mirror of https://gitee.com/openkylin/linux.git
net: ipv4: Convert inet_rtm_getroute to rcu versions of route lookup
Convert inet_rtm_getroute to use ip_route_input_rcu and ip_route_output_key_hash_rcu passing the fib_result arg to both. The rcu lock is held through the creation of the response, so the rtable/dst does not need to be attached to the skb and is passed to rt_fill_info directly. In converting from ip_route_output_key to ip_route_output_key_hash_rcu the xfrm_lookup_route in ip_route_output_flow is dropped since flowi4_proto is not set for a route get request. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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parent
d3166e0c95
commit
3765d35ed8
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@ -2534,11 +2534,11 @@ struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4,
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}
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EXPORT_SYMBOL_GPL(ip_route_output_flow);
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/* called with rcu_read_lock held */
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static int rt_fill_info(struct net *net, __be32 dst, __be32 src, u32 table_id,
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struct flowi4 *fl4, struct sk_buff *skb, u32 portid,
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u32 seq)
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u32 seq, struct rtable *rt)
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{
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struct rtable *rt = skb_rtable(skb);
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struct rtmsg *r;
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struct nlmsghdr *nlh;
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unsigned long expires = 0;
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@ -2653,6 +2653,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
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struct net *net = sock_net(in_skb->sk);
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struct rtmsg *rtm;
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struct nlattr *tb[RTA_MAX+1];
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struct fib_result res = {};
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struct rtable *rt = NULL;
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struct flowi4 fl4;
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__be32 dst = 0;
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@ -2709,10 +2710,12 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
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fl4.flowi4_mark = mark;
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fl4.flowi4_uid = uid;
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rcu_read_lock();
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if (iif) {
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struct net_device *dev;
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dev = __dev_get_by_index(net, iif);
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dev = dev_get_by_index_rcu(net, iif);
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if (!dev) {
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err = -ENODEV;
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goto errout_free;
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@ -2721,14 +2724,14 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
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skb->protocol = htons(ETH_P_IP);
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skb->dev = dev;
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skb->mark = mark;
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err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev);
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err = ip_route_input_rcu(skb, dst, src, rtm->rtm_tos,
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dev, &res);
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rt = skb_rtable(skb);
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if (err == 0 && rt->dst.error)
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err = -rt->dst.error;
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} else {
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rt = ip_route_output_key(net, &fl4);
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rt = ip_route_output_key_hash_rcu(net, &fl4, &res, skb);
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err = 0;
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if (IS_ERR(rt))
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err = PTR_ERR(rt);
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@ -2737,7 +2740,6 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
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if (err)
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goto errout_free;
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skb_dst_set(skb, &rt->dst);
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if (rtm->rtm_flags & RTM_F_NOTIFY)
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rt->rt_flags |= RTCF_NOTIFY;
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@ -2745,15 +2747,18 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
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table_id = rt->rt_table_id;
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err = rt_fill_info(net, dst, src, table_id, &fl4, skb,
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NETLINK_CB(in_skb).portid, nlh->nlmsg_seq);
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NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, rt);
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if (err < 0)
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goto errout_free;
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rcu_read_unlock();
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err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
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errout:
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return err;
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errout_free:
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rcu_read_unlock();
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kfree_skb(skb);
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goto errout;
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}
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