quoted text > This still had two bugs:
> - policies for IPVS_DEST_ATTR_FWD_METHOD and IPVS_SVC_ATTR_FLAGS
> were swapped
> - svc not initialized to NULL at the beginning of ip_vs_genl_set_cmd()
>
> The version below fixes this:
>
> ----
> Add the implementation of the new Generic Netlink interface to IPVS and
> keep the old set/getsockopt interface for userspace backwards
> compatibility.
>
> Signed-off-by: Julius Volz <juliusv@google.com>
>
> 1 files changed, 880 insertions(+), 0 deletions(-)
>
> diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/ipv4/ipvs/ip_vs_ctl.c
> index 9a5ace0..8038420 100644
> --- a/net/ipv4/ipvs/ip_vs_ctl.c
> +++ b/net/ipv4/ipvs/ip_vs_ctl.c
> @@ -37,6 +37,7 @@
> #include <net/ip.h>
> #include <net/route.h>
> #include <net/sock.h>
> +#include <net/genetlink.h>
>
> #include <asm/uaccess.h>
>
> @@ -2305,6 +2306,877 @@ static struct nf_sockopt_ops ip_vs_sockopts = {
> .owner = THIS_MODULE,
> };
>
> +/*
> + * Generic Netlink interface
> + */
> +
> +/* IPVS genetlink family */
> +static struct genl_family ip_vs_genl_family = {
> + .id = GENL_ID_GENERATE,
> + .hdrsize = 0,
> + .name = IPVS_GENL_NAME,
> + .version = IPVS_GENL_VERSION,
> + .maxattr = IPVS_CMD_MAX,
> +};
> +
> +/* Policy used for first-level command attributes */
> +static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
> + [IPVS_CMD_ATTR_SERVICE] = { .type = NLA_NESTED },
> + [IPVS_CMD_ATTR_DEST] = { .type = NLA_NESTED },
> + [IPVS_CMD_ATTR_DAEMON] = { .type = NLA_NESTED },
> + [IPVS_CMD_ATTR_TIMEOUT_TCP] = { .type = NLA_U32 },
> + [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
> + [IPVS_CMD_ATTR_TIMEOUT_UDP] = { .type = NLA_U32 },
> +};
> +
> +/* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
> +static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
> + [IPVS_DAEMON_ATTR_STATE] = { .type = NLA_U32 },
> + [IPVS_DAEMON_ATTR_MCAST_IFN] = { .type = NLA_NUL_STRING,
> + .len = IP_VS_IFNAME_MAXLEN },
> + [IPVS_DAEMON_ATTR_SYNC_ID] = { .type = NLA_U32 },
> +};
> +
> +/* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
> +static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
> + [IPVS_SVC_ATTR_AF] = { .type = NLA_U16 },
> + [IPVS_SVC_ATTR_PROTOCOL] = { .type = NLA_U16 },
> + [IPVS_SVC_ATTR_ADDR] = { .type = NLA_BINARY,
> + .len = sizeof(union nf_inet_addr) },
> + [IPVS_SVC_ATTR_PORT] = { .type = NLA_U16 },
> + [IPVS_SVC_ATTR_FWMARK] = { .type = NLA_U32 },
> + [IPVS_SVC_ATTR_SCHED_NAME] = { .type = NLA_NUL_STRING,
> + .len = IP_VS_SCHEDNAME_MAXLEN },
> + [IPVS_SVC_ATTR_FLAGS] = { .type = NLA_BINARY,
> + .len = sizeof(struct ip_vs_flags) },
> + [IPVS_SVC_ATTR_TIMEOUT] = { .type = NLA_U32 },
> + [IPVS_SVC_ATTR_NETMASK] = { .type = NLA_U32 },
> + [IPVS_SVC_ATTR_STATS] = { .type = NLA_NESTED },
> +};
> +
> +/* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
> +static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
> + [IPVS_DEST_ATTR_ADDR] = { .type = NLA_BINARY,
> + .len = sizeof(union nf_inet_addr) },
> + [IPVS_DEST_ATTR_PORT] = { .type = NLA_U16 },
> + [IPVS_DEST_ATTR_FWD_METHOD] = { .type = NLA_U32 },
> + [IPVS_DEST_ATTR_WEIGHT] = { .type = NLA_U32 },
> + [IPVS_DEST_ATTR_U_THRESH] = { .type = NLA_U32 },
> + [IPVS_DEST_ATTR_L_THRESH] = { .type = NLA_U32 },
> + [IPVS_DEST_ATTR_ACTIVE_CONNS] = { .type = NLA_U32 },
> + [IPVS_DEST_ATTR_INACT_CONNS] = { .type = NLA_U32 },
> + [IPVS_DEST_ATTR_PERSIST_CONNS] = { .type = NLA_U32 },
> + [IPVS_DEST_ATTR_STATS] = { .type = NLA_NESTED },
> +};
> +
> +static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
> + struct ip_vs_stats *stats)
