307 lines
7.1 KiB
C
307 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* File: pn_netlink.c
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*
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* Phonet netlink interface
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* Authors: Sakari Ailus <sakari.ailus@nokia.com>
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* Remi Denis-Courmont
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*/
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#include <linux/kernel.h>
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#include <linux/netlink.h>
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#include <linux/phonet.h>
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <net/phonet/pn_dev.h>
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/* Device address handling */
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static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
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u32 portid, u32 seq, int event);
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void phonet_address_notify(int event, struct net_device *dev, u8 addr)
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{
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struct sk_buff *skb;
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int err = -ENOBUFS;
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skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
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nla_total_size(1), GFP_KERNEL);
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if (skb == NULL)
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goto errout;
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err = fill_addr(skb, dev, addr, 0, 0, event);
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if (err < 0) {
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(skb);
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goto errout;
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}
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rtnl_notify(skb, dev_net(dev), 0,
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RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
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return;
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errout:
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rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
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}
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static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
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[IFA_LOCAL] = { .type = NLA_U8 },
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};
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static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct netlink_ext_ack *extack)
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{
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struct net *net = sock_net(skb->sk);
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struct nlattr *tb[IFA_MAX+1];
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struct net_device *dev;
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struct ifaddrmsg *ifm;
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int err;
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u8 pnaddr;
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if (!netlink_capable(skb, CAP_NET_ADMIN))
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return -EPERM;
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if (!netlink_capable(skb, CAP_SYS_ADMIN))
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return -EPERM;
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ASSERT_RTNL();
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err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
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ifa_phonet_policy, extack);
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if (err < 0)
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return err;
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ifm = nlmsg_data(nlh);
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if (tb[IFA_LOCAL] == NULL)
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return -EINVAL;
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pnaddr = nla_get_u8(tb[IFA_LOCAL]);
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if (pnaddr & 3)
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/* Phonet addresses only have 6 high-order bits */
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return -EINVAL;
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dev = __dev_get_by_index(net, ifm->ifa_index);
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if (dev == NULL)
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return -ENODEV;
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if (nlh->nlmsg_type == RTM_NEWADDR)
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err = phonet_address_add(dev, pnaddr);
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else
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err = phonet_address_del(dev, pnaddr);
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if (!err)
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phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
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return err;
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}
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static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
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u32 portid, u32 seq, int event)
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{
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struct ifaddrmsg *ifm;
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struct nlmsghdr *nlh;
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nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0);
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if (nlh == NULL)
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return -EMSGSIZE;
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ifm = nlmsg_data(nlh);
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ifm->ifa_family = AF_PHONET;
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ifm->ifa_prefixlen = 0;
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ifm->ifa_flags = IFA_F_PERMANENT;
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ifm->ifa_scope = RT_SCOPE_LINK;
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ifm->ifa_index = dev->ifindex;
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if (nla_put_u8(skb, IFA_LOCAL, addr))
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goto nla_put_failure;
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nlmsg_end(skb, nlh);
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return 0;
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct phonet_device_list *pndevs;
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struct phonet_device *pnd;
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int dev_idx = 0, dev_start_idx = cb->args[0];
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int addr_idx = 0, addr_start_idx = cb->args[1];
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pndevs = phonet_device_list(sock_net(skb->sk));
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rcu_read_lock();
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list_for_each_entry_rcu(pnd, &pndevs->list, list) {
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u8 addr;
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if (dev_idx > dev_start_idx)
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addr_start_idx = 0;
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if (dev_idx++ < dev_start_idx)
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continue;
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addr_idx = 0;
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for_each_set_bit(addr, pnd->addrs, 64) {
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if (addr_idx++ < addr_start_idx)
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continue;
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if (fill_addr(skb, pnd->netdev, addr << 2,
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
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goto out;
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}
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}
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out:
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rcu_read_unlock();
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cb->args[0] = dev_idx;
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cb->args[1] = addr_idx;
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return skb->len;
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}
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/* Routes handling */
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static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
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u32 portid, u32 seq, int event)
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{
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struct rtmsg *rtm;
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struct nlmsghdr *nlh;
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nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0);
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if (nlh == NULL)
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return -EMSGSIZE;
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rtm = nlmsg_data(nlh);
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rtm->rtm_family = AF_PHONET;
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rtm->rtm_dst_len = 6;
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rtm->rtm_src_len = 0;
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rtm->rtm_tos = 0;
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rtm->rtm_table = RT_TABLE_MAIN;
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rtm->rtm_protocol = RTPROT_STATIC;
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rtm->rtm_scope = RT_SCOPE_UNIVERSE;
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rtm->rtm_type = RTN_UNICAST;
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rtm->rtm_flags = 0;
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if (nla_put_u8(skb, RTA_DST, dst) ||
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nla_put_u32(skb, RTA_OIF, dev->ifindex))
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goto nla_put_failure;
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nlmsg_end(skb, nlh);
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return 0;
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
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{
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struct sk_buff *skb;
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int err = -ENOBUFS;
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skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
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nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
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if (skb == NULL)
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goto errout;
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err = fill_route(skb, dev, dst, 0, 0, event);
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if (err < 0) {
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(skb);
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goto errout;
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}
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rtnl_notify(skb, dev_net(dev), 0,
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RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
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return;
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errout:
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rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
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}
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static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
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[RTA_DST] = { .type = NLA_U8 },
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[RTA_OIF] = { .type = NLA_U32 },
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};
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static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct netlink_ext_ack *extack)
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{
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struct net *net = sock_net(skb->sk);
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struct nlattr *tb[RTA_MAX+1];
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struct net_device *dev;
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struct rtmsg *rtm;
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int err;
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u8 dst;
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if (!netlink_capable(skb, CAP_NET_ADMIN))
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return -EPERM;
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if (!netlink_capable(skb, CAP_SYS_ADMIN))
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return -EPERM;
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ASSERT_RTNL();
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err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
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rtm_phonet_policy, extack);
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if (err < 0)
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return err;
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rtm = nlmsg_data(nlh);
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if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
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return -EINVAL;
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if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
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return -EINVAL;
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dst = nla_get_u8(tb[RTA_DST]);
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if (dst & 3) /* Phonet addresses only have 6 high-order bits */
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return -EINVAL;
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dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
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if (dev == NULL)
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return -ENODEV;
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if (nlh->nlmsg_type == RTM_NEWROUTE)
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err = phonet_route_add(dev, dst);
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else
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err = phonet_route_del(dev, dst);
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if (!err)
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rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
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return err;
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}
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static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct net *net = sock_net(skb->sk);
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u8 addr;
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rcu_read_lock();
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for (addr = cb->args[0]; addr < 64; addr++) {
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struct net_device *dev = phonet_route_get_rcu(net, addr << 2);
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if (!dev)
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continue;
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if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, RTM_NEWROUTE) < 0)
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goto out;
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}
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out:
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rcu_read_unlock();
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cb->args[0] = addr;
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return skb->len;
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}
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int __init phonet_netlink_register(void)
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{
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int err = rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_NEWADDR,
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addr_doit, NULL, 0);
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if (err)
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return err;
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/* Further rtnl_register_module() cannot fail */
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rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_DELADDR,
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addr_doit, NULL, 0);
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rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_GETADDR,
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NULL, getaddr_dumpit, 0);
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rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_NEWROUTE,
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route_doit, NULL, 0);
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rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_DELROUTE,
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route_doit, NULL, 0);
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rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_GETROUTE,
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NULL, route_dumpit, 0);
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return 0;
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}
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