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author | Andrea Mayer <andrea.mayer@uniroma2.it> | 2023-08-12 21:09:25 +0300 |
---|---|---|
committer | Jakub Kicinski <kuba@kernel.org> | 2023-08-16 04:51:47 +0300 |
commit | 7458575a07f1c6768e46b8eac6e09a358804c9f6 (patch) | |
tree | e857f1727cc19f510e168e524dc18f26d8a37074 | |
parent | c65dffc6f25c59e3c637ab4e124f8686a08f3c15 (diff) | |
download | linux-7458575a07f1c6768e46b8eac6e09a358804c9f6.tar.xz |
seg6: add NEXT-C-SID support for SRv6 End.X behavior
The NEXT-C-SID mechanism described in [1] offers the possibility of
encoding several SRv6 segments within a single 128 bit SID address. Such
a SID address is called a Compressed SID (C-SID) container. In this way,
the length of the SID List can be drastically reduced.
A SID instantiated with the NEXT-C-SID flavor considers an IPv6 address
logically structured in three main blocks: i) Locator-Block; ii)
Locator-Node Function; iii) Argument.
C-SID container
+------------------------------------------------------------------+
| Locator-Block |Loc-Node| Argument |
| |Function| |
+------------------------------------------------------------------+
<--------- B -----------> <- NF -> <------------- A --------------->
(i) The Locator-Block can be any IPv6 prefix available to the provider;
(ii) The Locator-Node Function represents the node and the function to
be triggered when a packet is received on the node;
(iii) The Argument carries the remaining C-SIDs in the current C-SID
container.
This patch leverages the NEXT-C-SID mechanism previously introduced in the
Linux SRv6 subsystem [2] to support SID compression capabilities in the
SRv6 End.X behavior [3].
An SRv6 End.X behavior with NEXT-C-SID flavor works as an End.X behavior
but it is capable of processing the compressed SID List encoded in C-SID
containers.
An SRv6 End.X behavior with NEXT-C-SID flavor can be configured to support
user-provided Locator-Block and Locator-Node Function lengths. In this
implementation, such lengths must be evenly divisible by 8 (i.e. must be
byte-aligned), otherwise the kernel informs the user about invalid
values with a meaningful error code and message through netlink_ext_ack.
If Locator-Block and/or Locator-Node Function lengths are not provided
by the user during configuration of an SRv6 End.X behavior instance with
NEXT-C-SID flavor, the kernel will choose their default values i.e.,
32-bit Locator-Block and 16-bit Locator-Node Function.
[1] - https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-srh-compression
[2] - https://lore.kernel.org/all/20220912171619.16943-1-andrea.mayer@uniroma2.it/
[3] - https://datatracker.ietf.org/doc/html/rfc8986#name-endx-l3-cross-connect
Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20230812180926.16689-2-andrea.mayer@uniroma2.it
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r-- | net/ipv6/seg6_local.c | 108 |
1 files changed, 88 insertions, 20 deletions
diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c index dd433cc265c8..24e2b4b494cb 100644 --- a/net/ipv6/seg6_local.c +++ b/net/ipv6/seg6_local.c @@ -109,15 +109,19 @@ struct bpf_lwt_prog { #define next_csid_chk_lcnode_fn_bits(flen) \ next_csid_chk_lcblock_bits(flen) +/* flag indicating that flavors are set up for a given End* behavior */ +#define SEG6_F_LOCAL_FLAVORS SEG6_F_ATTR(SEG6_LOCAL_FLAVORS) + #define SEG6_F_LOCAL_FLV_OP(flvname) BIT(SEG6_LOCAL_FLV_OP_##flvname) +#define SEG6_F_LOCAL_FLV_NEXT_CSID SEG6_F_LOCAL_FLV_OP(NEXT_CSID) #define SEG6_F_LOCAL_FLV_PSP SEG6_F_LOCAL_FLV_OP(PSP) /* Supported RFC8986 Flavor operations are reported in this bitmask */ #define SEG6_LOCAL_FLV8986_SUPP_OPS SEG6_F_LOCAL_FLV_PSP -/* Supported Flavor operations are reported in this bitmask */ -#define SEG6_LOCAL_FLV_SUPP_OPS (SEG6_F_LOCAL_FLV_OP(NEXT_CSID) | \ +#define SEG6_LOCAL_END_FLV_SUPP_OPS (SEG6_F_LOCAL_FLV_NEXT_CSID | \ SEG6_LOCAL_FLV8986_SUPP_OPS) +#define SEG6_LOCAL_END_X_FLV_SUPP_OPS SEG6_F_LOCAL_FLV_NEXT_CSID struct seg6_flavors_info { /* Flavor operations */ @@ -411,9 +415,72 @@ static int end_next_csid_core(struct sk_buff *skb, struct seg6_local_lwt *slwt) return input_action_end_finish(skb, slwt); } +static int