> +{
> + struct nlattr *nl_stats = nla_nest_start(skb, container_type);
> + if (!nl_stats)
> + return -EMSGSIZE;
> +
> + spin_lock_bh(&stats->lock);
> +
> + NLA_PUT_U32(skb, IPVS_STATS_ATTR_CONNS, stats->conns);
> + NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPKTS, stats->inpkts);
> + NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPKTS, stats->outpkts);
> + NLA_PUT_U64(skb, IPVS_STATS_ATTR_INBYTES, stats->inbytes);
> + NLA_PUT_U64(skb, IPVS_STATS_ATTR_OUTBYTES, stats->outbytes);
> + NLA_PUT_U32(skb, IPVS_STATS_ATTR_CPS, stats->cps);
> + NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPPS, stats->inpps);
> + NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPPS, stats->outpps);
> + NLA_PUT_U32(skb, IPVS_STATS_ATTR_INBPS, stats->inbps);
> + NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTBPS, stats->outbps);
> +
> + spin_unlock_bh(&stats->lock);
> +
> + nla_nest_end(skb, nl_stats);
> +
> + return 0;
> +
> +nla_put_failure:
> + spin_unlock_bh(&stats->lock);
> + nla_nest_cancel(skb, nl_stats);
> + return -EMSGSIZE;
> +}
> +
> +static int ip_vs_genl_fill_service(struct sk_buff *skb,
> + struct ip_vs_service *svc)
> +{
> + struct nlattr *nl_service;
> + struct ip_vs_flags flags = { .flags = svc->flags,
> + .mask = ~0 };
> +
> + nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
> + if (!nl_service)
> + return -EMSGSIZE;
> +
> + NLA_PUT_U16(skb, IPVS_SVC_ATTR_AF, AF_INET);
> +
> + if (svc->fwmark) {
> + NLA_PUT_U32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark);
> + } else {
> + NLA_PUT_U16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol);
> + NLA_PUT(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr);
> + NLA_PUT_U16(skb, IPVS_SVC_ATTR_PORT, svc->port);
> + }
> +
> + NLA_PUT_STRING(skb, IPVS_SVC_ATTR_SCHED_NAME, svc->scheduler->name);
> + NLA_PUT(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags);
> + NLA_PUT_U32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ);
> + NLA_PUT_U32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask);
> +
> + if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &svc->stats))
> + goto nla_put_failure;
> +
> + nla_nest_end(skb, nl_service);
> +
> + return 0;
> +
> +nla_put_failure:
> + nla_nest_cancel(skb, nl_service);
> + return -EMSGSIZE;
> +}
> +
> +static int ip_vs_genl_dump_service(struct sk_buff *skb,
> + struct ip_vs_service *svc,
> + struct netlink_callback *cb)
> +{
> + void *hdr;
> +
> + hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
> + &ip_vs_genl_family, NLM_F_MULTI,
> + IPVS_CMD_NEW_SERVICE);
> + if (!hdr)
> + return -EMSGSIZE;
> +
> + if (ip_vs_genl_fill_service(skb, svc) < 0)
> + goto nla_put_failure;
> +
> + return genlmsg_end(skb, hdr);
> +
> +nla_put_failure:
> + genlmsg_cancel(skb, hdr);
> + return -EMSGSIZE;
> +}
> +
> +static int ip_vs_genl_dump_services(struct sk_buff *skb,
> + struct netlink_callback *cb)
> +{
> + int idx = 0, i;
> + int start = cb->args[0];
> + struct ip_vs_service *svc;
> +
> + mutex_lock(&__ip_vs_mutex);
> + for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
> + list_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
> + if (++idx <= start)
> + continue;
> + if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
> + idx--;
> + goto nla_put_failure;
> + }
> + }
> + }
> +
> + for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
> + list_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
> + if (++idx <= start)
> + continue;
> + if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
> + idx--;
> + goto nla_put_failure;
