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net/netfilter/x_tables.c
32.5 KB
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/* * x_tables core - Backend for {ip,ip6,arp}_tables * * Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> * * Based on existing ip_tables code which is * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling * 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 * published by the Free Software Foundation. * */ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/kernel.h> #include <linux/socket.h> #include <linux/net.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/string.h> #include <linux/vmalloc.h> |
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#include <linux/mutex.h> |
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#include <linux/mm.h> |
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#include <linux/slab.h> |
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#include <linux/audit.h> |
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#include <net/net_namespace.h> |
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#include <linux/netfilter/x_tables.h> #include <linux/netfilter_arp.h> |
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#include <linux/netfilter_ipv4/ip_tables.h> #include <linux/netfilter_ipv6/ip6_tables.h> #include <linux/netfilter_arp/arp_tables.h> |
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MODULE_LICENSE("GPL"); MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
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MODULE_DESCRIPTION("{ip,ip6,arp,eb}_tables backend module"); |
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#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1)) |
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struct compat_delta { |
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unsigned int offset; /* offset in kernel */ int delta; /* delta in 32bit user land */ |
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}; |
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struct xt_af { |
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struct mutex mutex; |
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struct list_head match; struct list_head target; |
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#ifdef CONFIG_COMPAT |
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struct mutex compat_mutex; |
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struct compat_delta *compat_tab; unsigned int number; /* number of slots in compat_tab[] */ unsigned int cur; /* number of used slots in compat_tab[] */ |
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#endif |
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}; static struct xt_af *xt; |
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static const char *const xt_prefix[NFPROTO_NUMPROTO] = { [NFPROTO_UNSPEC] = "x", [NFPROTO_IPV4] = "ip", [NFPROTO_ARP] = "arp", [NFPROTO_BRIDGE] = "eb", [NFPROTO_IPV6] = "ip6", |
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}; |
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/* Allow this many total (re)entries. */ static const unsigned int xt_jumpstack_multiplier = 2; |
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/* Registration hooks for targets. */ int |
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xt_register_target(struct xt_target *target) |
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{ |
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u_int8_t af = target->family; int ret; |
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|
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ret = mutex_lock_interruptible(&xt[af].mutex); |
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if (ret != 0) return ret; list_add(&target->list, &xt[af].target); |
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mutex_unlock(&xt[af].mutex); |
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return ret; } EXPORT_SYMBOL(xt_register_target); void |
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xt_unregister_target(struct xt_target *target) |
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{ |
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u_int8_t af = target->family; |
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|
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mutex_lock(&xt[af].mutex); |
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list_del(&target->list); |
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mutex_unlock(&xt[af].mutex); |
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} EXPORT_SYMBOL(xt_unregister_target); int |
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xt_register_targets(struct xt_target *target, unsigned int n) { unsigned int i; int err = 0; for (i = 0; i < n; i++) { err = xt_register_target(&target[i]); if (err) goto err; } return err; err: if (i > 0) xt_unregister_targets(target, i); return err; } EXPORT_SYMBOL(xt_register_targets); void xt_unregister_targets(struct xt_target *target, unsigned int n) { |
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while (n-- > 0) xt_unregister_target(&target[n]); |
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} EXPORT_SYMBOL(xt_unregister_targets); int |
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xt_register_match(struct xt_match *match) |
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{ |
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u_int8_t af = match->family; int ret; |
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|
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ret = mutex_lock_interruptible(&xt[af].mutex); |
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if (ret != 0) return ret; list_add(&match->list, &xt[af].match); |
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mutex_unlock(&xt[af].mutex); |
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return ret; } EXPORT_SYMBOL(xt_register_match); void |
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xt_unregister_match(struct xt_match *match) |
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{ |
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u_int8_t af = match->family; |
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|
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mutex_lock(&xt[af].mutex); |
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list_del(&match->list); |
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mutex_unlock(&xt[af].mutex); |
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} EXPORT_SYMBOL(xt_unregister_match); |
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int xt_register_matches(struct xt_match *match, unsigned int n) { unsigned int i; int err = 0; for (i = 0; i < n; i++) { err = xt_register_match(&match[i]); if (err) goto err; } return err; err: if (i > 0) xt_unregister_matches(match, i); return err; } EXPORT_SYMBOL(xt_register_matches); void xt_unregister_matches(struct xt_match *match, unsigned int n) { |
