net/rxrpc/utils.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /* Utility routines
0003  *
0004  * Copyright (C) 2015 Red Hat, Inc. All Rights Reserved.
0005  * Written by David Howells (dhowells@redhat.com)
0006  */
0007
0008 #include <linux/ip.h>
0009 #include <linux/ipv6.h>
0010 #include <linux/udp.h>
0011 #include "ar-internal.h"
0012
0013 /*
0014  * Fill out a peer address from a socket buffer containing a packet.
0015  */
0016 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *srx, struct sk_buff *skb)
0017 {
0018     memset(srx, 0, sizeof(*srx));
0019
0020     switch (ntohs(skb->protocol)) {
0021     case ETH_P_IP:
0022         srx->transport_type = SOCK_DGRAM;
0023         srx->transport_len = sizeof(srx->transport.sin);
0024         srx->transport.sin.sin_family = AF_INET;
0025         srx->transport.sin.sin_port = udp_hdr(skb)->source;
0026         srx->transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
0027         return 0;
0028
0029 #ifdef CONFIG_AF_RXRPC_IPV6
0030     case ETH_P_IPV6:
0031         srx->transport_type = SOCK_DGRAM;
0032         srx->transport_len = sizeof(srx->transport.sin6);
0033         srx->transport.sin6.sin6_family = AF_INET6;
0034         srx->transport.sin6.sin6_port = udp_hdr(skb)->source;
0035         srx->transport.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
0036         return 0;
0037 #endif
0038
0039     default:
0040         pr_warn_ratelimited("AF_RXRPC: Unknown eth protocol %u\n",
0041                     ntohs(skb->protocol));
0042         return -EAFNOSUPPORT;
0043     }
0044 }