> + }
> + }
> + }
> +
> +nla_put_failure:
> + mutex_unlock(&__ip_vs_mutex);
> + cb->args[0] = idx;
> +
> + return skb->len;
> +}
> +
> +static int ip_vs_genl_parse_service(struct ip_vs_service_user *usvc,
> + struct nlattr *nla, int full_entry)
> +{
> + struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
> + struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
> +
> + /* Parse mandatory identifying service fields first */
> + if (nla == NULL ||
> + nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
> + return -EINVAL;
> +
> + nla_af = attrs[IPVS_SVC_ATTR_AF];
> + nla_protocol = attrs[IPVS_SVC_ATTR_PROTOCOL];
> + nla_addr = attrs[IPVS_SVC_ATTR_ADDR];
> + nla_port = attrs[IPVS_SVC_ATTR_PORT];
> + nla_fwmark = attrs[IPVS_SVC_ATTR_FWMARK];
> +
> + if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
> + return -EINVAL;
> +
> + /* For now, only support IPv4 */
> + if (nla_get_u16(nla_af) != AF_INET)
> + return -EAFNOSUPPORT;
> +
> + if (nla_fwmark) {
> + usvc->protocol = IPPROTO_TCP;
> + usvc->fwmark = nla_get_u32(nla_fwmark);
> + } else {
> + usvc->protocol = nla_get_u16(nla_protocol);
> + nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
> + usvc->port = nla_get_u16(nla_port);
> + usvc->fwmark = 0;
> + }
> +
> + /* If a full entry was requested, check for the additional fields */
> + if (full_entry) {
> + struct nlattr *nla_sched, *nla_flags, *nla_timeout,
> + *nla_netmask;
> + struct ip_vs_flags flags;
> + struct ip_vs_service *svc;
> +
> + nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
> + nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
> + nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
> + nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
> +
> + if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
> + return -EINVAL;
> +
> + nla_memcpy(&flags, nla_flags, sizeof(flags));
> +
> + /* prefill flags from service if it already exists */
> + if (usvc->fwmark)
> + svc = __ip_vs_svc_fwm_get(usvc->fwmark);
> + else
> + svc = __ip_vs_service_get(usvc->protocol, usvc->addr,
> + usvc->port);
> + if (svc) {
> + usvc->flags = svc->flags;
> + ip_vs_service_put(svc);
> + } else
> + usvc->flags = 0;
> +
> + /* set new flags from userland */
> + usvc->flags = (usvc->flags & ~flags.mask) |
> + (flags.flags & flags.mask);
> +
> + strlcpy(usvc->sched_name, nla_data(nla_sched),
> + sizeof(usvc->sched_name));
> + usvc->timeout = nla_get_u32(nla_timeout);
> + usvc->netmask = nla_get_u32(nla_netmask);
> + }
> +
> + return 0;
> +}
> +
> +static struct ip_vs_service *ip_vs_genl_find_service(struct nlattr *nla)
> +{
> + struct ip_vs_service_user usvc;
> + int ret;
> +
> + ret = ip_vs_genl_parse_service(&usvc, nla, 0);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + if (usvc.fwmark)
> + return __ip_vs_svc_fwm_get(usvc.fwmark);
> + else
> + return __ip_vs_service_get(usvc.protocol, usvc.addr,
> + usvc.port);
> +}
> +
> +static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
> +{
> + struct nlattr *nl_dest;
> +
> + nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
> + if (!nl_dest)
> + return -EMSGSIZE;
> +
> + NLA_PUT(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr);
> + NLA_PUT_U16(skb, IPVS_DEST_ATTR_PORT, dest->port);
> +
> + NLA_PUT_U32(skb, IPVS_DEST_ATTR_FWD_METHOD,
> + atomic_read(&dest->conn_flags) & IP_VS_CONN_F_FWD_MASK);
> + NLA_PUT_U32(skb, IPVS_DEST_ATTR_WEIGHT, atomic_read(&dest->weight));
> + NLA_PUT_U32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold);
> + NLA_PUT_U32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold);