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while (n-- > 0) xt_unregister_match(&match[n]); |
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} EXPORT_SYMBOL(xt_unregister_matches); |
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/* * These are weird, but module loading must not be done with mutex * held (since they will register), and we have to have a single |
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* function to use. |
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*/ /* Find match, grabs ref. Returns ERR_PTR() on error. */ |
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struct xt_match *xt_find_match(u8 af, const char *name, u8 revision) |
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{ struct xt_match *m; |
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int err = -ENOENT; |
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|
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if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
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return ERR_PTR(-EINTR); list_for_each_entry(m, &xt[af].match, list) { if (strcmp(m->name, name) == 0) { if (m->revision == revision) { if (try_module_get(m->me)) { |
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mutex_unlock(&xt[af].mutex); |
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return m; } } else err = -EPROTOTYPE; /* Found something. */ } } |
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mutex_unlock(&xt[af].mutex); |
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if (af != NFPROTO_UNSPEC) /* Try searching again in the family-independent list */ return xt_find_match(NFPROTO_UNSPEC, name, revision); |
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return ERR_PTR(err); } EXPORT_SYMBOL(xt_find_match); |
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struct xt_match * xt_request_find_match(uint8_t nfproto, const char *name, uint8_t revision) { struct xt_match *match; |
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match = xt_find_match(nfproto, name, revision); if (IS_ERR(match)) { request_module("%st_%s", xt_prefix[nfproto], name); match = xt_find_match(nfproto, name, revision); } return match; |
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} EXPORT_SYMBOL_GPL(xt_request_find_match); |
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/* Find target, grabs ref. Returns ERR_PTR() on error. */ |
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struct xt_target *xt_find_target(u8 af, const char *name, u8 revision) |
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{ struct xt_target *t; |
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int err = -ENOENT; |
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|
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if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
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return ERR_PTR(-EINTR); list_for_each_entry(t, &xt[af].target, list) { if (strcmp(t->name, name) == 0) { if (t->revision == revision) { if (try_module_get(t->me)) { |
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mutex_unlock(&xt[af].mutex); |
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return t; } } else err = -EPROTOTYPE; /* Found something. */ } } |
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mutex_unlock(&xt[af].mutex); |
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if (af != NFPROTO_UNSPEC) /* Try searching again in the family-independent list */ return xt_find_target(NFPROTO_UNSPEC, name, revision); |
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return ERR_PTR(err); } EXPORT_SYMBOL(xt_find_target); |
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struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision) |
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{ struct xt_target *target; |
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target = xt_find_target(af, name, revision); if (IS_ERR(target)) { request_module("%st_%s", xt_prefix[af], name); target = xt_find_target(af, name, revision); } return target; |
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} EXPORT_SYMBOL_GPL(xt_request_find_target); |
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static int match_revfn(u8 af, const char *name, u8 revision, int *bestp) |
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{ |
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const struct xt_match *m; |
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int have_rev = 0; list_for_each_entry(m, &xt[af].match, list) { if (strcmp(m->name, name) == 0) { if (m->revision > *bestp) *bestp = m->revision; if (m->revision == revision) have_rev = 1; } } |
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if (af != NFPROTO_UNSPEC && !have_rev) return match_revfn(NFPROTO_UNSPEC, name, revision, bestp); |
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return have_rev; } |
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static int target_revfn(u8 af, const char *name, u8 revision, int *bestp) |
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{ |
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const struct xt_target *t; |
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int have_rev = 0; list_for_each_entry(t, &xt[af].target, list) { if (strcmp(t->name, name) == 0) { if (t->revision > *bestp) *bestp = t->revision; if (t->revision == revision) have_rev = 1; } } |
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if (af != NFPROTO_UNSPEC && !have_rev) return target_revfn(NFPROTO_UNSPEC, name, revision, bestp); |
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return have_rev; } /* Returns true or false (if no such extension at all) */ |
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int xt_find_revision(u8 af, const char *name, u8 revision, int target, |
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int *err) { int have_rev, best = -1; |
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if (mutex_lock_interruptible(&xt[af].mutex) != 0) { |
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*err = -EINTR; return 1; } if (target == 1) have_rev = target_revfn(af, name, revision, &best); else have_rev = match_revfn(af, name, revision, &best); |
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mutex_unlock(&xt[af].mutex); |
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/* Nothing at all? Return 0 to try loading module. */ if (best == -1) { *err = -ENOENT; return 0; } *err = best; if (!have_rev) *err = -EPROTONOSUPPORT; return 1; } EXPORT_SYMBOL_GPL(xt_find_revision); |
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static char *textify_hooks(char *buf, size_t size, unsigned int mask) { static const char *const names[] = { "PREROUTING", "INPUT", "FORWARD", "OUTPUT", "POSTROUTING", "BROUTING", }; unsigned int i; char *p = buf; bool np = false; int res; *p = '\0'; for (i = 0; i < ARRAY_SIZE(names); ++i) { if (!(mask & (1 << i))) continue; res = snprintf(p, size, "%s%s", np ? "/" : "", names[i]); if (res > 0) { size -= res; p += res; } np = true; } return buf; } |
