Phonet: routing table Netlink interface (f062f41d) · Commits · e / devices / android_kernel_fairphone_FP5

include/net/phonet/pn_dev.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -49,6 +49,7 @@ void phonet_address_notify(int event, struct net_device *dev, u8 addr);

	int phonet_route_add(struct net_device *dev, u8 daddr);		int phonet_route_add(struct net_device *dev, u8 daddr);
	int phonet_route_del(struct net_device *dev, u8 daddr);		int phonet_route_del(struct net_device *dev, u8 daddr);
			void rtm_phonet_notify(int event, struct net_device *dev, u8 dst);
	struct net_device phonet_route_get(struct net net, u8 daddr);		struct net_device phonet_route_get(struct net net, u8 daddr);
	struct net_device phonet_route_output(struct net net, u8 daddr);		struct net_device phonet_route_output(struct net net, u8 daddr);

net/phonet/pn_dev.c

+31 −0

Original line number	Original line	Diff line number	Diff line
	@@ -240,6 +240,27 @@ static int phonet_device_autoconf(struct net_device *dev)
	return 0;		return 0;
	}		}

			static void phonet_route_autodel(struct net_device *dev)
			{
			struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id);
			unsigned i;
			DECLARE_BITMAP(deleted, 64);

			/* Remove left-over Phonet routes */
			bitmap_zero(deleted, 64);
			spin_lock_bh(&pnn->routes.lock);
			for (i = 0; i < 64; i++)
			if (dev == pnn->routes.table[i]) {
			set_bit(i, deleted);
			pnn->routes.table[i] = NULL;
			dev_put(dev);
			}
			spin_unlock_bh(&pnn->routes.lock);
			for (i = find_first_bit(deleted, 64); i < 64;
			i = find_next_bit(deleted, 64, i + 1))
			rtm_phonet_notify(RTM_DELROUTE, dev, i);
			}

	/* notify Phonet of device events */		/* notify Phonet of device events */
	static int phonet_device_notify(struct notifier_block *me, unsigned long what,		static int phonet_device_notify(struct notifier_block *me, unsigned long what,
	void *arg)		void *arg)
	@@ -253,6 +274,7 @@ static int phonet_device_notify(struct notifier_block *me, unsigned long what,
	break;		break;
	case NETDEV_UNREGISTER:		case NETDEV_UNREGISTER:
	phonet_device_destroy(dev);		phonet_device_destroy(dev);
			phonet_route_autodel(dev);
	break;		break;
	}		}
	return 0;		return 0;
	@@ -287,10 +309,19 @@ static void phonet_exit_net(struct net *net)
	{		{
	struct phonet_net *pnn = net_generic(net, phonet_net_id);		struct phonet_net *pnn = net_generic(net, phonet_net_id);
	struct net_device *dev;		struct net_device *dev;
			unsigned i;

	rtnl_lock();		rtnl_lock();
	for_each_netdev(net, dev)		for_each_netdev(net, dev)
	phonet_device_destroy(dev);		phonet_device_destroy(dev);

			for (i = 0; i < 64; i++) {
			dev = pnn->routes.table[i];
			if (dev) {
			rtm_phonet_notify(RTM_DELROUTE, dev, i);
			dev_put(dev);
			}
			}
	rtnl_unlock();		rtnl_unlock();

	proc_net_remove(net, "phonet");		proc_net_remove(net, "phonet");

net/phonet/pn_netlink.c

+130 −0

Original line number	Original line	Diff line number	Diff line
	@@ -29,6 +29,8 @@
	#include <net/sock.h>		#include <net/sock.h>
	#include <net/phonet/pn_dev.h>		#include <net/phonet/pn_dev.h>

			/* Device address handling */

	static int fill_addr(struct sk_buff skb, struct net_device dev, u8 addr,		static int fill_addr(struct sk_buff skb, struct net_device dev, u8 addr,
	u32 pid, u32 seq, int event);		u32 pid, u32 seq, int event);

	@@ -160,6 +162,131 @@ static int getaddr_dumpit(struct sk_buff skb, struct netlink_callback cb)
	return skb->len;		return skb->len;
	}		}

