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netfilter: Introduce NFPROTO_* constants
The netfilter subsystem only supports a handful of protocols (much less than PF_*) and even non-PF protocols like ARP and pseudo-protocols like PF_BRIDGE. By creating NFPROTO_*, we can earn a few memory savings on arrays that previously were always PF_MAX-sized and keep the pseudo-protocols to ourselves. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
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079aa88fe7
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7e9c6eeb13
@ -52,6 +52,16 @@ enum nf_inet_hooks {
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NF_INET_NUMHOOKS
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};
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enum {
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NFPROTO_UNSPEC = 0,
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NFPROTO_IPV4 = 2,
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NFPROTO_ARP = 3,
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NFPROTO_BRIDGE = 7,
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NFPROTO_IPV6 = 10,
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NFPROTO_DECNET = 12,
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NFPROTO_NUMPROTO,
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};
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union nf_inet_addr {
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__u32 all[4];
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__be32 ip;
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@ -138,7 +148,7 @@ extern struct ctl_path nf_net_netfilter_sysctl_path[];
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extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[];
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#endif /* CONFIG_SYSCTL */
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extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
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extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
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int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
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struct net_device *indev, struct net_device *outdev,
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@ -247,7 +257,7 @@ struct nf_afinfo {
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int route_key_size;
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};
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extern const struct nf_afinfo *nf_afinfo[NPROTO];
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extern const struct nf_afinfo *nf_afinfo[NFPROTO_NUMPROTO];
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static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
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{
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return rcu_dereference(nf_afinfo[family]);
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@ -26,7 +26,7 @@
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static DEFINE_MUTEX(afinfo_mutex);
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const struct nf_afinfo *nf_afinfo[NPROTO] __read_mostly;
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const struct nf_afinfo *nf_afinfo[NFPROTO_NUMPROTO] __read_mostly;
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EXPORT_SYMBOL(nf_afinfo);
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int nf_register_afinfo(const struct nf_afinfo *afinfo)
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@ -51,7 +51,7 @@ void nf_unregister_afinfo(const struct nf_afinfo *afinfo)
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}
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EXPORT_SYMBOL_GPL(nf_unregister_afinfo);
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struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS] __read_mostly;
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struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS] __read_mostly;
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EXPORT_SYMBOL(nf_hooks);
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static DEFINE_MUTEX(nf_hook_mutex);
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@ -264,7 +264,7 @@ EXPORT_SYMBOL(proc_net_netfilter);
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void __init netfilter_init(void)
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{
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int i, h;
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for (i = 0; i < NPROTO; i++) {
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for (i = 0; i < ARRAY_SIZE(nf_hooks); i++) {
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for (h = 0; h < NF_MAX_HOOKS; h++)
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INIT_LIST_HEAD(&nf_hooks[i][h]);
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}
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@ -15,7 +15,7 @@
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#define NF_LOG_PREFIXLEN 128
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static const struct nf_logger *nf_loggers[NPROTO] __read_mostly;
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static const struct nf_logger *nf_loggers[NFPROTO_NUMPROTO] __read_mostly;
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static DEFINE_MUTEX(nf_log_mutex);
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/* return EBUSY if somebody else is registered, EEXIST if the same logger
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@ -24,7 +24,7 @@ int nf_log_register(u_int8_t pf, const struct nf_logger *logger)
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{
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int ret;
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if (pf >= NPROTO)
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if (pf >= ARRAY_SIZE(nf_loggers))
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return -EINVAL;
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/* Any setup of logging members must be done before
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@ -47,7 +47,7 @@ EXPORT_SYMBOL(nf_log_register);
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void nf_log_unregister_pf(u_int8_t pf)
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{
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if (pf >= NPROTO)
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if (pf >= ARRAY_SIZE(nf_loggers))
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return;
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mutex_lock(&nf_log_mutex);
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rcu_assign_pointer(nf_loggers[pf], NULL);
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@ -63,7 +63,7 @@ void nf_log_unregister(const struct nf_logger *logger)
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int i;
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mutex_lock(&nf_log_mutex);
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for (i = 0; i < NPROTO; i++) {
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for (i = 0; i < ARRAY_SIZE(nf_loggers); i++) {
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if (nf_loggers[i] == logger)
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rcu_assign_pointer(nf_loggers[i], NULL);
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}
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@ -103,7 +103,7 @@ static void *seq_start(struct seq_file *seq, loff_t *pos)
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{
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rcu_read_lock();
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if (*pos >= NPROTO)
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if (*pos >= ARRAY_SIZE(nf_loggers))
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return NULL;
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return pos;
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@ -113,7 +113,7 @@ static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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(*pos)++;
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if (*pos >= NPROTO)
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if (*pos >= ARRAY_SIZE(nf_loggers))
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return NULL;
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return pos;
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@ -16,7 +16,7 @@
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* long term mutex. The handler must provide an an outfn() to accept packets
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* for queueing and must reinject all packets it receives, no matter what.
