From: YOSHIFUJI Hideaki <hideaki.yoshifuji@miraclelinux.com>
To: Alexander Aring <aar@pengutronix.de>, linux-wpan@vger.kernel.org
Cc: hideaki.yoshifuji@miraclelinux.com, kernel@pengutronix.de,
marcel@holtmann.org, jukka.rissanen@linux.intel.com,
hannes@stressinduktion.org, stefan@osg.samsung.com,
mcr@sandelman.ca, werner@almesberger.net,
linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org,
"David S . Miller" <davem@davemloft.net>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
James Morris <jmorris@namei.org>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Patrick McHardy <kaber@trash.net>
Subject: Re: [RFC 08/12] ipv6: introduce neighbour discovery ops
Date: Wed, 25 May 2016 14:33:09 +0900 [thread overview]
Message-ID: <57453915.6040903@miraclelinux.com> (raw)
In-Reply-To: <1464031328-17524-9-git-send-email-aar@pengutronix.de>
Hi,
Alexander Aring wrote:
> This patch introduces neighbour discovery ops callback structure. The
> idea is to separate the handling for 6LoWPAN into the 6lowpan module.
>
> These callback offers 6lowpan different handling, such as 802.15.4 short
> address handling or RFC6775 (Neighbor Discovery Optimization for IPv6
> over 6LoWPANs).
>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
> Cc: James Morris <jmorris@namei.org>
> Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
> Cc: Patrick McHardy <kaber@trash.net>
> Signed-off-by: Alexander Aring <aar@pengutronix.de>
> ---
> include/linux/netdevice.h | 5 ++
> include/net/ndisc.h | 176 +++++++++++++++++++++++++++++++++++++++++++++-
> net/ipv6/addrconf.c | 9 ++-
> net/ipv6/ndisc.c | 119 +++++++++++++++++++++----------
> net/ipv6/route.c | 14 ++--
> 5 files changed, 275 insertions(+), 48 deletions(-)
>
> @@ -205,6 +376,9 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
> int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev,
> int dir);
>
> +void ndisc_neigh_update(const struct net_device *dev, struct neighbour *neigh,
> + const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
> + struct ndisc_options *ndopts);
>
I prefer ndisc_update().
> /*
> * IGMP
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 393cdbf..4506cac 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -2531,7 +2531,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
>
> if (pinfo->autoconf && in6_dev->cnf.autoconf) {
> struct in6_addr addr;
> - bool tokenized = false;
> + bool tokenized = false, dev_addr_generated = false;
>
> if (pinfo->prefix_len == 64) {
> memcpy(&addr, &pinfo->prefix, 8);
> @@ -2551,6 +2551,8 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
> ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
> in6_dev_put(in6_dev);
> return;
> + } else {
> + dev_addr_generated = true;
> }
> goto ok;
> }
> @@ -2564,6 +2566,11 @@ ok:
> addr_type, addr_flags, sllao,
> tokenized, valid_lft,
> prefered_lft);
> + ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
> + addr_type, addr_flags, sllao,
> + tokenized, valid_lft,
> + prefered_lft,
> + dev_addr_generated);
> }
> inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
> in6_dev_put(in6_dev);
> diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
> index d794d64..99fd53c 100644
> --- a/net/ipv6/ndisc.c
> +++ b/net/ipv6/ndisc.c
> @@ -191,24 +191,28 @@ static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
> return cur <= end && cur->nd_opt_type == type ? cur : NULL;
> }
>
> -static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
> +static inline int ndisc_is_useropt(const struct net_device *dev,
> + struct nd_opt_hdr *opt)
> {
> return opt->nd_opt_type == ND_OPT_RDNSS ||
> - opt->nd_opt_type == ND_OPT_DNSSL;
> + opt->nd_opt_type == ND_OPT_DNSSL ||
> + ndisc_ops_is_useropt(dev, opt->nd_opt_type);
> }
>
> -static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
> +static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev,
> + struct nd_opt_hdr *cur,
> struct nd_opt_hdr *end)
> {
> if (!cur || !end || cur >= end)
> return NULL;
> do {
> cur = ((void *)cur) + (cur->nd_opt_len << 3);
> - } while (cur < end && !ndisc_is_useropt(cur));
> - return cur <= end && ndisc_is_useropt(cur) ? cur : NULL;
> + } while (cur < end && !ndisc_is_useropt(dev, cur));
> + return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL;
> }
>
> -struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
> +struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
> + u8 *opt, int opt_len,
> struct ndisc_options *ndopts)
