Messages in this thread | | | Date | Mon, 28 May 2007 22:13:04 +0100 | From | Simon Arlott <> | Subject | "[IPV6]: Fix routing round-robin locking." breaks manual default route (bug 8349) |
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Initial state - address, no routes: # ip -6 a 2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qlen 1000 inet6 2001:4b10:1005:0:202:44ff:fe50:91af/64 scope global valid_lft forever preferred_lft forever inet6 fe80::202:44ff:fe50:91af/64 scope link valid_lft forever preferred_lft forever # ip -6 r fe80::/64 dev eth0 metric 256 expires 21332290sec mtu 1500 advmss 1440 ff00::/8 dev eth0 metric 256 expires 21332290sec mtu 1500 advmss 1440 unreachable default dev lo proto none metric -1 error -101 # ping6 -c 1 2001:4b10:1005:0:205:b4ff:fe12:530 connect: Network is unreachable
Adding a 2000::/3 route works: # ip -6 r a 2000::/3 via fe80::230:18ff:feb0:25c2 dev eth0 # ping6 -c 1 2001:4b10:1005:0:205:b4ff:fe12:530 64 bytes from 2001:4b10:1005:0:205:b4ff:fe12:530: icmp_seq=1 ttl=64 time=0.921 ms # ip -6 r d 2000::/3 via fe80::230:18ff:feb0:25c2 dev eth0
Adding a ::/0 route doesn't work: # ip -6 r a ::/0 via fe80::230:18ff:feb0:25c2 dev eth0 # ping6 -c 1 2001:4b10:1005:0:205:b4ff:fe12:530 connect: Network is unreachable
A route assigned by addrconf works.
Reverting this patch from 2.6.22-rc3 fixes it: commit f11e6659ce9058928d73ff440f9b40a818d628ab Author: David S. Miller <davem@sunset.davemloft.net> Date: Sat Mar 24 20:36:25 2007 -0700 [IPV6]: Fix routing round-robin locking.
This patch is was added to 2.6.20.5, breaking -stable too.
With RT6_DEBUG 3 in route.c (plus some additional debug statements):
Manual default route: [ 535.981000] fib6_add_rt2node [ 535.981000] fib6_add_rt2node fn->fn_flags = 00000007 (RTN_TL_ROOT=00000001) [ 535.981000] fib6_add_rt2node fn->leaf = b0697be0 (ip6_null_entry = b0697be0) [ 535.981000] fib6_add_rt2node rt->rt6i_flags = 00000003 (RTF_DEFAULT = 00010000, RTF_ADDRCONF = 00040000) [ 535.981000] fib6_add_rt2node goto out... [ 535.981000] fib6_add_rt2node out:
Ping6: [ 570.903000] rt6_select(fn->leaf=b1b63140, oif=0) [ 570.903000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000 [ 570.903000] find_match m = 10, *mpri = -1 [ 570.904000] rt6_select() => b0697be0 [ 570.904000] rt6_select(fn->leaf=b1b63140, oif=0) [ 570.904000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000 [ 570.904000] find_match m = 10, *mpri = -1 [ 570.904000] rt6_select() => b0697be0
Addrconf default route: [ 624.846000] rt6_select(fn->leaf=b1b63300, oif=2) [ 624.846000] find_match rt->rt6i_gateway = 000002ff 00000000 00000000 01000000 [ 624.846000] find_match m = 10, *mpri = -1 [ 624.846000] rt6_select() => b1b63300 [ 624.846000] rt6_select(fn->leaf=b1b63300, oif=2) [ 624.846000] find_match rt->rt6i_gateway = 000002ff 00000000 00000000 01000000 [ 624.846000] find_match m = 10, *mpri = -1 [ 624.846000] rt6_select() => b1b63300 [ 624.846000] fib6_add_rt2node [ 624.846000] fib6_add_rt2node fn->fn_flags = 00000007 (RTN_TL_ROOT=00000001) [ 624.846000] fib6_add_rt2node fn->leaf = b0697be0 (ip6_null_entry = b0697be0) [ 624.846000] fib6_add_rt2node rt->rt6i_flags = 00450003 (RTF_DEFAULT = 00010000, RTF_ADDRCONF = 00040000) [ 624.846000] fib6_add_rt2node out:
Ping6: [ 689.245000] rt6_select(fn->leaf=b1b63140, oif=0) [ 689.245000] find_match rt->rt6i_gateway = 104b0120 00000510 ffb40502 300512fe [ 689.245000] find_match m = 10, *mpri = -1 [ 689.245000] rt6_select() => b1b63140 [ 689.245000] rt6_select(fn->leaf=b1b63140, oif=0) [ 689.245000] find_match rt->rt6i_gateway = 104b0120 00000510 ffb40502 300512fe [ 689.245000] find_match m = 10, *mpri = -1 [ 689.245000] rt6_select() => b1b63140 [ 689.248000] rt6_select(fn->leaf=b1b63140, oif=0) [ 689.248000] find_match rt->rt6i_gateway = 104b0120 00000510 ffb40502 300512fe [ 689.248000] find_match m = 10, *mpri = -1 [ 689.248000] rt6_select() => b1b63140 [ 689.248000] rt6_select(fn->leaf=b1b63140, oif=0) [ 689.248000] find_match rt->rt6i_gateway = 104b0120 00000510 ffb40502 300512fe [ 689.248000] find_match m = 10, *mpri = -1 [ 689.248000] rt6_select() => b1b63140 [ 689.248000] rt6_select(fn->leaf=b1b63ae0, oif=2) [ 689.248000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000 [ 689.248000] find_match m = 9, *mpri = -1 [ 689.248000] rt6_select() => b1b63ae0 [ 689.702000] rt6_select(fn->leaf=b1b63ae0, oif=2) [ 689.702000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000 [ 689.702000] find_match m = 9, *mpri = -1 [ 689.702000] rt6_select() => b1b63ae0
Manual 2000::/3 route: [ 765.424000] fib6_add_rt2node [ 765.424000] fib6_add_rt2node fn->fn_flags = 00000000 (RTN_TL_ROOT=00000001) [ 765.424000] fib6_add_rt2node fn->leaf = 00000000 (ip6_null_entry = b0697be0) [ 765.424000] fib6_add_rt2node rt->rt6i_flags = 00000003 (RTF_DEFAULT = 00010000, RTF_ADDRCONF = 00040000) [ 765.424000] fib6_add_rt2node out: [ 765.424000] fib6_add_rt2node fn->fn_flags |= RTN_RTINFO;
Ping6: [ 779.705000] rt6_select(fn->leaf=b1b63060, oif=0) [ 779.705000] find_match rt->rt6i_gateway = 000080fe 00000000 ff183002 c225b0fe [ 779.705000] find_match m = 10, *mpri = -1 [ 779.705000] rt6_select() => b1b63060 [ 779.713000] rt6_select(fn->leaf=b1b63060, oif=0) [ 779.713000] find_match rt->rt6i_gateway = 000080fe 00000000 ff183002 c225b0fe [ 779.713000] find_match m = 10, *mpri = -1 [ 779.713000] rt6_select() => b1b63060 [ 779.714000] rt6_select(fn->leaf=b1b63ae0, oif=2) [ 779.714000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000 [ 779.714000] find_match m = 9, *mpri = -1 [ 779.714000] rt6_select() => b1b63ae0
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