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Message-Id: <20220126184628.26013-3-justin.iurman@uliege.be>
Date: Wed, 26 Jan 2022 19:46:28 +0100
From: Justin Iurman <justin.iurman@...ege.be>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, yoshfuji@...ux-ipv6.org,
dsahern@...nel.org, justin.iurman@...ege.be
Subject: [PATCH net-next 2/2] ipv6: ioam: Insertion frequency in lwtunnel output
Add support for the IOAM insertion frequency inside its lwtunnel output
function. This patch introduces a new (atomic) counter for packets,
based on which the algorithm will decide if IOAM should be added or not.
Default frequency is "1/1" (i.e., applied to all packets) for backward
compatibility. The iproute2 patch is ready and will be submitted as soon
as this one is accepted.
Previous iproute2 command:
ip -6 ro ad fc00::1/128 encap ioam6 [ mode ... ] ...
New iproute2 command:
ip -6 ro ad fc00::1/128 encap ioam6 [ freq k/n ] [ mode ... ] ...
Signed-off-by: Justin Iurman <justin.iurman@...ege.be>
---
net/ipv6/ioam6_iptunnel.c | 57 +++++++++++++++++++++++++++++++++++++--
1 file changed, 55 insertions(+), 2 deletions(-)
diff --git a/net/ipv6/ioam6_iptunnel.c b/net/ipv6/ioam6_iptunnel.c
index f90a87389fcc..3dfce3e4ae19 100644
--- a/net/ipv6/ioam6_iptunnel.c
+++ b/net/ipv6/ioam6_iptunnel.c
@@ -32,13 +32,25 @@ struct ioam6_lwt_encap {
struct ioam6_trace_hdr traceh;
} __packed;
+struct ioam6_lwt_freq {
+ int k;
+ int n;
+};
+
struct ioam6_lwt {
struct dst_cache cache;
+ struct ioam6_lwt_freq freq;
+ atomic_t pkt_cnt;
u8 mode;
struct in6_addr tundst;
struct ioam6_lwt_encap tuninfo;
};
+static struct netlink_range_validation_signed freq_range = {
+ .min = IOAM6_IPTUNNEL_FREQ_MIN,
+ .max = IOAM6_IPTUNNEL_FREQ_MAX,
+};
+
static struct ioam6_lwt *ioam6_lwt_state(struct lwtunnel_state *lwt)
{
return (struct ioam6_lwt *)lwt->data;
@@ -55,6 +67,8 @@ static struct ioam6_trace_hdr *ioam6_lwt_trace(struct lwtunnel_state *lwt)
}
static const struct nla_policy ioam6_iptunnel_policy[IOAM6_IPTUNNEL_MAX + 1] = {
+ [IOAM6_IPTUNNEL_FREQ_K] = NLA_POLICY_FULL_RANGE_SIGNED(NLA_S32, &freq_range),
+ [IOAM6_IPTUNNEL_FREQ_N] = NLA_POLICY_FULL_RANGE_SIGNED(NLA_S32, &freq_range),
[IOAM6_IPTUNNEL_MODE] = NLA_POLICY_RANGE(NLA_U8,
IOAM6_IPTUNNEL_MODE_MIN,
IOAM6_IPTUNNEL_MODE_MAX),
@@ -96,6 +110,7 @@ static int ioam6_build_state(struct net *net, struct nlattr *nla,
struct lwtunnel_state *lwt;
struct ioam6_lwt *ilwt;
int len_aligned, err;
+ int freq_k, freq_n;
u8 mode;
if (family != AF_INET6)
@@ -106,6 +121,23 @@ static int ioam6_build_state(struct net *net, struct nlattr *nla,
if (err < 0)
return err;
