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mpls: allow TTL propagation from IP packets to be configured

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Allow TTL propagation from IP packets to MPLS packets to be
configured. Add a new optional LWT attribute, MPLS_IPTUNNEL_TTL, which
allows the TTL to be set in the resulting MPLS packet, with the value
of 0 having the semantics of enabling propagation of the TTL from the
IP header (i.e. non-zero values disable propagation).

Also allow the configuration to be overridden globally by reusing the
same sysctl to control whether the TTL is propagated from IP packets
into the MPLS header. If the per-LWT attribute is set then it
overrides the global configuration. If the TTL isn't propagated then a
default TTL value is used which can be configured via a new sysctl,
"net.mpls.default_ttl". This is kept separate from the configuration
of whether IP TTL propagation is enabled as it can be used in the
future when non-IP payloads are supported (i.e. where there is no
payload TTL that can be propagated).

Signed-off-by: Robert Shearman <rshearma@brocade.com>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
Tested-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Robert Shearman 2017-03-10 20:43:25 +00:00 committed by David S. Miller
parent 5b441ac878
commit a59166e470
6 changed files with 84 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/networking/mpls-sysctl.txt
View File

@ -30,6 +30,14 @@ ip_ttl_propagate - BOOL
0 - disabled / RFC 3443 [Short] Pipe Model
1 - enabled / RFC 3443 Uniform Model (default)
default_ttl - BOOL
Default TTL value to use for MPLS packets where it cannot be
propagated from an IP header, either because one isn't present
or ip_ttl_propagate has been disabled.
Possible values: 1 - 255
Default: 255
conf/<interface>/input - BOOL
Control whether packets can be input on this interface.

2
include/net/mpls_iptunnel.h
View File

@ -19,6 +19,8 @@
struct mpls_iptunnel_encap {
u32 label[MAX_NEW_LABELS];
u8 labels;
u8 ttl_propagate;
u8 default_ttl;
};
static inline struct mpls_iptunnel_encap *mpls_lwtunnel_encap(struct lwtunnel_state *lwtstate)

1
include/net/netns/mpls.h
View File

@ -10,6 +10,7 @@ struct ctl_table_header;
struct netns_mpls {
int ip_ttl_propagate;
int default_ttl;
size_t platform_labels;
struct mpls_route __rcu * __rcu *platform_label;

2
include/uapi/linux/mpls_iptunnel.h
View File

@ -16,11 +16,13 @@
/* MPLS tunnel attributes
* [RTA_ENCAP] = {
* [MPLS_IPTUNNEL_DST]
* [MPLS_IPTUNNEL_TTL]
* }
*/
enum {
MPLS_IPTUNNEL_UNSPEC,
MPLS_IPTUNNEL_DST,
MPLS_IPTUNNEL_TTL,
__MPLS_IPTUNNEL_MAX,
};
#define MPLS_IPTUNNEL_MAX (__MPLS_IPTUNNEL_MAX - 1)

11
net/mpls/af_mpls.c
View File

@ -34,6 +34,7 @@
static int zero = 0;
static int one = 1;
static int label_limit = (1 << 20) - 1;
static int ttl_max = 255;
static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
struct nlmsghdr *nlh, struct net *net, u32 portid,
@ -2042,6 +2043,15 @@ static const struct ctl_table mpls_table[] = {
.extra1 = &zero,
.extra2 = &one,
},
{
.procname = "default_ttl",
.data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &one,
.extra2 = &ttl_max,
},
{ }
};
@ -2053,6 +2063,7 @@ static int mpls_net_init(struct net *net)
net->mpls.platform_labels = 0;
net->mpls.platform_label = NULL;
net->mpls.ip_ttl_propagate = 1;
net->mpls.default_ttl = 255;
table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL);
if (table == NULL)