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int xt_check_match(struct xt_mtchk_param *par, |
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unsigned int size, u_int8_t proto, bool inv_proto) |
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{ |
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int ret; |
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if (XT_ALIGN(par->match->matchsize) != size && par->match->matchsize != -1) { |
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/* * ebt_among is exempt from centralized matchsize checking * because it uses a dynamic-size data set. */ |
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pr_err("%s_tables: %s.%u match: invalid size " "%u (kernel) != (user) %u ", |
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xt_prefix[par->family], par->match->name, |
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par->match->revision, |
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XT_ALIGN(par->match->matchsize), size); |
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return -EINVAL; } |
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if (par->match->table != NULL && strcmp(par->match->table, par->table) != 0) { |
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pr_err("%s_tables: %s match: only valid in %s table, not %s ", |
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xt_prefix[par->family], par->match->name, |
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par->match->table, par->table); |
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return -EINVAL; } |
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if (par->match->hooks && (par->hook_mask & ~par->match->hooks) != 0) { |
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char used[64], allow[64]; |
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pr_err("%s_tables: %s match: used from hooks %s, but only " |
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"valid from %s ", |
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xt_prefix[par->family], par->match->name, |
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textify_hooks(used, sizeof(used), par->hook_mask), textify_hooks(allow, sizeof(allow), par->match->hooks)); |
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return -EINVAL; } |
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if (par->match->proto && (par->match->proto != proto || inv_proto)) { |
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pr_err("%s_tables: %s match: only valid for protocol %u ", |
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xt_prefix[par->family], par->match->name, par->match->proto); |
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return -EINVAL; } |
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if (par->match->checkentry != NULL) { ret = par->match->checkentry(par); if (ret < 0) return ret; else if (ret > 0) /* Flag up potential errors. */ return -EIO; } |
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return 0; } EXPORT_SYMBOL_GPL(xt_check_match); |
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#ifdef CONFIG_COMPAT |
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int xt_compat_add_offset(u_int8_t af, unsigned int offset, int delta) |
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{ |
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struct xt_af *xp = &xt[af]; |
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|
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if (!xp->compat_tab) { if (!xp->number) return -EINVAL; xp->compat_tab = vmalloc(sizeof(struct compat_delta) * xp->number); if (!xp->compat_tab) return -ENOMEM; xp->cur = 0; } |
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|
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if (xp->cur >= xp->number) return -EINVAL; |
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|
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if (xp->cur) delta += xp->compat_tab[xp->cur - 1].delta; xp->compat_tab[xp->cur].offset = offset; xp->compat_tab[xp->cur].delta = delta; xp->cur++; |
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return 0; } EXPORT_SYMBOL_GPL(xt_compat_add_offset); |
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void xt_compat_flush_offsets(u_int8_t af) |
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{ |
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if (xt[af].compat_tab) { vfree(xt[af].compat_tab); xt[af].compat_tab = NULL; xt[af].number = 0; |
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xt[af].cur = 0; |
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} } EXPORT_SYMBOL_GPL(xt_compat_flush_offsets); |
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int xt_compat_calc_jump(u_int8_t af, unsigned int offset) |
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{ |
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struct compat_delta *tmp = xt[af].compat_tab; int mid, left = 0, right = xt[af].cur - 1; while (left <= right) { mid = (left + right) >> 1; if (offset > tmp[mid].offset) left = mid + 1; else if (offset < tmp[mid].offset) right = mid - 1; else return mid ? tmp[mid - 1].delta : 0; } |
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return left ? tmp[left - 1].delta : 0; |
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} EXPORT_SYMBOL_GPL(xt_compat_calc_jump); |
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void xt_compat_init_offsets(u_int8_t af, unsigned int number) { xt[af].number = number; xt[af].cur = 0; } EXPORT_SYMBOL(xt_compat_init_offsets); |
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int xt_compat_match_offset(const struct xt_match *match) |
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{ |
9fa492cdc [NETFILTER]: x_ta... |
466 467 468 469 |
u_int16_t csize = match->compatsize ? : match->matchsize; return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize); } EXPORT_SYMBOL_GPL(xt_compat_match_offset); |
895669513 [NETFILTER]: x_ta... |
470 |
int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, |
b0a6363c2 [NETFILTER]: {ip,... |
471 |
unsigned int *size) |
9fa492cdc [NETFILTER]: x_ta... |
472 |
{ |
5452e425a [NETFILTER]: anno... |
473 |
const struct xt_match *match = m->u.kernel.match; |
9fa492cdc [NETFILTER]: x_ta... |
474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 |
struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m; int pad, off = xt_compat_match_offset(match); u_int16_t msize = cm->u.user.match_size; m = *dstptr; memcpy(m, cm, sizeof(*cm)); if (match->compat_from_user) match->compat_from_user(m->data, cm->data); else memcpy(m->data, cm->data, msize - sizeof(*cm)); pad = XT_ALIGN(match->matchsize) - match->matchsize; if (pad > 0) memset(m->data + match->matchsize, 0, pad); msize += off; m->u.user.match_size = msize; *size += off; *dstptr += msize; |
