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  */
  16 int 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 }