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Date: Thu, 14 Apr 2011 16:49:54 +0200
From: Daniel Walter <sahne@...0.at>
To: Stephen Clark <sclark46@...thlink.net>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
davem@...emloft.net
Subject: Re: [PATCH 1/1] ipv6: RTA_PREFSRC support for ipv6 route source
address selection
On Thu, Apr 14, 2011 at 10:01:09AM -0400, Stephen Clark wrote:
> On 04/14/2011 03:10 AM, Daniel Walter wrote:
> > [ipv6] Add support for RTA_PREFSRC
> >
> > This patch allows a user to select the preferred source address
> > for a specific IPv6-Route. It can be set via a netlink message
> > setting RTA_PREFSRC to a valid IPv6 address which must be
> > up on the device the route will be bound to.
> >
> >
> > Signed-off-by: Daniel Walter<dwalter@...racuda.com>
> > ---
> > Repost patch, after fixing some warnings pointed out on netdev@
> > applies clean against current linux-2.6 HEAD
> >
> > include/net/ip6_fib.h | 2 +
> > include/net/ip6_route.h | 7 ++++
> > net/ipv6/addrconf.c | 2 +
> > net/ipv6/ip6_output.c | 8 ++--
> > net/ipv6/route.c | 72 +++++++++++++++++++++++++++++++++++++++++++++--
> > 5 files changed, 84 insertions(+), 7 deletions(-)
> >
> > ---
> > diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
> > index bc3cde0..98348d5 100644
> > --- a/include/net/ip6_fib.h
> > +++ b/include/net/ip6_fib.h
> > @@ -42,6 +42,7 @@ struct fib6_config {
> >
> > struct in6_addr fc_dst;
> > struct in6_addr fc_src;
> > + struct in6_addr fc_prefsrc;
> > struct in6_addr fc_gateway;
> >
> > unsigned long fc_expires;
> > @@ -107,6 +108,7 @@ struct rt6_info {
> > struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
> > u32 rt6i_flags;
> > struct rt6key rt6i_src;
> > + struct rt6key rt6i_prefsrc;
> > u32 rt6i_metric;
> > u32 rt6i_peer_genid;
> >
> > diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
> > index c850e5f..86b1cb4 100644
> > --- a/include/net/ip6_route.h
> > +++ b/include/net/ip6_route.h
> > @@ -84,6 +84,12 @@ extern int ip6_route_add(struct fib6_config *cfg);
> > extern int ip6_ins_rt(struct rt6_info *);
> > extern int ip6_del_rt(struct rt6_info *);
> >
> > +extern int ip6_route_get_saddr(struct net *net,
> > + struct rt6_info *rt,
> > + struct in6_addr *daddr,
> > + unsigned int prefs,
> > + struct in6_addr *saddr);
> > +
> > extern struct rt6_info *rt6_lookup(struct net *net,
> > const struct in6_addr *daddr,
> > const struct in6_addr *saddr,
> > @@ -141,6 +147,7 @@ struct rt6_rtnl_dump_arg {
> > extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
> > extern void rt6_ifdown(struct net *net, struct net_device *dev);
> > extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
> > +extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
> >
> >
> > /*
> > diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> > index 1493534..129d7e1 100644
> > --- a/net/ipv6/addrconf.c
> > +++ b/net/ipv6/addrconf.c
> > @@ -825,6 +825,8 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
> > dst_release(&rt->dst);
> > }
> >
> > + /* clean up prefsrc entries */
> > + rt6_remove_prefsrc(ifp);
> > out:
> > in6_ifa_put(ifp);
> > }
> > diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
> > index 46cf7be..1f4c096 100644
> > --- a/net/ipv6/ip6_output.c
> > +++ b/net/ipv6/ip6_output.c
> > @@ -930,10 +930,10 @@ static int ip6_dst_lookup_tail(struct sock *sk,
> > goto out_err_release;
> >
> > if (ipv6_addr_any(&fl6->saddr)) {
> > - err = ipv6_dev_get_saddr(net, ip6_dst_idev(*dst)->dev,
> > - &fl6->daddr,
> > - sk ? inet6_sk(sk)->srcprefs : 0,
> > - &fl6->saddr);
> > + struct rt6_info *rt = (struct rt6_info *) *dst;
> > + err = ip6_route_get_saddr(net, rt,&fl6->daddr,
> > + sk ? inet6_sk(sk)->srcprefs : 0,
> > + &fl6->saddr);
> > if (err)
