From cf958ae377ee2545ae70cf48d38e7eb4308c27ea Mon Sep 17 00:00:00 2001 From: Benjamin Thery Date: Thu, 22 Jan 2009 04:56:16 +0000 Subject: netns: ipmr: dynamically allocate vif_table Preliminary work to make IPv6 multicast routing netns-aware. Dynamically allocate interface table vif_table and move it to struct netns_ipv4, and update MIF_EXISTS() macro. At the moment, vif_table is only referenced in init_net. Signed-off-by: Benjamin Thery Signed-off-by: David S. Miller --- net/ipv4/ipmr.c | 109 +++++++++++++++++++++++++++++++++++--------------------- 1 file changed, 68 insertions(+), 41 deletions(-) (limited to 'net') diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index ac324b702e8..75a5f79cc22 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -77,10 +77,7 @@ static DEFINE_RWLOCK(mrt_lock); * Multicast router control variables */ -static struct vif_device vif_table[MAXVIFS]; /* Devices */ -static int maxvif; - -#define VIF_EXISTS(idx) (vif_table[idx].dev != NULL) +#define VIF_EXISTS(_net, _idx) ((_net)->ipv4.vif_table[_idx].dev != NULL) static int mroute_do_assert; /* Set in PIM assert */ static int mroute_do_pim; @@ -286,10 +283,10 @@ static int vif_delete(int vifi, int notify) struct net_device *dev; struct in_device *in_dev; - if (vifi < 0 || vifi >= maxvif) + if (vifi < 0 || vifi >= init_net.ipv4.maxvif) return -EADDRNOTAVAIL; - v = &vif_table[vifi]; + v = &init_net.ipv4.vif_table[vifi]; write_lock_bh(&mrt_lock); dev = v->dev; @@ -305,13 +302,13 @@ static int vif_delete(int vifi, int notify) reg_vif_num = -1; #endif - if (vifi+1 == maxvif) { + if (vifi+1 == init_net.ipv4.maxvif) { int tmp; for (tmp=vifi-1; tmp>=0; tmp--) { - if (VIF_EXISTS(tmp)) + if (VIF_EXISTS(&init_net, tmp)) break; } - maxvif = tmp+1; + init_net.ipv4.maxvif = tmp+1; } write_unlock_bh(&mrt_lock); @@ -411,8 +408,9 @@ static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) cache->mfc_un.res.maxvif = 0; memset(cache->mfc_un.res.ttls, 255, MAXVIFS); - for (vifi=0; vifimfc_un.res.ttls[vifi] = ttls[vifi]; if (cache->mfc_un.res.minvif > vifi) cache->mfc_un.res.minvif = vifi; @@ -425,13 +423,13 @@ static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) static int vif_add(struct vifctl *vifc, int mrtsock) { int vifi = vifc->vifc_vifi; - struct vif_device *v = &vif_table[vifi]; + struct vif_device *v = &init_net.ipv4.vif_table[vifi]; struct net_device *dev; struct in_device *in_dev; int err; /* Is vif busy ? */ - if (VIF_EXISTS(vifi)) + if (VIF_EXISTS(&init_net, vifi)) return -EADDRINUSE; switch (vifc->vifc_flags) { @@ -509,8 +507,8 @@ static int vif_add(struct vifctl *vifc, int mrtsock) if (v->flags&VIFF_REGISTER) reg_vif_num = vifi; #endif - if (vifi+1 > maxvif) - maxvif = vifi+1; + if (vifi+1 > init_net.ipv4.maxvif) + init_net.ipv4.maxvif = vifi+1; write_unlock_bh(&mrt_lock); return 0; } @@ -849,8 +847,8 @@ static void mroute_clean_tables(struct sock *sk) /* * Shut down all active vif entries */ - for (i=0; i= maxvif) + if (vr.vifi >= init_net.ipv4.maxvif) return -EINVAL; read_lock(&mrt_lock); - vif=&vif_table[vr.vifi]; - if (VIF_EXISTS(vr.vifi)) { + vif = &init_net.ipv4.vif_table[vr.vifi]; + if (VIF_EXISTS(&init_net, vr.vifi)) { vr.icount = vif->pkt_in; vr.ocount = vif->pkt_out; vr.ibytes = vif->bytes_in; @@ -1140,8 +1138,8 @@ static int ipmr_device_event(struct notifier_block *this, unsigned long event, v if (event != NETDEV_UNREGISTER) return NOTIFY_DONE; - v=&vif_table[0]; - for (ct=0; ctdev == dev) vif_delete(ct, 1); } @@ -1204,7 +1202,7 @@ static inline int ipmr_forward_finish(struct sk_buff *skb) static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) { const struct iphdr *iph = ip_hdr(skb); - struct vif_device *vif = &vif_table[vifi]; + struct vif_device *vif = &init_net.ipv4.vif_table[vifi]; struct net_device *dev; struct rtable *rt; int encap = 0; @@ -1305,8 +1303,8 @@ out_free: static int ipmr_find_vif(struct net_device *dev) { int ct; - for (ct=maxvif-1; ct>=0; ct--) { - if (vif_table[ct].dev == dev) + for (ct = init_net.ipv4.maxvif-1; ct >= 0; ct--) { + if (init_net.ipv4.vif_table[ct].dev == dev) break; } return