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authorOliver Hartkopp <socketcan@hartkopp.net>2019-08-10 21:18:10 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2019-08-13 17:32:21 +0200
commit456a8a646b2563438c16a9b27decf9aa717f1ebb (patch)
tree4af45d1dc678b1479a13915bfc9c306961b0d9e9 /net
parente9dc7c60507c822992e793bd3845f0556ae0ff98 (diff)
downloadlinux-456a8a646b2563438c16a9b27decf9aa717f1ebb.tar.bz2
can: gw: add support for CAN FD frames
Introduce CAN FD support which needs an extension of the netlink API to pass CAN FD type content to the kernel which has a different size to Classic CAN. Additionally the struct canfd_frame has a new 'flags' element that can now be modified with can-gw. The new CGW_FLAGS_CAN_FD option flag defines whether the routing job handles Classic CAN or CAN FD frames. This setting is very strict at reception time and enables the new possibilities, e.g. CGW_FDMOD_* and modifying the flags element of struct canfd_frame, only when CGW_FLAGS_CAN_FD is set. Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net')
-rw-r--r--net/can/gw.c214
1 files changed, 187 insertions, 27 deletions
diff --git a/net/can/gw.c b/net/can/gw.c
index 3a1ad206fbef..65d60c93af29 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -1,7 +1,7 @@
// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
/* gw.c - CAN frame Gateway/Router/Bridge with netlink interface
*
- * Copyright (c) 2017 Volkswagen Group Electronic Research
+ * Copyright (c) 2019 Volkswagen Group Electronic Research
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -59,7 +59,7 @@
#include <net/net_namespace.h>
#include <net/sock.h>
-#define CAN_GW_VERSION "20170425"
+#define CAN_GW_VERSION "20190810"
#define CAN_GW_NAME "can-gw"
MODULE_DESCRIPTION("PF_CAN netlink gateway");
@@ -156,17 +156,50 @@ struct cgw_job {
MODFUNC(mod_and_id, cf->can_id &= mod->modframe.and.can_id)
MODFUNC(mod_and_len, cf->len &= mod->modframe.and.len)
+MODFUNC(mod_and_flags, cf->flags &= mod->modframe.and.flags)
MODFUNC(mod_and_data, *(u64 *)cf->data &= *(u64 *)mod->modframe.and.data)
MODFUNC(mod_or_id, cf->can_id |= mod->modframe.or.can_id)
MODFUNC(mod_or_len, cf->len |= mod->modframe.or.len)
+MODFUNC(mod_or_flags, cf->flags |= mod->modframe.or.flags)
MODFUNC(mod_or_data, *(u64 *)cf->data |= *(u64 *)mod->modframe.or.data)
MODFUNC(mod_xor_id, cf->can_id ^= mod->modframe.xor.can_id)
MODFUNC(mod_xor_len, cf->len ^= mod->modframe.xor.len)
+MODFUNC(mod_xor_flags, cf->flags ^= mod->modframe.xor.flags)
MODFUNC(mod_xor_data, *(u64 *)cf->data ^= *(u64 *)mod->modframe.xor.data)
MODFUNC(mod_set_id, cf->can_id = mod->modframe.set.can_id)
MODFUNC(mod_set_len, cf->len = mod->modframe.set.len)
+MODFUNC(mod_set_flags, cf->flags = mod->modframe.set.flags)
MODFUNC(mod_set_data, *(u64 *)cf->data = *(u64 *)mod->modframe.set.data)
+static void mod_and_fddata(struct canfd_frame *cf, struct cf_mod *mod)
+{
+ int i;
+
+ for (i = 0; i < CANFD_MAX_DLEN; i += 8)
+ *(u64 *)(cf->data + i) &= *(u64 *)(mod->modframe.and.data + i);
+}
+
+static void mod_or_fddata(struct canfd_frame *cf, struct cf_mod *mod)
+{
+ int i;
+
+ for (i = 0; i < CANFD_MAX_DLEN; i += 8)
+ *(u64 *)(cf->data + i) |= *(u64 *)(mod->modframe.or.data + i);
+}
+
+static void mod_xor_fddata(struct canfd_frame *cf, struct cf_mod *mod)
+{
+ int i;
+
+ for (i = 0; i < CANFD_MAX_DLEN; i += 8)
+ *(u64 *)(cf->data + i) ^= *(u64 *)(mod->modframe.xor.data + i);
+}
+
+static void mod_set_fddata(struct canfd_frame *cf, struct cf_mod *mod)
+{
+ memcpy(cf->data, mod->modframe.set.data, CANFD_MAX_DLEN);
+}
+
static void canframecpy(struct canfd_frame *dst, struct can_frame *src)
{
/* Copy the struct members separately to ensure that no uninitialized
@@ -179,10 +212,26 @@ static void canframecpy(struct canfd_frame *dst, struct can_frame *src)
*(u64 *)dst->data = *(u64 *)src->data;
}
-static int cgw_chk_csum_parms(s8 fr, s8 to, s8 re)
+static void canfdframecpy(struct canfd_frame *dst, struct canfd_frame *src)
+{
+ /* Copy the struct members separately to ensure that no uninitialized
+ * data are copied in the 2 bytes hole of the struct. This is needed
+ * to make easy compares of the data in the struct cf_mod.
