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tools: ynl: generate code for rt-addr and add a sample

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YNL C can now generate code for simple classic netlink families.
Include rt-addr in the Makefile for generation and add a sample.

  $ ./tools/net/ynl/samples/rt-addr
              lo: 127.0.0.1
       wlp0s20f3: 192.168.1.101
              lo: ::
       wlp0s20f3: fe80::6385:be6:746e:8116
            vpn0: fe80::3597:d353:b5a7:66dd

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20250410014658.782120-13-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2025-04-09 18:46:57 -07:00
parent 882e7b1365
commit 29d34a4d78
4 changed files with 84 additions and 2 deletions
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1
tools/net/ynl/Makefile.deps
View file

@ -29,4 +29,5 @@ CFLAGS_nfsd:=$(call get_hdr_inc,_LINUX_NFSD_NETLINK_H,nfsd_netlink.h)
CFLAGS_ovs_datapath:=$(call get_hdr_inc,__LINUX_OPENVSWITCH_H,openvswitch.h)
CFLAGS_ovs_flow:=$(call get_hdr_inc,__LINUX_OPENVSWITCH_H,openvswitch.h)
CFLAGS_ovs_vport:=$(call get_hdr_inc,__LINUX_OPENVSWITCH_H,openvswitch.h)
CFLAGS_rt-addr:=$(call get_hdr_inc,__LINUX_RTNETLINK_H,rtnetlink.h)
CFLAGS_tcp_metrics:=$(call get_hdr_inc,_LINUX_TCP_METRICS_H,tcp_metrics.h)

2
tools/net/ynl/generated/Makefile
View file

@ -25,7 +25,7 @@ SPECS_DIR:=../../../../Documentation/netlink/specs
GENS_PATHS=$(shell grep -nrI --files-without-match \
'protocol: netlink' \
$(SPECS_DIR))
GENS=$(patsubst $(SPECS_DIR)/%.yaml,%,${GENS_PATHS})
GENS=$(patsubst $(SPECS_DIR)/%.yaml,%,${GENS_PATHS}) rt-addr
SRCS=$(patsubst %,%-user.c,${GENS})
HDRS=$(patsubst %,%-user.h,${GENS})
OBJS=$(patsubst %,%-user.o,${GENS})

3
tools/net/ynl/samples/.gitignore vendored
View file

@ -2,4 +2,5 @@ ethtool
devlink
netdev
ovs
page-pool
page-pool
rt-addr

80
tools/net/ynl/samples/rt-addr.c Normal file
View file

@ -0,0 +1,80 @@
// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <string.h>
#include <ynl.h>
#include <arpa/inet.h>
#include <net/if.h>
#include "rt-addr-user.h"
static void rt_addr_print(struct rt_addr_getaddr_rsp *a)
{
char ifname[IF_NAMESIZE];
char addr_str[64];
const char *addr;
const char *name;
name = if_indextoname(a->_hdr.ifa_index, ifname);
if (name)
printf("%16s: ", name);
switch (a->_present.address_len) {
case 4:
addr = inet_ntop(AF_INET, a->address,
addr_str, sizeof(addr_str));
break;
case 16:
addr = inet_ntop(AF_INET6, a->address,
addr_str, sizeof(addr_str));
break;
default:
addr = NULL;
break;
}
if (addr)
printf("%s", addr);
else
printf("[%d]", a->_present.address_len);
printf("\n");
}
int main(int argc, char **argv)
{
struct rt_addr_getaddr_list *rsp;
struct rt_addr_getaddr_req *req;
struct ynl_error yerr;
struct ynl_sock *ys;
ys = ynl_sock_create(&ynl_rt_addr_family, &yerr);
if (!ys) {
fprintf(stderr, "YNL: %s\n", yerr.msg);
return 1;
}
req = rt_addr_getaddr_req_alloc();
if (!req)
goto err_destroy;
rsp = rt_addr_getaddr_dump(ys, req);
rt_addr_getaddr_req_free(req);
if (!rsp)
goto err_close;
if (ynl_dump_empty(rsp))
fprintf(stderr, "Error: no addresses reported\n");
ynl_dump_foreach(rsp, addr)
rt_addr_print(addr);
rt_addr_getaddr_list_free(rsp);
ynl_sock_destroy(ys);
return 0;
err_close:
fprintf(stderr, "YNL: %s\n", ys->err.msg);
err_destroy:
ynl_sock_destroy(ys);
return 2;
}