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Message-Id: <20210930113844.1829373-7-razor@blackwall.org>
Date: Thu, 30 Sep 2021 14:38:38 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: netdev@...r.kernel.org
Cc: roopa@...dia.com, donaldsharp72@...il.com, dsahern@...il.com,
idosch@...sch.org, Nikolay Aleksandrov <nikolay@...dia.com>
Subject: [PATCH iproute2-next 06/12] ip: nexthop: parse attributes into nh entry structure before printing
From: Nikolay Aleksandrov <nikolay@...dia.com>
Factor out the nexthop attribute parsing and parse attributes into a
nexthop entry structure which is then used to print.
Signed-off-by: Nikolay Aleksandrov <nikolay@...dia.com>
---
ip/ipnexthop.c | 186 ++++++++++++++++++++++++++++++++++++-------------
1 file changed, 139 insertions(+), 47 deletions(-)
diff --git a/ip/ipnexthop.c b/ip/ipnexthop.c
index 7094d6cbb5e6..0edb3c265b6f 100644
--- a/ip/ipnexthop.c
+++ b/ip/ipnexthop.c
@@ -213,28 +213,29 @@ out:
return rc;
}
-static void print_nh_group(FILE *fp, const struct rtattr *grps_attr)
+static bool __valid_nh_group_attr(const struct rtattr *g_attr)
{
- struct nexthop_grp *nhg = RTA_DATA(grps_attr);
- int num = RTA_PAYLOAD(grps_attr) / sizeof(*nhg);
- int i;
+ int num = RTA_PAYLOAD(g_attr) / sizeof(struct nexthop_grp);
- if (!num || num * sizeof(*nhg) != RTA_PAYLOAD(grps_attr)) {
- fprintf(fp, "<invalid nexthop group>");
- return;
- }
+ return num && num * sizeof(struct nexthop_grp) == RTA_PAYLOAD(g_attr);
+}
+
+static void print_nh_group(const struct nh_entry *nhe)
+{
+ int i;
open_json_array(PRINT_JSON, "group");
print_string(PRINT_FP, NULL, "%s", "group ");
- for (i = 0; i < num; ++i) {
+ for (i = 0; i < nhe->nh_groups_cnt; ++i) {
open_json_object(NULL);
if (i)
print_string(PRINT_FP, NULL, "%s", "/");
- print_uint(PRINT_ANY, "id", "%u", nhg[i].id);
- if (nhg[i].weight)
- print_uint(PRINT_ANY, "weight", ",%u", nhg[i].weight + 1);
+ print_uint(PRINT_ANY, "id", "%u", nhe->nh_groups[i].id);
+ if (nhe->nh_groups[i].weight)
+ print_uint(PRINT_ANY, "weight", ",%u",
+ nhe->nh_groups[i].weight + 1);
close_json_object();
}
@@ -254,15 +255,13 @@ static const char *nh_group_type_name(__u16 type)
}
}
-static void print_nh_group_type(FILE *fp, const struct rtattr *grp_type_attr)
+static void print_nh_group_type(__u16 nh_grp_type)
{
- __u16 type = rta_getattr_u16(grp_type_attr);
-
- if (type == NEXTHOP_GRP_TYPE_MPATH)
+ if (nh_grp_type == NEXTHOP_GRP_TYPE_MPATH)
/* Do not print type in order not to break existing output. */
return;
- print_string(PRINT_ANY, "type", "type %s ", nh_group_type_name(type));
+ print_string(PRINT_ANY, "type", "type %s ", nh_group_type_name(nh_grp_type));
