Messages in this thread Patches in this message |  | | | Date | Thu, 21 Aug 2003 00:59:37 +0200 | | From | Willy Tarreau <> | | Subject | Re: [RFC][2.4 PATCH] source address selection for ARP requests |
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On Wed, Aug 20, 2003 at 03:35:48PM -0700, David S. Miller wrote: > On Thu, 21 Aug 2003 00:27:10 +0200 > Willy Tarreau <willy@w.ods.org> wrote: > > > + if (in_dev == NULL) > > + in_dev_put(in_dev); > > What the heck is this? :-)
Hmmm... don't you see ? A copy-paste bug, of course ! Sorry for this, I hope noone's fool enough to use it as-is. I guess it's becoming late, and I'm a bit weak in front of my temptations to use 'dd' .... 'P' in vi ! Here's the fixed one (hand-edited, not tested). At least, I'm happy to see that I'm not the only one reading other's patches :-)
BTW, you didn't tell me if it's necessary to test in_dev->ifa_list. I see that I kept the test in patch 1 but removed it in patch 2.
Willy
patch 1 :
diff -urN linux-2.4.22-rc2/net/ipv4/arp.c linux-2.4.22-rc2-arp/net/ipv4/arp.c --- linux-2.4.22-rc2/net/ipv4/arp.c Fri Aug 1 23:06:29 2003 +++ linux-2.4.22-rc2-arp/net/ipv4/arp.c Thu Aug 21 00:20:19 2003 @@ -320,13 +320,20 @@ u32 saddr; u8 *dst_ha = NULL; struct net_device *dev = neigh->dev; + struct in_device *in_dev = in_dev_get(dev); u32 target = *(u32*)neigh->primary_key; int probes = atomic_read(&neigh->probes); - if (skb && inet_addr_type(skb->nh.iph->saddr) == RTN_LOCAL) + if (in_dev == NULL || in_dev->ifa_list == NULL || + (skb && inet_addr_type(skb->nh.iph->saddr) == RTN_LOCAL && + (IN_DEV_SHARED_MEDIA(in_dev) || + inet_addr_onlink(in_dev, skb->nh.iph->saddr, 0)))) saddr = skb->nh.iph->saddr; else saddr = inet_select_addr(dev, target, RT_SCOPE_LINK); + + if (in_dev != NULL) + in_dev_put(in_dev); if ((probes -= neigh->parms->ucast_probes) < 0) { if (!(neigh->nud_state&NUD_VALID))
patch 2 :
diff -urN linux-2.4.22-rc2/net/ipv4/arp.c linux-2.4.22-rc2-arp2/net/ipv4/arp.c --- linux-2.4.22-rc2/net/ipv4/arp.c Fri Aug 1 23:06:29 2003 +++ linux-2.4.22-rc2-arp2/net/ipv4/arp.c Thu Aug 21 00:24:25 2003 @@ -320,13 +320,19 @@ u32 saddr; u8 *dst_ha = NULL; struct net_device *dev = neigh->dev; + struct in_device *in_dev = in_dev_get(dev); u32 target = *(u32*)neigh->primary_key; int probes = atomic_read(&neigh->probes); - if (skb && inet_addr_type(skb->nh.iph->saddr) == RTN_LOCAL) - saddr = skb->nh.iph->saddr; + if (skb && inet_addr_type(skb->nh.iph->saddr) == RTN_LOCAL && + (in_dev == NULL || IN_DEV_SHARED_MEDIA(in_dev) || + (saddr = inet_select_addr(dev, target, RT_SCOPE_LINK)) == 0)) + saddr = skb->nh.iph->saddr; else saddr = inet_select_addr(dev, target, RT_SCOPE_LINK); + + if (in_dev != NULL) + in_dev_put(in_dev); if ((probes -= neigh->parms->ucast_probes) < 0) { if (!(neigh->nud_state&NUD_VALID))
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