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[NETFILTER]: ip6_tables: add compat support
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
David S. Miller
parent
d924357c50
commit
3bc3fe5eed
@ -326,5 +326,40 @@ extern int ip6_masked_addrcmp(const struct in6_addr *addr1,
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#define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1))
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#ifdef CONFIG_COMPAT
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#include <net/compat.h>
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struct compat_ip6t_entry
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{
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struct ip6t_ip6 ipv6;
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compat_uint_t nfcache;
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u_int16_t target_offset;
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u_int16_t next_offset;
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compat_uint_t comefrom;
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struct compat_xt_counters counters;
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unsigned char elems[0];
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};
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static inline struct ip6t_entry_target *
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compat_ip6t_get_target(struct compat_ip6t_entry *e)
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{
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return (void *)e + e->target_offset;
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}
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#define COMPAT_IP6T_ALIGN(s) COMPAT_XT_ALIGN(s)
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/* fn returns 0 to continue iteration */
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#define COMPAT_IP6T_MATCH_ITERATE(e, fn, args...) \
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XT_MATCH_ITERATE(struct compat_ip6t_entry, e, fn, ## args)
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/* fn returns 0 to continue iteration */
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#define COMPAT_IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
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XT_ENTRY_ITERATE(struct compat_ip6t_entry, entries, size, fn, ## args)
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#define COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entries, size, n, fn, args...) \
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XT_ENTRY_ITERATE_CONTINUE(struct compat_ip6t_entry, entries, size, n, \
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fn, ## args)
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#endif /* CONFIG_COMPAT */
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#endif /*__KERNEL__*/
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#endif /* _IP6_TABLES_H */
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106
net/compat.c
106
net/compat.c
@ -20,7 +20,6 @@
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#include <linux/syscalls.h>
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#include <linux/filter.h>
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#include <linux/compat.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/security.h>
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#include <net/scm.h>
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@ -316,107 +315,6 @@ void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
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__scm_destroy(scm);
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}
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/*
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* For now, we assume that the compatibility and native version
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* of struct ipt_entry are the same - sfr. FIXME
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*/
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struct compat_ipt_replace {
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char name[IPT_TABLE_MAXNAMELEN];
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u32 valid_hooks;
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u32 num_entries;
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u32 size;
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u32 hook_entry[NF_INET_NUMHOOKS];
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u32 underflow[NF_INET_NUMHOOKS];
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u32 num_counters;
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compat_uptr_t counters; /* struct ipt_counters * */
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struct ipt_entry entries[0];
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};
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static int do_netfilter_replace(int fd, int level, int optname,
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char __user *optval, int optlen)
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{
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struct compat_ipt_replace __user *urepl;
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struct ipt_replace __user *repl_nat;
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char name[IPT_TABLE_MAXNAMELEN];
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u32 origsize, tmp32, num_counters;
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unsigned int repl_nat_size;
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int ret;
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int i;
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compat_uptr_t ucntrs;
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urepl = (struct compat_ipt_replace __user *)optval;
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if (get_user(origsize, &urepl->size))
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return -EFAULT;
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/* Hack: Causes ipchains to give correct error msg --RR */
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if (optlen != sizeof(*urepl) + origsize)
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return -ENOPROTOOPT;
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/* XXX Assumes that size of ipt_entry is the same both in
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* native and compat environments.
