f9f7bde3bc
dscp as a search key in table lookups; + (re)implement a sysctl variable to control the expire frequency of pipes and queues when they become empty; + add 'queue number' as optional part of the flow_id. This can be enabled with the command queue X config mask queue ... and makes it possible to support priority-based schedulers, where packets should be grouped according to the priority and not some fields in the 5-tuple. This is implemented as follows: - redefine a field in the ipfw_flow_id (in sys/netinet/ip_fw.h) but without changing the size or shape of the structure, so there are no ABI changes. On passing, also document how other fields are used, and remove some useless assignments in ip_fw2.c - implement small changes in the userland code to set/read the field; - revise the functions in ip_dummynet.c to manipulate masks so they also handle the additional field; There are no ABI changes in this commit.
436 lines
11 KiB
C
436 lines
11 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Logging support for ipfw
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*/
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#if !defined(KLD_MODULE)
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#include "opt_ipfw.h"
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#include "opt_ipdivert.h"
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#include "opt_ipdn.h"
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#include "opt_inet.h"
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#ifndef INET
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#error IPFIREWALL requires INET.
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#endif /* INET */
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#endif
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <net/ethernet.h> /* for ETHERTYPE_IP */
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#include <net/if.h>
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#include <net/vnet.h>
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#include <net/if_types.h> /* for IFT_ETHER */
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#include <net/bpf.h> /* for BPF */
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_fw.h>
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#include <netinet/ipfw/ip_fw_private.h>
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#include <netinet/tcp_var.h>
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#include <netinet/udp.h>
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#include <netinet/ip6.h>
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#include <netinet/icmp6.h>
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#ifdef INET6
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#include <netinet6/in6_var.h> /* ip6_sprintf() */
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#endif
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#ifdef MAC
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#include <security/mac/mac_framework.h>
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#endif
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/*
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* L3HDR maps an ipv4 pointer into a layer3 header pointer of type T
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* Other macros just cast void * into the appropriate type
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*/
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#define L3HDR(T, ip) ((T *)((u_int32_t *)(ip) + (ip)->ip_hl))
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#define TCP(p) ((struct tcphdr *)(p))
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#define SCTP(p) ((struct sctphdr *)(p))
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#define UDP(p) ((struct udphdr *)(p))
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#define ICMP(p) ((struct icmphdr *)(p))
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#define ICMP6(p) ((struct icmp6_hdr *)(p))
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#define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
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#define SNP(buf) buf, sizeof(buf)
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#ifdef WITHOUT_BPF
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void
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ipfw_log_bpf(int onoff)
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{
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}
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#else /* !WITHOUT_BPF */
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static struct ifnet *log_if; /* hook to attach to bpf */
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/* we use this dummy function for all ifnet callbacks */
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static int
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log_dummy(struct ifnet *ifp, u_long cmd, caddr_t addr)
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{
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return EINVAL;
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}
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void
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ipfw_log_bpf(int onoff)
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{
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struct ifnet *ifp;
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if (onoff) {
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if (log_if)
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return;
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ifp = if_alloc(IFT_ETHER);
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if (ifp == NULL)
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return;
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if_initname(ifp, "ipfw", 0);
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ifp->if_mtu = 65536;
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ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
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ifp->if_init = (void *)log_dummy;
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ifp->if_ioctl = log_dummy;
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ifp->if_start = (void *)log_dummy;
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ifp->if_output = (void *)log_dummy;
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ifp->if_addrlen = 6;
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ifp->if_hdrlen = 14;
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if_attach(ifp);
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ifp->if_baudrate = IF_Mbps(10);
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bpfattach(ifp, DLT_EN10MB, 14);
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log_if = ifp;
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} else {
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if (log_if) {
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ether_ifdetach(log_if);
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if_free(log_if);
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}
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log_if = NULL;
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}
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}
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#endif /* !WITHOUT_BPF */
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/*
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* We enter here when we have a rule with O_LOG.
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* XXX this function alone takes about 2Kbytes of code!