ct; @@ -1326,7 +1324,7 @@ static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local /* * Wrong interface: drop packet and (maybe) send PIM assert. */ - if (vif_table[vif].dev != skb->dev) { + if (init_net.ipv4.vif_table[vif].dev != skb->dev) { int true_vifi; if (skb->rtable->fl.iif == 0) { @@ -1362,8 +1360,8 @@ static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local goto dont_forward; } - vif_table[vif].pkt_in++; - vif_table[vif].bytes_in += skb->len; + init_net.ipv4.vif_table[vif].pkt_in++; + init_net.ipv4.vif_table[vif].bytes_in += skb->len; /* * Forward the frame @@ -1500,7 +1498,7 @@ static int __pim_rcv(struct sk_buff *skb, unsigned int pimlen) read_lock(&mrt_lock); if (reg_vif_num >= 0) - reg_dev = vif_table[reg_vif_num].dev; + reg_dev = init_net.ipv4.vif_table[reg_vif_num].dev; if (reg_dev) dev_hold(reg_dev); read_unlock(&mrt_lock); @@ -1581,7 +1579,7 @@ ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) { int ct; struct rtnexthop *nhp; - struct net_device *dev = vif_table[c->mfc_parent].dev; + struct net_device *dev = init_net.ipv4.vif_table[c->mfc_parent].dev; u8 *b = skb_tail_pointer(skb); struct rtattr *mp_head; @@ -1597,7 +1595,7 @@ ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); nhp->rtnh_flags = 0; nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; - nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; + nhp->rtnh_ifindex = init_net.ipv4.vif_table[ct].dev->ifindex; nhp->rtnh_len = sizeof(*nhp); } } @@ -1672,11 +1670,11 @@ struct ipmr_vif_iter { static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, loff_t pos) { - for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { - if (!VIF_EXISTS(iter->ct)) + for (iter->ct = 0; iter->ct < init_net.ipv4.maxvif; ++iter->ct) { + if (!VIF_EXISTS(&init_net, iter->ct)) continue; if (pos-- == 0) - return &vif_table[iter->ct]; + return &init_net.ipv4.vif_table[iter->ct]; } return NULL; } @@ -1697,10 +1695,10 @@ static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) if (v == SEQ_START_TOKEN) return ipmr_vif_seq_idx(iter, 0); - while (++iter->ct < maxvif) { - if (!VIF_EXISTS(iter->ct)) + while (++iter->ct < init_net.ipv4.maxvif) { + if (!VIF_EXISTS(&init_net, iter->ct)) continue; - return &vif_table[iter->ct]; + return &init_net.ipv4.vif_table[iter->ct]; } return NULL; } @@ -1722,7 +1720,7 @@ static int ipmr_vif_seq_show(struct seq_file *seq, void *v) seq_printf(seq, "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", - vif - vif_table, + vif - init_net.ipv4.vif_table, name, vif->bytes_in, vif->pkt_in, vif->bytes_out, vif->pkt_out, vif->flags, vif->local, vif->remote); @@ -1864,9 +1862,9 @@ static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) mfc->mfc_un.res.wrong_if); for (n = mfc->mfc_un.res.minvif; n < mfc->mfc_un.res.maxvif; n++ ) { - if (VIF_EXISTS(n) - && mfc->mfc_un.res.ttls[n] < 255) - seq_printf(seq, + if (VIF_EXISTS(&init_net, n) && + mfc->mfc_un.res.ttls[n] < 255) + seq_printf(seq, " %2d:%-3d", n, mfc->mfc_un.res.ttls[n]); } @@ -1913,6 +1911,29 @@ static struct net_protocol pim_protocol = { /* * Setup for IP multicast routing */ +static int __net_init ipmr_net_init(struct net *net) +{ + int err = 0; + + net->ipv4.vif_table = kcalloc(MAXVIFS, sizeof(struct vif_device), + GFP_KERNEL); + if (!net->ipv4.vif_table) { + err = -ENOMEM; + goto fail; + } +fail: + return err; +} + +static void __net_exit ipmr_net_exit(struct net *net) +{ + kfree(net->ipv4.vif_table); +} + +static struct pernet_operations ipmr_net_ops = { + .init = ipmr_net_init, + .exit = ipmr_net_exit, +}; int __init ip_mr_init(void) { @@ -1925,6 +1946,10 @@ int __init ip_mr_init(void) if (!mrt_cachep) return -ENOMEM; + err = register_pernet_subsys(&ipmr_net_ops); + if (err) + goto reg_pernet_fail; + setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); err = register_netdevice_notifier(&ip_mr_notifier); if (err) @@ -1945,6 +1970,8 @@ proc_vif_fail: #endif reg_notif_fail: del_timer(&ipmr_expire_timer); + unregister_pernet_subsys(&ipmr_net_ops); +reg_pernet_fail: kmem_cache_destroy(mrt_cachep); return err; } -- cgit v1.2.3