[netfilter-cvslog] [libnfnetlink] major cleanup of index2name infrastructure: use linux list (and fix leak in the nlif_close path)
Pablo Neira
netfilter-cvslog-bounces at lists.netfilter.org
Sun May 25 20:44:22 CEST 2008
Gitweb: http://git.netfilter.org/cgi-bin/gitweb.cgi?p=libnfnetlink.git;a=commit;h=36d2ed3de20a37a1d5a970596e3f672537c36f49
commit 36d2ed3de20a37a1d5a970596e3f672537c36f49
Author: Pablo Neira Ayuso <pablo at netfilter.org>
AuthorDate: Sun May 25 20:30:23 2008 +0200
Commit: Pablo Neira Ayuso <pablo at netfilter.org>
CommitDate: Sun May 25 20:30:23 2008 +0200
major cleanup of index2name infrastructure: use linux list (and fix leak in the nlif_close path)
via 36d2ed3de20a37a1d5a970596e3f672537c36f49 (commit)
from 78437ef8c86075d2621d954fdf77d255df798267 (commit)
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.
- Log -----------------------------------------------------------------
commit 36d2ed3de20a37a1d5a970596e3f672537c36f49
Author: Pablo Neira Ayuso <pablo at netfilter.org>
Date: Sun May 25 20:30:23 2008 +0200
major cleanup of index2name infrastructure: use linux list (and fix leak in the nlif_close path)
-----------------------------------------------------------------------
configure.in | 2 +-
include/Makefile.am | 3 +-
include/linux_list.h | 727 ++++++++++++++++++++++++++++++++++++++++++++++++++
src/iftable.c | 178 ++++++-------
src/rtnl.c | 3 +-
5 files changed, 816 insertions(+), 97 deletions(-)
create mode 100644 include/linux_list.h
diff --git a/configure.in b/configure.in
index 84772b4..d8270f6 100644
--- a/configure.in
+++ b/configure.in
@@ -1,6 +1,6 @@
dnl Process this file with autoconf to create configure.
-AC_INIT(libnfnetlink, 0.0.35)
+AC_INIT(libnfnetlink, 0.0.37)
AC_CANONICAL_SYSTEM
diff --git a/include/Makefile.am b/include/Makefile.am
index 16b7c90..288c711 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -1,3 +1,2 @@
-
SUBDIRS = libnfnetlink
-
+noinst_HEADERS = linux_list.h
diff --git a/include/linux_list.h b/include/linux_list.h
new file mode 100644
index 0000000..de182a4
--- /dev/null
+++ b/include/linux_list.h
@@ -0,0 +1,727 @@
+#ifndef _LINUX_LIST_H
+#define _LINUX_LIST_H
+
+#include <stddef.h>
+
+#undef offsetof
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+
+/**
+ * container_of - cast a member of a structure out to the containing structure
+ *
+ * @ptr: the pointer to the member.
+ * @type: the type of the container struct this is embedded in.
+ * @member: the name of the member within the struct.
+ *
+ */
+#define container_of(ptr, type, member) ({ \
+ typeof( ((type *)0)->member ) *__mptr = (ptr); \
+ (type *)( (char *)__mptr - offsetof(type,member) );})
+
+/*
+ * Check at compile time that something is of a particular type.
+ * Always evaluates to 1 so you may use it easily in comparisons.
+ */
+#define typecheck(type,x) \
+({ type __dummy; \
+ typeof(x) __dummy2; \
+ (void)(&__dummy == &__dummy2); \
+ 1; \
+})
+
+#define prefetch(x) 1
+
+/* empty define to make this work in userspace -HW */
+#ifndef smp_wmb
+#define smp_wmb()
+#endif
+
+/*
+ * These are non-NULL pointers that will result in page faults
+ * under normal circumstances, used to verify that nobody uses
+ * non-initialized list entries.
+ */
+#define LIST_POISON1 ((void *) 0x00100100)
+#define LIST_POISON2 ((void *) 0x00200200)
+
+/*
+ * Simple doubly linked list implementation.
+ *
+ * Some of the internal functions ("__xxx") are useful when
+ * manipulating whole lists rather than single entries, as
+ * sometimes we already know the next/prev entries and we can
+ * generate better code by using them directly rather than
+ * using the generic single-entry routines.
+ */
+
+struct list_head {
+ struct list_head *next, *prev;
+};
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+ struct list_head name = LIST_HEAD_INIT(name)
+
+#define INIT_LIST_HEAD(ptr) do { \
+ (ptr)->next = (ptr); (ptr)->prev = (ptr); \
+} while (0)
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_add(struct list_head *new,
+ struct list_head *prev,
+ struct list_head *next)
+{
+ next->prev = new;
+ new->next = next;
+ new->prev = prev;
+ prev->next = new;
+}
+
+/**
+ * list_add - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it after
+ *
+ * Insert a new entry after the specified head.
