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-rw-r--r--include/uapi/linux/ila.h7
-rw-r--r--net/ipv6/ila/ila.h16
-rw-r--r--net/ipv6/ila/ila_common.c74
-rw-r--r--net/ipv6/ila/ila_lwt.c14
-rw-r--r--net/ipv6/ila/ila_xlat.c16
5 files changed, 112 insertions, 15 deletions
diff --git a/include/uapi/linux/ila.h b/include/uapi/linux/ila.h
index cd97951680bf..948c0a91e11b 100644
--- a/include/uapi/linux/ila.h
+++ b/include/uapi/linux/ila.h
@@ -15,6 +15,7 @@ enum {
ILA_ATTR_IFINDEX, /* s32 */
ILA_ATTR_DIR, /* u32 */
ILA_ATTR_PAD,
+ ILA_ATTR_CSUM_MODE, /* u8 */
__ILA_ATTR_MAX,
};
@@ -35,4 +36,10 @@ enum {
#define ILA_DIR_IN (1 << 0)
#define ILA_DIR_OUT (1 << 1)
+enum {
+ ILA_CSUM_ADJUST_TRANSPORT,
+ ILA_CSUM_NEUTRAL_MAP,
+ ILA_CSUM_NO_ACTION,
+};
+
#endif /* _UAPI_LINUX_ILA_H */
diff --git a/net/ipv6/ila/ila.h b/net/ipv6/ila/ila.h
index f532967d9ed7..d08fd2d48a78 100644
--- a/net/ipv6/ila/ila.h
+++ b/net/ipv6/ila/ila.h
@@ -36,11 +36,13 @@ struct ila_identifier {
union {
struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
- u8 __space:5;
+ u8 __space:4;
+ u8 csum_neutral:1;
u8 type:3;
#elif defined(__BIG_ENDIAN_BITFIELD)
u8 type:3;
- u8 __space:5;
+ u8 csum_neutral:1;
+ u8 __space:4;
#else
#error "Adjust your <asm/byteorder.h> defines"
#endif
@@ -64,6 +66,8 @@ enum {
ILA_ATYPE_RSVD_3,
};
+#define CSUM_NEUTRAL_FLAG htonl(0x10000000)
+
struct ila_addr {
union {
struct in6_addr addr;
@@ -88,6 +92,7 @@ struct ila_params {
struct ila_locator locator;
struct ila_locator locator_match;
__wsum csum_diff;
+ u8 csum_mode;
};
static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
@@ -99,8 +104,15 @@ static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
return csum_partial(diff, sizeof(diff), 0);
}
+static inline bool ila_csum_neutral_set(struct ila_identifier ident)
+{
+ return !!(ident.csum_neutral);
+}
+
void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p);
+void ila_init_saved_csum(struct ila_params *p);
+
int ila_lwt_init(void);
void ila_lwt_fini(void);
int ila_xlat_init(void);
diff --git a/net/ipv6/ila/ila_common.c b/net/ipv6/ila/ila_common.c
index c3078d0b64e1..0e94042d1289 100644
--- a/net/ipv6/ila/ila_common.c
+++ b/net/ipv6/ila/ila_common.c
@@ -17,21 +17,50 @@ static __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p)
{
struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);
- if (iaddr->loc.v64 == p->locator_match.v64)
+ if (p->locator_match.v64)
return p->csum_diff;
else
return compute_csum_diff8((__be32 *)&iaddr->loc,
(__be32 *)&p->locator);
}
-void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p)
+static void ila_csum_do_neutral(struct ila_addr *iaddr,
+ struct ila_params *p)
+{
+ __sum16 *adjust = (__force __sum16 *)&iaddr->ident.v16[3];
+ __wsum diff, fval;
+
+ /* Check if checksum adjust value has been cached */
+ if (p->locator_match.v64) {
+ diff = p->csum_diff;
+ } else {
+ diff = compute_csum_diff8((__be32 *)iaddr,
+ (__be32 *)&p->locator);
+ }
+
+ fval = (__force __wsum)(ila_csum_neutral_set(iaddr->ident) ?
+ ~CSUM_NEUTRAL_FLAG : CSUM_NEUTRAL_FLAG);
+
+ diff = csum_add(diff, fval);
+
+ *adjust = ~csum_fold(csum_add(diff, csum_unfold(*adjust)));
+
+ /* Flip the csum-neutral bit. Either we are doing a SIR->ILA
+ * translation with ILA_CSUM_NEUTRAL_MAP as the csum_method
+ * and the C-bit is not set, or we are doing an ILA-SIR
+ * tranlsation and the C-bit is set.
+ */
+ iaddr->ident.csum_neutral ^= 1;
+}
+
+static void ila_csum_adjust_transport(struct sk_buff *skb,
+ struct ila_params *p)
{
__wsum diff;
struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);
size_t nhoff = sizeof(struct ipv6hdr);
- /* First update checksum */
switch (ip6h->nexthdr) {
case NEXTHDR_TCP:
if (likely(pskb_may_pull(skb, nhoff + sizeof(struct tcphdr)))) {
@@ -74,6 +103,45 @@ void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p)
iaddr->loc = p->locator;
}
+void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p)
+{
+ struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);
+
+ /* First deal with the transport checksum */
+ if (ila_csum_neutral_set(iaddr->ident)) {
+ /* C-bit is set in the locator indicating that this
+ * is a locator being translated to a SIR address.
