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[NET_SCHED]: Add mask support to fwmark classifier

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Support masking the nfmark value before the search. The mask value is
global for all filters contained in one instance. It can only be set
when a new instance is created, all filters must specify the same mask.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-08-25 16:11:42 -07:00 committed by David S. Miller
parent 88e91f2903
commit b4e9b520ca
2 changed files with 25 additions and 1 deletions
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1
include/linux/pkt_cls.h
View file

@ -305,6 +305,7 @@ enum
TCA_FW_POLICE,
TCA_FW_INDEV, /* used by CONFIG_NET_CLS_IND */
TCA_FW_ACT, /* used by CONFIG_NET_CLS_ACT */
TCA_FW_MASK,
__TCA_FW_MAX
};

25
net/sched/cls_fw.c
View file

@ -50,6 +50,7 @@
struct fw_head
{
struct fw_filter *ht[HTSIZE];
u32 mask;
};
struct fw_filter
@ -101,7 +102,7 @@ static int fw_classify(struct sk_buff *skb, struct tcf_proto *tp,
struct fw_filter *f;
int r;
#ifdef CONFIG_NETFILTER
u32 id = skb->nfmark;
u32 id = skb->nfmark & head->mask;
#else
u32 id = 0;
#endif
@ -209,7 +210,9 @@ static int
fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
struct rtattr **tb, struct rtattr **tca, unsigned long base)
{
struct fw_head *head = (struct fw_head *)tp->root;
struct tcf_exts e;
u32 mask;
int err;
err = tcf_exts_validate(tp, tb, tca[TCA_RATE-1], &e, &fw_ext_map);
@ -232,6 +235,15 @@ fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
}
#endif /* CONFIG_NET_CLS_IND */
if (tb[TCA_FW_MASK-1]) {
if (RTA_PAYLOAD(tb[TCA_FW_MASK-1]) != sizeof(u32))
goto errout;
mask = *(u32*)RTA_DATA(tb[TCA_FW_MASK-1]);
if (mask != head->mask)
goto errout;
} else if (head->mask != 0xFFFFFFFF)
goto errout;
tcf_exts_change(tp, &f->exts, &e);
return 0;
@ -267,9 +279,17 @@ static int fw_change(struct tcf_proto *tp, unsigned long base,
return -EINVAL;
if (head == NULL) {
u32 mask = 0xFFFFFFFF;
if (tb[TCA_FW_MASK-1]) {
if (RTA_PAYLOAD(tb[TCA_FW_MASK-1]) != sizeof(u32))
return -EINVAL;
mask = *(u32*)RTA_DATA(tb[TCA_FW_MASK-1]);
}
head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
if (head == NULL)
return -ENOBUFS;
head->mask = mask;
tcf_tree_lock(tp);
tp->root = head;
@ -330,6 +350,7 @@ static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
static int fw_dump(struct tcf_proto *tp, unsigned long fh,
struct sk_buff *skb, struct tcmsg *t)
{
struct fw_head *head = (struct fw_head *)tp->root;
struct fw_filter *f = (struct fw_filter*)fh;
unsigned char *b = skb->tail;
struct rtattr *rta;
@ -351,6 +372,8 @@ static int fw_dump(struct tcf_proto *tp, unsigned long fh,
if (strlen(f->indev))
RTA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev);
#endif /* CONFIG_NET_CLS_IND */
if (head->mask != 0xFFFFFFFF)
RTA_PUT(skb, TCA_FW_MASK, 4, &head->mask);
if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
goto rtattr_failure;