diff options
Diffstat (limited to 'net/ipv4/netfilter/ip_tables.c')
| -rw-r--r-- | net/ipv4/netfilter/ip_tables.c | 1138 |
1 files changed, 1007 insertions, 131 deletions
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index 460fd905fad03e..d5b8cdd361ce87 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -24,6 +24,7 @@ #include <linux/module.h> #include <linux/icmp.h> #include <net/ip.h> +#include <net/compat.h> #include <asm/uaccess.h> #include <linux/mutex.h> #include <linux/proc_fs.h> @@ -799,17 +800,11 @@ get_counters(const struct xt_table_info *t, } } -static int -copy_entries_to_user(unsigned int total_size, - struct ipt_table *table, - void __user *userptr) +static inline struct xt_counters * alloc_counters(struct ipt_table *table) { - unsigned int off, num, countersize; - struct ipt_entry *e; + unsigned int countersize; struct xt_counters *counters; struct xt_table_info *private = table->private; - int ret = 0; - void *loc_cpu_entry; /* We need atomic snapshot of counters: rest doesn't change (other than comefrom, which userspace doesn't care @@ -818,13 +813,32 @@ copy_entries_to_user(unsigned int total_size, counters = vmalloc_node(countersize, numa_node_id()); if (counters == NULL) - return -ENOMEM; + return ERR_PTR(-ENOMEM); /* First, sum counters... */ write_lock_bh(&table->lock); get_counters(private, counters); write_unlock_bh(&table->lock); + return counters; +} + +static int +copy_entries_to_user(unsigned int total_size, + struct ipt_table *table, + void __user *userptr) +{ + unsigned int off, num; + struct ipt_entry *e; + struct xt_counters *counters; + struct xt_table_info *private = table->private; + int ret = 0; + void *loc_cpu_entry; + + counters = alloc_counters(table); + if (IS_ERR(counters)) + return PTR_ERR(counters); + /* choose the copy that is on our node/cpu, ... * This choice is lazy (because current thread is * allowed to migrate to another cpu) @@ -884,25 +898,278 @@ copy_entries_to_user(unsigned int total_size, return ret; } +#ifdef CONFIG_COMPAT +struct compat_delta { + struct compat_delta *next; + u_int16_t offset; + short delta; +}; + +static struct compat_delta *compat_offsets = NULL; + +static int compat_add_offset(u_int16_t offset, short delta) +{ + struct compat_delta *tmp; + + tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL); + if (!tmp) + return -ENOMEM; + tmp->offset = offset; + tmp->delta = delta; + if (compat_offsets) { + tmp->next = compat_offsets->next; + compat_offsets->next = tmp; + } else { + compat_offsets = tmp; + tmp->next = NULL; + } + return 0; +} + +static void compat_flush_offsets(void) +{ + struct compat_delta *tmp, *next; + + if (compat_offsets) { + for(tmp = compat_offsets; tmp; tmp = next) { + next = tmp->next; + kfree(tmp); + } + compat_offsets = NULL; + } +} + +static short compat_calc_jump(u_int16_t offset) +{ + struct compat_delta *tmp; + short delta; + + for(tmp = compat_offsets, delta = 0; tmp; tmp = tmp->next) + if (tmp->offset < offset) + delta += tmp->delta; + return delta; +} + +struct compat_ipt_standard_target +{ + struct compat_xt_entry_target target; + compat_int_t verdict; +}; + +#define IPT_ST_OFFSET (sizeof(struct ipt_standard_target) - \ + sizeof(struct compat_ipt_standard_target)) + +struct compat_ipt_standard +{ + struct compat_ipt_entry entry; + struct compat_ipt_standard_target target; +}; + +static int compat_ipt_standard_fn(void *target, + void **dstptr, int *size, int convert) +{ + struct compat_ipt_standard_target compat_st, *pcompat_st; + struct ipt_standard_target st, *pst; + int ret; + + ret = 0; + switch (convert) { + case COMPAT_TO_USER: + pst = (struct ipt_standard_target *)target; + memcpy(&compat_st.target, &pst->target, + sizeof(struct ipt_entry_target)); + compat_st.verdict = pst->verdict; + if (compat_st.verdict > 0) + compat_st.verdict -= + compat_calc_jump(compat_st.verdict); + compat_st.target.u.user.target_size = + sizeof(struct compat_ipt_standard_target); + if (__copy_to_user(*dstptr, &compat_st, + sizeof(struct compat_ipt_standard_target))) + ret = -EFAULT; + *size -= IPT_ST_OFFSET; + *dstptr += sizeof(struct compat_ipt_standard_target); + break; + case COMPAT_FROM_USER: + pcompat_st = + (struct compat_ipt_standard_target *)target; + memcpy(&st.target, &pcompat_st->target, + sizeof(struct ipt_entry_target)); + st.verdict = pcompat_st->verdict; + if (st.verdict > 0) + st.verdict += compat_calc_jump(st.verdict); + st.target.u.user.target_size = + sizeof(struct ipt_standard_target); + memcpy(*dstptr, &st, + sizeof(struct ipt_standard_target)); + *size += IPT_ST_OFFSET; + *dstptr += sizeof(struct ipt_standard_target); + break; + case COMPAT_CALC_SIZE: + *size += IPT_ST_OFFSET; + break; + default: + ret = -ENOPROTOOPT; + break; + } + return ret; +} + +static inline int +compat_calc_match(struct ipt_entry_match *m, int * size) +{ + if (m->u.kernel.match->compat) + m->u.kernel.match->compat(m, NULL, size, COMPAT_CALC_SIZE); + else + xt_compat_match(m, NULL, size, COMPAT_CALC_SIZE); + return 0; +} + +static int compat_calc_entry(struct ipt_entry *e, struct xt_table_info *info, + void *base, struct xt_table_info *newinfo) +{ + struct ipt_entry_target *t; + u_int16_t entry_offset; + int off, i, ret; + + off = 0; + entry_offset = (void *)e - base; + IPT_MATCH_ITERATE(e, compat_calc_match, &off); + t = ipt_get_target(e); + if (t->u.kernel.target->compat) + t->u.kernel.target->compat(t, NULL, &off, COMPAT_CALC_SIZE); + else + xt_compat_target(t, NULL, &off, COMPAT_CALC_SIZE); + newinfo->size -= off; + ret = compat_add_offset(entry_offset, off); + if (ret) + return ret; + + for (i = 0; i< NF_IP_NUMHOOKS; i++) { + if (info->hook_entry[i] && (e < (struct ipt_entry *) + (base + info->hook_entry[i]))) + newinfo->hook_entry[i] -= off; + if (info->underflow[i] && (e < (struct ipt_entry *) + (base + info->underflow[i]))) + newinfo->underflow[i] -= off; + } + return 0; +} + +static int compat_table_info(struct xt_table_info *info, + struct xt_table_info *newinfo) +{ + void *loc_cpu_entry; + int i; + + if (!newinfo || !info) + return -EINVAL; + + memset(newinfo, 0, sizeof(struct xt_table_info)); + newinfo->size = info->size; + newinfo->number = info->number; + for (i = 0; i < NF_IP_NUMHOOKS; i++) { + newinfo->hook_entry[i] = info->hook_entry[i]; + newinfo->underflow[i] = info->underflow[i]; + } + loc_cpu_entry = info->entries[raw_smp_processor_id()]; + return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size, + compat_calc_entry, info, loc_cpu_entry, newinfo); +} +#endif + +static int get_info(void __user *user, int *len, int compat) +{ + char name[IPT_TABLE_MAXNAMELEN]; + struct ipt_table *t; + int ret; + + if (*len != sizeof(struct ipt_getinfo)) { + duprintf("length %u != %u\n", *len, + (unsigned int)sizeof(struct ipt_getinfo)); + return -EINVAL; + } + + if (copy_from_user(name, user, sizeof(name)) != 0) + return -EFAULT; + + name[IPT_TABLE_MAXNAMELEN-1] = '\0'; +#ifdef CONFIG_COMPAT + if (compat) + xt_compat_lock(AF_INET); +#endif + t = try_then_request_module(xt_find_table_lock(AF_INET, name), + "iptable_%s", name); + if (t && !IS_ERR(t)) { + struct ipt_getinfo info; + struct xt_table_info *private = t->private; + +#ifdef CONFIG_COMPAT + if (compat) { + struct xt_table_info tmp; + ret = compat_table_info(private, &tmp); + compat_flush_offsets(); + private = &tmp; + } +#endif + info.valid_hooks = t->valid_hooks; + memcpy(info.hook_entry, private->hook_entry, + sizeof(info.hook_entry)); + memcpy(info.underflow, private->underflow, + sizeof(info.underflow)); + info.num_entries = private->number; + info.size = private->size; + strcpy(info.name, name); + + if (copy_to_user(user, &info, *len) != 0) + ret = -EFAULT; + else + ret = 0; + + xt_table_unlock(t); + module_put(t->me); + } else + ret = t ? PTR_ERR(t) : -ENOENT; +#ifdef CONFIG_COMPAT + if (compat) + xt_compat_unlock(AF_INET); +#endif + return ret; +} + static int -get_entries(const struct ipt_get_entries *entries, - struct ipt_get_entries __user *uptr) +get_entries(struct ipt_get_entries __user *uptr, int *len) { int ret; + struct ipt_get_entries get; struct ipt_table *t; - t = xt_find_table_lock(AF_INET, entries->name); + if (*len < sizeof(get)) { + duprintf("get_entries: %u < %d\n", *len, + (unsigned int)sizeof(get)); + return -EINVAL; + } + if (copy_from_user(&get, uptr, sizeof(get)) != 0) + return -EFAULT; + if (*len != sizeof(struct ipt_get_entries) + get.size) { + duprintf("get_entries: %u != %u\n", *len, + (unsigned int)(sizeof(struct ipt_get_entries) + + get.size)); + return -EINVAL; + } + + t = xt_find_table_lock(AF_INET, get.name); if (t && !IS_ERR(t)) { struct xt_table_info *private = t->private; duprintf("t->private->number = %u\n", private->number); - if (entries->size == private->size) + if (get.size == private->size) ret = copy_entries_to_user(private->size, t, uptr->entrytable); else { duprintf("get_entries: I've got %u not %u!