPROTO_TCP:
len = snprintf(SNPARGS(proto, 0), "TCP %s", src);
if (offset == 0)
snprintf(SNPARGS(proto, len), ":%d %s:%d",
ntohs(tcp->th_sport),
dst,
ntohs(tcp->th_dport));
else
snprintf(SNPARGS(proto, len), " %s", dst);
break;
case IPPROTO_UDP:
len = snprintf(SNPARGS(proto, 0), "UDP %s", src);
if (offset == 0)
snprintf(SNPARGS(proto, len), ":%d %s:%d",
ntohs(udp->uh_sport),
dst,
ntohs(udp->uh_dport));
else
snprintf(SNPARGS(proto, len), " %s", dst);
break;
case IPPROTO_ICMP:
icmp = L3HDR(struct icmphdr, ip);
if (offset == 0)
len = snprintf(SNPARGS(proto, 0),
"ICMP:%u.%u ",
icmp->icmp_type, icmp->icmp_code);
else
len = snprintf(SNPARGS(proto, 0), "ICMP ");
len += snprintf(SNPARGS(proto, len), "%s", src);
snprintf(SNPARGS(proto, len), " %s", dst);
break;
#ifdef INET6
case IPPROTO_ICMPV6:
icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen);
if (offset == 0)
len = snprintf(SNPARGS(proto, 0),
"ICMPv6:%u.%u ",
icmp6->icmp6_type, icmp6->icmp6_code);
else
len = snprintf(SNPARGS(proto, 0), "ICMPv6 ");
len += snprintf(SNPARGS(proto, len), "%s", src);
snprintf(SNPARGS(proto, len), " %s", dst);
break;
#endif
default:
len = snprintf(SNPARGS(proto, 0), "P:%d %s",
args->f_id.proto, src);
snprintf(SNPARGS(proto, len), " %s", dst);
break;
}
#ifdef INET6
if (IS_IP6_FLOW_ID(&(args->f_id))) {
if (offset & (IP6F_OFF_MASK | IP6F_MORE_FRAG))
snprintf(SNPARGS(fragment, 0),
" (frag %08x:%d@%d%s)",
args->f_id.extra,
ntohs(ip6->ip6_plen) - hlen,
ntohs(offset) << 3, ip6f_mf ? "+" : "");
} else
#endif
{
int ipoff, iplen;
ipoff = ntohs(ip->ip_off);
iplen = ntohs(ip->ip_len);
if (ipoff & (IP_MF | IP_OFFMASK))
snprintf(SNPARGS(fragment, 0),
" (frag %d:%d@%d%s)",
ntohs(ip->ip_id), iplen - (ip->ip_hl << 2),
offset << 3,
(ipoff & IP_MF) ? "+" : "");
}
}
#ifdef __FreeBSD__
if (oif || m->m_pkthdr.rcvif)
log(LOG_SECURITY | LOG_INFO,
"ipfw: %d %s %s %s via %s%s\n",
f ? f->rulenum : -1,
action, proto, oif ? "out" : "in",
oif ? oif->if_xname : m->m_pkthdr.rcvif->if_xname,
fragment);
else
#endif
log(LOG_SECURITY | LOG_INFO,
"ipfw: %d %s %s [no if info]%s\n",
f ? f->rulenum : -1,
action, proto, fragment);
if (limit_reached)
log(LOG_SECURITY | LOG_NOTICE,
"ipfw: limit %d reached on entry %d\n",
limit_reached, f ? f->rulenum : -1);
}
/* end of file */
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