kern/168190: [pf] panic when using pf and route-to (maybe: bad
fragment handling?)
Joerg Pulz
Joerg.Pulz at frm2.tum.de
Fri Jun 1 08:26:02 UTC 2012
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On Tue, 29 May 2012, Daniel Hartmeier wrote:
> On Sun, May 27, 2012 at 06:30:09PM +0000, Joerg Pulz wrote:
>
>> i've seen 12 more "pf_route: m0->m_len < sizeof(struct ip)" messages since the system is running after adding your patch, but no panic.
>> Is there another place in the code where i can add an additional check?
>
> Yes, the following patch adds more checks to pf.
Daniel,
after several days waiting for a panic since i applied your new patch, it
finally happend last night.
Below is the kgdb(1) output. I tried to print as much as possible to give
you the most informations.
Hope this helps to find the cuase of the trouble or at least to get a bit
closer.
#### kgdb.out_len
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...
Unread portion of the kernel message buffer:
panic: pf_test: 1: m->m_pkthdr.len 176, m->m_len 0
cpuid = 1
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
kdb_backtrace() at kdb_backtrace+0x37
panic() at panic+0x182
pf_test() at pf_test+0x259
pf_check_out() at pf_check_out+0x71
pfil_run_hooks() at pfil_run_hooks+0x113
ip_output() at ip_output+0x6de
ip_forward() at ip_forward+0x19e
ip_input() at ip_input+0x680
swi_net() at swi_net+0x15a
intr_event_execute_handlers() at intr_event_execute_handlers+0x66
ithread_loop() at ithread_loop+0xaf
fork_exit() at fork_exit+0x12a
fork_trampoline() at fork_trampoline+0xe
- --- trap 0, rip = 0, rsp = 0xffffff8000241d00, rbp = 0 ---
KDB: enter: panic
Dumping 588 out of 4077 MB:..3%..11%..22%..33%..41%..52%..63%..71%..82%..93%
Reading symbols from /boot/kernel/geom_mirror.ko...Reading symbols from /boot/kernel/geom_mirror.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/geom_mirror.ko
Reading symbols from /boot/kernel/ipmi.ko...Reading symbols from /boot/kernel/ipmi.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/ipmi.ko
#0 doadump (textdump=0) at pcpu.h:224
224 __asm("movq %%gs:0,%0" : "=r" (td));
(kgdb) up 10
#10 0xffffffff80326737 in pf_test (dir=2, ifp=0xfffffe0003001800,
m0=0xffffff80002418e8, eh=0x0, inp=0x0)
at /usr/src/sys/contrib/pf/net/pf.c:6725
6725 panic("pf_test: 1: m->m_pkthdr.len %d, m->m_len %d",
(kgdb) list
6720 goto done;
6721 }
6722
6723 if (m->m_pkthdr.len < sizeof(struct ip) ||
6724 m->m_len < sizeof(struct ip))
6725 panic("pf_test: 1: m->m_pkthdr.len %d, m->m_len %d",
6726 (int)m->m_pkthdr.len, (int)m->m_len);
6727
6728 #ifdef __FreeBSD__
6729 if (m->m_flags & M_SKIP_FIREWALL) {
(kgdb) p *m
$1 = {m_hdr = {mh_next = 0xfffffe01671a0700, mh_nextpkt = 0x0,
mh_data = 0xfffffe0064823774 "E", mh_len = 0, mh_flags = 66, mh_type = 1,
pad = "ÞÞÀÞ"}, M_dat = {MH = {MH_pkthdr = {rcvif = 0xfffffe0003001800,
header = 0x0, len = 176, flowid = 0, csum_flags = 768,
csum_data = 16922, tso_segsz = 0, PH_vt = {vt_vtag = 0, vt_nrecs = 0},
tags = {slh_first = 0xfffffe00644820a0}}, MH_dat = {MH_ext = {