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*/
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repl_nat_size = sizeof(*repl_nat) + origsize;
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repl_nat = compat_alloc_user_space(repl_nat_size);
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ret = -EFAULT;
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if (put_user(origsize, &repl_nat->size))
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goto out;
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if (!access_ok(VERIFY_READ, urepl, optlen) ||
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!access_ok(VERIFY_WRITE, repl_nat, optlen))
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goto out;
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if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
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__copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
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goto out;
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if (__get_user(tmp32, &urepl->valid_hooks) ||
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__put_user(tmp32, &repl_nat->valid_hooks))
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goto out;
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if (__get_user(tmp32, &urepl->num_entries) ||
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__put_user(tmp32, &repl_nat->num_entries))
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goto out;
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if (__get_user(num_counters, &urepl->num_counters) ||
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__put_user(num_counters, &repl_nat->num_counters))
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goto out;
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if (__get_user(ucntrs, &urepl->counters) ||
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__put_user(compat_ptr(ucntrs), &repl_nat->counters))
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goto out;
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if (__copy_in_user(&repl_nat->entries[0],
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&urepl->entries[0],
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origsize))
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goto out;
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for (i = 0; i < NF_INET_NUMHOOKS; i++) {
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if (__get_user(tmp32, &urepl->hook_entry[i]) ||
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__put_user(tmp32, &repl_nat->hook_entry[i]) ||
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__get_user(tmp32, &urepl->underflow[i]) ||
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__put_user(tmp32, &repl_nat->underflow[i]))
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goto out;
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}
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/*
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* Since struct ipt_counters just contains two u_int64_t members
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* we can just do the access_ok check here and pass the (converted)
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* pointer into the standard syscall. We hope that the pointer is
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* not misaligned ...
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*/
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if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
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num_counters * sizeof(struct ipt_counters)))
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goto out;
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ret = sys_setsockopt(fd, level, optname,
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(char __user *)repl_nat, repl_nat_size);
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out:
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return ret;
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}
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/*
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* A struct sock_filter is architecture independent.
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*/
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@ -485,10 +383,6 @@ asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
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int err;
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struct socket *sock;
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if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE)
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return do_netfilter_replace(fd, level, optname,
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optval, optlen);
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if (optlen < 0)
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return -EINVAL;
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@ -19,9 +19,11 @@
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#include <linux/poison.h>
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#include <linux/icmpv6.h>
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#include <net/ipv6.h>
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#include <net/compat.h>
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#include <asm/uaccess.h>
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#include <linux/mutex.h>
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#include <linux/proc_fs.h>
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#include <linux/err.h>
