MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
-MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>");
+MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
MODULE_DESCRIPTION("Xtables: connection tracking state match");
MODULE_ALIAS("ipt_conntrack");
MODULE_ALIAS("ip6t_conntrack");
-static bool
-conntrack_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par)
-{
- const struct xt_conntrack_info *sinfo = par->matchinfo;
- const struct nf_conn *ct;
- enum ip_conntrack_info ctinfo;
- unsigned int statebit;
-
- ct = nf_ct_get(skb, &ctinfo);
-
-#define FWINV(bool, invflg) ((bool) ^ !!(sinfo->invflags & (invflg)))
-
- if (ct == &nf_conntrack_untracked)
- statebit = XT_CONNTRACK_STATE_UNTRACKED;
- else if (ct)
- statebit = XT_CONNTRACK_STATE_BIT(ctinfo);
- else
- statebit = XT_CONNTRACK_STATE_INVALID;
-
- if (sinfo->flags & XT_CONNTRACK_STATE) {
- if (ct) {
- if (test_bit(IPS_SRC_NAT_BIT, &ct->status))
- statebit |= XT_CONNTRACK_STATE_SNAT;
- if (test_bit(IPS_DST_NAT_BIT, &ct->status))
- statebit |= XT_CONNTRACK_STATE_DNAT;
- }
- if (FWINV((statebit & sinfo->statemask) == 0,
- XT_CONNTRACK_STATE))
- return false;
- }
-
- if (ct == NULL) {
- if (sinfo->flags & ~XT_CONNTRACK_STATE)
- return false;
- return true;
- }
-
- if (sinfo->flags & XT_CONNTRACK_PROTO &&
- FWINV(nf_ct_protonum(ct) !=
- sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum,
- XT_CONNTRACK_PROTO))
- return false;
-
- if (sinfo->flags & XT_CONNTRACK_ORIGSRC &&
- FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip &
- sinfo->sipmsk[IP_CT_DIR_ORIGINAL].s_addr) !=
- sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip,
- XT_CONNTRACK_ORIGSRC))
- return false;
-
- if (sinfo->flags & XT_CONNTRACK_ORIGDST &&
- FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.ip &
- sinfo->dipmsk[IP_CT_DIR_ORIGINAL].s_addr) !=
- sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip,
- XT_CONNTRACK_ORIGDST))
- return false;
-
- if (sinfo->flags & XT_CONNTRACK_REPLSRC &&
- FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip &
- sinfo->sipmsk[IP_CT_DIR_REPLY].s_addr) !=
- sinfo->tuple[IP_CT_DIR_REPLY].src.ip,
- XT_CONNTRACK_REPLSRC))
- return false;
-
- if (sinfo->flags & XT_CONNTRACK_REPLDST &&
- FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip &
- sinfo->dipmsk[IP_CT_DIR_REPLY].s_addr) !=
- sinfo->tuple[IP_CT_DIR_REPLY].dst.ip,
- XT_CONNTRACK_REPLDST))
- return false;
-
- if (sinfo->flags & XT_CONNTRACK_STATUS &&
- FWINV((ct->status & sinfo->statusmask) == 0,
- XT_CONNTRACK_STATUS))
- return false;
-
- if(sinfo->flags & XT_CONNTRACK_EXPIRES) {
- unsigned long expires = timer_pending(&ct->timeout) ?
- (ct->timeout.expires - jiffies)/HZ : 0;
-
- if (FWINV(!(expires >= sinfo->expires_min &&
- expires <= sinfo->expires_max),
- XT_CONNTRACK_EXPIRES))
- return false;
- }
- return true;
-#undef FWINV
-}
-
static bool
conntrack_addrcmp(const union nf_inet_addr *kaddr,
const union nf_inet_addr *uaddr,
conntrack_mt_destroy(par);
}
-#ifdef CONFIG_COMPAT
-struct compat_xt_conntrack_info
-{
- compat_uint_t statemask;
- compat_uint_t statusmask;
- struct ip_conntrack_old_tuple tuple[IP_CT_DIR_MAX];
- struct in_addr sipmsk[IP_CT_DIR_MAX];
- struct in_addr dipmsk[IP_CT_DIR_MAX];
- compat_ulong_t expires_min;
- compat_ulong_t expires_max;
- u_int8_t flags;
- u_int8_t invflags;
-};
-
-static void conntrack_mt_compat_from_user_v0(void *dst, void *src)
-{
- const struct compat_xt_conntrack_info *cm = src;
- struct xt_conntrack_info m = {
- .statemask = cm->statemask,
- .statusmask = cm->statusmask,
- .expires_min = cm->expires_min,
- .expires_max = cm->expires_max,
- .flags = cm->flags,
- .invflags = cm->invflags,
- };
- memcpy(m.tuple, cm->tuple, sizeof(m.tuple));
- memcpy(m.sipmsk, cm->sipmsk, sizeof(m.sipmsk));
- memcpy(m.dipmsk, cm->dipmsk, sizeof(m.dipmsk));
- memcpy(dst, &m, sizeof(m));
-}
-
-static int conntrack_mt_compat_to_user_v0(void __user *dst, void *src)
-{
- const struct xt_conntrack_info *m = src;
- struct compat_xt_conntrack_info cm = {
- .statemask = m->statemask,
- .statusmask = m->statusmask,
- .expires_min = m->expires_min,
- .expires_max = m->expires_max,
- .flags = m->flags,
- .invflags = m->invflags,
- };
- memcpy(cm.tuple, m->tuple, sizeof(cm.tuple));
- memcpy(cm.sipmsk, m->sipmsk, sizeof(cm.sipmsk));
- memcpy(cm.dipmsk, m->dipmsk, sizeof(cm.dipmsk));
- return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
-}
-#endif
-
static struct xt_match conntrack_mt_reg[] __read_mostly = {
- {
- .name = "conntrack",
- .revision = 0,
- .family = NFPROTO_IPV4,
- .match = conntrack_mt_v0,
- .checkentry = conntrack_mt_check,
- .destroy = conntrack_mt_destroy,
- .matchsize = sizeof(struct xt_conntrack_info),
- .me = THIS_MODULE,
-#ifdef CONFIG_COMPAT
- .compatsize = sizeof(struct compat_xt_conntrack_info),
- .compat_from_user = conntrack_mt_compat_from_user_v0,
- .compat_to_user = conntrack_mt_compat_to_user_v0,
-#endif
- },
{
.name = "conntrack",
.revision = 1,
projects / mv-sheeva.git / blobdiff