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[73.202.182.113]) by smtp.gmail.com with ESMTPSA id z13sm11884601pjz.15.2019.12.26.14.52.19 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 26 Dec 2019 14:52:20 -0800 (PST) From: Tom Herbert To: davem@davemloft.net, netdev@vger.kernel.org, simon.horman@netronome.com, willemdebruijn.kernel@gmail.com Cc: Tom Herbert , Tom Herbert Subject: [PATCH v8 net-next 8/9] ip6tlvs: Add netlink interface Date: Thu, 26 Dec 2019 14:51:37 -0800 Message-Id: <1577400698-4836-9-git-send-email-tom@herbertland.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1577400698-4836-1-git-send-email-tom@herbertland.com> References: <1577400698-4836-1-git-send-email-tom@herbertland.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Tom Herbert Add a netlink interface to manage the TX TLV parameters. Managed parameters include those for validating and sending TLVs being sent such as alignment, TLV ordering, length limits, etc. Signed-off-by: Tom Herbert --- include/net/ipeh.h | 16 +++ include/net/ipv6.h | 1 + include/uapi/linux/in6.h | 6 + include/uapi/linux/ipeh.h | 29 +++++ net/ipv6/exthdrs_common.c | 279 +++++++++++++++++++++++++++++++++++++++++++++ net/ipv6/exthdrs_options.c | 81 ++++++++++++- 6 files changed, 410 insertions(+), 2 deletions(-) diff --git a/include/net/ipeh.h b/include/net/ipeh.h index 6f46e2c..7ddbda1 100644 --- a/include/net/ipeh.h +++ b/include/net/ipeh.h @@ -3,6 +3,7 @@ #define _NET_IPEH_H #include +#include /* * Parsing tlv encoded headers. @@ -106,6 +107,21 @@ static inline int ipeh_tlv_unset_proc(struct tlv_param_table *tlv_param_table, return __ipeh_tlv_unset(tlv_param_table, type, false); } +extern const struct nla_policy ipeh_tlv_nl_policy[]; + +int ipeh_tlv_nl_cmd_set(struct tlv_param_table *tlv_param_table, + struct genl_family *tlv_nl_family, + struct sk_buff *skb, struct genl_info *info); +int ipeh_tlv_nl_cmd_unset(struct tlv_param_table *tlv_param_table, + struct genl_family *tlv_nl_family, + struct sk_buff *skb, struct genl_info *info); +int ipeh_tlv_nl_cmd_get(struct tlv_param_table *tlv_param_table, + struct genl_family *tlv_nl_family, + struct sk_buff *skb, struct genl_info *info); +int ipeh_tlv_nl_dump(struct tlv_param_table *tlv_param_table, + struct genl_family *tlv_nl_family, + struct sk_buff *skb, struct netlink_callback *cb); + /* ipeh_tlv_get_proc_by_type assumes rcu_read_lock is held */ static inline struct tlv_proc *ipeh_tlv_get_proc_by_type( struct tlv_param_table *tlv_param_table, unsigned char type) diff --git a/include/net/ipv6.h b/include/net/ipv6.h index e290e90..68b7fb8 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include diff --git a/include/uapi/linux/in6.h b/include/uapi/linux/in6.h index 9f2273a..d5fe3d9 100644 --- a/include/uapi/linux/in6.h +++ b/include/uapi/linux/in6.h @@ -297,4 +297,10 @@ struct in6_flowlabel_req { * ... * MRT6_MAX */ + + /* NETLINK_GENERIC related