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Date: Sat, 25 Feb 2017 18:39:27 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Zaboj Campula <zaboj.campula@...t.cz>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH] iproute2: show network device dependency tree
Sat, Feb 25, 2017 at 05:59:00PM CET, zaboj.campula@...t.cz wrote:
>Add the argument '-tree' to ip-link to show network devices dependency tree.
>
>Example:
>
>$ ip -tree link
>eth0
> bond0
>eth1
> bond0
>eth2
> bond1
>eth3
> bond1
Hmm, what is this good for? I'm probably missing something...
>
>Signed-off-by: Zaboj Campula <zaboj.campula@...t.cz>
>---
> include/utils.h | 1 +
> ip/ip.c | 5 ++-
> ip/ipaddress.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++---------
> 3 files changed, 87 insertions(+), 16 deletions(-)
>
>diff --git a/include/utils.h b/include/utils.h
>index 22369e0..f1acf4d 100644
>--- a/include/utils.h
>+++ b/include/utils.h
>@@ -20,6 +20,7 @@ extern int show_raw;
> extern int resolve_hosts;
> extern int oneline;
> extern int brief;
>+extern int tree;;
> extern int timestamp;
> extern int timestamp_short;
> extern const char * _SL_;
>diff --git a/ip/ip.c b/ip/ip.c
>index 07050b0..29747a5 100644
>--- a/ip/ip.c
>+++ b/ip/ip.c
>@@ -33,6 +33,7 @@ int show_details;
> int resolve_hosts;
> int oneline;
> int brief;
>+int tree;
> int timestamp;
> const char *_SL_;
> int force;
>@@ -57,7 +58,7 @@ static void usage(void)
> " -h[uman-readable] | -iec |\n"
> " -f[amily] { inet | inet6 | ipx | dnet | mpls | bridge | link } |\n"
> " -4 | -6 | -I | -D | -B | -0 |\n"
>-" -l[oops] { maximum-addr-flush-attempts } | -br[ief] |\n"
>+" -l[oops] { maximum-addr-flush-attempts } | -br[ief] | -tr[ee] |\n"
> " -o[neline] | -t[imestamp] | -ts[hort] | -b[atch] [filename] |\n"
> " -rc[vbuf] [size] | -n[etns] name | -a[ll] | -c[olor]}\n");
> exit(-1);
>@@ -257,6 +258,8 @@ int main(int argc, char **argv)
> batch_file = argv[1];
> } else if (matches(opt, "-brief") == 0) {
> ++brief;
>+ } else if (matches(opt, "-tree") == 0) {
>+ ++tree;
> } else if (matches(opt, "-rcvbuf") == 0) {
> unsigned int size;
>
>diff --git a/ip/ipaddress.c b/ip/ipaddress.c
>index 242c6ea..5ebcb1a 100644
>--- a/ip/ipaddress.c
>+++ b/ip/ipaddress.c
>@@ -1534,6 +1534,69 @@ static int iplink_filter_req(struct nlmsghdr *nlh, int reqlen)
> return 0;
> }
>
>+static int has_master(struct nlmsg_chain *linfo, int index)
>+{
>+ struct nlmsg_list *l;
>+ struct rtattr *tb[IFLA_MAX+1];
>+ int len;
>+ for (l = linfo->head; l; l = l->next) {
>+ struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
>+ len = l->h.nlmsg_len;
>+ len -= NLMSG_LENGTH(sizeof(*ifi));
>+ parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
>+ if (tb[IFLA_MASTER] && *(int *)RTA_DATA(tb[IFLA_MASTER]) == index)
>+ return 1;
>+ }
>+ return 0;
>+}
>+
>+static struct nlmsg_list *get_master(struct nlmsg_chain *linfo, struct rtattr **tb)
>+{
>+ struct nlmsg_list *l;
>+ if (tb[IFLA_MASTER]) {
>+ int master = *(int *)RTA_DATA(tb[IFLA_MASTER]);
>+ for (l = linfo->head; l; l = l->next) {
>+ struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
>+ if (ifi->ifi_index == master)
>+ return l;
>+ }
>+ }
>+ return NULL;
>+}
>+
>+static void print_dev_tree_item(struct nlmsg_chain *linfo, struct nlmsg_list *l, int indent) {
>+ char *name;
>+ int len;
>+ struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
>+ struct rtattr *tb[IFLA_MAX+1];
>+ len = l->h.nlmsg_len;
>+ len -= NLMSG_LENGTH(sizeof(*ifi));
>+ parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
>+ name = (char *)(tb[IFLA_IFNAME] ? rta_getattr_str(tb[IFLA_IFNAME]) : "<nil>");
>+
>+ printf("%*s%s\n", indent * 4, "", name);
>+
>+ struct nlmsg_list *master = get_master(linfo, tb);
>+ if (master) {
>+ if (indent > 8) {
>+ printf("%*s...\n", (indent + 1) * 4, "");
>+ } else {
>+ print_dev_tree_item(linfo, master, indent + 1);
>+ }
>+ }
>+}
>+
>+static void print_devtree(struct nlmsg_chain *linfo)
>+{
>+ struct nlmsg_list *l;
>+ for (l = linfo->head; l; l = l->next) {
>+ struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
>+ if (!has_master(linfo, ifi->ifi_index)) {
>+ print_dev_tree_item(linfo, l, 0);
>+ }
>+ }
>+}
>+
> static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
> {
> struct nlmsg_chain linfo = { NULL, NULL};
>@@ -1742,23 +1805,27 @@ static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
> ipaddr_filter(&linfo, &ainfo);
> }
>
>- for (l = linfo.head; l; l = l->next) {
>- int res = 0;
>- struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
>-
>- if (brief) {
>- if (print_linkinfo_brief(NULL, &l->h, stdout) == 0)
>+ if (tree) {
>+ print_devtree(&linfo);
>+ } else {
>+ for (l = linfo.head; l; l = l->next) {
>+ int res = 0;
>+ struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
>+
>+ if (brief) {
>+ if (print_linkinfo_brief(NULL, &l->h, stdout) == 0)
>+ if (filter.family != AF_PACKET)
>+ print_selected_addrinfo(ifi,
>+ ainfo.head,
>+ stdout);
>+ } else if (no_link ||
>+ (res = print_linkinfo(NULL, &l->h, stdout)) >= 0) {
> if (filter.family != AF_PACKET)
> print_selected_addrinfo(ifi,
>- ainfo.head,
>- stdout);
>- } else if (no_link ||
>- (res = print_linkinfo(NULL, &l->h, stdout)) >= 0) {
>- if (filter.family != AF_PACKET)
>- print_selected_addrinfo(ifi,
>- ainfo.head, stdout);
>- if (res > 0 && !do_link && show_stats)
>- print_link_stats(stdout, &l->h);
>+ ainfo.head, stdout);
>+ if (res > 0 && !do_link && show_stats)
>+ print_link_stats(stdout, &l->h);
>+ }
> }
> }
> fflush(stdout);
>--
>2.9.3
>
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