Release 4.11 net/ipv4/xfrm4_policy.c

/*
 * xfrm4_policy.c
 *
 * Changes:
 *      Kazunori MIYAZAWA @USAGI
 *      YOSHIFUJI Hideaki @USAGI
 *              Split up af-specific portion
 *
 */

#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/inetdevice.h>
#include <linux/if_tunnel.h>
#include <net/dst.h>
#include <net/xfrm.h>
#include <net/ip.h>
#include <net/l3mdev.h>



static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
					    int tos, int oif,
					    const xfrm_address_t *saddr,
					    const xfrm_address_t *daddr)
{
	struct rtable *rt;

	memset(fl4, 0, sizeof(*fl4));
	fl4->daddr = daddr->a4;
	fl4->flowi4_tos = tos;
	fl4->flowi4_oif = l3mdev_master_ifindex_by_index(net, oif);
	if (saddr)
		fl4->saddr = saddr->a4;

	fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF;

	rt = __ip_route_output_key(net, fl4);
	if (!IS_ERR(rt))
		return &rt->dst;

	return ERR_CAST(rt);
}

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20
16.13%
3
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Hideaki Yoshifuji / 吉藤英明
11
8.87%
1
8.33%
Alexey Dobriyan
6
4.84%
1
8.33%
Changli Gao
2
1.61%
1
8.33%
Denis V. Lunev
1
0.81%
1
8.33%
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124
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12
100.00%



static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif,
					  const xfrm_address_t *saddr,
					  const xfrm_address_t *daddr)
{
	struct flowi4 fl4;

	return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr);
}

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50
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100.00%



static int xfrm4_get_saddr(struct net *net, int oif,
			   xfrm_address_t *saddr, xfrm_address_t *daddr)
{
	struct dst_entry *dst;
	struct flowi4 fl4;

	dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr);
	if (IS_ERR(dst))
		return -EHOSTUNREACH;

	saddr->a4 = fl4.saddr;
	dst_release(dst);
	return 0;
}

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21
27.63%
1
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David S. Miller
9
11.84%
1
16.67%
Alexey Dobriyan
7
9.21%
2
33.33%
David Ahern
5
6.58%
1
16.67%
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76
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6
100.00%



static int xfrm4_get_tos(const struct flowi *fl)
{
	return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */
}

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9
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6
25.00%
2
33.33%
David S. Miller
6
25.00%
2
33.33%
Ulrich Weber
3
12.50%
1
16.67%
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24
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6
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static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
			   int nfheader_len)
{
	return 0;
}

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22
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static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
			  const struct flowi *fl)
{
	struct rtable *rt = (struct rtable *)xdst->route;
	const struct flowi4 *fl4 = &fl->u.ip4;

	xdst->u.rt.rt_iif = fl4->flowi4_iif;

	xdst->u.dst.dev = dev;
	dev_hold(dev);

	/* Sheit... I remember I did this right. Apparently,
         * it was magically lost, so this code needs audit */
	xdst->u.rt.rt_is_input = rt->rt_is_input;
	xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
					      RTCF_LOCAL);
	xdst->u.rt.rt_type = rt->rt_type;
	xdst->u.rt.rt_gateway = rt->rt_gateway;
	xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
	xdst->u.rt.rt_pmtu = rt->rt_pmtu;
	xdst->u.rt.rt_table_id = rt->rt_table_id;
	INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);

	return 0;
}

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46.67%
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55
29.89%
1
6.67%
Herbert Xu
40
21.74%
4
26.67%
David Ahern
12
6.52%
1
6.67%
Julian Anastasov
12
6.52%
1
6.67%
Zheng Yan
8
4.35%
1
6.67%
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184
100.00%
15
100.00%


static void

_decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
{
	const struct iphdr *iph = ip_hdr(skb);
	u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
	struct flowi4 *fl4 = &fl->u.ip4;
	int oif = 0;

	if (skb_dst(skb))
		oif = skb_dst(skb)->dev->ifindex;

