DP-7586 Fail parsing on unsupported RIB_GENERIC SAFI

[dfkyle]

The Problem

The RIB_GENERIC parser tries to parse NLRI prefixes for unsupported SAFI types (currently we are only interested in MplsVpn).

The Solution

Skip all unsupported SAFIs. This is what the RFC recommends as well.

An implementation that does not recognize particular AFI and SAFI
values SHOULD discard the remainder of the MRT record

Note that RIB_GENERIC is a catch-all for uncommon case entries. Common use cases have dedicated subtypes (c.f. https://datatracker.ietf.org/doc/html/rfc6396#section-4.3.2).

How to Test

Skip tests that make network requests

support@docker-host-unknown:~/bgpkit-parser$ cargo clippy && \
OPENSSL_DIR=/usr OPENSSL_LIB_DIR=/usr/lib/x86_64-linux-gnu cargo test --quiet -- \
  --skip test_new_with_reader \
  --skip test_new_cached_with_reader \
  --skip test_filters_on_mrt_file \
  --skip test_filter_iter \
  --skip test_filter_iter_with_negation \
  --skip test_filter_iter_multi_peers \
  --skip test_negated_filters_on_mrt_file \
  --skip test_parser_as_paths_conversion \
  --skip test_record_iter_raw_record_iter_types \
  --skip test_encode_small \
  --skip test_encode_ipv6 \
  --skip test_encode_large \
  --skip test_encode_table_dump_v1
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.10s

running 460 tests
....................................................................................... 87/460
....................................................................................... 174/460
....................................................................................... 261/460
....................................................................................... 348/460
....................................................................................... 435/460
.........................
test result: ok. 460 passed; 0 failed; 0 ignored; 0 measured; 10 filtered out; finished in 1.42s


running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 2 filtered out; finished in 0.00s


running 5 tests
.....
test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s


running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 4 filtered out; finished in 0.00s


running 46 tests
iii...............iii.........................
test result: ok. 40 passed; 0 failed; 6 ignored; 0 measured; 0 filtered out; finished in 1.00s