- Inet diag allows users to gather low-level socket information.
- This library provides a higher-level API for creating inetdiag requests (via
idiagnl_connect and idiagnl_send_simple) and parsing the replies (via
idiagnl_msg_parse). A cache is also provided (via idiagnl_msg_alloc_cache).
- Request and message objects provide APIs for accessing and setting the
various properties of each.
- This library also allows the user to parse the inetdiag response attributes
which contain information about traffic class, TOS, congestion, socket
memory info, and more depending on the kernel version used.
- Includes doxygen documentation.
Provide wrapper function for generic netlink library functions. The
genlmsg_parse() function is handled similar to nla_parse_nested() so
it returns tuple with error code and dictionary of parsed attributes.
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
This commit adds creation of the netlink.genl package. The actual
capi.i will be filled in upcoming commits so the module is rather
dumb for now.
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
added support functions to access the netlink attributes and use
custom callback handlers. Most is wrapped as is, but there are
a couple of special cases handled.
1) void *nla_data(struct nlattr *);
The return value is changed to a Python byte array so it includes
the lenght of the data stream.
2) int nla_parse_nested(...);
This returns a tuple (err, dict). 'err' is the error code and 'dict'
is a dictionary with attribute identifier as key and value represents
a struct nlattr object.
3) macro nla_for_each_nested()
Provide nla_get_nested() which returns a Python list of struct nlattr
objects that is iterable.
4) allocate struct nla_policy array
Provide nla_policy_array() function that allocates consecutive space
in memory for struct nla_policy array entries. Each entry is put in
a Python list so the entry fields can be modified in Python. This
array object can be passed to the nla_parse_nested() function.
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
If a hdrlen was provided that was greather than the actual
message length, a negative attributes length would result.
This was typically happening for RTM_GETLINK requests where
we can get a away with a 4 bytes header on the request side
but the response would use a 16 bytes header.
This resulted in strange -8 bytes leftover debug messages.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
The batched verdict implicitely ACKs all queue packet IDs up to the
one send back, which reduces the number of verdict messages send
to the kernel.
Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Since commit "nl: Return -NLE_AGAIN if non-blocking socket would block",
nl_cache_mngr_data_ready returns -NLE_AGAIN to callers on non-blocking sockets.
Change it to consider -NLE_AGAIN as a non-error case as it is expected behavior
with the nl_recv changes.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Since commit: "cache pickup: Avoid duplicates during cache pickup",
nfnl_ct_alloc_cache no longer properly fills the cache, as it doesn't
define oo_id_attrs so all items are considered duplicates.
Instead of adding a ~0 oo_id_attrs to ct_obj, this changes
nl_object_identical to default to comparing all attributes if
neither oo_id_attrs_get or oo_id_attrs are provided.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Assuming that the kernel does not send more than a page is no longer valid,
and enabling MSG_PEEK'ing by default to figure out the exact message buffer
requirements can have a negative influence on the performance of existing
applications. Bumping the default receive buffer space to 4 pages seems
a sane default.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
rtnl_link_af_unregister() attempts to write-lock info_lock twice
instead of releasing it before returning. It also will return with
info_lock write-locked if passed a NULL ops.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
There seams to be an error in the calculation of needed space for the message in nla_reserve. The current size of the message is counted twice: Once in NLMSG_ALIGN, once in the condition below.
This causes nla_put_* calls to be rejected if the allocation size of the message has been strictly calculated by the caller.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
- each *_get() should have corresponding *_put(). That rule was broken in nl_socket_alloc()
- Also, check if cb is NULL in nl_socket_set_cb (calls BUG())
Passing a NULL pointer would cause a NULL pointer dereference within
nl_object_free().
Returning early on NULL pointer is the behavior free(3) and other
nl*_free() functions.
Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
Previously 0 was returned which gave the caller no chance of detecting
when a non-blocking socket would block. If a caller intends to never
see an error message it should utilize poll()/select() to only read
when the socket has pending data or information.
Reported-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Add ICMPv6 type, code and ID (if set) by using the already available
conntrack atttributes.
Currently the ICMPv6 conntrack objects in libnl are without type, code
and ID. This e. g. is the output of nl_object_dump() without the patch:
ipv6-icmp ::1 <-> ::1
id 0xdd0871f0 family inet6 timeout 30s <NOREPLY,SNAT_INIT,DNAT_INIT>
The attached patch tries to solve that. It then looks like
ipv6-icmp ::1 <-> ::1 icmp type 128 code 0 id 28253
id 0xdf3a11f0 family inet6 timeout 30s <SNAT_INIT,DNAT_INIT>
It is the 'small' approach, because it reuses the existing ICMP
attributes of the conntrack object (currently only used for IPv4).
This way I can avoid to add new _icmp6_get_, _icmp6_set_ and
_icmp6_test_ functions.
Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
The cache layer uses the message type array stored in the cache
ops to lookup which cache a message belongs to. Update to the
the message array with the resolved generic netlink id to make
it compatible with the caching API.
Allows to use nl_cache_refill() and others for generic netlink
based caches with dynamic generic netlink ids.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Reason: there is no rtnl_link_free() definition anywhere in the code.
Signed-off-by: Tony Cheneau <tony.cheneau@amnesiak.org>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
rtnl_route_put() is declared twice in the same header file
Signed-off-by: Tony Cheneau <tony.cheneau@amnesiak.org>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Previously if using rtnl_addr_set_prefixlen() the new prefix length
was not forwarded to the corresponding 'struct nl_addr' objects
associated with address already and thus the comparison function
would fail.
This patch also clears the internal ADDR_ATTR_PREFIXLEN flag if
the prefix length has been reset.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Introduces new unit tests based on `check`. Each subsystem/module can
have its own unit tests in tests/check-<name>.c that will be linked
together in tests/check-all.c.
Running 'make check' will compile and run the unit tests automatically.
A reference unit test implementation has been done for the abstract
address module.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
memset() the binary address before overwriting it with new data
to avoid leaving around old portions of the address.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