+ */
+
+ dst->can_id = src->can_id;
+ dst->flags = src->flags;
+ dst->len = src->len;
+ memcpy(dst->data, src->data, CANFD_MAX_DLEN);
+}
+
+static int cgw_chk_csum_parms(s8 fr, s8 to, s8 re, struct rtcanmsg *r)
{
s8 dlen = CAN_MAX_DLEN;
+ if (r->flags & CGW_FLAGS_CAN_FD)
+ dlen = CANFD_MAX_DLEN;
+
/* absolute dlc values 0 .. 7 => 0 .. 7, e.g. data [0]
* relative to received dlc -1 .. -8 :
* e.g. for received dlc = 8
@@ -351,6 +400,15 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
struct sk_buff *nskb;
int modidx = 0;
+ /* process strictly Classic CAN or CAN FD frames */
+ if (gwj->flags & CGW_FLAGS_CAN_FD) {
+ if (skb->len != CANFD_MTU)
+ return;
+ } else {
+ if (skb->len != CAN_MTU)
+ return;
+ }
+
/* Do not handle CAN frames routed more than 'max_hops' times.
* In general we should never catch this delimiter which is intended
* to cover a misconfiguration protection (e.g. circular CAN routes).
@@ -419,23 +477,19 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
int max_len = nskb->len - offsetof(struct canfd_frame, data);
/* dlc may have changed, make sure it fits to the CAN frame */
- if (cf->len > max_len)
- goto out_delete;
-
- /* check for checksum updates in classic CAN length only */
- if (gwj->mod.csumfunc.crc8) {
- if (cf->len > 8)
- goto out_delete;
-
- (*gwj->mod.csumfunc.crc8)(cf, &gwj->mod.csum.crc8);
+ if (cf->len > max_len) {
+ /* delete frame due to misconfiguration */
+ gwj->deleted_frames++;
+ kfree_skb(nskb);
+ return;
}
- if (gwj->mod.csumfunc.xor) {
- if (cf->len > 8)
- goto out_delete;
+ /* check for checksum updates */
+ if (gwj->mod.csumfunc.crc8)
+ (*gwj->mod.csumfunc.crc8)(cf, &gwj->mod.csum.crc8);
+ if (gwj->mod.csumfunc.xor)
(*gwj->mod.csumfunc.xor)(cf, &gwj->mod.csum.xor);
- }
}
/* clear the skb timestamp if not configured the other way */
@@ -447,13 +501,6 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
gwj->dropped_frames++;
else
gwj->handled_frames++;
-
- return;
-
- out_delete:
- /* delete frame due to misconfiguration */
- gwj->deleted_frames++;
- kfree_skb(nskb);
}
static inline int cgw_register_filter(struct net *net, struct cgw_job *gwj)
@@ -535,7 +582,37 @@ static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj, int type,
goto cancel;
}
- if (1) {
+ if (gwj->flags & CGW_FLAGS_CAN_FD) {
+ struct cgw_fdframe_mod mb;
+
+ if (gwj->mod.modtype.and) {
+ memcpy(&mb.cf, &gwj->mod.modframe.and, sizeof(mb.cf));
+ mb.modtype = gwj->mod.modtype.and;
+ if (nla_put(skb, CGW_FDMOD_AND, sizeof(mb), &mb) < 0)
+ goto cancel;
+ }
+
+ if (gwj->mod.modtype.or) {
+ memcpy(&mb.cf, &gwj->mod.modframe.or, sizeof(mb.cf));
+ mb.modtype = gwj->mod.modtype.or;
+ if (nla_put(skb, CGW_FDMOD_OR, sizeof(mb), &mb) < 0)
+ goto cancel;
+ }
+
+ if (gwj->mod.modtype.xor) {
+ memcpy(&mb.cf, &gwj->mod.modframe.xor, sizeof(mb.cf));
+ mb.modtype = gwj->mod.modtype.xor;
+ if (nla_put(skb, CGW_FDMOD_XOR, sizeof(mb), &mb) < 0)
+ goto cancel;
+ }
+
+ if (gwj->mod.modtype.set) {
+ memcpy(&mb.cf, &gwj->mod.modframe.set, sizeof(mb.cf));
+ mb.modtype = gwj->mod.modtype.set;
+ if (nla_put(skb, CGW_FDMOD_SET, sizeof(mb), &mb) < 0)
+ goto cancel;
+ }
+ } else {
struct cgw_frame_mod mb;
if (gwj->mod.modtype.and) {
@@ -645,6 +722,10 @@ static const struct nla_policy cgw_policy[CGW_MAX + 1] = {
