* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
-
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/capability.h>
#include <linux/in.h>
#include <linux/skbuff.h>
#define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg)))
if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
- &ip6info->src), IP6T_INV_SRCIP)
- || FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
- &ip6info->dst), IP6T_INV_DSTIP)) {
+ &ip6info->src), IP6T_INV_SRCIP) ||
+ FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
+ &ip6info->dst), IP6T_INV_DSTIP)) {
dprintf("Source or dest mismatch.\n");
/*
dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr,
/* All zeroes == unconditional rule. */
/* Mildly perf critical (only if packet tracing is on) */
-static inline int
-unconditional(const struct ip6t_ip6 *ipv6)
+static inline bool unconditional(const struct ip6t_ip6 *ipv6)
{
- unsigned int i;
+ static const struct ip6t_ip6 uncond;
- for (i = 0; i < sizeof(*ipv6); i++)
- if (((char *)ipv6)[i])
- break;
-
- return (i == sizeof(*ipv6));
+ return memcmp(ipv6, &uncond, sizeof(uncond)) == 0;
}
#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
} else if (s == e) {
(*rulenum)++;
- if (s->target_offset == sizeof(struct ip6t_entry)
- && strcmp(t->target.u.kernel.target->name,
- IP6T_STANDARD_TARGET) == 0
- && t->verdict < 0
- && unconditional(&s->ipv6)) {
+ if (s->target_offset == sizeof(struct ip6t_entry) &&
+ strcmp(t->target.u.kernel.target->name,
+ IP6T_STANDARD_TARGET) == 0 &&
+ t->verdict < 0 &&
+ unconditional(&s->ipv6)) {
/* Tail of chains: STANDARD target (return/policy) */
*comment = *chainname == hookname
? comments[NF_IP6_TRACE_COMMENT_POLICY]
}
#endif
+static inline __pure struct ip6t_entry *
+ip6t_next_entry(const struct ip6t_entry *entry)
+{
+ return (void *)entry + entry->next_offset;
+}
+
/* Returns one of the generic firewall policies, like NF_ACCEPT. */
unsigned int
ip6t_do_table(struct sk_buff *skb,
const struct net_device *out,
struct xt_table *table)
{
+#define tb_comefrom ((struct ip6t_entry *)table_base)->comefrom
+
static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
bool hotdrop = false;
/* Initializing verdict to NF_DROP keeps gcc happy. */
mtpar.in = tgpar.in = in;
mtpar.out = tgpar.out = out;
mtpar.family = tgpar.family = NFPROTO_IPV6;
- tgpar.hooknum = hook;
+ mtpar.hooknum = tgpar.hooknum = hook;
IP_NF_ASSERT(table->valid_hooks & (1 << hook));
back = get_entry(table_base, private->underflow[hook]);
do {
+ struct ip6t_entry_target *t;
+
IP_NF_ASSERT(e);
IP_NF_ASSERT(back);
- if (ip6_packet_match(skb, indev, outdev, &e->ipv6,
- &mtpar.thoff, &mtpar.fragoff, &hotdrop)) {
- struct ip6t_entry_target *t;
-
- if (IP6T_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0)
- goto no_match;
+ if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
+ &mtpar.thoff, &mtpar.fragoff, &hotdrop) ||
+ IP6T_MATCH_ITERATE(e, do_match, skb, &mtpar) != 0) {
+ e = ip6t_next_entry(e);
+ continue;
+ }
- ADD_COUNTER(e->counters,
- ntohs(ipv6_hdr(skb)->payload_len) +
- sizeof(struct ipv6hdr), 1);
+ ADD_COUNTER(e->counters,
+ ntohs(ipv6_hdr(skb)->payload_len) +
+ sizeof(struct ipv6hdr), 1);
- t = ip6t_get_target(e);
- IP_NF_ASSERT(t->u.kernel.target);
+ t = ip6t_get_target(e);
+ IP_NF_ASSERT(t->u.kernel.target);
#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
- /* The packet is traced: log it */
- if (unlikely(skb->nf_trace))
- trace_packet(skb, hook, in, out,
- table->name, private, e);
+ /* The packet is traced: log it */
+ if (unlikely(skb->nf_trace))
+ trace_packet(skb, hook, in, out,
+ table->name, private, e);
#endif
- /* Standard target? */
- if (!t->u.kernel.target->target) {
- int v;
-
- v = ((struct ip6t_standard_target *)t)->verdict;
- if (v < 0) {
- /* Pop from stack? */
- if (v != IP6T_RETURN) {
- verdict = (unsigned)(-v) - 1;
- break;
- }
- e = back;