+ * This is good for implementing stacks.
+ */
+static inline void list_add(struct list_head *new, struct list_head *head)
+{
+ __list_add(new, head, head->next);
+}
+
+/**
+ * list_add_tail - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it before
+ *
+ * Insert a new entry before the specified head.
+ * This is useful for implementing queues.
+ */
+static inline void list_add_tail(struct list_head *new, struct list_head *head)
+{
+ __list_add(new, head->prev, head);
+}
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_add_rcu(struct list_head * new,
+ struct list_head * prev, struct list_head * next)
+{
+ new->next = next;
+ new->prev = prev;
+ smp_wmb();
+ next->prev = new;
+ prev->next = new;
+}
+
+/**
+ * list_add_rcu - add a new entry to rcu-protected list
+ * @new: new entry to be added
+ * @head: list head to add it after
+ *
+ * Insert a new entry after the specified head.
+ * This is good for implementing stacks.
+ *
+ * The caller must take whatever precautions are necessary
+ * (such as holding appropriate locks) to avoid racing
+ * with another list-mutation primitive, such as list_add_rcu()
+ * or list_del_rcu(), running on this same list.
+ * However, it is perfectly legal to run concurrently with
+ * the _rcu list-traversal primitives, such as
+ * list_for_each_entry_rcu().
+ */
+static inline void list_add_rcu(struct list_head *new, struct list_head *head)
+{
+ __list_add_rcu(new, head, head->next);
+}
+
+/**
+ * list_add_tail_rcu - add a new entry to rcu-protected list
+ * @new: new entry to be added
+ * @head: list head to add it before
+ *
+ * Insert a new entry before the specified head.
+ * This is useful for implementing queues.
+ *
+ * The caller must take whatever precautions are necessary
+ * (such as holding appropriate locks) to avoid racing
+ * with another list-mutation primitive, such as list_add_tail_rcu()
+ * or list_del_rcu(), running on this same list.
+ * However, it is perfectly legal to run concurrently with
+ * the _rcu list-traversal primitives, such as
+ * list_for_each_entry_rcu().
+ */
+static inline void list_add_tail_rcu(struct list_head *new,
+ struct list_head *head)
+{
+ __list_add_rcu(new, head->prev, head);
+}
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_del(struct list_head * prev, struct list_head * next)
+{
+ next->prev = prev;
+ prev->next = next;
+}
+
+/**
+ * list_del - deletes entry from list.
+ * @entry: the element to delete from the list.
+ * Note: list_empty on entry does not return true after this, the entry is
+ * in an undefined state.
+ */
+static inline void list_del(struct list_head *entry)
+{
+ __list_del(entry->prev, entry->next);
+ entry->next = LIST_POISON1;
+ entry->prev = LIST_POISON2;
+}
+
+/**
+ * list_del_rcu - deletes entry from list without re-initialization
+ * @entry: the element to delete from the list.
+ *
+ * Note: list_empty on entry does not return true after this,
+ * the entry is in an undefined state. It is useful for RCU based
+ * lockfree traversal.
+ *
+ * In particular, it means that we can not poison the forward
+ * pointers that may still be used for walking the list.
+ *
+ * The caller must take whatever precautions are necessary
+ * (such as holding appropriate locks) to avoid racing
+ * with another list-mutation primitive, such as list_del_rcu()
+ * or list_add_rcu(), running on this same list.
+ * However, it is perfectly legal to run concurrently with
+ * the _rcu list-traversal primitives, such as
+ * list_for_each_entry_rcu().
+ *
+ * Note that the caller is not permitted to immediately free
+ * the newly deleted entry. Instead, either synchronize_kernel()
+ * or call_rcu() must be used to defer freeing until an RCU
+ * grace period has elapsed.
+ */
+static inline void list_del_rcu(struct list_head *entry)
+{
+ __list_del(entry->prev, entry->next);
+ entry->prev = LIST_POISON2;
+}
+
+/**
+ * list_del_init - deletes entry from list and reinitialize it.
+ * @entry: the element to delete from the list.
