dccp: support for passing MSG_TRUNC
DCCP is datagram-oriented but lacks UDP's support for MSG_TRUNC as defined in recvmsg(2)/recv(2). Hence the following 'Hello world\0' receiver len = recv(fd, buf, 10, MSG_PEEK | MSG_TRUNC); wrongly (always) returns 10, while in UDP it returns 12 as expected. This patch adds the missing MSG_TRUNC support to recvmsg(). Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -835,6 +835,8 @@ verify_sock_status:
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len = -EFAULT;
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break;
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}
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if (flags & MSG_TRUNC)
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len = skb->len;
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found_fin_ok:
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if (!(flags & MSG_PEEK))
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sk_eat_skb(sk, skb, 0);
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