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*/
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void
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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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{
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char *action;
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int limit_reached = 0;
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char action2[40], proto[128], fragment[32];
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if (V_fw_verbose == 0) {
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#ifndef WITHOUT_BPF
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struct m_hdr mh;
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if (log_if == NULL || log_if->if_bpf == NULL)
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return;
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/* BPF treats the "mbuf" as read-only */
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mh.mh_next = m;
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mh.mh_len = ETHER_HDR_LEN;
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if (args->eh) { /* layer2, use orig hdr */
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mh.mh_data = (char *)args->eh;
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} else {
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/* add fake header. Later we will store
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* more info in the header
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*/
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mh.mh_data = "DDDDDDSSSSSS\x08\x00";
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}
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BPF_MTAP(log_if, (struct mbuf *)&mh);
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#endif /* !WITHOUT_BPF */
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return;
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}
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/* the old 'log' function */
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fragment[0] = '\0';
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proto[0] = '\0';
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if (f == NULL) { /* bogus pkt */
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if (V_verbose_limit != 0 && V_norule_counter >= V_verbose_limit)
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return;
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V_norule_counter++;
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if (V_norule_counter == V_verbose_limit)
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limit_reached = V_verbose_limit;
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action = "Refuse";
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} else { /* O_LOG is the first action, find the real one */
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ipfw_insn *cmd = ACTION_PTR(f);
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ipfw_insn_log *l = (ipfw_insn_log *)cmd;
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if (l->max_log != 0 && l->log_left == 0)
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return;
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l->log_left--;
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if (l->log_left == 0)
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limit_reached = l->max_log;
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cmd += F_LEN(cmd); /* point to first action */
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if (cmd->opcode == O_ALTQ) {
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ipfw_insn_altq *altq = (ipfw_insn_altq *)cmd;
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snprintf(SNPARGS(action2, 0), "Altq %d",
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altq->qid);
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cmd += F_LEN(cmd);
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}
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if (cmd->opcode == O_PROB)
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cmd += F_LEN(cmd);
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if (cmd->opcode == O_TAG)
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cmd += F_LEN(cmd);
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action = action2;
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switch (cmd->opcode) {
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case O_DENY:
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action = "Deny";
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break;
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case O_REJECT:
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if (cmd->arg1==ICMP_REJECT_RST)
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action = "Reset";
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else if (cmd->arg1==ICMP_UNREACH_HOST)
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action = "Reject";
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else
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snprintf(SNPARGS(action2, 0), "Unreach %d",
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cmd->arg1);
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break;
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case O_UNREACH6:
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if (cmd->arg1==ICMP6_UNREACH_RST)
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action = "Reset";
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else
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snprintf(SNPARGS(action2, 0), "Unreach %d",
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cmd->arg1);
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break;
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case O_ACCEPT:
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action = "Accept";
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break;
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case O_COUNT:
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action = "Count";
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break;
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case O_DIVERT:
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snprintf(SNPARGS(action2, 0), "Divert %d",
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cmd->arg1);
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break;
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case O_TEE:
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snprintf(SNPARGS(action2, 0), "Tee %d",
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cmd->arg1);
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break;
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case O_SETFIB:
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snprintf(SNPARGS(action2, 0), "SetFib %d",
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cmd->arg1);
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break;
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case O_SKIPTO:
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snprintf(SNPARGS(action2, 0), "SkipTo %d",
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cmd->arg1);
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break;
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case O_PIPE:
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snprintf(SNPARGS(action2, 0), "Pipe %d",
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cmd->arg1);
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break;
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case O_QUEUE:
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snprintf(SNPARGS(action2, 0), "Queue %d",
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cmd->arg1);
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break;
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case O_FORWARD_IP: {
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ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd;
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int len;
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struct in_addr dummyaddr;
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if (sa->sa.sin_addr.s_addr == INADDR_ANY)
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dummyaddr.s_addr = htonl(tablearg);
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else
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dummyaddr.s_addr = sa->sa.sin_addr.s_addr;
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len = snprintf(SNPARGS(action2, 0), "Forward to %s",
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inet_ntoa(dummyaddr));
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if (sa->sa.sin_port)
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snprintf(SNPARGS(action2, len), ":%d",
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sa->sa.sin_port);
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}
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break;
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case O_NETGRAPH:
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snprintf(SNPARGS(action2, 0), "Netgraph %d",
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cmd->arg1);
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break;
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case O_NGTEE:
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snprintf(SNPARGS(action2, 0), "Ngtee %d",
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cmd->arg1);
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break;
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case O_NAT:
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action = "Nat";
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break;
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case O_REASS:
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action = "Reass";
