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, 49 insertions, 25 deletions
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c index 8202c1c..9bdbb77 100644 --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c @@ -22,6 +22,7 @@ #include <linux/skbuff.h> #include <linux/icmp.h> #include <linux/sysctl.h> +#include <net/route.h> #include <net/ip.h> #include <linux/netfilter_ipv4.h> @@ -180,30 +181,6 @@ static unsigned int ipv4_conntrack_defrag(unsigned int hooknum, return NF_ACCEPT; } -static unsigned int ipv4_refrag(unsigned int hooknum, - struct sk_buff **pskb, - const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *)) -{ - struct rtable *rt = (struct rtable *)(*pskb)->dst; - - /* We've seen it coming out the other side: confirm */ - if (ipv4_confirm(hooknum, pskb, in, out, okfn) != NF_ACCEPT) - return NF_DROP; - - /* Local packets are never produced too large for their - interface. We degfragment them at LOCAL_OUT, however, - so we have to refragment them here. */ - if ((*pskb)->len > dst_mtu(&rt->u.dst) && - !skb_shinfo(*pskb)->tso_size) { - /* No hook can be after us, so this should be OK. */ - ip_fragment(*pskb, okfn); - return NF_STOLEN; - } - return NF_ACCEPT; -} - static unsigned int ipv4_conntrack_in(unsigned int hooknum, struct sk_buff **pskb, const struct net_device *in, @@ -283,7 +260,7 @@ static struct nf_hook_ops ipv4_conntrack_helper_in_ops = { /* Refragmenter; last chance. */ static struct nf_hook_ops ipv4_conntrack_out_ops = { - .hook = ipv4_refrag, + .hook = ipv4_confirm, .owner = THIS_MODULE, .pf = PF_INET, .hooknum = NF_IP_POST_ROUTING, @@ -392,6 +369,48 @@ getorigdst(struct sock *sk, int optval, void __user *user, int *len) return -ENOENT; } +#if defined(CONFIG_NF_CT_NETLINK) || \ + defined(CONFIG_NF_CT_NETLINK_MODULE) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_conntrack.h> + +static int ipv4_tuple_to_nfattr(struct sk_buff *skb, + const struct nf_conntrack_tuple *tuple) +{ + NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t), + &tuple->src.u3.ip); + NFA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t), + &tuple->dst.u3.ip); + return 0; + +nfattr_failure: + return -1; +} + +static const size_t cta_min_ip[CTA_IP_MAX] = { + [CTA_IP_V4_SRC-1] = sizeof(u_int32_t), + [CTA_IP_V4_DST-1] = sizeof(u_int32_t), +}; + +static int ipv4_nfattr_to_tuple(struct nfattr *tb[], + struct nf_conntrack_tuple *t) +{ + if (!tb[CTA_IP_V4_SRC-1] || !tb[CTA_IP_V4_DST-1]) + return -EINVAL; + + if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip)) + return -EINVAL; + + t->src.u3.ip = + *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_SRC-1]); + t->dst.u3.ip = + *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_DST-1]); + + return 0; +} +#endif + static struct nf_sockopt_ops so_getorigdst = { .pf = PF_INET, .get_optmin = SO_ORIGINAL_DST, @@ -408,6 +427,11 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 = { .print_conntrack = ipv4_print_conntrack, .prepare = ipv4_prepare, .get_features = ipv4_get_features, +#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, +#endif .me = THIS_MODULE, }; |