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#include <linux/cpumask.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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@ -1037,7 +1039,80 @@ copy_entries_to_user(unsigned int total_size,
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return ret;
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}
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static int get_info(void __user *user, int *len)
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#ifdef CONFIG_COMPAT
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static void compat_standard_from_user(void *dst, void *src)
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{
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int v = *(compat_int_t *)src;
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if (v > 0)
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v += xt_compat_calc_jump(AF_INET6, v);
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memcpy(dst, &v, sizeof(v));
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}
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static int compat_standard_to_user(void __user *dst, void *src)
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{
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compat_int_t cv = *(int *)src;
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if (cv > 0)
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cv -= xt_compat_calc_jump(AF_INET6, cv);
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return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
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}
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static inline int
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compat_calc_match(struct ip6t_entry_match *m, int *size)
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{
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*size += xt_compat_match_offset(m->u.kernel.match);
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return 0;
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}
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static int compat_calc_entry(struct ip6t_entry *e,
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const struct xt_table_info *info,
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void *base, struct xt_table_info *newinfo)
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{
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struct ip6t_entry_target *t;
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unsigned int entry_offset;
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int off, i, ret;
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off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
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entry_offset = (void *)e - base;
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IP6T_MATCH_ITERATE(e, compat_calc_match, &off);
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t = ip6t_get_target(e);
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off += xt_compat_target_offset(t->u.kernel.target);
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newinfo->size -= off;
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ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
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if (ret)
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return ret;
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for (i = 0; i < NF_INET_NUMHOOKS; i++) {
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if (info->hook_entry[i] &&
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(e < (struct ip6t_entry *)(base + info->hook_entry[i])))
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newinfo->hook_entry[i] -= off;
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if (info->underflow[i] &&
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(e < (struct ip6t_entry *)(base + info->underflow[i])))
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newinfo->underflow[i] -= off;
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}
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return 0;
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}
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static int compat_table_info(const struct xt_table_info *info,
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struct xt_table_info *newinfo)
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{
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void *loc_cpu_entry;
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if (!newinfo || !info)
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return -EINVAL;
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/* we dont care about newinfo->entries[] */
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memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
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newinfo->initial_entries = 0;
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loc_cpu_entry = info->entries[raw_smp_processor_id()];
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return IP6T_ENTRY_ITERATE(loc_cpu_entry, info->size,
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compat_calc_entry, info, loc_cpu_entry,
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newinfo);
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}
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#endif
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static int get_info(void __user *user, int *len, int compat)
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{
