Extend the 'bridge mdb' command for the following syntax: bridge mdb add dev br0 port swp0 grp 01:02:03:04:05:06 permanent Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx> --- Changes in v3: - Using rt_addr_n2a_r instead of inet_ntop/ll_addr_n2a directly. - Updated the bridge manpage. Changes in v2: - Removed the const void casts. - Removed MDB_FLAGS_L2 from the UAPI to be in sync with the latest kernel patch: https://patchwork.ozlabs.org/project/netdev/patch/20201028233831.610076-1-vladimir.oltean@xxxxxxx/ bridge/mdb.c | 54 ++++++++++++++++++++++++++-------- include/uapi/linux/if_bridge.h | 1 + man/man8/bridge.8 | 8 ++--- 3 files changed, 46 insertions(+), 17 deletions(-) diff --git a/bridge/mdb.c b/bridge/mdb.c index 4cd7ca762b78..ef89258bc5c3 100644 --- a/bridge/mdb.c +++ b/bridge/mdb.c @@ -149,6 +149,7 @@ 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; + const char *addr; SPRINT_BUF(abuf); const char *dev; int af; @@ -156,9 +157,16 @@ static void print_mdb_entry(FILE *f, int ifindex, const struct br_mdb_entry *e, if (filter_vlan && e->vid != filter_vlan) return; - af = e->addr.proto == htons(ETH_P_IP) ? AF_INET : AF_INET6; - grp = af == AF_INET ? (const void *)&e->addr.u.ip4 : - (const void *)&e->addr.u.ip6; + if (!e->addr.proto) { + af = AF_PACKET; + grp = &e->addr.u.mac_addr; + } else if (e->addr.proto == htons(ETH_P_IP)) { + af = AF_INET; + grp = &e->addr.u.ip4; + } else { + af = AF_INET6; + grp = &e->addr.u.ip6; + } dev = ll_index_to_name(ifindex); open_json_object(NULL); @@ -168,9 +176,14 @@ static void print_mdb_entry(FILE *f, int ifindex, const struct br_mdb_entry *e, print_string(PRINT_ANY, "port", " port %s", ll_index_to_name(e->ifindex)); + /* The ETH_ALEN argument is ignored for all cases but AF_PACKET */ + addr = rt_addr_n2a_r(af, ETH_ALEN, grp, abuf, sizeof(abuf)); + if (!addr) + return; + print_color_string(PRINT_ANY, ifa_family_color(af), - "grp", " grp %s", - inet_ntop(af, grp, abuf, sizeof(abuf))); + "grp", " grp %s", addr); + 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), @@ -440,6 +453,25 @@ static int mdb_show(int argc, char **argv) return 0; } +static int mdb_parse_grp(const char *grp, struct br_mdb_entry *e) +{ + if (inet_pton(AF_INET, grp, &e->addr.u.ip4)) { + e->addr.proto = htons(ETH_P_IP); + return 0; + } + if (inet_pton(AF_INET6, grp, &e->addr.u.ip6)) { + e->addr.proto = htons(ETH_P_IPV6); + return 0; + } + if (ll_addr_a2n((char *)e->addr.u.mac_addr, sizeof(e->addr.u.mac_addr), + grp) == ETH_ALEN) { + e->addr.proto = 0; + return 0; + } + + return -1; +} + static int mdb_modify(int cmd, int flags, int argc, char **argv) { struct { @@ -497,14 +529,10 @@ static int mdb_modify(int cmd, int flags, int argc, char **argv) if (!entry.ifindex) return nodev(p); - if (!inet_pton(AF_INET, grp, &entry.addr.u.ip4)) { - if (!inet_pton(AF_INET6, grp, &entry.addr.u.ip6)) { - fprintf(stderr, "Invalid address \"%s\"\n", grp); - return -1; - } else - entry.addr.proto = htons(ETH_P_IPV6); - } else - entry.addr.proto = htons(ETH_P_IP); + if (mdb_parse_grp(grp, &entry)) { + fprintf(stderr, "Invalid address \"%s\"\n", grp); + return -1; + } entry.vid = vid; addattr_l(&req.n, sizeof(req), MDBA_SET_ENTRY, &entry, sizeof(entry)); diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h index 69b99901fc5a..db41a5ff34af 100644 --- a/include/uapi/linux/if_bridge.h +++ b/include/uapi/linux/if_bridge.h @@ -526,6 +526,7 @@ struct br_mdb_entry { union { __be32 ip4; struct in6_addr ip6; + unsigned char mac_addr[ETH_ALEN]; } u; __be16 proto; } addr; diff --git a/man/man8/bridge.8 b/man/man8/bridge.8 index 84b9b70c7dea..b3414ae31faf 100644 --- a/man/man8/bridge.8 +++ b/man/man8/bridge.8 @@ -665,7 +665,7 @@ the bridge to which this address is associated. .SH bridge mdb - multicast group database management .B mdb -objects contain known IP multicast group addresses on a link. +objects contain known IP or L2 multicast group addresses on a link. .P The corresponding commands display mdb entries, add new entries, @@ -685,11 +685,11 @@ the port whose link is known to have members of this multicast group. .TP .BI grp " GROUP" -the IP multicast group address whose members reside on the link connected to -the port. +the multicast group address (IPv4, IPv6 or L2 multicast) whose members reside +on the link connected to the port. .B permanent -- the mdb entry is permanent +- the mdb entry is permanent. Optional for IPv4 and IPv6, mandatory for L2. .sp .B temp -- 2.25.1
