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kumquat-buildroot/package/libmnl/0001-examples-add-rtnl-link-can.patch
Dario Binacchi 7731440881 package/libmnl: add rtnl-link-can example 
The iproute2 package requires MMU support, and the BusyBox "ip link"
command does not handle CAN interfaces. The rtnl-link-can application,
added by applying the upstream patch, allows for the use of CAN devices
even on such systems.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
2023-05-13 11:02:46 +02:00

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From 80442c4e32cde0b27b471c5c9688ee8488f14bec Mon Sep 17 00:00:00 2001
From: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Date: Thu, 20 Apr 2023 21:21:15 +0200
Subject: [PATCH] examples: add rtnl-link-can
I developed this application to test the Linux kernel series referenced below.
I could not use the iproute2 package since the microcontroller is without MMU.
On suggestion of the Linux CAN subsystem maintainer I decided to upstream it.
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://marc.info/?l=linux-netdev&m=167999323611710&w=2
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Upstream: https://git.netfilter.org/libmnl/commit/?id=80442c4e32cde0b27b471c5c9688ee8488f14bec
---
examples/rtnl/Makefile.am | 4 +
examples/rtnl/rtnl-link-can.c | 452 ++++++++++++++++++++++++++++++++++
2 files changed, 456 insertions(+)
create mode 100644 examples/rtnl/rtnl-link-can.c
diff --git a/examples/rtnl/Makefile.am b/examples/rtnl/Makefile.am
index dd8a77d914b6..5a28e0965926 100644
--- a/examples/rtnl/Makefile.am
+++ b/examples/rtnl/Makefile.am
@@ -2,6 +2,7 @@ include $(top_srcdir)/Make_global.am
check_PROGRAMS = rtnl-addr-add \
rtnl-addr-dump \
+ rtnl-link-can \
rtnl-link-dump rtnl-link-dump2 rtnl-link-dump3 \
rtnl-link-event \
rtnl-link-set \
@@ -13,6 +14,9 @@ check_PROGRAMS = rtnl-addr-add \
rtnl_addr_add_SOURCES = rtnl-addr-add.c
rtnl_addr_add_LDADD = ../../src/libmnl.la
+rtnl_link_can_SOURCES = rtnl-link-can.c
+rtnl_link_can_LDADD = ../../src/libmnl.la
+
rtnl_addr_dump_SOURCES = rtnl-addr-dump.c
rtnl_addr_dump_LDADD = ../../src/libmnl.la
diff --git a/examples/rtnl/rtnl-link-can.c b/examples/rtnl/rtnl-link-can.c
new file mode 100644
index 000000000000..8ed70d141475
--- /dev/null
+++ b/examples/rtnl/rtnl-link-can.c
@@ -0,0 +1,452 @@
+/* This example is placed in the public domain. */
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/can/netlink.h>
+#include <linux/if.h>
+#include <linux/if_link.h>
+#include <linux/rtnetlink.h>
+
+static void incomplete_command(void) __attribute__((noreturn));
+
+#define NEXT_ARG() \
+ do { \
+ if (argc <= 0) incomplete_command(); \
+ argv++; \
+ argc--; \
+ } while (0)
+
+static void duparg2(const char *key, const char *arg)
+{
+ fprintf(stderr,
+ "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n",
+ key, arg);
+ exit(-1);
+}
+
+static void incomplete_command(void)
+{
+ fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
+ exit(EXIT_FAILURE);
+}
+
+/* Returns false if 'prefix' is a not empty prefix of 'string'.