+ */
+static inline void list_del_init(struct list_head *entry)
+{
+ __list_del(entry->prev, entry->next);
+ INIT_LIST_HEAD(entry);
+}
+
+/**
+ * list_move - delete from one list and add as another's head
+ * @list: the entry to move
+ * @head: the head that will precede our entry
+ */
+static inline void list_move(struct list_head *list, struct list_head *head)
+{
+ __list_del(list->prev, list->next);
+ list_add(list, head);
+}
+
+/**
+ * list_move_tail - delete from one list and add as another's tail
+ * @list: the entry to move
+ * @head: the head that will follow our entry
+ */
+static inline void list_move_tail(struct list_head *list,
+ struct list_head *head)
+{
+ __list_del(list->prev, list->next);
+ list_add_tail(list, head);
+}
+
+/**
+ * list_empty - tests whether a list is empty
+ * @head: the list to test.
+ */
+static inline int list_empty(const struct list_head *head)
+{
+ return head->next == head;
+}
+
+/**
+ * list_empty_careful - tests whether a list is
+ * empty _and_ checks that no other CPU might be
+ * in the process of still modifying either member
+ *
+ * NOTE: using list_empty_careful() without synchronization
+ * can only be safe if the only activity that can happen
+ * to the list entry is list_del_init(). Eg. it cannot be used
+ * if another CPU could re-list_add() it.
+ *
+ * @head: the list to test.
+ */
+static inline int list_empty_careful(const struct list_head *head)
+{
+ struct list_head *next = head->next;
+ return (next == head) && (next == head->prev);
+}
+
+static inline void __list_splice(struct list_head *list,
+ struct list_head *head)
+{
+ struct list_head *first = list->next;
+ struct list_head *last = list->prev;
+ struct list_head *at = head->next;
+
+ first->prev = head;
+ head->next = first;
+
+ last->next = at;
+ at->prev = last;
+}
+
+/**
+ * list_splice - join two lists
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ */
+static inline void list_splice(struct list_head *list, struct list_head *head)
+{
+ if (!list_empty(list))
+ __list_splice(list, head);
+}
+
+/**
+ * list_splice_init - join two lists and reinitialise the emptied list.
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ *
+ * The list at @list is reinitialised
+ */
+static inline void list_splice_init(struct list_head *list,
+ struct list_head *head)
+{
+ if (!list_empty(list)) {
+ __list_splice(list, head);
+ INIT_LIST_HEAD(list);
+ }
+}
+
+/**
+ * list_entry - get the struct for this entry
+ * @ptr: the &struct list_head pointer.
+ * @type: the type of the struct this is embedded in.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_entry(ptr, type, member) \
+ container_of(ptr, type, member)
+
+/**
+ * list_for_each - iterate over a list
+ * @pos: the &struct list_head to use as a loop counter.
+ * @head: the head for your list.
+ */
+#define list_for_each(pos, head) \
+ for (pos = (head)->next, prefetch(pos->next); pos != (head); \
+ pos = pos->next, prefetch(pos->next))
+
+/**
+ * __list_for_each - iterate over a list
+ * @pos: the &struct list_head to use as a loop counter.
+ * @head: the head for your list.
+ *
+ * This variant differs from list_for_each() in that it's the
+ * simplest possible list iteration code, no prefetching is done.
+ * Use this for code that knows the list to be very short (empty
+ * or 1 entry) most of the time.
+ */
+#define __list_for_each(pos, head) \
+ for (pos = (head)->next; pos != (head); pos = pos->next)
+
+/**
+ * list_for_each_prev - iterate over a list backwards
+ * @pos: the &struct list_head to use as a loop counter.
+ * @head: the head for your list.
+ */
+#define list_for_each_prev(pos, head) \
+ for (pos = (head)->prev, prefetch(pos->prev); pos != (head); \
+ pos = pos->prev, prefetch(pos->prev))
+
+/**
+ * list_for_each_safe - iterate over a list safe against removal of list entry
+ * @pos: the &struct list_head to use as a loop counter.
+ * @n: another &struct list_head to use as temporary storage
+ * @head: the head for your list.
+ */
+#define list_for_each_safe(pos, n, head) \
+ for (pos = (head)->next, n = pos->next; pos != (head); \
+ pos = n, n = pos->next)
+
+/**
+ * list_for_each_entry - iterate over list of given type
+ * @pos: the type * to use as a loop counter.
+ * @head: the head for your list.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_for_each_entry(pos, head, member) \
+ for (pos = list_entry((head)->next, typeof(*pos), member), \
+ prefetch(pos->member.next); \
+ &pos->member != (head); \
+ pos = list_entry(pos->member.next, typeof(*pos), member), \
+ prefetch(pos->member.next))
+
+/**
+ * list_for_each_entry_reverse - iterate backwards over list of given type.
+ * @pos: the type * to use as a loop counter.