input_action_end_x_finish(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + seg6_lookup_nexthop(skb, &slwt->nh6, 0); + + return dst_input(skb); +} + +static int input_action_end_x_core(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + struct ipv6_sr_hdr *srh; + + srh = get_and_validate_srh(skb); + if (!srh) + goto drop; + + advance_nextseg(srh, &ipv6_hdr(skb)->daddr); + + return input_action_end_x_finish(skb, slwt); + +drop: + kfree_skb(skb); + return -EINVAL; +} + +static int end_x_next_csid_core(struct sk_buff *skb, + struct seg6_local_lwt *slwt) +{ + const struct seg6_flavors_info *finfo = &slwt->flv_info; + struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; + + if (seg6_next_csid_is_arg_zero(daddr, finfo)) + return input_action_end_x_core(skb, slwt); + + /* update DA */ + seg6_next_csid_advance_arg(daddr, finfo); + + return input_action_end_x_finish(skb, slwt); +} + static bool seg6_next_csid_enabled(__u32 fops) { - return fops & BIT(SEG6_LOCAL_FLV_OP_NEXT_CSID); + return fops & SEG6_F_LOCAL_FLV_NEXT_CSID; +} + +/* Processing of SRv6 End, End.X, and End.T behaviors can be extended through + * the flavors framework. These behaviors must report the subset of (flavor) + * operations they currently implement. In this way, if a user specifies a + * flavor combination that is not supported by a given End* behavior, the + * kernel refuses to instantiate the tunnel reporting the error. + */ +static int seg6_flv_supp_ops_by_action(int action, __u32 *fops) +{ + switch (action) { + case SEG6_LOCAL_ACTION_END: + *fops = SEG6_LOCAL_END_FLV_SUPP_OPS; + break; + case SEG6_LOCAL_ACTION_END_X: + *fops = SEG6_LOCAL_END_X_FLV_SUPP_OPS; + break; + default: + return -EOPNOTSUPP; + } + + return 0; } /* We describe the packet state in relation to the absence/presence of the SRH @@ -746,21 +813,14 @@ static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt) /* regular endpoint, and forward to specified nexthop */ static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt) { - struct ipv6_sr_hdr *srh; - - srh = get_and_validate_srh(skb); - if (!srh) - goto drop; - - advance_nextseg(srh, &ipv6_hdr(skb)->daddr); - - seg6_lookup_nexthop(skb, &slwt->nh6, 0); + const struct seg6_flavors_info *finfo = &slwt->flv_info; + __u32 fops = finfo->flv_ops; - return dst_input(skb); + /* check for the presence of NEXT-C-SID since it applies first */ + if (seg6_next_csid_enabled(fops)) + return end_x_next_csid_core(skb, slwt); -drop: - kfree_skb(skb); - return -EINVAL; + return input_action_end_x_core(skb, slwt); } static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt) @@ -1404,13 +1464,14 @@ static struct seg6_action_desc seg6_action_table[] = { .action = SEG6_LOCAL_ACTION_END, .attrs = 0, .optattrs = SEG6_F_LOCAL_COUNTERS | - SEG6_F_ATTR(SEG6_LOCAL_FLAVORS), + SEG6_F_LOCAL_FLAVORS, .input = input_action_end, }, { .action = SEG6_LOCAL_ACTION_END_X, .attrs = SEG6_F_ATTR(SEG6_LOCAL_NH6), - .optattrs = SEG6_F_LOCAL_COUNTERS, + .optattrs = SEG6_F_LOCAL_COUNTERS | + SEG6_F_LOCAL_FLAVORS, .input = input_action_end_x, }, { @@ -2070,7 +2131,8 @@ static int parse_nla_flavors(struct nlattr **attrs, struct seg6_local_lwt *slwt, { struct seg6_flavors_info *finfo = &slwt->flv_info; struct nlattr *tb[SEG6_LOCAL_FLV_MAX + 1]; - unsigned long fops; + int action = slwt->action; + __u32 fops, supp_fops; int rc; rc = nla_parse_nested_deprecated(tb, SEG6_LOCAL_FLV_MAX, @@ -2086,7 +2148,8 @@ static int parse_nla_flavors(struct nlattr **attrs, struct seg6_local_lwt *slwt, return -EINVAL; fops = nla_get_u32(tb[SEG6_LOCAL_FLV_OPERATION]); - if (fops & ~SEG6_LOCAL_FLV_SUPP_OPS) { + rc = seg6_flv_supp_ops_by_action(action, &supp_fops); + if (rc < 0 || (fops & ~supp_fops)) { NL_SET_ERR_MSG(extack, "Unsupported Flavor operation(s)"); return -EOPNOTSUPP; } @@ -2618,6 +2681,11 @@ int __init seg6_local_init(void) */ BUILD_BUG_ON(SEG6_LOCAL_MAX + 1 > BITS_PER_TYPE(unsigned long)); + /* Check whether the number of defined flavors exceeds the maximum + * allowed value. + */ + BUILD_BUG_ON(SEG6_LOCAL_FLV_OP_MAX + 1 > BITS_PER_TYPE(__u32)); + /* If the default NEXT-C-SID Locator-Block/Node Function lengths (in * bits) have been changed with invalid values, kernel build stops * here. |