> + NLA_PUT_U32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
> + atomic_read(&dest->activeconns));
> + NLA_PUT_U32(skb, IPVS_DEST_ATTR_INACT_CONNS,
> + atomic_read(&dest->inactconns));
> + NLA_PUT_U32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
> + atomic_read(&dest->persistconns));
> +
> + if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &dest->stats))
> + goto nla_put_failure;
> +
> + nla_nest_end(skb, nl_dest);
> +
> + return 0;
> +
> +nla_put_failure:
> + nla_nest_cancel(skb, nl_dest);
> + return -EMSGSIZE;
> +}
> +
> +static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
> + struct netlink_callback *cb)
> +{
> + void *hdr;
> +
> + hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
> + &ip_vs_genl_family, NLM_F_MULTI,
> + IPVS_CMD_NEW_DEST);
> + if (!hdr)
> + return -EMSGSIZE;
> +
> + if (ip_vs_genl_fill_dest(skb, dest) < 0)
> + goto nla_put_failure;
> +
> + return genlmsg_end(skb, hdr);
> +
> +nla_put_failure:
> + genlmsg_cancel(skb, hdr);
> + return -EMSGSIZE;
> +}
> +
> +static int ip_vs_genl_dump_dests(struct sk_buff *skb,
> + struct netlink_callback *cb)
> +{
> + int idx = 0;
> + int start = cb->args[0];
> + struct ip_vs_service *svc;
> + struct ip_vs_dest *dest;
> + struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
> +
> + mutex_lock(&__ip_vs_mutex);
> +
> + /* Try to find the service for which to dump destinations */
> + if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
> + IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
> + goto out_err;
> +
> + svc = ip_vs_genl_find_service(attrs[IPVS_CMD_ATTR_SERVICE]);
> + if (IS_ERR(svc) || svc == NULL)
> + goto out_err;
> +
> + /* Dump the destinations */
> + list_for_each_entry(dest, &svc->destinations, n_list) {
> + if (++idx <= start)
> + continue;
> + if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
> + idx--;
> + goto nla_put_failure;
> + }
> + }
> +
> +nla_put_failure:
> + cb->args[0] = idx;
> + ip_vs_service_put(svc);
> +
> +out_err:
> + mutex_unlock(&__ip_vs_mutex);
> +
> + return skb->len;
> +}
> +
> +static int ip_vs_genl_parse_dest(struct ip_vs_dest_user *udest,
> + struct nlattr *nla, int full_entry)
> +{
> + struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
> + struct nlattr *nla_addr, *nla_port;
> +
> + /* Parse mandatory identifying destination fields first */
> + if (nla == NULL ||
> + nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
> + return -EINVAL;
> +
> + nla_addr = attrs[IPVS_DEST_ATTR_ADDR];
> + nla_port = attrs[IPVS_DEST_ATTR_PORT];
> +
> + if (!(nla_addr && nla_port))
> + return -EINVAL;
> +
> + nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
> + udest->port = nla_get_u16(nla_port);
> +
> + /* If a full entry was requested, check for the additional fields */
> + if (full_entry) {
> + struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
> + *nla_l_thresh;
> +
> + nla_fwd = attrs[IPVS_DEST_ATTR_FWD_METHOD];
> + nla_weight = attrs[IPVS_DEST_ATTR_WEIGHT];
> + nla_u_thresh = attrs[IPVS_DEST_ATTR_U_THRESH];
> + nla_l_thresh = attrs[IPVS_DEST_ATTR_L_THRESH];
> +
> + if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
> + return -EINVAL;
> +
> + udest->conn_flags = nla_get_u32(nla_fwd)
> + & IP_VS_CONN_F_FWD_MASK;
> + udest->weight = nla_get_u32(nla_weight);
> + udest->u_threshold = nla_get_u32(nla_u_thresh);
> + udest->l_threshold = nla_get_u32(nla_l_thresh);
> + }
> +
> + return 0;
> +}
> +
> +static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __be32 state,
> + const char *mcast_ifn, __be32 syncid)
> +{
> + struct nlattr *nl_daemon;
