kernel.git/net/bridge/br_mdb.c, branch linux-5.2.y

bridge/mdb: remove wrong use of NLM_F_MULTI

2019-09-19T07:10:38Z

[ Upstream commit 94a72b3f024fc7e9ab640897a1e38583a470659d ] NLM_F_MULTI must be used only when a NLMSG_DONE message is sent at the end. In fact, NLMSG_DONE is sent only at the end of a dump. Libraries like libnl will wait forever for NLMSG_DONE. Fixes: 949f1e39a617 ("bridge: mdb: notify on router port add and del") CC: Nikolay Aleksandrov Signed-off-by: Nicolas Dichtel Acked-by: Nikolay Aleksandrov Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

netlink: make validation more configurable for future strictness

2019-04-27T21:07:21Z

We currently have two levels of strict validation: 1) liberal (default) - undefined (type >= max) & NLA_UNSPEC attributes accepted - attribute length >= expected accepted - garbage at end of message accepted 2) strict (opt-in) - NLA_UNSPEC attributes accepted - attribute length >= expected accepted Split out parsing strictness into four different options: * TRAILING - check that there's no trailing data after parsing attributes (in message or nested) * MAXTYPE - reject attrs > max known type * UNSPEC - reject attributes with NLA_UNSPEC policy entries * STRICT_ATTRS - strictly validate attribute size The default for future things should be *everything*. The current *_strict() is a combination of TRAILING and MAXTYPE, and is renamed to _deprecated_strict(). The current regular parsing has none of this, and is renamed to *_parse_deprecated(). Additionally it allows us to selectively set one of the new flags even on old policies. Notably, the UNSPEC flag could be useful in this case, since it can be arranged (by filling in the policy) to not be an incompatible userspace ABI change, but would then going forward prevent forgetting attribute entries. Similar can apply to the POLICY flag. We end up with the following renames: * nla_parse -> nla_parse_deprecated * nla_parse_strict -> nla_parse_deprecated_strict * nlmsg_parse -> nlmsg_parse_deprecated * nlmsg_parse_strict -> nlmsg_parse_deprecated_strict * nla_parse_nested -> nla_parse_nested_deprecated * nla_validate_nested -> nla_validate_nested_deprecated Using spatch, of course: @@ expression TB, MAX, HEAD, LEN, POL, EXT; @@ -nla_parse(TB, MAX, HEAD, LEN, POL, EXT) +nla_parse_deprecated(TB, MAX, HEAD, LEN, POL, EXT) @@ expression NLH, HDRLEN, TB, MAX, POL, EXT; @@ -nlmsg_parse(NLH, HDRLEN, TB, MAX, POL, EXT) +nlmsg_parse_deprecated(NLH, HDRLEN, TB, MAX, POL, EXT) @@ expression NLH, HDRLEN, TB, MAX, POL, EXT; @@ -nlmsg_parse_strict(NLH, HDRLEN, TB, MAX, POL, EXT) +nlmsg_parse_deprecated_strict(NLH, HDRLEN, TB, MAX, POL, EXT) @@ expression TB, MAX, NLA, POL, EXT; @@ -nla_parse_nested(TB, MAX, NLA, POL, EXT) +nla_parse_nested_deprecated(TB, MAX, NLA, POL, EXT) @@ expression START, MAX, POL, EXT; @@ -nla_validate_nested(START, MAX, POL, EXT) +nla_validate_nested_deprecated(START, MAX, POL, EXT) @@ expression NLH, HDRLEN, MAX, POL, EXT; @@ -nlmsg_validate(NLH, HDRLEN, MAX, POL, EXT) +nlmsg_validate_deprecated(NLH, HDRLEN, MAX, POL, EXT) For this patch, don't actually add the strict, non-renamed versions yet so that it breaks compile if I get it wrong. Also, while at it, make nla_validate and nla_parse go down to a common __nla_validate_parse() function to avoid code duplication. Ultimately, this allows us to have very strict validation for every new caller of nla_parse()/nlmsg_parse() etc as re-introduced in the next patch, while existing things will continue to work as is. In effect then, this adds fully strict validation for any new command. Signed-off-by: Johannes Berg Signed-off-by: David S. Miller