73
net/mpls/mpls_iptunnel.c
View File

@ -29,6 +29,7 @@
static const struct nla_policy mpls_iptunnel_policy[MPLS_IPTUNNEL_MAX + 1] = {
[MPLS_IPTUNNEL_DST] = { .type = NLA_U32 },
[MPLS_IPTUNNEL_TTL] = { .type = NLA_U8 },
};
static unsigned int mpls_encap_size(struct mpls_iptunnel_encap *en)
@ -49,6 +50,7 @@ static int mpls_xmit(struct sk_buff *skb)
struct rtable *rt = NULL;
struct rt6_info *rt6 = NULL;
struct mpls_dev *out_mdev;
struct net *net;
int err = 0;
bool bos;
int i;
@ -56,17 +58,7 @@ static int mpls_xmit(struct sk_buff *skb)
/* Find the output device */
out_dev = dst->dev;
/* Obtain the ttl */
if (dst->ops->family == AF_INET) {
ttl = ip_hdr(skb)->ttl;
rt = (struct rtable *)dst;
} else if (dst->ops->family == AF_INET6) {
ttl = ipv6_hdr(skb)->hop_limit;
rt6 = (struct rt6_info *)dst;
} else {
goto drop;
}
net = dev_net(out_dev);
skb_orphan(skb);
@ -78,6 +70,38 @@ static int mpls_xmit(struct sk_buff *skb)
tun_encap_info = mpls_lwtunnel_encap(dst->lwtstate);
/* Obtain the ttl using the following set of rules.
*
* LWT ttl propagation setting:
* - disabled => use default TTL value from LWT
* - enabled => use TTL value from IPv4/IPv6 header
* - default =>
* Global ttl propagation setting:
* - disabled => use default TTL value from global setting
* - enabled => use TTL value from IPv4/IPv6 header
*/
if (dst->ops->family == AF_INET) {
if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DISABLED)
ttl = tun_encap_info->default_ttl;
else if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
!net->mpls.ip_ttl_propagate)
ttl = net->mpls.default_ttl;
else
ttl = ip_hdr(skb)->ttl;
rt = (struct rtable *)dst;
} else if (dst->ops->family == AF_INET6) {
if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DISABLED)
ttl = tun_encap_info->default_ttl;
else if (tun_encap_info->ttl_propagate == MPLS_TTL_PROP_DEFAULT &&
!net->mpls.ip_ttl_propagate)
ttl = net->mpls.default_ttl;
else
ttl = ipv6_hdr(skb)->hop_limit;
rt6 = (struct rt6_info *)dst;
} else {
goto drop;
}
/* Verify the destination can hold the packet */
new_header_size = mpls_encap_size(tun_encap_info);
mtu = mpls_dev_mtu(out_dev);
@ -160,6 +184,17 @@ static int mpls_build_state(struct nlattr *nla,
&tun_encap_info->labels, tun_encap_info->label);
if (ret)
goto errout;
tun_encap_info->ttl_propagate = MPLS_TTL_PROP_DEFAULT;
if (tb[MPLS_IPTUNNEL_TTL]) {
tun_encap_info->default_ttl = nla_get_u8(tb[MPLS_IPTUNNEL_TTL]);
/* TTL 0 implies propagate from IP header */
tun_encap_info->ttl_propagate = tun_encap_info->default_ttl ?
MPLS_TTL_PROP_DISABLED :
MPLS_TTL_PROP_ENABLED;
}
newts->type = LWTUNNEL_ENCAP_MPLS;
newts->flags |= LWTUNNEL_STATE_XMIT_REDIRECT;
newts->headroom = mpls_encap_size(tun_encap_info);
@ -186,6 +221,10 @@ static int mpls_fill_encap_info(struct sk_buff *skb,
tun_encap_info->label))
goto nla_put_failure;
if (tun_encap_info->ttl_propagate != MPLS_TTL_PROP_DEFAULT &&
nla_put_u8(skb, MPLS_IPTUNNEL_TTL, tun_encap_info->default_ttl))
goto nla_put_failure;
return 0;
nla_put_failure:
@ -195,10 +234,16 @@ nla_put_failure:
static int mpls_encap_nlsize(struct lwtunnel_state *lwtstate)
{
struct mpls_iptunnel_encap *tun_encap_info;
int nlsize;
tun_encap_info = mpls_lwtunnel_encap(lwtstate);
return nla_total_size(tun_encap_info->labels * 4);
nlsize = nla_total_size(tun_encap_info->labels * 4);
if (tun_encap_info->ttl_propagate != MPLS_TTL_PROP_DEFAULT)
nlsize += nla_total_size(1);
return nlsize;
}
static int mpls_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
@ -207,7 +252,9 @@ static int mpls_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
struct mpls_iptunnel_encap *b_hdr = mpls_lwtunnel_encap(b);
int l;
if (a_hdr->labels != b_hdr->labels)
if (a_hdr->labels != b_hdr->labels ||
a_hdr->ttl_propagate != b_hdr->ttl_propagate ||
a_hdr->default_ttl != b_hdr->default_ttl)
return 1;
for (l = 0; l < MAX_NEW_LABELS; l++)