+ * @head: the head for your list.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_reverse(pos, head, member) \
+ for (pos = list_entry((head)->prev, typeof(*pos), member), \
+ prefetch(pos->member.prev); \
+ &pos->member != (head); \
+ pos = list_entry(pos->member.prev, typeof(*pos), member), \
+ prefetch(pos->member.prev))
+
+/**
+ * list_prepare_entry - prepare a pos entry for use as a start point in
+ * list_for_each_entry_continue
+ * @pos: the type * to use as a start point
+ * @head: the head of the list
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_prepare_entry(pos, head, member) \
+ ((pos) ? : list_entry(head, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_continue - iterate over list of given type
+ * continuing after existing point
+ * @pos: the type * to use as a loop counter.
+ * @head: the head for your list.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_continue(pos, head, member) \
+ for (pos = list_entry(pos->member.next, typeof(*pos), member), \
+ prefetch(pos->member.next); \
+ &pos->member != (head); \
+ pos = list_entry(pos->member.next, typeof(*pos), member), \
+ prefetch(pos->member.next))
+
+/**
+ * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @pos: the type * to use as a loop counter.
+ * @n: another type * to use as temporary storage
+ * @head: the head for your list.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe(pos, n, head, member) \
+ for (pos = list_entry((head)->next, typeof(*pos), member), \
+ n = list_entry(pos->member.next, typeof(*pos), member); \
+ &pos->member != (head); \
+ pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+/**
+ * list_for_each_rcu - iterate over an rcu-protected list
+ * @pos: the &struct list_head to use as a loop counter.
+ * @head: the head for your list.
+ *
+ * This list-traversal primitive may safely run concurrently with
+ * the _rcu list-mutation primitives such as list_add_rcu()
+ * as long as the traversal is guarded by rcu_read_lock().
+ */
+#define list_for_each_rcu(pos, head) \
+ for (pos = (head)->next, prefetch(pos->next); pos != (head); \
+ pos = pos->next, ({ smp_read_barrier_depends(); 0;}), prefetch(pos->next))
+
+#define __list_for_each_rcu(pos, head) \
+ for (pos = (head)->next; pos != (head); \
+ pos = pos->next, ({ smp_read_barrier_depends(); 0;}))
+
+/**
+ * list_for_each_safe_rcu - iterate over an rcu-protected list safe
+ * against removal of list entry
+ * @pos: the &struct list_head to use as a loop counter.
+ * @n: another &struct list_head to use as temporary storage
+ * @head: the head for your list.
+ *
+ * This list-traversal primitive may safely run concurrently with
+ * the _rcu list-mutation primitives such as list_add_rcu()
+ * as long as the traversal is guarded by rcu_read_lock().
+ */
+#define list_for_each_safe_rcu(pos, n, head) \
+ for (pos = (head)->next, n = pos->next; pos != (head); \
+ pos = n, ({ smp_read_barrier_depends(); 0;}), n = pos->next)
+
+/**
+ * list_for_each_entry_rcu - iterate over rcu list of given type
+ * @pos: the type * to use as a loop counter.
+ * @head: the head for your list.
+ * @member: the name of the list_struct within the struct.
+ *
+ * This list-traversal primitive may safely run concurrently with
+ * the _rcu list-mutation primitives such as list_add_rcu()
+ * as long as the traversal is guarded by rcu_read_lock().
+ */
+#define list_for_each_entry_rcu(pos, head, member) \
+ for (pos = list_entry((head)->next, typeof(*pos), member), \
+ prefetch(pos->member.next); \
+ &pos->member != (head); \
+ pos = list_entry(pos->member.next, typeof(*pos), member), \
+ ({ smp_read_barrier_depends(); 0;}), \
+ prefetch(pos->member.next))
+
+
+/**
+ * list_for_each_continue_rcu - iterate over an rcu-protected list
+ * continuing after existing point.
+ * @pos: the &struct list_head to use as a loop counter.
+ * @head: the head for your list.
+ *
+ * This list-traversal primitive may safely run concurrently with
+ * the _rcu list-mutation primitives such as list_add_rcu()
+ * as long as the traversal is guarded by rcu_read_lock().
+ */
+#define list_for_each_continue_rcu(pos, head) \
+ for ((pos) = (pos)->next, prefetch((pos)->next); (pos) != (head); \
+ (pos) = (pos)->next, ({ smp_read_barrier_depends(); 0;}), prefetch((pos)->next))
+
+/*
+ * Double linked lists with a single pointer list head.
+ * Mostly useful for hash tables where the two pointer list head is
+ * too wasteful.
+ * You lose the ability to access the tail in O(1).
