wrong if used after adding new route - affects syslog, dhcrelay and more

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wrong if used after adding new route - affects syslog, dhcrelay and more

Remi Locherer
> Problem Description
Local originating traffic leaves the system on the wrong interface
after a more specific route was added. This is problematic for services
like dhcrelay and syslogd.

I verified this on iced this on OpenBSD 6.1 but do not know how if was with
older versions. The behaviour is still the same with current.

> Workaround:
Monitor the routing socket and restart affected services when the routing
table changes.

> How to reproduce:
mistral ~# route -n show -inet
Routing tables

Internet:
Destination        Gateway            Flags   Refs      Use   Mtu  Prio Iface
default            172.18.35.1        UGS        7      408     -    12 iwm0
224/4              127.0.0.1          URS        0     1898 32768     8 lo0  
127/8              127.0.0.1          UGRS       0        0 32768     8 lo0  
127.0.0.1          127.0.0.1          UHhl       1        4 32768     1 lo0  
172.18.35/24       172.18.35.87       UCn        1      634     -     8 iwm0
172.18.35.1        cc:4e:24:82:88:42  UHLch      1      312     -     7 iwm0
172.18.35.87       5c:e0:c5:1f:ad:c4  UHLl       0       14     -     1 iwm0
172.18.35.255      172.18.35.87       UHb        0      633     -     1 iwm0
172.30.1/24        192.168.250.18     UGS        0        0     -     8 vether0
192.168.250/24     192.168.250.1      UCn        1        0     -     4 vether0
192.168.250.1      fe:e1:ba:d0:05:e2  UHLl       0        5     -     1 vether0
192.168.250.18     fe:e1:bb:d1:a2:b9  UHLch      2       37     -     3 vether0
192.168.250.255    192.168.250.1      UHb        1      105     -     1 vether0
mistral ~#

$mistral 130 ~$ nc -u 172.30.1.1 9999
adsfsa

--> do not press ^C, keep it open to generate traffic over the same
    socket after changing routes

--> as expected traffic leaves on vether0
16:24:00.676256 rule 0/(match) match out on vether0: 192.168.250.1.28812 > 172.30.1.1.9999: udp 7

mistral ~# route del 172.30.1.0/24

--> now traffic leaves on iwm0. makes sense because of the default route.
16:24:51.078621 rule 0/(match) match out on iwm0: 192.168.250.1.28812 > 172.30.1.1.9999: udp 3

mistral ~# route add 172.30.1.0/24 192.168.250.18

--> traffic still leaves iwm0. expectations: vether0
16:28:09.440038 rule 0/(match) match out on iwm0: 192.168.250.1.28812 > 172.30.1.1.9999: udp 4


