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Message-Id: <20170527233450.58015-2-dsahern@gmail.com>
Date: Sat, 27 May 2017 17:34:47 -0600
From: David Ahern <dsahern@...il.com>
To: netdev@...r.kernel.org, stephen@...workplumber.org
Cc: David Ahern <dsahern@...il.com>
Subject: [PATCH iproute2 1/4] ip address: Export ip_linkaddr_list
ipaddr_list_flush_or_save generates a list of nlmsg's for links and
optionally for addresses. Move the code into ip_linkaddr_list and
export it along with the supporting infrastructure.
API to use this function is:
struct nlmsg_chain linfo = { NULL, NULL};
struct nlmsg_chain ainfo = { NULL, NULL};
ip_linkaddr_list(family, filter_req, &linfo, &ainfo);
... error checking and code looping over linfo/ainfo ...
free_nlmsg_chain(&linfo);
free_nlmsg_chain(&ainfo);
Signed-off-by: David Ahern <dsahern@...il.com>
---
include/libnetlink.h | 10 ++++++
ip/ip_common.h | 4 +++
ip/ipaddress.c | 87 +++++++++++++++++++++++++++++-----------------------
3 files changed, 63 insertions(+), 38 deletions(-)
diff --git a/include/libnetlink.h b/include/libnetlink.h
index c43ab0a2d9d9..643c3bc56929 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -25,6 +25,16 @@ struct rtnl_handle {
int flags;
};
+struct nlmsg_list {
+ struct nlmsg_list *next;
+ struct nlmsghdr h;
+};
+
+struct nlmsg_chain {
+ struct nlmsg_list *head;
+ struct nlmsg_list *tail;
+};
+
extern int rcvbuf;
int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
diff --git a/ip/ip_common.h b/ip/ip_common.h
index 202fc399e61a..450b45ac2b60 100644
--- a/ip/ip_common.h
+++ b/ip/ip_common.h
@@ -65,6 +65,10 @@ int do_seg6(int argc, char **argv);
int iplink_get(unsigned int flags, char *name, __u32 filt_mask);
int iplink_ifla_xstats(int argc, char **argv);
+int ip_linkaddr_list(int family, req_filter_fn_t filter_fn,
+ struct nlmsg_chain *linfo, struct nlmsg_chain *ainfo);
+void free_nlmsg_chain(struct nlmsg_chain *info);
+
static inline int rtm_get_table(struct rtmsg *r, struct rtattr **tb)
{
__u32 table = r->rtm_table;
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index b8d9c7d917fe..c805b929134d 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -1211,16 +1211,6 @@ int print_addrinfo(const struct sockaddr_nl *who, struct nlmsghdr *n,
return 0;
}
-struct nlmsg_list {
- struct nlmsg_list *next;
- struct nlmsghdr h;
-};
-
-struct nlmsg_chain {
- struct nlmsg_list *head;
- struct nlmsg_list *tail;
-};
-
static int print_selected_addrinfo(struct ifinfomsg *ifi,
struct nlmsg_list *ainfo, FILE *fp)
{
@@ -1371,7 +1361,7 @@ static int ipaddr_restore(void)
exit(rtnl_from_file(stdin, &restore_handler, NULL));
}
-static void free_nlmsg_chain(struct nlmsg_chain *info)
+void free_nlmsg_chain(struct nlmsg_chain *info)
{
struct nlmsg_list *l, *n;
@@ -1534,10 +1524,43 @@ static int iplink_filter_req(struct nlmsghdr *nlh, int reqlen)
return 0;
}
+/* fills in linfo with link data and optionally ainfo with address info
+ * caller can walk lists as desired and must call free_nlmsg_chain for
+ * both when done
+ */
+int ip_linkaddr_list(int family, req_filter_fn_t filter_fn,
+ struct nlmsg_chain *linfo, struct nlmsg_chain *ainfo)
+{
+ if (rtnl_wilddump_req_filter_fn(&rth, preferred_family, RTM_GETLINK,
+ filter_fn) < 0) {
+ perror("Cannot send dump request");
+ return 1;
+ }
+
+ if (rtnl_dump_filter(&rth, store_nlmsg, linfo) < 0) {
+ fprintf(stderr, "Dump terminated\n");
+ return 1;
+ }
+
+ if (ainfo) {
+ if (rtnl_wilddump_request(&rth, family, RTM_GETADDR) < 0) {
+ perror("Cannot send dump request");
+ return 1;
+ }
+
+ if (rtnl_dump_filter(&rth, store_nlmsg, ainfo) < 0) {
+ fprintf(stderr, "Dump terminated\n");
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
{
struct nlmsg_chain linfo = { NULL, NULL};
- struct nlmsg_chain ainfo = { NULL, NULL};
+ struct nlmsg_chain _ainfo = { NULL, NULL}, *ainfo = NULL;
struct nlmsg_list *l;
char *filter_dev = NULL;
int no_link = 0;
@@ -1714,33 +1737,19 @@ static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
exit(0);
}
- if (rtnl_wilddump_req_filter_fn(&rth, preferred_family, RTM_GETLINK,
- iplink_filter_req) < 0) {
- perror("Cannot send dump request");
- exit(1);
- }
-
- if (rtnl_dump_filter(&rth, store_nlmsg, &linfo) < 0) {
- fprintf(stderr, "Dump terminated\n");
- exit(1);
- }
-
if (filter.family != AF_PACKET) {
+ ainfo = &_ainfo;
+
if (filter.oneline)
no_link = 1;
+ }
- if (rtnl_wilddump_request(&rth, filter.family, RTM_GETADDR) < 0) {
- perror("Cannot send dump request");
- exit(1);
- }
-
- if (rtnl_dump_filter(&rth, store_nlmsg, &ainfo) < 0) {
- fprintf(stderr, "Dump terminated\n");
- exit(1);
- }
+ if (ip_linkaddr_list(filter.family, iplink_filter_req,
+ &linfo, ainfo) != 0)
+ goto out;
- ipaddr_filter(&linfo, &ainfo);
- }
+ if (filter.family != AF_PACKET)
+ ipaddr_filter(&linfo, ainfo);
for (l = linfo.head; l; l = l->next) {
int res = 0;
@@ -1750,20 +1759,22 @@ static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
if (print_linkinfo_brief(NULL, &l->h, stdout) == 0)
if (filter.family != AF_PACKET)
print_selected_addrinfo(ifi,
- ainfo.head,
+ ainfo->head,
stdout);
} else if (no_link ||
- (res = print_linkinfo(NULL, &l->h, stdout)) >= 0) {
+ (res = print_linkinfo(NULL, &l->h, stdout)) >= 0) {
if (filter.family != AF_PACKET)
print_selected_addrinfo(ifi,
- ainfo.head, stdout);
+ ainfo->head, stdout);
if (res > 0 && !do_link && show_stats)
print_link_stats(stdout, &l->h);
}
}
fflush(stdout);
- free_nlmsg_chain(&ainfo);
+out:
+ if (ainfo)
+ free_nlmsg_chain(ainfo);
free_nlmsg_chain(&linfo);
return 0;
--
2.11.0 (Apple Git-81)
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