[CGW_FILTER] = { .len = sizeof(struct can_filter) },
[CGW_LIM_HOPS] = { .type = NLA_U8 },
[CGW_MOD_UID] = { .type = NLA_U32 },
+ [CGW_FDMOD_AND] = { .len = sizeof(struct cgw_fdframe_mod) },
+ [CGW_FDMOD_OR] = { .len = sizeof(struct cgw_fdframe_mod) },
+ [CGW_FDMOD_XOR] = { .len = sizeof(struct cgw_fdframe_mod) },
+ [CGW_FDMOD_SET] = { .len = sizeof(struct cgw_fdframe_mod) },
};
/* check for common and gwtype specific attributes */
@@ -652,6 +733,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
u8 gwtype, void *gwtypeattr, u8 *limhops)
{
struct nlattr *tb[CGW_MAX + 1];
+ struct rtcanmsg *r = nlmsg_data(nlh);
int modidx = 0;
int err = 0;
@@ -671,7 +753,85 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
}
/* check for AND/OR/XOR/SET modifications */
- if (1) {
+ if (r->flags & CGW_FLAGS_CAN_FD) {
+ struct cgw_fdframe_mod mb;
+
+ if (tb[CGW_FDMOD_AND]) {
+ nla_memcpy(&mb, tb[CGW_FDMOD_AND], CGW_FDMODATTR_LEN);
+
+ canfdframecpy(&mod->modframe.and, &mb.cf);
+ mod->modtype.and = mb.modtype;
+
+ if (mb.modtype & CGW_MOD_ID)
+ mod->modfunc[modidx++] = mod_and_id;
+
+ if (mb.modtype & CGW_MOD_LEN)
+ mod->modfunc[modidx++] = mod_and_len;
+
+ if (mb.modtype & CGW_MOD_FLAGS)
+ mod->modfunc[modidx++] = mod_and_flags;
+
+ if (mb.modtype & CGW_MOD_DATA)
+ mod->modfunc[modidx++] = mod_and_fddata;
+ }
+
+ if (tb[CGW_FDMOD_OR]) {
+ nla_memcpy(&mb, tb[CGW_FDMOD_OR], CGW_FDMODATTR_LEN);
+
+ canfdframecpy(&mod->modframe.or, &mb.cf);
+ mod->modtype.or = mb.modtype;
+
+ if (mb.modtype & CGW_MOD_ID)
+ mod->modfunc[modidx++] = mod_or_id;
+
+ if (mb.modtype & CGW_MOD_LEN)
+ mod->modfunc[modidx++] = mod_or_len;
+
+ if (mb.modtype & CGW_MOD_FLAGS)
+ mod->modfunc[modidx++] = mod_or_flags;
+
+ if (mb.modtype & CGW_MOD_DATA)
+ mod->modfunc[modidx++] = mod_or_fddata;
+ }
+
+ if (tb[CGW_FDMOD_XOR]) {
+ nla_memcpy(&mb, tb[CGW_FDMOD_XOR], CGW_FDMODATTR_LEN);
+
+ canfdframecpy(&mod->modframe.xor, &mb.cf);
+ mod->modtype.xor = mb.modtype;
+
+ if (mb.modtype & CGW_MOD_ID)
+ mod->modfunc[modidx++] = mod_xor_id;
+
+ if (mb.modtype & CGW_MOD_LEN)
+ mod->modfunc[modidx++] = mod_xor_len;
+
+ if (mb.modtype & CGW_MOD_FLAGS)
+ mod->modfunc[modidx++] = mod_xor_flags;
+
+ if (mb.modtype & CGW_MOD_DATA)
+ mod->modfunc[modidx++] = mod_xor_fddata;
+ }
+
+ if (tb[CGW_FDMOD_SET]) {
+ nla_memcpy(&mb, tb[CGW_FDMOD_SET], CGW_FDMODATTR_LEN);
+
+ canfdframecpy(&mod->modframe.set, &mb.cf);
+ mod->modtype.set = mb.modtype;
+
+ if (mb.modtype & CGW_MOD_ID)
+ mod->modfunc[modidx++] = mod_set_id;
+
+ if (mb.modtype & CGW_MOD_LEN)
+ mod->modfunc[modidx++] = mod_set_len;
+
+ if (mb.modtype & CGW_MOD_FLAGS)
+ mod->modfunc[modidx++] = mod_set_flags;
+
+ if (mb.modtype & CGW_MOD_DATA)
+ mod->modfunc[modidx++] = mod_set_fddata;
+ }
+ } else {
struct cgw_frame_mod mb;
if (tb[CGW_MOD_AND]) {
@@ -745,7 +905,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
struct cgw_csum_crc8 *c = nla_data(tb[CGW_CS_CRC8]);
err = cgw_chk_csum_parms(c->from_idx, c->to_idx,
- c->result_idx);
+ c->result_idx, r);
if (err)
return err;
@@ -768,7 +928,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
struct cgw_csum_xor *c = nla_data(tb[CGW_CS_XOR]);
err = cgw_chk_csum_parms(c->from_idx, c->to_idx,
- c->result_idx);
+ c->result_idx, r);
if (err)
return err;