\n", private->size, - entries->size); + get.size); ret = -EINVAL; } module_put(t->me); @@ -914,79 +1181,47 @@ get_entries(const struct ipt_get_entries *entries, } static int -do_replace(void __user *user, unsigned int len) +__do_replace(const char *name, unsigned int valid_hooks, + struct xt_table_info *newinfo, unsigned int num_counters, + void __user *counters_ptr) { int ret; - struct ipt_replace tmp; struct ipt_table *t; - struct xt_table_info *newinfo, *oldinfo; + struct xt_table_info *oldinfo; struct xt_counters *counters; - void *loc_cpu_entry, *loc_cpu_old_entry; + void *loc_cpu_old_entry; - if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) - return -EFAULT; - - /* Hack: Causes ipchains to give correct error msg --RR */ - if (len != sizeof(tmp) + tmp.size) - return -ENOPROTOOPT; - - /* overflow check */ - if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - - SMP_CACHE_BYTES) - return -ENOMEM; - if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) - return -ENOMEM; - - newinfo = xt_alloc_table_info(tmp.size); - if (!newinfo) - return -ENOMEM; - - /* choose the copy that is our node/cpu */ - loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; - if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), - tmp.size) != 0) { - ret = -EFAULT; - goto free_newinfo; - } - - counters = vmalloc(tmp.num_counters * sizeof(struct xt_counters)); + ret = 0; + counters = vmalloc(num_counters * sizeof(struct xt_counters)); if (!counters) { ret = -ENOMEM; - goto free_newinfo; + goto out; } - ret = translate_table(tmp.name, tmp.valid_hooks, - newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, - tmp.hook_entry, tmp.underflow); - if (ret != 0) - goto free_newinfo_counters; - - duprintf("ip_tables: Translated table\n"); - - t = try_then_request_module(xt_find_table_lock(AF_INET, tmp.name), - "iptable_%s", tmp.name); + t = try_then_request_module(xt_find_table_lock(AF_INET, name), + "iptable_%s", name); if (!t || IS_ERR(t)) { ret = t ? PTR_ERR(t) : -ENOENT; goto free_newinfo_counters_untrans; } /* You lied! */ - if (tmp.valid_hooks != t->valid_hooks) { + if (valid_hooks != t->valid_hooks) { duprintf("Valid hook crap: %08X vs %08X\n", - tmp.valid_hooks, t->valid_hooks); + valid_hooks, t->valid_hooks); ret = -EINVAL; goto put_module; } - oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret); + oldinfo = xt_replace_table(t, num_counters, newinfo, &ret); if (!oldinfo) goto put_module; /* Update module usage count based on number of rules */ duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n", oldinfo->number, oldinfo->initial_entries, newinfo->number); - if ((oldinfo->number > oldinfo->initial_entries) || - (newinfo->number <= oldinfo->initial_entries)) + if ((oldinfo->number > oldinfo->initial_entries) || + (newinfo->number <= oldinfo->initial_entries)) module_put(t->me); if ((oldinfo->number > oldinfo->initial_entries) && (newinfo->number <= oldinfo->initial_entries)) @@ -998,8 +1233,8 @@ do_replace(void __user *user, unsigned int len) loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()]; IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL); xt_free_table_info(oldinfo); - if (copy_to_user(tmp.counters, counters, - sizeof(struct xt_counters) * tmp.num_counters) != 0) + if (copy_to_user(counters_ptr, counters, + sizeof(struct xt_counters) * num_counters) != 0) ret = -EFAULT; vfree(counters); xt_table_unlock(t); @@ -1009,9 +1244,62 @@ do_replace(void __user *user, unsigned int len) module_put(t->me); xt_table_unlock(t); free_newinfo_counters_untrans: - IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); - free_newinfo_counters: vfree(counters); + out: + return ret; +} + +static int +do_replace(void __user *user, unsigned int len) +{ + int ret; + struct ipt_replace tmp; + struct xt_table_info *newinfo; + void *loc_cpu_entry; + + if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) + return -EFAULT; + + /* Hack: Causes ipchains to give correct error msg --RR */ + if (len != sizeof(tmp) + tmp.size) + return -ENOPROTOOPT; + + /* overflow check */ + if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - + SMP_CACHE_BYTES) + return -ENOMEM; + if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) + return -ENOMEM; + + newinfo = xt_alloc_table_info(tmp.size); + if (!newinfo) + return -ENOMEM; + + /* choose the copy that is our node/cpu */ + loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; + if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), + tmp.size) != 0) { + ret = -EFAULT; + goto free_newinfo; + } + + ret = translate_table(tmp.name, tmp.valid_hooks, + newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, + tmp.hook_entry, tmp.underflow); + if (ret != 0) + goto free_newinfo; + + duprintf("ip_tables: Translated table\n"); + + ret = __do_replace(tmp.name, tmp.valid_hooks, + newinfo, tmp.num_counters, + tmp.counters); + if (ret) + goto free_newinfo_untrans; + return 0; + + free_newinfo_untrans: + IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); free_newinfo: xt_free_table_info(newinfo); return ret; @@ -1040,31 +1328,59 @@ add_counter_to_entry(struct ipt_entry *e, } static int -do_add_counters(void __user *user, unsigned int len) +do_add_counters(void __user *user, unsigned int len, int compat) { unsigned int i; - struct xt_counters_info tmp, *paddc; + struct xt_counters_info tmp; + struct xt_counters *paddc; + unsigned int num_counters; + char *name; + int size; + void *ptmp; struct ipt_table *t; struct xt_table_info *private; int ret = 0; void *loc_cpu_entry; +#ifdef CONFIG_COMPAT + struct compat_xt_counters_info compat_tmp; - if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) + if (compat) { + ptmp = &compat_tmp; + size = sizeof(struct compat_xt_counters_info); + } else +#endif + { + ptmp = &tmp; + size = sizeof(struct xt_counters_info); + } + + if (copy_from_user(ptmp, user, size) != 0) return -EFAULT; - if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters)) +#ifdef CONFIG_COMPAT + if (compat) { + num_counters = compat_tmp.num_counters; + name = compat_tmp.name; + } else +#endif + { + num_counters = tmp.num_counters; + name = tmp.name; + } + + if (len != size + num_counters * sizeof(struct xt_counters)) return -EINVAL; - paddc = vmalloc_node(len, numa_node_id()); + paddc = vmalloc_node(len - size, numa_node_id()); if (!paddc) return -ENOMEM; - if (copy_from_user(paddc, user, len) != 0) { + if (copy_from_user(paddc, user + size, len - size) != 0) { ret = -EFAULT; goto free; } - t = xt_find_table_lock(AF_INET, tmp.name); + t = xt_find_table_lock(AF_INET, name); if (!t || IS_ERR(t)) { ret = t ? PTR_ERR(t) : -ENOENT; goto free; @@ -1072,7 +1388,7 @@ do_add_counters(void __user *user, unsigned int len) write_lock_bh(&t->lock); private = t->private; - if (private->number != paddc->num_counters) { + if (private->number != num_counters) { ret = -EINVAL; goto unlock_up_free; } @@ -1083,7 +1399,7 @@ do_add_counters(void __user *user, unsigned int len) IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, add_counter_to_entry, - paddc->counters, + paddc, &i); unlock_up_free: write_unlock_bh(&t->lock); @@ -1095,8 +1411,438 @@ do_add_counters(void __user *user, unsigned int len) return ret; } +#ifdef CONFIG_COMPAT +struct compat_ipt_replace { + char name[IPT_TABLE_MAXNAMELEN]; + u32 valid_hooks; + u32 num_entries; + u32 size; + u32 hook_entry[NF_IP_NUMHOOKS]; + u32 underflow[NF_IP_NUMHOOKS]; + u32 num_counters; + compat_uptr_t counters; /* struct ipt_counters * */ + struct compat_ipt_entry entries[0]; +}; + +static inline int compat_copy_match_to_user(struct ipt_entry_match *m, + void __user **dstptr, compat_uint_t *size) +{ + if (m->u.kernel.match->compat) + return m->u.kernel.match->compat(m, dstptr, size, + COMPAT_TO_USER); + else + return xt_compat_match(m, dstptr, size, COMPAT_TO_USER); +} + +static int compat_copy_entry_to_user(struct ipt_entry *e, + void __user **dstptr, compat_uint_t *size) +{ + struct ipt_entry_target __user *t; + struct compat_ipt_entry __user *ce; + u_int16_t target_offset, next_offset; + compat_uint_t origsize; + int ret; + + ret = -EFAULT; + origsize = *size; + ce = (struct compat_ipt_entry __user *)*dstptr; + if (__copy_to_user(ce, e, sizeof(struct ipt_entry))) + goto out; + + *dstptr += sizeof(struct compat_ipt_entry); + ret = IPT_MATCH_ITERATE(e, compat_copy_match_to_user, dstptr, size); + target_offset = e->target_offset - (origsize - *size); + if (ret) + goto out; + t = ipt_get_target(e); + if (t->u.kernel.target->compat) + ret = t->u.kernel.target->compat(t, dstptr, size, + COMPAT_TO_USER); + else + ret = xt_compat_target(t, dstptr, size, COMPAT_TO_USER); + if (ret) + goto out; + ret = -EFAULT; + next_offset = e->next_offset - (origsize - *size); + if (__put_user(target_offset, &ce->target_offset)) + goto out; + if (__put_user(next_offset, &ce->next_offset)) + goto out; + return 0; +out: + return ret; +} + +static inline int +compat_check_calc_match(struct ipt_entry_match *m, + const char *name, + const struct ipt_ip *ip, + unsigned int hookmask, + int *size, int *i) +{ + struct ipt_match *match; + + match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name, + m->u.user.revision), + "ipt_%s", m->u.user.name); + if (IS_ERR(match) || !match) { + duprintf("compat_check_calc_match: `%s' not found\n", + m->u.user.name); + return match ? PTR_ERR(match) : -ENOENT; + } + m->u.kernel.match = match; + + if (m->u.kernel.match->compat) + m->u.kernel.match->compat(m, NULL, size, COMPAT_CALC_SIZE); + else + xt_compat_match(m, NULL, size, COMPAT_CALC_SIZE); + + (*i)++; + return 0; +} + +static inline int +check_compat_entry_size_and_hooks(struct ipt_entry *e, + struct xt_table_info *newinfo, + unsigned int *size, + unsigned char *base, + unsigned char *limit, + unsigned int *hook_entries, + unsigned int *underflows, + unsigned int *i, + const char *name) +{ + struct ipt_entry_target *t; + struct ipt_target *target; + u_int16_t entry_offset; + int ret, off, h, j; + + duprintf("check_compat_entry_size_and_hooks %p\n", e); + if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 + || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) { + duprintf("Bad offset %p, limit = %p\n", e, limit); + return -EINVAL; + } + + if (e->next_offset < sizeof(struct compat_ipt_entry) + + sizeof(struct compat_xt_entry_target)) { + duprintf("checking: element %p size %u\n", + e, e->next_offset); + return -EINVAL; + } + + if (!ip_checkentry(&e->ip)) { + duprintf("ip_tables: ip check failed %p %s.\n", e, name); + return -EINVAL; + } + + off = 0; + entry_offset = (void *)e - (void *)base; + j = 0; + ret = IPT_MATCH_ITERATE(e, compat_check_calc_match, name, &e->ip, + e->comefrom, &off, &j); + if (ret != 0) + goto out; + + t = ipt_get_target(e); + target = try_then_request_module(xt_find_target(AF_INET, + t->u.user.name, + t->u.user.revision), + "ipt_%s", t->u.user.name); + if (IS_ERR(target) || !target) { + duprintf("check_entry: `%s' not found\n", t->u.user.name); + ret = target ? PTR_ERR(target) : -ENOENT; + goto out; + } + t->u.kernel.target = target; + + if (t->u.kernel.target->compat) + t->u.kernel.target->compat(t, NULL, &off, COMPAT_CALC_SIZE); + else + xt_compat_target(t, NULL, &off, COMPAT_CALC_SIZE); + *size += off; + ret = compat_add_offset(entry_offset, off); + if (ret) + goto out; + + /* Check hooks & underflows */ + for (h = 0; h < NF_IP_NUMHOOKS; h++) { + if ((unsigned char *)e - base == hook_entries[h]) + newinfo->hook_entry[h] = hook_entries[h]; + if ((unsigned char *)e - base == underflows[h]) + newinfo->underflow[h] = underflows[h]; + } + + /* Clear counters and comefrom */ + e->counters = ((struct ipt_counters) { 0, 0 }); + e->comefrom = 0; + + (*i)++; + return 0; +out: + IPT_MATCH_ITERATE(e, cleanup_match, &j); + return ret; +} + +static inline int compat_copy_match_from_user(struct ipt_entry_match *m, + void **dstptr, compat_uint_t *size, const char *name, + const struct ipt_ip *ip, unsigned int hookmask) +{ + struct ipt_entry_match *dm; + struct ipt_match *match; + int ret; + + dm = (struct ipt_entry_match *)*dstptr; + match = m->u.kernel.match; + if (match->compat) + match->compat(m, dstptr, size, COMPAT_FROM_USER); + else + xt_compat_match(m, dstptr, size, COMPAT_FROM_USER); + + ret = xt_check_match(match, AF_INET, dm->u.match_size - sizeof(*dm), + name, hookmask, ip->proto, + ip->invflags & IPT_INV_PROTO); + if (ret) + return ret; + + if (m->u.kernel.match->checkentry + && !m->u.kernel.match->checkentry(name, ip, match, dm->data, + dm->u.match_size - sizeof(*dm), + hookmask)) { + duprintf("ip_tables: check failed for `%s'.