diff options
Diffstat (limited to 'net/core/rtnetlink.c')
| -rw-r--r-- | net/core/rtnetlink.c | 230 |
1 files changed, 224 insertions, 6 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index fad649ae4dec..1868625af25e 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -128,7 +128,7 @@ static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) if (tab == NULL || tab[msgindex].doit == NULL) tab = rtnl_msg_handlers[PF_UNSPEC]; - return tab ? tab[msgindex].doit : NULL; + return tab[msgindex].doit; } static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) @@ -143,7 +143,7 @@ static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) if (tab == NULL || tab[msgindex].dumpit == NULL) tab = rtnl_msg_handlers[PF_UNSPEC]; - return tab ? tab[msgindex].dumpit : NULL; + return tab[msgindex].dumpit; } static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) @@ -158,7 +158,7 @@ static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex) if (tab == NULL || tab[msgindex].calcit == NULL) tab = rtnl_msg_handlers[PF_UNSPEC]; - return tab ? tab[msgindex].calcit : NULL; + return tab[msgindex].calcit; } /** @@ -1316,6 +1316,10 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, err = PTR_ERR(net); goto errout; } + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) { + err = -EPERM; + goto errout; + } err = dev_change_net_namespace(dev, net, ifname); put_net(net); if (err) @@ -1638,7 +1642,7 @@ int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm) } EXPORT_SYMBOL(rtnl_configure_link); -struct net_device *rtnl_create_link(struct net *src_net, struct net *net, +struct net_device *rtnl_create_link(struct net *net, char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) { int err; @@ -1836,7 +1840,7 @@ replay: if (IS_ERR(dest_net)) return PTR_ERR(dest_net); - dev = rtnl_create_link(net, dest_net, ifname, ops, tb); + dev = rtnl_create_link(dest_net, ifname, ops, tb); if (IS_ERR(dev)) { err = PTR_ERR(dev); goto out; @@ -2057,6 +2061,9 @@ static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) u8 *addr; int err; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); if (err < 0) return err; @@ -2123,6 +2130,9 @@ static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) int err = -EINVAL; __u8 *addr; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + if (nlmsg_len(nlh) < sizeof(*ndm)) return -EINVAL; @@ -2253,6 +2263,211 @@ static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) return skb->len; } +int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, + struct net_device *dev, u16 mode) +{ + struct nlmsghdr *nlh; + struct ifinfomsg *ifm; + struct nlattr *br_afspec; + u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; + + nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI); + if (nlh == NULL) + return -EMSGSIZE; + + ifm = nlmsg_data(nlh); + ifm->ifi_family = AF_BRIDGE; + ifm->__ifi_pad = 0; + ifm->ifi_type = dev->type; + ifm->ifi_index = dev->ifindex; + ifm->ifi_flags = dev_get_flags(dev); + ifm->ifi_change = 0; + + + if (nla_put_string(skb, IFLA_IFNAME, dev->name) || + nla_put_u32(skb, IFLA_MTU, dev->mtu) || + nla_put_u8(skb, IFLA_OPERSTATE, operstate) || + (dev->master && + nla_put_u32(skb, IFLA_MASTER, dev->master->ifindex)) || + (dev->addr_len && + nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || + (dev->ifindex != dev->iflink && + nla_put_u32(skb, IFLA_LINK, dev->iflink))) + goto nla_put_failure; + + br_afspec = nla_nest_start(skb, IFLA_AF_SPEC); + if (!br_afspec) + goto nla_put_failure; + + if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) || + nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) { + nla_nest_cancel(skb, br_afspec); + goto nla_put_failure; + } + nla_nest_end(skb, br_afspec); + + return nlmsg_end(skb, nlh); +nla_put_failure: + nlmsg_cancel(skb, nlh); + return -EMSGSIZE; +} +EXPORT_SYMBOL(ndo_dflt_bridge_getlink); + +static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct net *net = sock_net(skb->sk); + struct net_device *dev; + int idx = 0; + u32 portid = NETLINK_CB(cb->skb).portid; + u32 seq = cb->nlh->nlmsg_seq; + + rcu_read_lock(); + for_each_netdev_rcu(net, dev) { + const struct net_device_ops *ops = dev->netdev_ops; + struct net_device *master = dev->master; + + if (master && master->netdev_ops->ndo_bridge_getlink) { + if (idx >= cb->args[0] && + master->netdev_ops->ndo_bridge_getlink( + skb, portid, seq, dev) < 0) + break; + idx++; + } + + if (ops->ndo_bridge_getlink) { + if (idx >= cb->args[0] && + ops->ndo_bridge_getlink(skb, portid, seq, dev) < 0) + break; + idx++; + } + } + rcu_read_unlock(); + cb->args[0] = idx; + + return skb->len; +} + +static inline size_t bridge_nlmsg_size(void) +{ + return NLMSG_ALIGN(sizeof(struct ifinfomsg)) + + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ + + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ + + nla_total_size(sizeof(u32)) /* IFLA_MASTER */ + + nla_total_size(sizeof(u32)) /* IFLA_MTU */ + + nla_total_size(sizeof(u32)) /* IFLA_LINK */ + + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */ + + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */ + + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */ + + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */ + + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */ +} + +static int rtnl_bridge_notify(struct net_device *dev, u16 flags) +{ + struct net *net = dev_net(dev); + struct net_device *master = dev->master; + struct sk_buff *skb; + int err = -EOPNOTSUPP; + + skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC); + if (!skb) { + err = -ENOMEM; + goto errout; + } + + if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) && + master && master->netdev_ops->ndo_bridge_getlink) { + err = master->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev); + if (err < 0) + goto errout; + } + + if ((flags & BRIDGE_FLAGS_SELF) && + dev->netdev_ops->ndo_bridge_getlink) { + err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev); + if (err < 0) + goto errout; + } + + rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); + return 0; +errout: + WARN_ON(err == -EMSGSIZE); + kfree_skb(skb); + rtnl_set_sk_err(net, RTNLGRP_LINK, err); + return err; +} + +static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, + void *arg) +{ + struct net *net = sock_net(skb->sk); + struct ifinfomsg *ifm; + struct net_device *dev; + struct nlattr *br_spec, *attr = NULL; + int rem, err = -EOPNOTSUPP; + u16 oflags, flags = 0; + bool have_flags = false; + + if (nlmsg_len(nlh) < sizeof(*ifm)) + return -EINVAL; + + ifm = nlmsg_data(nlh); + if (ifm->ifi_family != AF_BRIDGE) + return -EPFNOSUPPORT; + + dev = __dev_get_by_index(net, ifm->ifi_index); + if (!dev) { + pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n"); + return -ENODEV; + } + + br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); + if (br_spec) { + nla_for_each_nested(attr, br_spec, rem) { + if (nla_type(attr) == IFLA_BRIDGE_FLAGS) { + have_flags = true; + flags = nla_get_u16(attr); + break; + } + } + } + + oflags = flags; + + if (!flags || (flags & BRIDGE_FLAGS_MASTER)) { + if (!dev->master || + !dev->master->netdev_ops->ndo_bridge_setlink) { + err = -EOPNOTSUPP; + goto out; + } + + err = dev->master->netdev_ops->ndo_bridge_setlink(dev, nlh); + if (err) + goto out; + + flags &= ~BRIDGE_FLAGS_MASTER; + } + + if ((flags & BRIDGE_FLAGS_SELF)) { + if (!dev->netdev_ops->ndo_bridge_setlink) + err = -EOPNOTSUPP; + else + err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh); + + if (!err) + flags &= ~BRIDGE_FLAGS_SELF; + } + + if (have_flags) + memcpy(nla_data(attr), &flags, sizeof(flags)); + /* Generate event to notify upper layer of bridge change */ + if (!err) + err = rtnl_bridge_notify(dev, oflags); +out: + return err; +} + /* Protected by RTNL sempahore. */ static struct rtattr **rta_buf; static int rtattr_max; @@ -2283,7 +2498,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) sz_idx = type>>2; kind = type&3; - if (kind != 2 && !capable(CAP_NET_ADMIN)) + if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN)) return -EPERM; if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { @@ -2434,5 +2649,8 @@ void __init rtnetlink_init(void) rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL); rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL); rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL); + + rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL); + rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL); } |