+ */
+
+struct hlist_head {
+ struct hlist_node *first;
+};
+
+struct hlist_node {
+ struct hlist_node *next, **pprev;
+};
+
+#define HLIST_HEAD_INIT { .first = NULL }
+#define HLIST_HEAD(name) struct hlist_head name = { .first = NULL }
+#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
+#define INIT_HLIST_NODE(ptr) ((ptr)->next = NULL, (ptr)->pprev = NULL)
+
+static inline int hlist_unhashed(const struct hlist_node *h)
+{
+ return !h->pprev;
+}
+
+static inline int hlist_empty(const struct hlist_head *h)
+{
+ return !h->first;
+}
+
+static inline void __hlist_del(struct hlist_node *n)
+{
+ struct hlist_node *next = n->next;
+ struct hlist_node **pprev = n->pprev;
+ *pprev = next;
+ if (next)
+ next->pprev = pprev;
+}
+
+static inline void hlist_del(struct hlist_node *n)
+{
+ __hlist_del(n);
+ n->next = LIST_POISON1;
+ n->pprev = LIST_POISON2;
+}
+
+/**
+ * hlist_del_rcu - deletes entry from hash list without re-initialization
+ * @n: the element to delete from the hash list.
+ *
+ * Note: list_unhashed() on entry does not return true after this,
+ * the entry is in an undefined state. It is useful for RCU based
+ * lockfree traversal.
+ *
+ * In particular, it means that we can not poison the forward
+ * pointers that may still be used for walking the hash list.
+ *
+ * The caller must take whatever precautions are necessary
+ * (such as holding appropriate locks) to avoid racing
+ * with another list-mutation primitive, such as hlist_add_head_rcu()
+ * or hlist_del_rcu(), running on this same list.
+ * However, it is perfectly legal to run concurrently with
+ * the _rcu list-traversal primitives, such as
+ * hlist_for_each_entry().
+ */
+static inline void hlist_del_rcu(struct hlist_node *n)
+{
+ __hlist_del(n);
+ n->pprev = LIST_POISON2;
+}
+
+static inline void hlist_del_init(struct hlist_node *n)
+{
+ if (n->pprev) {
+ __hlist_del(n);
+ INIT_HLIST_NODE(n);
+ }
+}
+
+#define hlist_del_rcu_init hlist_del_init
+
+static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
+{
+ struct hlist_node *first = h->first;
+ n->next = first;
+ if (first)
+ first->pprev = &n->next;
+ h->first = n;
+ n->pprev = &h->first;
+}
+
+
+/**
+ * hlist_add_head_rcu - adds the specified element to the specified hlist,
+ * while permitting racing traversals.
+ * @n: the element to add to the hash list.
+ * @h: the list to add to.
+ *
+ * The caller must take whatever precautions are necessary
+ * (such as holding appropriate locks) to avoid racing
+ * with another list-mutation primitive, such as hlist_add_head_rcu()
+ * or hlist_del_rcu(), running on this same list.
+ * However, it is perfectly legal to run concurrently with
+ * the _rcu list-traversal primitives, such as
+ * hlist_for_each_entry(), but only if smp_read_barrier_depends()
+ * is used to prevent memory-consistency problems on Alpha CPUs.
+ * Regardless of the type of CPU, the list-traversal primitive
+ * must be guarded by rcu_read_lock().
+ *
+ * OK, so why don't we have an hlist_for_each_entry_rcu()???
+ */
+static inline void hlist_add_head_rcu(struct hlist_node *n,
+ struct hlist_head *h)
+{
+ struct hlist_node *first = h->first;
+ n->next = first;
+ n->pprev = &h->first;
+ smp_wmb();
+ if (first)
+ first->pprev = &n->next;
+ h->first = n;
+}
+
+/* next must be != NULL */
+static inline void hlist_add_before(struct hlist_node *n,
+ struct hlist_node *next)
+{
+ n->pprev = next->pprev;
+ n->next = next;
+ next->pprev = &n->next;
+ *(n->pprev) = n;
+}
+
+static inline void hlist_add_after(struct hlist_node *n,
+ struct hlist_node *next)
+{
+ next->next = n->next;
+ n->next = next;
+ next->pprev = &n->next;
+
+ if(next->next)
+ next->next->pprev = &next->next;
+}
+
+#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
+
+#define hlist_for_each(pos, head) \
+ for (pos = (head)->first; pos && ({ prefetch(pos->next); 1; }); \
+ pos = pos->next)
+
+#define hlist_for_each_safe(pos, n, head) \
+ for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \
+ pos = n)
+
+/**
+ * hlist_for_each_entry - iterate over list of given type
+ * @tpos: the type * to use as a loop counter.
+ * @pos: the &struct hlist_node to use as a loop counter.
+ * @head: the head for your list.
