From: David Ahern <dsahern@gmail•com>
To: netdev@vger•kernel.org, borkmann@iogearbox•net, ast@kernel•org
Cc: davem@davemloft•net, shm@cumulusnetworks•com,
roopa@cumulusnetworks•com, brouer@redhat•com, toke@toke•dk,
john.fastabend@gmail•com, David Ahern <dsahern@gmail•com>
Subject: [bpf-next v1 0/9] bpf: Add helper to do FIB lookups
Date: Wed, 2 May 2018 20:53:10 -0700 [thread overview]
Message-ID: <20180503035319.18290-1-dsahern@gmail.com> (raw)
Provide a helper for doing a FIB and neighbor lookup in the kernel
tables from an XDP program. The helper provides a fastpath for forwarding
packets. If the packet is a local delivery or for any reason is not a
simple lookup and forward, the packet is expected to continue up the stack
for full processing.
The response from a FIB and neighbor lookup is either the egress index
with the bpf_fib_lookup struct filled in with dmac and gateway or
0 meaning the packet should continue up the stack. In time we can
visit this to return the FIB lookup result errno if it is one of the
special RTN_'s such as RTN_BLACKHOLE (-EINVAL) so that the XDP
programs can do an early drop if desired.
Patches 1-6 do some more refactoring to IPv6 with the end goal of
extracting a FIB lookup function that aligns with fib_lookup for IPv4,
basically returning a fib6_info without creating a dst based entry.
Patch 7 adds lookup functions to the ipv6 stub. These are needed since
bpf is built into the kernel and ipv6 may not be built or loaded.
Patch 8 adds the bpf helper and 9 adds a sample program.
v1
- updated commit messages and cover letter
- added comment to sample program noting lack of verification on
egress device supporting XDP
RFC v2
- fixed use of foward helper from cls_act as noted by Daniel
- in patch 1 rename fib6_lookup_1 as well for consistency
David Ahern (9):
net/ipv6: Rename fib6_lookup to fib6_node_lookup
net/ipv6: Rename rt6_multipath_select
net/ipv6: Extract table lookup from ip6_pol_route
net/ipv6: Refactor fib6_rule_action
net/ipv6: Add fib6_lookup
net/ipv6: Update fib6 tracepoint to take fib6_info
net/ipv6: Add fib lookup stubs for use in bpf helper
bpf: Provide helper to do lookups in kernel FIB table
samples/bpf: Add example of ipv4 and ipv6 forwarding in XDP
include/net/addrconf.h | 14 ++
include/net/ip6_fib.h | 21 ++-
include/trace/events/fib6.h | 14 +-
include/uapi/linux/bpf.h | 83 +++++++++-
net/core/filter.c | 263 ++++++++++++++++++++++++++++++
net/ipv6/addrconf_core.c | 33 +++-
net/ipv6/af_inet6.c | 6 +-
net/ipv6/fib6_rules.c | 138 +++++++++++++---
net/ipv6/ip6_fib.c | 21 ++-
net/ipv6/route.c | 76 +++++----
samples/bpf/Makefile | 4 +
samples/bpf/xdp_fwd_kern.c | 113 +++++++++++++
samples/bpf/xdp_fwd_user.c | 136 +++++++++++++++
tools/testing/selftests/bpf/bpf_helpers.h | 3 +
14 files changed, 850 insertions(+), 75 deletions(-)
create mode 100644 samples/bpf/xdp_fwd_kern.c
create mode 100644 samples/bpf/xdp_fwd_user.c
--
2.11.0
next reply other threads:[~2018-05-03 3:53 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-03 3:53 David Ahern [this message]
2018-05-03 3:53 ` [bpf-next v1 1/9] net/ipv6: Rename fib6_lookup to fib6_node_lookup David Ahern
2018-05-03 3:53 ` [bpf-next v1 2/9] net/ipv6: Rename rt6_multipath_select David Ahern
2018-05-03 3:53 ` [bpf-next v1 3/9] net/ipv6: Extract table lookup from ip6_pol_route David Ahern
2018-05-03 3:53 ` [bpf-next v1 4/9] net/ipv6: Refactor fib6_rule_action David Ahern
2018-05-03 3:53 ` [bpf-next v1 5/9] net/ipv6: Add fib6_lookup David Ahern
2018-05-03 3:53 ` [bpf-next v1 6/9] net/ipv6: Update fib6 tracepoint to take fib6_info David Ahern
2018-05-03 3:53 ` [bpf-next v1 7/9] net/ipv6: Add fib lookup stubs for use in bpf helper David Ahern
2018-05-03 3:53 ` [bpf-next v1 8/9] bpf: Provide helper to do lookups in kernel FIB table David Ahern
2018-05-04 0:45 ` Daniel Borkmann
2018-05-04 0:47 ` David Ahern
2018-05-03 3:53 ` [bpf-next v1 9/9] samples/bpf: Add example of ipv4 and ipv6 forwarding in XDP David Ahern
2018-05-08 5:33 ` [lkp-robot] [samples/bpf] a0bad08afa: kernel_selftests.test_tcpbpf_user.fail kernel test robot
2018-05-03 15:40 ` [bpf-next v1 0/9] bpf: Add helper to do FIB lookups David Miller
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