David Howells | be6e670 | 2016-04-04 14:00:32 +0100 | [diff] [blame] | 1 | /* Utility routines |
| 2 | * |
| 3 | * Copyright (C) 2015 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public Licence |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the Licence, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/ip.h> |
David Howells | d991b4a | 2016-06-29 14:40:39 +0100 | [diff] [blame^] | 13 | #include <linux/ipv6.h> |
David Howells | be6e670 | 2016-04-04 14:00:32 +0100 | [diff] [blame] | 14 | #include <linux/udp.h> |
| 15 | #include "ar-internal.h" |
| 16 | |
| 17 | /* |
| 18 | * Set up an RxRPC address from a socket buffer. |
| 19 | */ |
| 20 | void rxrpc_get_addr_from_skb(struct rxrpc_local *local, |
| 21 | const struct sk_buff *skb, |
| 22 | struct sockaddr_rxrpc *srx) |
| 23 | { |
| 24 | memset(srx, 0, sizeof(*srx)); |
| 25 | srx->transport_type = local->srx.transport_type; |
| 26 | srx->transport.family = local->srx.transport.family; |
| 27 | |
| 28 | /* Can we see an ipv4 UDP packet on an ipv6 UDP socket? and vice |
| 29 | * versa? |
| 30 | */ |
| 31 | switch (srx->transport.family) { |
| 32 | case AF_INET: |
| 33 | srx->transport.sin.sin_port = udp_hdr(skb)->source; |
| 34 | srx->transport_len = sizeof(struct sockaddr_in); |
| 35 | memcpy(&srx->transport.sin.sin_addr, &ip_hdr(skb)->saddr, |
| 36 | sizeof(struct in_addr)); |
| 37 | break; |
| 38 | |
| 39 | default: |
| 40 | BUG(); |
| 41 | } |
| 42 | } |
David Howells | d991b4a | 2016-06-29 14:40:39 +0100 | [diff] [blame^] | 43 | |
| 44 | /* |
| 45 | * Fill out a peer address from a socket buffer containing a packet. |
| 46 | */ |
| 47 | int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *srx, struct sk_buff *skb) |
| 48 | { |
| 49 | memset(srx, 0, sizeof(*srx)); |
| 50 | |
| 51 | switch (ntohs(skb->protocol)) { |
| 52 | case ETH_P_IP: |
| 53 | srx->transport_type = SOCK_DGRAM; |
| 54 | srx->transport_len = sizeof(srx->transport.sin); |
| 55 | srx->transport.sin.sin_family = AF_INET; |
| 56 | srx->transport.sin.sin_port = udp_hdr(skb)->source; |
| 57 | srx->transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; |
| 58 | return 0; |
| 59 | |
| 60 | case ETH_P_IPV6: |
| 61 | srx->transport_type = SOCK_DGRAM; |
| 62 | srx->transport_len = sizeof(srx->transport.sin6); |
| 63 | srx->transport.sin6.sin6_family = AF_INET6; |
| 64 | srx->transport.sin6.sin6_port = udp_hdr(skb)->source; |
| 65 | srx->transport.sin6.sin6_addr = ipv6_hdr(skb)->saddr; |
| 66 | return 0; |
| 67 | |
| 68 | default: |
| 69 | pr_warn_ratelimited("AF_RXRPC: Unknown eth protocol %u\n", |
| 70 | ntohs(skb->protocol)); |
| 71 | return -EAFNOSUPPORT; |
| 72 | } |
| 73 | } |