+ * @member: the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry(tpos, pos, head, member) \
+ for (pos = (head)->first; \
+ pos && ({ prefetch(pos->next); 1;}) && \
+ ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+ pos = pos->next)
+
+/**
+ * hlist_for_each_entry_continue - iterate over a hlist continuing after existing point
+ * @tpos: the type * to use as a loop counter.
+ * @pos: the &struct hlist_node to use as a loop counter.
+ * @member: the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_continue(tpos, pos, member) \
+ for (pos = (pos)->next; \
+ pos && ({ prefetch(pos->next); 1;}) && \
+ ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+ pos = pos->next)
+
+/**
+ * hlist_for_each_entry_from - iterate over a hlist continuing from existing point
+ * @tpos: the type * to use as a loop counter.
+ * @pos: the &struct hlist_node to use as a loop counter.
+ * @member: the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_from(tpos, pos, member) \
+ for (; pos && ({ prefetch(pos->next); 1;}) && \
+ ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+ pos = pos->next)
+
+/**
+ * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @tpos: the type * to use as a loop counter.
+ * @pos: the &struct hlist_node to use as a loop counter.
+ * @n: another &struct hlist_node to use as temporary storage
+ * @head: the head for your list.
+ * @member: the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_safe(tpos, pos, n, head, member) \
+ for (pos = (head)->first; \
+ pos && ({ n = pos->next; 1; }) && \
+ ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+ pos = n)
+
+/**
+ * hlist_for_each_entry_rcu - iterate over rcu list of given type
+ * @pos: the type * to use as a loop counter.
+ * @pos: the &struct hlist_node to use as a loop counter.
+ * @head: the head for your list.
+ * @member: the name of the hlist_node within the struct.
+ *
+ * This list-traversal primitive may safely run concurrently with
+ * the _rcu list-mutation primitives such as hlist_add_rcu()
+ * as long as the traversal is guarded by rcu_read_lock().
+ */
+#define hlist_for_each_entry_rcu(tpos, pos, head, member) \
+ for (pos = (head)->first; \
+ pos && ({ prefetch(pos->next); 1;}) && \
+ ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+ pos = pos->next, ({ smp_read_barrier_depends(); 0; }) )
+
+#endif
diff --git a/src/iftable.c b/src/iftable.c
index 7e6172b..b6a8e72 100644
--- a/src/iftable.c
+++ b/src/iftable.c
@@ -1,9 +1,9 @@
/* iftable - table of network interfaces
*
* (C) 2004 by Astaro AG, written by Harald Welte <hwelte at astaro.com>
+ * (C) 2008 by Pablo Neira Ayuso <pablo at netfilter.org>
*
* This software is Free Software and licensed under GNU GPLv2.
- *
*/
/* IFINDEX handling */
@@ -22,11 +22,10 @@
#include <libnfnetlink/libnfnetlink.h>
#include "rtnl.h"
+#include "linux_list.h"
-#define iftb_log(x, ...)
-
-struct ifindex_map {
- struct ifindex_map *next;
+struct ifindex_node {
+ struct list_head head;
u_int32_t index;
u_int32_t type;
@@ -37,7 +36,7 @@ struct ifindex_map {
};
struct nlif_handle {
- struct ifindex_map *ifindex_map[16];
+ struct list_head ifindex_hash[16];
struct rtnl_handle *rtnl_handle;
struct rtnl_handler ifadd_handler;
struct rtnl_handler ifdel_handler;
@@ -52,65 +51,55 @@ struct nlif_handle {
*/
static int iftable_add(struct nlmsghdr *n, void *arg)
{
- unsigned int hash;
+ unsigned int hash, found = 0;
struct ifinfomsg *ifi_msg = NLMSG_DATA(n);
- struct ifindex_map *im, **imp;
+ struct ifindex_node *this;
struct rtattr *cb[IFLA_MAX+1];
- struct nlif_handle *nlif_handle = (struct nlif_handle *)arg;