895669513 [NETFILTER]: x_ta... |
493 |
return 0; |
9fa492cdc [NETFILTER]: x_ta... |
494 495 |
} EXPORT_SYMBOL_GPL(xt_compat_match_from_user); |
739674fb7 netfilter: xtable... |
496 497 |
int xt_compat_match_to_user(const struct xt_entry_match *m, void __user **dstptr, unsigned int *size) |
9fa492cdc [NETFILTER]: x_ta... |
498 |
{ |
5452e425a [NETFILTER]: anno... |
499 |
const struct xt_match *match = m->u.kernel.match; |
9fa492cdc [NETFILTER]: x_ta... |
500 501 502 503 504 |
struct compat_xt_entry_match __user *cm = *dstptr; int off = xt_compat_match_offset(match); u_int16_t msize = m->u.user.match_size - off; if (copy_to_user(cm, m, sizeof(*cm)) || |
a18aa31b7 [NETFILTER]: ip_t... |
505 506 507 |
put_user(msize, &cm->u.user.match_size) || copy_to_user(cm->u.user.name, m->u.kernel.match->name, strlen(m->u.kernel.match->name) + 1)) |
601e68e10 [NETFILTER]: Fix ... |
508 |
return -EFAULT; |
9fa492cdc [NETFILTER]: x_ta... |
509 510 511 512 513 514 515 |
if (match->compat_to_user) { if (match->compat_to_user((void __user *)cm->data, m->data)) return -EFAULT; } else { if (copy_to_user(cm->data, m->data, msize - sizeof(*cm))) return -EFAULT; |
2722971cb [NETFILTER]: ipta... |
516 |
} |
9fa492cdc [NETFILTER]: x_ta... |
517 518 519 520 |
*size -= off; *dstptr += msize; return 0; |
2722971cb [NETFILTER]: ipta... |
521 |
} |
9fa492cdc [NETFILTER]: x_ta... |
522 523 |
EXPORT_SYMBOL_GPL(xt_compat_match_to_user); #endif /* CONFIG_COMPAT */ |
2722971cb [NETFILTER]: ipta... |
524 |
|
916a917df netfilter: xtable... |
525 |
int xt_check_target(struct xt_tgchk_param *par, |
af5d6dc20 netfilter: xtable... |
526 |
unsigned int size, u_int8_t proto, bool inv_proto) |
37f9f7334 [NETFILTER]: xt_t... |
527 |
{ |
d6b00a534 netfilter: xtable... |
528 |
int ret; |
af5d6dc20 netfilter: xtable... |
529 |
if (XT_ALIGN(par->target->targetsize) != size) { |
b402405d7 netfilter: xtable... |
530 531 532 |
pr_err("%s_tables: %s.%u target: invalid size " "%u (kernel) != (user) %u ", |
916a917df netfilter: xtable... |
533 |
xt_prefix[par->family], par->target->name, |
b402405d7 netfilter: xtable... |
534 |
par->target->revision, |
af5d6dc20 netfilter: xtable... |
535 |
XT_ALIGN(par->target->targetsize), size); |
37f9f7334 [NETFILTER]: xt_t... |
536 537 |
return -EINVAL; } |
af5d6dc20 netfilter: xtable... |
538 539 |
if (par->target->table != NULL && strcmp(par->target->table, par->table) != 0) { |
3dd5d7e3b x_tables: Convert... |
540 541 |
pr_err("%s_tables: %s target: only valid in %s table, not %s ", |
916a917df netfilter: xtable... |
542 |
xt_prefix[par->family], par->target->name, |
af5d6dc20 netfilter: xtable... |
543 |
par->target->table, par->table); |
37f9f7334 [NETFILTER]: xt_t... |
544 545 |
return -EINVAL; } |
af5d6dc20 netfilter: xtable... |
546 |
if (par->target->hooks && (par->hook_mask & ~par->target->hooks) != 0) { |
451853645 netfilter: xtable... |
547 |
char used[64], allow[64]; |
3dd5d7e3b x_tables: Convert... |
548 |
pr_err("%s_tables: %s target: used from hooks %s, but only " |
451853645 netfilter: xtable... |
549 550 |
"usable from %s ", |
916a917df netfilter: xtable... |
551 |
xt_prefix[par->family], par->target->name, |
451853645 netfilter: xtable... |
552 553 |
textify_hooks(used, sizeof(used), par->hook_mask), textify_hooks(allow, sizeof(allow), par->target->hooks)); |
37f9f7334 [NETFILTER]: xt_t... |
554 555 |
return -EINVAL; } |
af5d6dc20 netfilter: xtable... |
556 |
if (par->target->proto && (par->target->proto != proto || inv_proto)) { |
3dd5d7e3b x_tables: Convert... |
557 558 |
pr_err("%s_tables: %s target: only valid for protocol %u ", |
916a917df netfilter: xtable... |
559 |
xt_prefix[par->family], par->target->name, |
af5d6dc20 netfilter: xtable... |
560 |
par->target->proto); |
37f9f7334 [NETFILTER]: xt_t... |
561 562 |
return -EINVAL; } |
d6b00a534 netfilter: xtable... |
563 564 565 566 567 568 569 570 |
if (par->target->checkentry != NULL) { ret = par->target->checkentry(par); if (ret < 0) return ret; else if (ret > 0) /* Flag up potential errors. */ return -EIO; } |
37f9f7334 [NETFILTER]: xt_t... |
571 572 573 |
return 0; } EXPORT_SYMBOL_GPL(xt_check_target); |
2722971cb [NETFILTER]: ipta... |
574 |
#ifdef CONFIG_COMPAT |
5452e425a [NETFILTER]: anno... |
575 |
int xt_compat_target_offset(const struct xt_target *target) |
2722971cb [NETFILTER]: ipta... |
576 |
{ |
9fa492cdc [NETFILTER]: x_ta... |
577 578 579 580 581 582 |
u_int16_t csize = target->compatsize ? : target->targetsize; return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize); } EXPORT_SYMBOL_GPL(xt_compat_target_offset); void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr, |
b0a6363c2 [NETFILTER]: {ip,... |
583 |
unsigned int *size) |
9fa492cdc [NETFILTER]: x_ta... |
584 |
{ |
5452e425a [NETFILTER]: anno... |
585 |
const struct xt_target *target = t->u.kernel.target; |
9fa492cdc [NETFILTER]: x_ta... |
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 |
struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t; int pad, off = xt_compat_target_offset(target); u_int16_t tsize = ct->u.user.target_size; t = *dstptr; memcpy(t, ct, sizeof(*ct)); if (target->compat_from_user) target->compat_from_user(t->data, ct->data); else memcpy(t->data, ct->data, tsize - sizeof(*ct)); pad = XT_ALIGN(target->targetsize) - target->targetsize; if (pad > 0) memset(t->data + target->targetsize, 0, pad); tsize += off; t->u.user.target_size = tsize; *size += off; *dstptr += tsize; } EXPORT_SYMBOL_GPL(xt_compat_target_from_user); |
739674fb7 netfilter: xtable... |
607 608 |
int xt_compat_target_to_user(const struct xt_entry_target *t, void __user **dstptr, unsigned int *size) |
9fa492cdc [NETFILTER]: x_ta... |
609 |
{ |
5452e425a [NETFILTER]: anno... |
610 |
const struct xt_target *target = t->u.kernel.target; |
9fa492cdc [NETFILTER]: x_ta... |
611 612 613 614 615 |
struct compat_xt_entry_target __user *ct = *dstptr; int off = xt_compat_target_offset(target); u_int16_t tsize = t->u.user.target_size - off; if (copy_to_user(ct, t, sizeof(*ct)) || |
a18aa31b7 [NETFILTER]: ip_t... |
616 617 618 |
put_user(tsize, &ct->u.user.target_size) || copy_to_user(ct->u.user.name, t->u.kernel.target->name, strlen(t->u.kernel.target->name) + 1)) |
601e68e10 [NETFILTER]: Fix ... |
619 |
return -EFAULT; |
9fa492cdc [NETFILTER]: x_ta... |
620 621 622 623 624 625 626 |
if (target->compat_to_user) { if (target->compat_to_user((void __user *)ct->data, t->data)) return -EFAULT; } else { if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct))) return -EFAULT; |
2722971cb [NETFILTER]: ipta... |
627 |
} |
9fa492cdc [NETFILTER]: x_ta... |
628 629 630 631 |
*size -= off; *dstptr += tsize; return 0; |
2722971cb [NETFILTER]: ipta... |
632 |
} |
9fa492cdc [NETFILTER]: x_ta... |
633 |
EXPORT_SYMBOL_GPL(xt_compat_target_to_user); |
2722971cb [NETFILTER]: ipta... |
634 |
#endif |
2e4e6a17a [NETFILTER] x_tab... |
635 636 637 638 639 640 |
