/* Utility routines
   *
   * Copyright (C) 2015 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public Licence
   * as published by the Free Software Foundation; either version
   * 2 of the Licence, or (at your option) any later version.
   */
  
  #include <linux/ip.h>

  #include <linux/ipv6.h>

  #include <linux/udp.h>
  #include "ar-internal.h"
  
  /*

   * Fill out a peer address from a socket buffer containing a packet.
   */
  int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *srx, struct sk_buff *skb)
  {
  	memset(srx, 0, sizeof(*srx));
  
  	switch (ntohs(skb->protocol)) {
  	case ETH_P_IP:
  		srx->transport_type = SOCK_DGRAM;
  		srx->transport_len = sizeof(srx->transport.sin);
  		srx->transport.sin.sin_family = AF_INET;
  		srx->transport.sin.sin_port = udp_hdr(skb)->source;
  		srx->transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
  		return 0;

  #ifdef CONFIG_AF_RXRPC_IPV6

  	case ETH_P_IPV6:
  		srx->transport_type = SOCK_DGRAM;
  		srx->transport_len = sizeof(srx->transport.sin6);
  		srx->transport.sin6.sin6_family = AF_INET6;
  		srx->transport.sin6.sin6_port = udp_hdr(skb)->source;
  		srx->transport.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
  		return 0;

  #endif

  
  	default:
  		pr_warn_ratelimited("AF_RXRPC: Unknown eth protocol %u
  ",
  				    ntohs(skb->protocol));
  		return -EAFNOSUPPORT;
  	}
  }