	memset(fl4, 0, sizeof(struct flowi4));
	fl4->flowi4_mark = skb->mark;
	fl4->flowi4_oif = reverse ? skb->skb_iif : oif;

	if (!ip_is_fragment(iph)) {
		switch (iph->protocol) {
		case IPPROTO_UDP:
		case IPPROTO_UDPLITE:
		case IPPROTO_TCP:
		case IPPROTO_SCTP:
		case IPPROTO_DCCP:
			if (xprth + 4 < skb->data ||
			    pskb_may_pull(skb, xprth + 4 - skb->data)) {
				__be16 *ports;

				xprth = skb_network_header(skb) + iph->ihl * 4;
				ports = (__be16 *)xprth;

				fl4->fl4_sport = ports[!!reverse];
				fl4->fl4_dport = ports[!reverse];
			}
			break;

		case IPPROTO_ICMP:
			if (xprth + 2 < skb->data ||
			    pskb_may_pull(skb, xprth + 2 - skb->data)) {
				u8 *icmp;

				xprth = skb_network_header(skb) + iph->ihl * 4;
				icmp = xprth;

				fl4->fl4_icmp_type = icmp[0];
				fl4->fl4_icmp_code = icmp[1];
			}
			break;

		case IPPROTO_ESP:
			if (xprth + 4 < skb->data ||
			    pskb_may_pull(skb, xprth + 4 - skb->data)) {
				__be32 *ehdr;

				xprth = skb_network_header(skb) + iph->ihl * 4;
				ehdr = (__be32 *)xprth;

				fl4->fl4_ipsec_spi = ehdr[0];
			}
			break;

		case IPPROTO_AH:
			if (xprth + 8 < skb->data ||
			    pskb_may_pull(skb, xprth + 8 - skb->data)) {
				__be32 *ah_hdr;

				xprth = skb_network_header(skb) + iph->ihl * 4;
				ah_hdr = (__be32 *)xprth;

				fl4->fl4_ipsec_spi = ah_hdr[1];
			}
			break;

		case IPPROTO_COMP:
			if (xprth + 4 < skb->data ||
			    pskb_may_pull(skb, xprth + 4 - skb->data)) {
				__be16 *ipcomp_hdr;

				xprth = skb_network_header(skb) + iph->ihl * 4;
				ipcomp_hdr = (__be16 *)xprth;

				fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
			}
			break;

		case IPPROTO_GRE:
			if (xprth + 12 < skb->data ||
			    pskb_may_pull(skb, xprth + 12 - skb->data)) {
				__be16 *greflags;
				__be32 *gre_hdr;

				xprth = skb_network_header(skb) + iph->ihl * 4;
				greflags = (__be16 *)xprth;
				gre_hdr = (__be32 *)xprth;

				if (greflags[0] & GRE_KEY) {
					if (greflags[0] & GRE_CSUM)
						gre_hdr++;
					fl4->fl4_gre_key = gre_hdr[1];
				}
			}
			break;

		default:
			fl4->fl4_ipsec_spi = 0;
			break;
		}
	}
	fl4->flowi4_proto = iph->protocol;
	fl4->daddr = reverse ? iph->saddr : iph->daddr;
	fl4->saddr = reverse ? iph->daddr : iph->saddr;
	fl4->flowi4_tos = iph->tos;
}

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188
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1
3.85%
Steffen Klassert
175
27.73%
4
15.38%
Timo Teräs
65
10.30%
1
3.85%
David S. Miller
42
6.66%
2
7.69%
Masahide Nakamura
39
6.18%
1
3.85%
James Morris
39
6.18%
1
3.85%
Herbert Xu
37
5.86%
3
11.54%
Al Viro
8
1.27%
2
7.69%
Wei Yongjun
8
1.27%
1
3.85%
David Ahern
8
1.27%
2
7.69%
Arnaldo Carvalho de Melo
6
0.95%
2
7.69%
Peter Kosyh
6
0.95%
1
3.85%
Gerrit Renker
3
0.48%
1
3.85%
Patrick McHardy
3
0.48%
1
3.85%
Paul Gortmaker
2
0.32%
1
3.85%
Alexey Dobriyan
1
0.16%
1
3.85%
Eric Dumazet
1
0.16%
1
3.85%
Total
631
100.00%
26
100.00%



static inline int xfrm4_garbage_collect(struct dst_ops *ops)
{
	struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);

	xfrm_garbage_collect_deferred(net);
	return (dst_entries_get_slow(ops) > ops->gc_thresh * 2);
}

