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Problem (ipv4 only):
Todays libnl route cache looks at prefix + tos + priority to lookup a
route object. To support route append operation, where routes with same
prefix + tos + priority but different nexthop information can co-exist,
we need to also look at nexthop info. Else we will wrongly store only
one route for all appended routes. This happens Because the libnl cache
inclusion process looks up a route by prefix + tos + priority and replaces
it with the new object with the same prefix + tos + priority.
Only adding nexthop attribute during lookup does not solve the whole
problem. Because NLM_F_REPLACE of objects needs special handling.
This patch implements route cache callback .co_cache_search_attrs_get and
route object callback .oo_hash_attrs_get to return appropriate attributes
for searching route objects depending on type of route and the netlink message
flags (NLM_F_APPEND or NLM_F_REPLACE). This is used during cache inclusion
process. Also adds ROUTE_ATTR_MULTIPATH to the list of route attribute keys to
search.
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
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$ sed -i 's/^\([\t ]\+\<__ADD\> \?([^)]\+)\) *$/\1,/' `git grep -w -l __ADD`
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Thomas Haller <thaller@redhat.com>
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This clarifies the seperation between public and private
header files.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
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This makes runtime removal of cache operations possible if non-safe
API is not in use by application. The non-safe API will be removed
in the next major version.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
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Reported-by: Justin Mayfield <jmayfield@cradlepoint.com>
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Dumping objects as environment variables has never been implemented
completely and only increases the size of the library for no real
purpose. Integration into scripts is better achieved by implementing
a python module anyway.
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In order for the interface to become more thread safe, the error
handling was revised to no longer depend on a static errno and
error string buffer.
This patch converts all error paths to return a libnl specific
error code which can be translated to a error message using
nl_geterror(int error). The functions nl_error() and
nl_get_errno() are therefore obsolete.
This change required various sets of function prototypes to be
changed in order to return an error code, the most prominent
are:
struct nl_cache *foo_alloc_cache(...);
changed to:
int foo_alloc_cache(..., struct nl_cache **);
struct nl_msg *foo_build_request(...);
changed to:
int foo_build_request(..., struct nl_msg **);
struct foo *foo_parse(...);
changed to:
int foo_parse(..., struct foo **);
This pretty much only leaves trivial allocation functions to
still return a pointer object which can still return NULL to
signal out of memory.
This change is a serious API and ABI breaker, sorry!
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Adds all missing routing attributes and brings the routing
related code to a working state. In the process the API
was broken several times with the justification that nobody
is using this code yet.
The changes include new example code which is also a prototype
for how plain CLI tools could look like to control routes.
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