diff options
Diffstat (limited to 'net/ipv6/netfilter/nf_flow_table_ipv6.c')
-rw-r--r-- | net/ipv6/netfilter/nf_flow_table_ipv6.c | 246 |
1 files changed, 1 insertions, 245 deletions
diff --git a/net/ipv6/netfilter/nf_flow_table_ipv6.c b/net/ipv6/netfilter/nf_flow_table_ipv6.c index 207cb35..c511d20 100644 --- a/net/ipv6/netfilter/nf_flow_table_ipv6.c +++ b/net/ipv6/netfilter/nf_flow_table_ipv6.c @@ -3,256 +3,12 @@ #include <linux/module.h> #include <linux/netfilter.h> #include <linux/rhashtable.h> -#include <linux/ipv6.h> -#include <linux/netdevice.h> -#include <net/ipv6.h> -#include <net/ip6_route.h> -#include <net/neighbour.h> #include <net/netfilter/nf_flow_table.h> #include <net/netfilter/nf_tables.h> -/* For layer 4 checksum field offset. */ -#include <linux/tcp.h> -#include <linux/udp.h> - -static int nf_flow_nat_ipv6_tcp(struct sk_buff *skb, unsigned int thoff, - struct in6_addr *addr, - struct in6_addr *new_addr) -{ - struct tcphdr *tcph; - - if (!pskb_may_pull(skb, thoff + sizeof(*tcph)) || - skb_try_make_writable(skb, thoff + sizeof(*tcph))) - return -1; - - tcph = (void *)(skb_network_header(skb) + thoff); - inet_proto_csum_replace16(&tcph->check, skb, addr->s6_addr32, - new_addr->s6_addr32, true); - - return 0; -} - -static int nf_flow_nat_ipv6_udp(struct sk_buff *skb, unsigned int thoff, - struct in6_addr *addr, - struct in6_addr *new_addr) -{ - struct udphdr *udph; - - if (!pskb_may_pull(skb, thoff + sizeof(*udph)) || - skb_try_make_writable(skb, thoff + sizeof(*udph))) - return -1; - - udph = (void *)(skb_network_header(skb) + thoff); - if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) { - inet_proto_csum_replace16(&udph->check, skb, addr->s6_addr32, - new_addr->s6_addr32, true); - if (!udph->check) - udph->check = CSUM_MANGLED_0; - } - - return 0; -} - -static int nf_flow_nat_ipv6_l4proto(struct sk_buff *skb, struct ipv6hdr *ip6h, - unsigned int thoff, struct in6_addr *addr, - struct in6_addr *new_addr) -{ - switch (ip6h->nexthdr) { - case IPPROTO_TCP: - if (nf_flow_nat_ipv6_tcp(skb, thoff, addr, new_addr) < 0) - return NF_DROP; - break; - case IPPROTO_UDP: - if (nf_flow_nat_ipv6_udp(skb, thoff, addr, new_addr) < 0) - return NF_DROP; - break; - } - - return 0; -} - -static int nf_flow_snat_ipv6(const struct flow_offload *flow, - struct sk_buff *skb, struct ipv6hdr *ip6h, - unsigned int thoff, - enum flow_offload_tuple_dir dir) -{ - struct in6_addr addr, new_addr; - - switch (dir) { - case FLOW_OFFLOAD_DIR_ORIGINAL: - addr = ip6h->saddr; - new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_v6; - ip6h->saddr = new_addr; - break; - case FLOW_OFFLOAD_DIR_REPLY: - addr = ip6h->daddr; - new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_v6; - ip6h->daddr = new_addr; - break; - default: - return -1; - } - - return nf_flow_nat_ipv6_l4proto(skb, ip6h, thoff, &addr, &new_addr); -} - -static int nf_flow_dnat_ipv6(const struct flow_offload *flow, - struct sk_buff *skb, struct ipv6hdr *ip6h, - unsigned int thoff, - enum flow_offload_tuple_dir dir) -{ - struct in6_addr addr, new_addr; - - switch (dir) { - case FLOW_OFFLOAD_DIR_ORIGINAL: - addr = ip6h->daddr; - new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_v6; - ip6h->daddr = new_addr; - break; - case FLOW_OFFLOAD_DIR_REPLY: - addr = ip6h->saddr; - new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_v6; - ip6h->saddr = new_addr; - break; - default: - return -1; - } - - return nf_flow_nat_ipv6_l4proto(skb, ip6h, thoff, &addr, &new_addr); -} - -static