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break;
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default:
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action = "UNKNOWN";
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break;
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}
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}
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if (hlen == 0) { /* non-ip */
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snprintf(SNPARGS(proto, 0), "MAC");
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} else {
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int len;
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#ifdef INET6
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char src[INET6_ADDRSTRLEN + 2], dst[INET6_ADDRSTRLEN + 2];
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#else
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char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN];
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#endif
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struct icmphdr *icmp;
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struct tcphdr *tcp;
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struct udphdr *udp;
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#ifdef INET6
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struct ip6_hdr *ip6 = NULL;
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struct icmp6_hdr *icmp6;
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#endif
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src[0] = '\0';
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dst[0] = '\0';
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#ifdef INET6
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if (IS_IP6_FLOW_ID(&(args->f_id))) {
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char ip6buf[INET6_ADDRSTRLEN];
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snprintf(src, sizeof(src), "[%s]",
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ip6_sprintf(ip6buf, &args->f_id.src_ip6));
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snprintf(dst, sizeof(dst), "[%s]",
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ip6_sprintf(ip6buf, &args->f_id.dst_ip6));
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ip6 = (struct ip6_hdr *)ip;
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tcp = (struct tcphdr *)(((char *)ip) + hlen);
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udp = (struct udphdr *)(((char *)ip) + hlen);
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} else
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#endif
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{
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tcp = L3HDR(struct tcphdr, ip);
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udp = L3HDR(struct udphdr, ip);
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inet_ntoa_r(ip->ip_src, src);
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inet_ntoa_r(ip->ip_dst, dst);
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}
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switch (args->f_id.proto) {
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case IPPROTO_TCP:
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len = snprintf(SNPARGS(proto, 0), "TCP %s", src);
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if (offset == 0)
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snprintf(SNPARGS(proto, len), ":%d %s:%d",
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ntohs(tcp->th_sport),
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dst,
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ntohs(tcp->th_dport));
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else
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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case IPPROTO_UDP:
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len = snprintf(SNPARGS(proto, 0), "UDP %s", src);
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if (offset == 0)
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snprintf(SNPARGS(proto, len), ":%d %s:%d",
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ntohs(udp->uh_sport),
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dst,
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ntohs(udp->uh_dport));
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else
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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case IPPROTO_ICMP:
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icmp = L3HDR(struct icmphdr, ip);
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if (offset == 0)
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len = snprintf(SNPARGS(proto, 0),
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"ICMP:%u.%u ",
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icmp->icmp_type, icmp->icmp_code);
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else
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len = snprintf(SNPARGS(proto, 0), "ICMP ");
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len += snprintf(SNPARGS(proto, len), "%s", src);
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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#ifdef INET6
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case IPPROTO_ICMPV6:
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icmp6 = (struct icmp6_hdr *)(((char *)ip) + hlen);
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if (offset == 0)
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len = snprintf(SNPARGS(proto, 0),
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"ICMPv6:%u.%u ",
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icmp6->icmp6_type, icmp6->icmp6_code);
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else
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len = snprintf(SNPARGS(proto, 0), "ICMPv6 ");
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len += snprintf(SNPARGS(proto, len), "%s", src);
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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#endif
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default:
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len = snprintf(SNPARGS(proto, 0), "P:%d %s",
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args->f_id.proto, src);
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snprintf(SNPARGS(proto, len), " %s", dst);
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break;
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}
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#ifdef INET6
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if (IS_IP6_FLOW_ID(&(args->f_id))) {
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if (offset & (IP6F_OFF_MASK | IP6F_MORE_FRAG))
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snprintf(SNPARGS(fragment, 0),
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" (frag %08x:%d@%d%s)",
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args->f_id.extra,
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ntohs(ip6->ip6_plen) - hlen,
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ntohs(offset & IP6F_OFF_MASK) << 3,
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(offset & IP6F_MORE_FRAG) ? "+" : "");
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} else
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#endif
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{
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int ipoff, iplen;
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ipoff = ntohs(ip->ip_off);
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iplen = ntohs(ip->ip_len);
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if (ipoff & (IP_MF | IP_OFFMASK))
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snprintf(SNPARGS(fragment, 0),
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" (frag %d:%d@%d%s)",
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ntohs(ip->ip_id), iplen - (ip->ip_hl << 2),
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offset << 3,
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(ipoff & IP_MF) ? "+" : "");
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}
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}
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#ifdef __FreeBSD__
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if (oif || m->m_pkthdr.rcvif)
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log(LOG_SECURITY | LOG_INFO,
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"ipfw: %d %s %s %s via %s%s\n",
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f ? f->rulenum : -1,
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action, proto, oif ? "out" : "in",
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oif ? oif->if_xname : m->m_pkthdr.rcvif->if_xname,
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fragment);
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else
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#endif
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log(LOG_SECURITY | LOG_INFO,
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"ipfw: %d %s %s [no if info]%s\n",
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f ? f->rulenum : -1,
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action, proto, fragment);
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if (limit_reached)
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log(LOG_SECURITY | LOG_NOTICE,
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"ipfw: limit %d reached on entry %d\n",
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limit_reached, f ? f->rulenum : -1);
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}
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/* end of file */
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