> dmesg

OpenBSD 6.2-current (GENERIC.MP) #107: Tue Jan 16 21:58:15 CET 2018
    [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8473632768 (8081MB)
avail mem = 8209895424 (7829MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xe0000 (84 entries)
bios0: vendor Dell Inc. version "A13" date 06/16/2017
bios0: Dell Inc. XPS 13 9343
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC FPDT FIDT MCFG HPET SSDT UEFI SSDT ASF! SSDT SSDT SSDT SSDT PCCT SSDT SSDT SSDT SLIC MSDM DMAR CSRT BGRT
acpi0: wakeup devices PEGP(S4) PEG0(S4) PEGP(S4) PEG1(S4) PEGP(S4) PEG2(S4) PXSX(S4) RP01(S4) PXSX(S4) RP02(S4) PXSX(S4) RP03(S4) PXSX(S4) RP04(S4) PXSX(S4) RP05(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.62 MHz
cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
cpu0: 256KB 64b/line 8-way L2 cache
acpitimer0: recalibrated TSC frequency 2194928041 Hz
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.22 MHz
cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 1 (application processor)
cpu2: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.22 MHz
cpu2: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 1, core 0, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.22 MHz
cpu3: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins
acpimadt0: bogus nmi for apid 3
acpimcfg0 at acpi0 addr 0xf8000000, bus 0-63
acpihpet0 at acpi0: 14318179 Hz
acpihpet0: recalibrated TSC frequency 2194924370 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEG0)
acpiprt2 at acpi0: bus -1 (PEG1)
acpiprt3 at acpi0: bus -1 (PEG2)
acpiprt4 at acpi0: bus 1 (RP01)
acpiprt5 at acpi0: bus -1 (RP02)
acpiprt6 at acpi0: bus -1 (RP03)
acpiprt7 at acpi0: bus 2 (RP04)
acpiprt8 at acpi0: bus -1 (RP05)
acpiprt9 at acpi0: bus -1 (RP06)
acpiprt10 at acpi0: bus -1 (RP07)
acpiprt11 at acpi0: bus -1 (RP08)
acpiec0 at acpi0
acpicpu0 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu2 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu3 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: PG00, resource for PEG0
acpipwrres1 at acpi0: PG01, resource for PEG1
acpipwrres2 at acpi0: PG02, resource for PEG2
acpitz0 at acpi0: critical temperature is 107 degC
acpipwrres3 at acpi0: FN00, resource for FAN0
acpipwrres4 at acpi0: FN01, resource for FAN1
acpipwrres5 at acpi0: FN02, resource for FAN2
acpipwrres6 at acpi0: FN03, resource for FAN3
acpipwrres7 at acpi0: FN04, resource for FAN4
acpitz1 at acpi0: critical temperature is 105 degC
acpitz2 at acpi0: critical temperature is 105 degC
"INT3F0D" at acpi0 not configured
"INT3403" at acpi0 not configured
"INT3403" at acpi0 not configured
"INT3403" at acpi0 not configured
"INT3403" at acpi0 not configured
"DLLK0665" at acpi0 not configured
"DLL0665" at acpi0 not configured
"INTL9C60" at acpi0 not configured
dwiic0 at acpi0: I2C0 addr 0xfe103000/0x1000 irq 7
iic0 at dwiic0
dwiic1 at acpi0: I2C1 addr 0xfe105000/0x1000 irq 7
iic1 at dwiic1
ihidev0 at iic1 addr 0x2c irq 39, vendor 0x6cb product 0x76ad, DLL0665
