diff options
Diffstat (limited to 'net/bridge/netfilter/ebtables.c')
-rw-r--r-- | net/bridge/netfilter/ebtables.c | 94 |
1 files changed, 54 insertions, 40 deletions
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index 0b7f262..4370e96 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -82,7 +82,8 @@ static inline int ebt_do_match (struct ebt_entry_match *m, return m->u.match->match(skb, par) ? EBT_MATCH : EBT_NOMATCH; } -static inline int ebt_dev_check(char *entry, const struct net_device *device) +static inline int +ebt_dev_check(const char *entry, const struct net_device *device) { int i = 0; const char *devname; @@ -100,8 +101,9 @@ static inline int ebt_dev_check(char *entry, const struct net_device *device) #define FWINV2(bool,invflg) ((bool) ^ !!(e->invflags & invflg)) /* process standard matches */ -static inline int ebt_basic_match(struct ebt_entry *e, struct ethhdr *h, - const struct net_device *in, const struct net_device *out) +static inline int +ebt_basic_match(const struct ebt_entry *e, const struct ethhdr *h, + const struct net_device *in, const struct net_device *out) { int verdict, i; @@ -156,12 +158,12 @@ unsigned int ebt_do_table (unsigned int hook, struct sk_buff *skb, int i, nentries; struct ebt_entry *point; struct ebt_counter *counter_base, *cb_base; - struct ebt_entry_target *t; + const struct ebt_entry_target *t; int verdict, sp = 0; struct ebt_chainstack *cs; struct ebt_entries *chaininfo; - char *base; - struct ebt_table_info *private; + const char *base; + const struct ebt_table_info *private; bool hotdrop = false; struct xt_match_param mtpar; struct xt_target_param tgpar; @@ -395,7 +397,7 @@ ebt_check_watcher(struct ebt_entry_watcher *w, struct xt_tgchk_param *par, return 0; } -static int ebt_verify_pointers(struct ebt_replace *repl, +static int ebt_verify_pointers(const struct ebt_replace *repl, struct ebt_table_info *newinfo) { unsigned int limit = repl->entries_size; @@ -442,6 +444,8 @@ static int ebt_verify_pointers(struct ebt_replace *repl, break; if (left < e->next_offset) break; + if (e->next_offset < sizeof(struct ebt_entry)) + return -EINVAL; offset += e->next_offset; } } @@ -466,8 +470,8 @@ static int ebt_verify_pointers(struct ebt_replace *repl, * to parse the userspace data */ static inline int -ebt_check_entry_size_and_hooks(struct ebt_entry *e, - struct ebt_table_info *newinfo, +ebt_check_entry_size_and_hooks(const struct ebt_entry *e, + const struct ebt_table_info *newinfo, unsigned int *n, unsigned int *cnt, unsigned int *totalcnt, unsigned int *udc_cnt) { @@ -561,13 +565,14 @@ ebt_get_udc_positions(struct ebt_entry *e, struct ebt_table_info *newinfo, } static inline int -ebt_cleanup_match(struct ebt_entry_match *m, unsigned int *i) +ebt_cleanup_match(struct ebt_entry_match *m, struct net *net, unsigned int *i) { struct xt_mtdtor_param par; if (i && (*i)-- == 0) return 1; + par.net = net; par.match = m->u.match; par.matchinfo = m->data; par.family = NFPROTO_BRIDGE; @@ -578,13 +583,14 @@ ebt_cleanup_match(struct ebt_entry_match *m, unsigned int *i) } static inline int -ebt_cleanup_watcher(struct ebt_entry_watcher *w, unsigned int *i) +ebt_cleanup_watcher(struct ebt_entry_watcher *w, struct net *net, unsigned int *i) { struct xt_tgdtor_param par; if (i && (*i)-- == 0) return 1; + par.net = net; par.target = w->u.watcher; par.targinfo = w->data; par.family = NFPROTO_BRIDGE; @@ -595,7 +601,7 @@ ebt_cleanup_watcher(struct ebt_entry_watcher *w, unsigned int *i) } static inline int -ebt_cleanup_entry(struct ebt_entry *e, unsigned int *cnt) +ebt_cleanup_entry(struct ebt_entry *e, struct net *net, unsigned int *cnt) { struct xt_tgdtor_param par; struct