From: Yotam Gigi <yot...@mellanox.com>
Add the ife_packet_info_pack function which encodes some informative
metadata into a packet using the ife encapsulation. The informative
metadata consists of:
- The packet input/output ifindices
- The packet original size, in case it was truncated
This method is useful for anyone that wants to pass informative metadata
on a packet alongside with the packet itself. A good usage can be packet
sampling.
Signed-off-by: Yotam Gigi <yot...@mellanox.com>
Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
include/net/ife.h | 10 ++++++++++
net/ife/ife.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 55 insertions(+)
diff --git a/include/net/ife.h b/include/net/ife.h
index a75d4e0..5fbcfb3 100644
--- a/include/net/ife.h
+++ b/include/net/ife.h
@@ -18,6 +18,9 @@ int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen,
void *ife_tlv_meta_next(void *skbdata);
+struct ethhdr *ife_packet_info_pack(struct sk_buff *skb, int orig_size,
+ int in_ifindex, int out_ifindex);
+
#else
static inline void *ife_encode(struct sk_buff *skb, u16 metalen)
@@ -47,6 +50,13 @@ static inline void *ife_tlv_meta_next(void *skbdata)
return NULL;
}
+static inline struct ethhdr *
+ife_packet_info_pack(struct sk_buff *skb, int orig_size, int in_ifindex,
+ int out_ifindex)
+{
+ return NULL;
+}
+
#endif
#endif /* __NET_IFE_H */
diff --git a/net/ife/ife.c b/net/ife/ife.c
index ee3221a..756af46 100644
--- a/net/ife/ife.c
+++ b/net/ife/ife.c
@@ -138,6 +138,51 @@ int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16
dlen, const void *dval)
}
EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
+struct ethhdr *ife_packet_info_pack(struct sk_buff *skb, int orig_size,
+ int in_ifindex, int out_ifindex)
+{
+ int curr_size;
+ void *ifetlv;
+ u16 metalen;
+
+ curr_size = skb->len;
+
+ metalen = nla_total_size(sizeof(orig_size)) +
+ nla_total_size(sizeof(curr_size));
+
+ if (in_ifindex)
+ metalen += nla_total_size(sizeof(in_ifindex));
+ if (out_ifindex)
+ metalen += nla_total_size(sizeof(out_ifindex));
+
+ in_ifindex = htonl(in_ifindex);
+ out_ifindex = htonl(out_ifindex);
+ orig_size = htonl(orig_size);
+ curr_size = htonl(curr_size);
+
+ ifetlv = ife_encode(skb, metalen);
+ if (!ifetlv)
+ return NULL;
+
+ if (in_ifindex)
+ ifetlv += ife_tlv_meta_encode(ifetlv, IFE_META_IN_IFINDEX,
+ sizeof(in_ifindex), &in_ifindex);
+
+ if (out_ifindex)
+ ifetlv += ife_tlv_meta_encode(ifetlv, IFE_META_OUT_IFINDEX,
+ sizeof(out_ifindex),
+ &out_ifindex);
+
+ ifetlv += ife_tlv_meta_encode(ifetlv, IFE_META_ORIGSIZE,
+ sizeof(orig_size), &orig_size);
+
+ ifetlv += ife_tlv_meta_encode(ifetlv, IFE_META_SIZE,
+ sizeof(curr_size), &curr_size);
+
+ return (struct ethhdr *) skb->data;
+}
+EXPORT_SYMBOL(ife_packet_info_pack);
+
MODULE_AUTHOR("Jamal Hadi Salim <j...@mojatatu.com>");
MODULE_AUTHOR("Yotam Gigi <yot...@mellanox.com>");
MODULE_DESCRIPTION("Inter-FE LFB action");
--
2.7.4
