mirror of https://gitee.com/openkylin/linux.git
[NETFILTER]: Add "revision" support to arp_tables and ip6_tables
Like ip_tables already has it for some time, this adds support for having multiple revisions for each match/target. We steal one byte from the name in order to accomodate a 8 bit version number. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Harald Welte
Arnaldo Carvalho de Melo
parent
6ede2463c8
commit
6b7d31fcdd
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@ -68,7 +68,8 @@ struct arpt_entry_target
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u_int16_t target_size;
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/* Used by userspace */
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char name[ARPT_FUNCTION_MAXNAMELEN];
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char name[ARPT_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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} user;
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struct {
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u_int16_t target_size;
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@ -148,7 +149,9 @@ struct arpt_entry
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#define ARPT_SO_GET_INFO (ARPT_BASE_CTL)
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#define ARPT_SO_GET_ENTRIES (ARPT_BASE_CTL + 1)
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#define ARPT_SO_GET_MAX ARPT_SO_GET_ENTRIES
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/* #define ARPT_SO_GET_REVISION_MATCH (ARPT_BASE_CTL + 2)*/
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#define ARPT_SO_GET_REVISION_TARGET (ARPT_BASE_CTL + 3)
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#define ARPT_SO_GET_MAX ARPT_SO_GET_REVISION_TARGET
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/* CONTINUE verdict for targets */
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#define ARPT_CONTINUE 0xFFFFFFFF
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@ -236,6 +239,15 @@ struct arpt_get_entries
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struct arpt_entry entrytable[0];
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};
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/* The argument to ARPT_SO_GET_REVISION_*. Returns highest revision
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* kernel supports, if >= revision. */
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struct arpt_get_revision
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{
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char name[ARPT_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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};
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/* Standard return verdict, or do jump. */
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#define ARPT_STANDARD_TARGET ""
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/* Error verdict. */
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@ -274,7 +286,9 @@ struct arpt_target
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{
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struct list_head list;
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const char name[ARPT_FUNCTION_MAXNAMELEN];
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const char name[ARPT_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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/* Returns verdict. */
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unsigned int (*target)(struct sk_buff **pskb,
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@ -57,7 +57,8 @@ struct ip6t_entry_match
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u_int16_t match_size;
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/* Used by userspace */
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char name[IP6T_FUNCTION_MAXNAMELEN];
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char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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} user;
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struct {
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u_int16_t match_size;
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@ -80,7 +81,8 @@ struct ip6t_entry_target
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u_int16_t target_size;
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/* Used by userspace */
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char name[IP6T_FUNCTION_MAXNAMELEN];
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char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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} user;
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struct {
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u_int16_t target_size;
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@ -161,7 +163,9 @@ struct ip6t_entry
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#define IP6T_SO_GET_INFO (IP6T_BASE_CTL)
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#define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1)
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#define IP6T_SO_GET_MAX IP6T_SO_GET_ENTRIES
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#define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 2)
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#define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 3)
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#define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET
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/* CONTINUE verdict for targets */
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#define IP6T_CONTINUE 0xFFFFFFFF
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@ -291,6 +295,15 @@ struct ip6t_get_entries
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struct ip6t_entry entrytable[0];
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};
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/* The argument to IP6T_SO_GET_REVISION_*. Returns highest revision
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* kernel supports, if >= revision. */
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struct ip6t_get_revision
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{
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char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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};
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/* Standard return verdict, or do jump. */
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#define IP6T_STANDARD_TARGET ""
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/* Error verdict. */
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@ -352,7 +365,9 @@ struct ip6t_match
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{
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struct list_head list;
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const char name[IP6T_FUNCTION_MAXNAMELEN];
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const char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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/* Return true or false: return FALSE and set *hotdrop = 1 to
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force immediate packet drop. */
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@ -387,7 +402,9 @@ struct ip6t_target
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{
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struct list_head list;
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const char name[IP6T_FUNCTION_MAXNAMELEN];
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const char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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/* Returns verdict. Argument order changed since 2.6.9, as this
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must now handle non-linear skbs, using skb_copy_bits and
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@ -347,57 +347,105 @@ unsigned int arpt_do_table(struct sk_buff **pskb,
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return verdict;
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}
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static inline void *find_inlist_lock_noload(struct list_head *head,
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const char *name,
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int *error,
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struct semaphore *mutex)
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{
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void *ret;
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/*
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* These are weird, but module loading must not be done with mutex
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* held (since they will register), and we have to have a single
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* function to use try_then_request_module().
