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Message-ID: <20170730161436.29967-5-david.lebrun@uclouvain.be>
Date: Sun, 30 Jul 2017 18:14:35 +0200
From: David Lebrun <david.lebrun@...ouvain.be>
To: <netdev@...r.kernel.org>
CC: David Lebrun <david.lebrun@...ouvain.be>
Subject: [RFC PATCH net-next 4/5] ipv6: sr: add rtnetlink functions for seg6local action parameters
This patch adds the necessary functions to parse, fill, and compare
seg6local rtnetlink attributes, for all defined action parameters.
- The SRH parameter defines an SRH to be inserted or encapsulated.
- The TABLE parameter defines the table to use for the route lookup of
the next segment or the inner decapsulated packet.
- The NH4 parameter defines the IPv4 next-hop for an inner decapsulated
IPv4 packet.
- The NH6 parameter defines the IPv6 next-hop for the next segment or
for an inner decapsulated IPv6 packet
- The IIF parameter defines an ingress interface index.
- The OIF parameter defines an egress interface index.
Signed-off-by: David Lebrun <david.lebrun@...ouvain.be>
---
net/ipv6/seg6_local.c | 211 +++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 193 insertions(+), 18 deletions(-)
diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index 53615d7..ab1fc1b 100644
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -104,6 +104,181 @@ static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
[SEG6_LOCAL_OIF] = { .type = NLA_U32 },
};
+static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ struct ipv6_sr_hdr *srh;
+ int len;
+
+ srh = nla_data(attrs[SEG6_LOCAL_SRH]);
+ len = nla_len(attrs[SEG6_LOCAL_SRH]);
+
+ /* SRH must contain at least one segment */
+ if (len < sizeof(*srh) + sizeof(struct in6_addr))
+ return -EINVAL;
+
+ if (!seg6_validate_srh(srh, len))
+ return -EINVAL;
+
+ slwt->srh = kmalloc(len, GFP_KERNEL);
+ if (!slwt->srh)
+ return -ENOMEM;
+
+ memcpy(slwt->srh, srh, len);
+
+ slwt->headroom += len;
+
+ return 0;
+}
+
+static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct ipv6_sr_hdr *srh;
+ struct nlattr *nla;
+ int len;
+
+ srh = slwt->srh;
+ len = (srh->hdrlen + 1) << 3;
+
+ nla = nla_reserve(skb, SEG6_LOCAL_SRH, len);
+ if (!nla)
+ return -EMSGSIZE;
+
+ memcpy(nla_data(nla), srh, len);
+
+ return 0;
+}
+
+static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ int len = (a->srh->hdrlen + 1) << 3;
+
+ if (len != ((b->srh->hdrlen + 1) << 3))
+ return 1;
+
+ return memcmp(a->srh, b->srh, len);
+}
+
+static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]);
+
+ return 0;
+}
+
+static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ if (a->table != b->table)
+ return 1;
+
+ return 0;
+}
+
+static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]),
+ sizeof(struct in_addr));
+
+ return 0;
+}
+
+static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct nlattr *nla;
+
+ nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr));
+ if (!nla)
+ return -EMSGSIZE;
+
+ memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr));
+
+ return 0;
+}
+
+static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr));
+}
+
+static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]),
+ sizeof(struct in6_addr));
+
+ return 0;
+}
+
+static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ struct nlattr *nla;
+
+ nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr));
+ if (!nla)
+ return -EMSGSIZE;
+
+ memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr));
+
+ return 0;
+}
+
+static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr));
+}
+
+static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]);
+
+ return 0;
+}
+
+static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ if (a->iif != b->iif)
+ return 1;
+
+ return 0;
+}
+
+static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]);
+
+ return 0;
+}
+
+static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
+{
+ if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
+{
+ if (a->oif != b->oif)
+ return 1;
+
+ return 0;
+}
+
struct seg6_action_param {
int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt);
int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
@@ -111,29 +286,29 @@ struct seg6_action_param {
};
static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
- [SEG6_LOCAL_SRH] = { .parse = NULL,
- .put = NULL,
- .cmp = NULL },
+ [SEG6_LOCAL_SRH] = { .parse = parse_nla_srh,
+ .put = put_nla_srh,
+ .cmp = cmp_nla_srh },
- [SEG6_LOCAL_TABLE] = { .parse = NULL,
- .put = NULL,
- .cmp = NULL },
+ [SEG6_LOCAL_TABLE] = { .parse = parse_nla_table,
+ .put = put_nla_table,
+ .cmp = cmp_nla_table },
- [SEG6_LOCAL_NH4] = { .parse = NULL,
- .put = NULL,
- .cmp = NULL },
+ [SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4,
+ .put = put_nla_nh4,
+ .cmp = cmp_nla_nh4 },
- [SEG6_LOCAL_NH6] = { .parse = NULL,
- .put = NULL,
- .cmp = NULL },
+ [SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6,
+ .put = put_nla_nh6,
+ .cmp = cmp_nla_nh6 },
- [SEG6_LOCAL_IIF] = { .parse = NULL,
- .put = NULL,
- .cmp = NULL },
+ [SEG6_LOCAL_IIF] = { .parse = parse_nla_iif,
+ .put = put_nla_iif,
+ .cmp = cmp_nla_iif },
- [SEG6_LOCAL_OIF] = { .parse = NULL,
- .put = NULL,
- .cmp = NULL },
+ [SEG6_LOCAL_OIF] = { .parse = parse_nla_oif,
+ .put = put_nla_oif,
+ .cmp = cmp_nla_oif },
};
static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)
--
2.10.2
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