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 } 45