From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: [RFC v2 bpf-next 0/9] bpf: Add helper to do FIB lookups Date: Sun, 29 Apr 2018 11:07:43 -0700 Message-ID: <20180429180752.15428-1-dsahern@gmail.com> Cc: davem@davemloft.net, shm@cumulusnetworks.com, roopa@cumulusnetworks.com, brouer@redhat.com, toke@toke.dk, john.fastabend@gmail.com, David Ahern To: netdev@vger.kernel.org, borkmann@iogearbox.net, ast@kernel.org Return-path: Received: from mail-pf0-f195.google.com ([209.85.192.195]:37500 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753782AbeD2SID (ORCPT ); Sun, 29 Apr 2018 14:08:03 -0400 Received: by mail-pf0-f195.google.com with SMTP id e9so1056376pfi.4 for ; Sun, 29 Apr 2018 11:08:03 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: Provide a helper for doing a FIB and neighbor lookups 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. 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. 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 examples 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 | 110 +++++++++++++ samples/bpf/xdp_fwd_user.c | 136 +++++++++++++++ tools/testing/selftests/bpf/bpf_helpers.h | 3 + 14 files changed, 847 insertions(+), 75 deletions(-) create mode 100644 samples/bpf/xdp_fwd_kern.c create mode 100644 samples/bpf/xdp_fwd_user.c -- 2.11.0