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23
47.92%
2
33.33%
Hideaki Yoshifuji / 吉藤英明
19
39.58%
1
16.67%
Daniel Lezcano
4
8.33%
1
16.67%
Eric Dumazet
1
2.08%
1
16.67%
Florian Westphal
1
2.08%
1
16.67%
Total
48
100.00%
6
100.00%



static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
			      struct sk_buff *skb, u32 mtu)
{
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
	struct dst_entry *path = xdst->route;

	path->ops->update_pmtu(path, sk, skb, mtu);
}

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32
53.33%
1
33.33%
David S. Miller
14
23.33%
1
33.33%
Herbert Xu
14
23.33%
1
33.33%
Total
60
100.00%
3
100.00%



static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
			   struct sk_buff *skb)
{
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
	struct dst_entry *path = xdst->route;

	path->ops->redirect(path, sk, skb);
}

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static void xfrm4_dst_destroy(struct dst_entry *dst)
{
	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;

	dst_destroy_metrics_generic(dst);

	xfrm_dst_destroy(xdst);
}

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33
100.00%
2
100.00%



static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
			     int unregister)
{
	if (!unregister)
		return;

	xfrm_dst_ifdown(dst, dev);
}

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static struct dst_ops xfrm4_dst_ops_template = {
	.family =		AF_INET,
	.gc =			xfrm4_garbage_collect,
	.update_pmtu =		xfrm4_update_pmtu,
	.redirect =		xfrm4_redirect,
	.cow_metrics =		dst_cow_metrics_generic,
	.destroy =		xfrm4_dst_destroy,
	.ifdown =		xfrm4_dst_ifdown,
	.local_out =		__ip_local_out,
	.gc_thresh =		INT_MAX,
};


static const struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
	.dst_ops =		&xfrm4_dst_ops_template,
	.dst_lookup =		xfrm4_dst_lookup,
	.get_saddr =		xfrm4_get_saddr,
	.decode_session =	_decode_session4,
	.get_tos =		xfrm4_get_tos,
	.init_path =		xfrm4_init_path,
	.fill_dst =		xfrm4_fill_dst,
	.blackhole_route =	ipv4_blackhole_route,
};

#ifdef CONFIG_SYSCTL

static struct ctl_table xfrm4_policy_table[] = {
	{
		.procname       = "xfrm4_gc_thresh",
		.data           = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
		.maxlen         = sizeof(int),
		.mode           = 0644,
		.proc_handler   = proc_dointvec,
        },
	{ }
};



static __net_init int xfrm4_net_sysctl_init(struct net *net)
{
	struct ctl_table *table;
	struct ctl_table_header *hdr;

	table = xfrm4_policy_table;
	if (!net_eq(net, &init_net)) {
		table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
		if (!table)
			goto err_alloc;

		table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
	}

	hdr = register_net_sysctl(net, "net/ipv4", table);
	if (!hdr)
		goto err_reg;

	net->ipv4.xfrm4_hdr = hdr;
	return 0;

err_reg:
	if (!net_eq(net, &init_net))
		kfree(table);
err_alloc:
	return -ENOMEM;
}

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Neil Horman
4
3.05%
1
25.00%
Dan Streetman
1
0.76%
1
25.00%
Arnd Bergmann
1
0.76%
1
25.00%
Total
131
100.00%
4
100.00%



static __net_exit void xfrm4_net_sysctl_exit(struct net *net)
{
	struct ctl_table *table;

	if (!net->ipv4.xfrm4_hdr)
		return;

	table = net->ipv4.xfrm4_hdr->ctl_table_arg;
	unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
	if (!net_eq(net, &init_net))
		kfree(table);
}
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Ian Morris
1
1.61%
1
25.00%
Dan Streetman
1
1.61%
1
25.00%
Arnd Bergmann
1
1.61%
1
25.00%
Total
62
100.00%
4
100.00%

