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net: plumb network namespace into __skb_flow_dissect

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This new argument will be used in the next patches for the
eth_get_headlen use case. eth_get_headlen calls flow dissector
with only data (without skb) so there is currently no way to
pull attached BPF flow dissector program. With this new argument,
we can amend the callers to explicitly pass network namespace
so we can use attached BPF program.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Stanislav Fomichev
2019-04-22 08:55:46 -07:00
committed by Daniel Borkmann
parent 7b8a130432
commit 3cbf4ffba5
3 changed files with 31 additions and 20 deletions
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19
include/linux/skbuff.h
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@@ -1284,7 +1284,8 @@ bool __skb_flow_bpf_dissect(struct bpf_prog *prog,
const struct sk_buff *skb,
struct flow_dissector *flow_dissector,
struct bpf_flow_keys *flow_keys);
bool __skb_flow_dissect(const struct sk_buff *skb,
bool __skb_flow_dissect(const struct net *net,
const struct sk_buff *skb,
struct flow_dissector *flow_dissector,
void *target_container,
void *data, __be16 proto, int nhoff, int hlen,
@@ -1294,8 +1295,8 @@ static inline bool skb_flow_dissect(const struct sk_buff *skb,
struct flow_dissector *flow_dissector,
void *target_container, unsigned int flags)
{
return __skb_flow_dissect(skb, flow_dissector, target_container,
NULL, 0, 0, 0, flags);
return __skb_flow_dissect(NULL, skb, flow_dissector,
target_container, NULL, 0, 0, 0, flags);
}
static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb,
@@ -1303,18 +1304,19 @@ static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb,
unsigned int flags)
{
memset(flow, 0, sizeof(*flow));
return __skb_flow_dissect(skb, &flow_keys_dissector, flow,
NULL, 0, 0, 0, flags);
return __skb_flow_dissect(NULL, skb, &flow_keys_dissector,
flow, NULL, 0, 0, 0, flags);
}
static inline bool
skb_flow_dissect_flow_keys_basic(const struct sk_buff *skb,
skb_flow_dissect_flow_keys_basic(const struct net *net,
const struct sk_buff *skb,
struct flow_keys_basic *flow, void *data,
__be16 proto, int nhoff, int hlen,
unsigned int flags)
{
memset(flow, 0, sizeof(*flow));
return __skb_flow_dissect(skb, &flow_keys_basic_dissector, flow,
return __skb_flow_dissect(net, skb, &flow_keys_basic_dissector, flow,
data, proto, nhoff, hlen, flags);
}
@@ -2492,7 +2494,8 @@ static inline void skb_probe_transport_header(struct sk_buff *skb)
if (skb_transport_header_was_set(skb))
return;
if (skb_flow_dissect_flow_keys_basic(skb, &keys, NULL, 0, 0, 0, 0))
if (skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
NULL, 0, 0, 0, 0))
skb_set_transport_header(skb, keys.control.thoff);
}