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

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

    $ ./tools/net/ynl/samples/rt-route
    oif: wlp0s20f3        gateway: 192.168.1.1
    oif: wlp0s20f3        dst: 192.168.1.0/24
    oif: vpn0             dst: fe80::/64
    oif: wlp0s20f3        dst: fe80::/64
    oif: wlp0s20f3        gateway: fe80::200:5eff:fe00:201

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20250410014658.782120-14-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/net/ynl/Makefile.deps b/tools/net/ynl/Makefile.deps
index e55d94211df6c67a15f8d3f65a4bf480d2ec5036..385783489f849578cf3fb96df8d33936247b2c0d 100644 (file)
--- a/tools/net/ynl/Makefile.deps
+++ b/tools/net/ynl/Makefile.deps
@@ -30,4 +30,5 @@ 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_rt-route:=$(call get_hdr_inc,__LINUX_RTNETLINK_H,rtnetlink.h)
 CFLAGS_tcp_metrics:=$(call get_hdr_inc,_LINUX_TCP_METRICS_H,tcp_metrics.h)

diff --git a/tools/net/ynl/generated/Makefile b/tools/net/ynl/generated/Makefile
index 67ce3b8988ef08d4cfd0d374e6fe2c67bbea9fdc..6603ad8d4ce114c5fcae1a9c83b57f3d47d50efe 100644 (file)
--- a/tools/net/ynl/generated/Makefile
+++ b/tools/net/ynl/generated/Makefile
@@ -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}) rt-addr
+GENS=$(patsubst $(SPECS_DIR)/%.yaml,%,${GENS_PATHS}) rt-addr rt-route
 SRCS=$(patsubst %,%-user.c,${GENS})
 HDRS=$(patsubst %,%-user.h,${GENS})
 OBJS=$(patsubst %,%-user.o,${GENS})

diff --git a/tools/net/ynl/samples/.gitignore b/tools/net/ynl/samples/.gitignore
index 2bc8721d61441dcb51663fbfd2f593aaa08ebb0c..7f9781cf532fd384a07116838426d884b3647cdc 100644 (file)
--- a/tools/net/ynl/samples/.gitignore
+++ b/tools/net/ynl/samples/.gitignore
@@ -4,3 +4,4 @@ netdev
 ovs
 page-pool
 rt-addr
+rt-route

diff --git a/tools/net/ynl/samples/rt-route.c b/tools/net/ynl/samples/rt-route.c
new file mode 100644 (file)
index 0000000..9d9c868
--- /dev/null
+++ b/tools/net/ynl/samples/rt-route.c
@@ -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-route-user.h"
+
+static void rt_route_print(struct rt_route_getroute_rsp *r)
+{
+       char ifname[IF_NAMESIZE];
+       char route_str[64];
+       const char *route;
+       const char *name;
+
+       /* Ignore local */
+       if (r->_hdr.rtm_table == RT_TABLE_LOCAL)
+               return;
+
+       if (r->_present.oif) {
+               name = if_indextoname(r->oif, ifname);
+               if (name)
+                       printf("oif: %-16s ", name);
+       }
+
+       if (r->_present.dst_len) {
+               route = inet_ntop(r->_hdr.rtm_family, r->dst,
+                                 route_str, sizeof(route_str));
+               printf("dst: %s/%d", route, r->_hdr.rtm_dst_len);
+       }
+
+       if (r->_present.gateway_len) {
+               route = inet_ntop(r->_hdr.rtm_family, r->gateway,
+                                 route_str, sizeof(route_str));
+               printf("gateway: %s ", route);
+       }
+
+       printf("\n");
+}
+
+int main(int argc, char **argv)
+{
+       struct rt_route_getroute_req_dump *req;
+       struct rt_route_getroute_list *rsp;
+       struct ynl_error yerr;
+       struct ynl_sock *ys;
+
+       ys = ynl_sock_create(&ynl_rt_route_family, &yerr);
+       if (!ys) {
+               fprintf(stderr, "YNL: %s\n", yerr.msg);
+               return 1;
+       }
+
+       req = rt_route_getroute_req_dump_alloc();
+       if (!req)
+               goto err_destroy;
+
+       rsp = rt_route_getroute_dump(ys, req);
+       rt_route_getroute_req_dump_free(req);
+       if (!rsp)
+               goto err_close;
+
+       if (ynl_dump_empty(rsp))
+               fprintf(stderr, "Error: no routeesses reported\n");
+       ynl_dump_foreach(rsp, route)
+               rt_route_print(route);
+       rt_route_getroute_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;
+}