net: isdn: use sk_unattached_filter api

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>

diff --git a/drivers/isdn/i4l/isdn_ppp.c b/drivers/isdn/i4l/isdn_ppp.c
index 38ceac5..a5da511 100644 (file)
--- a/drivers/isdn/i4l/isdn_ppp.c
+++ b/drivers/isdn/i4l/isdn_ppp.c
@@ -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;

diff --git a/include/linux/isdn_ppp.h b/include/linux/isdn_ppp.h
index d5f62bc..8e10f57 100644 (file)
--- a/include/linux/isdn_ppp.h
+++ b/include/linux/isdn_ppp.h
@@ -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;