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Message-ID: <1285985729.2582.525.camel@edumazet-laptop>
Date: Sat, 02 Oct 2010 04:15:29 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: David Miller <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next 4/4] ipmr: cleanups
Various code style cleanups
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
net/ipv4/ipmr.c | 238 +++++++++++++++++++++++-----------------------
1 file changed, 124 insertions(+), 114 deletions(-)
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index cbb6dab..86dd569 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -98,7 +98,7 @@ struct ipmr_result {
};
/* Big lock, protecting vif table, mrt cache and mroute socket state.
- Note that the changes are semaphored via rtnl_lock.
+ * Note that the changes are semaphored via rtnl_lock.
*/
static DEFINE_RWLOCK(mrt_lock);
@@ -113,11 +113,11 @@ static DEFINE_RWLOCK(mrt_lock);
static DEFINE_SPINLOCK(mfc_unres_lock);
/* We return to original Alan's scheme. Hash table of resolved
- entries is changed only in process context and protected
- with weak lock mrt_lock. Queue of unresolved entries is protected
- with strong spinlock mfc_unres_lock.
-
- In this case data path is free of exclusive locks at all.
+ * entries is changed only in process context and protected
+ * with weak lock mrt_lock. Queue of unresolved entries is protected
+ * with strong spinlock mfc_unres_lock.
+ *
+ * In this case data path is free of exclusive locks at all.
*/
static struct kmem_cache *mrt_cachep __read_mostly;
@@ -396,9 +396,9 @@ struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
set_fs(KERNEL_DS);
err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
set_fs(oldfs);
- } else
+ } else {
err = -EOPNOTSUPP;
-
+ }
dev = NULL;
if (err == 0 &&
@@ -495,7 +495,8 @@ static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
dev->iflink = 0;
rcu_read_lock();
- if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
+ in_dev = __in_dev_get_rcu(dev);
+ if (!in_dev) {
rcu_read_unlock();
goto failure;
}
@@ -552,9 +553,10 @@ static int vif_delete(struct mr_table *mrt, int vifi, int notify,
mrt->mroute_reg_vif_num = -1;
#endif
- if (vifi+1 == mrt->maxvif) {
+ if (vifi + 1 == mrt->maxvif) {
int tmp;
- for (tmp=vifi-1; tmp>=0; tmp--) {
+
+ for (tmp = vifi - 1; tmp >= 0; tmp--) {
if (VIF_EXISTS(mrt, tmp))
break;
}
@@ -565,12 +567,13 @@ static int vif_delete(struct mr_table *mrt, int vifi, int notify,
dev_set_allmulti(dev, -1);
- if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
+ in_dev = __in_dev_get_rtnl(dev);
+ if (in_dev) {
IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
ip_rt_multicast_event(in_dev);
}
- if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify)
+ if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
unregister_netdevice_queue(dev, head);
dev_put(dev);
@@ -590,7 +593,7 @@ static inline void ipmr_cache_free(struct mfc_cache *c)
}
/* Destroy an unresolved cache entry, killing queued skbs
- and reporting error to netlink readers.
+ * and reporting error to netlink readers.
*/
static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
@@ -612,8 +615,9 @@ static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
memset(&e->msg, 0, sizeof(e->msg));
rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
- } else
+ } else {
kfree_skb(skb);
+ }
}
ipmr_cache_free(c);
@@ -735,9 +739,9 @@ static int vif_add(struct net *net, struct mr_table *mrt,
dev_put(dev);
return -EADDRNOTAVAIL;
}
- } else
+ } else {
dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
-
+ }
if (!dev)
return -EADDRNOTAVAIL;
err = dev_set_allmulti(dev, 1);
@@ -750,16 +754,16 @@ static int vif_add(struct net *net, struct mr_table *mrt,
return -EINVAL;
}
- if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) {
+ in_dev = __in_dev_get_rtnl(dev);
+ if (!in_dev) {
dev_put(dev);
return -EADDRNOTAVAIL;
}
IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
ip_rt_multicast_event(in_dev);
- /*
- * Fill in the VIF structures
- */
+ /* Fill in the VIF structures */
+
v->rate_limit = vifc->vifc_rate_limit;
v->local = vifc->vifc_lcl_addr.s_addr;
v->remote = vifc->vifc_rmt_addr.s_addr;
@@ -772,14 +776,14 @@ static int vif_add(struct net *net, struct mr_table *mrt,
v->pkt_in = 0;
v->pkt_out = 0;
v->link = dev->ifindex;
- if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER))
+ if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER))
v->link = dev->iflink;
/* And finish update writing critical data */
write_lock_bh(&mrt_lock);
v->dev = dev;
#ifdef CONFIG_IP_PIMSM
- if (v->flags&VIFF_REGISTER)
+ if (v->flags & VIFF_REGISTER)
mrt->mroute_reg_vif_num = vifi;
#endif
if (vifi+1 > mrt->maxvif)
@@ -836,17 +840,15 @@ static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
struct sk_buff *skb;
struct nlmsgerr *e;
- /*
- * Play the pending entries through our router
- */
+ /* Play the pending entries through our router */
while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
if (ip_hdr(skb)->version == 0) {
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
if (__ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) {
- nlh->nlmsg_len = (skb_tail_pointer(skb) -
- (u8 *)nlh);
+ nlh->nlmsg_len = skb_tail_pointer(skb) -
+ (u8 *)nlh;
} else {
nlh->nlmsg_type = NLMSG_ERROR;
nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
@@ -857,8 +859,9 @@ static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
}
rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
- } else
+ } else {
ip_mr_forward(net, mrt, skb, c, 0);
+ }
}
}
@@ -892,9 +895,9 @@ static int ipmr_cache_report(struct mr_table *mrt,
#ifdef CONFIG_IP_PIMSM
if (assert == IGMPMSG_WHOLEPKT) {
/* Ugly, but we have no choice with this interface.
