From 96c5508e3012ed0984ab93821d64ac1ff3279c09 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Sun, 10 Sep 2017 09:47:02 +0200 Subject: xdp: implement xdp_redirect_map for generic XDP Using bpf_redirect_map is allowed for generic XDP programs, but the appropriate map lookup was never performed in xdp_do_generic_redirect(). Instead the map-index is directly used as the ifindex. For the xdp_redirect_map sample in SKB-mode '-S', this resulted in trying sending on ifindex 0 which isn't valid, resulting in getting SKB packets dropped. Thus, the reported performance numbers are wrong in commit 24251c264798 ("samples/bpf: add option for native and skb mode for redirect apps") for the 'xdp_redirect_map -S' case. Before commit 109980b894e9 ("bpf: don't select potentially stale ri->map from buggy xdp progs") it could crash the kernel. Like this commit also check that the map_owner owner is correct before dereferencing the map pointer. But make sure that this API misusage can be caught by a tracepoint. Thus, allowing userspace via tracepoints to detect misbehaving bpf_progs. Fixes: 6103aa96ec07 ("net: implement XDP_REDIRECT for xdp generic") Fixes: 24251c264798 ("samples/bpf: add option for native and skb mode for redirect apps") Signed-off-by: Jesper Dangaard Brouer Signed-off-by: David S. Miller --- include/trace/events/xdp.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h index 862575ac8da9..4e16c43fba10 100644 --- a/include/trace/events/xdp.h +++ b/include/trace/events/xdp.h @@ -138,11 +138,11 @@ DEFINE_EVENT_PRINT(xdp_redirect_template, xdp_redirect_map_err, #define _trace_xdp_redirect_map(dev, xdp, fwd, map, idx) \ trace_xdp_redirect_map(dev, xdp, fwd ? fwd->ifindex : 0, \ - 0, map, idx); + 0, map, idx) #define _trace_xdp_redirect_map_err(dev, xdp, fwd, map, idx, err) \ trace_xdp_redirect_map_err(dev, xdp, fwd ? fwd->ifindex : 0, \ - err, map, idx); + err, map, idx) #endif /* _TRACE_XDP_H */ -- cgit