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Date: Sun, 26 Feb 2017 08:56:33 +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 09:22:22PM CET, zaboj.campula@...t.cz wrote:
>On Sat, 2017-02-25 at 18:39 +0100, Jiri Pirko wrote:
>> > 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...
>
>I consider this kind of output useful when troubleshooting a complex
>configuration with many interfaces. It may show relations among
>interfaces.
Did you see https://github.com/jbenc/plotnetcfg ?
>
>
>>
>>
>>
>> >
>> > > > 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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