+ */
+static bool matches(const char *prefix, const char *string)
+{
+ if (!*prefix)
+ return true;
+
+ while (*string && *prefix == *string) {
+ prefix++;
+ string++;
+ }
+
+ return !!*prefix;
+}
+
+static int get_u16(__u16 *val, const char *arg, int base)
+{
+ unsigned long res;
+ char *ptr;
+
+ if (!arg || !*arg)
+ return -1;
+
+ res = strtoul(arg, &ptr, base);
+
+ /* empty string or trailing non-digits */
+ if (!ptr || ptr == arg || *ptr)
+ return -1;
+
+ /* overflow */
+ if (res == ULONG_MAX && errno == ERANGE)
+ return -1;
+
+ if (res > 0xFFFFUL)
+ return -1;
+
+ *val = res;
+ return 0;
+}
+
+static int get_u32(__u32 *val, const char *arg, int base)
+{
+ unsigned long res;
+ char *ptr;
+
+ if (!arg || !*arg)
+ return -1;
+
+ res = strtoul(arg, &ptr, base);
+
+ /* empty string or trailing non-digits */
+ if (!ptr || ptr == arg || *ptr)
+ return -1;
+
+ /* overflow */
+ if (res == ULONG_MAX && errno == ERANGE)
+ return -1;
+
+ /* in case UL > 32 bits */
+ if (res > 0xFFFFFFFFUL)
+ return -1;
+
+ *val = res;
+ return 0;
+}
+
+static int get_float(float *val, const char *arg)
+{
+ float res;
+ char *ptr;
+
+ if (!arg || !*arg)
+ return -1;
+
+ res = strtof(arg, &ptr);
+ if (!ptr || ptr == arg || *ptr)
+ return -1;
+
+ *val = res;
+ return 0;
+}
+
+static void set_ctrlmode(char *name, char *arg,
+ struct can_ctrlmode *cm, __u32 flags)
+{
+ if (strcmp(arg, "on") == 0) {
+ cm->flags |= flags;
+ } else if (strcmp(arg, "off") != 0) {
+ fprintf(stderr,
+ "Error: argument of \"%s\" must be \"on\" or \"off\", not \"%s\"\n",
+ name, arg);
+ exit(EXIT_FAILURE);
+ }
+
+ cm->mask |= flags;
+}
+
+static void invarg(const char *msg, const char *arg)
+{
+ fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
+ exit(-1);
+}
+
+static void print_usage(FILE *f)
+{
+ fprintf(f,
+ "Usage: ip link set DEVICE type can\n"
+ "\t[ bitrate BITRATE [ sample-point SAMPLE-POINT] ] |\n"
+ "\t[ tq TQ prop-seg PROP_SEG phase-seg1 PHASE-SEG1\n \t phase-seg2 PHASE-SEG2 [ sjw SJW ] ]\n"
+ "\n"
+ "\t[ dbitrate BITRATE [ dsample-point SAMPLE-POINT] ] |\n"
+ "\t[ dtq TQ dprop-seg PROP_SEG dphase-seg1 PHASE-SEG1\n \t dphase-seg2 PHASE-SEG2 [ dsjw SJW ] ]\n"
+ "\n"
+ "\t[ loopback { on | off } ]\n"
+ "\t[ listen-only { on | off } ]\n"
+ "\t[ triple-sampling { on | off } ]\n"
+ "\t[ one-shot { on | off } ]\n"
+ "\t[ berr-reporting { on | off } ]\n"
+ "\t[ fd { on | off } ]\n"
+ "\t[ fd-non-iso { on | off } ]\n"
+ "\t[ presume-ack { on | off } ]\n"
+ "\t[ cc-len8-dlc { on | off } ]\n"
+ "\n"
+ "\t[ restart-ms TIME-MS ]\n"
+ "\t[ restart ]\n"
+ "\n"
+ "\t[ termination { 0..65535 } ]\n"
+ "\n"
+ "\tWhere: BITRATE := { 1..1000000 }\n"
+ "\t SAMPLE-POINT := { 0.000..0.999 }\n"
+ "\t TQ := { NUMBER }\n"
+ "\t PROP-SEG := { 1..8 }\n"
+ "\t PHASE-SEG1 := { 1..8 }\n"
+ "\t PHASE-SEG2 := { 1..8 }\n"
+ "\t SJW := { 1..4 }\n"
+ "\t RESTART-MS := { 0 | NUMBER }\n"
+ );
+}
+
+static void usage(void)
+{
+ print_usage(stderr);
+}
+
+static int iplink_set_can_parse(int argc, char **argv, struct nlmsghdr *nlh)
+{
+ struct can_bittiming bt = {}, dbt = {};
+ struct can_ctrlmode cm = {};
+
+ while (argc > 0) {
+ if (matches(*argv, "bitrate") == 0) {
+ NEXT_ARG();
+ if (get_u32(&bt.bitrate, *argv, 0))
+ invarg("invalid \"bitrate\" value\n", *argv);
+ } else if (matches(*argv, "sample-point") == 0) {
+ float sp;
+
+ NEXT_ARG();