- Duplicate old header, fix ihl, length etc.
- And all this only to mangle msg->im_msgtype and
- to set msg->im_mbz to "mbz" :-)
+ * Duplicate old header, fix ihl, length etc.
+ * And all this only to mangle msg->im_msgtype and
+ * to set msg->im_mbz to "mbz" :-)
*/
skb_push(skb, sizeof(struct iphdr));
skb_reset_network_header(skb);
@@ -911,27 +914,23 @@ static int ipmr_cache_report(struct mr_table *mrt,
#endif
{
- /*
- * Copy the IP header
- */
+ /* Copy the IP header */
skb->network_header = skb->tail;
skb_put(skb, ihl);
skb_copy_to_linear_data(skb, pkt->data, ihl);
- ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */
+ ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */
msg = (struct igmpmsg *)skb_network_header(skb);
msg->im_vif = vifi;
skb_dst_set(skb, dst_clone(skb_dst(pkt)));
- /*
- * Add our header
- */
+ /* Add our header */
- igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
+ igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
igmp->type =
msg->im_msgtype = assert;
- igmp->code = 0;
- ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
+ igmp->code = 0;
+ ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
skb->transport_header = skb->network_header;
}
@@ -943,9 +942,8 @@ static int ipmr_cache_report(struct mr_table *mrt,
return -EINVAL;
}
- /*
- * Deliver to mrouted
- */
+ /* Deliver to mrouted */
+
ret = sock_queue_rcv_skb(mroute_sk, skb);
rcu_read_unlock();
if (ret < 0) {
@@ -979,9 +977,7 @@ ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
}
if (!found) {
- /*
- * Create a new entry if allowable
- */
+ /* Create a new entry if allowable */
if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
(c = ipmr_cache_alloc_unres()) == NULL) {
@@ -991,16 +987,14 @@ ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
return -ENOBUFS;
}
- /*
- * Fill in the new cache entry
- */
+ /* Fill in the new cache entry */
+
c->mfc_parent = -1;
c->mfc_origin = iph->saddr;
c->mfc_mcastgrp = iph->daddr;
- /*
- * Reflect first query at mrouted.
