X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fipv4%2Fnetfilter%2Fnf_conntrack_l3proto_ipv4.c;h=41e79613eb0a211fa370d2650fac5e691d95ea37;hb=dd13b010368f85dfa59364ba87bfe8ae930b2832;hp=831e9b29806d2101eea4d9c3d2de35c941d3836e;hpb=347c53dca73fca317d57781f510f5ff4f6c0d0d7;p=linux-2.6 diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c index 831e9b2980..41e79613eb 100644 --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c @@ -23,11 +23,18 @@ #include #include #include +#include + +int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb, + struct nf_conn *ct, + enum ip_conntrack_info ctinfo); +EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook); static int ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, struct nf_conntrack_tuple *tuple) { - __be32 _addrs[2], *ap; + const __be32 *ap; + __be32 _addrs[2]; ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), sizeof(u_int32_t) * 2, _addrs); if (ap == NULL) @@ -56,12 +63,6 @@ static int ipv4_print_tuple(struct seq_file *s, NIPQUAD(tuple->dst.u3.ip)); } -static int ipv4_print_conntrack(struct seq_file *s, - const struct nf_conn *conntrack) -{ - return 0; -} - /* Returns new sk_buff, or NULL */ static int nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user) { @@ -82,7 +83,8 @@ static int nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user) static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, unsigned int *dataoff, u_int8_t *protonum) { - struct iphdr _iph, *iph; + const struct iphdr *iph; + struct iphdr _iph; iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); if (iph == NULL) @@ -104,36 +106,42 @@ static unsigned int ipv4_confirm(unsigned int hooknum, const struct net_device *in, const struct net_device *out, int (*okfn)(struct sk_buff *)) -{ - /* We've seen it coming out the other side: confirm it */ - return nf_conntrack_confirm(skb); -} - -static unsigned int ipv4_conntrack_help(unsigned int hooknum, - struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *)) { struct nf_conn *ct; enum ip_conntrack_info ctinfo; - struct nf_conn_help *help; - struct nf_conntrack_helper *helper; + const struct nf_conn_help *help; + const struct nf_conntrack_helper *helper; + unsigned int ret; /* This is where we call the helper: as the packet goes out. */ ct = nf_ct_get(skb, &ctinfo); if (!ct || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY) - return NF_ACCEPT; + goto out; help = nfct_help(ct); if (!help) - return NF_ACCEPT; + goto out; + /* rcu_read_lock()ed by nf_hook_slow */ helper = rcu_dereference(help->helper); if (!helper) - return NF_ACCEPT; - return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), - ct, ctinfo); + goto out; + + ret = helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), + ct, ctinfo); + if (ret != NF_ACCEPT) + return ret; + + if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) { + typeof(nf_nat_seq_adjust_hook) seq_adjust; + + seq_adjust = rcu_dereference(nf_nat_seq_adjust_hook); + if (!seq_adjust || !seq_adjust(skb, ct, ctinfo)) + return NF_DROP; + } +out: + /* We've seen it coming out the other side: confirm it */ + return nf_conntrack_confirm(skb); } static unsigned int ipv4_conntrack_defrag(unsigned int hooknum, @@ -150,7 +158,7 @@ static unsigned int ipv4_conntrack_defrag(unsigned int hooknum, /* Gather fragments. */ if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { if (nf_ct_ipv4_gather_frags(skb, - hooknum == NF_IP_PRE_ROUTING ? + hooknum == NF_INET_PRE_ROUTING ? IP_DEFRAG_CONNTRACK_IN : IP_DEFRAG_CONNTRACK_OUT)) return NF_STOLEN; @@ -185,61 +193,47 @@ static unsigned int ipv4_conntrack_local(unsigned int hooknum, /* Connection tracking may drop packets, but never alters them, so make it the first hook. */ -static struct nf_hook_ops ipv4_conntrack_ops[] = { +static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = { { .hook = ipv4_conntrack_defrag, .owner = THIS_MODULE, .pf = PF_INET, - .hooknum = NF_IP_PRE_ROUTING, + .