- back = get_entry(table_base,
- back->comefrom);
- continue;
- }
- if (table_base + v != (void *)e + e->next_offset
- && !(e->ipv6.flags & IP6T_F_GOTO)) {
- /* Save old back ptr in next entry */
- struct ip6t_entry *next
- = (void *)e + e->next_offset;
- next->comefrom
- = (void *)back - table_base;
- /* set back pointer to next entry */
- back = next;
+ /* Standard target? */
+ if (!t->u.kernel.target->target) {
+ int v;
+
+ v = ((struct ip6t_standard_target *)t)->verdict;
+ if (v < 0) {
+ /* Pop from stack? */
+ if (v != IP6T_RETURN) {
+ verdict = (unsigned)(-v) - 1;
+ break;
}
+ e = back;
+ back = get_entry(table_base, back->comefrom);
+ continue;
+ }
+ if (table_base + v != ip6t_next_entry(e) &&
+ !(e->ipv6.flags & IP6T_F_GOTO)) {
+ /* Save old back ptr in next entry */
+ struct ip6t_entry *next = ip6t_next_entry(e);
+ next->comefrom = (void *)back - table_base;
+ /* set back pointer to next entry */
+ back = next;
+ }
- e = get_entry(table_base, v);
- } else {
- /* Targets which reenter must return
- abs. verdicts */
- tgpar.target = t->u.kernel.target;
- tgpar.targinfo = t->data;
+ e = get_entry(table_base, v);
+ continue;
+ }
-#ifdef CONFIG_NETFILTER_DEBUG
- ((struct ip6t_entry *)table_base)->comefrom
- = 0xeeeeeeec;
-#endif
- verdict = t->u.kernel.target->target(skb,
- &tgpar);
+ /* Targets which reenter must return
+ abs. verdicts */
+ tgpar.target = t->u.kernel.target;
+ tgpar.targinfo = t->data;
#ifdef CONFIG_NETFILTER_DEBUG
- if (((struct ip6t_entry *)table_base)->comefrom
- != 0xeeeeeeec
- && verdict == IP6T_CONTINUE) {
- printk("Target %s reentered!\n",
- t->u.kernel.target->name);
- verdict = NF_DROP;
- }
- ((struct ip6t_entry *)table_base)->comefrom
- = 0x57acc001;
+ tb_comefrom = 0xeeeeeeec;
#endif
- if (verdict == IP6T_CONTINUE)
- e = (void *)e + e->next_offset;
- else
- /* Verdict */
- break;
- }
- } else {
+ verdict = t->u.kernel.target->target(skb, &tgpar);
- no_match:
- e = (void *)e + e->next_offset;
+#ifdef CONFIG_NETFILTER_DEBUG
+ if (tb_comefrom != 0xeeeeeeec && verdict == IP6T_CONTINUE) {
+ printk("Target %s reentered!\n",
+ t->u.kernel.target->name);
+ verdict = NF_DROP;
}
+ tb_comefrom = 0x57acc001;
+#endif
+ if (verdict == IP6T_CONTINUE)
+ e = ip6t_next_entry(e);
+ else
+ /* Verdict */
+ break;
} while (!hotdrop);
#ifdef CONFIG_NETFILTER_DEBUG
- ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON;
+ tb_comefrom = NETFILTER_LINK_POISON;
#endif
xt_info_rdunlock_bh();
return NF_DROP;
else return verdict;
#endif
+
+#undef tb_comefrom
}
/* Figures out from what hook each rule can be called: returns 0 if
e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
/* Unconditional return/END. */
- if ((e->target_offset == sizeof(struct ip6t_entry)
- && (strcmp(t->target.u.user.name,
- IP6T_STANDARD_TARGET) == 0)
- && t->verdict < 0
- && unconditional(&e->ipv6)) || visited) {
+ if ((e->target_offset == sizeof(struct ip6t_entry) &&
+ (strcmp(t->target.u.user.name,
+ IP6T_STANDARD_TARGET) == 0) &&
+ t->verdict < 0 &&
+ unconditional(&e->ipv6)) || visited) {
unsigned int oldpos, size;
if ((strcmp(t->target.u.user.name,
int newpos = t->verdict;
if (strcmp(t->target.u.user.name,
- IP6T_STANDARD_TARGET) == 0
- && newpos >= 0) {
+ IP6T_STANDARD_TARGET) == 0 &&
+ newpos >= 0) {
if (newpos > newinfo->size -
sizeof(struct ip6t_entry)) {
duprintf("mark_source_chains: "
}
static int
-cleanup_match(struct ip6t_entry_match *m, unsigned int *i)
+cleanup_match(struct ip6t_entry_match *m, struct net *net, unsigned int *i)
{
struct xt_mtdtor_param par;
if (i && (*i)-- == 0)
return 1;
+ par.net = net;
par.match = m->u.kernel.match;
par.matchinfo = m->data;
par.family = NFPROTO_IPV6;
return ret;
}
-static int check_target(struct ip6t_entry *e, const char *name)
+static int check_target(struct ip6t_entry *e, struct net *net, const char *name)
{
struct ip6t_entry_target *t = ip6t_get_target(e);