> {
> struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
> @@ -223,6 +227,8 @@ struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
> l = nd_opt->nd_opt_len << 3;
> if (opt_len < l || l == 0)
> return NULL;
> + if (ndisc_ops_parse_opts(dev, nd_opt, ndopts))
> + goto next_opt;
> switch (nd_opt->nd_opt_type) {
> case ND_OPT_SOURCE_LL_ADDR:
> case ND_OPT_TARGET_LL_ADDR:
> @@ -249,7 +255,7 @@ struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
> break;
> #endif
> default:
> - if (ndisc_is_useropt(nd_opt)) {
> + if (ndisc_is_useropt(dev, nd_opt)) {
> ndopts->nd_useropts_end = nd_opt;
> if (!ndopts->nd_useropts)
> ndopts->nd_useropts = nd_opt;
> @@ -266,6 +272,7 @@ struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
> nd_opt->nd_opt_len);
> }
> }
> +next_opt:
> opt_len -= l;
> nd_opt = ((void *)nd_opt) + l;
> }
> @@ -514,8 +521,11 @@ void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
>
> if (!dev->addr_len)
> inc_opt = 0;
> - if (inc_opt)
> + if (inc_opt) {
> optlen += ndisc_dev_opt_addr_space(dev);
> + optlen += ndisc_ops_opt_space(dev,
> + NDISC_NEIGHBOUR_ADVERTISEMENT);
> + }
>
I think we could call per-device space handler inside
ndisc_dev_opt_addr_space(dev) (or ndisc_opt_addr_space,
in my opinion as I mentioned in 04/12) here by having
extra arugment for it.
> skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
> if (!skb)
> @@ -532,8 +542,10 @@ void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
> .target = *solicited_addr,
> };
>
> - if (inc_opt)
> + if (inc_opt) {
> ndisc_dev_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, dev);
> + ndisc_ops_fill_opts(dev, skb, NDISC_NEIGHBOUR_ADVERTISEMENT);
> + }
>
likewise. And ndisc_ops_fill_addr_option, maybe?
>
> ndisc_send_skb(skb, daddr, src_addr);
> @@ -578,8 +590,11 @@ void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
>
> if (ipv6_addr_any(saddr))
> inc_opt = false;
> - if (inc_opt)
> + if (inc_opt) {
> optlen += ndisc_dev_opt_addr_space(dev);
> + optlen += ndisc_ops_opt_space(dev,
> + NDISC_NEIGHBOUR_SOLICITATION);
> + }
>
> skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
> if (!skb)
> @@ -593,8 +608,10 @@ void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
> .target = *solicit,
> };
>
> - if (inc_opt)
> + if (inc_opt) {
> ndisc_dev_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, dev);
> + ndisc_ops_fill_opts(dev, skb, NDISC_NEIGHBOUR_SOLICITATION);
> + }
>
> ndisc_send_skb(skb, daddr, saddr);
> }
> @@ -629,8 +646,10 @@ void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
> }
> }
> #endif
> - if (send_sllao)
> + if (send_sllao) {
> optlen += ndisc_dev_opt_addr_space(dev);
> + optlen += ndisc_ops_opt_space(dev, NDISC_ROUTER_SOLICITATION);
> + }
>
> skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
> if (!skb)
> @@ -643,8 +662,10 @@ void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
> },
> };
>
> - if (send_sllao)
> + if (send_sllao) {
> ndisc_dev_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, dev);
> + ndisc_ops_fill_opts(dev, skb, NDISC_ROUTER_SOLICITATION);
> + }
>
> ndisc_send_skb(skb, daddr, saddr);
> }
> @@ -705,6 +726,15 @@ static int pndisc_is_router(const void *pkey,
> return ret;
> }
>
> +void ndisc_neigh_update(const struct net_device *dev, struct neighbour *neigh,
> + const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
> + struct ndisc_options *ndopts)
> +{
> + neigh_update(neigh, lladdr, new, flags);
> + /* report ndisc ops about neighbour update */
> + ndisc_ops_neigh_update(dev, neigh, flags, icmp6_type, ndopts);
> +}
> +
> static void ndisc_recv_ns(struct sk_buff *skb)
> {
> struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
> @@ -741,7 +771,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
> return;
> }
>
> - if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
> + if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
> ND_PRINTK(2, warn, "NS: invalid ND options\n");
> return;
> }
> @@ -860,9 +890,10 @@ have_ifp:
> neigh = __neigh_lookup(&nd_tbl, saddr, dev,
> !inc || lladdr || !dev->addr_len);
> if (neigh)
> - neigh_update(neigh, lladdr, NUD_STALE,
> - NEIGH_UPDATE_F_WEAK_OVERRIDE|
> - NEIGH_UPDATE_F_OVERRIDE);
> + ndisc_neigh_update(dev, neigh, lladdr, NUD_STALE,
> + NEIGH_UPDATE_F_WEAK_OVERRIDE|
> + NEIGH_UPDATE_F_OVERRIDE,
> + NDISC_NEIGHBOUR_SOLICITATION, &ndopts);
> if (neigh || !dev->header_ops) {
> ndisc_send_na(dev, saddr, &msg->target, !!is_router,
