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author | Nikolay Aleksandrov <nikolay@redhat.com> | 2013-10-02 11:39:24 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2013-10-03 19:36:37 (GMT) |
commit | 357afe9c46c951c34769e39cabdf8d1637e2eecc (patch) | |
tree | 4313ee038c1557c1aa36ec594a0aa20e545ca2df | |
parent | 5080546682bae3d32734b18e281091684f0ebbe4 (diff) | |
download | linux-fsl-qoriq-357afe9c46c951c34769e39cabdf8d1637e2eecc.tar.xz |
flow_dissector: factor out the ports extraction in skb_flow_get_ports
Factor out the code that extracts the ports from skb_flow_dissect and
add a new function skb_flow_get_ports which can be re-used.
Suggested-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | include/net/flow_keys.h | 1 | ||||
-rw-r--r-- | net/core/flow_dissector.c | 39 |
2 files changed, 29 insertions, 11 deletions
diff --git a/include/net/flow_keys.h b/include/net/flow_keys.h index ac2439d..7e64bd8 100644 --- a/include/net/flow_keys.h +++ b/include/net/flow_keys.h @@ -14,4 +14,5 @@ struct flow_keys { }; bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow); +__be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto); #endif diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index 8d7d0dd..f8e25ac 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -25,9 +25,35 @@ static void iph_to_flow_copy_addrs(struct flow_keys *flow, const struct iphdr *i memcpy(&flow->src, &iph->saddr, sizeof(flow->src) + sizeof(flow->dst)); } +/** + * skb_flow_get_ports - extract the upper layer ports and return them + * @skb: buffer to extract the ports from + * @thoff: transport header offset + * @ip_proto: protocol for which to get port offset + * + * The function will try to retrieve the ports at offset thoff + poff where poff + * is the protocol port offset returned from proto_ports_offset + */ +__be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto) +{ + int poff = proto_ports_offset(ip_proto); + + if (poff >= 0) { + __be32 *ports, _ports; + + ports = skb_header_pointer(skb, thoff + poff, + sizeof(_ports), &_ports); + if (ports) + return *ports; + } + + return 0; +} +EXPORT_SYMBOL(skb_flow_get_ports); + bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow) { - int poff, nhoff = skb_network_offset(skb); + int nhoff = skb_network_offset(skb); u8 ip_proto; __be16 proto = skb->protocol; @@ -150,16 +176,7 @@ ipv6: } flow->ip_proto = ip_proto; - poff = proto_ports_offset(ip_proto); - if (poff >= 0) { - __be32 *ports, _ports; - - ports = skb_header_pointer(skb, nhoff + poff, - sizeof(_ports), &_ports); - if (ports) - flow->ports = *ports; - } - + flow->ports = skb_flow_get_ports(skb, nhoff, ip_proto); flow->thoff = (u16) nhoff; return true; |