+ if ((!tb[IOAM6_IPTUNNEL_FREQ_K] && tb[IOAM6_IPTUNNEL_FREQ_N]) ||
+ (tb[IOAM6_IPTUNNEL_FREQ_K] && !tb[IOAM6_IPTUNNEL_FREQ_N])) {
+ NL_SET_ERR_MSG(extack, "freq: missing parameter");
+ return -EINVAL;
+ } else if (!tb[IOAM6_IPTUNNEL_FREQ_K] && !tb[IOAM6_IPTUNNEL_FREQ_N]) {
+ freq_k = IOAM6_IPTUNNEL_FREQ_MIN;
+ freq_n = IOAM6_IPTUNNEL_FREQ_MIN;
+ } else {
+ freq_k = nla_get_s32(tb[IOAM6_IPTUNNEL_FREQ_K]);
+ freq_n = nla_get_s32(tb[IOAM6_IPTUNNEL_FREQ_N]);
+
+ if (freq_k > freq_n) {
+ NL_SET_ERR_MSG(extack, "freq: k > n is forbidden");
+ return -EINVAL;
+ }
+ }
+
if (!tb[IOAM6_IPTUNNEL_MODE])
mode = IOAM6_IPTUNNEL_MODE_INLINE;
else
@@ -140,6 +172,10 @@ static int ioam6_build_state(struct net *net, struct nlattr *nla,
return err;
}
+ atomic_set(&ilwt->pkt_cnt, 0);
+ ilwt->freq.k = freq_k;
+ ilwt->freq.n = freq_n;
+
ilwt->mode = mode;
if (tb[IOAM6_IPTUNNEL_DST])
ilwt->tundst = nla_get_in6_addr(tb[IOAM6_IPTUNNEL_DST]);
@@ -268,6 +304,11 @@ static int ioam6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
goto drop;
ilwt = ioam6_lwt_state(dst->lwtstate);
+
+ /* Check for insertion frequency (i.e., "k over n" insertions) */
+ if (atomic_fetch_inc(&ilwt->pkt_cnt) % ilwt->freq.n >= ilwt->freq.k)
+ goto out;
+
orig_daddr = ipv6_hdr(skb)->daddr;
switch (ilwt->mode) {
@@ -358,6 +399,14 @@ static int ioam6_fill_encap_info(struct sk_buff *skb,
struct ioam6_lwt *ilwt = ioam6_lwt_state(lwtstate);
int err;
+ err = nla_put_s32(skb, IOAM6_IPTUNNEL_FREQ_K, ilwt->freq.k);
+ if (err)
+ goto ret;
+
+ err = nla_put_s32(skb, IOAM6_IPTUNNEL_FREQ_N, ilwt->freq.n);
+ if (err)
+ goto ret;
+
err = nla_put_u8(skb, IOAM6_IPTUNNEL_MODE, ilwt->mode);
if (err)
goto ret;
@@ -379,7 +428,9 @@ static int ioam6_encap_nlsize(struct lwtunnel_state *lwtstate)
struct ioam6_lwt *ilwt = ioam6_lwt_state(lwtstate);
int nlsize;
- nlsize = nla_total_size(sizeof(ilwt->mode)) +
+ nlsize = nla_total_size(sizeof(ilwt->freq.k)) +
+ nla_total_size(sizeof(ilwt->freq.n)) +
+ nla_total_size(sizeof(ilwt->mode)) +
nla_total_size(sizeof(ilwt->tuninfo.traceh));
if (ilwt->mode != IOAM6_IPTUNNEL_MODE_INLINE)
@@ -395,7 +446,9 @@ static int ioam6_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
struct ioam6_lwt *ilwt_a = ioam6_lwt_state(a);
struct ioam6_lwt *ilwt_b = ioam6_lwt_state(b);
- return (ilwt_a->mode != ilwt_b->mode ||
+ return (ilwt_a->freq.k != ilwt_b->freq.k ||
+ ilwt_a->freq.n != ilwt_b->freq.n ||
+ ilwt_a->mode != ilwt_b->mode ||
(ilwt_a->mode != IOAM6_IPTUNNEL_MODE_INLINE &&
!ipv6_addr_equal(&ilwt_a->tundst, &ilwt_b->tundst)) ||
trace_a->namespace_id != trace_b->namespace_id);
--
2.25.1
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