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char name[IP6T_TABLE_MAXNAMELEN];
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struct xt_table *t;
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@ -1053,13 +1128,24 @@ static int get_info(void __user *user, int *len)
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return -EFAULT;
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name[IP6T_TABLE_MAXNAMELEN-1] = '\0';
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#ifdef CONFIG_COMPAT
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if (compat)
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xt_compat_lock(AF_INET6);
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#endif
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t = try_then_request_module(xt_find_table_lock(AF_INET6, name),
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"ip6table_%s", name);
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if (t && !IS_ERR(t)) {
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struct ip6t_getinfo info;
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struct xt_table_info *private = t->private;
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#ifdef CONFIG_COMPAT
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if (compat) {
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struct xt_table_info tmp;
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ret = compat_table_info(private, &tmp);
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xt_compat_flush_offsets(AF_INET6);
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private = &tmp;
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}
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#endif
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info.valid_hooks = t->valid_hooks;
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memcpy(info.hook_entry, private->hook_entry,
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sizeof(info.hook_entry));
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@ -1078,6 +1164,10 @@ static int get_info(void __user *user, int *len)
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module_put(t->me);
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} else
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ret = t ? PTR_ERR(t) : -ENOENT;
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#ifdef CONFIG_COMPAT
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if (compat)
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xt_compat_unlock(AF_INET6);
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#endif
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return ret;
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}
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@ -1120,15 +1210,84 @@ get_entries(struct ip6t_get_entries __user *uptr, int *len)
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return ret;
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}
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static int
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__do_replace(const char *name, unsigned int valid_hooks,
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struct xt_table_info *newinfo, unsigned int num_counters,
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void __user *counters_ptr)
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{
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int ret;
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struct xt_table *t;
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struct xt_table_info *oldinfo;
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struct xt_counters *counters;
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void *loc_cpu_old_entry;
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ret = 0;
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counters = vmalloc_node(num_counters * sizeof(struct xt_counters),
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numa_node_id());
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if (!counters) {
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ret = -ENOMEM;
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goto out;
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}
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t = try_then_request_module(xt_find_table_lock(AF_INET6, name),
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"ip6table_%s", name);
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if (!t || IS_ERR(t)) {
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ret = t ? PTR_ERR(t) : -ENOENT;
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goto free_newinfo_counters_untrans;
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}
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/* You lied! */
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if (valid_hooks != t->valid_hooks) {
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duprintf("Valid hook crap: %08X vs %08X\n",
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valid_hooks, t->valid_hooks);
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ret = -EINVAL;
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goto put_module;
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}
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oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
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if (!oldinfo)
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goto put_module;
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/* Update module usage count based on number of rules */