\n", + m->u.kernel.match->name); + return -EINVAL; + } + return 0; +} + +static int compat_copy_entry_from_user(struct ipt_entry *e, void **dstptr, + unsigned int *size, const char *name, + struct xt_table_info *newinfo, unsigned char *base) +{ + struct ipt_entry_target *t; + struct ipt_target *target; + struct ipt_entry *de; + unsigned int origsize; + int ret, h; + + ret = 0; + origsize = *size; + de = (struct ipt_entry *)*dstptr; + memcpy(de, e, sizeof(struct ipt_entry)); + + *dstptr += sizeof(struct compat_ipt_entry); + ret = IPT_MATCH_ITERATE(e, compat_copy_match_from_user, dstptr, size, + name, &de->ip, de->comefrom); + if (ret) + goto out; + de->target_offset = e->target_offset - (origsize - *size); + t = ipt_get_target(e); + target = t->u.kernel.target; + if (target->compat) + target->compat(t, dstptr, size, COMPAT_FROM_USER); + else + xt_compat_target(t, dstptr, size, COMPAT_FROM_USER); + + de->next_offset = e->next_offset - (origsize - *size); + for (h = 0; h < NF_IP_NUMHOOKS; h++) { + if ((unsigned char *)de - base < newinfo->hook_entry[h]) + newinfo->hook_entry[h] -= origsize - *size; + if ((unsigned char *)de - base < newinfo->underflow[h]) + newinfo->underflow[h] -= origsize - *size; + } + + t = ipt_get_target(de); + target = t->u.kernel.target; + ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), + name, e->comefrom, e->ip.proto, + e->ip.invflags & IPT_INV_PROTO); + if (ret) + goto out; + + ret = -EINVAL; + if (t->u.kernel.target == &ipt_standard_target) { + if (!standard_check(t, *size)) + goto out; + } else if (t->u.kernel.target->checkentry + && !t->u.kernel.target->checkentry(name, de, target, + t->data, t->u.target_size - sizeof(*t), + de->comefrom)) { + duprintf("ip_tables: compat: check failed for `%s'.\n", + t->u.kernel.target->name); + goto out; + } + ret = 0; +out: + return ret; +} + static int -do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) +translate_compat_table(const char *name, + unsigned int valid_hooks, + struct xt_table_info **pinfo, + void **pentry0, + unsigned int total_size, + unsigned int number, + unsigned int *hook_entries, + unsigned int *underflows) +{ + unsigned int i; + struct xt_table_info *newinfo, *info; + void *pos, *entry0, *entry1; + unsigned int size; + int ret; + + info = *pinfo; + entry0 = *pentry0; + size = total_size; + info->number = number; + + /* Init all hooks to impossible value. */ + for (i = 0; i < NF_IP_NUMHOOKS; i++) { + info->hook_entry[i] = 0xFFFFFFFF; + info->underflow[i] = 0xFFFFFFFF; + } + + duprintf("translate_compat_table: size %u\n", info->size); + i = 0; + xt_compat_lock(AF_INET); + /* Walk through entries, checking offsets. */ + ret = IPT_ENTRY_ITERATE(entry0, total_size, + check_compat_entry_size_and_hooks, + info, &size, entry0, + entry0 + total_size, + hook_entries, underflows, &i, name); + if (ret != 0) + goto out_unlock; + + ret = -EINVAL; + if (i != number) { + duprintf("translate_compat_table: %u not %u entries\n", + i, number); + goto out_unlock; + } + + /* Check hooks all assigned */ + for (i = 0; i < NF_IP_NUMHOOKS; i++) { + /* Only hooks which are valid */ + if (!(valid_hooks & (1 << i))) + continue; + if (info->hook_entry[i] == 0xFFFFFFFF) { + duprintf("Invalid hook entry %u %u\n", + i, hook_entries[i]); + goto out_unlock; + } + if (info->underflow[i] == 0xFFFFFFFF) { + duprintf("Invalid underflow %u %u\n", + i, underflows[i]); + goto out_unlock; + } + } + + ret = -ENOMEM; + newinfo = xt_alloc_table_info(size); + if (!newinfo) + goto out_unlock; + + newinfo->number = number; + for (i = 0; i < NF_IP_NUMHOOKS; i++) { + newinfo->hook_entry[i] = info->hook_entry[i]; + newinfo->underflow[i] = info->underflow[i]; + } + entry1 = newinfo->entries[raw_smp_processor_id()]; + pos = entry1; + size = total_size; + ret = IPT_ENTRY_ITERATE(entry0, total_size, + compat_copy_entry_from_user, &pos, &size, + name, newinfo, entry1); + compat_flush_offsets(); + xt_compat_unlock(AF_INET); + if (ret) + goto free_newinfo; + + ret = -ELOOP; + if (!mark_source_chains(newinfo, valid_hooks, entry1)) + goto free_newinfo; + + /* And one copy for every other CPU */ + for_each_cpu(i) + if (newinfo->entries[i] && newinfo->entries[i] != entry1) + memcpy(newinfo->entries[i], entry1, newinfo->size); + + *pinfo = newinfo; + *pentry0 = entry1; + xt_free_table_info(info); + return 0; + +free_newinfo: + xt_free_table_info(newinfo); +out: + return ret; +out_unlock: + xt_compat_unlock(AF_INET); + goto out; +} + +static int +compat_do_replace(void __user *user, unsigned int len) +{ + int ret; + struct compat_ipt_replace