> > goto out_err_release;
> > }
> > diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> > index 843406f..af26cc10 100644
> > --- a/net/ipv6/route.c
> > +++ b/net/ipv6/route.c
> > @@ -1325,6 +1325,16 @@ int ip6_route_add(struct fib6_config *cfg)
> > if (dev == NULL)
> > goto out;
> >
> > + if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
> > + if (!ipv6_chk_addr(net,&cfg->fc_prefsrc, dev, 0)) {
> > + err = -EINVAL;
> > + goto out;
> > + }
> > + ipv6_addr_copy(&rt->rt6i_prefsrc.addr,&cfg->fc_prefsrc);
> > + rt->rt6i_prefsrc.plen = 128;
> > + } else
> > + rt->rt6i_prefsrc.plen = 0;
> > +
> > if (cfg->fc_flags& (RTF_GATEWAY | RTF_NONEXTHOP)) {
> > rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl,&rt->rt6i_gateway, dev);
> > if (IS_ERR(rt->rt6i_nexthop)) {
> > @@ -2037,6 +2047,55 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
> > return rt;
> > }
> >
> > +int ip6_route_get_saddr(struct net *net,
> > + struct rt6_info *rt,
> > + struct in6_addr *daddr,
> > + unsigned int prefs,
> > + struct in6_addr *saddr)
> > +{
> > + struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
> > + int err = 0;
> > + if (rt->rt6i_prefsrc.plen)
> > + ipv6_addr_copy(saddr,&rt->rt6i_prefsrc.addr);
> > + else
> > + err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
> > + daddr, prefs, saddr);
> > + return err;
> > +}
> > +
> > +/* remove deleted ip from prefsrc entries */
> > +struct arg_dev_net_ip {
> > + struct net_device *dev;
> > + struct net *net;
> > + struct in6_addr *addr;
> > +};
> > +
> > +static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
> > +{
> > + struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
> > + struct net *net = ((struct arg_dev_net_ip *)arg)->net;
> > + struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
> > +
> > + if (((void *)rt->rt6i_dev == dev || dev == NULL)&&
> > + rt != net->ipv6.ip6_null_entry&&
> > + ipv6_addr_equal(addr,&rt->rt6i_prefsrc.addr)) {
> > + /* remove prefsrc entry */
> > + rt->rt6i_prefsrc.plen = 0;
> > + }
> > + return 0;
> > +}
> > +
> > +void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
> > +{
> > + struct net *net = dev_net(ifp->idev->dev);
> > + struct arg_dev_net_ip adni = {
> > + .dev = ifp->idev->dev,
> > + .net = net,
> > + .addr =&ifp->addr,
> > + };
> > + fib6_clean_all(net, fib6_remove_prefsrc, 0,&adni);
> > +}
> > +
> > struct arg_dev_net {
> > struct net_device *dev;
> > struct net *net;
> > @@ -2183,6 +2242,9 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
> > nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
> > }
> >
> > + if (tb[RTA_PREFSRC])
> > + nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
> > +
> > if (tb[RTA_OIF])
> > cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
> >
> > @@ -2325,13 +2387,17 @@ static int rt6_fill_node(struct net *net,
> > #endif
> > NLA_PUT_U32(skb, RTA_IIF, iif);
> > } else if (dst) {
> > - struct inet6_dev *idev = ip6_dst_idev(&rt->dst);
> > struct in6_addr saddr_buf;
> > - if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
> > - dst, 0,&saddr_buf) == 0)
> > + if (ip6_route_get_saddr(net, rt, dst, 0,&saddr_buf) == 0)
> > NLA_PUT(skb, RTA_PREFSRC, 16,&saddr_buf);
> > }
> >
> > + if (rt->rt6i_prefsrc.plen) {
> > + struct in6_addr saddr_buf;
> > + ipv6_addr_copy(&saddr_buf,&rt->rt6i_prefsrc.addr);
> > + NLA_PUT(skb, RTA_PREFSRC, 16,&saddr_buf);
> > + }
> > +
> > if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst))< 0)
> > goto nla_put_failure;
>
> What userspace application will be used to set this?
iproute2 already has support for this, since it is using
RTA_PREFSRC for ipv4.
ip -6 r a 2001:db8:a::/64 via 2001:db8:b::1 src 2001:db8:b::2
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