> true, (ifp != NULL && inc), inc);
> @@ -915,7 +946,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
> idev->cnf.drop_unsolicited_na)
> return;
>
> - if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
> + if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
> ND_PRINTK(2, warn, "NS: invalid ND option\n");
> return;
> }
> @@ -972,12 +1003,13 @@ static void ndisc_recv_na(struct sk_buff *skb)
> goto out;
> }
>
> - neigh_update(neigh, lladdr,
> - msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
> - NEIGH_UPDATE_F_WEAK_OVERRIDE|
> - (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
> - NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
> - (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
> + ndisc_neigh_update(dev, neigh, lladdr,
> + msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
> + NEIGH_UPDATE_F_WEAK_OVERRIDE|
> + (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
> + NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
> + (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0),
> + NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts);
>
> if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
> /*
> @@ -1022,7 +1054,7 @@ static void ndisc_recv_rs(struct sk_buff *skb)
> goto out;
>
> /* Parse ND options */
> - if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
> + if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) {
> ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n");
> goto out;
> }
> @@ -1036,10 +1068,11 @@ static void ndisc_recv_rs(struct sk_buff *skb)
>
> neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
> if (neigh) {
> - neigh_update(neigh, lladdr, NUD_STALE,
> - NEIGH_UPDATE_F_WEAK_OVERRIDE|
> - NEIGH_UPDATE_F_OVERRIDE|
> - NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
> + ndisc_neigh_update(skb->dev, neigh, lladdr, NUD_STALE,
> + NEIGH_UPDATE_F_WEAK_OVERRIDE|
> + NEIGH_UPDATE_F_OVERRIDE|
> + NEIGH_UPDATE_F_OVERRIDE_ISROUTER,
> + NDISC_ROUTER_SOLICITATION, &ndopts);
> neigh_release(neigh);
> }
> out:
> @@ -1140,7 +1173,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
> return;
> }
>
> - if (!ndisc_parse_options(opt, optlen, &ndopts)) {
> + if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) {
> ND_PRINTK(2, warn, "RA: invalid ND options\n");
> return;
> }
> @@ -1334,11 +1367,12 @@ skip_linkparms:
> goto out;
> }
> }
> - neigh_update(neigh, lladdr, NUD_STALE,
> - NEIGH_UPDATE_F_WEAK_OVERRIDE|
> - NEIGH_UPDATE_F_OVERRIDE|
> - NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
> - NEIGH_UPDATE_F_ISROUTER);
> + ndisc_neigh_update(skb->dev, neigh, lladdr, NUD_STALE,
> + NEIGH_UPDATE_F_WEAK_OVERRIDE|
> + NEIGH_UPDATE_F_OVERRIDE|
> + NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
> + NEIGH_UPDATE_F_ISROUTER,
> + NDISC_ROUTER_ADVERTISEMENT, &ndopts);
> }
>
> if (!ipv6_accept_ra(in6_dev)) {
> @@ -1426,7 +1460,8 @@ skip_routeinfo:
> struct nd_opt_hdr *p;
> for (p = ndopts.nd_useropts;
> p;
> - p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
> + p = ndisc_next_useropt(skb->dev, p,
> + ndopts.nd_useropts_end)) {
> ndisc_ra_useropt(skb, p);
> }
> }
> @@ -1464,7 +1499,7 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
> return;
> }
>
> - if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts))
> + if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts))
> return;
>
> if (!ndopts.nd_opts_rh) {
> @@ -1509,7 +1544,8 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
> struct dst_entry *dst;
> struct flowi6 fl6;
> int rd_len;
> - u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
> + u8 ha_buf[MAX_ADDR_LEN], *ha = NULL,
> + ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL;
> int oif = l3mdev_fib_oif(dev);
> bool ret;
>
> @@ -1569,6 +1605,9 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
> read_unlock_bh(&neigh->lock);
> ha = ha_buf;
> optlen += ndisc_dev_opt_addr_space(dev);
> + optlen += ndisc_ops_redirect_opt_space(dev, neigh,
> + ops_data_buf,
> + &ops_data);
> } else
> read_unlock_bh(&neigh->lock);
>
> @@ -1598,10 +1637,12 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
> * include target_address option
> */
>
> - if (ha)
> + if (ha) {
> ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha,
> dev->addr_len,
> ndisc_addr_option_pad(dev->type));
> + ndisc_ops_redirect_fill_addr_option(dev, buff, ops_data);
> + }
>
> /*
> * build redirect option and copy skb over to the new packet.
