/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2011 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#include <stdint.h>
#include <string.h>
#include <netinet/in.h>

#include "patricia.h"
#include "locking.h"
#include "trie.h"
#include "ipv4.h"
#include "ipv6.h"

static struct patricia_node *tree = NULL;

static struct rwlock tree_lock;

void trie_addr_lookup(char *buff, size_t len, int ipv4, int *fd,
		      struct sockaddr_storage *addr, size_t *alen)
{
	void *data;
	size_t dlen;
	struct ipv4hdr *hdr4 = (void *) buff;
	struct ipv6hdr *hdr6 = (void *) buff;

	data = ipv4 ? (void *) &hdr4->h_daddr : (void *) &hdr6->daddr;
	dlen = ipv4 ? sizeof(hdr4->h_daddr) : sizeof(hdr6->daddr);

	if (unlikely((ipv4 && ((struct ipv4hdr *) buff)->h_version != 4) ||
		     (!ipv4 && ((struct ipv6hdr *) buff)->version  != 6))) {
		memset(addr, 0, sizeof(*addr));
		(*alen) = 0;
		(*fd) = -1;
		return;
	}

	rwlock_rd_lock(&tree_lock);
	(*fd) = ptree_search_data_exact(data, dlen, addr, alen, tree);
	rwlock_unlock(&tree_lock);
}

int trie_addr_maybe_update(char *buff, size_t len, int ipv4, int fd,
			   struct sockaddr_storage *addr, size_t alen)
{
	int ret;
	void *data;
	size_t dlen;
	struct ipv4hdr *hdr4 = (void *) buff;
	struct ipv6hdr *hdr6 = (void *) buff;

	data = ipv4 ? (void *) &hdr4->h_saddr : (void *) &hdr6->saddr;
	dlen = ipv4 ? sizeof(hdr4->h_saddr) : sizeof(hdr6->saddr);

	if (unlikely((ipv4 && ((struct ipv4hdr *) buff)->h_version != 4) ||
		     (!ipv4 && ((struct ipv6hdr *) buff)->version  != 6)))
		return -1;

	rwlock_wr_lock(&tree_lock);
	ret = ptree_add_entry(data, dlen, fd, addr, alen, &tree);
	rwlock_unlock(&tree_lock);

	return ret;
}

void trie_addr_remove(int fd)
{
	int found = 1;
	struct patricia_node *n = NULL;

	rwlock_wr_lock(&tree_lock);

	while (found) {
		ptree_get_key(fd, tree, &n);
		if (n) {
			ptree_del_entry(n->key, n->klen, &tree);
			n = NULL;
		} else
			found = 0;
	}

	rwlock_unlock(&tree_lock);
}

void trie_addr_remove_addr(struct sockaddr_storage *addr, size_t alen)
{
	int found = 1;
	struct patricia_node *n = NULL;

	rwlock_wr_lock(&tree_lock);

	while (found) {
		ptree_get_key_addr(addr, alen, tree, &n);
		if (n) {
			ptree_del_entry(n->key, n->klen, &tree);
			n = NULL;
		} else
			found = 0;
	}

	rwlock_unlock(&tree_lock);
}

void trie_init(void)
{
	rwlock_init(&tree_lock);
}

void trie_cleanup(void)
{
	rwlock_wr_lock(&tree_lock);
	ptree_free(tree);
	rwlock_unlock(&tree_lock);
	rwlock_destroy(&tree_lock);
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=1592c4d62a89bbca895c568d65ce290dfbc36ecc'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=1592c4d62a89bbca895c568d65ce290dfbc36ecc'>Documentation</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='1592c4d62a89bbca895c568d65ce290dfbc36ecc'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Trond Myklebust &lt;trond.myklebust@primarydata.com&gt;</td><td class='right'>2016-07-24 17:09:02 -0400</td></tr>
<tr><th>committer</th><td>Trond Myklebust &lt;trond.myklebust@primarydata.com&gt;</td><td class='right'>2016-07-24 17:09:02 -0400</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=1592c4d62a89bbca895c568d65ce290dfbc36ecc'>1592c4d62a89bbca895c568d65ce290dfbc36ecc</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation?id=1592c4d62a89bbca895c568d65ce290dfbc36ecc'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=1592c4d62a89bbca895c568d65ce290dfbc36ecc'>6b979bc02ded2ea7e644c34e6939ffbbb7ee001d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation?id=1592c4d62a89bbca895c568d65ce290dfbc36ecc'>Documentation</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=668f455dac57050e33a43ff5fe006f6cd947fc65'>668f455dac57050e33a43ff5fe006f6cd947fc65</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation?id=1592c4d62a89bbca895c568d65ce290dfbc36ecc&amp;id2=668f455dac57050e33a43ff5fe006f6cd947fc65'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=f0445670bd81cae9f46399d98fef5cd1622d9776'>f0445670bd81cae9f46399d98fef5cd1622d9776</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation?id=1592c4d62a89bbca895c568d65ce290dfbc36ecc&amp;id2=f0445670bd81cae9f46399d98fef5cd1622d9776'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'nfs-rdma'</div><div class='commit-msg'></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1592c4d62a89bbca895c568d65ce290dfbc36ecc'>Diffstat</a> (limited to 'Documentation')</div><table summary='diffstat' class='diffstat'>