netdev - patch for udp

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Date:	Sun, 19 Jul 2015 22:38:54 +0800
From:	Zhenwei Pi <p_ace@....com>
To:	netdev@...r.kernel.org
Subject: patch for udp_sendmsg

Dear Sirs,

Commit : the max length of udp msg is (0xFFFF - sizeof(struct udphdr) - 
sizeof(struct iphdr). return -EMSGSIZE in udp_sendmsg.
Patch : as the attached file

____________________________________________________________
| IP header |  UDP header | udp data ........                             |
|___________|______________|_________________________________|
|--> Total Length : 
0xffff                                                       <--|

If length of "data" is between (0xFFFF - sizeof(struct udphdr) - 
sizeof(struct iphdr) and 0xFFFF, sendto will fail because of ip_make_skb.
Should kernel return -EMSGSIZE as soon as possible ?

-- 
Zhenwei Pi
Rather than love ,than money ,than faith,than fame,than fairness,give me truth.

View attachment "diff" of type "text/plain" (294 bytes)

View attachment "udp.c" of type "text/x-csrc" (65268 bytes)

View attachment "udp.c.orig" of type "text/plain" (65219 bytes)