971502d77f
Replace NF_HOOK() based invocation of the netfilter hooks with a private copy of nf_hook_slow(). This copy has one difference: it can return the rx handler value expected by the stack, i.e. RX_HANDLER_CONSUMED or RX_HANDLER_PASS. This is needed by the next patch to invoke the ebtables "broute" table via the standard netfilter hooks rather than the custom "br_should_route_hook" indirection that is used now. When the skb is to be "brouted", we must return RX_HANDLER_PASS from the bridge rx input handler, but there is no way to indicate this via NF_HOOK(), unless perhaps by some hack such as exposing bridge_cb in the netfilter core or a percpu flag. text data bss dec filename 3369 56 0 3425 net/bridge/br_input.o.before 3458 40 0 3498 net/bridge/br_input.o.after This allows removal of the "br_should_route_hook" in the next patch. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NF_QUEUE_H
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#define _NF_QUEUE_H
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/jhash.h>
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/* Each queued (to userspace) skbuff has one of these. */
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struct nf_queue_entry {
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struct list_head list;
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struct sk_buff *skb;
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unsigned int id;
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unsigned int hook_index; /* index in hook_entries->hook[] */
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struct nf_hook_state state;
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u16 size; /* sizeof(entry) + saved route keys */
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/* extra space to store route keys */
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};
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#define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry))
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/* Packet queuing */
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struct nf_queue_handler {
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int (*outfn)(struct nf_queue_entry *entry,
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unsigned int queuenum);
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void (*nf_hook_drop)(struct net *net);
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};
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void nf_register_queue_handler(struct net *net, const struct nf_queue_handler *qh);
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void nf_unregister_queue_handler(struct net *net);
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void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict);
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void nf_queue_entry_get_refs(struct nf_queue_entry *entry);
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void nf_queue_entry_release_refs(struct nf_queue_entry *entry);
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static inline void init_hashrandom(u32 *jhash_initval)
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{
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while (*jhash_initval == 0)
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*jhash_initval = prandom_u32();
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}
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static inline u32 hash_v4(const struct iphdr *iph, u32 initval)
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{
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/* packets in either direction go into same queue */
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if ((__force u32)iph->saddr < (__force u32)iph->daddr)
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return jhash_3words((__force u32)iph->saddr,
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(__force u32)iph->daddr, iph->protocol, initval);
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return jhash_3words((__force u32)iph->daddr,
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(__force u32)iph->saddr, iph->protocol, initval);
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}
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static inline u32 hash_v6(const struct ipv6hdr *ip6h, u32 initval)
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{
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u32 a, b, c;
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if ((__force u32)ip6h->saddr.s6_addr32[3] <
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(__force u32)ip6h->daddr.s6_addr32[3]) {
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a = (__force u32) ip6h->saddr.s6_addr32[3];
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b = (__force u32) ip6h->daddr.s6_addr32[3];
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} else {
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b = (__force u32) ip6h->saddr.s6_addr32[3];
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a = (__force u32) ip6h->daddr.s6_addr32[3];
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}
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if ((__force u32)ip6h->saddr.s6_addr32[1] <
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(__force u32)ip6h->daddr.s6_addr32[1])
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c = (__force u32) ip6h->saddr.s6_addr32[1];
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else
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c = (__force u32) ip6h->daddr.s6_addr32[1];
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return jhash_3words(a, b, c, initval);
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}
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static inline u32 hash_bridge(const struct sk_buff *skb, u32 initval)
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{
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struct ipv6hdr *ip6h, _ip6h;
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struct iphdr *iph, _iph;
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switch (eth_hdr(skb)->h_proto) {
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case htons(ETH_P_IP):
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iph = skb_header_pointer(skb, skb_network_offset(skb),
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sizeof(*iph), &_iph);
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if (iph)
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return hash_v4(iph, initval);
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break;
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case htons(ETH_P_IPV6):
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ip6h = skb_header_pointer(skb, skb_network_offset(skb),
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sizeof(*ip6h), &_ip6h);
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if (ip6h)
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return hash_v6(ip6h, initval);
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break;
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}
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return 0;
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}
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static inline u32
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nfqueue_hash(const struct sk_buff *skb, u16 queue, u16 queues_total, u8 family,
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u32 initval)
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{
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switch (family) {
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case NFPROTO_IPV4:
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queue += reciprocal_scale(hash_v4(ip_hdr(skb), initval),
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queues_total);
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break;
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case NFPROTO_IPV6:
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queue += reciprocal_scale(hash_v6(ipv6_hdr(skb), initval),
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queues_total);
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break;
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case NFPROTO_BRIDGE:
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queue += reciprocal_scale(hash_bridge(skb, initval),
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queues_total);
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break;
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}
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return queue;
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}
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int nf_queue(struct sk_buff *skb, struct nf_hook_state *state,
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const struct nf_hook_entries *entries, unsigned int index,
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unsigned int verdict);
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#endif /* _NF_QUEUE_H */
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