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Message-Id: <20180228234400.14321-3-sharpd@cumulusnetworks.com>
Date: Wed, 28 Feb 2018 18:43:59 -0500
From: Donald Sharp <sharpd@...ulusnetworks.com>
To: netdev@...r.kernel.org, dsahern@...il.com
Subject: [PATCH v4 iproute2-next 2/3] ip: Display ip rule protocol used
Modify 'ip rule' command to notice when the kernel passes
to us the originating protocol.
Add code to allow the `ip rule flush protocol XXX`
command to be accepted and properly handled.
Modify the documentation to reflect these code changes.
Signed-off-by: Donald Sharp <sharpd@...ulusnetworks.com>
---
ip/iprule.c | 38 ++++++++++++++++++++++++++++++++++----
man/man8/ip-rule.8 | 18 +++++++++++++++++-
2 files changed, 51 insertions(+), 5 deletions(-)
diff --git a/ip/iprule.c b/ip/iprule.c
index 94356bf8..8120520e 100644
--- a/ip/iprule.c
+++ b/ip/iprule.c
@@ -47,6 +47,7 @@ static void usage(void)
" [ iif STRING ] [ oif STRING ] [ pref NUMBER ] [ l3mdev ]\n"
" [ uidrange NUMBER-NUMBER ]\n"
"ACTION := [ table TABLE_ID ]\n"
+ " [ protocol PROTO ]\n"
" [ nat ADDRESS ]\n"
" [ realms [SRCREALM/]DSTREALM ]\n"
" [ goto NUMBER ]\n"
@@ -71,6 +72,8 @@ static struct
struct fib_rule_uid_range range;
inet_prefix src;
inet_prefix dst;
+ int protocol;
+ int protocolmask;
} filter;
static inline int frh_get_table(struct fib_rule_hdr *frh, struct rtattr **tb)
@@ -338,6 +341,16 @@ int print_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
rtnl_rtntype_n2a(frh->action,
b1, sizeof(b1)));
+ if (tb[FRA_PROTOCOL]) {
+ __u8 protocol = rta_getattr_u8(tb[FRA_PROTOCOL]);
+
+ if ((protocol && protocol != RTPROT_KERNEL) ||
+ show_details > 0) {
+ fprintf(fp, " proto %s ",
+ rtnl_rtprot_n2a(protocol, b1, sizeof(b1)));
+ }
+ }
+
fprintf(fp, "\n");
fflush(fp);
return 0;
@@ -391,6 +404,13 @@ static int flush_rule(const struct sockaddr_nl *who, struct nlmsghdr *n,
parse_rtattr(tb, FRA_MAX, RTM_RTA(frh), len);
+ if (tb[FRA_PROTOCOL]) {
+ __u8 protocol = rta_getattr_u8(tb[FRA_PROTOCOL]);
+
+ if ((filter.protocol ^ protocol) & filter.protocolmask)
+ return 0;
+ }
+
if (tb[FRA_PRIORITY]) {
n->nlmsg_type = RTM_DELRULE;
n->nlmsg_flags = NLM_F_REQUEST;
@@ -415,9 +435,8 @@ static int iprule_list_flush_or_save(int argc, char **argv, int action)
if (af == AF_UNSPEC)
af = AF_INET;
- if (action != IPRULE_LIST && argc > 0) {
- fprintf(stderr, "\"ip rule %s\" does not take any arguments.\n",
- action == IPRULE_SAVE ? "save" : "flush");
+ if (action == IPRULE_SAVE && argc > 0) {
+ fprintf(stderr, "\"ip rule save\" does not take any arguments.\n");
return -1;
}
@@ -508,7 +527,18 @@ static int iprule_list_flush_or_save(int argc, char **argv, int action)
NEXT_ARG();
if (get_prefix(&filter.src, *argv, af))
invarg("from value is invalid\n", *argv);
- } else {
+ } else if (matches(*argv, "protocol") == 0) {
+ __u32 prot;
+ NEXT_ARG();
+ filter.protocolmask = -1;
+ if (rtnl_rtprot_a2n(&prot, *argv)) {
+ if (strcmp(*argv, "all") != 0)
+ invarg("invalid \"protocol\"\n", *argv);
+ prot = 0;
+ filter.protocolmask = 0;
+ }
+ filter.protocol = prot;
+ } else{
if (matches(*argv, "dst") == 0 ||
matches(*argv, "to") == 0) {
NEXT_ARG();
diff --git a/man/man8/ip-rule.8 b/man/man8/ip-rule.8
index a5c47981..7cf8fd9a 100644
--- a/man/man8/ip-rule.8
+++ b/man/man8/ip-rule.8
@@ -50,6 +50,8 @@ ip-rule \- routing policy database management
.IR ACTION " := [ "
.B table
.IR TABLE_ID " ] [ "
+.B protocol
+.IR PROTO " ] [ "
.B nat
.IR ADDRESS " ] [ "
.B realms
@@ -240,6 +242,10 @@ The options preference and order are synonyms with priority.
the routing table identifier to lookup if the rule selector matches.
It is also possible to use lookup instead of table.
+.TP
+.BI protocol " PROTO"
+the routing protocol who installed the rule in question. As an example when zebra installs a rule it would get RTPROT_ZEBRA as the installing protocol.
+
.TP
.BI suppress_prefixlength " NUMBER"
reject routing decisions that have a prefix length of NUMBER or less.
@@ -275,7 +281,11 @@ updates, it flushes the routing cache with
.RE
.TP
.B ip rule flush - also dumps all the deleted rules.
-This command has no arguments.
+.RS
+.TP
+.BI protocol " PROTO"
+Select the originating protocol.
+.RE
.TP
.B ip rule show - list rules
This command has no arguments.
@@ -283,6 +293,12 @@ The options list or lst are synonyms with show.
.TP
.B ip rule save
+.RS
+.TP
+.BI protocol " PROTO"
+Select the originating protocol.
+.RE
+.TP
save rules table information to stdout
.RS
This command behaves like
--
2.14.3
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