> +
> + nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
> + if (!nl_daemon)
> + return -EMSGSIZE;
> +
> + NLA_PUT_U32(skb, IPVS_DAEMON_ATTR_STATE, state);
> + NLA_PUT_STRING(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn);
> + NLA_PUT_U32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid);
> +
> + nla_nest_end(skb, nl_daemon);
> +
> + return 0;
> +
> +nla_put_failure:
> + nla_nest_cancel(skb, nl_daemon);
> + return -EMSGSIZE;
> +}
> +
> +static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __be32 state,
> + const char *mcast_ifn, __be32 syncid,
> + struct netlink_callback *cb)
> +{
> + void *hdr;
> + hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
> + &ip_vs_genl_family, NLM_F_MULTI,
> + IPVS_CMD_NEW_DAEMON);
> + if (!hdr)
> + return -EMSGSIZE;
> +
> + if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
> + goto nla_put_failure;
> +
> + return genlmsg_end(skb, hdr);
> +
> +nla_put_failure:
> + genlmsg_cancel(skb, hdr);
> + return -EMSGSIZE;
> +}
> +
> +static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
> + struct netlink_callback *cb)
> +{
> + mutex_lock(&__ip_vs_mutex);
> + if ((ip_vs_sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
> + if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
> + ip_vs_master_mcast_ifn,
> + ip_vs_master_syncid, cb) < 0)
> + goto nla_put_failure;
> +
> + cb->args[0] = 1;
> + }
> +
> + if ((ip_vs_sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
> + if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
> + ip_vs_backup_mcast_ifn,
> + ip_vs_backup_syncid, cb) < 0)
> + goto nla_put_failure;
> +
> + cb->args[1] = 1;
> + }
> +
> +nla_put_failure:
> + mutex_unlock(&__ip_vs_mutex);
> +
> + return skb->len;
> +}
> +
> +static int ip_vs_genl_new_daemon(struct nlattr **attrs)
> +{
> + if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
> + attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
> + attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
> + return -EINVAL;
> +
> + return start_sync_thread(nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
> + nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
> + nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
> +}
> +
> +static int ip_vs_genl_del_daemon(struct nlattr **attrs)
> +{
> + if (!attrs[IPVS_DAEMON_ATTR_STATE])
> + return -EINVAL;
> +
> + return stop_sync_thread(nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
> +}
> +
> +static int ip_vs_genl_set_config(struct nlattr **attrs)
> +{
> + struct ip_vs_timeout_user t;
> +
> + __ip_vs_get_timeouts(&t);
> +
> + if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
> + t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
> +
> + if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
> + t.tcp_fin_timeout =
> + nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
> +
> + if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
> + t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
> +
> + return ip_vs_set_timeout(&t);
> +}
> +
> +static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
> +{
> + struct ip_vs_service *svc = NULL;
> + struct ip_vs_service_user usvc;
> + struct ip_vs_dest_user udest;
> + int ret = 0, cmd;
> + int need_full_svc = 0, need_full_dest = 0;
> +
> + cmd = info->genlhdr->cmd;
> +
> + mutex_lock(&__ip_vs_mutex);
> +
> + if (cmd == IPVS_CMD_FLUSH) {
> + ret = ip_vs_flush();
> + goto out;
> + } else if (cmd == IPVS_CMD_SET_CONFIG) {
> + ret = ip_vs_genl_set_config(info->attrs);
> + goto out;
> + } else if (cmd == IPVS_CMD_NEW_DAEMON ||
