| Message ID | 20221004152036.7848-4-netdev@kapio-technology.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v2,iproute2-next,1/4] include: uapi: MacAuth and Blackhole feature header changes | expand |
On Tue, Oct 04, 2022 at 05:20:36PM +0200, Hans Schultz wrote: > Block traffic to a specific host with the command: > bridge fdb add <MAC> vlan <vid> dev br0 blackhole > > Blackhole FDB entries can be added, deleted and replaced with > ordinary FDB entries. > > Example with output: > > $ bridge fdb add 10:10:10:10:10:10 dev br0 blackhole > $ bridge -d fdb show dev br0 > 10:10:10:10:10:10 vlan 1 blackhole master br0 permanent > 10:10:10:10:10:10 blackhole master br0 permanent > $ bridge -d -j -p fdb show dev br0 > [ { > "mac": "10:10:10:10:10:10", > "vlan": 1, > "flags": [ "blackhole" ], > "master": "br0", > "state": "permanent" > },{ > "mac": "10:10:10:10:10:10", > "flags": [ "blackhole" ], > "master": "br0", > "state": "permanent" > } ] > > Signed-off-by: Hans Schultz <netdev@kapio-technology.com> > --- > bridge/fdb.c | 13 ++++++++++++- > man/man8/bridge.8 | 12 ++++++++++++ > 2 files changed, 24 insertions(+), 1 deletion(-) > > diff --git a/bridge/fdb.c b/bridge/fdb.c > index f1f0a5bb..1c8c50a8 100644 > --- a/bridge/fdb.c > +++ b/bridge/fdb.c > @@ -38,7 +38,7 @@ static void usage(void) > fprintf(stderr, > "Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n" > " [ self ] [ master ] [ use ] [ router ] [ extern_learn ]\n" > - " [ sticky ] [ local | static | dynamic ] [ vlan VID ]\n" > + " [ sticky ] [ local | static | dynamic ] [ blackhole ] [ vlan VID ]\n" > " { [ dst IPADDR ] [ port PORT] [ vni VNI ] | [ nhid NHID ] }\n" > " [ via DEV ] [ src_vni VNI ]\n" > " bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ]\n" > @@ -116,6 +116,9 @@ static void fdb_print_flags(FILE *fp, unsigned int flags, __u8 ext_flags) > if (flags & NTF_STICKY) > print_string(PRINT_ANY, NULL, "%s ", "sticky"); > > + if (ext_flags & NTF_EXT_BLACKHOLE) > + print_string(PRINT_ANY, NULL, "%s ", "blackhole"); > + > if (ext_flags & NTF_EXT_LOCKED) > print_string(PRINT_ANY, NULL, "%s ", "locked"); > > @@ -421,6 +424,7 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv) > char *endptr; > short vid = -1; > __u32 nhid = 0; > + __u32 ext_flags = 0; > > while (argc > 0) { > if (strcmp(*argv, "dev") == 0) { > @@ -492,6 +496,8 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv) > req.ndm.ndm_flags |= NTF_EXT_LEARNED; > } else if (matches(*argv, "sticky") == 0) { > req.ndm.ndm_flags |= NTF_STICKY; > + } else if (matches(*argv, "blackhole") == 0) { > + ext_flags |= NTF_EXT_BLACKHOLE; The policy seems to be to use strcmp() instead of matches() in new code: https://lore.kernel.org/netdev/f7251b13-dbf2-f86c-6c2a-2c037b208017@gmail.com/ > } else { > if (strcmp(*argv, "to") == 0) > NEXT_ARG(); > @@ -534,6 +540,11 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv) > if (dst_ok) > addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen); > > + if (ext_flags && > + addattr_l(&req.n, sizeof(req), NDA_FLAGS_EXT, &ext_flags, > + sizeof(ext_flags)) < 0) addattr32() ? I will check the kernel patches now. I wouldn't submit a new version to iproute2-next until the kernel patches are accepted. > + return -1; > + > if (vid >= 0) > addattr16(&req.n, sizeof(req), NDA_VLAN, vid); > if (nhid > 0) > diff --git a/man/man8/bridge.8 b/man/man8/bridge.8 > index f4f1d807..0119a2a9 100644 > --- a/man/man8/bridge.8 > +++ b/man/man8/bridge.8 > @@ -85,6 +85,13 @@ bridge \- show / manipulate bridge addresses and devices > .B nhid > .IR NHID " } " > > +.ti -8 > +.BR "bridge fdb" " { " add " | " del " } " > +.I LLADR > +.B dev > +.IR BRDEV " [ " > +.BR self " ] [ " local " ] [ " blackhole " ] " > + > .ti -8 > .BR "bridge fdb" " [ [ " show " ] [ " > .B br > @@ -701,6 +708,11 @@ controller learnt dynamic entry. Kernel will not age such an entry. > - this entry will not change its port due to learning. > .sp > > +.B blackhole > +- this entry will silently discard all matching packets. The entry must > +be added as a local permanent entry. > +.sp > + > .in -8 > The next command line parameters apply only > when the specified device > -- > 2.34.1 >