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*/
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*error = down_interruptible(mutex);
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if (*error != 0)
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/* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */
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static inline struct arpt_table *find_table_lock(const char *name)
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{
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struct arpt_table *t;
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if (down_interruptible(&arpt_mutex) != 0)
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return ERR_PTR(-EINTR);
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list_for_each_entry(t, &arpt_tables, list)
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if (strcmp(t->name, name) == 0 && try_module_get(t->me))
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return t;
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up(&arpt_mutex);
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return NULL;
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}
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/* Find target, grabs ref. Returns ERR_PTR() on error. */
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static inline struct arpt_target *find_target(const char *name, u8 revision)
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{
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struct arpt_target *t;
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int err = 0;
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if (down_interruptible(&arpt_mutex) != 0)
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return ERR_PTR(-EINTR);
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list_for_each_entry(t, &arpt_target, list) {
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if (strcmp(t->name, name) == 0) {
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if (t->revision == revision) {
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if (try_module_get(t->me)) {
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up(&arpt_mutex);
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return t;
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}
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} else
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err = -EPROTOTYPE; /* Found something. */
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}
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}
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up(&arpt_mutex);
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return ERR_PTR(err);
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}
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struct arpt_target *arpt_find_target(const char *name, u8 revision)
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{
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struct arpt_target *target;
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target = try_then_request_module(find_target(name, revision),
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"arpt_%s", name);
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if (IS_ERR(target) || !target)
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return NULL;
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ret = list_named_find(head, name);
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if (!ret) {
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*error = -ENOENT;
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up(mutex);
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}
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return ret;
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return target;
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}
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#ifndef CONFIG_KMOD
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#define find_inlist_lock(h,n,p,e,m) find_inlist_lock_noload((h),(n),(e),(m))
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#else
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static void *
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find_inlist_lock(struct list_head *head,
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const char *name,
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const char *prefix,
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int *error,
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struct semaphore *mutex)
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static int target_revfn(const char *name, u8 revision, int *bestp)
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{
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void *ret;
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struct arpt_target *t;
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int have_rev = 0;
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ret = find_inlist_lock_noload(head, name, error, mutex);
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if (!ret) {
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duprintf("find_inlist: loading `%s%s'.\n", prefix, name);
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request_module("%s%s", prefix, name);
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ret = find_inlist_lock_noload(head, name, error, mutex);
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list_for_each_entry(t, &arpt_target, list) {
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if (strcmp(t->name, name) == 0) {
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if (t->revision > *bestp)
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*bestp = t->revision;
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if (t->revision == revision)
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have_rev =1;
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}
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}
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return have_rev;
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}
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/* Returns true or false (if no such extension at all) */
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static inline int find_revision(const char *name, u8 revision,
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int (*revfn)(const char *, u8, int *),
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int *err)
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{
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int have_rev, best = -1;
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if (down_interruptible(&arpt_mutex) != 0) {
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*err = -EINTR;
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return 1;
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}
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have_rev = revfn(name, revision, &best);
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up(&arpt_mutex);
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/* Nothing at all? Return 0 to try loading module. */
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if (best == -1) {
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*err = -ENOENT;
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return 0;
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}
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return ret;
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}
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#endif
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static inline struct arpt_table *arpt_find_table_lock(const char *name, int *error, struct semaphore *mutex)
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{
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return find_inlist_lock(&arpt_tables, name, "arptable_", error, mutex);
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*err = best;
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if (!have_rev)
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*err = -EPROTONOSUPPORT;
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return 1;
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}
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static struct arpt_target *arpt_find_target_lock(const char *name, int *error, struct semaphore *mutex)
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{
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return find_inlist_lock(&arpt_target, name, "arpt_", error, mutex);
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}
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/* All zeroes == unconditional rule. */
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static inline int unconditional(const struct arpt_arp *arp)
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@ -544,17 +592,15 @@ static inline int check_entry(struct arpt_entry *e, const char *name, unsigned i
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}
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t = arpt_get_target(e);
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target = arpt_find_target_lock(t->u.user.name, &ret, &arpt_mutex);
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if (!target) {
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target = try_then_request_module(find_target(t->u.user.name,
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t->u.user.revision),
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"arpt_%s", t->u.user.name);
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if (IS_ERR(target) || !target) {
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duprintf("check_entry: `%s' not found\n", t->u.user.name);
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ret = target ? PTR_ERR(target) : -ENOENT;
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goto out;
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}
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if (!try_module_get((target->me))) {
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ret = -ENOENT;
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goto out_unlock;
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}
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t->u.kernel.target = target;
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up(&arpt_mutex);
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if (t->u.kernel.target == &arpt_standard_target) {
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if (!standard_check(t, size)) {
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@ -576,8 +622,6 @@ static inline int check_entry(struct arpt_entry *e, const char *name, unsigned i
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(*i)++;
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return 0;