+ struct nlif_handle *h = (struct nlif_handle *)arg;
if (n->nlmsg_type != RTM_NEWLINK)
return -1;
- if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi_msg))) {
- iftb_log(LOG_ERROR, "short message (%u < %u)",
- n->nlmsg_len, NLMSG_LENGTH(sizeof(ifi_msg)));
+ if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi_msg)))
return -1;
- }
- memset(&cb, 0, sizeof(cb));
rtnl_parse_rtattr(cb, IFLA_MAX, IFLA_RTA(ifi_msg), IFLA_PAYLOAD(n));
- if (!cb[IFLA_IFNAME]) {
- iftb_log(LOG_ERROR, "interface without name?");
+
+ if (!cb[IFLA_IFNAME])
return -1;
- }
- hash = ifi_msg->ifi_index&0xF;
- for (imp = &((nlif_handle->ifindex_map)[hash]);
- (im=*imp)!=NULL; imp = &im->next) {
- if (im->index == ifi_msg->ifi_index) {
- iftb_log(LOG_DEBUG,
- "updating iftable (ifindex=%u)", im->index);
+ hash = ifi_msg->ifi_index & 0xF;
+ list_for_each_entry(this, &h->ifindex_hash[hash], head) {
+ if (this->index == ifi_msg->ifi_index) {
+ found = 1;
break;
}
}
- if (!im) {
- im = malloc(sizeof(*im));
- if (!im) {
- iftb_log(LOG_ERROR,
- "ENOMEM while allocating ifindex_map");
- return 0;
- }
- im->next = *imp;
- im->index = ifi_msg->ifi_index;
- *imp = im;
- iftb_log(LOG_DEBUG, "creating new iftable (ifindex=%u)",
- im->index);
+ if (!found) {
+ this = malloc(sizeof(*this));
+ if (!this)
+ return -1;
+
+ this->index = ifi_msg->ifi_index;
}
-
- im->type = ifi_msg->ifi_type;
- im->flags = ifi_msg->ifi_flags;
+
+ this->type = ifi_msg->ifi_type;
+ this->flags = ifi_msg->ifi_flags;
if (cb[IFLA_ADDRESS]) {
unsigned int alen;
- im->alen = alen = RTA_PAYLOAD(cb[IFLA_ADDRESS]);
- if (alen > sizeof(im->addr))
- alen = sizeof(im->addr);
- memcpy(im->addr, RTA_DATA(cb[IFLA_ADDRESS]), alen);
+ this->alen = alen = RTA_PAYLOAD(cb[IFLA_ADDRESS]);
+ if (alen > sizeof(this->addr))
+ alen = sizeof(this->addr);
+ memcpy(this->addr, RTA_DATA(cb[IFLA_ADDRESS]), alen);
} else {
- im->alen = 0;
- memset(im->addr, 0, sizeof(im->addr));
+ this->alen = 0;
+ memset(this->addr, 0, sizeof(this->addr));
}
- strcpy(im->name, RTA_DATA(cb[IFLA_IFNAME]));
+ strcpy(this->name, RTA_DATA(cb[IFLA_IFNAME]));
+
+ list_add(&this->head, &h->ifindex_hash[hash]);
+
return 1;
}
@@ -125,46 +114,28 @@ static int iftable_del(struct nlmsghdr *n, void *arg)
{
struct ifinfomsg *ifi_msg = NLMSG_DATA(n);
struct rtattr *cb[IFLA_MAX+1];
- struct nlif_handle *nlif_handle = (struct nlif_handle *)arg;
- struct ifindex_map *im, *ima, **imp;
+ struct nlif_handle *h = (struct nlif_handle *)arg;
+ struct ifindex_node *this, *tmp;
unsigned int hash;
- if (n->nlmsg_type != RTM_DELLINK) {
- iftb_log(LOG_ERROR,
- "called with wrong nlmsg_type %u", n->nlmsg_type);
+ if (n->nlmsg_type != RTM_DELLINK)
return -1;
- }
- if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi_msg))) {
- iftb_log(LOG_ERROR, "short message (%u < %u)",
- n->nlmsg_len, NLMSG_LENGTH(sizeof(ifi_msg)));
+ if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi_msg)))
return -1;
- }
- memset(&cb, 0, sizeof(cb));
rtnl_parse_rtattr(cb, IFLA_MAX, IFLA_RTA(ifi_msg), IFLA_PAYLOAD(n));
- /* \todo Really suppress entry */
- hash = ifi_msg->ifi_index&0xF;
- for (ima = NULL, imp = &((nlif_handle->ifindex_map)[hash]);
- (im=*imp)!=NULL; imp = &im->next, ima=im) {
- if (im->index == ifi_msg->ifi_index) {
- iftb_log(LOG_DEBUG,
- "deleting iftable (ifindex=%u)", im->index);
- break;
+ hash = ifi_msg->ifi_index & 0xF;
+ list_for_each_entry_safe(this, tmp, &h->ifindex_hash[hash], head) {
+ if (this->index == ifi_msg->ifi_index) {
+ list_del(&this->head);
+ free(this);
+ return 1;
}
}
- if (!im)
- return 0;
-
- if (ima)
- ima->next = *imp;
- else
- (nlif_handle->ifindex_map)[hash] = *imp;
- free(im);
-