}
static void parse_nh_res_group_rta(const struct rtattr *res_grp_attr,
@@ -340,12 +339,104 @@ static void print_nh_res_bucket(FILE *fp, const struct rtattr *res_bucket_attr)
close_json_object();
}
+static void ipnh_destroy_entry(struct nh_entry *nhe)
+{
+ if (nhe->nh_encap)
+ free(nhe->nh_encap);
+ if (nhe->nh_groups)
+ free(nhe->nh_groups);
+}
+
+/* parse nhmsg into nexthop entry struct which must be destroyed by
+ * ipnh_destroy_enty when it's not needed anymore
+ */
+static int ipnh_parse_nhmsg(FILE *fp, const struct nhmsg *nhm, int len,
+ struct nh_entry *nhe)
+{
+ struct rtattr *tb[NHA_MAX+1];
+ int err = 0;
+
+ memset(nhe, 0, sizeof(*nhe));
+ parse_rtattr_flags(tb, NHA_MAX, RTM_NHA(nhm), len, NLA_F_NESTED);
+
+ if (tb[NHA_ID])
+ nhe->nh_id = rta_getattr_u32(tb[NHA_ID]);
+
+ if (tb[NHA_OIF])
+ nhe->nh_oif = rta_getattr_u32(tb[NHA_OIF]);
+
+ if (tb[NHA_GROUP_TYPE])
+ nhe->nh_grp_type = rta_getattr_u16(tb[NHA_GROUP_TYPE]);
+
+ if (tb[NHA_GATEWAY]) {
+ if (RTA_PAYLOAD(tb[NHA_GATEWAY]) > sizeof(nhe->nh_gateway)) {
+ fprintf(fp, "<nexthop id %u invalid gateway length %lu>\n",
+ nhe->nh_id, RTA_PAYLOAD(tb[NHA_GATEWAY]));
+ err = -EINVAL;
+ goto out_err;
+ }
+ nhe->nh_gateway_len = RTA_PAYLOAD(tb[NHA_GATEWAY]);
+ memcpy(&nhe->nh_gateway, RTA_DATA(tb[NHA_GATEWAY]),
+ RTA_PAYLOAD(tb[NHA_GATEWAY]));
+ }
+
+ if (tb[NHA_ENCAP]) {
+ nhe->nh_encap = malloc(RTA_LENGTH(RTA_PAYLOAD(tb[NHA_ENCAP])));
+ if (!nhe->nh_encap) {
+ err = -ENOMEM;
+ goto out_err;
+ }
+ memcpy(nhe->nh_encap, tb[NHA_ENCAP],
+ RTA_LENGTH(RTA_PAYLOAD(tb[NHA_ENCAP])));
+ memcpy(&nhe->nh_encap_type, tb[NHA_ENCAP_TYPE],
+ sizeof(nhe->nh_encap_type));
+ }
+
+ if (tb[NHA_GROUP]) {
+ if (!__valid_nh_group_attr(tb[NHA_GROUP])) {
+ fprintf(fp, "<nexthop id %u invalid nexthop group>",
+ nhe->nh_id);
+ err = -EINVAL;
+ goto out_err;
+ }
+
+ nhe->nh_groups = malloc(RTA_PAYLOAD(tb[NHA_GROUP]));
+ if (!nhe->nh_groups) {
+ err = -ENOMEM;
+ goto out_err;
+ }
+ nhe->nh_groups_cnt = RTA_PAYLOAD(tb[NHA_GROUP]) /
+ sizeof(struct nexthop_grp);
+ memcpy(nhe->nh_groups, RTA_DATA(tb[NHA_GROUP]),
+ RTA_PAYLOAD(tb[NHA_GROUP]));
+ }
+
+ if (tb[NHA_RES_GROUP]) {
+ parse_nh_res_group_rta(tb[NHA_RES_GROUP], &nhe->nh_res_grp);
+ nhe->nh_has_res_grp = true;
+ }
+
+ nhe->nh_blackhole = !!tb[NHA_BLACKHOLE];
+ nhe->nh_fdb = !!tb[NHA_FDB];
+
+ nhe->nh_family = nhm->nh_family;
+ nhe->nh_protocol = nhm->nh_protocol;
+ nhe->nh_scope = nhm->nh_scope;
+ nhe->nh_flags = nhm->nh_flags;
+
+ return 0;
+
+out_err:
+ ipnh_destroy_entry(nhe);
+ return err;
+}
+
int print_nexthop(struct nlmsghdr *n, void *arg)
{
struct nhmsg *nhm = NLMSG_DATA(n);
- struct rtattr *tb[NHA_MAX+1];