ebt_entry_target *t; @@ -605,10 +611,11 @@ ebt_cleanup_entry(struct ebt_entry *e, unsigned int *cnt) /* we're done */ if (cnt && (*cnt)-- == 0) return 1; - EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, NULL); - EBT_MATCH_ITERATE(e, ebt_cleanup_match, NULL); + EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, net, NULL); + EBT_MATCH_ITERATE(e, ebt_cleanup_match, net, NULL); t = (struct ebt_entry_target *)(((char *)e) + e->target_offset); + par.net = net; par.target = t->u.target; par.targinfo = t->data; par.family = NFPROTO_BRIDGE; @@ -619,7 +626,8 @@ ebt_cleanup_entry(struct ebt_entry *e, unsigned int *cnt) } static inline int -ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo, +ebt_check_entry(struct ebt_entry *e, struct net *net, + const struct ebt_table_info *newinfo, const char *name, unsigned int *cnt, struct ebt_cl_stack *cl_s, unsigned int udc_cnt) { @@ -671,6 +679,7 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo, } i = 0; + mtpar.net = tgpar.net = net; mtpar.table = tgpar.table = name; mtpar.entryinfo = tgpar.entryinfo = e; mtpar.hook_mask = tgpar.hook_mask = hookmask; @@ -726,9 +735,9 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo, (*cnt)++; return 0; cleanup_watchers: - EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, &j); + EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, net, &j); cleanup_matches: - EBT_MATCH_ITERATE(e, ebt_cleanup_match, &i); + EBT_MATCH_ITERATE(e, ebt_cleanup_match, net, &i); return ret; } @@ -737,12 +746,12 @@ cleanup_matches: * the hook mask for udc tells us from which base chains the udc can be * accessed. This mask is a parameter to the check() functions of the extensions */ -static int check_chainloops(struct ebt_entries *chain, struct ebt_cl_stack *cl_s, +static int check_chainloops(const struct ebt_entries *chain, struct ebt_cl_stack *cl_s, unsigned int udc_cnt, unsigned int hooknr, char *base) { int i, chain_nr = -1, pos = 0, nentries = chain->nentries, verdict; - struct ebt_entry *e = (struct ebt_entry *)chain->data; - struct ebt_entry_target *t; + const struct ebt_entry *e = (struct ebt_entry *)chain->data; + const struct ebt_entry_target *t; while (pos < nentries || chain_nr != -1) { /* end of udc, go back one 'recursion' step */ @@ -808,7 +817,8 @@ letscontinue: } /* do the parsing of the table/chains/entries/matches/watchers/targets, heh */ -static int translate_table(char *name, struct ebt_table_info *newinfo) +static int translate_table(struct net *net, const char *name, + struct ebt_table_info *newinfo) { unsigned int i, j, k, udc_cnt; int ret; @@ -917,17 +927,17 @@ static int translate_table(char *name, struct ebt_table_info *newinfo) /* used to know what we need to clean up if something goes wrong */ i = 0; ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, - ebt_check_entry, newinfo, name, &i, cl_s, udc_cnt); + ebt_check_entry, net, newinfo, name, &i, cl_s, udc_cnt); if (ret != 0) { EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, - ebt_cleanup_entry, &i); + ebt_cleanup_entry, net, &i); } vfree(cl_s); return ret; } /* called under write_lock */ -static void get_counters(struct ebt_counter *oldcounters, +static void get_counters(const struct ebt_counter *oldcounters, struct ebt_counter *counters, unsigned int nentries) { int i, cpu; @@ -950,7 +960,8 @@ static void get_counters(struct ebt_counter *oldcounters, } /* replace the table */ -static int do_replace(struct net *net, void __user *user, unsigned int len) +static int do_replace(struct net *net, const void __user *user, + unsigned int len) { int ret, i, countersize; struct ebt_table_info *newinfo; @@ -1017,7 +1028,7 @@ static int do_replace(struct