/* * Rusty Russell (C)2000 -- This code is GPL. * Patrick McHardy (c) 2006-2012 */ /* Includes Intel Corporation's changes/modifications dated: 2014. Changed/modified portions - Copyright © 2014, Intel Corporation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "nf_internals.h" /* * Hook for nfnetlink_queue to register its queue handler. * We do this so that most of the NFQUEUE code can be modular. * * Once the queue is registered it must reinject all packets it * receives, no matter what. */ /* return EBUSY when somebody else is registered, return EEXIST if the * same handler is registered, return 0 in case of success. */ void nf_register_queue_handler(struct net *net, const struct nf_queue_handler *qh) { /* should never happen, we only have one queueing backend in kernel */ WARN_ON(rcu_access_pointer(net->nf.queue_handler)); rcu_assign_pointer(net->nf.queue_handler, qh); } EXPORT_SYMBOL(nf_register_queue_handler); /* The caller must flush their queue before this */ void nf_unregister_queue_handler(struct net *net) { RCU_INIT_POINTER(net->nf.queue_handler, NULL); } EXPORT_SYMBOL(nf_unregister_queue_handler); void nf_queue_entry_release_refs(struct nf_queue_entry *entry) { struct nf_hook_state *state = &entry->state; /* Release those devices we held, or Alexey will kill me. */ if (state->in) dev_put(state->in); if (state->out) dev_put(state->out); if (state->sk) sock_put(state->sk); #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) if (entry->skb->nf_bridge) { struct net_device *physdev; physdev = nf_bridge_get_physindev(entry->skb); if (physdev) dev_put(physdev); physdev = nf_bridge_get_physoutdev(entry->skb); if (physdev) dev_put(physdev); } #endif } EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs); /* Bump dev refs so they don't vanish while packet is out */ void nf_queue_entry_get_refs(struct nf_queue_entry *entry) { struct nf_hook_state *state = &entry->state; if (state->in) dev_hold(state->in); if (state->out) dev_hold(state->out); if (state->sk) sock_hold(state->sk); #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) if (entry->skb->nf_bridge) { struct net_device *physdev; physdev = nf_bridge_get_physindev(entry->skb); if (physdev) dev_hold(physdev); physdev = nf_bridge_get_physoutdev(entry->skb); if (physdev) dev_hold(physdev); } #endif } EXPORT_SYMBOL_GPL(nf_queue_entry_get_refs); void nf_queue_nf_hook_drop(struct net *net, const struct nf_hook_entry *entry) { const struct nf_queue_handler *qh; rcu_read_lock(); qh = rcu_dereference(net->nf.queue_handler); if (qh) qh->nf_hook_drop(net, entry); rcu_read_unlock(); } static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state, unsigned int queuenum) { int status = -ENOENT; struct nf_queue_entry *entry = NULL; const struct nf_afinfo *afinfo; const struct nf_queue_handler *qh; struct net *net = state->net; /* QUEUE == DROP if no one is waiting, to be safe. */ qh = rcu_dereference(net->nf.queue_handler); if (!qh) { status = -ESRCH; goto err; } afinfo = nf_get_afinfo(state->pf); if (!afinfo) goto err; entry = kmalloc(sizeof(*entry) + afinfo->route_key_size, GFP_ATOMIC); if (!entry) { status = -ENOMEM; goto err; } *entry = (struct nf_queue_entry) { .skb = skb, .state = *state, .size = sizeof(*entry) + afinfo->route_key_size, }; nf_queue_entry_get_refs(entry); skb_dst_force(skb); afinfo->saveroute(skb, entry); status = qh->outfn(entry, queuenum); if (status < 0) { nf_queue_entry_release_refs(entry); goto err; } return 0; err: kfree(entry); return status; } /* Packets leaving via this function must come back through nf_reinject(). */ int nf_queue(struct sk_buff *skb, struct nf_hook_state *state, struct nf_hook_entry **entryp, unsigned int verdict) { struct nf_hook_entry *entry = *entryp; int ret; RCU_INIT_POINTER(state->hook_entries, entry); ret = __nf_queue(skb, state, verdict >> NF_VERDICT_QBITS); if (ret < 0) { if (ret == -ESRCH && (verdict & NF_VERDICT_FLAG_QUEUE_BYPASS)) { *entryp = rcu_dereference(entry->next); return 1; } kfree_skb(skb); } return 0; } void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict) { struct nf_hook_entry *hook_entry; struct sk_buff *skb = entry->skb; const struct nf_afinfo *afinfo; struct nf_hook_ops *elem; int err; hook_entry = rcu_dereference(entry->state.hook_entries); elem = &hook_entry->ops; nf_queue_entry_release_refs(entry); /* Continue traversal iff userspace said ok... */ if (verdict == NF_REPEAT) verdict = elem->hook(elem->priv, skb, &entry->state); if (verdict == NF_ACCEPT) { afinfo = nf_get_afinfo(entry->state.pf); if (!afinfo || afinfo->reroute(entry->state.net, skb, entry) < 0) verdict = NF_DROP; } entry->state.thresh = INT_MIN; if (verdict == NF_ACCEPT) { hook_entry = rcu_dereference(hook_entry->next); if (hook_entry) next_hook: verdict = nf_iterate(skb, &entry->state, &hook_entry); } switch (verdict & NF_VERDICT_MASK) { case NF_ACCEPT: case NF_STOP: okfn: local_bh_disable(); entry->state.okfn(entry->state.net, entry->state.sk, skb); local_bh_enable(); break; case NF_QUEUE: err = nf_queue(skb, &entry->state, &hook_entry, verdict); if (err == 1) { if (hook_entry) goto next_hook; goto okfn; } break; case NF_STOLEN: break; default: #ifdef CONFIG_TI_PACKET_PROCESSOR { int skip_pp_discard=0; struct ethhdr* ptr_ethhdr = NULL; #define MAC_ISMULTICAST( pa, hw ) ( ((pa)->hw[0] & 0x01) ) #define MAC_ISBROADCAST( pa, hw ) ( ~0xFF ==( (~(pa)->hw[0]) | \ (~(pa)->hw[1]) | \ (~(pa)->hw[2]) | \ (~(pa)->hw[3]) | \ (~(pa)->hw[4]) | \ (~(pa)->hw[5]) )) ptr_ethhdr = eth_hdr(skb); if ( ptr_ethhdr) { /* Check if the package is the multicast type, but not a broadcast */ if ( ( ! (MAC_ISBROADCAST (ptr_ethhdr, h_dest)) ) && ( MAC_ISMULTICAST (ptr_ethhdr, h_dest)) ) { skip_pp_discard=1; printk(KERN_DEBUG "NF_DROP :Multicast pkg, Do not create PP drop session\n" ); } } if ( ! skip_pp_discard ) { ti_hil_pp_event (TI_CT_NETFILTER_DISCARD_PKT, (void *)skb); } } #endif //CONFIG_TI_PACKET_PROCESSOR kfree_skb(skb); } kfree(entry); } EXPORT_SYMBOL(nf_reinject);