On 6/8/19 12:12 PM, Stefano Brivio wrote: > To avoid dumping exceptions if not requested, we can, in the future, add > support for NLM_F_MATCH as described by RFC 3549. This would also require > some changes in iproute2: whenever a 'cache' argument is given, > RTM_F_CLONED should be set in the dump request and, when filtering in the > kernel is desired, NLM_F_MATCH should be also passed. We can then signal > filtering with the NLM_F_DUMP_FILTERED whenever a NLM_F_MATCH flag caused > it.
NLM_F_MATCH is set today. iproute2 for example uses NLM_F_DUMP for dump requests and NLM_F_DUMP is defined as: #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) further, the kernel already supports kernel side filtering now for routes. See ip_valid_fib_dump_req.
