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Date: Fri, 23 Sep 2022 12:20:00 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: netdev@...r.kernel.org
Cc: David Ahern <dsahern@...nel.org>,
Stephen Hemminger <stephen@...workplumber.org>,
Guillaume Nault <gnault@...hat.com>,
Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH iproute2-next] rtnetlink: add new function rtnl_echo_talk()
Add a new function rtnl_echo_talk() that could be used when the
sub-component supports NLM_F_ECHO flag. With this function we can
remove the redundant code added by commit b264b4c6568c7 ("ip: add
NLM_F_ECHO support").
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
include/libnetlink.h | 4 ++++
include/utils.h | 1 -
ip/ipaddress.c | 24 +-----------------------
ip/iplink.c | 20 +-------------------
ip/ipnexthop.c | 23 +----------------------
ip/iproute.c | 24 +-----------------------
ip/iprule.c | 24 +-----------------------
lib/libnetlink.c | 31 +++++++++++++++++++++++++++++++
8 files changed, 40 insertions(+), 111 deletions(-)
diff --git a/include/libnetlink.h b/include/libnetlink.h
index a7b0f352..e9125f04 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -44,6 +44,7 @@ struct ipstats_req {
};
extern int rcvbuf;
+extern int echo_request;
int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
__attribute__((warn_unused_result));
@@ -171,6 +172,9 @@ int rtnl_dump_filter_errhndlr_nc(struct rtnl_handle *rth,
#define rtnl_dump_filter_errhndlr(rth, filter, farg, errhndlr, earg) \
rtnl_dump_filter_errhndlr_nc(rth, filter, farg, errhndlr, earg, 0)
+int rtnl_echo_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
+ int (*print_info)(struct nlmsghdr *n, void *arg))
+ __attribute__((warn_unused_result));
int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
struct nlmsghdr **answer)
__attribute__((warn_unused_result));
diff --git a/include/utils.h b/include/utils.h
index 2eb80b3e..eeb23a64 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -36,7 +36,6 @@ extern int max_flush_loops;
extern int batch_mode;
extern int numeric;
extern bool do_all;
-extern int echo_request;
#ifndef CONFDIR
#define CONFDIR "/etc/iproute2"
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 986cfbc3..89acfeaa 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -2422,11 +2422,6 @@ static int ipaddr_modify(int cmd, int flags, int argc, char **argv)
__u32 preferred_lft = INFINITY_LIFE_TIME;
__u32 valid_lft = INFINITY_LIFE_TIME;
unsigned int ifa_flags = 0;
- struct nlmsghdr *answer;
- int ret;
-
- if (echo_request)
- req.n.nlmsg_flags |= NLM_F_ECHO | NLM_F_ACK;
while (argc > 0) {
if (strcmp(*argv, "peer") == 0 ||
@@ -2608,24 +2603,7 @@ static int ipaddr_modify(int cmd, int flags, int argc, char **argv)
return -1;
}
- if (echo_request)
- ret = rtnl_talk(&rth, &req.n, &answer);
- else
- ret = rtnl_talk(&rth, &req.n, NULL);
-
- if (ret < 0)
- return -2;
-
- if (echo_request) {
- new_json_obj(json);
- open_json_object(NULL);
- print_addrinfo(answer, stdout);
- close_json_object();
- delete_json_obj();
- free(answer);
- }
-
- return 0;
+ return rtnl_echo_talk(&rth, &req.n, print_addrinfo);
}
int do_ipaddr(int argc, char **argv)
diff --git a/ip/iplink.c b/ip/iplink.c
index ad22f2d7..2b8602e4 100644
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -1073,16 +1073,12 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
.n.nlmsg_type = cmd,
.i.ifi_family = preferred_family,
};
- struct nlmsghdr *answer;
int ret;
ret = iplink_parse(argc, argv, &req, &type);
if (ret < 0)
return ret;
- if (echo_request)
- req.n.nlmsg_flags |= NLM_F_ECHO | NLM_F_ACK;
-
if (type) {
struct link_util *lu;
struct rtattr *linkinfo;
@@ -1127,23 +1123,9 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
return -1;
}
- if (echo_request)
- ret = rtnl_talk(&rth, &req.n, &answer);
- else
- ret = rtnl_talk(&rth, &req.n, NULL);
-
- if (ret < 0)
+ if(rtnl_echo_talk(&rth, &req.n, print_linkinfo) < 0)
return -2;
- if (echo_request) {
- new_json_obj(json);
- open_json_object(NULL);
- print_linkinfo(answer, stdout);
- close_json_object();
- delete_json_obj();
- free(answer);
- }
-
/* remove device from cache; next use can refresh with new data */
ll_drop_by_index(req.i.ifi_index);
diff --git a/ip/ipnexthop.c b/ip/ipnexthop.c
index 59f8f2fb..6da44414 100644
--- a/ip/ipnexthop.c
