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flow_dissector: switch kernel context to struct bpf_flow_dissector

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struct bpf_flow_dissector has a small subset of sk_buff fields that
flow dissector BPF program is allowed to access and an optional
pointer to real skb. Real skb is used only in bpf_skb_load_bytes
helper to read non-linear data.

The real motivation for this is to be able to call flow dissector
from eth_get_headlen context where we don't have an skb and need
to dissect raw bytes.

Signed-off-by: Stanislav Fomichev <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
This commit is contained in:
Stanislav Fomichev 2019-04-22 08:55:44 -07:00 • committed by Daniel Borkmann
commit 089b19a920
6 changed files with 117 additions and 59 deletions
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4
net/bpf/test_run.c
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@ -382,7 +382,6 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
u32 repeat = kattr->test.repeat;
struct bpf_flow_keys flow_keys;
u64 time_start, time_spent = 0;
struct bpf_skb_data_end *cb;
u32 retval, duration;
struct sk_buff *skb;
struct sock *sk;
@ -423,9 +422,6 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
current->nsproxy->net_ns->loopback_dev);
skb_reset_network_header(skb);
cb = (struct bpf_skb_data_end *)skb->cb;
cb->qdisc_cb.flow_keys = &flow_keys;
if (!repeat)
repeat = 1;