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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /net/can/gw.c
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'net/can/gw.c')
-rw-r--r--net/can/gw.c68
1 files changed, 56 insertions, 12 deletions
diff --git a/net/can/gw.c b/net/can/gw.c
index a6f448e18..455168718 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -110,6 +110,7 @@ struct cf_mod {
void (*xor)(struct can_frame *cf, struct cgw_csum_xor *xor);
void (*crc8)(struct can_frame *cf, struct cgw_csum_crc8 *crc8);
} csumfunc;
+ u32 uid;
};
@@ -548,6 +549,11 @@ static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj, int type,
goto cancel;
}
+ if (gwj->mod.uid) {
+ if (nla_put_u32(skb, CGW_MOD_UID, gwj->mod.uid) < 0)
+ goto cancel;
+ }
+
if (gwj->mod.csumfunc.crc8) {
if (nla_put(skb, CGW_CS_CRC8, CGW_CS_CRC8_LEN,
&gwj->mod.csum.crc8) < 0)
@@ -619,6 +625,7 @@ static const struct nla_policy cgw_policy[CGW_MAX+1] = {
[CGW_DST_IF] = { .type = NLA_U32 },
[CGW_FILTER] = { .len = sizeof(struct can_filter) },
[CGW_LIM_HOPS] = { .type = NLA_U8 },
+ [CGW_MOD_UID] = { .type = NLA_U32 },
};
/* check for common and gwtype specific attributes */
@@ -761,6 +768,10 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
else
mod->csumfunc.xor = cgw_csum_xor_neg;
}
+
+ if (tb[CGW_MOD_UID]) {
+ nla_memcpy(&mod->uid, tb[CGW_MOD_UID], sizeof(u32));
+ }
}
if (gwtype == CGW_TYPE_CAN_CAN) {
@@ -802,6 +813,8 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct rtcanmsg *r;
struct cgw_job *gwj;
+ struct cf_mod mod;
+ struct can_can_gw ccgw;
u8 limhops = 0;
int err = 0;
@@ -819,6 +832,36 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh)
if (r->gwtype != CGW_TYPE_CAN_CAN)
return -EINVAL;
+ err = cgw_parse_attr(nlh, &mod, CGW_TYPE_CAN_CAN, &ccgw, &limhops);
+ if (err < 0)
+ return err;
+
+ if (mod.uid) {
+
+ ASSERT_RTNL();
+
+ /* check for updating an existing job with identical uid */
+ hlist_for_each_entry(gwj, &cgw_list, list) {
+
+ if (gwj->mod.uid != mod.uid)
+ continue;
+
+ /* interfaces & filters must be identical */
+ if (memcmp(&gwj->ccgw, &ccgw, sizeof(ccgw)))
+ return -EINVAL;
+
+ /* update modifications with disabled softirq & quit */
+ local_bh_disable();
+ memcpy(&gwj->mod, &mod, sizeof(mod));
+ local_bh_enable();
+ return 0;
+ }
+ }
+
+ /* ifindex == 0 is not allowed for job creation */
+ if (!ccgw.src_idx || !ccgw.dst_idx)
+ return -ENODEV;
+
gwj = kmem_cache_alloc(cgw_cache, GFP_KERNEL);
if (!gwj)
return -ENOMEM;
@@ -828,18 +871,14 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh)
gwj->deleted_frames = 0;
gwj->flags = r->flags;
gwj->gwtype = r->gwtype;
+ gwj->limit_hops = limhops;
- err = cgw_parse_attr(nlh, &gwj->mod, CGW_TYPE_CAN_CAN, &gwj->ccgw,
- &limhops);
- if (err < 0)
- goto out;
+ /* insert already parsed information */
+ memcpy(&gwj->mod, &mod, sizeof(mod));
+ memcpy(&gwj->ccgw, &ccgw, sizeof(ccgw));
err = -ENODEV;
- /* ifindex == 0 is not allowed for job creation */
- if (!gwj->ccgw.src_idx || !gwj->ccgw.dst_idx)
- goto out;
-
gwj->src.dev = __dev_get_by_index(&init_net, gwj->ccgw.src_idx);
if (!gwj->src.dev)
@@ -856,8 +895,6 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh)
if (gwj->dst.dev->type != ARPHRD_CAN)
goto out;
- gwj->limit_hops = limhops;
-
ASSERT_RTNL();
err = cgw_register_filter(gwj);
@@ -931,8 +968,15 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh)
if (gwj->limit_hops != limhops)
continue;
- if (memcmp(&gwj->mod, &mod, sizeof(mod)))
- continue;
+ /* we have a match when uid is enabled and identical */
+ if (gwj->mod.uid || mod.uid) {
+ if (gwj->mod.uid != mod.uid)
+ continue;
+ } else {
+ /* no uid => check for identical modifications */
+ if (memcmp(&gwj->mod, &mod, sizeof(mod)))
+ continue;
+ }
/* if (r->gwtype == CGW_TYPE_CAN_CAN) - is made sure here */
if (memcmp(&gwj->ccgw, &ccgw, sizeof(ccgw)))