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https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
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ipmr: cleanups
Various code style cleanups Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
David S. Miller
parent
a8c9486b81
commit
a8cb16dd9c
186
net/ipv4/ipmr.c
186
net/ipv4/ipmr.c
@ -98,7 +98,7 @@ struct ipmr_result {
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};
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/* Big lock, protecting vif table, mrt cache and mroute socket state.
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Note that the changes are semaphored via rtnl_lock.
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* Note that the changes are semaphored via rtnl_lock.
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*/
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static DEFINE_RWLOCK(mrt_lock);
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@ -113,11 +113,11 @@ static DEFINE_RWLOCK(mrt_lock);
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static DEFINE_SPINLOCK(mfc_unres_lock);
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/* We return to original Alan's scheme. Hash table of resolved
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entries is changed only in process context and protected
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with weak lock mrt_lock. Queue of unresolved entries is protected
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with strong spinlock mfc_unres_lock.
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In this case data path is free of exclusive locks at all.
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* entries is changed only in process context and protected
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* with weak lock mrt_lock. Queue of unresolved entries is protected
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* with strong spinlock mfc_unres_lock.
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*
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* In this case data path is free of exclusive locks at all.
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*/
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static struct kmem_cache *mrt_cachep __read_mostly;
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@ -396,9 +396,9 @@ struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
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set_fs(KERNEL_DS);
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err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
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set_fs(oldfs);
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} else
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} else {
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err = -EOPNOTSUPP;
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}
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dev = NULL;
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if (err == 0 &&
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@ -495,7 +495,8 @@ static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
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dev->iflink = 0;
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rcu_read_lock();
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if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
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in_dev = __in_dev_get_rcu(dev);
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if (!in_dev) {
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rcu_read_unlock();
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goto failure;
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}
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@ -554,6 +555,7 @@ static int vif_delete(struct mr_table *mrt, int vifi, int notify,
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if (vifi + 1 == mrt->maxvif) {
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int tmp;
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for (tmp = vifi - 1; tmp >= 0; tmp--) {
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if (VIF_EXISTS(mrt, tmp))
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break;
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@ -565,7 +567,8 @@ static int vif_delete(struct mr_table *mrt, int vifi, int notify,
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dev_set_allmulti(dev, -1);
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if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
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in_dev = __in_dev_get_rtnl(dev);
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if (in_dev) {
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IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
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ip_rt_multicast_event(in_dev);
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}
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@ -590,7 +593,7 @@ static inline void ipmr_cache_free(struct mfc_cache *c)
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}
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/* Destroy an unresolved cache entry, killing queued skbs
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and reporting error to netlink readers.
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* and reporting error to netlink readers.
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*/
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static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
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@ -612,9 +615,10 @@ static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
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memset(&e->msg, 0, sizeof(e->msg));
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rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
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} else
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} else {
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kfree_skb(skb);
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}
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}
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ipmr_cache_free(c);
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}
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@ -735,9 +739,9 @@ static int vif_add(struct net *net, struct mr_table *mrt,
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dev_put(dev);
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return -EADDRNOTAVAIL;
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}
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} else
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} else {
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dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
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}
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if (!dev)
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return -EADDRNOTAVAIL;
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err = dev_set_allmulti(dev, 1);
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@ -750,16 +754,16 @@ static int vif_add(struct net *net, struct mr_table *mrt,
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return -EINVAL;
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}
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if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) {
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in_dev = __in_dev_get_rtnl(dev);
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if (!in_dev) {
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dev_put(dev);
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return -EADDRNOTAVAIL;
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}
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IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
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ip_rt_multicast_event(in_dev);
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/*
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* Fill in the VIF structures
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*/
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/* Fill in the VIF structures */
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v->rate_limit = vifc->vifc_rate_limit;
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v->local = vifc->vifc_lcl_addr.s_addr;
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v->remote = vifc->vifc_rmt_addr.s_addr;
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@ -836,17 +840,15 @@ static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
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struct sk_buff *skb;
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struct nlmsgerr *e;
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/*
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* Play the pending entries through our router
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*/
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/* Play the pending entries through our router */
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while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
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if (ip_hdr(skb)->version == 0) {
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struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
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if (__ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) {
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nlh->nlmsg_len = (skb_tail_pointer(skb) -
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(u8 *)nlh);
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nlh->nlmsg_len = skb_tail_pointer(skb) -
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(u8 *)nlh;
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} else {
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nlh->nlmsg_type = NLMSG_ERROR;
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nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
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@ -857,10 +859,11 @@ static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
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}
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rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
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} else
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} else {
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ip_mr_forward(net, mrt, skb, c, 0);
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}
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}
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}
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/*
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* Bounce a cache query up to mrouted. We could use netlink for this but mrouted
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@ -892,9 +895,9 @@ static int ipmr_cache_report(struct mr_table *mrt,
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#ifdef CONFIG_IP_PIMSM
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if (assert == IGMPMSG_WHOLEPKT) {
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/* Ugly, but we have no choice with this interface.