int nf_flow_nat_ipv6(const struct flow_offload *flow, - struct sk_buff *skb, - enum flow_offload_tuple_dir dir) -{ - struct ipv6hdr *ip6h = ipv6_hdr(skb); - unsigned int thoff = sizeof(*ip6h); - - if (flow->flags & FLOW_OFFLOAD_SNAT && - (nf_flow_snat_port(flow, skb, thoff, ip6h->nexthdr, dir) < 0 || - nf_flow_snat_ipv6(flow, skb, ip6h, thoff, dir) < 0)) - return -1; - if (flow->flags & FLOW_OFFLOAD_DNAT && - (nf_flow_dnat_port(flow, skb, thoff, ip6h->nexthdr, dir) < 0 || - nf_flow_dnat_ipv6(flow, skb, ip6h, thoff, dir) < 0)) - return -1; - - return 0; -} - -static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev, - struct flow_offload_tuple *tuple) -{ - struct flow_ports *ports; - struct ipv6hdr *ip6h; - unsigned int thoff; - - if (!pskb_may_pull(skb, sizeof(*ip6h))) - return -1; - - ip6h = ipv6_hdr(skb); - - if (ip6h->nexthdr != IPPROTO_TCP && - ip6h->nexthdr != IPPROTO_UDP) - return -1; - - thoff = sizeof(*ip6h); - if (!pskb_may_pull(skb, thoff + sizeof(*ports))) - return -1; - - ports = (struct flow_ports *)(skb_network_header(skb) + thoff); - - tuple->src_v6 = ip6h->saddr; - tuple->dst_v6 = ip6h->daddr; - tuple->src_port = ports->source; - tuple->dst_port = ports->dest; - tuple->l3proto = AF_INET6; - tuple->l4proto = ip6h->nexthdr; - tuple->iifidx = dev->ifindex; - - return 0; -} - -/* Based on ip_exceeds_mtu(). */ -static bool __nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu) -{ - if (skb->len <= mtu) - return false; - - if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) - return false; - - return true; -} - -static bool nf_flow_exceeds_mtu(struct sk_buff *skb, const struct rt6_info *rt) -{ - u32 mtu; - - mtu = ip6_dst_mtu_forward(&rt->dst); - if (__nf_flow_exceeds_mtu(skb, mtu)) - return true; - - return false; -} - -unsigned int -nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state) -{ - struct flow_offload_tuple_rhash *tuplehash; - struct nf_flowtable *flow_table = priv; - struct flow_offload_tuple tuple = {}; - enum flow_offload_tuple_dir dir; - struct flow_offload *flow; - struct net_device *outdev; - struct in6_addr *nexthop; - struct ipv6hdr *ip6h; - struct rt6_info *rt; - - if (skb->protocol != htons(ETH_P_IPV6)) - return NF_ACCEPT; - - if (nf_flow_tuple_ipv6(skb, state->in, &tuple) < 0) - return NF_ACCEPT; - - tuplehash = flow_offload_lookup(flow_table, &tuple); - if (tuplehash == NULL) - return NF_ACCEPT; - - outdev = dev_get_by_index_rcu(state->net, tuplehash->tuple.oifidx); - if (!outdev) - return NF_ACCEPT; - - dir = tuplehash->tuple.dir; - flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); - - rt = (struct rt6_info *)flow->tuplehash[dir].tuple.dst_cache; - if (unlikely(nf_flow_exceeds_mtu(skb, rt))) - return NF_ACCEPT; - - if (skb_try_make_writable(skb, sizeof(*ip6h))) - return NF_DROP; - - if (flow->flags & (FLOW_OFFLOAD_SNAT | FLOW_OFFLOAD_DNAT) && - nf_flow_nat_ipv6(flow, skb, dir) < 0) - return NF_DROP; - - flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT; - ip6h = ipv6_hdr(skb); - ip6h->hop_limit--; - - skb->dev = outdev; - nexthop = rt6_nexthop(rt, &flow->tuplehash[!dir].tuple.src_v6); - neigh_xmit(NEIGH_ND_TABLE, outdev, nexthop, skb); - - return NF_STOLEN; -} -EXPORT_SYMBOL_GPL(nf_flow_offload_ipv6_hook); static struct nf_flowtable_type flowtable_ipv6 = { .family = NFPROTO_IPV6, - .params = &nf_flow_offload_rhash_params, - .gc = nf_flow_offload_work_gc, + .init = nf_flow_table_init, .free = nf_flow_table_free, .hook = nf_flow_offload_ipv6_hook, .owner = THIS_MODULE, |