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out_unlock:
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up(&arpt_mutex);
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out:
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return ret;
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}
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@ -846,8 +890,8 @@ static int get_entries(const struct arpt_get_entries *entries,
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int ret;
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struct arpt_table *t;
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t = arpt_find_table_lock(entries->name, &ret, &arpt_mutex);
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if (t) {
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t = find_table_lock(entries->name);
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if (t || !IS_ERR(t)) {
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duprintf("t->private->number = %u\n",
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t->private->number);
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if (entries->size == t->private->size)
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@ -859,10 +903,10 @@ static int get_entries(const struct arpt_get_entries *entries,
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entries->size);
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ret = -EINVAL;
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}
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module_put(t->me);
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up(&arpt_mutex);
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} else
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duprintf("get_entries: Can't find %s!\n",
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entries->name);
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ret = t ? PTR_ERR(t) : -ENOENT;
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return ret;
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}
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@ -913,22 +957,19 @@ static int do_replace(void __user *user, unsigned int len)
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duprintf("arp_tables: Translated table\n");
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t = arpt_find_table_lock(tmp.name, &ret, &arpt_mutex);
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if (!t)
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t = try_then_request_module(find_table_lock(tmp.name),
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"arptable_%s", tmp.name);
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if (!t || IS_ERR(t)) {
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ret = t ? PTR_ERR(t) : -ENOENT;
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goto free_newinfo_counters_untrans;
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}
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/* You lied! */
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if (tmp.valid_hooks != t->valid_hooks) {
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duprintf("Valid hook crap: %08X vs %08X\n",
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tmp.valid_hooks, t->valid_hooks);
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ret = -EINVAL;
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goto free_newinfo_counters_untrans_unlock;
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}
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/* Get a reference in advance, we're not allowed fail later */
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if (!try_module_get(t->me)) {
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ret = -EBUSY;
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goto free_newinfo_counters_untrans_unlock;
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goto put_module;
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}
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oldinfo = replace_table(t, tmp.num_counters, newinfo, &ret);
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@ -959,7 +1000,6 @@ static int do_replace(void __user *user, unsigned int len)
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put_module:
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module_put(t->me);
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free_newinfo_counters_untrans_unlock:
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up(&arpt_mutex);
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free_newinfo_counters_untrans:
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ARPT_ENTRY_ITERATE(newinfo->entries, newinfo->size, cleanup_entry, NULL);
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@ -989,7 +1029,7 @@ static int do_add_counters(void __user *user, unsigned int len)
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unsigned int i;
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struct arpt_counters_info tmp, *paddc;
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struct arpt_table *t;
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int ret;
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int ret = 0;
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if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
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return -EFAULT;
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@ -1006,9 +1046,11 @@ static int do_add_counters(void __user *user, unsigned int len)
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goto free;
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}
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t = arpt_find_table_lock(tmp.name, &ret, &arpt_mutex);
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if (!t)
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t = find_table_lock(tmp.name);
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if (!t || IS_ERR(t)) {
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ret = t ? PTR_ERR(t) : -ENOENT;
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goto free;
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}
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write_lock_bh(&t->lock);
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if (t->private->number != paddc->num_counters) {
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@ -1025,6 +1067,7 @@ static int do_add_counters(void __user *user, unsigned int len)
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unlock_up_free:
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write_unlock_bh(&t->lock);
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up(&arpt_mutex);
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module_put(t->me);
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free:
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vfree(paddc);
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@ -1079,8 +1122,10 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
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break;
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}
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name[ARPT_TABLE_MAXNAMELEN-1] = '\0';
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t = arpt_find_table_lock(name, &ret, &arpt_mutex);
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if (t) {
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t = try_then_request_module(find_table_lock(name),
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"arptable_%s", name);
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if (t && !IS_ERR(t)) {
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struct arpt_getinfo info;
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info.valid_hooks = t->valid_hooks;
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@ -1096,9 +1141,10 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
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ret = -EFAULT;
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else
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ret = 0;
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up(&arpt_mutex);
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}
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module_put(t->me);
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} else
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ret = t ? PTR_ERR(t) : -ENOENT;
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}
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break;
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@ -1119,6 +1165,24 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
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break;
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}
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case ARPT_SO_GET_REVISION_TARGET: {
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struct arpt_get_revision rev;
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if (*len != sizeof(rev)) {
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ret = -EINVAL;
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break;
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}
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if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
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ret = -EFAULT;
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break;
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}
|
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try_then_request_module(find_revision(rev.name, rev.revision,
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target_revfn, &ret),
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"arpt_%s", rev.name);
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break;
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}
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default:
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duprintf("do_arpt_get_ctl: unknown request %i\n", cmd);
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ret = -EINVAL;
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|
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@ -1136,12 +1200,9 @@ int arpt_register_target(struct arpt_target *target)
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if (ret != 0)
|
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return ret;
|
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|
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if (!list_named_insert(&arpt_target, target)) {
|
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duprintf("arpt_register_target: `%s' already in list!\n",
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target->name);
|
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ret = -EINVAL;
|
||||
}
|
||||
list_add(&target->list, &arpt_target);
|
||||
up(&arpt_mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
* Packet matching code.