ihidev0: 14 report ids
imt0 at ihidev0: clickpad, 3 contacts
wsmouse0 at imt0 mux 0
"INT3402" at acpi0 not configured
"PNP0C14" at acpi0 not configured
acpibtn0 at acpi0: LID0
acpibtn1 at acpi0: PBTN
acpibtn2 at acpi0: SBTN
acpiac0 at acpi0: AC unit offline
acpibat0 at acpi0: BAT0 model "DELL 0DRRP56" serial 154 type LiP oem "Sanyo"
"INT340F" at acpi0 not configured
"INT3400" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: LCD_
cpu0: Enhanced SpeedStep 2494 MHz: speeds: 2201, 2200, 2100, 2000, 1800, 1700, 1600, 1500, 1300, 1200, 1100, 1000, 900, 700, 600, 500 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 5G Host" rev 0x09
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 5500" rev 0x09
drm0 at inteldrm0
inteldrm0: msi
inteldrm0: 1920x1080, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
wsdisplay0: screen 1-5 added (std, vt100 emulation)
azalia0 at pci0 dev 3 function 0 "Intel Core 5G HD Audio" rev 0x09: msi
"Intel Core 5G Thermal" rev 0x09 at pci0 dev 4 function 0 not configured
xhci0 at pci0 dev 20 function 0 "Intel 9 Series xHCI" rev 0x03: msi
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1
"Intel 9 Series MEI" rev 0x03 at pci0 dev 22 function 0 not configured
azalia1 at pci0 dev 27 function 0 "Intel 9 Series HD Audio" rev 0x03: msi
azalia1: codecs: Realtek/0x0288
audio0 at azalia1
ppb0 at pci0 dev 28 function 0 "Intel 9 Series PCIE" rev 0xe3: msi
pci1 at ppb0 bus 1
rtsx0 at pci1 dev 0 function 0 "Realtek RTS5249 Card Reader" rev 0x01: msi
sdmmc0 at rtsx0: 4-bit, dma
ppb1 at pci0 dev 28 function 3 "Intel 9 Series PCIE" rev 0xe3: msi
pci2 at ppb1 bus 2
iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 7265" rev 0x59, msi
ehci0 at pci0 dev 29 function 0 "Intel 9 Series USB" rev 0x03: apic 2 int 21
usb1 at ehci0: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
pcib0 at pci0 dev 31 function 0 "Intel 9 Series LPC" rev 0x03
ahci0 at pci0 dev 31 function 2 "Intel 9 Series AHCI" rev 0x03: msi, AHCI 1.3
ahci0: port 3: 6.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 3 lun 0: <ATA, LITEON L8H-256V2, F881> SCSI3 0/direct fixed t10.ATA_LITEON_L8H-256V2G-11_M.2_2280_256GB_TW0MGNHV5508556A4111
sd0: 244198MB, 512 bytes/sector, 500118192 sectors, thin
ichiic0 at pci0 dev 31 function 3 "Intel 9 Series SMBus" rev 0x03: apic 2 int 18
iic2 at ichiic0
pchtemp0 at pci0 dev 31 function 6 "Intel 9 Series Thermal" rev 0x03
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vmm0 at mainbus0: VMX/EPT
efifb at mainbus0 not configured
uvideo0 at uhub0 port 5 configuration 1 interface 0 "CKFEH41F301030003940 Integrated_Webcam_HD" rev 2.01/48.14 addr 2
video0 at uvideo0
uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.03 addr 2
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006> SCSI2 0/direct fixed
sd1: 143359MB, 512 bytes/sector, 293600752 sectors
root on sd1a (ff74af09a40c98e0.a) swap on sd1b dump on sd1b
iwm0: hw rev 0x210, fw ver 16.242414.0, address 5c:e0:c5:1f:ad:c4
iwm0: could not add phy context 0 (error 35)