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*/
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static const struct nf_queue_handler *queue_handler[NPROTO];
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static const struct nf_queue_handler *queue_handler[NFPROTO_NUMPROTO] __read_mostly;
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static DEFINE_MUTEX(queue_handler_mutex);
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@ -26,7 +26,7 @@ int nf_register_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh)
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{
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int ret;
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if (pf >= NPROTO)
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if (pf >= ARRAY_SIZE(queue_handler))
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return -EINVAL;
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mutex_lock(&queue_handler_mutex);
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@ -47,7 +47,7 @@ EXPORT_SYMBOL(nf_register_queue_handler);
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/* The caller must flush their queue before this */
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int nf_unregister_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh)
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{
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if (pf >= NPROTO)
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if (pf >= ARRAY_SIZE(queue_handler))
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return -EINVAL;
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mutex_lock(&queue_handler_mutex);
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@ -70,7 +70,7 @@ void nf_unregister_queue_handlers(const struct nf_queue_handler *qh)
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u_int8_t pf;
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mutex_lock(&queue_handler_mutex);
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for (pf = 0; pf < NPROTO; pf++) {
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for (pf = 0; pf < ARRAY_SIZE(queue_handler); pf++) {
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if (queue_handler[pf] == qh)
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rcu_assign_pointer(queue_handler[pf], NULL);
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}
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@ -285,7 +285,7 @@ EXPORT_SYMBOL(nf_reinject);
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#ifdef CONFIG_PROC_FS
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static void *seq_start(struct seq_file *seq, loff_t *pos)
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{
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if (*pos >= NPROTO)
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if (*pos >= ARRAY_SIZE(queue_handler))
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return NULL;
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return pos;
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@ -295,7 +295,7 @@ static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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(*pos)++;
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if (*pos >= NPROTO)
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if (*pos >= ARRAY_SIZE(queue_handler))
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return NULL;
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return pos;
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@ -58,10 +58,12 @@ static struct xt_af *xt;
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#define duprintf(format, args...)
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#endif
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static const char *const xt_prefix[NPROTO] = {
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[AF_INET] = "ip",
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[AF_INET6] = "ip6",
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[NF_ARP] = "arp",
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static const char *const xt_prefix[NFPROTO_NUMPROTO] = {
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[NFPROTO_UNSPEC] = "x",
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[NFPROTO_IPV4] = "ip",
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[NFPROTO_ARP] = "arp",
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[NFPROTO_BRIDGE] = "eb",
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[NFPROTO_IPV6] = "ip6",
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};
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/* Registration hooks for targets. */
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@ -932,7 +934,7 @@ int xt_proto_init(struct net *net, u_int8_t af)
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struct proc_dir_entry *proc;
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#endif
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if (af >= NPROTO)
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if (af >= ARRAY_SIZE(xt_prefix))
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return -EINVAL;
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@ -1001,7 +1003,7 @@ static int __net_init xt_net_init(struct net *net)
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{
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int i;
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for (i = 0; i < NPROTO; i++)
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for (i = 0; i < NFPROTO_NUMPROTO; i++)
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INIT_LIST_HEAD(&net->xt.tables[i]);
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return 0;
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}
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@ -1014,11 +1016,11 @@ static int __init xt_init(void)
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{
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int i, rv;
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xt = kmalloc(sizeof(struct xt_af) * NPROTO, GFP_KERNEL);
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xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL);
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if (!xt)
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return -ENOMEM;
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for (i = 0; i < NPROTO; i++) {
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for (i = 0; i < NFPROTO_NUMPROTO; i++) {
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mutex_init(&xt[i].mutex);
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#ifdef CONFIG_COMPAT
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mutex_init(&xt[i].compat_mutex);
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