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duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
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oldinfo->number, oldinfo->initial_entries, newinfo->number);
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if ((oldinfo->number > oldinfo->initial_entries) ||
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(newinfo->number <= oldinfo->initial_entries))
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module_put(t->me);
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if ((oldinfo->number > oldinfo->initial_entries) &&
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(newinfo->number <= oldinfo->initial_entries))
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module_put(t->me);
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/* Get the old counters. */
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get_counters(oldinfo, counters);
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/* Decrease module usage counts and free resource */
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loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
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IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,
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NULL);
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xt_free_table_info(oldinfo);
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if (copy_to_user(counters_ptr, counters,
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sizeof(struct xt_counters) * num_counters) != 0)
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ret = -EFAULT;
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vfree(counters);
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xt_table_unlock(t);
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return ret;
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put_module:
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module_put(t->me);
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xt_table_unlock(t);
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free_newinfo_counters_untrans:
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vfree(counters);
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out:
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return ret;
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}
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static int
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do_replace(void __user *user, unsigned int len)
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{
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int ret;
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struct ip6t_replace tmp;
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struct xt_table *t;
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struct xt_table_info *newinfo, *oldinfo;
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struct xt_counters *counters;
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void *loc_cpu_entry, *loc_cpu_old_entry;
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struct xt_table_info *newinfo;
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void *loc_cpu_entry;
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if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
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return -EFAULT;
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@ -1149,70 +1308,22 @@ do_replace(void __user *user, unsigned int len)
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goto free_newinfo;
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}
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counters = vmalloc_node(tmp.num_counters * sizeof(struct xt_counters),
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numa_node_id());
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if (!counters) {
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ret = -ENOMEM;
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goto free_newinfo;
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}
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ret = translate_table(tmp.name, tmp.valid_hooks,
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newinfo, loc_cpu_entry, tmp.size, tmp.num_entries,
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tmp.hook_entry, tmp.underflow);
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if (ret != 0)
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goto free_newinfo_counters;
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goto free_newinfo;
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duprintf("ip_tables: Translated table\n");
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t = try_then_request_module(xt_find_table_lock(AF_INET6, tmp.name),
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"ip6table_%s", tmp.name);
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if (!t || IS_ERR(t)) {
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ret = t ? PTR_ERR(t) : -ENOENT;
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goto free_newinfo_counters_untrans;
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}
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ret = __do_replace(tmp.name, tmp.valid_hooks, newinfo,
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tmp.num_counters, tmp.counters);
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if (ret)
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goto free_newinfo_untrans;
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return 0;
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/* You lied! */
