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nexthop: Add support for IPv6 gateways 

Handle IPv6 gateway in a nexthop spec. If nh_family is set to AF_INET6,
NHA_GATEWAY is expected to be an IPv6 address. Add ipv6 option to gw in
nh_config to hold the address, add fib6_nh to nh_info to leverage the
ipv6 initialization and cleanup code. Update nh_fill_node to dump the v6
address.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-05-24 14:43:06 -07:00 committed by David S. Miller
parent 597cfe4fc3
commit 53010f991a
2 changed files with 59 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/nexthop.h
View File

@ -12,6 +12,7 @@
#include <linux/netdevice.h>
#include <linux/types.h>
#include <net/ip_fib.h>
#include <net/ip6_fib.h>
#include <net/netlink.h>
#define NEXTHOP_VALID_USER_FLAGS RTNH_F_ONLINK
@ -31,6 +32,7 @@ struct nh_config {
union {
__be32 ipv4;
struct in6_addr ipv6;
} gw;
u32 nlflags;
@ -47,6 +49,7 @@ struct nh_info {
union {
struct fib_nh_common fib_nhc;
struct fib_nh fib_nh;
struct fib6_nh fib6_nh;
};
};

56
net/ipv4/nexthop.c
View File

@ -8,6 +8,7 @@
#include <linux/nexthop.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <net/ipv6_stubs.h>
#include <net/nexthop.h>
#include <net/route.h>
#include <net/sock.h>
@ -61,6 +62,9 @@ void nexthop_free_rcu(struct rcu_head *head)
case AF_INET:
fib_nh_release(nh->net, &nhi->fib_nh);
break;
case AF_INET6:
ipv6_stub->fib6_nh_release(&nhi->fib6_nh);
break;
}
kfree(nhi);
@ -127,6 +131,7 @@ static u32 nh_find_unused_id(struct net *net)
static int nh_fill_node(struct sk_buff *skb, struct nexthop *nh,
int event, u32 portid, u32 seq, unsigned int nlflags)
{
struct fib6_nh *fib6_nh;
struct fib_nh *fib_nh;
struct nlmsghdr *nlh;
struct nh_info *nhi;
@ -168,6 +173,13 @@ static int nh_fill_node(struct sk_buff *skb, struct nexthop *nh,
nla_put_u32(skb, NHA_GATEWAY, fib_nh->fib_nh_gw4))
goto nla_put_failure;
break;
case AF_INET6:
fib6_nh = &nhi->fib6_nh;
if (fib6_nh->fib_nh_gw_family &&
nla_put_in6_addr(skb, NHA_GATEWAY, &fib6_nh->fib_nh_gw6))
goto nla_put_failure;
break;
}
out:
@ -193,6 +205,12 @@ static size_t nh_nlmsg_size(struct nexthop *nh)
if (nhi->fib_nh.fib_nh_gw_family)
sz += nla_total_size(4); /* NHA_GATEWAY */
break;
case AF_INET6:
/* NHA_GATEWAY */
if (nhi->fib6_nh.fib_nh_gw_family)
sz += nla_total_size(sizeof(const struct in6_addr));
break;
}
return sz;
@ -374,6 +392,33 @@ out:
return err;
}
static int nh_create_ipv6(struct net *net, struct nexthop *nh,
struct nh_info *nhi, struct nh_config *cfg,
struct netlink_ext_ack *extack)
{
struct fib6_nh *fib6_nh = &nhi->fib6_nh;
struct fib6_config fib6_cfg = {
.fc_table = l3mdev_fib_table(cfg->dev),
.fc_ifindex = cfg->nh_ifindex,
.fc_gateway = cfg->gw.ipv6,
.fc_flags = cfg->nh_flags,
};
int err = -EINVAL;
if (!ipv6_addr_any(&cfg->gw.ipv6))
fib6_cfg.fc_flags |= RTF_GATEWAY;
/* sets nh_dev if successful */
err = ipv6_stub->fib6_nh_init(net, fib6_nh, &fib6_cfg, GFP_KERNEL,
extack);
if (err)
ipv6_stub->fib6_nh_release(fib6_nh);
else
nh->nh_flags = fib6_nh->fib_nh_flags;
return err;
}
static struct nexthop *nexthop_create(struct net *net, struct nh_config *cfg,
struct netlink_ext_ack *extack)
{
@ -407,6 +452,9 @@ static struct nexthop *nexthop_create(struct net *net, struct nh_config *cfg,
case AF_INET:
err = nh_create_ipv4(net, nh, nhi, cfg, extack);
break;
case AF_INET6:
err = nh_create_ipv6(net, nh, nhi, cfg, extack);
break;
}
if (err) {
@ -487,6 +535,7 @@ static int rtm_to_nh_config(struct net *net, struct sk_buff *skb,
switch (nhm->nh_family) {
case AF_INET:
case AF_INET6:
break;
default:
NL_SET_ERR_MSG(extack, "Invalid address family");
@ -556,6 +605,13 @@ static int rtm_to_nh_config(struct net *net, struct sk_buff *skb,
}
cfg->gw.ipv4 = nla_get_be32(gwa);
break;
case AF_INET6:
if (nla_len(gwa) != sizeof(struct in6_addr)) {
NL_SET_ERR_MSG(extack, "Invalid gateway");
goto out;
}
cfg->gw.ipv6 = nla_get_in6_addr(gwa);
break;
default:
NL_SET_ERR_MSG(extack,
"Unknown address family for gateway");