|
||||
*
|
||||
* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
|
||||
* Copyright (C) 2000-2002 Netfilter core team <coreteam@netfilter.org>
|
||||
* Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
|
|
@ -23,7 +23,6 @@
|
|||
#include <linux/tcp.h>
|
||||
#include <linux/udp.h>
|
||||
#include <linux/icmpv6.h>
|
||||
#include <net/ip.h>
|
||||
#include <net/ipv6.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/semaphore.h>
|
||||
|
|
@ -80,13 +79,12 @@ static DECLARE_MUTEX(ip6t_mutex);
|
|||
#define inline
|
||||
#endif
|
||||
|
||||
/* Locking is simple: we assume at worst case there will be one packet
|
||||
in user context and one from bottom halves (or soft irq if Alexey's
|
||||
softnet patch was applied).
|
||||
|
||||
/*
|
||||
We keep a set of rules for each CPU, so we can avoid write-locking
|
||||
them; doing a readlock_bh() stops packets coming through if we're
|
||||
in user context.
|
||||
them in the softirq when updating the counters and therefore
|
||||
only need to read-lock in the softirq; doing a write_lock_bh() in user
|
||||
context stops packets coming through and allows user context to read
|
||||
the counters or update the rules.
|
||||
|
||||
To be cache friendly on SMP, we arrange them like so:
|
||||
[ n-entries ]
|
||||
|
|
@ -356,7 +354,7 @@ ip6t_do_table(struct sk_buff **pskb,
|
|||
struct ip6t_table *table,
|
||||
void *userdata)
|
||||
{
|
||||
static const char nulldevname[IFNAMSIZ];
|
||||
static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
|
||||
int offset = 0;
|
||||
unsigned int protoff = 0;
|
||||
int hotdrop = 0;
|
||||
|
|
@ -369,7 +367,6 @@ ip6t_do_table(struct sk_buff **pskb,
|
|||
/* Initialization */
|
||||
indev = in ? in->name : nulldevname;
|
||||
outdev = out ? out->name : nulldevname;
|
||||
|
||||
/* We handle fragments by dealing with the first fragment as
|
||||
* if it was a normal packet. All other fragments are treated
|
||||
* normally, except that they will NEVER match rules that ask
|
||||
|
|
@ -497,74 +494,144 @@ ip6t_do_table(struct sk_buff **pskb,
|
|||
#endif
|
||||
}
|
||||
|
||||
/* If it succeeds, returns element and locks mutex */
|
||||
static inline void *
|
||||
find_inlist_lock_noload(struct list_head *head,
|
||||
const char *name,
|
||||
int *error,
|
||||
struct semaphore *mutex)
|
||||
/*
|
||||
* These are weird, but module loading must not be done with mutex
|
||||
* held (since they will register), and we have to have a single
|
||||
* function to use try_then_request_module().