tmp; + struct xt_table_info *newinfo; + void *loc_cpu_entry; + + if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) + return -EFAULT; + + /* Hack: Causes ipchains to give correct error msg --RR */ + if (len != sizeof(tmp) + tmp.size) + return -ENOPROTOOPT; + + /* overflow check */ + if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS - + SMP_CACHE_BYTES) + return -ENOMEM; + if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) + return -ENOMEM; + + newinfo = xt_alloc_table_info(tmp.size); + if (!newinfo) + return -ENOMEM; + + /* choose the copy that is our node/cpu */ + loc_cpu_entry = newinfo->entries[raw_smp_processor_id()]; + if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), + tmp.size) != 0) { + ret = -EFAULT; + goto free_newinfo; + } + + ret = translate_compat_table(tmp.name, tmp.valid_hooks, + &newinfo, &loc_cpu_entry, tmp.size, + tmp.num_entries, tmp.hook_entry, tmp.underflow); + if (ret != 0) + goto free_newinfo; + + duprintf("compat_do_replace: Translated table\n"); + + ret = __do_replace(tmp.name, tmp.valid_hooks, + newinfo, tmp.num_counters, + compat_ptr(tmp.counters)); + if (ret) + goto free_newinfo_untrans; + return 0; + + free_newinfo_untrans: + IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL); + free_newinfo: + xt_free_table_info(newinfo); + return ret; +} + +static int +compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, + unsigned int len) { int ret; @@ -1105,11 +1851,11 @@ do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) switch (cmd) { case IPT_SO_SET_REPLACE: - ret = do_replace(user, len); + ret = compat_do_replace(user, len); break; case IPT_SO_SET_ADD_COUNTERS: - ret = do_add_counters(user, len); + ret = do_add_counters(user, len, 1); break; default: @@ -1120,75 +1866,196 @@ do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) return ret; } +struct compat_ipt_get_entries +{ + char name[IPT_TABLE_MAXNAMELEN]; + compat_uint_t size; + struct compat_ipt_entry entrytable[0]; +}; + +static int compat_copy_entries_to_user(unsigned int total_size, + struct ipt_table *table, void __user *userptr) +{ + unsigned int off, num; + struct compat_ipt_entry e; + struct xt_counters *counters; + struct xt_table_info *private = table->private; + void __user *pos; + unsigned int size; + int ret = 0; + void *loc_cpu_entry; + + counters = alloc_counters(table); + if (IS_ERR(counters)) + return PTR_ERR(counters); + + /* choose the copy that is on our node/cpu, ... + * This choice is lazy (because current thread is + * allowed to migrate to another cpu) + */ + loc_cpu_entry = private->entries[raw_smp_processor_id()]; + pos = userptr; + size = total_size; + ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size, + compat_copy_entry_to_user, &pos, &size); + if (ret) + goto free_counters; + + /* ... then go back and fix counters and names */ + for (off = 0, num = 0; off < size; off += e.next_offset, num++) { + unsigned int i; + struct ipt_entry_match m; + struct ipt_entry_target t; + + ret = -EFAULT; + if (copy_from_user(&e, userptr + off, + sizeof(struct compat_ipt_entry))) + goto free_counters; + if (copy_to_user(userptr + off + + offsetof(struct compat_ipt_entry, counters), + &counters[num], sizeof(counters[num]))) + goto free_counters; + + for (i = sizeof(struct compat_ipt_entry); + i < e.target_offset; i += m.u.match_size) { + if (copy_from_user(&m, userptr + off + i, + sizeof(struct ipt_entry_match))) + goto free_counters; + if (copy_to_user(userptr + off + i + + offsetof(struct ipt_entry_match, u.user.name), + m.u.kernel.match->name, + strlen(m.u.kernel.match->name) + 1)) + goto free_counters; + } + + if (copy_from_user(&t, userptr + off + e.target_offset, + sizeof(struct ipt_entry_target))) + goto free_counters; + if (copy_to_user(userptr + off + e.target_offset + + offsetof(struct ipt_entry_target, u.user.name), + t.u.kernel.target->name, + strlen(t.u.kernel.target->name) + 1)) + goto free_counters; + } + ret = 0; +free_counters: + vfree(counters); + return ret; +} + static int -do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) +compat_get_entries(struct compat_ipt_get_entries __user *uptr, int *len) { int ret; + struct compat_ipt_get_entries get; + struct ipt_table *t; - if (!capable(CAP_NET_ADMIN)) - return -EPERM; - switch (cmd) { - case IPT_SO_GET_INFO: { - char name[IPT_TABLE_MAXNAMELEN]; - struct