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Duplicate old header, fix ihl, length etc.
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And all this only to mangle msg->im_msgtype and
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to set msg->im_mbz to "mbz" :-)
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* Duplicate old header, fix ihl, length etc.
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* And all this only to mangle msg->im_msgtype and
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* to set msg->im_mbz to "mbz" :-)
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*/
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skb_push(skb, sizeof(struct iphdr));
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skb_reset_network_header(skb);
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@ -911,9 +914,7 @@ static int ipmr_cache_report(struct mr_table *mrt,
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#endif
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{
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/*
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* Copy the IP header
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*/
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/* Copy the IP header */
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skb->network_header = skb->tail;
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skb_put(skb, ihl);
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@ -923,9 +924,7 @@ static int ipmr_cache_report(struct mr_table *mrt,
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msg->im_vif = vifi;
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skb_dst_set(skb, dst_clone(skb_dst(pkt)));
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/*
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* Add our header
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*/
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/* Add our header */
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igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
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igmp->type =
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@ -943,9 +942,8 @@ static int ipmr_cache_report(struct mr_table *mrt,
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return -EINVAL;
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}
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/*
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* Deliver to mrouted
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*/
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/* Deliver to mrouted */
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ret = sock_queue_rcv_skb(mroute_sk, skb);
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rcu_read_unlock();
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if (ret < 0) {
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@ -979,9 +977,7 @@ ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
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}
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if (!found) {
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/*
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* Create a new entry if allowable
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*/
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/* Create a new entry if allowable */
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if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
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(c = ipmr_cache_alloc_unres()) == NULL) {
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@ -991,16 +987,14 @@ ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
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return -ENOBUFS;
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}
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/*
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* Fill in the new cache entry
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*/
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/* Fill in the new cache entry */
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c->mfc_parent = -1;
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c->mfc_origin = iph->saddr;
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c->mfc_mcastgrp = iph->daddr;
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/*
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* Reflect first query at mrouted.
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*/
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/* Reflect first query at mrouted. */
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err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
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if (err < 0) {
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/* If the report failed throw the cache entry
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@ -1020,9 +1014,8 @@ ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
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mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
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}
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/*
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* See if we can append the packet
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*/
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/* See if we can append the packet */
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if (c->mfc_un.unres.unresolved.qlen > 3) {
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kfree_skb(skb);
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err = -ENOBUFS;
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@ -1140,18 +1133,16 @@ static void mroute_clean_tables(struct mr_table *mrt)
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LIST_HEAD(list);
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struct mfc_cache *c, *next;
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/*
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* Shut down all active vif entries
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*/
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/* Shut down all active vif entries */
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for (i = 0; i < mrt->maxvif; i++) {
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if (!(mrt->vif_table[i].flags & VIFF_STATIC))
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vif_delete(mrt, i, 0, &list);
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}
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unregister_netdevice_many(&list);
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/*
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* Wipe the cache
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*/
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/* Wipe the cache */
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for (i = 0; i < MFC_LINES; i++) {
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list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) {
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if (c->mfc_flags & MFC_STATIC)
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@ -1544,21 +1535,33 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
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#endif
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if (vif->flags & VIFF_TUNNEL) {
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struct flowi fl = { .oif = vif->link,
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.nl_u = { .ip4_u =
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{ .daddr = vif->remote,
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struct flowi fl = {
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.oif = vif->link,
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.nl_u = {
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.ip4_u = {
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.daddr = vif->remote,
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.saddr = vif->local,
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.tos = RT_TOS(iph->tos) } },
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.proto = IPPROTO_IPIP };
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.tos = RT_TOS(iph->tos)
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}
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},
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.proto = IPPROTO_IPIP
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};
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if (ip_route_output_key(net, &rt, &fl))
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goto out_free;
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encap = sizeof(struct iphdr);
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} else {
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struct flowi fl = { .oif = vif->link,
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.nl_u = { .ip4_u =
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{ .daddr = iph->daddr,
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.tos = RT_TOS(iph->tos) } },
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.proto = IPPROTO_IPIP };
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struct flowi fl = {
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.oif = vif->link,
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.nl_u = {
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.ip4_u = {
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.daddr = iph->daddr,
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.tos = RT_TOS(iph->tos)
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}
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},
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.proto = IPPROTO_IPIP
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};
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if (ip_route_output_key(net, &rt, &fl))
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goto out_free;
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}
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@ -1567,8 +1570,8 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
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if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
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/* Do not fragment multicasts. Alas, IPv4 does not
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allow to send ICMP, so that packets will disappear
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to blackhole.