ext_buf = 0x38200ec0045 <Address 0x38200ec0045 out of bounds>,
ext_free = 0x38200b00045, ext_arg1 = 0xd7d59754b1600478,
ext_arg2 = 0xb000004557b3bb81, ext_size = 62620,
ref_cnt = 0x1b2a8c002079b0a, ext_type = -1242365181},
MH_databuf = "E\000ì\000\202\003\000\000E\000°\000\202\003\000\000x\004`±T\227Õ×\201»³WE\000\000°\234ô\000\000\177\001\031\022\n\233\a\002À¨²\001\003\003óµ\000\000\000\000E\000\000\235&ü\000\000>\021Ñ\rÀ¨²\001\n\233\a\002\0005ÅA\000\211\203\016ñ\212\205\200\000\001\000\001\000\002\000\002ÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞ"}},
M_databuf = "\000\030\000\003\000þÿÿ\000\000\000\000\000\000\000\000°\000\000\000\000\000\000\000\000\003\000\000\032B\000\000\000\000\000\000ÞÀÞ Hd\000þÿÿE\000ì\000\202\003\000\000E\000°\000\202\003\000\000x\004`±T\227Õ×\201»³WE\000\000°\234ô\000\000\177\001\031\022\n\233\a\002À¨²\001\003\003óµ\000\000\000\000E\000\000\235&ü\000\000>\021Ñ\rÀ¨²\001\n\233\a\002\0005ÅA\000\211\203\016ñ\212\205\200\000\001\000\001\000\002\000\002ÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞÞÀÞ"...}}
(kgdb) p *ifp
$2 = {if_softc = 0xffffff80007a9000, if_l2com = 0xfffffe000300b200,
if_vnet = 0x0, if_link = {tqe_next = 0xfffffe0003002000,
tqe_prev = 0xfffffe0003003818},
if_xname = "bge0", '\0' <repeats 11 times>,
if_dname = 0xfffffe00028f0758 "bge", if_dunit = 0, if_refcount = 1,
if_addrhead = {tqh_first = 0xfffffe000300a000,
tqh_last = 0xfffffe0005a940b8}, if_pcount = 0, if_carp = 0x0,
if_bpf = 0xfffffe0005062400, if_index = 5, if_index_reserved = 0,
if_vlantrunk = 0x0, if_flags = 34819, if_capabilities = 524443,
if_capenable = 524443, if_linkmib = 0x0, if_linkmiblen = 0, if_data = {
ifi_type = 6 '\006', ifi_physical = 0 '\0', ifi_addrlen = 6 '\006',
ifi_hdrlen = 18 '\022', ifi_link_state = 2 '\002',
ifi_spare_char1 = 0 '\0', ifi_spare_char2 = 0 '\0',
ifi_datalen = 152 '\230', ifi_mtu = 1500, ifi_metric = 0,
ifi_baudrate = 1000000000, ifi_ipackets = 4678659, ifi_ierrors = 0,
ifi_opackets = 2594069, ifi_oerrors = 0, ifi_collisions = 0,
ifi_ibytes = 598927432, ifi_obytes = 2837994361, ifi_imcasts = 2432290,
ifi_omcasts = 0, ifi_iqdrops = 0, ifi_noproto = 0, ifi_hwassist = 3,
ifi_epoch = 1, ifi_lastchange = {tv_sec = 1338284854, tv_usec = 622823}},
if_multiaddrs = {tqh_first = 0xfffffe0005bdb080,
tqh_last = 0xfffffe00058ff080}, if_amcount = 0,
if_output = 0xffffffff8073d2f5 <ether_output>,
if_input = 0xffffffff8073c8cb <ether_input>,
if_start = 0xffffffff803c2b67 <bge_start>,
if_ioctl = 0xffffffff803c8d9a <bge_ioctl>,
if_init = 0xffffffff803c8d54 <bge_init>,
if_resolvemulti = 0xffffffff8073c28d <ether_resolvemulti>,
if_qflush = 0xffffffff807350b2 <if_qflush>,
if_transmit = 0xffffffff80734f7e <if_transmit>, if_reassign = 0,
if_home_vnet = 0x0, if_addr = 0xfffffe000300a000, if_llsoftc = 0x0,
if_drv_flags = 64, if_snd = {ifq_head = 0x0, ifq_tail = 0x0, ifq_len = 0,
ifq_maxlen = 511, ifq_drops = 0, ifq_mtx = {lock_object = {
lo_name = 0xfffffe0003001828 "bge0", lo_flags = 16973824, lo_data = 0,
lo_witness = 0xffffff80006cf480}, mtx_lock = 4}, ifq_drv_head = 0x0,