|
||||
*/
|
||||
|
||||
/* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */
|
||||
static inline struct ip6t_table *find_table_lock(const char *name)
|
||||
{
|
||||
void *ret;
|
||||
struct ip6t_table *t;
|
||||
|
||||
#if 1
|
||||
duprintf("find_inlist: searching for `%s' in %s.\n",
|
||||
name, head == &ip6t_target ? "ip6t_target"
|
||||
: head == &ip6t_match ? "ip6t_match"
|
||||
: head == &ip6t_tables ? "ip6t_tables" : "UNKNOWN");
|
||||
#endif
|
||||
if (down_interruptible(&ip6t_mutex) != 0)
|
||||
return ERR_PTR(-EINTR);
|
||||
|
||||
*error = down_interruptible(mutex);
|
||||
if (*error != 0)
|
||||
list_for_each_entry(t, &ip6t_tables, list)
|
||||
if (strcmp(t->name, name) == 0 && try_module_get(t->me))
|
||||
return t;
|
||||
up(&ip6t_mutex);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Find match, grabs ref. Returns ERR_PTR() on error. */
|
||||
static inline struct ip6t_match *find_match(const char *name, u8 revision)
|
||||
{
|
||||
struct ip6t_match *m;
|
||||
int err = 0;
|
||||
|
||||
if (down_interruptible(&ip6t_mutex) != 0)
|
||||
return ERR_PTR(-EINTR);
|
||||
|
||||
list_for_each_entry(m, &ip6t_match, list) {
|
||||
if (strcmp(m->name, name) == 0) {
|
||||
if (m->revision == revision) {
|
||||
if (try_module_get(m->me)) {
|
||||
up(&ip6t_mutex);
|
||||
return m;
|
||||
}
|
||||
} else
|
||||
err = -EPROTOTYPE; /* Found something. */
|
||||
}
|
||||
}
|
||||
up(&ip6t_mutex);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
/* Find target, grabs ref. Returns ERR_PTR() on error. */
|
||||
static inline struct ip6t_target *find_target(const char *name, u8 revision)
|
||||
{
|
||||
struct ip6t_target *t;
|
||||
int err = 0;
|
||||
|
||||
if (down_interruptible(&ip6t_mutex) != 0)
|
||||
return ERR_PTR(-EINTR);
|
||||
|
||||
list_for_each_entry(t, &ip6t_target, list) {
|
||||
if (strcmp(t->name, name) == 0) {
|
||||
if (t->revision == revision) {
|
||||
if (try_module_get(t->me)) {
|
||||
up(&ip6t_mutex);
|
||||
return t;
|
||||
}
|
||||
} else
|
||||
err = -EPROTOTYPE; /* Found something. */
|
||||
}
|
||||
}
|
||||
up(&ip6t_mutex);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
struct ip6t_target *ip6t_find_target(const char *name, u8 revision)
|
||||
{
|
||||
struct ip6t_target *target;
|
||||
|
||||
target = try_then_request_module(find_target(name, revision),
|
||||
"ip6t_%s", name);
|
||||
if (IS_ERR(target) || !target)
|
||||
return NULL;
|
||||
|
||||
ret = list_named_find(head, name);
|
||||
if (!ret) {
|
||||
*error = -ENOENT;
|
||||
up(mutex);
|
||||
}
|
||||
return ret;
|
||||
return target;
|
||||
}
|
||||
|
||||
#ifndef CONFIG_KMOD
|
||||
#define find_inlist_lock(h,n,p,e,m) find_inlist_lock_noload((h),(n),(e),(m))
|
||||
#else
|
||||
static void *
|
||||
find_inlist_lock(struct list_head *head,
|
||||
const char *name,
|
||||
const char *prefix,
|
||||
int *error,
|
||||
struct semaphore *mutex)
|
||||
static int match_revfn(const char *name, u8 revision, int *bestp)
|
||||
{
|
||||
void *ret;
|
||||
struct ip6t_match *m;
|
||||
int have_rev = 0;
|
||||
|
||||
ret = find_inlist_lock_noload(head, name, error, mutex);
|
||||
if (!ret) {
|
||||
duprintf("find_inlist: loading `%s%s'.\n", prefix, name);
|
||||
request_module("%s%s", prefix, name);
|
||||
ret = find_inlist_lock_noload(head, name, error, mutex);
|
||||
list_for_each_entry(m, &ip6t_match, list) {
|
||||
if (strcmp(m->name, name) == 0) {
|
||||