> + cmd == IPVS_CMD_DEL_DAEMON) {
> +
> + struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
> +
> + if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
> + nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
> + info->attrs[IPVS_CMD_ATTR_DAEMON],
> + ip_vs_daemon_policy)) {
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + if (cmd == IPVS_CMD_NEW_DAEMON)
> + ret = ip_vs_genl_new_daemon(daemon_attrs);
> + else
> + ret = ip_vs_genl_del_daemon(daemon_attrs);
> + goto out;
> + } else if (cmd == IPVS_CMD_ZERO &&
> + !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
> + ret = ip_vs_zero_all();
> + goto out;
> + }
> +
> + /* All following commands require a service argument, so check if we
> + * received a valid one. We need a full service specification when
> + * adding / editing a service. Only identifying members otherwise. */
> + if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
> + need_full_svc = 1;
> +
> + ret = ip_vs_genl_parse_service(&usvc,
> + info->attrs[IPVS_CMD_ATTR_SERVICE],
> + need_full_svc);
> + if (ret)
> + goto out;
> +
> + /* Lookup the exact service by <protocol, addr, port> or fwmark */
> + if (usvc.fwmark == 0)
> + svc = __ip_vs_service_get(usvc.protocol, usvc.addr, usvc.port);
> + else
> + svc = __ip_vs_svc_fwm_get(usvc.fwmark);
> +
> + /* Unless we're adding a new service, the service must already exist */
> + if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
> + ret = -ESRCH;
> + goto out;
> + }
> +
> + /* Destination commands require a valid destination argument. For
> + * adding / editing a destination, we need a full destination
> + * specification. */
> + if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
> + cmd == IPVS_CMD_DEL_DEST) {
> + if (cmd != IPVS_CMD_DEL_DEST)
> + need_full_dest = 1;
> +
> + ret = ip_vs_genl_parse_dest(&udest,
> + info->attrs[IPVS_CMD_ATTR_DEST],
> + need_full_dest);
> + if (ret)
> + goto out;
> + }
> +
> + switch (cmd) {
> + case IPVS_CMD_NEW_SERVICE:
> + if (svc == NULL)
> + ret = ip_vs_add_service(&usvc, &svc);
> + else
> + ret = -EEXIST;
> + break;
> + case IPVS_CMD_SET_SERVICE:
> + ret = ip_vs_edit_service(svc, &usvc);
> + break;
> + case IPVS_CMD_DEL_SERVICE:
> + ret = ip_vs_del_service(svc);
> + break;
> + case IPVS_CMD_NEW_DEST:
> + ret = ip_vs_add_dest(svc, &udest);
> + break;
> + case IPVS_CMD_SET_DEST:
> + ret = ip_vs_edit_dest(svc, &udest);
> + break;
> + case IPVS_CMD_DEL_DEST:
> + ret = ip_vs_del_dest(svc, &udest);
> + break;
> + case IPVS_CMD_ZERO:
> + ret = ip_vs_zero_service(svc);
> + break;
> + default:
> + ret = -EINVAL;
> + }
> +
> +out:
> + if (svc)
> + ip_vs_service_put(svc);
> + mutex_unlock(&__ip_vs_mutex);
> +
> + return ret;
> +}
> +
> +static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
> +{
> + struct sk_buff *msg;
> + void *reply;
> + int ret, cmd, reply_cmd;
> +
> + mutex_lock(&__ip_vs_mutex);
> +
> + cmd = info->genlhdr->cmd;
> +
> + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
> + if (!msg) {
> + ret = -ENOMEM;
> + goto out_err;
> + }
> +
> + if (cmd == IPVS_CMD_GET_SERVICE)
> + reply_cmd = IPVS_CMD_NEW_SERVICE;
> + else if (cmd == IPVS_CMD_GET_INFO)
> + reply_cmd = IPVS_CMD_SET_INFO;
> + else if (cmd == IPVS_CMD_GET_CONFIG)
> + reply_cmd = IPVS_CMD_SET_CONFIG;
> + else {
> + IP_VS_ERR("unknown Generic Netlink command\n");
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
> + if (reply == NULL)
> + goto nla_put_failure;
And for what it's worth, the code above doesn't require __ip_vs_mutex, you
can defer the locking until here for concurrency improvement.