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if (tmp.valid_hooks != t->valid_hooks) {
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duprintf("Valid hook crap: %08X vs %08X\n",
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tmp.valid_hooks, t->valid_hooks);
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ret = -EINVAL;
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goto put_module;
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}
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oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret);
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if (!oldinfo)
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goto put_module;
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/* Update module usage count based on number of rules */
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duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
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oldinfo->number, oldinfo->initial_entries, newinfo->number);
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if ((oldinfo->number > oldinfo->initial_entries) ||
|
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(newinfo->number <= oldinfo->initial_entries))
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module_put(t->me);
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if ((oldinfo->number > oldinfo->initial_entries) &&
|
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(newinfo->number <= oldinfo->initial_entries))
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module_put(t->me);
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/* Get the old counters. */
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get_counters(oldinfo, counters);
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/* Decrease module usage counts and free resource */
|
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loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
|
||||
IP6T_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)
|
||||
ret = -EFAULT;
|
||||
vfree(counters);
|
||||
xt_table_unlock(t);
|
||||
return ret;
|
||||
|
||||
put_module:
|
||||
module_put(t->me);
|
||||
xt_table_unlock(t);
|
||||
free_newinfo_counters_untrans:
|
||||
IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL);
|
||||
free_newinfo_counters:
|
||||
vfree(counters);
|
||||
free_newinfo_untrans:
|
||||
IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL);
|
||||
free_newinfo:
|
||||
xt_free_table_info(newinfo);
|
||||
return ret;
|
||||
@ -1241,31 +1352,59 @@ add_counter_to_entry(struct ip6t_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 xt_table_info *private;
|
||||
struct xt_table *t;
|
||||
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_INET6, tmp.name);
|
||||
t = xt_find_table_lock(AF_INET6, name);
|
||||
if (!t || IS_ERR(t)) {
|
||||
ret = t ? PTR_ERR(t) : -ENOENT;
|
||||
goto free;
|
||||
@ -1273,7 +1412,7 @@ do_add_counters(void __user *user, unsigned int len)
|
||||
|
||||
write_lock_bh(&t->lock);
|
||||
private = t->private;
|
||||
if (private->number != tmp.num_counters) {
|
||||
if (private->number != num_counters) {
|
||||
ret = -EINVAL;
|
||||
goto unlock_up_free;
|
||||
}
|
||||
@ -1284,7 +1423,7 @@ do_add_counters(void __user *user, unsigned int len)
|
||||
IP6T_ENTRY_ITERATE(loc_cpu_entry,
|
||||
private->size,
|
||||
add_counter_to_entry,
|
||||
paddc->counters,
|
||||
paddc,
|
||||
&i);
|
||||
unlock_up_free:
|
||||
write_unlock_bh(&t->lock);
|
||||
@ -1296,6 +1435,567 @@ do_add_counters(void __user *user, unsigned int len)
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
struct compat_ip6t_replace {
|
||||
char name[IP6T_TABLE_MAXNAMELEN];
|
||||
u32 valid_hooks;
|
||||
u32 num_entries;
|
||||
u32 size;
|
||||
u32 hook_entry[NF_INET_NUMHOOKS];
|
||||
u32 underflow[NF_INET_NUMHOOKS];
|
||||
u32 num_counters;
|
||||
compat_uptr_t counters; /* struct ip6t_counters * */
|
||||
struct compat_ip6t_entry entries[0];
|
||||
};
|
||||
|
||||
static int
|
||||
compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
|
||||
compat_uint_t *size, struct xt_counters *counters,
|
||||
unsigned int *i)
|
||||
{
|
||||
struct ip6t_entry_target *t;
|
||||
struct compat_ip6t_entry __user *ce;
|
||||
u_int16_t target_offset, next_offset;
|
||||
compat_uint_t origsize;
|
||||
int ret;
|
||||
|
||||
ret = -EFAULT;
|
||||
origsize = *size;
|
||||
ce = (struct compat_ip6t_entry __user *)*dstptr;
|
||||
if (copy_to_user(ce, e, sizeof(struct ip6t_entry)))
|
||||
goto out;
|
||||
|
||||
if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i])))
|
||||
goto out;
|
||||
|
||||
*dstptr += sizeof(struct compat_ip6t_entry);
|
||||
*size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
|
||||
|
||||
ret = IP6T_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size);
|
||||
target_offset = e->target_offset - (origsize - *size);
|
||||
if (ret)
|
||||
goto out;
|
||||
t = ip6t_get_target(e);
|
||||
ret = xt_compat_target_to_user(t, dstptr, size);
|
||||
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;
|
||||
|
||||
(*i)++;
|
||||
return 0;
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int
|
||||
compat_find_calc_match(struct ip6t_entry_match *m,
|
||||
const char *name,
|
||||
const struct ip6t_ip6 *ipv6,
|
||||
unsigned int hookmask,
|
||||
int *size, int *i)
|
||||
{
|
||||
struct xt_match *match;
|
||||
|
||||
match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name,
|
||||
m->u.user.revision),
|
||||
"ip6t_%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;
|
||||
*size += xt_compat_match_offset(match);
|
||||
|
||||
(*i)++;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int