info for IPv6 TLVs */ + +#define IPV6_TLV_GENL_NAME "ipv6-tlv" +#define IPV6_TLV_GENL_VERSION 0x1 + #endif /* _UAPI_LINUX_IN6_H */ diff --git a/include/uapi/linux/ipeh.h b/include/uapi/linux/ipeh.h index dbf0728..fb1d6e5 100644 --- a/include/uapi/linux/ipeh.h +++ b/include/uapi/linux/ipeh.h @@ -21,4 +21,33 @@ enum { IPEH_TLV_PERM_MAX = IPEH_TLV_PERM_NO_CHECK }; +/* NETLINK_GENERIC related info for IP TLVs */ + +enum { + IPEH_TLV_ATTR_UNSPEC, + IPEH_TLV_ATTR_TYPE, /* u8, > 1 */ + IPEH_TLV_ATTR_ORDER, /* u16 */ + IPEH_TLV_ATTR_ADMIN_PERM, /* u8, perm value (0 to 2) */ + IPEH_TLV_ATTR_USER_PERM, /* u8, perm value (0 to 2) */ + IPEH_TLV_ATTR_CLASS, /* u8, 3 bit flags */ + IPEH_TLV_ATTR_ALIGN_MULT, /* u8, 1 to 16 */ + IPEH_TLV_ATTR_ALIGN_OFF, /* u8, 0 to 15 */ + IPEH_TLV_ATTR_MIN_DATA_LEN, /* u8 (option data length) */ + IPEH_TLV_ATTR_MAX_DATA_LEN, /* u8 (option data length) */ + IPEH_TLV_ATTR_DATA_LEN_MULT, /* u8, 1 to 16 */ + IPEH_TLV_ATTR_DATA_LEN_OFF, /* u8, 0 to 15 */ + + __IPEH_TLV_ATTR_MAX, +}; + +#define IPEH_TLV_ATTR_MAX (__IPEH_TLV_ATTR_MAX - 1) + +enum { + IPEH_TLV_CMD_SET, + IPEH_TLV_CMD_UNSET, + IPEH_TLV_CMD_GET, + + __IPEH_TLV_CMD_MAX, +}; + #endif /* _UAPI_LINUX_IPEH_H */ diff --git a/net/ipv6/exthdrs_common.c b/net/ipv6/exthdrs_common.c index e9309ea..794f3ae 100644 --- a/net/ipv6/exthdrs_common.c +++ b/net/ipv6/exthdrs_common.c @@ -457,6 +457,285 @@ int __ipeh_tlv_unset(struct tlv_param_table *tlv_param_table, } EXPORT_SYMBOL(__ipeh_tlv_unset); +const struct nla_policy ipeh_tlv_nl_policy[IPEH_TLV_ATTR_MAX + 1] = { + [IPEH_TLV_ATTR_TYPE] = { .type = NLA_U8, }, + [IPEH_TLV_ATTR_ORDER] = { .type = NLA_U16, }, + [IPEH_TLV_ATTR_ADMIN_PERM] = { .type = NLA_U8, }, + [IPEH_TLV_ATTR_USER_PERM] = { .type = NLA_U8, }, + [IPEH_TLV_ATTR_CLASS] = { .type = NLA_U8, }, + [IPEH_TLV_ATTR_ALIGN_MULT] = { .type = NLA_U8, }, + [IPEH_TLV_ATTR_ALIGN_OFF] = { .type = NLA_U8, }, + [IPEH_TLV_ATTR_MIN_DATA_LEN] = { .type = NLA_U8, }, + [IPEH_TLV_ATTR_MAX_DATA_LEN] = { .type = NLA_U8, }, + [IPEH_TLV_ATTR_DATA_LEN_OFF] = { .type = NLA_U8, }, + [IPEH_TLV_ATTR_DATA_LEN_MULT] = { .type = NLA_U8, }, +}; +EXPORT_SYMBOL(ipeh_tlv_nl_policy); + +int ipeh_tlv_nl_cmd_set(struct tlv_param_table *tlv_param_table, + struct genl_family *tlv_nl_family, + struct sk_buff *skb, struct genl_info *info) +{ + struct tlv_params new_params; + struct tlv_proc *tproc; + unsigned char type; + int retv = -EINVAL; + unsigned int v; + + if (!info->attrs[IPEH_TLV_ATTR_TYPE]) { + NL_SET_ERR_MSG(info->extack, "No TLV type"); + return -EINVAL; + } + + type = nla_get_u8(info->attrs[IPEH_TLV_ATTR_TYPE]); + if (type < 2) { + NL_SET_ERR_MSG(info->extack, + "Invalid TLV type (less than 2)"); + return -EINVAL; + } + + rcu_read_lock(); + + /* Base new parameters on existing ones */ + tproc = ipeh_tlv_get_proc_by_type(tlv_param_table, type); + new_params = tproc->params; + + if (info->attrs[IPEH_TLV_ATTR_ORDER]) { + v = nla_get_u16(info->attrs[IPEH_TLV_ATTR_ORDER]); + new_params.t.preferred_order = v; + } + + if (info->attrs[IPEH_TLV_ATTR_ADMIN_PERM]) { + v = nla_get_u8(info->attrs[IPEH_TLV_ATTR_ADMIN_PERM]); + if (v > IPEH_TLV_PERM_MAX) { + NL_SET_ERR_MSG(info->extack, + "Bad admin perm value"); + goto out; + } + new_params.t.admin_perm = v; + } + + if (info->attrs[IPEH_TLV_ATTR_USER_PERM]) { + v = nla_get_u8(info->attrs[IPEH_TLV_ATTR_USER_PERM]); + if (v > IPEH_TLV_PERM_MAX) { + NL_SET_ERR_MSG(info->extack, + "Bad user perm value"); + goto out; + } + new_params.t.user_perm = v; + } + + if (info->attrs[IPEH_TLV_ATTR_CLASS]) { + v = nla_get_u8(info->attrs[IPEH_TLV_ATTR_CLASS]); + if (!v || (v & ~IPEH_TLV_CLASS_FLAG_MASK)) { + NL_SET_ERR_MSG(info->extack, "Bad TLV class"); + goto out; + } + new_params.t.class = v; + } + + if (info->attrs[IPEH_TLV_ATTR_ALIGN_MULT]) { + v = nla_get_u8(info->attrs[IPEH_TLV_ATTR_ALIGN_MULT]); + if (v > 16 || v < 1) { + NL_SET_ERR_MSG(info->extack, + "Alignment must be < 16 and > 0"); + goto out; + } + new_params.t.align_mult = v - 1; + } + + if (info->attrs[IPEH_TLV_ATTR_ALIGN_OFF]) { + v = nla_get_u8(info->attrs[IPEH_TLV_ATTR_ALIGN_OFF]); + if (v > 15) { + NL_SET_ERR_MSG(info->extack, + "Alignment offset must be < 16"); + goto out; + } + new_params.t.align_off = v; + } + + if (info->attrs[IPEH_TLV_ATTR_MAX_DATA_LEN]) + new_params.t.max_data_len = + nla_get_u8(info->attrs[IPEH_TLV_ATTR_MAX_DATA_LEN]); + + if (info->attrs[IPEH_TLV_ATTR_MIN_DATA_LEN]) + new_params.t.min_data_len = + nla_get_u8(info->attrs[IPEH_TLV_ATTR_MIN_DATA_LEN]); + + if (new_params.t.min_data_len > new_params.t.max_data_len) { + NL_SET_ERR_MSG(info->extack, + "Min data length must be less than or equal to max data length"); + goto out; + } + + if (info->attrs[IPEH_TLV_ATTR_DATA_LEN_MULT]) { + v = nla_get_u8(info->attrs[IPEH_TLV_ATTR_DATA_LEN_MULT]); + if (v > 16 || v < 1) { + NL_SET_ERR_MSG(info->extack, + "Length multiple must be < 16 and > 0"); + goto out; + } + new_params.t.data_len_mult = v - 1; + } + + if (info->attrs[IPEH_TLV_ATTR_DATA_LEN_OFF]) { + v = nla_get_u8(info->attrs[IPEH_TLV_ATTR_DATA_LEN_OFF]); + if (v > 15) { + NL_SET_ERR_MSG(info->extack, + "Data length offset must be < 16"); + goto out; + } + new_params.t.data_len_off = v; + } + + retv = ipeh_tlv_set_params(tlv_param_table, type, &new_params); + +out: + rcu_read_unlock(); + return retv; +} +EXPORT_SYMBOL(ipeh_tlv_nl_cmd_set); + +int ipeh_tlv_nl_cmd_unset(struct tlv_param_table *tlv_param_table, + struct genl_family *tlv_nl_family, + struct sk_buff *skb, struct genl_info *info) +{ + unsigned char type; + + if (!info->attrs[IPEH_TLV_ATTR_TYPE]) { + NL_SET_ERR_MSG(info->extack, "No TLV type"); + return -EINVAL; + } + + type = nla_get_u8(info->attrs[IPEH_TLV_ATTR_TYPE]); + if (type < 2) { + NL_SET_ERR_MSG(info->extack, + "Invalid TLV type (less than 2)"); + return -EINVAL; + } + + return