ifq_drv_tail = 0x0, ifq_drv_len = 0, ifq_drv_maxlen = 511, altq_type = 0,
altq_flags = 1, altq_disc = 0x0, altq_ifp = 0xfffffe0003001800,
altq_enqueue = 0, altq_dequeue = 0, altq_request = 0, altq_clfier = 0x0,
altq_classify = 0, altq_tbr = 0x0, altq_cdnr = 0x0},
if_broadcastaddr = 0xffffffff80ad06c0 "ÿÿÿÿÿÿ", if_bridge = 0x0,
if_label = 0x0, if_prefixhead = {tqh_first = 0x0,
tqh_last = 0xfffffe0003001a78}, if_afdata = {0x0, 0x0, 0xfffffe0005821a20,
0x0 <repeats 25 times>, 0xfffffe0005815940, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0}, if_afdata_initialized = 2, if_afdata_lock = {
lock_object = {lo_name = 0xffffffff80acf95a "if_afdata",
lo_flags = 69402624, lo_data = 0, lo_witness = 0xffffff80006cf400},
rw_lock = 1}, if_linktask = {ta_link = {stqe_next = 0x0}, ta_pending = 0,
ta_priority = 0, ta_func = 0xffffffff80737559 <do_link_state_change>,
ta_context = 0xfffffe0003001800}, if_addr_mtx = {lock_object = {
lo_name = 0xffffffff80ac1a20 "if_addr_mtx", lo_flags = 16973824,
lo_data = 0, lo_witness = 0xffffff80006c8b80}, mtx_lock = 4},
if_clones = {le_next = 0x0, le_prev = 0x0}, if_groups = {
tqh_first = 0xfffffe0003007b20, tqh_last = 0xfffffe0003007b28},
if_pf_kif = 0xfffffe0005888400, if_lagg = 0x0, if_description = 0x0,
if_fib = 0, if_alloctype = 6 '\006', if_cspare = "\000\000", if_ispare = {0,
0, 0, 0}, if_pspare = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}
(kgdb) p pd
$3 = {lookup = {done = 0, uid = 0, gid = 0, pid = 0}, tot_len = 0, hdr = {
tcp = 0x0, udp = 0x0, icmp = 0x0, icmp6 = 0x0, any = 0x0}, nat_rule = 0x0,
eh = 0x0, src = 0x0, dst = 0x0, sport = 0x0, dport = 0x0,
pf_mtag = 0xfffffe00644f9358, p_len = 0, ip_sum = 0x0, proto_sum = 0x0,
flags = 0, af = 0 '\0', proto = 0 '\0', tos = 0 '\0', dir = 0 '\0',
sidx = 0 '\0', didx = 0 '\0'}
(kgdb) p pf_status
$4 = {counters = {9415424, 0, 0, 0, 0, 0, 0, 0, 3464, 0, 27, 0, 0, 0, 0},
lcounters = {0, 0, 0, 0, 0, 0, 0}, fcounters = {12630228, 74172, 74158},
scounters = {0, 0, 0}, pcounters = {{{0, 0, 0}, {0, 0, 0}}, {{0, 0, 0}, {0,
0, 0}}}, bcounters = {{0, 0}, {0, 0}}, stateid = 5747889684957176252,
running = 1, states = 14, src_nodes = 0, since = 1338284855, debug = 1,
hostid = 3046117155, ifname = '\0' <repeats 15 times>,
pf_chksum = "quÎ\205<0 hº\021»¾vi\203"}
(kgdb) p pf_status.running
$5 = 1
(kgdb) up
#11 0xffffffff8032cc7b in pf_check_out (arg=)
at /usr/src/sys/contrib/pf/net/pf_ioctl.c:4184
4184 chk = pf_test(PF_OUT, ifp, m, NULL, inp);
(kgdb) list
4179 h = mtod(*m, struct ip *);
4180 HTONS(h->ip_len);
4181 HTONS(h->ip_off);
4182 }
4183 CURVNET_SET(ifp->if_vnet);
4184 chk = pf_test(PF_OUT, ifp, m, NULL, inp);
4185 CURVNET_RESTORE();
4186 if (chk && *m) {
4187 m_freem(*m);
4188 *m = NULL;
(kgdb) up
#12 0xffffffff8074adcf in pfil_run_hooks (ph=) at /usr/src/sys/net/pfil.c:89
89 rv = (*pfh->pfil_func)(pfh->pfil_arg, &m, ifp, dir,
(kgdb) list
84 KASSERT(ph->ph_nhooks >= 0, ("Pfil hook count dropped < 0"));
85 for (pfh = pfil_hook_get(dir, ph); pfh != NULL;
86 pfh = TAILQ_NEXT(pfh, pfil_link)) {
87 if (pfh->pfil_func != NULL) {