+ if (get_float(&sp, *argv))
+ invarg("invalid \"sample-point\" value\n",
+ *argv);
+
+ bt.sample_point = (__u32)(sp * 1000);
+ } else if (matches(*argv, "tq") == 0) {
+ NEXT_ARG();
+ if (get_u32(&bt.tq, *argv, 0))
+ invarg("invalid \"tq\" value\n", *argv);
+ } else if (matches(*argv, "prop-seg") == 0) {
+ NEXT_ARG();
+ if (get_u32(&bt.prop_seg, *argv, 0))
+ invarg("invalid \"prop-seg\" value\n", *argv);
+ } else if (matches(*argv, "phase-seg1") == 0) {
+ NEXT_ARG();
+ if (get_u32(&bt.phase_seg1, *argv, 0))
+ invarg("invalid \"phase-seg1\" value\n", *argv);
+ } else if (matches(*argv, "phase-seg2") == 0) {
+ NEXT_ARG();
+ if (get_u32(&bt.phase_seg2, *argv, 0))
+ invarg("invalid \"phase-seg2\" value\n", *argv);
+ } else if (matches(*argv, "sjw") == 0) {
+ NEXT_ARG();
+ if (get_u32(&bt.sjw, *argv, 0))
+ invarg("invalid \"sjw\" value\n", *argv);
+ } else if (matches(*argv, "dbitrate") == 0) {
+ NEXT_ARG();
+ if (get_u32(&dbt.bitrate, *argv, 0))
+ invarg("invalid \"dbitrate\" value\n", *argv);
+ } else if (matches(*argv, "dsample-point") == 0) {
+ float sp;
+
+ NEXT_ARG();
+ if (get_float(&sp, *argv))
+ invarg("invalid \"dsample-point\" value\n", *argv);
+ dbt.sample_point = (__u32)(sp * 1000);
+ } else if (matches(*argv, "dtq") == 0) {
+ NEXT_ARG();
+ if (get_u32(&dbt.tq, *argv, 0))
+ invarg("invalid \"dtq\" value\n", *argv);
+ } else if (matches(*argv, "dprop-seg") == 0) {
+ NEXT_ARG();
+ if (get_u32(&dbt.prop_seg, *argv, 0))
+ invarg("invalid \"dprop-seg\" value\n", *argv);
+ } else if (matches(*argv, "dphase-seg1") == 0) {
+ NEXT_ARG();
+ if (get_u32(&dbt.phase_seg1, *argv, 0))
+ invarg("invalid \"dphase-seg1\" value\n", *argv);
+ } else if (matches(*argv, "dphase-seg2") == 0) {
+ NEXT_ARG();
+ if (get_u32(&dbt.phase_seg2, *argv, 0))
+ invarg("invalid \"dphase-seg2\" value\n", *argv);
+ } else if (matches(*argv, "dsjw") == 0) {
+ NEXT_ARG();
+ if (get_u32(&dbt.sjw, *argv, 0))
+ invarg("invalid \"dsjw\" value\n", *argv);
+ } else if (matches(*argv, "loopback") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("loopback", *argv, &cm,
+ CAN_CTRLMODE_LOOPBACK);
+ } else if (matches(*argv, "listen-only") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("listen-only", *argv, &cm,
+ CAN_CTRLMODE_LISTENONLY);
+ } else if (matches(*argv, "triple-sampling") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("triple-sampling", *argv, &cm,
+ CAN_CTRLMODE_3_SAMPLES);
+ } else if (matches(*argv, "one-shot") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("one-shot", *argv, &cm,
+ CAN_CTRLMODE_ONE_SHOT);
+ } else if (matches(*argv, "berr-reporting") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("berr-reporting", *argv, &cm,
+ CAN_CTRLMODE_BERR_REPORTING);
+ } else if (matches(*argv, "fd") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("fd", *argv, &cm,
+ CAN_CTRLMODE_FD);
+ } else if (matches(*argv, "fd-non-iso") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("fd-non-iso", *argv, &cm,
+ CAN_CTRLMODE_FD_NON_ISO);
+ } else if (matches(*argv, "presume-ack") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("presume-ack", *argv, &cm,
+ CAN_CTRLMODE_PRESUME_ACK);
+#if defined(CAN_CTRLMODE_CC_LEN8_DLC)
+ } else if (matches(*argv, "cc-len8-dlc") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("cc-len8-dlc", *argv, &cm,
+ CAN_CTRLMODE_CC_LEN8_DLC);