diff --git a/bridge/fdb.c b/bridge/fdb.c index f1f0a5bb..1c8c50a8 100644 --- a/bridge/fdb.c +++ b/bridge/fdb.c @@ -38,7 +38,7 @@ static void usage(void) fprintf(stderr, "Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n" " [ self ] [ master ] [ use ] [ router ] [ extern_learn ]\n" - " [ sticky ] [ local | static | dynamic ] [ vlan VID ]\n" + " [ sticky ] [ local | static | dynamic ] [ blackhole ] [ vlan VID ]\n" " { [ dst IPADDR ] [ port PORT] [ vni VNI ] | [ nhid NHID ] }\n" " [ via DEV ] [ src_vni VNI ]\n" " bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ]\n" @@ -116,6 +116,9 @@ static void fdb_print_flags(FILE *fp, unsigned int flags, __u8 ext_flags) if (flags & NTF_STICKY) print_string(PRINT_ANY, NULL, "%s ", "sticky"); + if (ext_flags & NTF_EXT_BLACKHOLE) + print_string(PRINT_ANY, NULL, "%s ", "blackhole"); + if (ext_flags & NTF_EXT_LOCKED) print_string(PRINT_ANY, NULL, "%s ", "locked"); @@ -421,6 +424,7 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv) char *endptr; short vid = -1; __u32 nhid = 0; + __u32 ext_flags = 0; while (argc > 0) { if (strcmp(*argv, "dev") == 0) { @@ -492,6 +496,8 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv) req.ndm.ndm_flags |= NTF_EXT_LEARNED; } else if (matches(*argv, "sticky") == 0) { req.ndm.ndm_flags |= NTF_STICKY; + } else if (matches(*argv, "blackhole") == 0) { + ext_flags |= NTF_EXT_BLACKHOLE; } else { if (strcmp(*argv, "to") == 0) NEXT_ARG(); @@ -534,6 +540,11 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv) if (dst_ok) addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen); + if (ext_flags && + addattr_l(&req.n, sizeof(req), NDA_FLAGS_EXT, &ext_flags, + sizeof(ext_flags)) < 0) + return -1; + if (vid >= 0) addattr16(&req.n, sizeof(req), NDA_VLAN, vid); if (nhid > 0) diff --git a/man/man8/bridge.8 b/man/man8/bridge.8 index f4f1d807..0119a2a9 100644 --- a/man/man8/bridge.8 +++ b/man/man8/bridge.8 @@ -85,6 +85,13 @@ bridge \- show / manipulate bridge addresses and devices .B nhid .IR NHID " } " +.ti -8 +.BR "bridge fdb" " { " add " | " del " } " +.I LLADR +.B dev +.IR BRDEV " [ " +.BR self " ] [ " local " ] [ " blackhole " ] " + .ti -8 .BR "bridge fdb" " [ [ " show " ] [ " .B br @@ -701,6 +708,11 @@ controller learnt dynamic entry. Kernel will not age such an entry. - this entry will not change its port due to learning. .sp +.B blackhole +- this entry will silently discard all matching packets. The entry must +be added as a local permanent entry. +.sp + .in -8 The next command line parameters apply only when the specified device
Block traffic to a specific host with the command: bridge fdb add <MAC> vlan <vid> dev br0 blackhole Blackhole FDB entries can be added, deleted and replaced with ordinary FDB entries. Example with output: $ bridge fdb add 10:10:10:10:10:10 dev br0 blackhole $ bridge -d fdb show dev br0 10:10:10:10:10:10 vlan 1 blackhole master br0 permanent 10:10:10:10:10:10 blackhole master br0 permanent $ bridge -d -j -p fdb show dev br0 [ { "mac": "10:10:10:10:10:10", "vlan": 1, "flags": [ "blackhole" ], "master": "br0", "state": "permanent" },{ "mac": "10:10:10:10:10:10", "flags": [ "blackhole" ], "master": "br0", "state": "permanent" } ] Signed-off-by: Hans Schultz <netdev@kapio-technology.com> --- bridge/fdb.c | 13 ++++++++++++- man/man8/bridge.8 | 12 ++++++++++++ 2 files changed, 24 insertions(+), 1 deletion(-)