|
||||
compat_release_match(struct ip6t_entry_match *m, unsigned int *i)
|
||||
{
|
||||
if (i && (*i)-- == 0)
|
||||
return 1;
|
||||
|
||||
module_put(m->u.kernel.match->me);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int
|
||||
compat_release_entry(struct compat_ip6t_entry *e, unsigned int *i)
|
||||
{
|
||||
struct ip6t_entry_target *t;
|
||||
|
||||
if (i && (*i)-- == 0)
|
||||
return 1;
|
||||
|
||||
/* Cleanup all matches */
|
||||
COMPAT_IP6T_MATCH_ITERATE(e, compat_release_match, NULL);
|
||||
t = compat_ip6t_get_target(e);
|
||||
module_put(t->u.kernel.target->me);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int
|
||||
check_compat_entry_size_and_hooks(struct compat_ip6t_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 ip6t_entry_target *t;
|
||||
struct xt_target *target;
|
||||
unsigned int entry_offset;
|
||||
int ret, off, h, j;
|
||||
|
||||
duprintf("check_compat_entry_size_and_hooks %p\n", e);
|
||||
if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0
|
||||
|| (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) {
|
||||
duprintf("Bad offset %p, limit = %p\n", e, limit);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (e->next_offset < sizeof(struct compat_ip6t_entry) +
|
||||
sizeof(struct compat_xt_entry_target)) {
|
||||
duprintf("checking: element %p size %u\n",
|
||||
e, e->next_offset);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* For purposes of check_entry casting the compat entry is fine */
|
||||
ret = check_entry((struct ip6t_entry *)e, name);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
|
||||
entry_offset = (void *)e - (void *)base;
|
||||
j = 0;
|
||||
ret = COMPAT_IP6T_MATCH_ITERATE(e, compat_find_calc_match, name,
|
||||
&e->ipv6, e->comefrom, &off, &j);
|
||||
if (ret != 0)
|
||||
goto release_matches;
|
||||
|
||||
t = compat_ip6t_get_target(e);
|
||||
target = try_then_request_module(xt_find_target(AF_INET6,
|
||||
t->u.user.name,
|
||||
t->u.user.revision),
|
||||
"ip6t_%s", t->u.user.name);
|
||||
if (IS_ERR(target) || !target) {
|
||||
duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
|
||||
t->u.user.name);
|
||||
ret = target ? PTR_ERR(target) : -ENOENT;
|
||||
goto release_matches;
|
||||
}
|
||||
t->u.kernel.target = target;
|
||||
|
||||
off += xt_compat_target_offset(target);
|
||||
*size += off;
|
||||
ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
/* Check hooks & underflows */
|
||||
for (h = 0; h < NF_INET_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 */
|
||||
memset(&e->counters, 0, sizeof(e->counters));
|
||||
e->comefrom = 0;
|
||||
|
||||
(*i)++;
|
||||
return 0;
|
||||
|
||||
out:
|
||||
module_put(t->u.kernel.target->me);
|
||||
release_matches:
|
||||
IP6T_MATCH_ITERATE(e, compat_release_match, &j);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int
|
||||
compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
|
||||
unsigned int *size, const char *name,
|
||||
struct xt_table_info *newinfo, unsigned char *base)
|
||||
{
|
||||
struct ip6t_entry_target *t;
|
||||
struct xt_target *target;
|
||||
struct ip6t_entry *de;
|
||||
unsigned int origsize;
|
||||
int ret, h;
|
||||
|
||||
ret = 0;
|
||||
origsize = *size;
|
||||
de = (struct ip6t_entry *)*dstptr;
|
||||
memcpy(de, e, sizeof(struct ip6t_entry));
|
||||
memcpy(&de->counters, &e->counters, sizeof(e->counters));
|
||||
|
||||
*dstptr += sizeof(struct ip6t_entry);
|
||||
*size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
|
||||
|
||||
ret = COMPAT_IP6T_MATCH_ITERATE(e, xt_compat_match_from_user,
|
||||
dstptr, size);
|
||||
if (ret)
|
||||
return ret;
|
||||
de->target_offset = e->target_offset - (origsize - *size);
|
||||
t = compat_ip6t_get_target(e);
|
||||
target = t->u.kernel.target;
|
||||
xt_compat_target_from_user(t, dstptr, size);
|
||||
|
||||
de->next_offset = e->next_offset - (origsize - *size);
|
||||
for (h = 0; h < NF_INET_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;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int compat_check_entry(struct ip6t_entry *e, const char *name,
|
||||
unsigned int *i)
|
||||
{
|
||||
int j, ret;
|
||||
|
||||
j = 0;
|
||||
ret = IP6T_MATCH_ITERATE(e, check_match, name, &e->ipv6,
|
||||
e->comefrom, &j);
|
||||
if (ret)
|
||||
goto cleanup_matches;
|
||||
|
||||
ret = check_target(e, name);
|
||||
if (ret)
|
||||
goto cleanup_matches;
|
||||
|
||||
(*i)++;
|
||||
return 0;
|
||||
|
||||
cleanup_matches:
|
||||
IP6T_MATCH_ITERATE(e, cleanup_match, &j);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int
|
||||
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, j;
|
||||
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_INET_NUMHOOKS; i++) {
|
||||
info->hook_entry[i] = 0xFFFFFFFF;
|
||||
info->underflow[i] = 0xFFFFFFFF;
|
||||
}
|
||||
|
||||
duprintf("translate_compat_table: size %u\n", info->size);
|
||||
j = 0;
|
||||
xt_compat_lock(AF_INET6);
|
||||
/* Walk through entries, checking offsets. */
|
||||
ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size,
|
||||
check_compat_entry_size_and_hooks,
|
||||
info, &size, entry0,
|
||||
entry0 + total_size,
|
||||
hook_entries, underflows, &j, name);
|
||||
if (ret != 0)
|
||||
goto out_unlock;
|
||||
|
||||
ret = -EINVAL;
|
||||
if (j != number) {
|
||||
duprintf("translate_compat_table: %u not %u entries\n",
|
||||
j, number);
|
||||
goto out_unlock;
|
||||
}
|
||||
|
||||
/* Check hooks all assigned */
|
||||
for (i = 0; i < NF_INET_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_INET_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 = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size,
|
||||
compat_copy_entry_from_user,
|
||||
&pos, &size, name, newinfo, entry1);
|
||||
