diff options
Diffstat (limited to 'net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c')
| -rw-r--r-- | net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 74 |
1 files changed, 32 insertions, 42 deletions
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c index fd62a41d69c..64552afd01c 100644 --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c @@ -24,12 +24,6 @@ #include <net/netfilter/nf_conntrack_core.h> #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> -#if 0 -#define DEBUGP printk -#else -#define DEBUGP(format, args...) -#endif - static int ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, struct nf_conntrack_tuple *tuple) { @@ -84,36 +78,30 @@ nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user) return skb; } -static int -ipv4_prepare(struct sk_buff **pskb, unsigned int hooknum, unsigned int *dataoff, - u_int8_t *protonum) +static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, + unsigned int *dataoff, u_int8_t *protonum) { + struct iphdr _iph, *iph; + + iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); + if (iph == NULL) + return -NF_DROP; + /* Never happen */ - if (ip_hdr(*pskb)->frag_off & htons(IP_OFFSET)) { + if (iph->frag_off & htons(IP_OFFSET)) { if (net_ratelimit()) { - printk(KERN_ERR "ipv4_prepare: Frag of proto %u (hook=%u)\n", - ip_hdr(*pskb)->protocol, hooknum); + printk(KERN_ERR "ipv4_get_l4proto: Frag of proto %u\n", + iph->protocol); } return -NF_DROP; } - *dataoff = skb_network_offset(*pskb) + ip_hdrlen(*pskb); - *protonum = ip_hdr(*pskb)->protocol; + *dataoff = nhoff + (iph->ihl << 2); + *protonum = iph->protocol; return NF_ACCEPT; } -int nf_nat_module_is_loaded = 0; -EXPORT_SYMBOL_GPL(nf_nat_module_is_loaded); - -static u_int32_t ipv4_get_features(const struct nf_conntrack_tuple *tuple) -{ - if (nf_nat_module_is_loaded) - return NF_CT_F_NAT; - - return NF_CT_F_BASIC; -} - static unsigned int ipv4_confirm(unsigned int hooknum, struct sk_buff **pskb, const struct net_device *in, @@ -133,6 +121,7 @@ static unsigned int ipv4_conntrack_help(unsigned int hooknum, struct nf_conn *ct; enum ip_conntrack_info ctinfo; struct nf_conn_help *help; + struct nf_conntrack_helper *helper; /* This is where we call the helper: as the packet goes out. */ ct = nf_ct_get(*pskb, &ctinfo); @@ -140,12 +129,14 @@ static unsigned int ipv4_conntrack_help(unsigned int hooknum, return NF_ACCEPT; help = nfct_help(ct); - if (!help || !help->helper) + if (!help) return NF_ACCEPT; - - return help->helper->help(pskb, - skb_network_offset(*pskb) + ip_hdrlen(*pskb), - ct, ctinfo); + /* rcu_read_lock()ed by nf_hook_slow */ + helper = rcu_dereference(help->helper); + if (!helper) + return NF_ACCEPT; + return helper->help(pskb, skb_network_offset(*pskb) + ip_hdrlen(*pskb), + ct, ctinfo); } static unsigned int ipv4_conntrack_defrag(unsigned int hooknum, @@ -332,17 +323,17 @@ getorigdst(struct sock *sk, int optval, void __user *user, int *len) /* We only do TCP at the moment: is there a better way? */ if (strcmp(sk->sk_prot->name, "TCP")) { - DEBUGP("SO_ORIGINAL_DST: Not a TCP socket\n"); + pr_debug("SO_ORIGINAL_DST: Not a TCP socket\n"); return -ENOPROTOOPT; } if ((unsigned int) *len < sizeof(struct sockaddr_in)) { - DEBUGP("SO_ORIGINAL_DST: len %u not %u\n", - *len, sizeof(struct sockaddr_in)); + pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n", + *len, sizeof(struct sockaddr_in)); return -EINVAL; } - h = nf_conntrack_find_get(&tuple, NULL); + h = nf_conntrack_find_get(&tuple); if (h) { struct sockaddr_in sin; struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); @@ -354,17 +345,17 @@ getorigdst(struct sock *sk, int optval, void __user *user, int *len) .tuple.dst.u3.ip; memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); - DEBUGP("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n", - NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port)); + pr_debug("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n", + NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port)); nf_ct_put(ct); if (copy_to_user(user, &sin, sizeof(sin)) != 0) return -EFAULT; else return 0; } - DEBUGP("SO_ORIGINAL_DST: Can't find %u.%u.%u.%u/%u-%u.%u.%u.%u/%u.\n", - NIPQUAD(tuple.src.u3.ip), ntohs(tuple.src.u.tcp.port), - NIPQUAD(tuple.dst.u3.ip), ntohs(tuple.dst.u.tcp.port)); + pr_debug("SO_ORIGINAL_DST: Can't find %u.%u.%u.%u/%u-%u.%u.%u.%u/%u.\n", + NIPQUAD(tuple.src.u3.ip), ntohs(tuple.src.u.tcp.port), + NIPQUAD(tuple.dst.u3.ip), ntohs(tuple.dst.u.tcp.port)); return -ENOENT; } @@ -414,15 +405,14 @@ static struct nf_sockopt_ops so_getorigdst = { .get = &getorigdst, }; -struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 = { +struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { .l3proto = PF_INET, .name = "ipv4", .pkt_to_tuple = ipv4_pkt_to_tuple, .invert_tuple = ipv4_invert_tuple, .print_tuple = ipv4_print_tuple, .print_conntrack = ipv4_print_conntrack, - .prepare = ipv4_prepare, - .get_features = ipv4_get_features, + .get_l4proto = ipv4_get_l4proto, #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) .tuple_to_nfattr = ipv4_tuple_to_nfattr, .nfattr_to_tuple = ipv4_nfattr_to_tuple, |