From: David Ahern <dsah...@gmail.com>
Packets that exceed the egress MTU can not be forwarded in the fast path.
Add IPv4 and IPv6 MTU helpers that take a FIB lookup result (versus the
typical dst path) and add the calls to bpf_ipv{4,6}_fib_lookup.
v2
- add ip6_mtu_from_fib6 to ipv6_stub
- only call the new MTU helpers for fib lookups in XDP path; skb
path uses is_skb_forwardable to determine if the packet can be
sent via the egress device from the FIB lookup
David Ahern (3):
net/ipv4: Add helper to return path MTU based on fib result
net/ipv6: Add helper to return path MTU based on fib result
bpf: Add mtu checking to FIB forwarding helper
include/net/addrconf.h | 2 ++
include/net/ip6_fib.h | 6 ++++++
include/net/ip6_route.h | 3 +++
include/net/ip_fib.h | 2 ++
net/core/filter.c | 42 +++++++++++++++++++++++++++++++++++-------
net/ipv4/route.c | 31 +++++++++++++++++++++++++++++++
net/ipv6/addrconf_core.c | 8 ++++++++
net/ipv6/af_inet6.c | 1 +
net/ipv6/route.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
9 files changed, 136 insertions(+), 7 deletions(-)
--
2.11.0