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index d662cd8..0800a776 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -2200,7 +2200,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
> * first-hop router for the specified ICMP Destination Address.
> */
>
> - if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
> + if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
> net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
> return;
> }
> @@ -2235,12 +2235,12 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
> * We have finally decided to accept it.
> */
>
> - neigh_update(neigh, lladdr, NUD_STALE,
> - NEIGH_UPDATE_F_WEAK_OVERRIDE|
> - NEIGH_UPDATE_F_OVERRIDE|
> - (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
> - NEIGH_UPDATE_F_ISROUTER))
> - );
> + ndisc_neigh_update(skb->dev, neigh, lladdr, NUD_STALE,
> + NEIGH_UPDATE_F_WEAK_OVERRIDE|
> + NEIGH_UPDATE_F_OVERRIDE|
> + (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
> + NEIGH_UPDATE_F_ISROUTER)),
> + NDISC_REDIRECT, &ndopts);
>
> nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
> if (!nrt)
>
--
Hideaki Yoshifuji <hideaki.yoshifuji@miraclelinux.com>
Technical Division, MIRACLE LINUX CORPORATION
next prev parent reply other threads:[~2016-05-25 5:33 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-23 19:21 [RFC 00/12] 6lowpan: introduce 6lowpan-nd Alexander Aring
2016-05-23 19:21 ` [RFC 01/12] 6lowpan: add private neighbour data Alexander Aring
2016-05-23 19:21 ` [RFC 02/12] 6lowpan: add 802.15.4 short addr slaac Alexander Aring
2016-05-23 19:21 ` [RFC 03/12] 6lowpan: remove ipv6 module request Alexander Aring
2016-05-23 19:22 ` [RFC 04/12] ndisc: get rid off dev parameter in ndisc_opt_addr_space Alexander Aring
2016-05-25 5:15 ` YOSHIFUJI Hideaki
2016-05-27 16:56 ` Hannes Frederic Sowa
2016-05-27 18:54 ` Alexander Aring
2016-05-23 19:22 ` [RFC 05/12] ndisc: get rid off dev parameter in ndisc_opt_addr_data Alexander Aring
2016-05-23 19:22 ` [RFC 06/12] ndisc: get rid off dev parameter in ndisc_fill_addr_option Alexander Aring
2016-05-23 19:22 ` [RFC 07/12] addrconf: put prefix address add in an own function Alexander Aring
2016-05-27 9:45 ` Stefan Schmidt
2016-05-27 11:41 ` Alexander Aring
2016-05-27 13:17 ` Stefan Schmidt
2016-05-23 19:22 ` [RFC 08/12] ipv6: introduce neighbour discovery ops Alexander Aring
2016-05-25 5:33 ` YOSHIFUJI Hideaki [this message]
2016-05-23 19:22 ` [RFC 09/12] ipv6: export several functions Alexander Aring
2016-05-27 9:56 ` Stefan Schmidt
2016-05-23 19:22 ` [RFC 10/12] 6lowpan: introduce 6lowpan-nd Alexander Aring
2016-05-27 10:16 ` Stefan Schmidt
2016-05-23 19:22 ` [RFC 11/12] 6lowpan: add support for getting short address Alexander Aring
2016-05-27 10:05 ` Stefan Schmidt
2016-05-27 11:03 ` Alexander Aring
2016-05-27 13:20 ` Stefan Schmidt
2016-05-23 19:22 ` [RFC 12/12] 6lowpan: add support for 802.15.4 short addr handling Alexander Aring
2016-05-25 5:13 ` [RFC 00/12] 6lowpan: introduce 6lowpan-nd YOSHIFUJI Hideaki
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