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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-15 14:52:16 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-15 14:52:16 -0300
commit8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be (patch)
treee9891aa6c295060d065adffd610c4f49ecf884f3 /net/sched/act_bpf.c
parenta71852147516bc1cb5b0b3cbd13639bfd4022dc8 (diff)
Linux-libre 4.3.2-gnu
Diffstat (limited to 'net/sched/act_bpf.c')
-rw-r--r--net/sched/act_bpf.c87
1 files changed, 46 insertions, 41 deletions
diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c
index d0edeb7a1..559bfa011 100644
--- a/net/sched/act_bpf.c
+++ b/net/sched/act_bpf.c
@@ -37,25 +37,24 @@ static int tcf_bpf(struct sk_buff *skb, const struct tc_action *act,
struct tcf_result *res)
{
struct tcf_bpf *prog = act->priv;
+ struct bpf_prog *filter;
int action, filter_res;
bool at_ingress = G_TC_AT(skb->tc_verd) & AT_INGRESS;
if (unlikely(!skb_mac_header_was_set(skb)))
return TC_ACT_UNSPEC;
- spin_lock(&prog->tcf_lock);
-
- prog->tcf_tm.lastuse = jiffies;
- bstats_update(&prog->tcf_bstats, skb);
+ tcf_lastuse_update(&prog->tcf_tm);
+ bstats_cpu_update(this_cpu_ptr(prog->common.cpu_bstats), skb);
- /* Needed here for accessing maps. */
rcu_read_lock();
+ filter = rcu_dereference(prog->filter);
if (at_ingress) {
__skb_push(skb, skb->mac_len);
- filter_res = BPF_PROG_RUN(prog->filter, skb);
+ filter_res = BPF_PROG_RUN(filter, skb);
__skb_pull(skb, skb->mac_len);
} else {
- filter_res = BPF_PROG_RUN(prog->filter, skb);
+ filter_res = BPF_PROG_RUN(filter, skb);
}
rcu_read_unlock();
@@ -77,7 +76,7 @@ static int tcf_bpf(struct sk_buff *skb, const struct tc_action *act,
break;
case TC_ACT_SHOT:
action = filter_res;
- prog->tcf_qstats.drops++;
+ qstats_drop_inc(this_cpu_ptr(prog->common.cpu_qstats));
break;
case TC_ACT_UNSPEC:
action = prog->tcf_action;
@@ -87,7 +86,6 @@ static int tcf_bpf(struct sk_buff *skb, const struct tc_action *act,
break;
}
- spin_unlock(&prog->tcf_lock);
return action;
}
@@ -263,7 +261,10 @@ static void tcf_bpf_prog_fill_cfg(const struct tcf_bpf *prog,
struct tcf_bpf_cfg *cfg)
{
cfg->is_ebpf = tcf_bpf_is_ebpf(prog);
- cfg->filter = prog->filter;
+ /* updates to prog->filter are prevented, since it's called either
+ * with rtnl lock or during final cleanup in rcu callback
+ */
+ cfg->filter = rcu_dereference_protected(prog->filter, 1);
cfg->bpf_ops = prog->bpf_ops;
cfg->bpf_name = prog->bpf_name;
@@ -278,7 +279,7 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
struct tc_act_bpf *parm;
struct tcf_bpf *prog;
bool is_bpf, is_ebpf;
- int ret;
+ int ret, res = 0;
if (!nla)
return -EINVAL;
@@ -287,45 +288,47 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
if (ret < 0)
return ret;
- is_bpf = tb[TCA_ACT_BPF_OPS_LEN] && tb[TCA_ACT_BPF_OPS];
- is_ebpf = tb[TCA_ACT_BPF_FD];
-
- if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf) ||
- !tb[TCA_ACT_BPF_PARMS])
+ if (!tb[TCA_ACT_BPF_PARMS])
return -EINVAL;
parm = nla_data(tb[TCA_ACT_BPF_PARMS]);
- memset(&cfg, 0, sizeof(cfg));
-
- ret = is_bpf ? tcf_bpf_init_from_ops(tb, &cfg) :
- tcf_bpf_init_from_efd(tb, &cfg);
- if (ret < 0)
- return ret;
-
if (!tcf_hash_check(parm->index, act, bind)) {
ret = tcf_hash_create(parm->index, est, act,
- sizeof(*prog), bind);
+ sizeof(*prog), bind, true);
if (ret < 0)
- goto destroy_fp;
+ return ret;
- ret = ACT_P_CREATED;
+ res = ACT_P_CREATED;
} else {
/* Don't override defaults. */
if (bind)
- goto destroy_fp;
+ return 0;
tcf_hash_release(act, bind);
- if (!replace) {
- ret = -EEXIST;
- goto destroy_fp;
- }
+ if (!replace)
+ return -EEXIST;
}
+ is_bpf = tb[TCA_ACT_BPF_OPS_LEN] && tb[TCA_ACT_BPF_OPS];
+ is_ebpf = tb[TCA_ACT_BPF_FD];
+
+ if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ memset(&cfg, 0, sizeof(cfg));
+
+ ret = is_bpf ? tcf_bpf_init_from_ops(tb, &cfg) :
+ tcf_bpf_init_from_efd(tb, &cfg);
+ if (ret < 0)
+ goto out;
+
prog = to_bpf(act);
- spin_lock_bh(&prog->tcf_lock);
+ ASSERT_RTNL();
- if (ret != ACT_P_CREATED)
+ if (res != ACT_P_CREATED)
tcf_bpf_prog_fill_cfg(prog, &old);
prog->bpf_ops = cfg.bpf_ops;
@@ -337,19 +340,21 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla,
prog->bpf_fd = cfg.bpf_fd;
prog->tcf_action = parm->action;
- prog->filter = cfg.filter;
+ rcu_assign_pointer(prog->filter, cfg.filter);
- spin_unlock_bh(&prog->tcf_lock);
-
- if (ret == ACT_P_CREATED)
+ if (res == ACT_P_CREATED) {
tcf_hash_insert(act);
- else
+ } else {
+ /* make sure the program being replaced is no longer executing */
+ synchronize_rcu();
tcf_bpf_cfg_cleanup(&old);
+ }
- return ret;
+ return res;
+out:
+ if (res == ACT_P_CREATED)
+ tcf_hash_cleanup(act, est);
-destroy_fp:
- tcf_bpf_cfg_cleanup(&cfg);
return ret;
}