struct xt_tgchk_param par = {
+ .net = net,
.table = name,
.entryinfo = e,
.target = t->u.kernel.target,
}
static int
-find_check_entry(struct ip6t_entry *e, const char *name, unsigned int size,
- unsigned int *i)
+find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
+ unsigned int size, unsigned int *i)
{
struct ip6t_entry_target *t;
struct xt_target *target;
return ret;
j = 0;
+ mtpar.net = net;
mtpar.table = name;
mtpar.entryinfo = &e->ipv6;
mtpar.hook_mask = e->comefrom;
}
t->u.kernel.target = target;
- ret = check_target(e, name);
+ ret = check_target(e, net, name);
if (ret)
goto err;
err:
module_put(t->u.kernel.target->me);
cleanup_matches:
- IP6T_MATCH_ITERATE(e, cleanup_match, &j);
+ IP6T_MATCH_ITERATE(e, cleanup_match, net, &j);
return ret;
}
+static bool check_underflow(struct ip6t_entry *e)
+{
+ const struct ip6t_entry_target *t;
+ unsigned int verdict;
+
+ if (!unconditional(&e->ipv6))
+ return false;
+ t = ip6t_get_target(e);
+ if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
+ return false;
+ verdict = ((struct ip6t_standard_target *)t)->verdict;
+ verdict = -verdict - 1;
+ return verdict == NF_DROP || verdict == NF_ACCEPT;
+}
+
static int
check_entry_size_and_hooks(struct ip6t_entry *e,
struct xt_table_info *newinfo,
unsigned char *limit,
const unsigned int *hook_entries,
const unsigned int *underflows,
+ unsigned int valid_hooks,
unsigned int *i)
{
unsigned int h;
- if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0
- || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) {
+ if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
+ (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) {
duprintf("Bad offset %p\n", e);
return -EINVAL;
}
/* Check hooks & underflows */
for (h = 0; h < NF_INET_NUMHOOKS; h++) {
+ if (!(valid_hooks & (1 << h)))
+ continue;
if ((unsigned char *)e - base == hook_entries[h])
newinfo->hook_entry[h] = hook_entries[h];
- if ((unsigned char *)e - base == underflows[h])
+ if ((unsigned char *)e - base == underflows[h]) {
+ if (!check_underflow(e)) {
+ pr_err("Underflows must be unconditional and "
+ "use the STANDARD target with "
+ "ACCEPT/DROP\n");
+ return -EINVAL;
+ }
newinfo->underflow[h] = underflows[h];
+ }
}
- /* FIXME: underflows must be unconditional, standard verdicts
- < 0 (not IP6T_RETURN). --RR */
-
/* Clear counters and comefrom */
e->counters = ((struct xt_counters) { 0, 0 });
e->comefrom = 0;
}
static int
-cleanup_entry(struct ip6t_entry *e, unsigned int *i)
+cleanup_entry(struct ip6t_entry *e, struct net *net, unsigned int *i)
{
struct xt_tgdtor_param par;
struct ip6t_entry_target *t;
return 1;
/* Cleanup all matches */
- IP6T_MATCH_ITERATE(e, cleanup_match, NULL);
+ IP6T_MATCH_ITERATE(e, cleanup_match, net, NULL);
t = ip6t_get_target(e);
+ par.net = net;
par.target = t->u.kernel.target;
par.targinfo = t->data;
par.family = NFPROTO_IPV6;
/* Checks and translates the user-supplied table segment (held in
newinfo) */
static int
-translate_table(const char *name,
+translate_table(struct net *net,
+ const char *name,
unsigned int valid_hooks,
struct xt_table_info *newinfo,
void *entry0,
newinfo,
entry0,
entry0 + size,
- hook_entries, underflows, &i);
+ hook_entries, underflows, valid_hooks, &i);
if (ret != 0)
return ret;
/* Finally, each sanity check must pass */
i = 0;
ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size,
- find_check_entry, name, size, &i);
+ find_check_entry, net, name, size, &i);
if (ret != 0) {
IP6T_ENTRY_ITERATE(entry0, newinfo->size,
- cleanup_entry, &i);
+ cleanup_entry, net, &i);
return ret;
}
if (t && !IS_ERR(t)) {
struct ip6t_getinfo info;
const struct xt_table_info *private = t->private;
-
#ifdef CONFIG_COMPAT
+ struct xt_table_info tmp;
+
if (compat) {
- struct xt_table_info tmp;
ret = compat_table_info(private, &tmp);
xt_compat_flush_offsets(AF_INET6);
private = &tmp;
