diff options
Diffstat (limited to 'net/core/rtnetlink.c')
| -rw-r--r-- | net/core/rtnetlink.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 5d8eb57867a9..f347d9fa78c7 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -54,6 +54,9 @@ #include <net/rtnetlink.h> #include <net/net_namespace.h> #include <net/devlink.h> +#if IS_ENABLED(CONFIG_IPV6) +#include <net/addrconf.h> +#endif #include "dev.h" @@ -6063,6 +6066,216 @@ static int rtnl_stats_set(struct sk_buff *skb, struct nlmsghdr *nlh, return 0; } +static int rtnl_mdb_valid_dump_req(const struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct br_port_msg *bpm; + + if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) { + NL_SET_ERR_MSG(extack, "Invalid header for mdb dump request"); + return -EINVAL; + } + + bpm = nlmsg_data(nlh); + if (bpm->ifindex) { + NL_SET_ERR_MSG(extack, "Filtering by device index is not supported for mdb dump request"); + return -EINVAL; + } + if (nlmsg_attrlen(nlh, sizeof(*bpm))) { + NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request"); + return -EINVAL; + } + + return 0; +} + +struct rtnl_mdb_dump_ctx { + long idx; +}; + +static int rtnl_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct rtnl_mdb_dump_ctx *ctx = (void *)cb->ctx; + struct net *net = sock_net(skb->sk); + struct net_device *dev; + int idx, s_idx; + int err; + + NL_ASSERT_DUMP_CTX_FITS(struct rtnl_mdb_dump_ctx); + + if (cb->strict_check) { + err = rtnl_mdb_valid_dump_req(cb->nlh, cb->extack); + if (err) + return err; + } + + s_idx = ctx->idx; + idx = 0; + + for_each_netdev(net, dev) { + if (idx < s_idx) + goto skip; + if (!dev->netdev_ops->ndo_mdb_dump) + goto skip; + + err = dev->netdev_ops->ndo_mdb_dump(dev, skb, cb); + if (err == -EMSGSIZE) + goto out; + /* Moving on to next device, reset markers and sequence + * counters since they are all maintained per-device. + */ + memset(cb->ctx, 0, sizeof(cb->ctx)); + cb->prev_seq = 0; + cb->seq = 0; +skip: + idx++; + } + +out: + ctx->idx = idx; + return skb->len; +} + +static int rtnl_validate_mdb_entry(const struct nlattr *attr, + struct netlink_ext_ack *extack) +{ + struct br_mdb_entry *entry = nla_data(attr); + + if (nla_len(attr) != sizeof(struct br_mdb_entry)) { + NL_SET_ERR_MSG_ATTR(extack, attr, "Invalid attribute length"); + return -EINVAL; + } + + if (entry->ifindex == 0) { + NL_SET_ERR_MSG(extack, "Zero entry ifindex is not allowed"); + return -EINVAL; + } + + if (entry->addr.proto == htons(ETH_P_IP)) { + if (!ipv4_is_multicast(entry->addr.u.ip4)) { + NL_SET_ERR_MSG(extack, "IPv4 entry group address is not multicast"); + return -EINVAL; + } + if (ipv4_is_local_multicast(entry->addr.u.ip4)) { + NL_SET_ERR_MSG(extack, "IPv4 entry group address is local multicast"); + return -EINVAL; + } +#if IS_ENABLED(CONFIG_IPV6) + } else if (entry->addr.proto == htons(ETH_P_IPV6)) { + if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) { + NL_SET_ERR_MSG(extack, "IPv6 entry group address is link-local all nodes"); + return -EINVAL; + } +#endif + } else if (entry->addr.proto == 0) { + /* L2 mdb */ + if (!is_multicast_ether_addr(entry->addr.u.mac_addr)) { + NL_SET_ERR_MSG(extack, "L2 entry group is not multicast"); + return -EINVAL; + } + } else { + NL_SET_ERR_MSG(extack, "Unknown entry protocol"); + return -EINVAL; + } + + if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) { + NL_SET_ERR_MSG(extack, "Unknown entry state"); + return -EINVAL; + } + if (entry->vid >= VLAN_VID_MASK) { + NL_SET_ERR_MSG(extack, "Invalid entry VLAN id"); + return -EINVAL; + } + + return 0; +} + +static const struct nla_policy mdba_policy[MDBA_SET_ENTRY_MAX + 1] = { + [MDBA_SET_ENTRY_UNSPEC] = { .strict_start_type = MDBA_SET_ENTRY_ATTRS + 1 }, + [MDBA_SET_ENTRY] = NLA_POLICY_VALIDATE_FN(NLA_BINARY, + rtnl_validate_mdb_entry, + sizeof(struct br_mdb_entry)), + [MDBA_SET_ENTRY_ATTRS] = { .type = NLA_NESTED }, +}; + +static int rtnl_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[MDBA_SET_ENTRY_MAX + 1]; + struct net *net = sock_net(skb->sk); + struct br_port_msg *bpm; + struct net_device *dev; + int err; + + err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb, + MDBA_SET_ENTRY_MAX, mdba_policy, extack); + if (err) + return err; + + bpm = nlmsg_data(nlh); + if (!bpm->ifindex) { + NL_SET_ERR_MSG(extack, "Invalid ifindex"); + return -EINVAL; + } + + dev = __dev_get_by_index(net, bpm->ifindex); + if (!dev) { + NL_SET_ERR_MSG(extack, "Device doesn't exist"); + return -ENODEV; + } + + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, MDBA_SET_ENTRY)) { + NL_SET_ERR_MSG(extack, "Missing MDBA_SET_ENTRY attribute"); + return -EINVAL; + } + + if (!dev->netdev_ops->ndo_mdb_add) { + NL_SET_ERR_MSG(extack, "Device does not support MDB operations"); + return -EOPNOTSUPP; + } + + return dev->netdev_ops->ndo_mdb_add(dev, tb, nlh->nlmsg_flags, extack); +} + +static int rtnl_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[MDBA_SET_ENTRY_MAX + 1]; + struct net *net = sock_net(skb->sk); + struct br_port_msg *bpm; + struct net_device *dev; + int err; + + err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb, + MDBA_SET_ENTRY_MAX, mdba_policy, extack); + if (err) + return err; + + bpm = nlmsg_data(nlh); + if (!bpm->ifindex) { + NL_SET_ERR_MSG(extack, "Invalid ifindex"); + return -EINVAL; + } + + dev = __dev_get_by_index(net, bpm->ifindex); + if (!dev) { + NL_SET_ERR_MSG(extack, "Device doesn't exist"); + return -ENODEV; + } + + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, MDBA_SET_ENTRY)) { + NL_SET_ERR_MSG(extack, "Missing MDBA_SET_ENTRY attribute"); + return -EINVAL; + } + + if (!dev->netdev_ops->ndo_mdb_del) { + NL_SET_ERR_MSG(extack, "Device does not support MDB operations"); + return -EOPNOTSUPP; + } + + return dev->netdev_ops->ndo_mdb_del(dev, tb, extack); +} + /* Process one rtnetlink message. */ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, @@ -6297,4 +6510,8 @@ void __init rtnetlink_init(void) rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump, 0); rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0); + + rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, rtnl_mdb_dump, 0); + rtnl_register(PF_BRIDGE, RTM_NEWMDB, rtnl_mdb_add, NULL, 0); + rtnl_register(PF_BRIDGE, RTM_DELMDB, rtnl_mdb_del, NULL, 0); } |