1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
From 81d38c4a32e059ad7835f7dc254e7627642afbe9 Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <stephen@networkplumber.org>
Date: Mon, 29 Apr 2013 18:50:15 -0700
Subject: [PATCH] VyOS: Add linkstate IP device attribute
Backport of earlier Vyatta patch.
(cherry picked from commit 7c5a851086686be14ae937c80d6cee34814dbefc)
---
Documentation/networking/ip-sysctl.rst | 11 +++++++++++
include/linux/inetdevice.h | 1 +
include/linux/ipv6.h | 1 +
include/uapi/linux/ip.h | 1 +
include/uapi/linux/ipv6.h | 1 +
net/ipv4/devinet.c | 1 +
net/ipv6/addrconf.c | 8 ++++++++
net/ipv6/route.c | 10 ++++++++++
8 files changed, 34 insertions(+)
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index a66054d0763a..53440098fa98 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -1734,6 +1734,17 @@ src_valid_mark - BOOLEAN
Default value is 0.
+link_filter - INTEGER
+ 0 - Allow packets to be received for the address on this interface
+ even if interface is disabled or no carrier.
+ 1 - Ignore packets received if interface associated with the incoming
+ address is down.
+ 2 - Ignore packets received if interface associated with the incoming
+ address is down or has no carrier.
+
+ Default value is 0. Note that some distributions enable it
+ in startup scripts.
+
arp_filter - BOOLEAN
- 1 - Allows you to have multiple network interfaces on the same
subnet, and have the ARPs for each interface be answered
diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
index ddb27fc0ee8c..8ee3191d9558 100644
--- a/include/linux/inetdevice.h
+++ b/include/linux/inetdevice.h
@@ -137,6 +137,7 @@ static inline void ipv4_devconf_setall(struct in_device *in_dev)
#define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
#define IN_DEV_ARP_EVICT_NOCARRIER(in_dev) IN_DEV_ANDCONF((in_dev), \
ARP_EVICT_NOCARRIER)
+#define IN_DEV_LINKFILTER(in_dev) IN_DEV_MAXCONF((in_dev), LINKFILTER)
struct in_ifaddr {
struct hlist_node hash;
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index af8a771a053c..ece8ac89d317 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -84,6 +84,7 @@ struct ipv6_devconf {
__u8 ndisc_evict_nocarrier;
struct ctl_table_header *sysctl_header;
+ __s32 link_filter;
};
struct ipv6_params {
diff --git a/include/uapi/linux/ip.h b/include/uapi/linux/ip.h
index 283dec7e3645..8067941a635e 100644
--- a/include/uapi/linux/ip.h
+++ b/include/uapi/linux/ip.h
@@ -173,6 +173,7 @@ enum
IPV4_DEVCONF_DROP_GRATUITOUS_ARP,
IPV4_DEVCONF_BC_FORWARDING,
IPV4_DEVCONF_ARP_EVICT_NOCARRIER,
+ IPV4_DEVCONF_LINKFILTER,
__IPV4_DEVCONF_MAX
};
diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
index cf592d7b630f..e8915701aa73 100644
--- a/include/uapi/linux/ipv6.h
+++ b/include/uapi/linux/ipv6.h
@@ -199,6 +199,7 @@ enum {
DEVCONF_NDISC_EVICT_NOCARRIER,
DEVCONF_ACCEPT_UNTRACKED_NA,
DEVCONF_ACCEPT_RA_MIN_LFT,
+ DEVCONF_LINK_FILTER,
DEVCONF_MAX
};
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index bc74f131fe4d..9cdd5b50f9b2 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -2595,6 +2595,7 @@ static struct devinet_sysctl_table {
"route_localnet"),
DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
"drop_unicast_in_l2_multicast"),
+ DEVINET_SYSCTL_RW_ENTRY(LINKFILTER, "link_filter"),
},
};
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 9dfbda164e8c..2786c8ea451a 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5656,6 +5656,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
array[DEVCONF_ACCEPT_RA_MIN_LFT] = cnf->accept_ra_min_lft;
+ array[DEVCONF_LINK_FILTER] = cnf->link_filter;
}
static inline size_t inet6_ifla6_size(void)
@@ -7085,6 +7086,13 @@ static const struct ctl_table addrconf_sysctl[] = {
.extra1 = (void *)SYSCTL_ZERO,
.extra2 = (void *)SYSCTL_ONE,
},
+ {
+ .procname = "link_filter",
+ .data = &ipv6_devconf.link_filter,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
{
.procname = "ioam6_id",
.data = &ipv6_devconf.ioam6_id,
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index c48eaa7c2340..309a93100c34 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -677,6 +677,14 @@ static inline void rt6_probe(struct fib6_nh *fib6_nh)
}
#endif
+static inline int rt6_link_filter(const struct fib6_nh *nh)
+{
+ const struct net_device *dev = nh->fib_nh_dev;
+ int linkf = __in6_dev_get(dev)->cnf.link_filter;
+ return (linkf && !netif_running(dev))
+ || (linkf > 1 && !netif_carrier_ok(dev));
+}
+
/*
* Default Router Selection (RFC 2461 6.3.6)
*/
@@ -718,6 +726,8 @@ static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
if (!m && (strict & RT6_LOOKUP_F_IFACE))
return RT6_NUD_FAIL_HARD;
+ if (rt6_link_filter(nh))
+ return -1;
#ifdef CONFIG_IPV6_ROUTER_PREF
m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;
#endif
--
2.39.2
|
