From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ralf Baechle Subject: [PATCH v2 3/6] NETROM: Add netrom_ntop implementation. Date: Sun, 19 Sep 2021 15:30:26 +0200 Message-ID: <1eb184007b7b07ad0d4c42cbd58be265eb3c67b7.1632059758.git.ralf@linux-mips.org> References: Return-path: In-Reply-To: List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Stephen Hemminger Cc: netdev@vger.kernel.org, linux-hams@vger.kernel.org NETROM uses AX.25 addresses so this is a simple wrapper around ax25_ntop1. Signed-off-by: Ralf Baechle --- Makefile | 3 +++ include/utils.h | 2 ++ lib/ax25_ntop.c | 22 +++++++++++++++------- lib/netrom_ntop.c | 23 +++++++++++++++++++++++ 4 files changed, 43 insertions(+), 7 deletions(-) create mode 100644 lib/netrom_ntop.c diff --git a/Makefile b/Makefile index 551f528b..df894d54 100644 --- a/Makefile +++ b/Makefile @@ -46,6 +46,9 @@ ADDLIB+=ax25_ntop.o #options for mpls ADDLIB+=mpls_ntop.o mpls_pton.o +#options for NETROM +ADDLIB+=netrom_ntop.o + CC := gcc HOSTCC ?= $(CC) DEFINES += -D_GNU_SOURCE diff --git a/include/utils.h b/include/utils.h index 947ab5c3..6ab2fa74 100644 --- a/include/utils.h +++ b/include/utils.h @@ -203,6 +203,8 @@ const char *ax25_ntop(int af, const void *addr, char *str, socklen_t len); const char *mpls_ntop(int af, const void *addr, char *str, size_t len); int mpls_pton(int af, const char *src, void *addr, size_t alen); +const char *netrom_ntop(int af, const void *addr, char *str, socklen_t len); + extern int __iproute2_hz_internal; int __get_hz(void); diff --git a/lib/ax25_ntop.c b/lib/ax25_ntop.c index 48098581..cfd0e04b 100644 --- a/lib/ax25_ntop.c +++ b/lib/ax25_ntop.c @@ -6,13 +6,22 @@ #include "utils.h" +const char *ax25_ntop1(const ax25_address *src, char *dst, socklen_t size); + /* * AX.25 addresses are based on Amateur radio callsigns followed by an SSID - * like XXXXXX-SS where the callsign is up to 6 characters which are either - * letters or digits and the SSID is a decimal number in the range 0..15. + * like XXXXXX-SS where the callsign consists of up to 6 ASCII characters + * which are either letters or digits and the SSID is a decimal number in the + * range 0..15. * Amateur radio callsigns are assigned by a country's relevant authorities * and are 3..6 characters though a few countries have assigned callsigns * longer than that. AX.25 is not able to handle such longer callsigns. + * There are further restrictions on the format of valid callsigns by + * applicable national and international law. Linux doesn't need to care and + * will happily accept anything that consists of 6 ASCII characters in the + * range of A-Z and 0-9 for a callsign such as the default AX.25 MAC address + * LINUX-1 and the default broadcast address QST-0. + * The SSID is just a number and not encoded in ASCII digits. * * Being based on HDLC AX.25 encodes addresses by shifting them one bit left * thus zeroing bit 0, the HDLC extension bit for all but the last bit of @@ -22,14 +31,13 @@ * Linux' internal representation of AX.25 addresses in Linux is very similar * to this on the on-air or on-the-wire format. The callsign is padded to * 6 octets by adding spaces, followed by the SSID octet then all 7 octets - * are left-shifted by one byte. + * are left-shifted by one bit. * - * This for example turns "LINUX-1" where the callsign is LINUX and SSID is 1 - * into 98:92:9c:aa:b0:40:02. + * For example, for the address "LINUX-1" the callsign is LINUX and SSID is 1 + * the internal format is 98:92:9c:aa:b0:40:02. */ -static const char *ax25_ntop1(const ax25_address *src, char *dst, - socklen_t size) +const char *ax25_ntop1(const ax25_address *src, char *dst, socklen_t size) { char c, *s; int n; diff --git a/lib/netrom_ntop.c b/lib/netrom_ntop.c new file mode 100644 index 00000000..3dd6cb0b --- /dev/null +++ b/lib/netrom_ntop.c @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include +#include +#include + +#include "utils.h" + +const char *ax25_ntop1(const ax25_address *src, char *dst, socklen_t size); + +const char *netrom_ntop(int af, const void *addr, char *buf, socklen_t buflen) +{ + switch (af) { + case AF_NETROM: + errno = 0; + return ax25_ntop1((ax25_address *)addr, buf, buflen); + + default: + errno = EAFNOSUPPORT; + } + + return NULL; +} -- 2.31.1