[PATCH net-next 03/15] net: bridge: mcast: add support for src list and filter mode dumping
From: Nikolay Aleksandrov <hidden>
Date: 2020-08-31 15:10:57
Also in:
bridge
Subsystem:
ethernet bridge, networking drivers, networking [general], the rest · Maintainers:
Nikolay Aleksandrov, Ido Schimmel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Support per port group src list (address and timer) and filter mode dumping. Currently limited only to IPv4. Signed-off-by: Nikolay Aleksandrov <redacted> --- include/uapi/linux/if_bridge.h | 21 +++++++++++ net/bridge/br_mdb.c | 66 ++++++++++++++++++++++++++++++++-- 2 files changed, 85 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index c1227aecd38f..75a2ac479247 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h@@ -455,10 +455,31 @@ enum { enum { MDBA_MDB_EATTR_UNSPEC, MDBA_MDB_EATTR_TIMER, + MDBA_MDB_EATTR_SRC_LIST, + MDBA_MDB_EATTR_GROUP_MODE, __MDBA_MDB_EATTR_MAX }; #define MDBA_MDB_EATTR_MAX (__MDBA_MDB_EATTR_MAX - 1) +/* per mdb entry source */ +enum { + MDBA_MDB_SRCLIST_UNSPEC, + MDBA_MDB_SRCLIST_ENTRY, + __MDBA_MDB_SRCLIST_MAX +}; +#define MDBA_MDB_SRCLIST_MAX (__MDBA_MDB_SRCLIST_MAX - 1) + +/* per mdb entry per source attributes + * these are embedded in MDBA_MDB_SRCLIST_ENTRY + */ +enum { + MDBA_MDB_SRCATTR_UNSPEC, + MDBA_MDB_SRCATTR_ADDRESS, + MDBA_MDB_SRCATTR_TIMER, + __MDBA_MDB_SRCATTR_MAX +}; +#define MDBA_MDB_SRCATTR_MAX (__MDBA_MDB_SRCATTR_MAX - 1) + /* multicast router types */ enum { MDB_RTR_TYPE_DISABLED,
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 025a5aff2b2f..7e6a1f6aff8a 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c@@ -77,6 +77,52 @@ static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip) #endif } +static int __mdb_fill_srcs(struct sk_buff *skb, + struct net_bridge_port_group *p) +{ + struct net_bridge_group_src *ent; + struct nlattr *nest, *nest_ent; + + if (hlist_empty(&p->src_list)) + return 0; + + nest = nla_nest_start(skb, MDBA_MDB_EATTR_SRC_LIST); + if (!nest) + return -EMSGSIZE; + + hlist_for_each_entry(ent, &p->src_list, node) { + nest_ent = nla_nest_start(skb, MDBA_MDB_SRCLIST_ENTRY); + if (!nest_ent) + goto out_cancel_err; + switch (ent->addr.proto) { + case htons(ETH_P_IP): + if (nla_put_in_addr(skb, MDBA_MDB_SRCATTR_ADDRESS, + ent->addr.u.ip4)) { + nla_nest_cancel(skb, nest_ent); + goto out_cancel_err; + } + break; + default: + nla_nest_cancel(skb, nest_ent); + continue; + } + if (nla_put_u32(skb, MDBA_MDB_SRCATTR_TIMER, + br_timer_value(&ent->timer))) { + nla_nest_cancel(skb, nest_ent); + goto out_cancel_err; + } + nla_nest_end(skb, nest_ent); + } + + nla_nest_end(skb, nest); + + return 0; + +out_cancel_err: + nla_nest_cancel(skb, nest); + return -EMSGSIZE; +} + static int __mdb_fill_info(struct sk_buff *skb, struct net_bridge_mdb_entry *mp, struct net_bridge_port_group *p)
@@ -119,6 +165,15 @@ static int __mdb_fill_info(struct sk_buff *skb, nla_nest_cancel(skb, nest_ent); return -EMSGSIZE; } + if (p && + mp->br->multicast_igmp_version == 3 && + mp->addr.proto == htons(ETH_P_IP) && + (__mdb_fill_srcs(skb, p) || + nla_put_u8(skb, MDBA_MDB_EATTR_GROUP_MODE, p->filter_mode))) { + nla_nest_cancel(skb, nest_ent); + return -EMSGSIZE; + } + nla_nest_end(skb, nest_ent); return 0;
@@ -127,7 +182,7 @@ static int __mdb_fill_info(struct sk_buff *skb, static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, struct net_device *dev) { - int idx = 0, s_idx = cb->args[1], err = 0; + int idx = 0, s_idx = cb->args[1], err = 0, pidx = 0, s_pidx = cb->args[2]; struct net_bridge *br = netdev_priv(dev); struct net_bridge_mdb_entry *mp; struct nlattr *nest, *nest2;
@@ -152,7 +207,7 @@ static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, break; } - if (mp->host_joined) { + if (!s_pidx && mp->host_joined) { err = __mdb_fill_info(skb, mp, NULL); if (err) { nla_nest_cancel(skb, nest2);
@@ -164,13 +219,19 @@ static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, pp = &p->next) { if (!p->port) continue; + if (pidx < s_pidx) + goto skip_pg; err = __mdb_fill_info(skb, mp, p); if (err) { nla_nest_cancel(skb, nest2); goto out; } +skip_pg: + pidx++; } + pidx = 0; + s_pidx = 0; nla_nest_end(skb, nest2); skip: idx++;
@@ -178,6 +239,7 @@ static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, out: cb->args[1] = idx; + cb->args[2] = pidx; nla_nest_end(skb, nest); return err; }
--
2.25.4