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