ipeh_tlv_unset_params(tlv_param_table, type); +} +EXPORT_SYMBOL(ipeh_tlv_nl_cmd_unset); + +static int tlv_fill_info(struct tlv_proc *tproc, unsigned char type, + struct sk_buff *msg, bool admin) +{ + struct tlv_params *tp = &tproc->params; + int ret = 0; + + if (nla_put_u8(msg, IPEH_TLV_ATTR_TYPE, type) || + nla_put_u16(msg, IPEH_TLV_ATTR_ORDER, tp->t.preferred_order) || + nla_put_u8(msg, IPEH_TLV_ATTR_USER_PERM, tp->t.user_perm) || + (admin && nla_put_u8(msg, IPEH_TLV_ATTR_ADMIN_PERM, + tp->t.admin_perm)) || + nla_put_u8(msg, IPEH_TLV_ATTR_CLASS, tp->t.class) || + nla_put_u8(msg, IPEH_TLV_ATTR_ALIGN_MULT, tp->t.align_mult + 1) || + nla_put_u8(msg, IPEH_TLV_ATTR_ALIGN_OFF, tp->t.align_off) || + nla_put_u8(msg, IPEH_TLV_ATTR_MIN_DATA_LEN, tp->t.min_data_len) || + nla_put_u8(msg, IPEH_TLV_ATTR_MAX_DATA_LEN, tp->t.max_data_len) || + nla_put_u8(msg, IPEH_TLV_ATTR_DATA_LEN_MULT, + tp->t.data_len_mult + 1) || + nla_put_u8(msg, IPEH_TLV_ATTR_DATA_LEN_OFF, tp->t.data_len_off)) + ret = -1; + + return ret; +} + +static int tlv_dump_info(struct tlv_proc *tproc, unsigned char type, + struct genl_family *tlv_nl_family, u32 portid, + u32 seq, u32 flags, struct sk_buff *skb, u8 cmd, + bool admin) +{ + void *hdr; + + hdr = genlmsg_put(skb, portid, seq, tlv_nl_family, flags, cmd); + if (!hdr) + return -ENOMEM; + + if (tlv_fill_info(tproc, type, skb, admin) < 0) { + genlmsg_cancel(skb, hdr); + return -EMSGSIZE; + } + + genlmsg_end(skb, hdr); + + return 0; +} + +int ipeh_tlv_nl_cmd_get(struct tlv_param_table *tlv_param_table, + struct genl_family *tlv_nl_family, + struct sk_buff *skb, struct genl_info *info) +{ + struct tlv_proc *tproc; + struct sk_buff *msg; + unsigned char type; + int ret; + + if (!info->attrs[IPEH_TLV_ATTR_TYPE]) { + NL_SET_ERR_MSG(info->extack, "No TLV type"); + return -EINVAL; + } + + type = nla_get_u8(info->attrs[IPEH_TLV_ATTR_TYPE]); + if (type < 2) { + NL_SET_ERR_MSG(info->extack, + "Invalid TLV type (less than 2)"); + return -EINVAL; + } + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + rcu_read_lock(); + + tproc = ipeh_tlv_get_proc_by_type(tlv_param_table, type); + ret = tlv_dump_info(tproc, type, tlv_nl_family, info->snd_portid, + info->snd_seq, 0, msg, info->genlhdr->cmd, + netlink_capable(skb, CAP_NET_ADMIN)); + + rcu_read_unlock(); + + if (ret < 0) { + nlmsg_free(msg); + return ret; + } + + return genlmsg_reply(msg, info); +} +EXPORT_SYMBOL(ipeh_tlv_nl_cmd_get); + +int ipeh_tlv_nl_dump(struct tlv_param_table *tlv_param_table, + struct genl_family *tlv_nl_family, + struct sk_buff *skb, struct netlink_callback *cb) +{ + struct tlv_proc *tproc; + int idx = 0, ret, i; + + rcu_read_lock(); + + for (i = 2; i < 256; i++) { + if (idx++ < cb->args[0]) + continue; + + tproc = ipeh_tlv_get_proc_by_type(tlv_param_table, i); + ret = tlv_dump_info(tproc, i, tlv_nl_family, + NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, NLM_F_MULTI, + skb, IPEH_TLV_CMD_GET, + netlink_capable(cb->skb, CAP_NET_ADMIN)); + if (ret) + break; + } + + rcu_read_unlock(); + + cb->args[0] = idx; + return skb->len; +} +EXPORT_SYMBOL(ipeh_tlv_nl_dump); + int ipeh_exthdrs_init(struct tlv_param_table *tlv_param_table, const struct tlv_proc_init *tlv_init_params, int num_init_params) diff --git a/net/ipv6/exthdrs_options.c b/net/ipv6/exthdrs_options.c index 3b50b58..c1889f6 100644 --- a/net/ipv6/exthdrs_options.c +++ b/net/ipv6/exthdrs_options.