			/* Routes handling */

			static int fill_route(struct sk_buff skb, struct net_device dev, u8 dst,
			u32 pid, u32 seq, int event)
			{
			struct rtmsg *rtm;
			struct nlmsghdr *nlh;

			nlh = nlmsg_put(skb, pid, seq, event, sizeof(*rtm), 0);
			if (nlh == NULL)
			return -EMSGSIZE;

			rtm = nlmsg_data(nlh);
			rtm->rtm_family = AF_PHONET;
			rtm->rtm_dst_len = 6;
			rtm->rtm_src_len = 0;
			rtm->rtm_tos = 0;
			rtm->rtm_table = RT_TABLE_MAIN;
			rtm->rtm_protocol = RTPROT_STATIC;
			rtm->rtm_scope = RT_SCOPE_UNIVERSE;
			rtm->rtm_type = RTN_UNICAST;
			rtm->rtm_flags = 0;
			NLA_PUT_U8(skb, RTA_DST, dst);
			NLA_PUT_U32(skb, RTA_OIF, dev->ifindex);
			return nlmsg_end(skb, nlh);

			nla_put_failure:
			nlmsg_cancel(skb, nlh);
			return -EMSGSIZE;
			}

			void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
			{
			struct sk_buff *skb;
			int err = -ENOBUFS;

			skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
			nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
			if (skb == NULL)
			goto errout;
			err = fill_route(skb, dev, dst, 0, 0, event);
			if (err < 0) {
			WARN_ON(err == -EMSGSIZE);
			kfree_skb(skb);
			goto errout;
			}
			rtnl_notify(skb, dev_net(dev), 0,
			RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
			return;
			errout:
			if (err < 0)
			rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
			}

			static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
			[RTA_DST] = { .type = NLA_U8 },
			[RTA_OIF] = { .type = NLA_U32 },
			};

			static int route_doit(struct sk_buff skb, struct nlmsghdr nlh, void *attr)
			{
			struct net *net = sock_net(skb->sk);
			struct nlattr *tb[RTA_MAX+1];
			struct net_device *dev;
			struct rtmsg *rtm;
			int err;
			u8 dst;

			if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

			ASSERT_RTNL();

			err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy);
			if (err < 0)
			return err;

			rtm = nlmsg_data(nlh);
			if (rtm->rtm_table != RT_TABLE_MAIN \|\| rtm->rtm_type != RTN_UNICAST)
			return -EINVAL;
			if (tb[RTA_DST] == NULL \|\| tb[RTA_OIF] == NULL)
			return -EINVAL;
			dst = nla_get_u8(tb[RTA_DST]);
			if (dst & 3) /* Phonet addresses only have 6 high-order bits */
			return -EINVAL;

			dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
			if (dev == NULL)
			return -ENODEV;

			if (nlh->nlmsg_type == RTM_NEWROUTE)
			err = phonet_route_add(dev, dst);
			else
			err = phonet_route_del(dev, dst);
			if (!err)
			rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
			return err;
			}

			static int route_dumpit(struct sk_buff skb, struct netlink_callback cb)
			{
			struct net *net = sock_net(skb->sk);
			u8 addr, addr_idx = 0, addr_start_idx = cb->args[0];

			for (addr = 0; addr < 64; addr++) {
			struct net_device *dev;

			dev = phonet_route_get(net, addr << 2);
			if (!dev)
			continue;

			if (addr_idx++ < addr_start_idx)
			continue;
			if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).pid,
			cb->nlh->nlmsg_seq, RTM_NEWROUTE))
			goto out;
			}

			out:
			cb->args[0] = addr_idx;
			cb->args[1] = 0;

			return skb->len;
			}

	int __init phonet_netlink_register(void)		int __init phonet_netlink_register(void)
	{		{
	int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL);		int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL);
	@@ -169,5 +296,8 @@ int __init phonet_netlink_register(void)
	/* Further __rtnl_register() cannot fail */		/* Further __rtnl_register() cannot fail */
	__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);		__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);
	__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);		__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);
			__rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL);
			__rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL);
			__rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit);
	return 0;		return 0;
	}		}