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Date: Wed, 7 Nov 2007 09:37:26 -0800
From: Stephen Hemminger <shemminger@...ux-foundation.org>
To: "Templin, Fred L" <Fred.L.Templin@...ing.com>
Cc: <netdev@...r.kernel.org>
Subject: Re: [PATCH 03/05] ipv6: RFC4214 Support
On Tue, 6 Nov 2007 17:16:07 -0800
"Templin, Fred L" <Fred.L.Templin@...ing.com> wrote:
> From: Fred L. Templin <fred.l.templin@...ing.com>
>
> This is experimental support for the Intra-Site Automatic
> Tunnel Addressing Protocol (ISATAP) per RFC4214. It uses
> the SIT module, and is configured using the unmodified
> "ip" utility with device names beginning with: "isatap".
>
> The following diffs are specific to the Linux 2.6.23
> kernel distribution.
>
> Signed-off-by: Fred L. Templin <fred.l.templin@...ing.com>
>
> ---
>
> --- linux-2.6.23/net/ipv6/addrconf.c.orig 2007-10-09
> 13:31:38.000000000 -0700
> +++ linux-2.6.23/net/ipv6/addrconf.c 2007-10-31 13:08:45.000000000
> -0700
> @@ -73,7 +73,11 @@
> #include <net/tcp.h>
> #include <net/ip.h>
> #include <net/netlink.h>
> +#if defined(CONFIG_IPV6_ISATAP)
> +#include <net/ipip.h>
> +#else
> #include <linux/if_tunnel.h>
> +#endif
That seems odd, changing includes used based on config option.
> #include <linux/rtnetlink.h>
>
> #ifdef CONFIG_IPV6_PRIVACY
> @@ -1426,6 +1430,11 @@ static int ipv6_generate_eui64(u8 *eui,
> return addrconf_ifid_arcnet(eui, dev);
> case ARPHRD_INFINIBAND:
> return addrconf_ifid_infiniband(eui, dev);
> +#if defined(CONFIG_IPV6_ISATAP)
> + case ARPHRD_SIT:
> + if (dev->priv_flags&IFF_ISATAP)
> + return ipv6_isatap_eui64(eui, (__be32 *)dev->dev_addr);
> +#endif
Missing indentation
> }
> return -1;
> }
> @@ -2138,7 +2147,6 @@ static void addrconf_add_linklocal(struc
> addr_flags |= IFA_F_OPTIMISTIC;
> #endif
>
> -
avoid random whitespace changes
> ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
> if (!IS_ERR(ifp)) {
> addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
> idev->dev, 0, 0);
> @@ -2192,6 +2200,32 @@ static void addrconf_sit_config(struct n
> return;
> }
>
> +#if defined(CONFIG_IPV6_ISATAP)
> + /* ISATAP (RFC4214) - configure as NBMA link */
> + if (dev->priv_flags&IFF_ISATAP) {
missing spaces around & operator
> + struct in6_addr addr;
> +
> + addrconf_add_lroute(dev);
> +
> + addr.s6_addr32[0] = htonl(0xFE800000);
shouldn't this be defined somewhere rather than hardcoded
magic constant?
> + addr.s6_addr32[1] = 0;
> +
> + if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) {
> + struct inet6_ifaddr *ifp;
> +
> + if (!IS_ERR(ifp = ipv6_add_addr(idev, &addr, 64,
> + IFA_LINK, IFA_F_PERMANENT))) {
split assignment and conditional please
> + addrconf_prefix_route(&ifp->addr,
> ifp->prefix_len,
> + idev->dev, 0, 0);
> + addrconf_dad_start(ifp, 0);
> + in6_ifa_put(ifp);
> + }
> + }
> +
> + return;
> + }
> +#endif
> +
> sit_add_v4_addrs(idev);
>
> if (dev->flags&IFF_POINTOPOINT) {
> @@ -2521,6 +2555,16 @@ static void addrconf_rs_timer(unsigned l
> * Announcement received after solicitation
> * was sent
> */
> +#if defined(CONFIG_IPV6_ISATAP)
> + /* ISATAP (RFC4214) - Re-DAD to trigger new RS/RA */
> + if (ifp->idev->dev->priv_flags & IFF_ISATAP) {
> + spin_lock(&ifp->lock);
> + ifp->probes = 0;
> + ifp->idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
> + addrconf_mod_timer(ifp, AC_DAD, HZ*120);
> + spin_unlock(&ifp->lock);
> + }
> +#endif
> goto out;
> }
>
> @@ -2535,10 +2579,32 @@ static void addrconf_rs_timer(unsigned l
> ifp->idev->cnf.rtr_solicit_interval);
> spin_unlock(&ifp->lock);
>
> +#if defined(CONFIG_IPV6_ISATAP)
> + /* ISATAP (RFC4214) - unicast RS */
> + if (ifp->idev->dev->priv_flags & IFF_ISATAP) {
> + struct ip_tunnel *t = netdev_priv(ifp->idev->dev);
Please follow kernel indentation standard of tabs (not 4 spaces).
> + __be32 rtr = t->parms.i_key;
> +
> + if (!rtr) goto out;
> +
> + all_routers.s6_addr32[0] = htonl(0xFE800000);
> + all_routers.s6_addr32[1] = 0;
> + ipv6_isatap_eui64(all_routers.s6_addr + 8, &rtr);
> +
> + } else
> +#endif
> ipv6_addr_all_routers(&all_routers);
>
> ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
> } else {
> +#if defined(CONFIG_IPV6_ISATAP)
> + /* ISATAP (RFC4214) - Re-DAD to trigger new RS/RA */
> + if (ifp->idev->dev->priv_flags & IFF_ISATAP) {
> + ifp->probes = 0;
> + ifp->idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
> + addrconf_mod_timer(ifp, AC_DAD, HZ*120);
> + }
> +#endif
> spin_unlock(&ifp->lock);
> /*
> * Note: we do not support deprecated "all on-link"
> @@ -2584,6 +2650,9 @@ static void addrconf_dad_start(struct in
> spin_lock_bh(&ifp->lock);
>
> if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
> +#if defined(CONFIG_IPV6_ISATAP)
> + dev->priv_flags&IFF_ISATAP ||
> +#endif
> !(ifp->flags&IFA_F_TENTATIVE) ||
> ifp->flags & IFA_F_NODAD) {
> ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
> @@ -2680,6 +2749,20 @@ static void addrconf_dad_completed(struc
> (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
> struct in6_addr all_routers;
>
> +#if defined(CONFIG_IPV6_ISATAP)
> + /* ISATAP (RFC4214) - unicast RS */
> + if (ifp->idev->dev->priv_flags & IFF_ISATAP) {
> + struct ip_tunnel *t = netdev_priv(ifp->idev->dev);
> + __be32 rtr = t->parms.i_key;
> +
> + if (!rtr) return;
> +
> + all_routers.s6_addr32[0] = htonl(0xFE800000);
> + all_routers.s6_addr32[1] = 0;
> + ipv6_isatap_eui64(all_routers.s6_addr + 8, &rtr);
> +
> + } else
> +#endif
> ipv6_addr_all_routers(&all_routers);
>
> /*
> -
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--
Stephen Hemminger <shemminger@...ux-foundation.org>
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