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Re: wrong if used after adding new route - affects syslog, dhcrelay and more

Remi Locherer
On Mon, Jan 29, 2018 at 07:33:47PM +0100, Remi Locherer wrote:
> > Problem Description
> Local originating traffic leaves the system on the wrong interface
> after a more specific route was added. This is problematic for services
> like dhcrelay and syslogd.
>
> I verified this on iced this on OpenBSD 6.1 but do not know how if was with
> older versions. The behaviour is still the same with current.

What I wanted to write:
I verified this behaviour on OpenBSD 6.1, 6.2 and -current. I do not know
if it was different with older releases.

>
> > Workaround:
> Monitor the routing socket and restart affected services when the routing
> table changes.
>
> > How to reproduce:
> mistral ~# route -n show -inet
> Routing tables
>
> Internet:
> Destination        Gateway            Flags   Refs      Use   Mtu  Prio Iface
> default            172.18.35.1        UGS        7      408     -    12 iwm0
> 224/4              127.0.0.1          URS        0     1898 32768     8 lo0  
> 127/8              127.0.0.1          UGRS       0        0 32768     8 lo0  
> 127.0.0.1          127.0.0.1          UHhl       1        4 32768     1 lo0  
> 172.18.35/24       172.18.35.87       UCn        1      634     -     8 iwm0
> 172.18.35.1        cc:4e:24:82:88:42  UHLch      1      312     -     7 iwm0
> 172.18.35.87       5c:e0:c5:1f:ad:c4  UHLl       0       14     -     1 iwm0
> 172.18.35.255      172.18.35.87       UHb        0      633     -     1 iwm0
> 172.30.1/24        192.168.250.18     UGS        0        0     -     8 vether0
> 192.168.250/24     192.168.250.1      UCn        1        0     -     4 vether0
> 192.168.250.1      fe:e1:ba:d0:05:e2  UHLl       0        5     -     1 vether0
> 192.168.250.18     fe:e1:bb:d1:a2:b9  UHLch      2       37     -     3 vether0
> 192.168.250.255    192.168.250.1      UHb        1      105     -     1 vether0
> mistral ~#
>
> $mistral 130 ~$ nc -u 172.30.1.1 9999
> adsfsa
>
> --> do not press ^C, keep it open to generate traffic over the same
>     socket after changing routes
>
> --> as expected traffic leaves on vether0
> 16:24:00.676256 rule 0/(match) match out on vether0: 192.168.250.1.28812 > 172.30.1.1.9999: udp 7
>
> mistral ~# route del 172.30.1.0/24
>
> --> now traffic leaves on iwm0. makes sense because of the default route.
> 16:24:51.078621 rule 0/(match) match out on iwm0: 192.168.250.1.28812 > 172.30.1.1.9999: udp 3
>
> mistral ~# route add 172.30.1.0/24 192.168.250.18
>
> --> traffic still leaves iwm0. expectations: vether0
> 16:28:09.440038 rule 0/(match) match out on iwm0: 192.168.250.1.28812 > 172.30.1.1.9999: udp 4
>
>
> > dmesg
>
> OpenBSD 6.2-current (GENERIC.MP) #107: Tue Jan 16 21:58:15 CET 2018
>     [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> real mem = 8473632768 (8081MB)
> avail mem = 8209895424 (7829MB)
> mpath0 at root
> scsibus0 at mpath0: 256 targets
> mainbus0 at root
> bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xe0000 (84 entries)
> bios0: vendor Dell Inc. version "A13" date 06/16/2017
> bios0: Dell Inc. XPS 13 9343
> acpi0 at bios0: rev 2
> acpi0: sleep states S0 S3 S4 S5
> acpi0: tables DSDT FACP APIC FPDT FIDT MCFG HPET SSDT UEFI SSDT ASF! SSDT SSDT SSDT SSDT PCCT SSDT SSDT SSDT SLIC MSDM DMAR CSRT BGRT
> acpi0: wakeup devices PEGP(S4) PEG0(S4) PEGP(S4) PEG1(S4) PEGP(S4) PEG2(S4) PXSX(S4) RP01(S4) PXSX(S4) RP02(S4) PXSX(S4) RP03(S4) PXSX(S4) RP04(S4) PXSX(S4) RP05(S4) [...]
> acpitimer0 at acpi0: 3579545 Hz, 24 bits
> acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
> cpu0 at mainbus0: apid 0 (boot processor)
> cpu0: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.62 MHz
> cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
> cpu0: 256KB 64b/line 8-way L2 cache
> acpitimer0: recalibrated TSC frequency 2194928041 Hz