- return 1;
+ return 0;
}
/** Get the name for an ifindex
@@ -174,36 +145,42 @@ static int iftable_del(struct nlmsghdr *n, void *arg)
* \param name interface name, pass a buffer of IFNAMSIZ size
* \return -1 on error, 1 on success
*/
-int nlif_index2name(struct nlif_handle *nlif_handle,
+int nlif_index2name(struct nlif_handle *h,
unsigned int index,
char *name)
{
- struct ifindex_map *im;
+ unsigned int hash;
+ struct ifindex_node *this;
- assert(nlif_handle != NULL);
+ assert(h != NULL);
assert(name != NULL);
if (index == 0) {
strcpy(name, "*");
return 1;
}
- for (im = (nlif_handle->ifindex_map)[index&0xF]; im; im = im->next)
- if (im->index == index) {
- strcpy(name, im->name);
+
+ hash = index & 0xF;
+ list_for_each_entry(this, &h->ifindex_hash[hash], head) {
+ if (this->index == index) {
+ strcpy(name, this->name);
return 1;
}
+ }
errno = ENOENT;
return -1;
}
-static int iftable_up(struct nlif_handle *nlif_handle, unsigned int index)
+static int iftable_up(struct nlif_handle *h, unsigned int index)
{
- struct ifindex_map *im;
+ unsigned int hash;
+ struct ifindex_node *this;
- for (im = nlif_handle->ifindex_map[index&0xF]; im; im = im->next) {
- if (im->index == index) {
- if (im->flags & IFF_UP)
+ hash = index & 0xF;
+ list_for_each_entry(this, &h->ifindex_hash[hash], head) {
+ if (this->index == index) {
+ if (this->flags & IFF_UP)
return 1;
else
return 0;
@@ -221,12 +198,16 @@ static int iftable_up(struct nlif_handle *nlif_handle, unsigned int index)
*/
struct nlif_handle *nlif_open(void)
{
+ int i;
struct nlif_handle *h;
h = calloc(1, sizeof(struct nlif_handle));
if (h == NULL)
goto err;
+ for (i=0; i<16; i++)
+ INIT_LIST_HEAD(&h->ifindex_hash[i]);
+
h->ifadd_handler.nlmsg_type = RTM_NEWLINK;
h->ifadd_handler.handlefn = iftable_add;
h->ifadd_handler.arg = h;
@@ -262,11 +243,22 @@ err:
*/
void nlif_close(struct nlif_handle *h)
{
+ int i;
+ struct ifindex_node *this, *tmp;
+
assert(h != NULL);
rtnl_handler_unregister(h->rtnl_handle, &h->ifadd_handler);
rtnl_handler_unregister(h->rtnl_handle, &h->ifdel_handler);
rtnl_close(h->rtnl_handle);
+
+ for (i=0; i<16; i++) {
+ list_for_each_entry_safe(this, tmp, &h->ifindex_hash[i], head) {
+ list_del(&this->head);
+ free(this);
+ }
+ }
+
free(h);
h = NULL; /* bugtrap */
}
@@ -276,12 +268,12 @@ void nlif_close(struct nlif_handle *h)
* \param nlif_handle A pointer to a ::nlif_handle created
* \return 0 if OK
*/
-int nlif_catch(struct nlif_handle *nlif_handle)
+int nlif_catch(struct nlif_handle *h)
{
- assert(nlif_handle != NULL);
+ assert(h != NULL);
- if (nlif_handle->rtnl_handle)
- return rtnl_receive(nlif_handle->rtnl_handle);
+ if (h->rtnl_handle)
+ return rtnl_receive(h->rtnl_handle);
return -1;
}
@@ -305,12 +297,12 @@ int nlif_query(struct nlif_handle *h)
* \param nlif_handle A pointer to a ::nlif_handle created
* \return The fd or -1 if there's an error
*/
-int nlif_fd(struct nlif_handle *nlif_handle)
+int nlif_fd(struct nlif_handle *h)
{
- assert(nlif_handle != NULL);
+ assert(h != NULL);
- if (nlif_handle->rtnl_handle)
- return nlif_handle->rtnl_handle->rtnl_fd;
+ if (h->rtnl_handle)
+ return h->rtnl_handle->rtnl_fd;
return -1;
}
diff --git a/src/rtnl.c b/src/rtnl.c
index 0206d30..29fc184 100644
--- a/src/rtnl.c
+++ b/src/rtnl.c
@@ -91,9 +91,10 @@ int rtnl_handler_unregister(struct rtnl_handle *rtnl_handle,
return 0;
}
-/* rtnl_arse_rtattr - parse rtattr */
int rtnl_parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
{
+ memset(tb, 0, sizeof(struct rtattr *) * max);
+
while (RTA_OK(rta, len)) {
if (rta->rta_type <= max)
tb[rta->rta_type] = rta;
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