batadv_check_unicast_packet() is changed to return a value based on the reason to drop the packet, which will be useful information for future users of batadv_check_unicast_packet().

--- v2: * Changed return values to defined error codes. * Send as separate patch

v3: * Fixed typo in kernel doc

Signed-off-by: Martin Hundebøll martin@hundeboll.net --- routing.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/routing.c b/routing.c index 60ba03f..b070163 100644 --- a/routing.c +++ b/routing.c @@ -550,27 +550,37 @@ batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, return router; }

+/** + * batadv_check_unicast_packet - Check for malformed unicast packets + * @skb: packet to check + * @hdr_size: size of header to pull + * + * Check for short header and bad addresses in given packet. Returns negative + * value when check fails and 0 otherwise. The negative value depends on the + * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, + * and -EREMOTE for non-local (other host) destination. + */ static int batadv_check_unicast_packet(struct sk_buff *skb, int hdr_size) { struct ethhdr *ethhdr;

/* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) - return -1; + return -ENODATA;

ethhdr = (struct ethhdr *)skb_mac_header(skb);

/* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) - return -1; + return -EBADR;

/* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) - return -1; + return -EBADR;

/* not for me */ if (!batadv_is_my_mac(ethhdr->h_dest)) - return -1; + return -EREMOTE;

return 0; }