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bridge: mdb: add support for source address 

This patch adds the user-space control and dump of mdb entry source
address. When setting the new MDBA_SET_ENTRY_ATTRS nested attribute is
used and inside is added MDBE_ATTR_SOURCE based on the address family.
When dumping we look for MDBA_MDB_EATTR_SOURCE and if present we add the
"src x.x.x.x" output. The source address will be always shown as it's
needed to match the entry to modify it from user-space.

Example:
 $ bridge mdb add dev bridge port ens13 grp 239.0.0.1 src 1.2.3.4 permanent vid 100
 $ bridge mdb show
 dev bridge port ens13 grp 239.0.0.1 src 1.2.3.4 permanent vid 100

Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Nikolay Aleksandrov 2020-10-08 16:50:19 +03:00 committed by David Ahern
parent f905191a48
commit 547b319762
2 changed files with 40 additions and 6 deletions
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38
bridge/mdb.c
View File

@ -31,7 +31,7 @@ static unsigned int filter_index, filter_vlan;
static void usage(void)
{
fprintf(stderr,
"Usage: bridge mdb { add | del } dev DEV port PORT grp GROUP [permanent | temp] [vid VID]\n"
"Usage: bridge mdb { add | del } dev DEV port PORT grp GROUP [src SOURCE] [permanent | temp] [vid VID]\n"
" bridge mdb {show} [ dev DEV ] [ vid VID ]\n");
exit(-1);
}
@ -118,16 +118,16 @@ static void br_print_router_ports(FILE *f, struct rtattr *attr,
static void print_mdb_entry(FILE *f, int ifindex, const struct br_mdb_entry *e,
struct nlmsghdr *n, struct rtattr **tb)
{
const void *grp, *src;
SPRINT_BUF(abuf);
const char *dev;
const void *src;
int af;
if (filter_vlan && e->vid != filter_vlan)
return;
af = e->addr.proto == htons(ETH_P_IP) ? AF_INET : AF_INET6;
src = af == AF_INET ? (const void *)&e->addr.u.ip4 :
grp = af == AF_INET ? (const void *)&e->addr.u.ip4 :
(const void *)&e->addr.u.ip6;
dev = ll_index_to_name(ifindex);
@ -140,8 +140,13 @@ static void print_mdb_entry(FILE *f, int ifindex, const struct br_mdb_entry *e,
print_color_string(PRINT_ANY, ifa_family_color(af),
"grp", " grp %s",
inet_ntop(af, src, abuf, sizeof(abuf)));
inet_ntop(af, grp, abuf, sizeof(abuf)));
if (tb && tb[MDBA_MDB_EATTR_SOURCE]) {
src = (const void *)RTA_DATA(tb[MDBA_MDB_EATTR_SOURCE]);
print_color_string(PRINT_ANY, ifa_family_color(af),
"src", " src %s",
inet_ntop(af, src, abuf, sizeof(abuf)));
}
print_string(PRINT_ANY, "state", " %s",
(e->state & MDB_PERMANENT) ? "permanent" : "temp");
@ -378,8 +383,8 @@ static int mdb_modify(int cmd, int flags, int argc, char **argv)
.n.nlmsg_type = cmd,
.bpm.family = PF_BRIDGE,
};
char *d = NULL, *p = NULL, *grp = NULL, *src = NULL;
struct br_mdb_entry entry = {};
char *d = NULL, *p = NULL, *grp = NULL;
short vid = 0;
while (argc > 0) {
@ -400,6 +405,9 @@ static int mdb_modify(int cmd, int flags, int argc, char **argv)
} else if (strcmp(*argv, "vid") == 0) {
NEXT_ARG();
vid = atoi(*argv);
} else if (strcmp(*argv, "src") == 0) {
NEXT_ARG();
src = *argv;
} else {
if (matches(*argv, "help") == 0)
usage();
@ -431,6 +439,24 @@ static int mdb_modify(int cmd, int flags, int argc, char **argv)
entry.vid = vid;
addattr_l(&req.n, sizeof(req), MDBA_SET_ENTRY, &entry, sizeof(entry));
if (src) {
struct rtattr *nest = addattr_nest(&req.n, sizeof(req),
MDBA_SET_ENTRY_ATTRS);
struct in6_addr src_ip6;
__be32 src_ip4;
nest->rta_type |= NLA_F_NESTED;
if (!inet_pton(AF_INET, src, &src_ip4)) {
if (!inet_pton(AF_INET6, src, &src_ip6)) {
fprintf(stderr, "Invalid source address \"%s\"\n", src);
return -1;
}
addattr_l(&req.n, sizeof(req), MDBE_ATTR_SOURCE, &src_ip6, sizeof(src_ip6));
} else {
addattr32(&req.n, sizeof(req), MDBE_ATTR_SOURCE, src_ip4);
}
addattr_nest_end(&req.n, nest);
}
if (rtnl_talk(&rth, &req.n, NULL) < 0)
return -1;

8
man/man8/bridge.8
View File

@ -116,6 +116,8 @@ bridge \- show / manipulate bridge addresses and devices
.I PORT
.B grp
.IR GROUP " [ "
.B src
.IR SOURCE " ] [ "
.BR permanent " | " temp " ] [ "
.B vid
.IR VID " ] "
@ -694,6 +696,12 @@ the port.
- the mdb entry is temporary (default)
.sp
.TP
.BI src " SOURCE"
optional source IP address of a sender for this multicast group. If IGMPv3 for IPv4, or
MLDv2 for IPv6 respectively, are enabled it will be included in the lookup when
forwarding multicast traffic.
.TP
.BI vid " VID"
the VLAN ID which is known to have members of this multicast group.