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/*
* teamd_hash_func.c - Hash function preparation for teamd
* Copyright (C) 2012-2013 Jiri Pirko <jiri@resnulli.us>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <linux/filter.h>
#include <private/misc.h>
#include <team.h>
#include "teamd.h"
#include "teamd_config.h"
#include "teamd_bpf_chef.h"
static const struct teamd_bpf_desc_frag eth_hdr_frag = {
.name = "eth",
.hproto = PROTO_ETH,
};
static const struct teamd_bpf_desc_frag vlan_hdr_frag = {
.name = "vlan",
.hproto = PROTO_VLAN,
};
static const struct teamd_bpf_desc_frag ipv4_hdr_frag = {
.name = "ipv4",
.hproto = PROTO_IPV4,
};
static const struct teamd_bpf_desc_frag ipv6_hdr_frag = {
.name = "ipv6",
.hproto = PROTO_IPV6,
};
static const struct teamd_bpf_desc_frag ip_hdr_frag = {
.name = "ip",
.hproto = PROTO_IP,
};
static const struct teamd_bpf_desc_frag l3_hdr_frag = {
.name = "l3",
.hproto = PROTO_L3,
};
static const struct teamd_bpf_desc_frag l4_hdr_frag = {
.name = "l4",
.hproto = PROTO_L4,
};
static const struct teamd_bpf_desc_frag tcp_hdr_frag = {
.name = "tcp",
.hproto = PROTO_TCP,
};
static const struct teamd_bpf_desc_frag udp_hdr_frag = {
.name = "udp",
.hproto = PROTO_UDP,
};
static const struct teamd_bpf_desc_frag sctp_hdr_frag = {
.name = "sctp",
.hproto = PROTO_SCTP,
};
static const struct teamd_bpf_desc_frag *frags[] = {
ð_hdr_frag,
&vlan_hdr_frag,
&ipv4_hdr_frag,
&ipv6_hdr_frag,
&ip_hdr_frag,
&l3_hdr_frag,
&l4_hdr_frag,
&tcp_hdr_frag,
&udp_hdr_frag,
&sctp_hdr_frag,
};
static const size_t frags_count = ARRAY_SIZE(frags);
static const struct teamd_bpf_desc_frag *__find_frag(const char *frag_name)
{
int i;
for (i = 0; i < frags_count; i++) {
if (!strcmp(frag_name, frags[i]->name))
return frags[i];
}
return NULL;
}
static int teamd_hash_func_init(struct teamd_context *ctx, struct sock_fprog *fprog)
{
int i;
int err;
teamd_bpf_desc_compile_start(fprog);
teamd_config_for_each_arr_index(i, ctx, "$.runner.tx_hash") {
const struct teamd_bpf_desc_frag *frag;
const char *frag_name;
err = teamd_config_string_get(ctx, &frag_name,
"$.runner.tx_hash[%d]", i);
if (err)
continue;
frag = __find_frag(frag_name);
if (!frag) {
teamd_log_warn("Hash frag named \"%s\" not found.",
frag_name);
continue;
}
err = teamd_bpf_desc_add_frag(fprog, frag);
if (err)
goto release;
}
err = teamd_bpf_desc_compile(fprog);
if (err)
goto release;
err = teamd_bpf_desc_compile_finish(fprog);
if (err)
goto release;
return 0;
release:
teamd_bpf_desc_compile_release(fprog);
return err;
}
static void teamd_hash_func_fini(struct sock_fprog *fprog)
{
teamd_bpf_desc_compile_release(fprog);
}
static const char *teamd_hash_default_frags[] = {
"eth", "ipv4", "ipv6",
};
static int teamd_hash_func_add_default_frags(struct teamd_context *ctx)
{
int i;
int err;
for (i = 0; i < ARRAY_SIZE(teamd_hash_default_frags); i++) {
err = teamd_config_arr_string_append(ctx,
teamd_hash_default_frags[i],
"$.runner.tx_hash");
if (err)
return err;
}
return 0;
}
int teamd_hash_func_set(struct teamd_context *ctx)
{
struct sock_fprog fprog;
int err;
if (!teamd_config_path_exists(ctx, "$.runner.tx_hash")) {
teamd_log_dbg("No Tx hash recipe found in config.");
err = teamd_hash_func_add_default_frags(ctx);
if (err)
return err;
}
err = teamd_hash_func_init(ctx, &fprog);
if (err) {
teamd_log_err("Failed to init hash function.");
return err;
}
err = team_set_bpf_hash_func(ctx->th, &fprog);
if (err)
teamd_log_err("Failed to set hash function.");
teamd_hash_func_fini(&fprog);
return err;
}
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