- */
+ /* Reflect first query at mrouted. */
+
err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
if (err < 0) {
/* If the report failed throw the cache entry
@@ -1020,10 +1014,9 @@ ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
}
- /*
- * See if we can append the packet
- */
- if (c->mfc_un.unres.unresolved.qlen>3) {
+ /* See if we can append the packet */
+
+ if (c->mfc_un.unres.unresolved.qlen > 3) {
kfree_skb(skb);
err = -ENOBUFS;
} else {
@@ -1140,18 +1133,16 @@ static void mroute_clean_tables(struct mr_table *mrt)
LIST_HEAD(list);
struct mfc_cache *c, *next;
- /*
- * Shut down all active vif entries
- */
+ /* Shut down all active vif entries */
+
for (i = 0; i < mrt->maxvif; i++) {
- if (!(mrt->vif_table[i].flags&VIFF_STATIC))
+ if (!(mrt->vif_table[i].flags & VIFF_STATIC))
vif_delete(mrt, i, 0, &list);
}
unregister_netdevice_many(&list);
- /*
- * Wipe the cache
- */
+ /* Wipe the cache */
+
for (i = 0; i < MFC_LINES; i++) {
list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) {
if (c->mfc_flags & MFC_STATIC)
@@ -1282,7 +1273,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi
case MRT_ASSERT:
{
int v;
- if (get_user(v,(int __user *)optval))
+ if (get_user(v, (int __user *)optval))
return -EFAULT;
mrt->mroute_do_assert = (v) ? 1 : 0;
return 0;
@@ -1292,7 +1283,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi
{
int v;
- if (get_user(v,(int __user *)optval))
+ if (get_user(v, (int __user *)optval))
return -EFAULT;
v = (v) ? 1 : 0;
@@ -1355,9 +1346,9 @@ int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int
if (optname != MRT_VERSION &&
#ifdef CONFIG_IP_PIMSM
- optname!=MRT_PIM &&
+ optname != MRT_PIM &&
#endif
- optname!=MRT_ASSERT)
+ optname != MRT_ASSERT)
return -ENOPROTOOPT;
if (get_user(olr, optlen))
@@ -1473,7 +1464,7 @@ static struct notifier_block ip_mr_notifier = {
};
/*
- * Encapsulate a packet by attaching a valid IPIP header to it.
+ * Encapsulate a packet by attaching a valid IPIP header to it.
* This avoids tunnel drivers and other mess and gives us the speed so
* important for multicast video.
*/
@@ -1488,7 +1479,7 @@ static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr)
skb_reset_network_header(skb);
iph = ip_hdr(skb);
- iph->version = 4;
+ iph->version = 4;
iph->tos = old_iph->tos;
iph->ttl = old_iph->ttl;
iph->frag_off = 0;
@@ -1506,7 +1497,7 @@ static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr)
static inline int ipmr_forward_finish(struct sk_buff *skb)
{
- struct ip_options * opt = &(IPCB(skb)->opt);
+ struct ip_options *opt = &(IPCB(skb)->opt);
IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS);
@@ -1543,22 +1534,34 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
}
#endif
- if (vif->flags&VIFF_TUNNEL) {
- struct flowi fl = { .oif = vif->link,
- .nl_u = { .ip4_u =
- { .daddr = vif->remote,
- .saddr = vif->local,
- .tos = RT_TOS(iph->tos) } },
- .proto = IPPROTO_IPIP };
+ if (vif->flags & VIFF_TUNNEL) {
+ struct flowi fl = {
+ .oif = vif->link,
+ .nl_u = {
+ .ip4_u = {
+ .daddr = vif->remote,
+ .saddr = vif->local,
+ .tos = RT_TOS(iph->tos)
+ }
+ },
+ .proto = IPPROTO_IPIP
+ };
+
if (ip_route_output_key(net, &rt, &fl))
goto out_free;
encap = sizeof(struct iphdr);
} else {
- struct flowi fl = { .oif = vif->link,
- .nl_u = { .ip4_u =
- { .daddr = iph->daddr,
- .tos = RT_TOS(iph->tos) } },
- .proto = IPPROTO_IPIP };
+ struct flowi fl = {
+ .oif = vif->link,
+ .nl_u = {
+ .ip4_u = {
+ .daddr = iph->daddr,
+ .tos = RT_TOS(iph->tos)
+ }
+ },
+ .proto = IPPROTO_IPIP
+ };
+
if (ip_route_output_key(net, &rt, &fl))
goto out_free;
}
@@ -1567,8 +1570,8 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
/* Do not fragment multicasts. Alas, IPv4 does not
- allow to send ICMP, so that packets will disappear
- to blackhole.
+ * allow to send ICMP, so that packets will disappear
+ * to blackhole.
*/
IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
@@ -1591,7 +1594,8 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
ip_decrease_ttl(ip_hdr(skb));
/* FIXME: forward and output firewalls used to be called here.
- * What do we do with netfilter? -- RR */
+ * What do we do with netfilter? -- RR
+ */
if (vif->flags & VIFF_TUNNEL) {
ip_encap(skb, vif->local, vif->remote);
/* FIXME: extra output firewall step used to be here. --RR */
@@ -1652,15 +1656,15 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
if (skb_rtable(skb)->fl.iif == 0) {
/* It is our own packet, looped back.
- Very complicated situation...
-
- The best workaround until routing daemons will be
- fixed is not to redistribute packet, if it was
- send through wrong interface. It means, that
- multicast applications WILL NOT work for
- (S,G), which have default multicast route pointing
- to wrong oif. In any case, it is not a good
- idea to use multicasting applications on router.