if (m->revision > *bestp)
|
||||
*bestp = m->revision;
|
||||
if (m->revision == revision)
|
||||
have_rev = 1;
|
||||
}
|
||||
}
|
||||
return have_rev;
|
||||
}
|
||||
|
||||
static int target_revfn(const char *name, u8 revision, int *bestp)
|
||||
{
|
||||
struct ip6t_target *t;
|
||||
int have_rev = 0;
|
||||
|
||||
list_for_each_entry(t, &ip6t_target, list) {
|
||||
if (strcmp(t->name, name) == 0) {
|
||||
if (t->revision > *bestp)
|
||||
*bestp = t->revision;
|
||||
if (t->revision == revision)
|
||||
have_rev = 1;
|
||||
}
|
||||
}
|
||||
return have_rev;
|
||||
}
|
||||
|
||||
/* Returns true or fals (if no such extension at all) */
|
||||
static inline int find_revision(const char *name, u8 revision,
|
||||
int (*revfn)(const char *, u8, int *),
|
||||
int *err)
|
||||
{
|
||||
int have_rev, best = -1;
|
||||
|
||||
if (down_interruptible(&ip6t_mutex) != 0) {
|
||||
*err = -EINTR;
|
||||
return 1;
|
||||
}
|
||||
have_rev = revfn(name, revision, &best);
|
||||
up(&ip6t_mutex);
|
||||
|
||||
/* Nothing at all? Return 0 to try loading module. */
|
||||
if (best == -1) {
|
||||
*err = -ENOENT;
|
||||
return 0;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
static inline struct ip6t_table *
|
||||
ip6t_find_table_lock(const char *name, int *error, struct semaphore *mutex)
|
||||
{
|
||||
return find_inlist_lock(&ip6t_tables, name, "ip6table_", error, mutex);
|
||||
*err = best;
|
||||
if (!have_rev)
|
||||
*err = -EPROTONOSUPPORT;
|
||||
return 1;
|
||||
}
|
||||
|
||||
static inline struct ip6t_match *
|
||||
find_match_lock(const char *name, int *error, struct semaphore *mutex)
|
||||
{
|
||||
return find_inlist_lock(&ip6t_match, name, "ip6t_", error, mutex);
|
||||
}
|
||||
|
||||
static struct ip6t_target *
|
||||
ip6t_find_target_lock(const char *name, int *error, struct semaphore *mutex)
|
||||
{
|
||||
return find_inlist_lock(&ip6t_target, name, "ip6t_", error, mutex);
|
||||
}
|
||||
|
||||
/* All zeroes == unconditional rule. */
|
||||
static inline int
|
||||
|
|
@ -725,20 +792,16 @@ check_match(struct ip6t_entry_match *m,
|
|||
unsigned int hookmask,
|
||||
unsigned int *i)
|
||||
{
|
||||
int ret;
|
||||
struct ip6t_match *match;
|
||||
|
||||
match = find_match_lock(m->u.user.name, &ret, &ip6t_mutex);
|
||||
if (!match) {
|
||||
// duprintf("check_match: `%s' not found\n", m->u.name);
|
||||
return ret;
|
||||
}
|
||||
if (!try_module_get(match->me)) {
|
||||
up(&ip6t_mutex);
|
||||
return -ENOENT;
|
||||
match = try_then_request_module(find_match(m->u.user.name,
|
||||
m->u.user.revision),
|
||||
"ip6t_%s", m->u.user.name);
|
||||
if (IS_ERR(match) || !match) {
|
||||
duprintf("check_match: `%s' not found\n", m->u.user.name);
|
||||
return match ? PTR_ERR(match) : -ENOENT;
|
||||
}
|
||||
m->u.kernel.match = match;
|
||||
up(&ip6t_mutex);
|
||||
|
||||
if (m->u.kernel.match->checkentry
|
||||
&& !m->u.kernel.match->checkentry(name, ipv6, m->data,
|
||||
|
|
@ -776,22 +839,16 @@ check_entry(struct ip6t_entry *e, const char *name, unsigned int size,
|
|||
goto cleanup_matches;
|
||||
|
||||
t = ip6t_get_target(e);
|
||||
target = ip6t_find_target_lock(t->u.user.name, &ret, &ip6t_mutex);
|
||||
if (!target) {
|
||||
target = try_then_request_module(find_target(t->u.user.name,
|
||||
t->u.user.revision),
|
||||
"ip6t_%s", t->u.user.name);
|
||||
if (IS_ERR(target) || !target) {
|
||||
duprintf("check_entry: `%s' not found\n", t->u.user.name);