netlink: make nla_nest_start() add NLA_F_NESTED flag

2019-04-27T21:03:44Z

Even if the NLA_F_NESTED flag was introduced more than 11 years ago, most netlink based interfaces (including recently added ones) are still not setting it in kernel generated messages. Without the flag, message parsers not aware of attribute semantics (e.g. wireshark dissector or libmnl's mnl_nlmsg_fprintf()) cannot recognize nested attributes and won't display the structure of their contents. Unfortunately we cannot just add the flag everywhere as there may be userspace applications which check nlattr::nla_type directly rather than through a helper masking out the flags. Therefore the patch renames nla_nest_start() to nla_nest_start_noflag() and introduces nla_nest_start() as a wrapper adding NLA_F_NESTED. The calls which add NLA_F_NESTED manually are rewritten to use nla_nest_start(). Except for changes in include/net/netlink.h, the patch was generated using this semantic patch: @@ expression E1, E2; @@ -nla_nest_start(E1, E2) +nla_nest_start_noflag(E1, E2) @@ expression E1, E2; @@ -nla_nest_start_noflag(E1, E2 | NLA_F_NESTED) +nla_nest_start(E1, E2) Signed-off-by: Michal Kubecek Acked-by: Jiri Pirko Acked-by: David Ahern Signed-off-by: David S. Miller

net: switchdev: Add extack argument to switchdev_port_obj_add()

2018-12-13T00:34:21Z

After the previous patch, bridge driver has extack argument available to pass to switchdev. Therefore extend switchdev_port_obj_add() with this argument, updating all callers, and passing the argument through to switchdev_port_obj_notify(). Signed-off-by: Petr Machata Acked-by: Jiri Pirko Acked-by: Ivan Vecera Reviewed-by: Ido Schimmel Signed-off-by: David S. Miller

net: bridge: multicast: use non-bh rcu flavor

2018-12-06T01:01:51Z

The bridge multicast code has been using a mix of RCU and RCU-bh flavors sometimes in questionable way. Since we've moved to rhashtable just use non-bh RCU everywhere. In addition this simplifies freeing of objects and allows us to remove some unnecessary callback functions. v3: new patch Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller

net: bridge: convert multicast to generic rhashtable

2018-12-06T01:01:51Z

The bridge multicast code currently uses a custom resizable hashtable which predates the generic rhashtable interface. It has many shortcomings compared and duplicates functionality that is presently available via the generic rhashtable, so this patch removes the custom rhashtable implementation in favor of the kernel's generic rhashtable. The hash maximum is kept and the rhashtable's size is used to do a loose check if it's reached in which case we revert to the old behaviour and disable further bridge multicast processing. Also now we can support any hash maximum, doesn't need to be a power of 2. v3: add non-rcu br_mdb_get variant and use it where multicast_lock is held to avoid RCU splat, drop hash_max function and just set it directly v2: handle when IGMP snooping is undefined, add br_mdb_init/uninit placeholders Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller

net/bridge: Update br_mdb_dump for strict data checking

2018-10-08T17:39:05Z

Update br_mdb_dump for strict data checking. If the flag is set, the dump request is expected to have a br_port_msg struct as the header. All elements of the struct are expected to be 0 and no attributes can be appended. Signed-off-by: David Ahern Acked-by: Christian Brauner Signed-off-by: David S. Miller

net: bridge: convert and rename mcast disabled

2018-09-26T17:04:23Z

Convert mcast disabled to an option bit and while doing so convert the logic to check if multicast is enabled instead. That is make the logic follow the option value - if it's set then mcast is enabled and vice versa. This avoids a few confusing places where we inverted the value that's being set to follow the mcast_disabled logic. Signed-off-by: Nikolay Aleksandrov Reviewed-by: Stephen Hemminger Signed-off-by: David S. Miller

net: use rtnl_register_module where needed

2017-12-04T16:32:39Z

all of these can be compiled as a module, so use new _module version to make sure module can no longer be removed while callback/dump is in use. Signed-off-by: Florian Westphal Signed-off-by: David S. Miller

net: bridge: Add/del switchdev object on host join/leave

2017-11-10T04:41:40Z

When the host joins or leaves a multicast group, use switchdev to add an object to the hardware to forward traffic for the group to the host. Signed-off-by: Andrew Lunn Acked-by: Nikolay Aleksandrov Signed-off-by: David S. Miller