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* allow to send ICMP, so that packets will disappear
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* to blackhole.
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*/
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IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
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@ -1591,7 +1594,8 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
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ip_decrease_ttl(ip_hdr(skb));
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/* FIXME: forward and output firewalls used to be called here.
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* What do we do with netfilter? -- RR */
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* What do we do with netfilter? -- RR
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*/
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if (vif->flags & VIFF_TUNNEL) {
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ip_encap(skb, vif->local, vif->remote);
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/* FIXME: extra output firewall step used to be here. --RR */
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@ -1652,15 +1656,15 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
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if (skb_rtable(skb)->fl.iif == 0) {
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/* It is our own packet, looped back.
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Very complicated situation...
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The best workaround until routing daemons will be
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fixed is not to redistribute packet, if it was
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send through wrong interface. It means, that
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multicast applications WILL NOT work for
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(S,G), which have default multicast route pointing
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to wrong oif. In any case, it is not a good
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idea to use multicasting applications on router.
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* Very complicated situation...
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*
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* The best workaround until routing daemons will be
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* fixed is not to redistribute packet, if it was
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* send through wrong interface. It means, that
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* multicast applications WILL NOT work for
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* (S,G), which have default multicast route pointing
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* to wrong oif. In any case, it is not a good
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* idea to use multicasting applications on router.
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*/
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goto dont_forward;
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}
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@ -1670,9 +1674,9 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
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if (true_vifi >= 0 && mrt->mroute_do_assert &&
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/* pimsm uses asserts, when switching from RPT to SPT,
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so that we cannot check that packet arrived on an oif.
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It is bad, but otherwise we would need to move pretty
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large chunk of pimd to kernel. Ough... --ANK
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* so that we cannot check that packet arrived on an oif.
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* It is bad, but otherwise we would need to move pretty
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* large chunk of pimd to kernel. Ough... --ANK
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*/
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(mrt->mroute_do_pim ||
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cache->mfc_un.res.ttls[true_vifi] < 255) &&
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@ -1690,10 +1694,12 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
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/*
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* Forward the frame
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*/
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for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) {
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for (ct = cache->mfc_un.res.maxvif - 1;
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ct >= cache->mfc_un.res.minvif; ct--) {
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if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
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if (psend != -1) {
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struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
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if (skb2)
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ipmr_queue_xmit(net, mrt, skb2, cache,
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psend);
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@ -1704,6 +1710,7 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
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if (psend != -1) {
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if (local) {
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struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
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if (skb2)
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ipmr_queue_xmit(net, mrt, skb2, cache, psend);
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} else {
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@ -1733,7 +1740,7 @@ int ip_mr_input(struct sk_buff *skb)
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int err;
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/* Packet is looped back after forward, it should not be
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forwarded second time, but still can be delivered locally.
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* forwarded second time, but still can be delivered locally.
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*/
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if (IPCB(skb)->flags & IPSKB_FORWARDED)
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goto dont_forward;
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@ -1822,10 +1829,10 @@ static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
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encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
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/*
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Check that:
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a. packet is really destinted to a multicast group
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b. packet is not a NULL-REGISTER
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c. packet is not truncated
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* Check that:
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* a. packet is really sent to a multicast group
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* b. packet is not a NULL-REGISTER
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* c. packet is not truncated
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*/
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if (!ipv4_is_multicast(encap->daddr) ||
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encap->tot_len == 0 ||
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@ -1971,7 +1978,7 @@ int ipmr_get_route(struct net *net,
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struct sk_buff *skb2;
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struct iphdr *iph;
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struct net_device *dev;
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int vif;
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int vif = -1;
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if (nowait) {
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rcu_read_unlock();
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@ -1980,7 +1987,9 @@ int ipmr_get_route(struct net *net,
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dev = skb->dev;
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||||
read_lock(&mrt_lock);
|
||||
if (dev == NULL || (vif = ipmr_find_vif(mrt, dev)) < 0) {
|
||||
if (dev)
|
||||
vif = ipmr_find_vif(mrt, dev);
|
||||
if (vif < 0) {
|
||||
read_unlock(&mrt_lock);
|
||||
rcu_read_unlock();
|
||||
return -ENODEV;
|
||||
@ -2098,7 +2107,8 @@ done:
|
||||
|
||||
#ifdef CONFIG_PROC_FS
|
||||
/*
|
||||
* The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif
|
||||
* The /proc interfaces to multicast routing :
|
||||
* /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
|
||||
*/
|
||||
struct ipmr_vif_iter {
|
||||
struct seq_net_private p;
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user