> cpu0: smt 0, core 0, package 0
> mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
> cpu0: apic clock running at 99MHz
> cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
> cpu1 at mainbus0: apid 2 (application processor)
> cpu1: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.22 MHz
> cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
> cpu1: 256KB 64b/line 8-way L2 cache
> cpu1: smt 0, core 1, package 0
> cpu2 at mainbus0: apid 1 (application processor)
> cpu2: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.22 MHz
> cpu2: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
> cpu2: 256KB 64b/line 8-way L2 cache
> cpu2: smt 1, core 0, package 0
> cpu3 at mainbus0: apid 3 (application processor)
> cpu3: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.22 MHz
> cpu3: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
> cpu3: 256KB 64b/line 8-way L2 cache
> cpu3: smt 1, core 1, package 0
> ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins
> acpimadt0: bogus nmi for apid 3
> acpimcfg0 at acpi0 addr 0xf8000000, bus 0-63
> acpihpet0 at acpi0: 14318179 Hz
> acpihpet0: recalibrated TSC frequency 2194924370 Hz
> acpiprt0 at acpi0: bus 0 (PCI0)
> acpiprt1 at acpi0: bus -1 (PEG0)
> acpiprt2 at acpi0: bus -1 (PEG1)
> acpiprt3 at acpi0: bus -1 (PEG2)
> acpiprt4 at acpi0: bus 1 (RP01)
> acpiprt5 at acpi0: bus -1 (RP02)
> acpiprt6 at acpi0: bus -1 (RP03)
> acpiprt7 at acpi0: bus 2 (RP04)
> acpiprt8 at acpi0: bus -1 (RP05)
> acpiprt9 at acpi0: bus -1 (RP06)
> acpiprt10 at acpi0: bus -1 (RP07)
> acpiprt11 at acpi0: bus -1 (RP08)
> acpiec0 at acpi0
> acpicpu0 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
> acpicpu1 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
> acpicpu2 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
> acpicpu3 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
> acpipwrres0 at acpi0: PG00, resource for PEG0
> acpipwrres1 at acpi0: PG01, resource for PEG1
> acpipwrres2 at acpi0: PG02, resource for PEG2
> acpitz0 at acpi0: critical temperature is 107 degC
> acpipwrres3 at acpi0: FN00, resource for FAN0
> acpipwrres4 at acpi0: FN01, resource for FAN1
> acpipwrres5 at acpi0: FN02, resource for FAN2
> acpipwrres6 at acpi0: FN03, resource for FAN3
> acpipwrres7 at acpi0: FN04, resource for FAN4
> acpitz1 at acpi0: critical temperature is 105 degC
> acpitz2 at acpi0: critical temperature is 105 degC
> "INT3F0D" at acpi0 not configured
> "INT3403" at acpi0 not configured
> "INT3403" at acpi0 not configured
> "INT3403" at acpi0 not configured
> "INT3403" at acpi0 not configured
> "DLLK0665" at acpi0 not configured
> "DLL0665" at acpi0 not configured
> "INTL9C60" at acpi0 not configured
> dwiic0 at acpi0: I2C0 addr 0xfe103000/0x1000 irq 7
> iic0 at dwiic0
> dwiic1 at acpi0: I2C1 addr 0xfe105000/0x1000 irq 7
> iic1 at dwiic1
> ihidev0 at iic1 addr 0x2c irq 39, vendor 0x6cb product 0x76ad, DLL0665
> ihidev0: 14 report ids
> imt0 at ihidev0: clickpad, 3 contacts
> wsmouse0 at imt0 mux 0
> "INT3402" at acpi0 not configured
> "PNP0C14" at acpi0 not configured
> acpibtn0 at acpi0: LID0
> acpibtn1 at acpi0: PBTN
> acpibtn2 at acpi0: SBTN
> acpiac0 at acpi0: AC unit offline
> acpibat0 at acpi0: BAT0 model "DELL 0DRRP56" serial 154 type LiP oem "Sanyo"
> "INT340F" at acpi0 not configured
> "INT3400" at acpi0 not configured
> "PNP0C0B" at acpi0 not configured
> "PNP0C0B" at acpi0 not configured
> "PNP0C0B" at acpi0 not configured
> "PNP0C0B" at acpi0 not configured
> "PNP0C0B" at acpi0 not configured
> acpivideo0 at acpi0: GFX0
> acpivout0 at acpivideo0: LCD_
> cpu0: Enhanced SpeedStep 2494 MHz: speeds: 2201, 2200, 2100, 2000, 1800, 1700, 1600, 1500, 1300, 1200, 1100, 1000, 900, 700, 600, 500 MHz
> pci0 at mainbus0 bus 0
> pchb0 at pci0 dev 0 function 0 "Intel Core 5G Host" rev 0x09
> inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 5500" rev 0x09
> drm0 at inteldrm0
> inteldrm0: msi
> inteldrm0: 1920x1080, 32bpp
> wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
> wsdisplay0: screen 1-5 added (std, vt100 emulation)
> azalia0 at pci0 dev 3 function 0 "Intel Core 5G HD Audio" rev 0x09: msi
> "Intel Core 5G Thermal" rev 0x09 at pci0 dev 4 function 0 not configured
> xhci0 at pci0 dev 20 function 0 "Intel 9 Series xHCI" rev 0x03: msi
> usb0 at xhci0: USB revision 3.0
> uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1
> "Intel 9 Series MEI" rev 0x03 at pci0 dev 22 function 0 not configured
> azalia1 at pci0 dev 27 function 0 "Intel 9 Series HD Audio" rev 0x03: msi
> azalia1: codecs: Realtek/0x0288
> audio0 at azalia1
> ppb0 at pci0 dev 28 function 0 "Intel 9 Series PCIE" rev 0xe3: msi
> pci1 at ppb0 bus 1
> rtsx0 at pci1 dev 0 function 0 "Realtek RTS5249 Card Reader" rev 0x01: msi
> sdmmc0 at rtsx0: 4-bit, dma
> ppb1 at pci0 dev 28 function 3 "Intel 9 Series PCIE" rev 0xe3: msi
> pci2 at ppb1 bus 2
> iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 7265" rev 0x59, msi
> ehci0 at pci0 dev 29 function 0 "Intel 9 Series USB" rev 0x03: apic 2 int 21
> usb1 at ehci0: USB revision 2.0
> uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
> pcib0 at pci0 dev 31 function 0 "Intel 9 Series LPC" rev 0x03
> ahci0 at pci0 dev 31 function 2 "Intel 9 Series AHCI" rev 0x03: msi, AHCI 1.3
> ahci0: port 3: 6.0Gb/s
> scsibus1 at ahci0: 32 targets
> sd0 at scsibus1 targ 3 lun 0: <ATA, LITEON L8H-256V2, F881> SCSI3 0/direct fixed t10.ATA_LITEON_L8H-256V2G-11_M.2_2280_256GB_TW0MGNHV5508556A4111
> sd0: 244198MB, 512 bytes/sector, 500118192 sectors, thin
> ichiic0 at pci0 dev 31 function 3 "Intel 9 Series SMBus" rev 0x03: apic 2 int 18
> iic2 at ichiic0
> pchtemp0 at pci0 dev 31 function 6 "Intel 9 Series Thermal" rev 0x03
> isa0 at pcib0
> isadma0 at isa0
> pckbc0 at isa0 port 0x60/5 irq 1 irq 12
> pckbd0 at pckbc0 (kbd slot)
> wskbd0 at pckbd0: console keyboard, using wsdisplay0
> pcppi0 at isa0 port 0x61
> spkr0 at pcppi0
> vmm0 at mainbus0: VMX/EPT
> efifb at mainbus0 not configured
> uvideo0 at uhub0 port 5 configuration 1 interface 0 "CKFEH41F301030003940 Integrated_Webcam_HD" rev 2.01/48.14 addr 2
> video0 at uvideo0
> uhub2 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.03 addr 2
> vscsi0 at root
> scsibus2 at vscsi0: 256 targets
> softraid0 at root
> scsibus3 at softraid0: 256 targets
> sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006> SCSI2 0/direct fixed
> sd1: 143359MB, 512 bytes/sector, 293600752 sectors
> root on sd1a (ff74af09a40c98e0.a) swap on sd1b dump on sd1b
> iwm0: hw rev 0x210, fw ver 16.242414.0, address 5c:e0:c5:1f:ad:c4
> iwm0: could not add phy context 0 (error 35)

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Re: wrong if used after adding new route - affects syslog, dhcrelay and more

Martin Pieuchot
On 29/01/18(Mon) 20:40, Remi Locherer wrote:

> On Mon, Jan 29, 2018 at 07:33:47PM +0100, Remi Locherer wrote:
> > > Problem Description
> > Local originating traffic leaves the system on the wrong interface
> > after a more specific route was added. This is problematic for services
> > like dhcrelay and syslogd.
> >
> > I verified this on iced this on OpenBSD 6.1 but do not know how if was with
> > older versions. The behaviour is still the same with current.
>
> What I wanted to write:
> I verified this behaviour on OpenBSD 6.1, 6.2 and -current. I do not know
> if it was different with older releases.

I believe it's the same.  When you're adding a most specific route
there's no mechanism to "invalidate" less specific routes.

What could be done when adding the new route is:

 - lookup the second most specific (default in your case).
 - insert the new route (172.30.1.0/24 in your case)
 - remove & reinsert the second most specific and its MPATH siblings.

This should make the ip_output() realize the default route it was using
is no longer valid (rt_isvalid() returns false), do a new route lookup
and fetch the newly added entry.