struct xt_table_info *xt_alloc_table_info(unsigned int size) { struct xt_table_info *newinfo; int cpu; /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */ |
4481374ce mm: replace vario... |
641 |
if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > totalram_pages) |
2e4e6a17a [NETFILTER] x_tab... |
642 |
return NULL; |
259d4e41f [NETFILTER]: x_ta... |
643 |
newinfo = kzalloc(XT_TABLE_INFO_SZ, GFP_KERNEL); |
2e4e6a17a [NETFILTER] x_tab... |
644 645 646 647 |
if (!newinfo) return NULL; newinfo->size = size; |
6f9120422 [PATCH] for_each_... |
648 |
for_each_possible_cpu(cpu) { |
2e4e6a17a [NETFILTER] x_tab... |
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 |
if (size <= PAGE_SIZE) newinfo->entries[cpu] = kmalloc_node(size, GFP_KERNEL, cpu_to_node(cpu)); else newinfo->entries[cpu] = vmalloc_node(size, cpu_to_node(cpu)); if (newinfo->entries[cpu] == NULL) { xt_free_table_info(newinfo); return NULL; } } return newinfo; } EXPORT_SYMBOL(xt_alloc_table_info); void xt_free_table_info(struct xt_table_info *info) { int cpu; |
6f9120422 [PATCH] for_each_... |
670 |
for_each_possible_cpu(cpu) { |
2e4e6a17a [NETFILTER] x_tab... |
671 672 673 674 675 |
if (info->size <= PAGE_SIZE) kfree(info->entries[cpu]); else vfree(info->entries[cpu]); } |
f3c5c1bfd netfilter: xtable... |
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 |
if (info->jumpstack != NULL) { if (sizeof(void *) * info->stacksize > PAGE_SIZE) { for_each_possible_cpu(cpu) vfree(info->jumpstack[cpu]); } else { for_each_possible_cpu(cpu) kfree(info->jumpstack[cpu]); } } if (sizeof(void **) * nr_cpu_ids > PAGE_SIZE) vfree(info->jumpstack); else kfree(info->jumpstack); |
7489aec8e netfilter: xtable... |
691 692 |
free_percpu(info->stackptr); |
f3c5c1bfd netfilter: xtable... |
693 |
|
2e4e6a17a [NETFILTER] x_tab... |
694 695 696 697 698 |
kfree(info); } EXPORT_SYMBOL(xt_free_table_info); /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */ |
76108cea0 netfilter: Use un... |
699 700 |
struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, const char *name) |
2e4e6a17a [NETFILTER] x_tab... |
701 702 |
{ struct xt_table *t; |
9e19bb6d7 [NETFILTER] x_tab... |
703 |
if (mutex_lock_interruptible(&xt[af].mutex) != 0) |
2e4e6a17a [NETFILTER] x_tab... |
704 |
return ERR_PTR(-EINTR); |
8d8700520 [NETFILTER]: x_ta... |
705 |
list_for_each_entry(t, &net->xt.tables[af], list) |
2e4e6a17a [NETFILTER] x_tab... |
706 707 |
if (strcmp(t->name, name) == 0 && try_module_get(t->me)) return t; |
9e19bb6d7 [NETFILTER] x_tab... |
708 |
mutex_unlock(&xt[af].mutex); |
2e4e6a17a [NETFILTER] x_tab... |
709 710 711 712 713 714 |
return NULL; } EXPORT_SYMBOL_GPL(xt_find_table_lock); void xt_table_unlock(struct xt_table *table) { |
9e19bb6d7 [NETFILTER] x_tab... |
715 |
mutex_unlock(&xt[table->af].mutex); |
2e4e6a17a [NETFILTER] x_tab... |
716 717 |
} EXPORT_SYMBOL_GPL(xt_table_unlock); |
2722971cb [NETFILTER]: ipta... |
718 |
#ifdef CONFIG_COMPAT |
76108cea0 netfilter: Use un... |
719 |
void xt_compat_lock(u_int8_t af) |
2722971cb [NETFILTER]: ipta... |
720 721 722 723 |
{ mutex_lock(&xt[af].compat_mutex); } EXPORT_SYMBOL_GPL(xt_compat_lock); |
76108cea0 netfilter: Use un... |
724 |
void xt_compat_unlock(u_int8_t af) |
2722971cb [NETFILTER]: ipta... |
725 726 727 728 729 |
{ mutex_unlock(&xt[af].compat_mutex); } EXPORT_SYMBOL_GPL(xt_compat_unlock); #endif |
2e4e6a17a [NETFILTER] x_tab... |
730 |
|
7f5c6d4f6 netfilter: get ri... |
731 732 |
DEFINE_PER_CPU(seqcount_t, xt_recseq); EXPORT_PER_CPU_SYMBOL_GPL(xt_recseq); |
942e4a2bd netfilter: revise... |
733 |
|
f3c5c1bfd netfilter: xtable... |
734 735 736 737 |
static int xt_jumpstack_alloc(struct xt_table_info *i) { unsigned int size; int cpu; |
7489aec8e netfilter: xtable... |
738 |
i->stackptr = alloc_percpu(unsigned int); |
f3c5c1bfd netfilter: xtable... |
739 740 |
if (i->stackptr == NULL) return -ENOMEM; |
f3c5c1bfd netfilter: xtable... |
741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 |
size = sizeof(void **) * nr_cpu_ids; if (size > PAGE_SIZE) i->jumpstack = vmalloc(size); else i->jumpstack = kmalloc(size, GFP_KERNEL); if (i->jumpstack == NULL) return -ENOMEM; memset(i->jumpstack, 0, size); i->stacksize *= xt_jumpstack_multiplier; size = sizeof(void *) * i->stacksize; for_each_possible_cpu(cpu) { if (size > PAGE_SIZE) i->jumpstack[cpu] = vmalloc_node(size, cpu_to_node(cpu)); else i->jumpstack[cpu] = kmalloc_node(size, GFP_KERNEL, cpu_to_node(cpu)); if (i->jumpstack[cpu] == NULL) /* * Freeing will be done later on by the callers. The * chain is: xt_replace_table -> __do_replace -> * do_replace -> xt_free_table_info. */ return -ENOMEM; } return 0; } |
942e4a2bd netfilter: revise... |
771 |
|
2e4e6a17a [NETFILTER] x_tab... |
772 773 774 775 776 777 |
struct xt_table_info * xt_replace_table(struct xt_table *table, unsigned int num_counters, struct xt_table_info *newinfo, int *error) { |
942e4a2bd netfilter: revise... |
778 |
struct xt_table_info *private; |
f3c5c1bfd netfilter: xtable... |
779 |
int ret; |
2e4e6a17a [NETFILTER] x_tab... |
780 |
|
d97a9e47b netfilter: x_tabl... |
781 782 783 784 785 |
ret = xt_jumpstack_alloc(newinfo); if (ret < 0) { *error = ret; return NULL; } |
2e4e6a17a [NETFILTER] x_tab... |
786 |
/* Do the substitution. */ |
942e4a2bd netfilter: revise... |
787 |
local_bh_disable(); |
2e4e6a17a [NETFILTER] x_tab... |
788 |
private = table->private; |
942e4a2bd netfilter: revise... |
789 |
|
2e4e6a17a [NETFILTER] x_tab... |
790 791 |
/* Check inside lock: is the old number correct? */ if (num_counters != private->number) { |
be91fd5e3 netfilter: xtable... |
792 793 |
pr_debug("num_counters != table->private->number (%u/%u) ", |
2e4e6a17a [NETFILTER] x_tab... |
794 |
num_counters, private->number); |
942e4a2bd netfilter: revise... |
795 |
local_bh_enable(); |
2e4e6a17a [NETFILTER] x_tab... |
796 797 798 |
*error = -EAGAIN; return NULL; } |
2e4e6a17a [NETFILTER] x_tab... |
799 |
|
942e4a2bd netfilter: revise... |
800 801 802 803 804 805 806 807 808 809 |
table->private = newinfo; newinfo->initial_entries = private->initial_entries; /* * Even though table entries have now been swapped, other CPU's * may still be using the old entries. This is okay, because * resynchronization happens because of the locking done * during the get_counters() routine. */ local_bh_enable(); |
fbabf31e4 netfilter: create... |
810 811 812 813 814 815 816 817 818 819 820 821 822 823 |
#ifdef CONFIG_AUDIT if (audit_enabled) { struct audit_buffer *ab; ab = audit_log_start(current->audit_context, GFP_KERNEL, AUDIT_NETFILTER_CFG); if (ab) { audit_log_format(ab, "table=%s family=%u entries=%u", table->name, table->af, private->number); audit_log_end(ab); } } #endif |
942e4a2bd netfilter: revise... |
824 |
return private; |
2e4e6a17a [NETFILTER] x_tab... |
825 826 |
} EXPORT_SYMBOL_GPL(xt_replace_table); |
35aad0ffd netfilter: xtable... |
827 828 |
struct xt_table *xt_register_table(struct net *net, const struct xt_table *input_table, |
a98da11d8 [NETFILTER]: x_ta... |
829 830 |
struct xt_table_info *bootstrap, struct xt_table_info *newinfo) |