+#endif
+ } else if (matches(*argv, "restart") == 0) {
+ __u32 val = 1;
+
+ mnl_attr_put(nlh, IFLA_CAN_RESTART, sizeof(val), &val);
+ } else if (matches(*argv, "restart-ms") == 0) {
+ __u32 val;
+
+ NEXT_ARG();
+ if (get_u32(&val, *argv, 0))
+ invarg("invalid \"restart-ms\" value\n", *argv);
+
+ mnl_attr_put(nlh, IFLA_CAN_RESTART_MS, sizeof(val), &val);
+ } else if (matches(*argv, "termination") == 0) {
+ __u16 val;
+
+ NEXT_ARG();
+ if (get_u16(&val, *argv, 0))
+ invarg("invalid \"termination\" value\n",
+ *argv);
+
+ mnl_attr_put(nlh, IFLA_CAN_TERMINATION, sizeof(val), &val);
+ } else {
+ fprintf(stderr, "unknown option \"%s\"\n", *argv);
+ usage();
+ return -1;
+ }
+
+ NEXT_ARG();
+ }
+
+ if (bt.bitrate || bt.tq)
+ mnl_attr_put(nlh, IFLA_CAN_BITTIMING, sizeof(bt), &bt);
+
+ if (cm.mask)
+ mnl_attr_put(nlh, IFLA_CAN_CTRLMODE, sizeof(cm), &cm);
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ struct mnl_socket *nl;
+ struct nlmsghdr *nlh;
+ struct ifinfomsg *ifm;
+ int ret;
+ unsigned int seq, portid;
+ struct nlattr *linkinfo, *data;
+ const char *signatures[] = {
+ "ip", "link", "set", ""
+ };
+ char *type = NULL;
+ char *dev = NULL;
+ int i;
+
+ NEXT_ARG();
+ for (i = 0; argc > 0 && signatures[i][0];) {
+ if (matches(*argv, signatures[i]))
+ incomplete_command();
+
+ NEXT_ARG();
+ i++;
+ }
+
+ if (argc == 0)
+ incomplete_command();
+
+ nlh = mnl_nlmsg_put_header(buf);
+ nlh->nlmsg_type = RTM_NEWLINK;
+ nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ nlh->nlmsg_seq = seq = time(NULL);
+ ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm));
+ ifm->ifi_family = AF_UNSPEC;
+ ifm->ifi_change = 0;
+ ifm->ifi_flags = 0;
+
+ while (argc > 0) {
+ if (matches(*argv, "up") == 0) {
+ ifm->ifi_change |= IFF_UP;
+ ifm->ifi_flags |= IFF_UP;
+ } else if (matches(*argv, "down") == 0) {
+ ifm->ifi_change |= IFF_UP;
+ ifm->ifi_flags &= ~IFF_UP;
+ } else if (matches(*argv, "type") == 0) {
+ NEXT_ARG();
+ type = *argv;
+ NEXT_ARG();
+ break;
+ } else if (matches(*argv, "help") == 0) {
+ usage();
+ exit(EXIT_FAILURE);
+ } else {
+ if (matches(*argv, "dev") == 0)
+ NEXT_ARG();
+
+ if (dev)
+ duparg2("dev", *argv);
+
+ dev = *argv;
+ }
+
+ NEXT_ARG();
+ }
+
+ if (dev)
+ mnl_attr_put_str(nlh, IFLA_IFNAME, dev);
+
+ if (type) {
+ if (matches(type, "can")) {
+ fprintf(stderr, "unknown type \"%s\"\n", type);
+ usage();
+ exit(EXIT_FAILURE);
+ }
+
+ linkinfo = mnl_attr_nest_start(nlh, IFLA_LINKINFO);
+ mnl_attr_put_str(nlh, IFLA_INFO_KIND, "can");
+ data = mnl_attr_nest_start(nlh, IFLA_INFO_DATA);
+
+ if (iplink_set_can_parse(argc, argv, nlh))
+ return -1;
+
+ mnl_attr_nest_end(nlh, data);
+ mnl_attr_nest_end(nlh, linkinfo);
+ }
+
+ nl = mnl_socket_open(NETLINK_ROUTE);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+
+ portid = mnl_socket_get_portid(nl);
+
+ mnl_nlmsg_fprintf(stdout, nlh, nlh->nlmsg_len,
+ sizeof(struct ifinfomsg));
+
+ if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+ perror("mnl_socket_sendto");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ if (ret == -1) {
+ perror("mnl_socket_recvfrom");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL);
+ if (ret == -1) {
+ perror("mnl_cb_run");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_socket_close(nl);
+
+ return 0;
+}
--
2.32.0
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