xt_compat_flush_offsets(AF_INET6);
|
||||
xt_compat_unlock(AF_INET6);
|
||||
if (ret)
|
||||
goto free_newinfo;
|
||||
|
||||
ret = -ELOOP;
|
||||
if (!mark_source_chains(newinfo, valid_hooks, entry1))
|
||||
goto free_newinfo;
|
||||
|
||||
i = 0;
|
||||
ret = IP6T_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry,
|
||||
name, &i);
|
||||
if (ret) {
|
||||
j -= i;
|
||||
COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i,
|
||||
compat_release_entry, &j);
|
||||
IP6T_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i);
|
||||
xt_free_table_info(newinfo);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* And one copy for every other CPU */
|
||||
for_each_possible_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:
|
||||
COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j);
|
||||
return ret;
|
||||
out_unlock:
|
||||
xt_compat_flush_offsets(AF_INET6);
|
||||
xt_compat_unlock(AF_INET6);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static int
|
||||
compat_do_replace(void __user *user, unsigned int len)
|
||||
{
|
||||
int ret;
|
||||
struct compat_ip6t_replace tmp;
|
||||
struct xt_table_info *newinfo;
|
||||
void *loc_cpu_entry;
|
||||
|
||||
if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
|
||||
return -EFAULT;
|
||||
|
||||
/* overflow check */
|
||||
if (tmp.size >= INT_MAX / num_possible_cpus())
|
||||
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:
|
||||
IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL);
|
||||
free_newinfo:
|
||||
xt_free_table_info(newinfo);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int
|
||||
compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
|
||||
unsigned int len)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (!capable(CAP_NET_ADMIN))
|
||||
return -EPERM;
|
||||
|
||||
switch (cmd) {
|
||||
case IP6T_SO_SET_REPLACE:
|
||||
ret = compat_do_replace(user, len);
|
||||
break;
|
||||
|
||||
case IP6T_SO_SET_ADD_COUNTERS:
|
||||
ret = do_add_counters(user, len, 1);
|
||||
break;
|
||||
|
||||
default:
|
||||
duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
struct compat_ip6t_get_entries {
|
||||
char name[IP6T_TABLE_MAXNAMELEN];
|
||||
compat_uint_t size;
|
||||
struct compat_ip6t_entry entrytable[0];
|
||||
};
|
||||
|
||||
static int
|
||||
compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
|
||||
void __user *userptr)
|
||||
{
|
||||
struct xt_counters *counters;
|
||||
struct xt_table_info *private = table->private;
|
||||
void __user *pos;
|
||||
unsigned int size;
|
||||
int ret = 0;
|
||||
void *loc_cpu_entry;
|
||||
unsigned int i = 0;
|
||||
|
||||
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 = IP6T_ENTRY_ITERATE(loc_cpu_entry, total_size,
|
||||
compat_copy_entry_to_user,
|
||||
&pos, &size, counters, &i);
|
||||
|
||||
vfree(counters);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int
|
||||
compat_get_entries(struct compat_ip6t_get_entries __user *uptr, int *len)
|
||||
{
|
||||
int ret;
|
||||
struct compat_ip6t_get_entries get;
|
||||
struct xt_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_ip6t_get_entries) + get.size) {
|
||||
duprintf("compat_get_entries: %u != %u\n", *len,
|
||||
(unsigned int)(sizeof(struct compat_ip6t_get_entries) +
|
||||
get.size));
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
xt_compat_lock(AF_INET6);
|
||||
t = xt_find_table_lock(AF_INET6, 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;
|
||||
}
|
||||
xt_compat_flush_offsets(AF_INET6);
|
||||
module_put(t->me);
|
||||
xt_table_unlock(t);
|
||||
} else
|
||||
ret = t ? PTR_ERR(t) : -ENOENT;
|
||||
|
||||
xt_compat_unlock(AF_INET6);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
|
||||
|
||||
static int
|
||||
compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (!capable(CAP_NET_ADMIN))
|
||||
return -EPERM;
|
||||
|
||||
switch (cmd) {
|
||||
case IP6T_SO_GET_INFO:
|
||||
ret = get_info(user, len, 1);
|
||||
break;
|
||||
case IP6T_SO_GET_ENTRIES:
|
||||
ret = compat_get_entries(user, len);
|
||||
break;
|
||||
default:
|
||||
ret = do_ip6t_get_ctl(sk, cmd, user, len);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int
|
||||
do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
|
||||
{
|
||||
@ -1310,7 +2010,7 @@ do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
|
||||
break;
|
||||
|
||||
case IP6T_SO_SET_ADD_COUNTERS:
|
||||
ret = do_add_counters(user, len);
|
||||
ret = do_add_counters(user, len, 0);
|
||||
break;
|
||||
|
||||
default:
|
||||
@ -1331,7 +2031,7 @@ do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
|
||||
|
||||
switch (cmd) {
|
||||
case IP6T_SO_GET_INFO:
|
||||
ret = get_info(user, len);
|
||||
ret = get_info(user, len, 0);
|
||||
break;
|
||||
|
||||
case IP6T_SO_GET_ENTRIES:
|
||||
@ -1483,6 +2183,11 @@ static struct xt_target ip6t_standard_target __read_mostly = {
|
||||
.name = IP6T_STANDARD_TARGET,
|
||||
.targetsize = sizeof(int),
|
||||
.family = AF_INET6,
|
||||
#ifdef CONFIG_COMPAT
|
||||
.compatsize = sizeof(compat_int_t),
|
||||
.compat_from_user = compat_standard_from_user,
|
||||
.compat_to_user = compat_standard_to_user,
|
||||
#endif
|
||||
};
|
||||
|
||||
static struct xt_target ip6t_error_target __read_mostly = {
|
||||
@ -1497,9 +2202,15 @@ static struct nf_sockopt_ops ip6t_sockopts = {
|
||||
.set_optmin = IP6T_BASE_CTL,
|
||||
.set_optmax = IP6T_SO_SET_MAX+1,
|
||||
.set = do_ip6t_set_ctl,
|
||||
#ifdef CONFIG_COMPAT
|
||||
.compat_set = compat_do_ip6t_set_ctl,
|
||||
#endif
|
||||
.get_optmin = IP6T_BASE_CTL,
|
||||
.get_optmax = IP6T_SO_GET_MAX+1,
|
||||
.get = do_ip6t_get_ctl,
|
||||
#ifdef CONFIG_COMPAT
|
||||
.compat_get = compat_do_ip6t_get_ctl,
|
||||
#endif
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user