|
||||
goto cleanup_matches;
|
||||
}
|
||||
if (!try_module_get(target->me)) {
|
||||
up(&ip6t_mutex);
|
||||
ret = -ENOENT;
|
||||
ret = target ? PTR_ERR(target) : -ENOENT;
|
||||
goto cleanup_matches;
|
||||
}
|
||||
t->u.kernel.target = target;
|
||||
up(&ip6t_mutex);
|
||||
if (!t->u.kernel.target) {
|
||||
ret = -EBUSY;
|
||||
goto cleanup_matches;
|
||||
}
|
||||
|
||||
if (t->u.kernel.target == &ip6t_standard_target) {
|
||||
if (!standard_check(t, size)) {
|
||||
ret = -EINVAL;
|
||||
|
|
@ -1118,8 +1175,8 @@ get_entries(const struct ip6t_get_entries *entries,
|
|||
int ret;
|
||||
struct ip6t_table *t;
|
||||
|
||||
t = ip6t_find_table_lock(entries->name, &ret, &ip6t_mutex);
|
||||
if (t) {
|
||||
t = find_table_lock(entries->name);
|
||||
if (t && !IS_ERR(t)) {
|
||||
duprintf("t->private->number = %u\n",
|
||||
t->private->number);
|
||||
if (entries->size == t->private->size)
|
||||
|
|
@ -1131,10 +1188,10 @@ get_entries(const struct ip6t_get_entries *entries,
|
|||
entries->size);
|
||||
ret = -EINVAL;
|
||||
}
|
||||
module_put(t->me);
|
||||
up(&ip6t_mutex);
|
||||
} else
|
||||
duprintf("get_entries: Can't find %s!\n",
|
||||
entries->name);
|
||||
ret = t ? PTR_ERR(t) : -ENOENT;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -1182,22 +1239,19 @@ do_replace(void __user *user, unsigned int len)
|
|||
|
||||
duprintf("ip_tables: Translated table\n");
|
||||
|
||||
t = ip6t_find_table_lock(tmp.name, &ret, &ip6t_mutex);
|
||||
if (!t)
|
||||
t = try_then_request_module(find_table_lock(tmp.name),
|
||||
"ip6table_%s", tmp.name);
|
||||
if (!t || IS_ERR(t)) {
|
||||
ret = t ? PTR_ERR(t) : -ENOENT;
|
||||
goto free_newinfo_counters_untrans;
|
||||
}
|
||||
|
||||
/* You lied! */
|
||||
if (tmp.valid_hooks != t->valid_hooks) {
|
||||
duprintf("Valid hook crap: %08X vs %08X\n",
|
||||
tmp.valid_hooks, t->valid_hooks);
|
||||
ret = -EINVAL;
|
||||
goto free_newinfo_counters_untrans_unlock;
|
||||
}
|
||||
|
||||
/* Get a reference in advance, we're not allowed fail later */
|
||||
if (!try_module_get(t->me)) {
|
||||
ret = -EBUSY;
|
||||
goto free_newinfo_counters_untrans_unlock;
|
||||
goto put_module;
|
||||
}
|
||||
|
||||
oldinfo = replace_table(t, tmp.num_counters, newinfo, &ret);
|
||||
|
|
@ -1219,7 +1273,6 @@ do_replace(void __user *user, unsigned int len)
|
|||
/* Decrease module usage counts and free resource */
|
||||
IP6T_ENTRY_ITERATE(oldinfo->entries, oldinfo->size, cleanup_entry,NULL);
|
||||
vfree(oldinfo);
|
||||
/* Silent error: too late now. */
|
||||
if (copy_to_user(tmp.counters, counters,
|
||||
sizeof(struct ip6t_counters) * tmp.num_counters) != 0)
|
||||
ret = -EFAULT;
|
||||
|
|
@ -1229,7 +1282,6 @@ do_replace(void __user *user, unsigned int len)
|
|||
|
||||
put_module:
|
||||
module_put(t->me);
|
||||
free_newinfo_counters_untrans_unlock:
|
||||
up(&ip6t_mutex);
|
||||
free_newinfo_counters_untrans:
|
||||
IP6T_ENTRY_ITERATE(newinfo->entries, newinfo->size, cleanup_entry,NULL);
|
||||
|
|
@ -1268,7 +1320,7 @@ do_add_counters(void __user *user, unsigned int len)
|
|||
unsigned int i;
|
||||
struct ip6t_counters_info tmp, *paddc;
|
||||
struct ip6t_table *t;
|
||||
int ret;
|
||||
int ret = 0;
|
||||
|
||||
if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
|
||||
return -EFAULT;
|
||||
|
|
@ -1285,9 +1337,11 @@ do_add_counters(void __user *user, unsigned int len)
|
|||
goto free;
|
||||
}
|
||||