+++ b/ip/ipnexthop.c
@@ -921,10 +921,6 @@ static int ipnh_modify(int cmd, unsigned int flags, int argc, char **argv)
};
struct nlmsghdr *answer;
__u32 nh_flags = 0;
- int ret;
-
- if (echo_request)
- req.n.nlmsg_flags |= NLM_F_ECHO | NLM_F_ACK;
while (argc > 0) {
if (!strcmp(*argv, "id")) {
@@ -1004,24 +1000,7 @@ static int ipnh_modify(int cmd, unsigned int flags, int argc, char **argv)
req.nhm.nh_flags = nh_flags;
- if (echo_request)
- ret = rtnl_talk(&rth, &req.n, &answer);
- else
- ret = rtnl_talk(&rth, &req.n, NULL);
-
- if (ret < 0)
- return -2;
-
- if (echo_request) {
- new_json_obj(json);
- open_json_object(NULL);
- print_nexthop_nocache(answer, (void *)stdout);
- close_json_object();
- delete_json_obj();
- free(answer);
- }
-
- return 0;
+ return rtnl_echo_talk(&rth, &req.n, print_nexthop_nocache);
}
static int ipnh_get_id(__u32 id)
diff --git a/ip/iproute.c b/ip/iproute.c
index 4774aac0..aefc884b 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -1123,7 +1123,6 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
};
char mxbuf[256];
struct rtattr *mxrta = (void *)mxbuf;
- struct nlmsghdr *answer;
unsigned int mxlock = 0;
char *d = NULL;
int gw_ok = 0;
@@ -1134,7 +1133,6 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
int raw = 0;
int type_ok = 0;
__u32 nhid = 0;
- int ret;
if (cmd != RTM_DELROUTE) {
req.r.rtm_protocol = RTPROT_BOOT;
@@ -1142,9 +1140,6 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
req.r.rtm_type = RTN_UNICAST;
}
- if (echo_request)
- req.n.nlmsg_flags |= NLM_F_ECHO | NLM_F_ACK;
-
mxrta->rta_type = RTA_METRICS;
mxrta->rta_len = RTA_LENGTH(0);
@@ -1591,24 +1586,7 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
if (!type_ok && req.r.rtm_family == AF_MPLS)
req.r.rtm_type = RTN_UNICAST;
- if (echo_request)
- ret = rtnl_talk(&rth, &req.n, &answer);
- else
- ret = rtnl_talk(&rth, &req.n, NULL);
-
- if (ret < 0)
- return -2;
-
- if (echo_request) {
- new_json_obj(json);
- open_json_object(NULL);
- print_route(answer, (void *)stdout);
- close_json_object();
- delete_json_obj();
- free(answer);
- }
-
- return 0;
+ return rtnl_echo_talk(&rth, &req.n, print_route);
}
static int iproute_flush_cache(void)
diff --git a/ip/iprule.c b/ip/iprule.c
index af77e62c..67058b9b 100644
--- a/ip/iprule.c
+++ b/ip/iprule.c
@@ -787,11 +787,6 @@ static int iprule_modify(int cmd, int argc, char **argv)
.frh.family = preferred_family,
.frh.action = FR_ACT_UNSPEC,
};
- struct nlmsghdr *answer;
- int ret;
-
- if (echo_request)
- req.n.nlmsg_flags |= NLM_F_ECHO | NLM_F_ACK;
if (cmd == RTM_NEWRULE) {
if (argc == 0) {
@@ -1021,24 +1016,7 @@ static int iprule_modify(int cmd, int argc, char **argv)
if (!table_ok && cmd == RTM_NEWRULE)
req.frh.table = RT_TABLE_MAIN;
- if (echo_request)
- ret = rtnl_talk(&rth, &req.n, &answer);
- else
- ret = rtnl_talk(&rth, &req.n, NULL);
-
- if (ret < 0)
- return -2;
-
- if (echo_request) {
- new_json_obj(json);
- open_json_object(NULL);
- print_rule(answer, stdout);
- close_json_object();
- delete_json_obj();
- free(answer);
- }
-
- return 0;
+ return rtnl_echo_talk(&rth, &req.n, print_rule);
}
int do_iprule(int argc, char **argv)
diff --git a/lib/libnetlink.c b/lib/libnetlink.c
index c27627fe..00feb69b 100644
--- a/lib/libnetlink.c
+++ b/lib/libnetlink.c
@@ -42,7 +42,9 @@
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
+int json;
int rcvbuf = 1024 * 1024;
+int echo_request = 0;
#ifdef HAVE_LIBMNL
#include <libmnl/libmnl.h>
@@ -1139,6 +1141,35 @@ static int __rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
return __rtnl_talk_iov(rtnl, &iov, 1, answer, show_rtnl_err, errfn);
}
+int rtnl_echo_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
+ int (*print_info)(struct nlmsghdr *n, void *arg))
+{
+ struct nlmsghdr *answer;
+ int ret;
+
+ if (echo_request)
+ n->nlmsg_flags |= NLM_F_ECHO | NLM_F_ACK;
+
+ if (echo_request)
+ ret = rtnl_talk(rtnl, n, &answer);
+ else
+ ret = rtnl_talk(rtnl, n, NULL);
+
+ if (ret < 0)
+ return -2;
+
+ if (echo_request) {
+ new_json_obj(json);
+ open_json_object(NULL);
+ print_info(answer, stdout);
+ close_json_object();
+ delete_json_obj();
+ free(answer);
+ }
+
+ return 0;
+}
+
int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
struct nlmsghdr **answer)
{
--
2.37.2
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