88 ASSERT_HOST_BYTE_ORDER(m);
89 rv = (*pfh->pfil_func)(pfh->pfil_arg, &m, ifp, dir,
90 inp);
91 if (rv != 0 || m == NULL)
92 break;
93 ASSERT_HOST_BYTE_ORDER(m);
(kgdb) p *pfh
$6 = {pfil_link = {tqe_next = 0x0, tqe_prev = 0xfffffe0005821b00},
pfil_func = 0xffffffff8032cc0a <pf_check_out>, pfil_arg = 0x0}
(kgdb) up
#13 0xffffffff80776b3a in ip_output (m=0xfffffe0064823700, opt=)
at /usr/src/sys/netinet/ip_output.c:512
512 error = pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_OUT, inp);
(kgdb) list
507 goto passout;
508
509 /* Run through list of hooks for output packets. */
510 odst.s_addr = ip->ip_dst.s_addr;
511 ASSERT_HOST_BYTE_ORDER(m);
512 error = pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_OUT, inp);
513 if (error != 0 || m == NULL)
514 goto done;
515
516 ip = mtod(m, struct ip *);
(kgdb) p *ip
$7 = {ip_hl = 5 '\005', ip_v = 4 '\004', ip_tos = 0 '\0', ip_len = 45056,
ip_id = 62620, ip_off = 0, ip_ttl = 127 '\177', ip_p = 1 '\001',
ip_sum = 4633, ip_src = {s_addr = 34052874}, ip_dst = {s_addr = 28485824}}
(kgdb) p flags
$8 = 1
(kgdb) p mtu
$9 = 1500
(kgdb) p *ia
$10 = {ia_ifa = {ifa_addr = 0xfffffe0005a09338,
ifa_dstaddr = 0xfffffe0005a09348, ifa_netmask = 0xfffffe0005a09358,
if_data = {ifi_type = 0 '\0', ifi_physical = 0 '\0', ifi_addrlen = 0 '\0',
ifi_hdrlen = 0 '\0', ifi_link_state = 0 '\0', ifi_spare_char1 = 0 '\0',
ifi_spare_char2 = 0 '\0', ifi_datalen = 0 '\0', ifi_mtu = 0,
ifi_metric = 0, ifi_baudrate = 0, ifi_ipackets = 4447700,
ifi_ierrors = 0, ifi_opackets = 2591860, ifi_oerrors = 0,
ifi_collisions = 0, ifi_ibytes = 608432458, ifi_obytes = 2801425920,
ifi_imcasts = 0, ifi_omcasts = 0, ifi_iqdrops = 0, ifi_noproto = 0,
ifi_hwassist = 0, ifi_epoch = 0, ifi_lastchange = {tv_sec = 0,
tv_usec = 0}}, ifa_ifp = 0xfffffe0003001800, ifa_link = {
tqe_next = 0xfffffe0005a94000, tqe_prev = 0xfffffe000300a0b8},
ifa_rtrequest = 0, ifa_flags = 5, ifa_refcnt = 6, ifa_metric = 0,
ifa_claim_addr = 0, ifa_mtx = {lock_object = {
lo_name = 0xffffffff80ad4634 "ifaddr", lo_flags = 16973824,
lo_data = 0, lo_witness = 0xffffff80006c8980}, mtx_lock = 4}},
ia_subnet = 2176561920, ia_subnetmask = 4294967040, ia_hash = {
le_next = 0x0, le_prev = 0xfffffe000587f8c8}, ia_link = {
tqe_next = 0xfffffe0005902c00, tqe_prev = 0xfffffe0005902928}, ia_addr = {
sin_len = 16 '\020', sin_family = 2 '\002', sin_port = 0, sin_addr = {
s_addr = 1471396737}, sin_zero = "\000\000\000\000\000\000\000"},
ia_dstaddr = {sin_len = 16 '\020', sin_family = 2 '\002', sin_port = 0,
sin_addr = {s_addr = 4289969025},
sin_zero = "\000\000\000\000\000\000\000"}, ia_sockmask = {
sin_len = 7 '\a', sin_family = 2 '\002', sin_port = 0, sin_addr = {
s_addr = 16777215}, sin_zero = "\000\000\000\000\000\000\000"}}
(kgdb) p *dst
$11 = {sin_len = 16 '\020', sin_family = 2 '\002', sin_port = 0, sin_addr = {
s_addr = 4273191809}, sin_zero = "\000\000\000\000\000\000\000"}
(kgdb)
#### kgdb.out_len
- --
The beginning is the most important part of the work.
-Plato
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