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP_PRI_CONNTRACK_DEFRAG, }, { .hook = ipv4_conntrack_in, .owner = THIS_MODULE, .pf = PF_INET, - .hooknum = NF_IP_PRE_ROUTING, + .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP_PRI_CONNTRACK, }, { .hook = ipv4_conntrack_defrag, .owner = THIS_MODULE, .pf = PF_INET, - .hooknum = NF_IP_LOCAL_OUT, + .hooknum = NF_INET_LOCAL_OUT, .priority = NF_IP_PRI_CONNTRACK_DEFRAG, }, { .hook = ipv4_conntrack_local, .owner = THIS_MODULE, .pf = PF_INET, - .hooknum = NF_IP_LOCAL_OUT, + .hooknum = NF_INET_LOCAL_OUT, .priority = NF_IP_PRI_CONNTRACK, }, - { - .hook = ipv4_conntrack_help, - .owner = THIS_MODULE, - .pf = PF_INET, - .hooknum = NF_IP_POST_ROUTING, - .priority = NF_IP_PRI_CONNTRACK_HELPER, - }, - { - .hook = ipv4_conntrack_help, - .owner = THIS_MODULE, - .pf = PF_INET, - .hooknum = NF_IP_LOCAL_IN, - .priority = NF_IP_PRI_CONNTRACK_HELPER, - }, { .hook = ipv4_confirm, .owner = THIS_MODULE, .pf = PF_INET, - .hooknum = NF_IP_POST_ROUTING, + .hooknum = NF_INET_POST_ROUTING, .priority = NF_IP_PRI_CONNTRACK_CONFIRM, }, { .hook = ipv4_confirm, .owner = THIS_MODULE, .pf = PF_INET, - .hooknum = NF_IP_LOCAL_IN, + .hooknum = NF_INET_LOCAL_IN, .priority = NF_IP_PRI_CONNTRACK_CONFIRM, }, }; @@ -305,8 +299,8 @@ static ctl_table ip_ct_sysctl_table[] = { static int getorigdst(struct sock *sk, int optval, void __user *user, int *len) { - struct inet_sock *inet = inet_sk(sk); - struct nf_conntrack_tuple_hash *h; + const struct inet_sock *inet = inet_sk(sk); + const struct nf_conntrack_tuple_hash *h; struct nf_conntrack_tuple tuple; NF_CT_TUPLE_U_BLANK(&tuple); @@ -363,10 +357,8 @@ getorigdst(struct sock *sk, int optval, void __user *user, int *len) static int ipv4_tuple_to_nlattr(struct sk_buff *skb, const struct nf_conntrack_tuple *tuple) { - NLA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t), - &tuple->src.u3.ip); - NLA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t), - &tuple->dst.u3.ip); + NLA_PUT_BE32(skb, CTA_IP_V4_SRC, tuple->src.u3.ip); + NLA_PUT_BE32(skb, CTA_IP_V4_DST, tuple->dst.u3.ip); return 0; nla_put_failure: @@ -384,8 +376,8 @@ static int ipv4_nlattr_to_tuple(struct nlattr *tb[], if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST]) return -EINVAL; - t->src.u3.ip = *(__be32 *)nla_data(tb[CTA_IP_V4_SRC]); - t->dst.u3.ip = *(__be32 *)nla_data(tb[CTA_IP_V4_DST]); + t->src.u3.ip = nla_get_be32(tb[CTA_IP_V4_SRC]); + t->dst.u3.ip = nla_get_be32(tb[CTA_IP_V4_DST]); return 0; } @@ -405,7 +397,6 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { .pkt_to_tuple = ipv4_pkt_to_tuple, .invert_tuple = ipv4_invert_tuple, .print_tuple = ipv4_print_tuple, - .print_conntrack = ipv4_print_conntrack, .get_l4proto = ipv4_get_l4proto, #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) .tuple_to_nlattr = ipv4_tuple_to_nlattr, @@ -419,6 +410,9 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { .me = THIS_MODULE, }; +module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, + &nf_conntrack_htable_size, 0600); + MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET)); MODULE_ALIAS("ip_conntrack"); MODULE_LICENSE("GPL");