ipt_table *t; + if (*len < sizeof(get)) { + duprintf("compat_get_entries: %u < %u\n", + *len, (unsigned int)sizeof(get)); + return -EINVAL; + } + + if (copy_from_user(&get, uptr, sizeof(get)) != 0) + return -EFAULT; + + if (*len != sizeof(struct compat_ipt_get_entries) + get.size) { + duprintf("compat_get_entries: %u != %u\n", *len, + (unsigned int)(sizeof(struct compat_ipt_get_entries) + + get.size)); + return -EINVAL; + } - if (*len != sizeof(struct ipt_getinfo)) { - duprintf("length %u != %u\n", *len, - sizeof(struct ipt_getinfo)); + xt_compat_lock(AF_INET); + t = xt_find_table_lock(AF_INET, get.name); + if (t && !IS_ERR(t)) { + struct xt_table_info *private = t->private; + struct xt_table_info info; + duprintf("t->private->number = %u\n", + private->number); + ret = compat_table_info(private, &info); + if (!ret && get.size == info.size) { + ret = compat_copy_entries_to_user(private->size, + t, uptr->entrytable); + } else if (!ret) { + duprintf("compat_get_entries: I've got %u not %u!\n", + private->size, + get.size); ret = -EINVAL; - break; } + compat_flush_offsets(); + module_put(t->me); + xt_table_unlock(t); + } else + ret = t ? PTR_ERR(t) : -ENOENT; - if (copy_from_user(name, user, sizeof(name)) != 0) { - ret = -EFAULT; - break; - } - name[IPT_TABLE_MAXNAMELEN-1] = '\0'; - - t = try_then_request_module(xt_find_table_lock(AF_INET, name), - "iptable_%s", name); - if (t && !IS_ERR(t)) { - struct ipt_getinfo info; - struct xt_table_info *private = t->private; - - info.valid_hooks = t->valid_hooks; - memcpy(info.hook_entry, private->hook_entry, - sizeof(info.hook_entry)); - memcpy(info.underflow, private->underflow, - sizeof(info.underflow)); - info.num_entries = private->number; - info.size = private->size; - memcpy(info.name, name, sizeof(info.name)); - - if (copy_to_user(user, &info, *len) != 0) - ret = -EFAULT; - else - ret = 0; - xt_table_unlock(t); - module_put(t->me); - } else - ret = t ? PTR_ERR(t) : -ENOENT; + xt_compat_unlock(AF_INET); + return ret; +} + +static int +compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) +{ + int ret; + + switch (cmd) { + case IPT_SO_GET_INFO: + ret = get_info(user, len, 1); + break; + case IPT_SO_GET_ENTRIES: + ret = compat_get_entries(user, len); + break; + default: + duprintf("compat_do_ipt_get_ctl: unknown request %i\n", cmd); + ret = -EINVAL; } - break; + return ret; +} +#endif - case IPT_SO_GET_ENTRIES: { - struct ipt_get_entries get; +static int +do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) +{ + int ret; - if (*len < sizeof(get)) { - duprintf("get_entries: %u < %u\n", *len, sizeof(get)); - ret = -EINVAL; - } else if (copy_from_user(&get, user, sizeof(get)) != 0) { - ret = -EFAULT; - } else if (*len != sizeof(struct ipt_get_entries) + get.size) { - duprintf("get_entries: %u != %u\n", *len, - sizeof(struct ipt_get_entries) + get.size); - ret = -EINVAL; - } else - ret = get_entries(&get, user); + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + switch (cmd) { + case IPT_SO_SET_REPLACE: + ret = do_replace(user, len); break; + + case IPT_SO_SET_ADD_COUNTERS: + ret = do_add_counters(user, len, 0); + break; + + default: + duprintf("do_ipt_set_ctl: unknown request %i\n", cmd); + ret = -EINVAL; } + return ret; +} + +static int +do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) +{ + int ret; + + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + switch (cmd) { + case IPT_SO_GET_INFO: + ret = get_info(user, len, 0); + break; + + case IPT_SO_GET_ENTRIES: + ret = get_entries(user, len); + break; + case IPT_SO_GET_REVISION_MATCH: case IPT_SO_GET_REVISION_TARGET: { struct ipt_get_revision rev; @@ -1336,6 +2203,9 @@ static struct ipt_target ipt_standard_target = { .name = IPT_STANDARD_TARGET, .targetsize = sizeof(int), .family = AF_INET, +#ifdef CONFIG_COMPAT + .compat = &compat_ipt_standard_fn, +#endif }; static struct ipt_target ipt_error_target = { @@ -1350,9 +2220,15 @@ static struct nf_sockopt_ops ipt_sockopts = { .set_optmin = IPT_BASE_CTL, .set_optmax = IPT_SO_SET_MAX+1, .set = do_ipt_set_ctl, +#ifdef CONFIG_COMPAT + .compat_set = compat_do_ipt_set_ctl, +#endif .get_optmin = IPT_BASE_CTL, .get_optmax = IPT_SO_GET_MAX+1, .get = do_ipt_get_ctl, +#ifdef CONFIG_COMPAT + .compat_get = compat_do_ipt_get_ctl, +#endif }; static struct ipt_match icmp_matchstruct = { |