2e4e6a17a [NETFILTER] x_tab... |
831 832 833 |
{ int ret; struct xt_table_info *private; |
35aad0ffd netfilter: xtable... |
834 |
struct xt_table *t, *table; |
2e4e6a17a [NETFILTER] x_tab... |
835 |
|
44d34e721 [NETFILTER]: x_ta... |
836 |
/* Don't add one object to multiple lists. */ |
35aad0ffd netfilter: xtable... |
837 |
table = kmemdup(input_table, sizeof(struct xt_table), GFP_KERNEL); |
44d34e721 [NETFILTER]: x_ta... |
838 839 840 841 |
if (!table) { ret = -ENOMEM; goto out; } |
9e19bb6d7 [NETFILTER] x_tab... |
842 |
ret = mutex_lock_interruptible(&xt[table->af].mutex); |
2e4e6a17a [NETFILTER] x_tab... |
843 |
if (ret != 0) |
44d34e721 [NETFILTER]: x_ta... |
844 |
goto out_free; |
2e4e6a17a [NETFILTER] x_tab... |
845 846 |
/* Don't autoload: we'd eat our tail... */ |
8d8700520 [NETFILTER]: x_ta... |
847 |
list_for_each_entry(t, &net->xt.tables[table->af], list) { |
df0933dcb [NETFILTER]: kill... |
848 849 850 851 |
if (strcmp(t->name, table->name) == 0) { ret = -EEXIST; goto unlock; } |
2e4e6a17a [NETFILTER] x_tab... |
852 853 854 855 |
} /* Simplifies replace_table code. */ table->private = bootstrap; |
784544739 netfilter: iptabl... |
856 |
|
2e4e6a17a [NETFILTER] x_tab... |
857 858 859 860 |
if (!xt_replace_table(table, 0, newinfo, &ret)) goto unlock; private = table->private; |
be91fd5e3 netfilter: xtable... |
861 862 |
pr_debug("table->private->number = %u ", private->number); |
2e4e6a17a [NETFILTER] x_tab... |
863 864 865 |
/* save number of initial entries */ private->initial_entries = private->number; |
8d8700520 [NETFILTER]: x_ta... |
866 |
list_add(&table->list, &net->xt.tables[table->af]); |
a98da11d8 [NETFILTER]: x_ta... |
867 868 |
mutex_unlock(&xt[table->af].mutex); return table; |
2e4e6a17a [NETFILTER] x_tab... |
869 |
|
2e4e6a17a [NETFILTER] x_tab... |
870 |
unlock: |
9e19bb6d7 [NETFILTER] x_tab... |
871 |
mutex_unlock(&xt[table->af].mutex); |
44d34e721 [NETFILTER]: x_ta... |
872 873 |
out_free: kfree(table); |
a98da11d8 [NETFILTER]: x_ta... |
874 875 |
out: return ERR_PTR(ret); |
2e4e6a17a [NETFILTER] x_tab... |
876 877 878 879 880 881 |
} EXPORT_SYMBOL_GPL(xt_register_table); void *xt_unregister_table(struct xt_table *table) { struct xt_table_info *private; |
9e19bb6d7 [NETFILTER] x_tab... |
882 |
mutex_lock(&xt[table->af].mutex); |
2e4e6a17a [NETFILTER] x_tab... |
883 |
private = table->private; |
df0933dcb [NETFILTER]: kill... |
884 |
list_del(&table->list); |
9e19bb6d7 [NETFILTER] x_tab... |
885 |
mutex_unlock(&xt[table->af].mutex); |
44d34e721 [NETFILTER]: x_ta... |
886 |
kfree(table); |
2e4e6a17a [NETFILTER] x_tab... |
887 888 889 890 891 892 |
return private; } EXPORT_SYMBOL_GPL(xt_unregister_table); #ifdef CONFIG_PROC_FS |
715cf35ac [NETFILTER]: x_ta... |
893 894 |
struct xt_names_priv { struct seq_net_private p; |
76108cea0 netfilter: Use un... |
895 |
u_int8_t af; |
715cf35ac [NETFILTER]: x_ta... |
896 |
}; |
025d93d14 [NETFILTER]: x_ta... |
897 |
static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos) |
2e4e6a17a [NETFILTER] x_tab... |
898 |
{ |
715cf35ac [NETFILTER]: x_ta... |
899 |
struct xt_names_priv *priv = seq->private; |
1218854af [NET] NETNS: Omit... |
900 |
struct net *net = seq_file_net(seq); |
76108cea0 netfilter: Use un... |
901 |
u_int8_t af = priv->af; |
2e4e6a17a [NETFILTER] x_tab... |
902 |
|
025d93d14 [NETFILTER]: x_ta... |
903 |
mutex_lock(&xt[af].mutex); |
715cf35ac [NETFILTER]: x_ta... |
904 |
return seq_list_start(&net->xt.tables[af], *pos); |
025d93d14 [NETFILTER]: x_ta... |
905 |
} |
2e4e6a17a [NETFILTER] x_tab... |
906 |
|
025d93d14 [NETFILTER]: x_ta... |
907 908 |
static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos) { |
715cf35ac [NETFILTER]: x_ta... |
909 |
struct xt_names_priv *priv = seq->private; |
1218854af [NET] NETNS: Omit... |
910 |
struct net *net = seq_file_net(seq); |
76108cea0 netfilter: Use un... |
911 |
u_int8_t af = priv->af; |
2e4e6a17a [NETFILTER] x_tab... |
912 |
|
715cf35ac [NETFILTER]: x_ta... |
913 |
return seq_list_next(v, &net->xt.tables[af], pos); |
2e4e6a17a [NETFILTER] x_tab... |
914 |
} |
025d93d14 [NETFILTER]: x_ta... |
915 |
static void xt_table_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17a [NETFILTER] x_tab... |
916 |
{ |
715cf35ac [NETFILTER]: x_ta... |
917 |
struct xt_names_priv *priv = seq->private; |
76108cea0 netfilter: Use un... |
918 |
u_int8_t af = priv->af; |
2e4e6a17a [NETFILTER] x_tab... |
919 |
|
025d93d14 [NETFILTER]: x_ta... |
920 921 |
mutex_unlock(&xt[af].mutex); } |
2e4e6a17a [NETFILTER] x_tab... |
922 |
|
025d93d14 [NETFILTER]: x_ta... |
923 924 925 |
static int xt_table_seq_show(struct seq_file *seq, void *v) { struct xt_table *table = list_entry(v, struct xt_table, list); |
2e4e6a17a [NETFILTER] x_tab... |
926 |
|
025d93d14 [NETFILTER]: x_ta... |
927 928 929 930 931 932 |
if (strlen(table->name)) return seq_printf(seq, "%s ", table->name); else return 0; } |
601e68e10 [NETFILTER]: Fix ... |
933 |
|
025d93d14 [NETFILTER]: x_ta... |
934 935 936 937 938 939 940 941 942 943 |
static const struct seq_operations xt_table_seq_ops = { .start = xt_table_seq_start, .next = xt_table_seq_next, .stop = xt_table_seq_stop, .show = xt_table_seq_show, }; static int xt_table_open(struct inode *inode, struct file *file) { int ret; |
715cf35ac [NETFILTER]: x_ta... |
944 |
struct xt_names_priv *priv; |
025d93d14 [NETFILTER]: x_ta... |
945 |
|
715cf35ac [NETFILTER]: x_ta... |
946 947 |
ret = seq_open_net(inode, file, &xt_table_seq_ops, sizeof(struct xt_names_priv)); |
025d93d14 [NETFILTER]: x_ta... |
948 |
if (!ret) { |
715cf35ac [NETFILTER]: x_ta... |
949 950 |
priv = ((struct seq_file *)file->private_data)->private; priv->af = (unsigned long)PDE(inode)->data; |
025d93d14 [NETFILTER]: x_ta... |
951 952 |
} return ret; |
2e4e6a17a [NETFILTER] x_tab... |
953 |
} |
025d93d14 [NETFILTER]: x_ta... |
954 955 956 957 958 |
static const struct file_operations xt_table_ops = { .owner = THIS_MODULE, .open = xt_table_open, .read = seq_read, .llseek = seq_lseek, |
0e93bb945 netfilter: x_tabl... |
959 |
.release = seq_release_net, |
025d93d14 [NETFILTER]: x_ta... |
960 |
}; |
eb132205c netfilter: make p... |
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 |
/* * Traverse state for ip{,6}_{tables,matches} for helping crossing * the multi-AF mutexes. */ struct nf_mttg_trav { struct list_head *head, *curr; uint8_t class, nfproto; }; enum { MTTG_TRAV_INIT, MTTG_TRAV_NFP_UNSPEC, MTTG_TRAV_NFP_SPEC, MTTG_TRAV_DONE, }; static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos, bool is_target) |
2e4e6a17a [NETFILTER] x_tab... |
979 |
{ |
eb132205c netfilter: make p... |
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 |