quoted text > +
> + switch (cmd) {
> + case IPVS_CMD_GET_SERVICE:
> + {
> + struct ip_vs_service *svc;
> +
> + svc = ip_vs_genl_find_service(info->attrs[IPVS_CMD_ATTR_SERVICE]);
> + if (IS_ERR(svc)) {
> + ret = PTR_ERR(svc);
> + goto out_err;
> + } else if (svc) {
> + ret = ip_vs_genl_fill_service(msg, svc);
> + ip_vs_service_put(svc);
> + if (ret)
> + goto nla_put_failure;
> + } else {
> + ret = -ESRCH;
> + goto out_err;
> + }
> +
> + break;
> + }
> +
> + case IPVS_CMD_GET_CONFIG:
> + {
> + struct ip_vs_timeout_user t;
> +
> + __ip_vs_get_timeouts(&t);
> +#ifdef CONFIG_IP_VS_PROTO_TCP
> + NLA_PUT_U32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP, t.tcp_timeout);
> + NLA_PUT_U32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
> + t.tcp_fin_timeout);
> +#endif
> +#ifdef CONFIG_IP_VS_PROTO_UDP
> + NLA_PUT_U32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout);
> +#endif
> +
> + break;
> + }
> +
> + case IPVS_CMD_GET_INFO:
> + NLA_PUT_U32(msg, IPVS_INFO_ATTR_VERSION, IP_VS_VERSION_CODE);
> + NLA_PUT_U32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
> + IP_VS_CONN_TAB_SIZE);
> + break;
> + }
> +
> + genlmsg_end(msg, reply);
> + ret = genlmsg_unicast(msg, info->snd_pid);
> + goto out;
> +
> +nla_put_failure:
> + IP_VS_ERR("not enough space in Netlink message\n");
> + ret = -EMSGSIZE;
> +
> +out_err:
> + if (msg)
> + nlmsg_free(msg);
> +out:
> + mutex_unlock(&__ip_vs_mutex);
> +
> + return ret;
> +}
> +
> +
> +static struct genl_ops ip_vs_genl_ops[] __read_mostly = {
> + /* SET commands */
> + {
> + .cmd = IPVS_CMD_NEW_SERVICE,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_SET_SERVICE,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_DEL_SERVICE,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_GET_SERVICE,
> + .flags = GENL_ADMIN_PERM,
> + .doit = ip_vs_genl_get_cmd,
> + .dumpit = ip_vs_genl_dump_services,
> + .policy = ip_vs_cmd_policy,
> + },
> + {
> + .cmd = IPVS_CMD_NEW_DEST,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_SET_DEST,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_DEL_DEST,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_GET_DEST,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .dumpit = ip_vs_genl_dump_dests,
> + },
> + {
> + .cmd = IPVS_CMD_NEW_DAEMON,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_DEL_DAEMON,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_GET_DAEMON,
> + .flags = GENL_ADMIN_PERM,
> + .dumpit = ip_vs_genl_dump_daemons,
> + },
> + {
> + .cmd = IPVS_CMD_SET_CONFIG,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_GET_CONFIG,
> + .flags = GENL_ADMIN_PERM,
> + .doit = ip_vs_genl_get_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_GET_INFO,
> + .flags = GENL_ADMIN_PERM,
> + .doit = ip_vs_genl_get_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_ZERO,
> + .flags = GENL_ADMIN_PERM,
> + .policy = ip_vs_cmd_policy,
> + .doit = ip_vs_genl_set_cmd,
> + },
> + {
> + .cmd = IPVS_CMD_FLUSH,
> + .flags = GENL_ADMIN_PERM,
> + .doit = ip_vs_genl_set_cmd,
> + },
> +};
> +
> +int ip_vs_genl_register(void)
> +{
> + int ret, i;
> +
> + ret = genl_register_family(&ip_vs_genl_family);
> + if (ret)
> + return ret;
> +
> + for (i = 0; i < ARRAY_SIZE(ip_vs_genl_ops); i++) {
> + ret = genl_register_ops(&ip_vs_genl_family, &ip_vs_genl_ops[i]);
> + if (ret)
> + goto err_out;
> + }
> + return 0;
> +
> +err_out:
> + genl_unregister_family(&ip_vs_genl_family);
> + return ret;
> +}
> +
> +void ip_vs_genl_unregister(void)
> +{
> + genl_unregister_family(&ip_vs_genl_family);
> +}
> +
> +/* End of Generic Netlink interface definitions */
> +
>
> int ip_vs_control_init(void)
> {
> @@ -2319,6 +3191,13 @@ int ip_vs_control_init(void)
> return ret;
> }
>
> + ret = ip_vs_genl_register();
> + if (ret) {
> + IP_VS_ERR("cannot register Generic Netlink interface.\n");
> + nf_unregister_sockopt(&ip_vs_sockopts);
> + return ret;
> + }
> +
> proc_net_fops_create(&init_net, "ip_vs", 0, &ip_vs_info_fops);
> proc_net_fops_create(&init_net, "ip_vs_stats",0, &ip_vs_stats_fops);
>
> @@ -2355,6 +3234,7 @@ void ip_vs_control_cleanup(void)
> unregister_sysctl_table(sysctl_header);
> proc_net_remove(&init_net, "ip_vs_stats");
> proc_net_remove(&init_net, "ip_vs");
> + ip_vs_genl_unregister();
> nf_unregister_sockopt(&ip_vs_sockopts);
> LeaveFunction(2);
> }
>
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