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net: isdn: use sk_unattached_filter api

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Similarly as in ppp, we need to migrate the ISDN/PPP code to make use
of the sk_unattached_filter api in order to decouple having direct
filter structure access. By using sk_unattached_filter_{create,destroy},
we can allow for the possibility to jit compile filters for faster
filter verdicts as well.

Joint work with Alexei Starovoitov.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: isdn4linux@listserv.isdn4linux.de
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2014-03-28 18:58:24 +01:00 committed by David S. Miller
parent 568f194e8b
commit 77e0114ae9
2 changed files with 43 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
drivers/isdn/i4l/isdn_ppp.c
View File

@ -378,10 +378,15 @@ isdn_ppp_release(int min, struct file *file)
is->slcomp = NULL;
#endif
#ifdef CONFIG_IPPP_FILTER
kfree(is->pass_filter);
is->pass_filter = NULL;
kfree(is->active_filter);
is->active_filter = NULL;
if (is->pass_filter) {
sk_unattached_filter_destroy(is->pass_filter);
is->pass_filter = NULL;
}
if (is->active_filter) {
sk_unattached_filter_destroy(is->active_filter);
is->active_filter = NULL;
}
#endif
/* TODO: if this was the previous master: link the stuff to the new master */
@ -629,25 +634,41 @@ isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg)
#ifdef CONFIG_IPPP_FILTER
case PPPIOCSPASS:
{
struct sock_fprog fprog;
struct sock_filter *code;
int len = get_filter(argp, &code);
int err, len = get_filter(argp, &code);
if (len < 0)
return len;
kfree(is->pass_filter);
is->pass_filter = code;
is->pass_len = len;
break;
fprog.len = len;
fprog.filter = code;
if (is->pass_filter)
sk_unattached_filter_destroy(is->pass_filter);
err = sk_unattached_filter_create(&is->pass_filter, &fprog);
kfree(code);
return err;
}
case PPPIOCSACTIVE:
{
struct sock_fprog fprog;
struct sock_filter *code;
int len = get_filter(argp, &code);
int err, len = get_filter(argp, &code);
if (len < 0)
return len;
kfree(is->active_filter);
is->active_filter = code;
is->active_len = len;
break;
fprog.len = len;
fprog.filter = code;
if (is->active_filter)
sk_unattached_filter_destroy(is->active_filter);
err = sk_unattached_filter_create(&is->active_filter, &fprog);
kfree(code);
return err;
}
#endif /* CONFIG_IPPP_FILTER */
default:
@ -1147,14 +1168,14 @@ isdn_ppp_push_higher(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *
}
if (is->pass_filter
&& sk_run_filter(skb, is->pass_filter) == 0) {
&& SK_RUN_FILTER(is->pass_filter, skb) == 0) {
if (is->debug & 0x2)
printk(KERN_DEBUG "IPPP: inbound frame filtered.\n");
kfree_skb(skb);
return;
}
if (!(is->active_filter
&& sk_run_filter(skb, is->active_filter) == 0)) {
&& SK_RUN_FILTER(is->active_filter, skb) == 0)) {
if (is->debug & 0x2)
printk(KERN_DEBUG "IPPP: link-active filter: resetting huptimer.\n");
lp->huptimer = 0;
@ -1293,14 +1314,14 @@ isdn_ppp_xmit(struct sk_buff *skb, struct net_device *netdev)
}
if (ipt->pass_filter
&& sk_run_filter(skb, ipt->pass_filter) == 0) {
&& SK_RUN_FILTER(ipt->pass_filter, skb) == 0) {
if (ipt->debug & 0x4)
printk(KERN_DEBUG "IPPP: outbound frame filtered.\n");
kfree_skb(skb);
goto unlock;
}
if (!(ipt->active_filter
&& sk_run_filter(skb, ipt->active_filter) == 0)) {
&& SK_RUN_FILTER(ipt->active_filter, skb) == 0)) {
if (ipt->debug & 0x4)
printk(KERN_DEBUG "IPPP: link-active filter: resetting huptimer.\n");
lp->huptimer = 0;
@ -1490,9 +1511,9 @@ int isdn_ppp_autodial_filter(struct sk_buff *skb, isdn_net_local *lp)
}
drop |= is->pass_filter
&& sk_run_filter(skb, is->pass_filter) == 0;
&& SK_RUN_FILTER(is->pass_filter, skb) == 0;
drop |= is->active_filter
&& sk_run_filter(skb, is->active_filter) == 0;
&& SK_RUN_FILTER(is->active_filter, skb) == 0;
skb_push(skb, IPPP_MAX_HEADER - 4);
return drop;

5
include/linux/isdn_ppp.h
View File

@ -180,9 +180,8 @@ struct ippp_struct {
struct slcompress *slcomp;
#endif
#ifdef CONFIG_IPPP_FILTER
struct sock_filter *pass_filter; /* filter for packets to pass */
struct sock_filter *active_filter; /* filter for pkts to reset idle */
unsigned pass_len, active_len;
struct sk_filter *pass_filter; /* filter for packets to pass */
struct sk_filter *active_filter; /* filter for pkts to reset idle */
#endif
unsigned long debug;
struct isdn_ppp_compressor *compressor,*decompressor;