static const uint8_t next_class[] = { [MTTG_TRAV_NFP_UNSPEC] = MTTG_TRAV_NFP_SPEC, [MTTG_TRAV_NFP_SPEC] = MTTG_TRAV_DONE, }; struct nf_mttg_trav *trav = seq->private; switch (trav->class) { case MTTG_TRAV_INIT: trav->class = MTTG_TRAV_NFP_UNSPEC; mutex_lock(&xt[NFPROTO_UNSPEC].mutex); trav->head = trav->curr = is_target ? &xt[NFPROTO_UNSPEC].target : &xt[NFPROTO_UNSPEC].match; break; case MTTG_TRAV_NFP_UNSPEC: trav->curr = trav->curr->next; if (trav->curr != trav->head) break; mutex_unlock(&xt[NFPROTO_UNSPEC].mutex); mutex_lock(&xt[trav->nfproto].mutex); trav->head = trav->curr = is_target ? &xt[trav->nfproto].target : &xt[trav->nfproto].match; trav->class = next_class[trav->class]; break; case MTTG_TRAV_NFP_SPEC: trav->curr = trav->curr->next; if (trav->curr != trav->head) break; /* fallthru, _stop will unlock */ default: return NULL; } |
2e4e6a17a [NETFILTER] x_tab... |
1011 |
|
eb132205c netfilter: make p... |
1012 1013 1014 |
if (ppos != NULL) ++*ppos; return trav; |
025d93d14 [NETFILTER]: x_ta... |
1015 |
} |
601e68e10 [NETFILTER]: Fix ... |
1016 |
|
eb132205c netfilter: make p... |
1017 1018 |
static void *xt_mttg_seq_start(struct seq_file *seq, loff_t *pos, bool is_target) |
025d93d14 [NETFILTER]: x_ta... |
1019 |
{ |
eb132205c netfilter: make p... |
1020 1021 |
struct nf_mttg_trav *trav = seq->private; unsigned int j; |
2e4e6a17a [NETFILTER] x_tab... |
1022 |
|
eb132205c netfilter: make p... |
1023 1024 1025 1026 1027 |
trav->class = MTTG_TRAV_INIT; for (j = 0; j < *pos; ++j) if (xt_mttg_seq_next(seq, NULL, NULL, is_target) == NULL) return NULL; return trav; |
2e4e6a17a [NETFILTER] x_tab... |
1028 |
} |
eb132205c netfilter: make p... |
1029 |
static void xt_mttg_seq_stop(struct seq_file *seq, void *v) |
2e4e6a17a [NETFILTER] x_tab... |
1030 |
{ |
eb132205c netfilter: make p... |
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 |
struct nf_mttg_trav *trav = seq->private; switch (trav->class) { case MTTG_TRAV_NFP_UNSPEC: mutex_unlock(&xt[NFPROTO_UNSPEC].mutex); break; case MTTG_TRAV_NFP_SPEC: mutex_unlock(&xt[trav->nfproto].mutex); break; } } |
2e4e6a17a [NETFILTER] x_tab... |
1042 |
|
eb132205c netfilter: make p... |
1043 1044 1045 |
static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos) { return xt_mttg_seq_start(seq, pos, false); |
2e4e6a17a [NETFILTER] x_tab... |
1046 |
} |
eb132205c netfilter: make p... |
1047 |
static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *ppos) |
2e4e6a17a [NETFILTER] x_tab... |
1048 |
{ |
eb132205c netfilter: make p... |
1049 1050 |
return xt_mttg_seq_next(seq, v, ppos, false); } |
2e4e6a17a [NETFILTER] x_tab... |
1051 |
|
eb132205c netfilter: make p... |
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 |
static int xt_match_seq_show(struct seq_file *seq, void *v) { const struct nf_mttg_trav *trav = seq->private; const struct xt_match *match; switch (trav->class) { case MTTG_TRAV_NFP_UNSPEC: case MTTG_TRAV_NFP_SPEC: if (trav->curr == trav->head) return 0; match = list_entry(trav->curr, struct xt_match, list); return (*match->name == '\0') ? 0 : seq_printf(seq, "%s ", match->name); } return 0; |
2e4e6a17a [NETFILTER] x_tab... |
1068 |
} |
025d93d14 [NETFILTER]: x_ta... |
1069 1070 1071 |
static const struct seq_operations xt_match_seq_ops = { .start = xt_match_seq_start, .next = xt_match_seq_next, |
eb132205c netfilter: make p... |
1072 |
.stop = xt_mttg_seq_stop, |
025d93d14 [NETFILTER]: x_ta... |
1073 |
.show = xt_match_seq_show, |
2e4e6a17a [NETFILTER] x_tab... |
1074 |
}; |
025d93d14 [NETFILTER]: x_ta... |
1075 |
static int xt_match_open(struct inode *inode, struct file *file) |
2e4e6a17a [NETFILTER] x_tab... |
1076 |
{ |
eb132205c netfilter: make p... |
1077 1078 |
struct seq_file *seq; struct nf_mttg_trav *trav; |
2e4e6a17a [NETFILTER] x_tab... |
1079 |
int ret; |
eb132205c netfilter: make p... |
1080 1081 1082 |
trav = kmalloc(sizeof(*trav), GFP_KERNEL); if (trav == NULL) return -ENOMEM; |
2e4e6a17a [NETFILTER] x_tab... |
1083 |
|
eb132205c netfilter: make p... |
1084 1085 1086 1087 |
ret = seq_open(file, &xt_match_seq_ops); if (ret < 0) { kfree(trav); return ret; |
2e4e6a17a [NETFILTER] x_tab... |
1088 |
} |
eb132205c netfilter: make p... |
1089 1090 1091 1092 1093 |
seq = file->private_data; seq->private = trav; trav->nfproto = (unsigned long)PDE(inode)->data; return 0; |
025d93d14 [NETFILTER]: x_ta... |
1094 1095 1096 1097 1098 1099 1100 |
} static const struct file_operations xt_match_ops = { .owner = THIS_MODULE, .open = xt_match_open, .read = seq_read, .llseek = seq_lseek, |
eb132205c netfilter: make p... |
1101 |
.release = seq_release_private, |
025d93d14 [NETFILTER]: x_ta... |
1102 |
}; |
2e4e6a17a [NETFILTER] x_tab... |
1103 |
|
025d93d14 [NETFILTER]: x_ta... |
1104 1105 |
static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos) { |
eb132205c netfilter: make p... |
1106 |
return xt_mttg_seq_start(seq, pos, true); |
025d93d14 [NETFILTER]: x_ta... |
1107 |
} |
eb132205c netfilter: make p... |
1108 |
static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *ppos) |
025d93d14 [NETFILTER]: x_ta... |
1109 |
{ |
eb132205c netfilter: make p... |
1110 |
return xt_mttg_seq_next(seq, v, ppos, true); |
025d93d14 [NETFILTER]: x_ta... |
1111 1112 1113 1114 |
} static int xt_target_seq_show(struct seq_file *seq, void *v) { |
eb132205c netfilter: make p... |
1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 |
const struct nf_mttg_trav *trav = seq->private; const struct xt_target *target; switch (trav->class) { case MTTG_TRAV_NFP_UNSPEC: case MTTG_TRAV_NFP_SPEC: if (trav->curr == trav->head) return 0; target = list_entry(trav->curr, struct xt_target, list); return (*target->name == '\0') ? 0 : seq_printf(seq, "%s ", target->name); } return 0; |
025d93d14 [NETFILTER]: x_ta... |
1129 1130 1131 1132 1133 |
} static const struct seq_operations xt_target_seq_ops = { .start = xt_target_seq_start, .next = xt_target_seq_next, |
eb132205c netfilter: make p... |
1134 |
.stop = xt_mttg_seq_stop, |
025d93d14 [NETFILTER]: x_ta... |
1135 1136 1137 1138 1139 |
.show = xt_target_seq_show, }; static int xt_target_open(struct inode *inode, struct file *file) { |
eb132205c netfilter: make p... |
1140 1141 |
struct seq_file *seq; struct nf_mttg_trav *trav; |
025d93d14 [NETFILTER]: x_ta... |
1142 |
int ret; |
eb132205c netfilter: make p... |
1143 1144 1145 |
trav = kmalloc(sizeof(*trav), GFP_KERNEL); if (trav == NULL) return -ENOMEM; |
025d93d14 [NETFILTER]: x_ta... |
1146 |
|
eb132205c netfilter: make p... |
1147 1148 1149 1150 |
ret = seq_open(file, &xt_target_seq_ops); if (ret < 0) { kfree(trav); return ret; |
025d93d14 [NETFILTER]: x_ta... |
1151 |
} |
eb132205c netfilter: make p... |
1152 1153 1154 1155 1156 |
seq = file->private_data; seq->private = trav; trav->nfproto = (unsigned long)PDE(inode)->data; return 0; |
2e4e6a17a [NETFILTER] x_tab... |
1157 |
} |
025d93d14 [NETFILTER]: x_ta... |
1158 |
static const struct file_operations xt_target_ops = { |
2e4e6a17a [NETFILTER] x_tab... |
1159 |
.owner = THIS_MODULE, |
025d93d14 [NETFILTER]: x_ta... |
1160 |
.open = xt_target_open, |
2e4e6a17a [NETFILTER] x_tab... |
1161 1162 |
.read = seq_read, .llseek = seq_lseek, |
eb132205c netfilter: make p... |
1163 |
.release = seq_release_private, |
2e4e6a17a [NETFILTER] x_tab... |
1164 1165 1166 1167 1168 1169 1170 |