FILE *fp = (FILE *)arg;
- int len;
+ struct nh_entry nhe;
+ int len, err;
SPRINT_BUF(b1);
@@ -366,60 +457,61 @@ int print_nexthop(struct nlmsghdr *n, void *arg)
if (filter.proto && filter.proto != nhm->nh_protocol)
return 0;
- parse_rtattr_flags(tb, NHA_MAX, RTM_NHA(nhm), len, NLA_F_NESTED);
-
+ err = ipnh_parse_nhmsg(fp, nhm, len, &nhe);
+ if (err) {
+ close_json_object();
+ fprintf(stderr, "Error parsing nexthop: %s\n", strerror(-err));
+ return -1;
+ }
open_json_object(NULL);
if (n->nlmsg_type == RTM_DELNEXTHOP)
print_bool(PRINT_ANY, "deleted", "Deleted ", true);
- if (tb[NHA_ID])
- print_uint(PRINT_ANY, "id", "id %u ",
- rta_getattr_u32(tb[NHA_ID]));
+ print_uint(PRINT_ANY, "id", "id %u ", nhe.nh_id);
- if (tb[NHA_GROUP])
- print_nh_group(fp, tb[NHA_GROUP]);
+ if (nhe.nh_groups)
+ print_nh_group(&nhe);
- if (tb[NHA_GROUP_TYPE])
- print_nh_group_type(fp, tb[NHA_GROUP_TYPE]);
+ print_nh_group_type(nhe.nh_grp_type);
- if (tb[NHA_RES_GROUP]) {
- struct nha_res_grp res_grp;
+ if (nhe.nh_has_res_grp)
+ print_nh_res_group(&nhe.nh_res_grp);
- parse_nh_res_group_rta(tb[NHA_RES_GROUP], &res_grp);
- print_nh_res_group(&res_grp);
- }
+ if (nhe.nh_encap)
+ lwt_print_encap(fp, &nhe.nh_encap_type.rta, nhe.nh_encap);
- if (tb[NHA_ENCAP])
- lwt_print_encap(fp, tb[NHA_ENCAP_TYPE], tb[NHA_ENCAP]);
+ if (nhe.nh_gateway_len)
+ __print_rta_gateway(fp, nhe.nh_family,
+ format_host(nhe.nh_family,
+ nhe.nh_gateway_len,
+ &nhe.nh_gateway));
- if (tb[NHA_GATEWAY])
- print_rta_gateway(fp, nhm->nh_family, tb[NHA_GATEWAY]);
+ if (nhe.nh_oif)
+ print_rta_ifidx(fp, nhe.nh_oif, "dev");
- if (tb[NHA_OIF])
- print_rta_ifidx(fp, rta_getattr_u32(tb[NHA_OIF]), "dev");
-
- if (nhm->nh_scope != RT_SCOPE_UNIVERSE || show_details > 0) {
+ if (nhe.nh_scope != RT_SCOPE_UNIVERSE || show_details > 0) {
print_string(PRINT_ANY, "scope", "scope %s ",
- rtnl_rtscope_n2a(nhm->nh_scope, b1, sizeof(b1)));
+ rtnl_rtscope_n2a(nhe.nh_scope, b1, sizeof(b1)));
}
- if (tb[NHA_BLACKHOLE])
+ if (nhe.nh_blackhole)
print_null(PRINT_ANY, "blackhole", "blackhole ", NULL);
- if (nhm->nh_protocol != RTPROT_UNSPEC || show_details > 0) {
+ if (nhe.nh_protocol != RTPROT_UNSPEC || show_details > 0) {
print_string(PRINT_ANY, "protocol", "proto %s ",
- rtnl_rtprot_n2a(nhm->nh_protocol, b1, sizeof(b1)));
+ rtnl_rtprot_n2a(nhe.nh_protocol, b1, sizeof(b1)));
}
- print_rt_flags(fp, nhm->nh_flags);
+ print_rt_flags(fp, nhe.nh_flags);
- if (tb[NHA_FDB])
+ if (nhe.nh_fdb)
print_null(PRINT_ANY, "fdb", "fdb", NULL);
print_string(PRINT_FP, NULL, "%s", "\n");
close_json_object();
fflush(fp);
+ ipnh_destroy_entry(&nhe);
return 0;
}
--
2.31.1
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