|
||||
t = ip6t_find_table_lock(tmp.name, &ret, &ip6t_mutex);
|
||||
if (!t)
|
||||
t = find_table_lock(tmp.name);
|
||||
if (!t || IS_ERR(t)) {
|
||||
ret = t ? PTR_ERR(t) : -ENOENT;
|
||||
goto free;
|
||||
}
|
||||
|
||||
write_lock_bh(&t->lock);
|
||||
if (t->private->number != paddc->num_counters) {
|
||||
|
|
@ -1304,6 +1358,7 @@ do_add_counters(void __user *user, unsigned int len)
|
|||
unlock_up_free:
|
||||
write_unlock_bh(&t->lock);
|
||||
up(&ip6t_mutex);
|
||||
module_put(t->me);
|
||||
free:
|
||||
vfree(paddc);
|
||||
|
||||
|
|
@ -1360,8 +1415,10 @@ do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
|
|||
break;
|
||||
}
|
||||
name[IP6T_TABLE_MAXNAMELEN-1] = '\0';
|
||||
t = ip6t_find_table_lock(name, &ret, &ip6t_mutex);
|
||||
if (t) {
|
||||
|
||||
t = try_then_request_module(find_table_lock(name),
|
||||
"ip6table_%s", name);
|
||||
if (t && !IS_ERR(t)) {
|
||||
struct ip6t_getinfo info;
|
||||
|
||||
info.valid_hooks = t->valid_hooks;
|
||||
|
|
@ -1377,9 +1434,10 @@ do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
|
|||
ret = -EFAULT;
|
||||
else
|
||||
ret = 0;
|
||||
|
||||
up(&ip6t_mutex);
|
||||
}
|
||||
module_put(t->me);
|
||||
} else
|
||||
ret = t ? PTR_ERR(t) : -ENOENT;
|
||||
}
|
||||
break;
|
||||
|
||||
|
|
@ -1400,6 +1458,31 @@ do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
|
|||
break;
|
||||
}
|
||||
|
||||
case IP6T_SO_GET_REVISION_MATCH:
|
||||
case IP6T_SO_GET_REVISION_TARGET: {
|
||||
struct ip6t_get_revision rev;
|
||||
int (*revfn)(const char *, u8, int *);
|
||||
|
||||
if (*len != sizeof(rev)) {
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
|
||||
ret = -EFAULT;
|
||||
break;
|
||||
}
|
||||
|
||||
if (cmd == IP6T_SO_GET_REVISION_TARGET)
|
||||
revfn = target_revfn;
|
||||
else
|
||||
revfn = match_revfn;
|
||||
|
||||
try_then_request_module(find_revision(rev.name, rev.revision,
|
||||
revfn, &ret),
|
||||
"ip6t_%s", rev.name);
|
||||
break;
|
||||
}
|
||||
|
||||
default:
|
||||
duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd);
|
||||
ret = -EINVAL;
|
||||
|
|
@ -1417,12 +1500,7 @@ ip6t_register_target(struct ip6t_target *target)
|
|||
ret = down_interruptible(&ip6t_mutex);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
if (!list_named_insert(&ip6t_target, target)) {
|
||||
duprintf("ip6t_register_target: `%s' already in list!\n",
|
||||
target->name);
|
||||
ret = -EINVAL;
|
||||
}
|
||||
list_add(&target->list, &ip6t_target);
|
||||
up(&ip6t_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -1444,11 +1522,7 @@ ip6t_register_match(struct ip6t_match *match)
|
|||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
if (!list_named_insert(&ip6t_match, match)) {
|
||||
duprintf("ip6t_register_match: `%s' already in list!\n",
|
||||
match->name);
|
||||
ret = -EINVAL;
|
||||
}
|
||||
list_add(&match->list, &ip6t_match);
|
||||
up(&ip6t_mutex);
|
||||
|
||||
return ret;
|
||||
|
|
|
|||
|
|
@ -56,8 +56,12 @@ checkentry(const char *tablename,
|
|||
return 1;
|
||||
}
|
||||
|
||||
static struct ip6t_target ip6t_mark_reg
|
||||
= { { NULL, NULL }, "MARK", target, checkentry, NULL, THIS_MODULE };
|
||||
static struct ip6t_target ip6t_mark_reg = {
|
||||
.name = "MARK",
|
||||
.target = target,
|
||||
.checkentry = checkentry,
|
||||
.me = THIS_MODULE
|
||||
};
|
||||
|
||||
static int __init init(void)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in New Issue