}; #define FORMAT_TABLES "_tables_names" #define FORMAT_MATCHES "_tables_matches" #define FORMAT_TARGETS "_tables_targets" #endif /* CONFIG_PROC_FS */ |
2b95efe7f netfilter: xtable... |
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 |
/** * xt_hook_link - set up hooks for a new table * @table: table with metadata needed to set up hooks * @fn: Hook function * * This function will take care of creating and registering the necessary * Netfilter hooks for XT tables. */ struct nf_hook_ops *xt_hook_link(const struct xt_table *table, nf_hookfn *fn) { unsigned int hook_mask = table->valid_hooks; uint8_t i, num_hooks = hweight32(hook_mask); uint8_t hooknum; struct nf_hook_ops *ops; int ret; ops = kmalloc(sizeof(*ops) * num_hooks, GFP_KERNEL); if (ops == NULL) return ERR_PTR(-ENOMEM); for (i = 0, hooknum = 0; i < num_hooks && hook_mask != 0; hook_mask >>= 1, ++hooknum) { if (!(hook_mask & 1)) continue; ops[i].hook = fn; ops[i].owner = table->me; ops[i].pf = table->af; ops[i].hooknum = hooknum; ops[i].priority = table->priority; ++i; } ret = nf_register_hooks(ops, num_hooks); if (ret < 0) { kfree(ops); return ERR_PTR(ret); } return ops; } EXPORT_SYMBOL_GPL(xt_hook_link); /** * xt_hook_unlink - remove hooks for a table * @ops: nf_hook_ops array as returned by nf_hook_link * @hook_mask: the very same mask that was passed to nf_hook_link */ void xt_hook_unlink(const struct xt_table *table, struct nf_hook_ops *ops) { nf_unregister_hooks(ops, hweight32(table->valid_hooks)); kfree(ops); } EXPORT_SYMBOL_GPL(xt_hook_unlink); |
76108cea0 netfilter: Use un... |
1224 |
int xt_proto_init(struct net *net, u_int8_t af) |
2e4e6a17a [NETFILTER] x_tab... |
1225 1226 1227 1228 1229 |
{ #ifdef CONFIG_PROC_FS char buf[XT_FUNCTION_MAXNAMELEN]; struct proc_dir_entry *proc; #endif |
7e9c6eeb1 netfilter: Introd... |
1230 |
if (af >= ARRAY_SIZE(xt_prefix)) |
2e4e6a17a [NETFILTER] x_tab... |
1231 1232 1233 1234 |
return -EINVAL; #ifdef CONFIG_PROC_FS |
ce18afe57 [NETFILTER]: x_ta... |
1235 |
strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17a [NETFILTER] x_tab... |
1236 |
strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
8b169240e netfilter: assign... |
1237 1238 |
proc = proc_create_data(buf, 0440, net->proc_net, &xt_table_ops, (void *)(unsigned long)af); |
2e4e6a17a [NETFILTER] x_tab... |
1239 1240 |
if (!proc) goto out; |
2e4e6a17a [NETFILTER] x_tab... |
1241 |
|
ce18afe57 [NETFILTER]: x_ta... |
1242 |
strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17a [NETFILTER] x_tab... |
1243 |
strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
8b169240e netfilter: assign... |
1244 1245 |
proc = proc_create_data(buf, 0440, net->proc_net, &xt_match_ops, (void *)(unsigned long)af); |
2e4e6a17a [NETFILTER] x_tab... |
1246 1247 |
if (!proc) goto out_remove_tables; |
2e4e6a17a [NETFILTER] x_tab... |
1248 |
|
ce18afe57 [NETFILTER]: x_ta... |
1249 |
strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17a [NETFILTER] x_tab... |
1250 |
strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
8b169240e netfilter: assign... |
1251 1252 |
proc = proc_create_data(buf, 0440, net->proc_net, &xt_target_ops, (void *)(unsigned long)af); |
2e4e6a17a [NETFILTER] x_tab... |
1253 1254 |
if (!proc) goto out_remove_matches; |
2e4e6a17a [NETFILTER] x_tab... |
1255 1256 1257 1258 1259 1260 |
#endif return 0; #ifdef CONFIG_PROC_FS out_remove_matches: |
ce18afe57 [NETFILTER]: x_ta... |
1261 |
strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17a [NETFILTER] x_tab... |
1262 |
strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d57 [NETFILTER]: x_ta... |
1263 |
proc_net_remove(net, buf); |
2e4e6a17a [NETFILTER] x_tab... |
1264 1265 |
out_remove_tables: |
ce18afe57 [NETFILTER]: x_ta... |
1266 |
strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17a [NETFILTER] x_tab... |
1267 |
strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d57 [NETFILTER]: x_ta... |
1268 |
proc_net_remove(net, buf); |
2e4e6a17a [NETFILTER] x_tab... |
1269 1270 1271 1272 1273 |
out: return -1; #endif } EXPORT_SYMBOL_GPL(xt_proto_init); |
76108cea0 netfilter: Use un... |
1274 |
void xt_proto_fini(struct net *net, u_int8_t af) |
2e4e6a17a [NETFILTER] x_tab... |
1275 1276 1277 |
{ #ifdef CONFIG_PROC_FS char buf[XT_FUNCTION_MAXNAMELEN]; |
ce18afe57 [NETFILTER]: x_ta... |
1278 |
strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17a [NETFILTER] x_tab... |
1279 |
strlcat(buf, FORMAT_TABLES, sizeof(buf)); |
3cb609d57 [NETFILTER]: x_ta... |
1280 |
proc_net_remove(net, buf); |
2e4e6a17a [NETFILTER] x_tab... |
1281 |
|
ce18afe57 [NETFILTER]: x_ta... |
1282 |
strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17a [NETFILTER] x_tab... |
1283 |
strlcat(buf, FORMAT_TARGETS, sizeof(buf)); |
3cb609d57 [NETFILTER]: x_ta... |
1284 |
proc_net_remove(net, buf); |
2e4e6a17a [NETFILTER] x_tab... |
1285 |
|
ce18afe57 [NETFILTER]: x_ta... |
1286 |
strlcpy(buf, xt_prefix[af], sizeof(buf)); |
2e4e6a17a [NETFILTER] x_tab... |
1287 |
strlcat(buf, FORMAT_MATCHES, sizeof(buf)); |
3cb609d57 [NETFILTER]: x_ta... |
1288 |
proc_net_remove(net, buf); |
2e4e6a17a [NETFILTER] x_tab... |
1289 1290 1291 |
#endif /*CONFIG_PROC_FS*/ } EXPORT_SYMBOL_GPL(xt_proto_fini); |
8d8700520 [NETFILTER]: x_ta... |
1292 1293 1294 |
static int __net_init xt_net_init(struct net *net) { int i; |
7e9c6eeb1 netfilter: Introd... |
1295 |
for (i = 0; i < NFPROTO_NUMPROTO; i++) |
8d8700520 [NETFILTER]: x_ta... |
1296 1297 1298 1299 1300 1301 1302 |
INIT_LIST_HEAD(&net->xt.tables[i]); return 0; } static struct pernet_operations xt_net_ops = { .init = xt_net_init, }; |
2e4e6a17a [NETFILTER] x_tab... |
1303 1304 1305 |
static int __init xt_init(void) { |
942e4a2bd netfilter: revise... |
1306 1307 1308 1309 |
unsigned int i; int rv; for_each_possible_cpu(i) { |
7f5c6d4f6 netfilter: get ri... |
1310 |
seqcount_init(&per_cpu(xt_recseq, i)); |
942e4a2bd netfilter: revise... |
1311 |
} |
2e4e6a17a [NETFILTER] x_tab... |
1312 |
|
7e9c6eeb1 netfilter: Introd... |
1313 |
xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL); |
2e4e6a17a [NETFILTER] x_tab... |
1314 1315 |
if (!xt) return -ENOMEM; |
7e9c6eeb1 netfilter: Introd... |
1316 |
for (i = 0; i < NFPROTO_NUMPROTO; i++) { |
9e19bb6d7 [NETFILTER] x_tab... |
1317 |
mutex_init(&xt[i].mutex); |
2722971cb [NETFILTER]: ipta... |
1318 1319 |
#ifdef CONFIG_COMPAT mutex_init(&xt[i].compat_mutex); |
255d0dc34 netfilter: x_tabl... |
1320 |
xt[i].compat_tab = NULL; |
2722971cb [NETFILTER]: ipta... |
1321 |
#endif |
2e4e6a17a [NETFILTER] x_tab... |
1322 1323 |
INIT_LIST_HEAD(&xt[i].target); INIT_LIST_HEAD(&xt[i].match); |
2e4e6a17a [NETFILTER] x_tab... |
1324 |
} |
8d8700520 [NETFILTER]: x_ta... |
1325 1326 1327 1328 |
rv = register_pernet_subsys(&xt_net_ops); if (rv < 0) kfree(xt); return rv; |
2e4e6a17a [NETFILTER] x_tab... |
1329 1330 1331 1332 |
} static void __exit xt_fini(void) { |
8d8700520 [NETFILTER]: x_ta... |
1333 |
unregister_pernet_subsys(&xt_net_ops); |
2e4e6a17a [NETFILTER] x_tab... |
1334 1335 1336 1337 1338 |
kfree(xt); } module_init(xt_init); module_exit(xt_fini); |