Commit 1b038a5e authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller

net 03/05: fib_rules: add oif classification

commit 68144d350f4f6c348659c825cde6a82b34c27a91
Author: Patrick McHardy <kaber@trash.net>
Date:   Thu Dec 3 12:05:25 2009 +0100

    net: fib_rules: add oif classification

    Support routing table lookup based on the flow's oif. This is useful to
    classify packets originating from sockets bound to interfaces differently.

    The route cache already includes the oif and needs no changes.
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 491deb24
......@@ -10,6 +10,7 @@
#define FIB_RULE_UNRESOLVED 0x00000004
#define FIB_RULE_IIF_DETACHED 0x00000008
#define FIB_RULE_DEV_DETACHED FIB_RULE_IIF_DETACHED
#define FIB_RULE_OIF_DETACHED 0x00000010
/* try to find source address in routing lookups */
#define FIB_RULE_FIND_SADDR 0x00010000
......@@ -47,6 +48,7 @@ enum {
FRA_UNUSED8,
FRA_TABLE, /* Extended table id */
FRA_FWMASK, /* mask for netfilter mark */
FRA_OIFNAME,
__FRA_MAX
};
......
......@@ -11,6 +11,7 @@ struct fib_rule {
struct list_head list;
atomic_t refcnt;
int iifindex;
int oifindex;
u32 mark;
u32 mark_mask;
u32 pref;
......@@ -20,6 +21,7 @@ struct fib_rule {
u32 target;
struct fib_rule * ctarget;
char iifname[IFNAMSIZ];
char oifname[IFNAMSIZ];
struct rcu_head rcu;
struct net * fr_net;
};
......@@ -68,6 +70,7 @@ struct fib_rules_ops {
#define FRA_GENERIC_POLICY \
[FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
[FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
[FRA_PRIORITY] = { .type = NLA_U32 }, \
[FRA_FWMARK] = { .type = NLA_U32 }, \
[FRA_FWMASK] = { .type = NLA_U32 }, \
......
......@@ -138,6 +138,9 @@ static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
if (rule->iifindex && (rule->iifindex != fl->iif))
goto out;
if (rule->oifindex && (rule->oifindex != fl->oif))
goto out;
if ((rule->mark ^ fl->mark) & rule->mark_mask)
goto out;
......@@ -258,6 +261,16 @@ static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
rule->iifindex = dev->ifindex;
}
if (tb[FRA_OIFNAME]) {
struct net_device *dev;
rule->oifindex = -1;
nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
dev = __dev_get_by_name(net, rule->oifname);
if (dev)
rule->oifindex = dev->ifindex;
}
if (tb[FRA_FWMARK]) {
rule->mark = nla_get_u32(tb[FRA_FWMARK]);
if (rule->mark)
......@@ -392,6 +405,10 @@ static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
continue;
if (tb[FRA_OIFNAME] &&
nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
continue;
if (tb[FRA_FWMARK] &&
(rule->mark != nla_get_u32(tb[FRA_FWMARK])))
continue;
......@@ -448,6 +465,7 @@ static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
{
size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
+ nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
+ nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
+ nla_total_size(4) /* FRA_PRIORITY */
+ nla_total_size(4) /* FRA_TABLE */
+ nla_total_size(4) /* FRA_FWMARK */
......@@ -488,6 +506,13 @@ static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
frh->flags |= FIB_RULE_IIF_DETACHED;
}
if (rule->oifname[0]) {
NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
if (rule->oifindex == -1)
frh->flags |= FIB_RULE_OIF_DETACHED;
}
if (rule->pref)
NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
......@@ -603,6 +628,9 @@ static void attach_rules(struct list_head *rules, struct net_device *dev)
if (rule->iifindex == -1 &&
strcmp(dev->name, rule->iifname) == 0)
rule->iifindex = dev->ifindex;
if (rule->oifindex == -1 &&
strcmp(dev->name, rule->oifname) == 0)
rule->oifindex = dev->ifindex;
}
}
......@@ -610,9 +638,12 @@ static void detach_rules(struct list_head *rules, struct net_device *dev)
{
struct fib_rule *rule;
list_for_each_entry(rule, rules, list)
list_for_each_entry(rule, rules, list) {
if (rule->iifindex == dev->ifindex)
rule->iifindex = -1;
if (rule->oifindex == dev->ifindex)
rule->oifindex = -1;
}
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment