From: Tony Nguyen <anthony.l.nguyen@intel.com>
To: davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com,
edumazet@google.com
Cc: Wojciech Drewek <wojciech.drewek@intel.com>,
netdev@vger.kernel.org, anthony.l.nguyen@intel.com,
xiyou.wangcong@gmail.com, jesse.brandeburg@intel.com,
gustavoars@kernel.org, baowen.zheng@corigine.com,
boris.sukholitko@broadcom.com, kurt@linutronix.de,
pablo@netfilter.org, paulb@nvidia.com, simon.horman@corigine.com,
komachi.yoshiki@gmail.com, zhangkaiheb@126.com,
michal.swiatkowski@linux.intel.com, alexandr.lobakin@intel.com,
gnault@redhat.com, mostrows@speakeasy.net, paulus@samba.org,
marcin.szycik@linux.intel.com
Subject: [PATCH net-next 1/4] flow_dissector: Add PPPoE dissectors
Date: Tue, 26 Jul 2022 13:31:30 -0700 [thread overview]
Message-ID: <20220726203133.2171332-2-anthony.l.nguyen@intel.com> (raw)
In-Reply-To: <20220726203133.2171332-1-anthony.l.nguyen@intel.com>
From: Wojciech Drewek <wojciech.drewek@intel.com>
Allow to dissect PPPoE specific fields which are:
- session ID (16 bits)
- ppp protocol (16 bits)
- type (16 bits) - this is PPPoE ethertype, for now only
ETH_P_PPP_SES is supported, possible ETH_P_PPP_DISC
in the future
The goal is to make the following TC command possible:
# tc filter add dev ens6f0 ingress prio 1 protocol ppp_ses \
flower \
pppoe_sid 12 \
ppp_proto ip \
action drop
Note that only PPPoE Session is supported.
Signed-off-by: Wojciech Drewek <wojciech.drewek@intel.com>
Acked-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
include/linux/ppp_defs.h | 14 ++++++++++
include/net/flow_dissector.h | 13 +++++++++
net/core/flow_dissector.c | 53 +++++++++++++++++++++++++++++++-----
3 files changed, 73 insertions(+), 7 deletions(-)
diff --git a/include/linux/ppp_defs.h b/include/linux/ppp_defs.h
index 9d2b388fae1a..b7e57fdbd413 100644
--- a/include/linux/ppp_defs.h
+++ b/include/linux/ppp_defs.h
@@ -11,4 +11,18 @@
#include <uapi/linux/ppp_defs.h>
#define PPP_FCS(fcs, c) crc_ccitt_byte(fcs, c)
+
+/**
+ * ppp_proto_is_valid - checks if PPP protocol is valid
+ * @proto: PPP protocol
+ *
+ * Assumes proto is not compressed.
+ * Protocol is valid if the value is odd and the least significant bit of the
+ * most significant octet is 0 (see RFC 1661, section 2).
+ */
+static inline bool ppp_proto_is_valid(u16 proto)
+{
+ return !!((proto & 0x0101) == 0x0001);
+}
+
#endif /* _PPP_DEFS_H_ */
diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 0f9544a9bb9e..6c74812d64b2 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -277,6 +277,18 @@ struct flow_dissector_key_num_of_vlans {
u8 num_of_vlans;
};
+/**
+ * struct flow_dissector_key_pppoe:
+ * @session_id: pppoe session id
+ * @ppp_proto: ppp protocol
+ * @type: pppoe eth type
+ */
+struct flow_dissector_key_pppoe {
+ __be16 session_id;
+ __be16 ppp_proto;
+ __be16 type;
+};
+
enum flow_dissector_key_id {
FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
@@ -307,6 +319,7 @@ enum flow_dissector_key_id {
FLOW_DISSECTOR_KEY_CT, /* struct flow_dissector_key_ct */
FLOW_DISSECTOR_KEY_HASH, /* struct flow_dissector_key_hash */
FLOW_DISSECTOR_KEY_NUM_OF_VLANS, /* struct flow_dissector_key_num_of_vlans */
+ FLOW_DISSECTOR_KEY_PPPOE, /* struct flow_dissector_key_pppoe */
FLOW_DISSECTOR_KEY_MAX,
};
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 6aee04f75e3e..237d396b6e41 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -895,6 +895,11 @@ bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
return result == BPF_OK;
}
+static bool is_pppoe_ses_hdr_valid(struct pppoe_hdr hdr)
+{
+ return hdr.ver == 1 && hdr.type == 1 && hdr.code == 0;
+}
+
/**
* __skb_flow_dissect - extract the flow_keys struct and return it
* @net: associated network namespace, derived from @skb if NULL
@@ -1214,26 +1219,60 @@ bool __skb_flow_dissect(const struct net *net,
struct pppoe_hdr hdr;
__be16 proto;
} *hdr, _hdr;
+ u16 ppp_proto;
+
hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
if (!hdr) {
fdret = FLOW_DISSECT_RET_OUT_BAD;
break;
}
- nhoff += PPPOE_SES_HLEN;
- switch (hdr->proto) {
- case htons(PPP_IP):
+ if (!is_pppoe_ses_hdr_valid(hdr->hdr)) {
+ fdret = FLOW_DISSECT_RET_OUT_BAD;
+ break;
+ }
+
+ /* least significant bit of the most significant octet
+ * indicates if protocol field was compressed
+ */
+ ppp_proto = ntohs(hdr->proto);
+ if (ppp_proto & 0x0100) {
+ ppp_proto = ppp_proto >> 8;
+ nhoff += PPPOE_SES_HLEN - 1;
+ } else {
+ nhoff += PPPOE_SES_HLEN;
+ }
+
+ if (ppp_proto == PPP_IP) {
proto = htons(ETH_P_IP);
fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
- break;
- case htons(PPP_IPV6):
+ } else if (ppp_proto == PPP_IPV6) {
proto = htons(ETH_P_IPV6);
fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
- break;
- default:
+ } else if (ppp_proto == PPP_MPLS_UC) {
+ proto = htons(ETH_P_MPLS_UC);
+ fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
+ } else if (ppp_proto == PPP_MPLS_MC) {
+ proto = htons(ETH_P_MPLS_MC);
+ fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
+ } else if (ppp_proto_is_valid(ppp_proto)) {
+ fdret = FLOW_DISSECT_RET_OUT_GOOD;
+ } else {
fdret = FLOW_DISSECT_RET_OUT_BAD;
break;
}
+
+ if (dissector_uses_key(flow_dissector,
+ FLOW_DISSECTOR_KEY_PPPOE)) {
+ struct flow_dissector_key_pppoe *key_pppoe;
+
+ key_pppoe = skb_flow_dissector_target(flow_dissector,
+ FLOW_DISSECTOR_KEY_PPPOE,
+ target_container);
+ key_pppoe->session_id = hdr->hdr.sid;
+ key_pppoe->ppp_proto = htons(ppp_proto);
+ key_pppoe->type = htons(ETH_P_PPP_SES);
+ }
break;
}
case htons(ETH_P_TIPC): {
--
2.35.1
next prev parent reply other threads:[~2022-07-26 20:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-26 20:31 [PATCH net-next 0/4][pull request] ice: PPPoE offload support Tony Nguyen
2022-07-26 20:31 ` Tony Nguyen [this message]
2022-07-26 20:31 ` [PATCH net-next 2/4] net/sched: flower: Add PPPoE filter Tony Nguyen
2022-07-26 20:31 ` [PATCH net-next 3/4] flow_offload: Introduce flow_match_pppoe Tony Nguyen
2022-07-26 20:31 ` [PATCH net-next 4/4] ice: Add support for PPPoE hardware offload Tony Nguyen
2022-07-28 10:40 ` [PATCH net-next 0/4][pull request] ice: PPPoE offload support patchwork-bot+netdevbpf
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220726203133.2171332-2-anthony.l.nguyen@intel.com \
--to=anthony.l.nguyen@intel.com \
--cc=alexandr.lobakin@intel.com \
--cc=baowen.zheng@corigine.com \
--cc=boris.sukholitko@broadcom.com \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=gnault@redhat.com \
--cc=gustavoars@kernel.org \
--cc=jesse.brandeburg@intel.com \
--cc=komachi.yoshiki@gmail.com \
--cc=kuba@kernel.org \
--cc=kurt@linutronix.de \
--cc=marcin.szycik@linux.intel.com \
--cc=michal.swiatkowski@linux.intel.com \
--cc=mostrows@speakeasy.net \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=pablo@netfilter.org \
--cc=paulb@nvidia.com \
--cc=paulus@samba.org \
--cc=simon.horman@corigine.com \
--cc=wojciech.drewek@intel.com \
--cc=xiyou.wangcong@gmail.com \
--cc=zhangkaiheb@126.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).