cregit-Linux how code gets into the kernel

Release 4.8 net/netfilter/nf_queue.c

Directory: net/netfilter
 * Rusty Russell (C)2000 -- This code is GPL.
 * Patrick McHardy (c) 2006-2012

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <linux/netfilter_bridge.h>
#include <linux/seq_file.h>
#include <linux/rcupdate.h>
#include <net/protocol.h>
#include <net/netfilter/nf_queue.h>
#include <net/dst.h>

#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); }


harald welteharald welte1435.00%225.00%
eric w. biedermaneric w. biederman1332.50%112.50%
eric dumazeteric dumazet512.50%225.00%
florian westphalflorian westphal410.00%112.50%
yasuyuki kozakaiyasuyuki kozakai37.50%112.50%
patrick mchardypatrick mchardy12.50%112.50%

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); }


harald welteharald welte838.10%120.00%
eric w. biedermaneric w. biederman838.10%120.00%
yasuyuki kozakaiyasuyuki kozakai314.29%120.00%
stephen hemmingerstephen hemminger14.76%120.00%
florian westphalflorian westphal14.76%120.00%

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 }


patrick mchardypatrick mchardy6453.78%120.00%
david s. millerdavid s. miller2924.37%240.00%
florian westphalflorian westphal2117.65%120.00%
pablo neira ayusopablo neira ayuso54.20%120.00%

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 }


florian westphalflorian westphal8471.19%350.00%
david s. millerdavid s. miller2924.58%233.33%
pablo neira ayusopablo neira ayuso54.24%116.67%

void nf_queue_nf_hook_drop(struct net *net, struct nf_hook_ops *ops) { const struct nf_queue_handler *qh; rcu_read_lock(); qh = rcu_dereference(net->nf.queue_handler); if (qh) qh->nf_hook_drop(net, ops); rcu_read_unlock(); }


eric w. biedermaneric w. biederman4690.20%266.67%
pablo neira ayusopablo neira ayuso59.80%133.33%

/* * Any packet that leaves via this function must come back * through nf_reinject(). */
int nf_queue(struct sk_buff *skb, struct nf_hook_ops *elem, 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, .elem = elem, .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; }


harald welteharald welte8938.53%29.09%
patrick mchardypatrick mchardy6628.57%731.82%
florian westphalflorian westphal3816.45%627.27%
eric w. biedermaneric w. biederman135.63%14.55%
yasuyuki kozakaiyasuyuki kozakai114.76%14.55%
david s. millerdavid s. miller73.03%29.09%
eric dumazeteric dumazet52.16%14.55%
lucas de marchilucas de marchi10.43%14.55%
michael wangmichael wang10.43%14.55%

void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict) { struct sk_buff *skb = entry->skb; struct nf_hook_ops *elem = entry->elem; const struct nf_afinfo *afinfo; int err; 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->; if (!afinfo || afinfo->reroute(entry->, skb, entry) < 0) verdict = NF_DROP; } entry->state.thresh = INT_MIN; if (verdict == NF_ACCEPT) { next_hook: verdict = nf_iterate(entry->state.hook_list, skb, &entry->state, &elem); } switch (verdict & NF_VERDICT_MASK) { case NF_ACCEPT: case NF_STOP: local_bh_disable(); entry->state.okfn(entry->, entry->, skb); local_bh_enable(); break; case NF_QUEUE: err = nf_queue(skb, elem, &entry->state, verdict >> NF_VERDICT_QBITS); if (err < 0) { if (err == -ESRCH && (verdict & NF_VERDICT_FLAG_QUEUE_BYPASS)) goto next_hook; kfree_skb(skb); } break; case NF_STOLEN: break; default: kfree_skb(skb); } kfree(entry); }


harald welteharald welte9837.26%14.35%
patrick mchardypatrick mchardy7227.38%730.43%
florian westphalflorian westphal4717.87%626.09%
david s. millerdavid s. miller249.13%313.04%
eric w. biedermaneric w. biederman134.94%313.04%
michael wangmichael wang51.90%14.35%
eric dumazeteric dumazet31.14%14.35%
julian anastasovjulian anastasov10.38%14.35%


Overall Contributors

harald welteharald welte25327.62%36.25%
florian westphalflorian westphal21022.93%1122.92%
patrick mchardypatrick mchardy21022.93%1122.92%
eric w. biedermaneric w. biederman9310.15%510.42%
david s. millerdavid s. miller899.72%48.33%
yasuyuki kozakaiyasuyuki kozakai171.86%12.08%
eric dumazeteric dumazet161.75%48.33%
pablo neira ayusopablo neira ayuso151.64%24.17%
michael wangmichael wang60.66%24.17%
tejun heotejun heo30.33%12.08%
hideaki yoshifujihideaki yoshifuji10.11%12.08%
stephen hemmingerstephen hemminger10.11%12.08%
julian anastasovjulian anastasov10.11%12.08%
lucas de marchilucas de marchi10.11%12.08%
Directory: net/netfilter
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