#else /* CONFIG_SYSCTL */


static inline int xfrm4_net_sysctl_init(struct net *net)
{
	return 0;
}

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6.67%
1
50.00%
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15
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100.00%



static inline void xfrm4_net_sysctl_exit(struct net *net)
{
}
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9.09%
1
50.00%
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11
100.00%
2
100.00%

#endif



static int __net_init xfrm4_net_init(struct net *net)
{
	int ret;

	memcpy(&net->xfrm.xfrm4_dst_ops, &xfrm4_dst_ops_template,
	       sizeof(xfrm4_dst_ops_template));
	ret = dst_entries_init(&net->xfrm.xfrm4_dst_ops);
	if (ret)
		return ret;

	ret = xfrm4_net_sysctl_init(net);
	if (ret)
		dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);

	return ret;
}

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1
100.00%



static void __net_exit xfrm4_net_exit(struct net *net)
{
	xfrm4_net_sysctl_exit(net);
	dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
}

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1
100.00%


static struct pernet_operations __net_initdata xfrm4_net_ops = {
	.init	= xfrm4_net_init,
	.exit	= xfrm4_net_exit,
};



static void __init xfrm4_policy_init(void)
{
	xfrm_policy_register_afinfo(&xfrm4_policy_afinfo, AF_INET);
}

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14
82.35%
1
33.33%
Florian Westphal
2
11.76%
1
33.33%
Patrick McHardy
1
5.88%
1
33.33%
Total
17
100.00%
3
100.00%



void __init xfrm4_init(void)
{
	xfrm4_state_init();
	xfrm4_policy_init();
	xfrm4_protocol_init();
	register_pernet_subsys(&xfrm4_net_ops);
}

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7
30.43%
1
16.67%
Alexey Dobriyan
6
26.09%
1
16.67%
Neil Horman
4
17.39%
1
16.67%
Steffen Klassert
4
17.39%
2
33.33%
Michal Kubeček
2
8.70%
1
16.67%
Total
23
100.00%
6
100.00%

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Tokens
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CommitProp
Hideaki Yoshifuji / 吉藤英明
388
20.42%
2
2.44%
David S. Miller
299
15.74%
17
20.73%
Herbert Xu
247
13.00%
12
14.63%
Michal Kubeček
203
10.68%
1
1.22%
Steffen Klassert
180
9.47%
7
8.54%
Dan Streetman
136
7.16%
1
1.22%
Timo Teräs
68
3.58%
1
1.22%
Masahide Nakamura
66
3.47%
2
2.44%
David Ahern
53
2.79%
7
8.54%
Neil Horman
52
2.74%
1
1.22%
Alexey Dobriyan
47
2.47%
5
6.10%
Patrick McHardy
45
2.37%
3
3.66%
James Morris
39
2.05%
1
1.22%
Julian Anastasov
12
0.63%
1
1.22%
Zheng Yan
8
0.42%
1
1.22%
Al Viro
8
0.42%
2
2.44%
Wei Yongjun
8
0.42%
1
1.22%
Arnaldo Carvalho de Melo
6
0.32%
2
2.44%
Peter Kosyh
6
0.32%
1
1.22%
Florian Westphal
4
0.21%
3
3.66%
Daniel Lezcano
4
0.21%
1
1.22%
Arnd Bergmann
4
0.21%
1
1.22%
Gerrit Renker
3
0.16%
1
1.22%
Ulrich Weber
3
0.16%
1
1.22%
Randy Dunlap
3
0.16%
1
1.22%
Changli Gao
2
0.11%
1
1.22%
Eric Dumazet
2
0.11%
2
2.44%
Paul Gortmaker
2
0.11%
1
1.22%
Denis V. Lunev
1
0.05%
1
1.22%
Ian Morris
1
0.05%
1
1.22%
Total
1900
100.00%
82
100.00%
Directory: net/ipv4

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