LXR linux/net/rxrpc/utils.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* Utility routines
   3 *
   4 * Copyright (C) 2015 Red Hat, Inc. All Rights Reserved.
   5 * Written by David Howells (dhowells@redhat.com)
   6 */
   7
   8#include <linux/ip.h>
   9#include <linux/ipv6.h>
  10#include <linux/udp.h>
  11#include "ar-internal.h"
  12
  13/*
  14 * Fill out a peer address from a socket buffer containing a packet.
  15 */
  16int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *srx, struct sk_buff *skb)
  17{
  18        memset(srx, 0, sizeof(*srx));
  19
  20        switch (ntohs(skb->protocol)) {
  21        case ETH_P_IP:
  22                srx->transport_type = SOCK_DGRAM;
  23                srx->transport_len = sizeof(srx->transport.sin);
  24                srx->transport.sin.sin_family = AF_INET;
  25                srx->transport.sin.sin_port = udp_hdr(skb)->source;
  26                srx->transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
  27                return 0;
  28
  29#ifdef CONFIG_AF_RXRPC_IPV6
  30        case ETH_P_IPV6:
  31                srx->transport_type = SOCK_DGRAM;
  32                srx->transport_len = sizeof(srx->transport.sin6);
  33                srx->transport.sin6.sin6_family = AF_INET6;
  34                srx->transport.sin6.sin6_port = udp_hdr(skb)->source;
  35                srx->transport.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
  36                return 0;
  37#endif
  38
  39        default:
  40                pr_warn_ratelimited("AF_RXRPC: Unknown eth protocol %u\n",
  41                                    ntohs(skb->protocol));
  42                return -EAFNOSUPPORT;
  43        }
  44}
  45