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flow_dissector: Make 'bpf_flow_dissect' return the bpf program retcode

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Let 'bpf_flow_dissect' callers know the BPF program's retcode and act
accordingly.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220821113519.116765-2-shmulik.ladkani@gmail.com
This commit is contained in:
Shmulik Ladkani 2022-08-21 14:35:16 +03:00 committed by Daniel Borkmann
parent b979f005d9
commit 0ba985024a
3 changed files with 10 additions and 9 deletions
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4
include/linux/skbuff.h
View File

@ -1460,8 +1460,8 @@ void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
unsigned int key_count);
struct bpf_flow_dissector;
bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
__be16 proto, int nhoff, int hlen, unsigned int flags);
u32 bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
__be16 proto, int nhoff, int hlen, unsigned int flags);
bool __skb_flow_dissect(const struct net *net,
const struct sk_buff *skb,

2
net/bpf/test_run.c
View File

@ -1445,7 +1445,7 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
bpf_test_timer_enter(&t);
do {
retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
size, flags);
size, flags) == BPF_OK;
} while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
bpf_test_timer_leave(&t);

13
net/core/flow_dissector.c
View File

@ -866,8 +866,8 @@ static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
}
}
bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
__be16 proto, int nhoff, int hlen, unsigned int flags)
u32 bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
__be16 proto, int nhoff, int hlen, unsigned int flags)
{
struct bpf_flow_keys *flow_keys = ctx->flow_keys;
u32 result;
@ -892,7 +892,7 @@ bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
flow_keys->thoff = clamp_t(u16, flow_keys->thoff,
flow_keys->nhoff, hlen);
return result == BPF_OK;
return result;
}
static bool is_pppoe_ses_hdr_valid(const struct pppoe_hdr *hdr)
@ -1008,6 +1008,7 @@ bool __skb_flow_dissect(const struct net *net,
};
__be16 n_proto = proto;
struct bpf_prog *prog;
u32 result;
if (skb) {
ctx.skb = skb;
@ -1019,12 +1020,12 @@ bool __skb_flow_dissect(const struct net *net,
}
prog = READ_ONCE(run_array->items[0].prog);
ret = bpf_flow_dissect(prog, &ctx, n_proto, nhoff,
hlen, flags);
result = bpf_flow_dissect(prog, &ctx, n_proto, nhoff,
hlen, flags);
__skb_flow_bpf_to_target(&flow_keys, flow_dissector,
target_container);
rcu_read_unlock();
return ret;
return result == BPF_OK;
}
rcu_read_unlock();
}