+ * Very complicated situation...
+ *
+ * The best workaround until routing daemons will be
+ * fixed is not to redistribute packet, if it was
+ * send through wrong interface. It means, that
+ * multicast applications WILL NOT work for
+ * (S,G), which have default multicast route pointing
+ * to wrong oif. In any case, it is not a good
+ * idea to use multicasting applications on router.
*/
goto dont_forward;
}
@@ -1670,9 +1674,9 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
if (true_vifi >= 0 && mrt->mroute_do_assert &&
/* pimsm uses asserts, when switching from RPT to SPT,
- so that we cannot check that packet arrived on an oif.
- It is bad, but otherwise we would need to move pretty
- large chunk of pimd to kernel. Ough... --ANK
+ * so that we cannot check that packet arrived on an oif.
+ * It is bad, but otherwise we would need to move pretty
+ * large chunk of pimd to kernel. Ough... --ANK
*/
(mrt->mroute_do_pim ||
cache->mfc_un.res.ttls[true_vifi] < 255) &&
@@ -1690,10 +1694,12 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
/*
* Forward the frame
*/
- for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) {
+ for (ct = cache->mfc_un.res.maxvif - 1;
+ ct >= cache->mfc_un.res.minvif; ct--) {
if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
if (psend != -1) {
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+
if (skb2)
ipmr_queue_xmit(net, mrt, skb2, cache,
psend);
@@ -1704,6 +1710,7 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
if (psend != -1) {
if (local) {
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+
if (skb2)
ipmr_queue_xmit(net, mrt, skb2, cache, psend);
} else {
@@ -1733,7 +1740,7 @@ int ip_mr_input(struct sk_buff *skb)
int err;
/* Packet is looped back after forward, it should not be
- forwarded second time, but still can be delivered locally.
+ * forwarded second time, but still can be delivered locally.
*/
if (IPCB(skb)->flags & IPSKB_FORWARDED)
goto dont_forward;
@@ -1822,10 +1829,10 @@ static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
/*
- Check that:
- a. packet is really destinted to a multicast group
- b. packet is not a NULL-REGISTER
- c. packet is not truncated
+ * Check that:
+ * a. packet is really sent to a multicast group
+ * b. packet is not a NULL-REGISTER
+ * c. packet is not truncated
*/
if (!ipv4_is_multicast(encap->daddr) ||
encap->tot_len == 0 ||
@@ -1860,7 +1867,7 @@ static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
* Handle IGMP messages of PIMv1
*/
-int pim_rcv_v1(struct sk_buff * skb)
+int pim_rcv_v1(struct sk_buff *skb)
{
struct igmphdr *pim;
struct net *net = dev_net(skb->dev);
@@ -1887,7 +1894,7 @@ drop:
#endif
#ifdef CONFIG_IP_PIMSM_V2
-static int pim_rcv(struct sk_buff * skb)
+static int pim_rcv(struct sk_buff *skb)
{
struct pimreghdr *pim;
struct net *net = dev_net(skb->dev);
@@ -1897,8 +1904,8 @@ static int pim_rcv(struct sk_buff * skb)
goto drop;
pim = (struct pimreghdr *)skb_transport_header(skb);
- if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) ||
- (pim->flags&PIM_NULL_REGISTER) ||
+ if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) ||
+ (pim->flags & PIM_NULL_REGISTER) ||
(ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
csum_fold(skb_checksum(skb, 0, skb->len, 0))))
goto drop;
@@ -1971,7 +1978,7 @@ int ipmr_get_route(struct net *net,
struct sk_buff *skb2;
struct iphdr *iph;
struct net_device *dev;
- int vif;
+ int vif = -1;
if (nowait) {
rcu_read_unlock();
@@ -1980,7 +1987,9 @@ int ipmr_get_route(struct net *net,
dev = skb->dev;
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;
@@ -2294,7 +2304,7 @@ static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
if (!list_empty(it->cache))
return list_first_entry(it->cache, struct mfc_cache, list);
- end_of_list:
+end_of_list:
spin_unlock_bh(&mfc_unres_lock);
it->cache = NULL;
@@ -2335,7 +2345,7 @@ static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
mfc->mfc_un.res.bytes,
mfc->mfc_un.res.wrong_if);
for (n = mfc->mfc_un.res.minvif;
- n < mfc->mfc_un.res.maxvif; n++ ) {
+ n < mfc->mfc_un.res.maxvif; n++) {
if (VIF_EXISTS(mrt, n) &&
mfc->mfc_un.res.ttls[n] < 255)
seq_printf(seq,
--
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