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306 lines
7.1 KiB
306 lines
7.1 KiB
// 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 <[email protected]> |
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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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