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author | 2015-09-15 23:05:42 -0700 | |
---|---|---|
committer | 2015-09-17 21:09:06 -0700 | |
commit | 045efa82ff563cd4e656ca1c2e354fa5bf6bbda4 (patch) | |
tree | 8a2604aef00d9d40a6eaa877431171c3a38c3663 /net/sched | |
parent | net: only check perm protocol when register proto (diff) | |
download | linux-045efa82ff563cd4e656ca1c2e354fa5bf6bbda4.tar.gz linux-045efa82ff563cd4e656ca1c2e354fa5bf6bbda4.tar.bz2 linux-045efa82ff563cd4e656ca1c2e354fa5bf6bbda4.zip |
cls_bpf: introduce integrated actions
Often cls_bpf classifier is used with single action drop attached.
Optimize this use case and let cls_bpf return both classid and action.
For backwards compatibility reasons enable this feature under
TCA_BPF_FLAG_ACT_DIRECT flag.
Then more interesting programs like the following are easier to write:
int cls_bpf_prog(struct __sk_buff *skb)
{
/* classify arp, ip, ipv6 into different traffic classes
* and drop all other packets
*/
switch (skb->protocol) {
case htons(ETH_P_ARP):
skb->tc_classid = 1;
break;
case htons(ETH_P_IP):
skb->tc_classid = 2;
break;
case htons(ETH_P_IPV6):
skb->tc_classid = 3;
break;
default:
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
Joint work with Daniel Borkmann.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r-- | net/sched/cls_bpf.c | 60 |
1 files changed, 49 insertions, 11 deletions
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c index e5168f8b9640..77b0ef148256 100644 --- a/net/sched/cls_bpf.c +++ b/net/sched/cls_bpf.c @@ -38,6 +38,7 @@ struct cls_bpf_prog { struct bpf_prog *filter; struct list_head link; struct tcf_result res; + bool exts_integrated; struct tcf_exts exts; u32 handle; union { @@ -52,6 +53,7 @@ struct cls_bpf_prog { static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { [TCA_BPF_CLASSID] = { .type = NLA_U32 }, + [TCA_BPF_FLAGS] = { .type = NLA_U32 }, [TCA_BPF_FD] = { .type = NLA_U32 }, [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, .len = CLS_BPF_NAME_LEN }, [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, @@ -59,6 +61,22 @@ static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, }; +static int cls_bpf_exec_opcode(int code) +{ + switch (code) { + case TC_ACT_OK: + case TC_ACT_RECLASSIFY: + case TC_ACT_SHOT: + case TC_ACT_PIPE: + case TC_ACT_STOLEN: + case TC_ACT_QUEUED: + case TC_ACT_UNSPEC: + return code; + default: + return TC_ACT_UNSPEC; + } +} + static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res) { @@ -79,6 +97,8 @@ static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, list_for_each_entry_rcu(prog, &head->plist, link) { int filter_res; + qdisc_skb_cb(skb)->tc_classid = prog->res.classid; + if (at_ingress) { /* It is safe to push/pull even if skb_shared() */ __skb_push(skb, skb->mac_len); @@ -88,6 +108,16 @@ static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, filter_res = BPF_PROG_RUN(prog->filter, skb); } + if (prog->exts_integrated) { + res->class = prog->res.class; + res->classid = qdisc_skb_cb(skb)->tc_classid; + + ret = cls_bpf_exec_opcode(filter_res); + if (ret == TC_ACT_UNSPEC) + continue; + break; + } + if (filter_res == 0) continue; @@ -195,8 +225,7 @@ static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle) return ret; } -static int cls_bpf_prog_from_ops(struct nlattr **tb, - struct cls_bpf_prog *prog, u32 classid) +static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) { struct sock_filter *bpf_ops; struct sock_fprog_kern fprog_tmp; @@ -230,15 +259,13 @@ static int cls_bpf_prog_from_ops(struct nlattr **tb, prog->bpf_ops = bpf_ops; prog->bpf_num_ops = bpf_num_ops; prog->bpf_name = NULL; - prog->filter = fp; - prog->res.classid = classid; return 0; } -static int cls_bpf_prog_from_efd(struct nlattr **tb, - struct cls_bpf_prog *prog, u32 classid) +static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, + const struct tcf_proto *tp) { struct bpf_prog *fp; char *name = NULL; @@ -268,9 +295,7 @@ static int cls_bpf_prog_from_efd(struct nlattr **tb, prog->bpf_ops = NULL; prog->bpf_fd = bpf_fd; prog->bpf_name = name; - prog->filter = fp; - prog->res.classid = classid; return 0; } @@ -280,8 +305,8 @@ static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, unsigned long base, struct nlattr **tb, struct nlattr *est, bool ovr) { + bool is_bpf, is_ebpf, have_exts = false; struct tcf_exts exts; - bool is_bpf, is_ebpf; u32 classid; int ret; @@ -298,9 +323,22 @@ static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, return ret; classid = nla_get_u32(tb[TCA_BPF_CLASSID]); + if (tb[TCA_BPF_FLAGS]) { + u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); + + if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) { + tcf_exts_destroy(&exts); + return -EINVAL; + } + + have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; + } + + prog->res.classid = classid; + prog->exts_integrated = have_exts; - ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog, classid) : - cls_bpf_prog_from_efd(tb, prog, classid); + ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : + cls_bpf_prog_from_efd(tb, prog, tp); if (ret < 0) { tcf_exts_destroy(&exts); return ret; |