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ipv4: Prepare fib_config for IPv6 gateway 

Similar to rtable, fib_config needs to allow the gateway to be either an
IPv4 or an IPv6 address. To that end, rename fc_gw to fc_gw4 to mean an
IPv4 address and add fc_gw_family. Checks on 'is a gateway set' are changed
to see if fc_gw_family is set. In the process prepare the code for a
fc_gw_family == AF_INET6.

Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-05 16:30:28 -07:00 committed by David S. Miller
parent 1550c17193
commit f35b794b3b
3 changed files with 34 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/ip_fib.h
View File

@ -32,10 +32,11 @@ struct fib_config {
u8 fc_protocol;
u8 fc_scope;
u8 fc_type;
/* 3 bytes unused */
u8 fc_gw_family;
/* 2 bytes unused */
u32 fc_table;
__be32 fc_dst;
__be32 fc_gw;
__be32 fc_gw4;
int fc_oif;
u32 fc_flags;
u32 fc_priority;

8
net/ipv4/fib_frontend.c
View File

@ -558,7 +558,8 @@ static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
if (rt->rt_gateway.sa_family == AF_INET && addr) {
unsigned int addr_type;
cfg->fc_gw = addr;
cfg->fc_gw4 = addr;
cfg->fc_gw_family = AF_INET;
addr_type = inet_addr_type_table(net, addr, cfg->fc_table);
if (rt->rt_flags & RTF_GATEWAY &&
addr_type == RTN_UNICAST)
@ -568,7 +569,7 @@ static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
if (cmd == SIOCDELRT)
return 0;
if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw_family)
return -EINVAL;
if (cfg->fc_scope == RT_SCOPE_NOWHERE)
@ -708,7 +709,8 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
cfg->fc_oif = nla_get_u32(attr);
break;
case RTA_GATEWAY:
cfg->fc_gw = nla_get_be32(attr);
cfg->fc_gw_family = AF_INET;
cfg->fc_gw4 = nla_get_be32(attr);
break;
case RTA_VIA:
NL_SET_ERR_MSG(extack, "IPv4 does not support RTA_VIA attribute");

40
net/ipv4/fib_semantics.c
View File

@ -511,8 +511,8 @@ int fib_nh_init(struct net *net, struct fib_nh *nh,
goto init_failure;
nh->fib_nh_oif = cfg->fc_oif;
if (cfg->fc_gw) {
nh->fib_nh_gw4 = cfg->fc_gw;
if (cfg->fc_gw_family == AF_INET) {
nh->fib_nh_gw4 = cfg->fc_gw4;
nh->fib_nh_gw_family = AF_INET;
}
nh->fib_nh_flags = cfg->fc_flags;
@ -589,8 +589,10 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
nla = nla_find(attrs, attrlen, RTA_GATEWAY);
if (nla)
fib_cfg.fc_gw = nla_get_in_addr(nla);
if (nla) {
fib_cfg.fc_gw_family = AF_INET;
fib_cfg.fc_gw4 = nla_get_in_addr(nla);
}
nla = nla_find(attrs, attrlen, RTA_FLOW);
if (nla)
@ -616,10 +618,14 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
"Nexthop device index does not match RTA_OIF");
goto errout;
}
if (cfg->fc_gw && fi->fib_nh->fib_nh_gw4 != cfg->fc_gw) {
NL_SET_ERR_MSG(extack,
"Nexthop gateway does not match RTA_GATEWAY");
goto errout;
if (cfg->fc_gw_family) {
if (cfg->fc_gw_family != fi->fib_nh->fib_nh_gw_family ||
(cfg->fc_gw_family == AF_INET &&
fi->fib_nh->fib_nh_gw4 != cfg->fc_gw4)) {
NL_SET_ERR_MSG(extack,
"Nexthop gateway does not match RTA_GATEWAY");
goto errout;
}
}
#ifdef CONFIG_IP_ROUTE_CLASSID
if (cfg->fc_flow && fi->fib_nh->nh_tclassid != cfg->fc_flow) {
@ -719,7 +725,7 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi,
if (cfg->fc_priority && cfg->fc_priority != fi->fib_priority)
return 1;
if (cfg->fc_oif || cfg->fc_gw) {
if (cfg->fc_oif || cfg->fc_gw_family) {
if (cfg->fc_encap) {
if (fib_encap_match(cfg->fc_encap_type, cfg->fc_encap,
fi->fib_nh, cfg, extack))
@ -730,10 +736,16 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi,
cfg->fc_flow != fi->fib_nh->nh_tclassid)
return 1;
#endif
if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->fib_nh_oif) &&
(!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->fib_nh_gw4))
return 0;
return 1;
if ((cfg->fc_oif && cfg->fc_oif != fi->fib_nh->fib_nh_oif) ||
(cfg->fc_gw_family &&
cfg->fc_gw_family != fi->fib_nh->fib_nh_gw_family))
return 1;
if (cfg->fc_gw_family == AF_INET &&
cfg->fc_gw4 != fi->fib_nh->fib_nh_gw4)
return 1;
return 0;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
@ -1204,7 +1216,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
goto failure;
if (fib_props[cfg->fc_type].error) {
if (cfg->fc_gw || cfg->fc_oif || cfg->fc_mp) {
if (cfg->fc_gw_family || cfg->fc_oif || cfg->fc_mp) {
NL_SET_ERR_MSG(extack,
"Gateway, device and multipath can not be specified for this route type");
goto err_inval;