/* Decrease module usage counts and free resource */
loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,
- NULL);
+ net, NULL);
xt_free_table_info(oldinfo);
if (copy_to_user(counters_ptr, counters,
sizeof(struct xt_counters) * num_counters) != 0)
goto free_newinfo;
}
- ret = translate_table(tmp.name, tmp.valid_hooks,
+ ret = translate_table(net, tmp.name, tmp.valid_hooks,
newinfo, loc_cpu_entry, tmp.size, tmp.num_entries,
tmp.hook_entry, tmp.underflow);
if (ret != 0)
return 0;
free_newinfo_untrans:
- IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL);
+ IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, net, NULL);
free_newinfo:
xt_free_table_info(newinfo);
return ret;
int ret, off, h;
duprintf("check_compat_entry_size_and_hooks %p\n", e);
- if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0
- || (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) {
+ if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
+ (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) {
duprintf("Bad offset %p, limit = %p\n", e, limit);
return -EINVAL;
}
return ret;
}
-static int compat_check_entry(struct ip6t_entry *e, const char *name,
- unsigned int *i)
+static int compat_check_entry(struct ip6t_entry *e, struct net *net,
+ const char *name, unsigned int *i)
{
unsigned int j;
int ret;
struct xt_mtchk_param mtpar;
j = 0;
+ mtpar.net = net;
mtpar.table = name;
mtpar.entryinfo = &e->ipv6;
mtpar.hook_mask = e->comefrom;
if (ret)
goto cleanup_matches;
- ret = check_target(e, name);
+ ret = check_target(e, net, name);
if (ret)
goto cleanup_matches;
return 0;
cleanup_matches:
- IP6T_MATCH_ITERATE(e, cleanup_match, &j);
+ IP6T_MATCH_ITERATE(e, cleanup_match, net, &j);
return ret;
}
static int
-translate_compat_table(const char *name,
+translate_compat_table(struct net *net,
+ const char *name,
unsigned int valid_hooks,
struct xt_table_info **pinfo,
void **pentry0,
i = 0;
ret = IP6T_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry,
- name, &i);
+ net, name, &i);
if (ret) {
j -= i;
COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i,
compat_release_entry, &j);
- IP6T_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i);
+ IP6T_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, net, &i);
xt_free_table_info(newinfo);
return ret;
}
goto free_newinfo;
}
- ret = translate_compat_table(tmp.name, tmp.valid_hooks,
+ ret = translate_compat_table(net, tmp.name, tmp.valid_hooks,
&newinfo, &loc_cpu_entry, tmp.size,
tmp.num_entries, tmp.hook_entry,
tmp.underflow);
return 0;
free_newinfo_untrans:
- IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL);
+ IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, net, NULL);
free_newinfo:
xt_free_table_info(newinfo);
return ret;
return ret;
}
-struct xt_table *ip6t_register_table(struct net *net, struct xt_table *table,
+struct xt_table *ip6t_register_table(struct net *net,
+ const struct xt_table *table,
const struct ip6t_replace *repl)
{
int ret;
loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
memcpy(loc_cpu_entry, repl->entries, repl->size);
- ret = translate_table(table->name, table->valid_hooks,
+ ret = translate_table(net, table->name, table->valid_hooks,
newinfo, loc_cpu_entry, repl->size,
repl->num_entries,
repl->hook_entry,
return ERR_PTR(ret);
}
-void ip6t_unregister_table(struct xt_table *table)
+void ip6t_unregister_table(struct net *net, struct xt_table *table)
{
struct xt_table_info *private;
void *loc_cpu_entry;
/* Decrease module usage counts and free resources */
loc_cpu_entry = private->entries[raw_smp_processor_id()];
- IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL);
+ IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, net, NULL);
if (private->number > private->initial_entries)
module_put(table_owner);
xt_free_table_info(private);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff