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Date: Mon, 23 Jul 2007 13:26:00 +0530
From: Krishna Kumar2 <krkumar2@...ibm.com>
To: Varun Chandramohan <varunc@...ux.vnet.ibm.com>
Cc: dlstevens@...ibm.com, netdev@...r.kernel.org, sri@...ibm.com,
Varun Chandramohan <varuncha@...ibm.com>
Subject: Re: [PATCH 4/4] Initialize and fill IPv6 route age
> + if (dumpflg)
> + NLA_PUT_U32(skb, RTA_AGE, timeval_to_sec(&tv) - rt->rt6i_age);
> + else
> + NLA_PUT_U32(skb, RTA_AGE, rt->rt6i_age);
Makes more sense (and easy to understand) if you use :
if (dumpflg == RT6_GET_ROUTE_INFO)
...
so that your code does not break if someone changed the #define values.
- KK
netdev-owner@...r.kernel.org wrote on 07/23/2007 10:13:18 AM:
> The age field of the ipv6 route structures are initilized with the
current
> timeval at the time of route creation. When the route dump is
called the
> route age value stored in the structure is subtracted from the
present
> timeval and the difference is passed on as the route age.
>
> Signed-off-by: Varun Chandramohan <varunc@...ux.vnet.ibm.com>
> ---
> include/net/ip6_fib.h | 1 +
> include/net/ip6_route.h | 3 +++
> net/ipv6/addrconf.c | 5 +++++
> net/ipv6/route.c | 23 +++++++++++++++++++----
> 4 files changed, 28 insertions(+), 4 deletions(-)
>
> diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
> index c48ea87..e30a1cf 100644
> --- a/include/net/ip6_fib.h
> +++ b/include/net/ip6_fib.h
> @@ -98,6 +98,7 @@ struct rt6_info
>
> u32 rt6i_flags;
> u32 rt6i_metric;
> + time_t rt6i_age;
> atomic_t rt6i_ref;
> struct fib6_table *rt6i_table;
>
> diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
> index 5456fdd..fc9716c 100644
> --- a/include/net/ip6_route.h
> +++ b/include/net/ip6_route.h
> @@ -36,6 +36,9 @@ struct route_info {
> #define RT6_LOOKUP_F_REACHABLE 0x2
> #define RT6_LOOKUP_F_HAS_SADDR 0x4
>
> +#define RT6_SET_ROUTE_INFO 0x0
> +#define RT6_GET_ROUTE_INFO 0x1
> +
> extern struct rt6_info ip6_null_entry;
>
> #ifdef CONFIG_IPV6_MULTIPLE_TABLES
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 5a5f8bd..715c766 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -4187,6 +4187,7 @@ EXPORT_SYMBOL(unregister_inet6addr_notif
>
> int __init addrconf_init(void)
> {
> + struct timeval tv;
> int err = 0;
>
> /* The addrconf netdev notifier requires that loopback_dev
> @@ -4214,10 +4215,14 @@ int __init addrconf_init(void)
> if (err)
> return err;
>
> + do_gettimeofday(&tv);
> ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
> + ip6_null_entry.rt6i_age = timeval_to_sec(&tv);
> #ifdef CONFIG_IPV6_MULTIPLE_TABLES
> ip6_prohibit_entry.rt6i_idev = in6_dev_get(&loopback_dev);
> + ip6_prohibit_entry.rt6i_age = timeval_to_sec(&tv);
> ip6_blk_hole_entry.rt6i_idev = in6_dev_get(&loopback_dev);
> + ip6_blk_hole_entry.rt6i_age = timeval_to_sec(&tv);
> #endif
>
> register_netdevice_notifier(&ipv6_dev_notf);
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index fe8d983..9386c05 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -600,7 +600,14 @@ static int __ip6_ins_rt(struct rt6_info
> {
> int err;
> struct fib6_table *table;
> + struct timeval tv;
>
> + do_gettimeofday(&tv);
> + /* Update the timeval for new routes
> + * We add it here to make it common irrespective
> + * of how the new route is added.
> + */
> + rt->rt6i_age = timeval_to_sec(&tv);
> table = rt->rt6i_table;
> write_lock_bh(&table->tb6_lock);
> err = fib6_add(&table->tb6_root, rt, info);
> @@ -2111,6 +2118,7 @@ static inline size_t rt6_nlmsg_size(void
> + nla_total_size(4) /* RTA_IIF */
> + nla_total_size(4) /* RTA_OIF */
> + nla_total_size(4) /* RTA_PRIORITY */
> + + nla_total_size(4) /*RTA_AGE*/
> + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
> + nla_total_size(sizeof(struct rta_cacheinfo));
> }
> @@ -2118,10 +2126,11 @@ static inline size_t rt6_nlmsg_size(void
> static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
> struct in6_addr *dst, struct in6_addr *src,
> int iif, int type, u32 pid, u32 seq,
> - int prefix, unsigned int flags)
> + int prefix, unsigned int flags, int dumpflg)
> {
> struct rtmsg *rtm;
> struct nlmsghdr *nlh;
> + struct timeval tv;
> long expires;
> u32 table;
>
> @@ -2185,6 +2194,12 @@ static int rt6_fill_node(struct sk_buff
> if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
> NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
> }
> +
> + do_gettimeofday(&tv);
> + if (dumpflg)
> + NLA_PUT_U32(skb, RTA_AGE, timeval_to_sec(&tv) - rt->rt6i_age);
> + else
> + NLA_PUT_U32(skb, RTA_AGE, rt->rt6i_age);
>
> if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
> goto nla_put_failure;
> @@ -2222,7 +2237,7 @@ int rt6_dump_route(struct rt6_info *rt,
>
> return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
> NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
> - prefix, NLM_F_MULTI);
> + prefix, NLM_F_MULTI, RT6_GET_ROUTE_INFO);
> }
>
> static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr*
nlh, void *arg)
> @@ -2287,7 +2302,7 @@ static int inet6_rtm_getroute(struct sk_
>
> err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
> RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
> - nlh->nlmsg_seq, 0, 0);
> + nlh->nlmsg_seq, 0, 0, RT6_GET_ROUTE_INFO);
> if (err < 0) {
> kfree_skb(skb);
> goto errout;
> @@ -2316,7 +2331,7 @@ void inet6_rt_notify(int event, struct r
> if (skb == NULL)
> goto errout;
>
> - err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0);
> + err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0,
> RT6_SET_ROUTE_INFO);
> if (err < 0) {
> /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
> WARN_ON(err == -EMSGSIZE);
> --
> 1.4.3.4
>
> -
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