+ * Perform (receiver) checksum-neutral translation.
+ */
+ ila_csum_do_neutral(iaddr, p);
+ } else {
+ switch (p->csum_mode) {
+ case ILA_CSUM_ADJUST_TRANSPORT:
+ ila_csum_adjust_transport(skb, p);
+ break;
+ case ILA_CSUM_NEUTRAL_MAP:
+ ila_csum_do_neutral(iaddr, p);
+ break;
+ case ILA_CSUM_NO_ACTION:
+ break;
+ }
+ }
+
+ /* Now change destination address */
+ iaddr->loc = p->locator;
+}
+
+void ila_init_saved_csum(struct ila_params *p)
+{
+ if (!p->locator_match.v64)
+ return;
+
+ p->csum_diff = compute_csum_diff8(
+ (__be32 *)&p->locator_match,
+ (__be32 *)&p->locator);
+}
+
static int __init ila_init(void)
{
int ret;
diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
index de7f6d76e928..4985e1a735a6 100644
--- a/net/ipv6/ila/ila_lwt.c
+++ b/net/ipv6/ila/ila_lwt.c
@@ -53,6 +53,7 @@ drop:
static struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
[ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
+ [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, },
};
static int ila_build_state(struct net_device *dev, struct nlattr *nla,
@@ -79,8 +80,10 @@ static int ila_build_state(struct net_device *dev, struct nlattr *nla,
iaddr = (struct ila_addr *)&cfg6->fc_dst;
- if (!ila_addr_is_ila(iaddr)) {
- /* Don't allow setting a translation for a non-ILA address */
+ if (!ila_addr_is_ila(iaddr) || ila_csum_neutral_set(iaddr->ident)) {
+ /* Don't allow translation for a non-ILA address or checksum
+ * neutral flag to be set.
+ */
return -EINVAL;
}
@@ -108,6 +111,11 @@ static int ila_build_state(struct net_device *dev, struct nlattr *nla,
p->csum_diff = compute_csum_diff8(
(__be32 *)&p->locator_match, (__be32 *)&p->locator);
+ if (tb[ILA_ATTR_CSUM_MODE])
+ p->csum_mode = nla_get_u8(tb[ILA_ATTR_CSUM_MODE]);
+
+ ila_init_saved_csum(p);
+
newts->type = LWTUNNEL_ENCAP_ILA;
newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
LWTUNNEL_STATE_INPUT_REDIRECT;
@@ -125,6 +133,8 @@ static int ila_fill_encap_info(struct sk_buff *skb,
if (nla_put_u64_64bit(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator.v64,
ILA_ATTR_PAD))
goto nla_put_failure;
+ if (nla_put_u64(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
+ goto nla_put_failure;
return 0;
diff --git a/net/ipv6/ila/ila_xlat.c b/net/ipv6/ila/ila_xlat.c
index 2e6cb97aee19..a90e57229c6c 100644
--- a/net/ipv6/ila/ila_xlat.c
+++ b/net/ipv6/ila/ila_xlat.c
@@ -132,6 +132,7 @@ static struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
[ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
[ILA_ATTR_LOCATOR_MATCH] = { .type = NLA_U64, },
[ILA_ATTR_IFINDEX] = { .type = NLA_U32, },
+ [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, },
};
static int parse_nl_config(struct genl_info *info,
@@ -147,6 +148,9 @@ static int parse_nl_config(struct genl_info *info,
xp->ip.locator_match.v64 = (__force __be64)nla_get_u64(
info->attrs[ILA_ATTR_LOCATOR_MATCH]);
+ if (info->attrs[ILA_ATTR_CSUM_MODE])
+ xp->ip.csum_mode = nla_get_u8(info->attrs[ILA_ATTR_CSUM_MODE]);
+
if (info->attrs[ILA_ATTR_IFINDEX])
xp->ifindex = nla_get_s32(info->attrs[ILA_ATTR_IFINDEX]);
@@ -249,14 +253,9 @@ static int ila_add_mapping(struct net *net, struct ila_xlat_params *xp)
if (!ila)
return -ENOMEM;
- ila->xp = *xp;
+ ila_init_saved_csum(&xp->ip);
- /* Precompute checksum difference for translation since we
- * know both the old identifier and the new one.
- */
- ila->xp.ip.csum_diff = compute_csum_diff8(
- (__be32 *)&xp->ip.locator_match,
- (__be32 *)&xp->ip.locator);
+ ila->xp = *xp;
order = ila_order(ila);
@@ -408,7 +407,8 @@ static int ila_fill_info(struct ila_map *ila, struct sk_buff *msg)
nla_put_u64_64bit(msg, ILA_ATTR_LOCATOR_MATCH,
(__force u64)ila->xp.ip.locator_match.v64,
ILA_ATTR_PAD) ||
- nla_put_s32(msg, ILA_ATTR_IFINDEX, ila->xp.ifindex))
+ nla_put_s32(msg, ILA_ATTR_IFINDEX, ila->xp.ifindex) ||
+ nla_put_u32(msg, ILA_ATTR_CSUM_MODE, ila->xp.ip.csum_mode))
return -1;
return 0;
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-13 17:02:41 +0000