sock_alloc_send_skb

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Hi,
        why in sock_alloc_send_skb(sk,
                length+hh_len+15,0,flags&MSG_DONTWAIT, &err)

15 is added to the length of the the data of the socket. Here
length=data_len+ip_hdr+udp_hdr all we need is hrd_hdr ie hh_len which is
being added here, why that 15 is needed?

Sourav

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