net *net, void __user *user, unsigned int len) if (ret != 0) goto free_counterstmp; - ret = translate_table(tmp.name, newinfo); + ret = translate_table(net, tmp.name, newinfo); if (ret != 0) goto free_counterstmp; @@ -1070,7 +1081,7 @@ static int do_replace(struct net *net, void __user *user, unsigned int len) /* decrease module count and free resources */ EBT_ENTRY_ITERATE(table->entries, table->entries_size, - ebt_cleanup_entry, NULL); + ebt_cleanup_entry, net, NULL); vfree(table->entries); if (table->chainstack) { @@ -1087,7 +1098,7 @@ free_unlock: mutex_unlock(&ebt_mutex); free_iterate: EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size, - ebt_cleanup_entry, NULL); + ebt_cleanup_entry, net, NULL); free_counterstmp: vfree(counterstmp); /* can be initialized in translate_table() */ @@ -1154,7 +1165,7 @@ ebt_register_table(struct net *net, const struct ebt_table *input_table) newinfo->hook_entry[i] = p + ((char *)repl->hook_entry[i] - repl->entries); } - ret = translate_table(repl->name, newinfo); + ret = translate_table(net, repl->name, newinfo); if (ret != 0) { BUGPRINT("Translate_table failed\n"); goto free_chainstack; @@ -1204,7 +1215,7 @@ out: return ERR_PTR(ret); } -void ebt_unregister_table(struct ebt_table *table) +void ebt_unregister_table(struct net *net, struct ebt_table *table) { int i; @@ -1216,7 +1227,7 @@ void ebt_unregister_table(struct ebt_table *table) list_del(&table->list); mutex_unlock(&ebt_mutex); EBT_ENTRY_ITERATE(table->private->entries, table->private->entries_size, - ebt_cleanup_entry, NULL); + ebt_cleanup_entry, net, NULL); if (table->private->nentries) module_put(table->me); vfree(table->private->entries); @@ -1230,7 +1241,8 @@ void ebt_unregister_table(struct ebt_table *table) } /* userspace just supplied us with counters */ -static int update_counters(struct net *net, void __user *user, unsigned int len) +static int update_counters(struct net *net, const void __user *user, + unsigned int len) { int i, ret; struct ebt_counter *tmp; @@ -1285,8 +1297,8 @@ free_tmp: return ret; } -static inline int ebt_make_matchname(struct ebt_entry_match *m, - char *base, char __user *ubase) +static inline int ebt_make_matchname(const struct ebt_entry_match *m, + const char *base, char __user *ubase) { char __user *hlp = ubase + ((char *)m - base); if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN)) @@ -1294,8 +1306,8 @@ static inline int ebt_make_matchname(struct ebt_entry_match *m, return 0; } -static inline int ebt_make_watchername(struct ebt_entry_watcher *w, - char *base, char __user *ubase) +static inline int ebt_make_watchername(const struct ebt_entry_watcher *w, + const char *base, char __user *ubase) { char __user *hlp = ubase + ((char *)w - base); if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN)) @@ -1303,11 +1315,12 @@ static inline int ebt_make_watchername(struct ebt_entry_watcher *w, return 0; } -static inline int ebt_make_names(struct ebt_entry *e, char *base, char __user *ubase) +static inline int +ebt_make_names(struct ebt_entry *e, const char *base, char __user *ubase) { int ret; char __user *hlp; - struct ebt_entry_target *t; + const struct ebt_entry_target *t; if (e->bitmask == 0) return 0; @@ -1328,10 +1341,11 @@ static inline int ebt_make_names(struct ebt_entry *e, char *base, char __user *u /* called with ebt_mutex locked */ static int copy_everything_to_user(struct ebt_table *t, void __user *user, - int *len, int cmd) + const int *len, int cmd) { struct ebt_replace tmp; - struct ebt_counter *counterstmp, *oldcounters; + struct ebt_counter *counterstmp; + const struct ebt_counter *oldcounters; unsigned int entries_size, nentries; char *entries; |