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #if IS_ENABLED(CONFIG_IPV6_MIP6) @@ -253,13 +254,89 @@ static const struct tlv_proc_init tlv_ipv6_init_params[] __initconst = { struct tlv_param_table __rcu ipv6_tlv_param_table; EXPORT_SYMBOL(ipv6_tlv_param_table); +static int ipv6_tlv_nl_cmd_set(struct sk_buff *skb, struct genl_info *info); +static int ipv6_tlv_nl_cmd_unset(struct sk_buff *skb, struct genl_info *info); +static int ipv6_tlv_nl_cmd_get(struct sk_buff *skb, struct genl_info *info); +static int ipv6_tlv_nl_dump(struct sk_buff *skb, struct netlink_callback *cb); + +static const struct genl_ops ipv6_tlv_nl_ops[] = { +{ + .cmd = IPEH_TLV_CMD_SET, + .doit = ipv6_tlv_nl_cmd_set, + .flags = GENL_ADMIN_PERM, +}, +{ + .cmd = IPEH_TLV_CMD_UNSET, + .doit = ipv6_tlv_nl_cmd_unset, + .flags = GENL_ADMIN_PERM, +}, +{ + .cmd = IPEH_TLV_CMD_GET, + .doit = ipv6_tlv_nl_cmd_get, + .dumpit = ipv6_tlv_nl_dump, +}, +}; + +struct genl_family ipv6_tlv_nl_family __ro_after_init = { + .hdrsize = 0, + .name = IPV6_TLV_GENL_NAME, + .version = IPV6_TLV_GENL_VERSION, + .maxattr = IPEH_TLV_ATTR_MAX, + .policy = ipeh_tlv_nl_policy, + .netnsok = true, + .parallel_ops = true, + .ops = ipv6_tlv_nl_ops, + .n_ops = ARRAY_SIZE(ipv6_tlv_nl_ops), + .module = THIS_MODULE, +}; + +static int ipv6_tlv_nl_cmd_set(struct sk_buff *skb, struct genl_info *info) +{ + return ipeh_tlv_nl_cmd_set(&ipv6_tlv_param_table, &ipv6_tlv_nl_family, + skb, info); +} + +static int ipv6_tlv_nl_cmd_unset(struct sk_buff *skb, struct genl_info *info) +{ + return ipeh_tlv_nl_cmd_unset(&ipv6_tlv_param_table, &ipv6_tlv_nl_family, + skb, info); +} + +static int ipv6_tlv_nl_cmd_get(struct sk_buff *skb, struct genl_info *info) +{ + return ipeh_tlv_nl_cmd_get(&ipv6_tlv_param_table, &ipv6_tlv_nl_family, + skb, info); +} + +static int ipv6_tlv_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) +{ + return ipeh_tlv_nl_dump(&ipv6_tlv_param_table, &ipv6_tlv_nl_family, + skb, cb); +} + int __init ipv6_exthdrs_options_init(void) { - return ipeh_exthdrs_init(&ipv6_tlv_param_table, tlv_ipv6_init_params, - ARRAY_SIZE(tlv_ipv6_init_params)); + int err; + + err = genl_register_family(&ipv6_tlv_nl_family); + if (err) + goto genl_fail; + + ipeh_exthdrs_init(&ipv6_tlv_param_table, tlv_ipv6_init_params, + ARRAY_SIZE(tlv_ipv6_init_params)); + if (err) + goto ipv6_fail; + + return 0; + +ipv6_fail: + genl_unregister_family(&ipv6_tlv_nl_family); +genl_fail: + return err; } void ipv6_exthdrs_options_exit(void) { ipeh_exthdrs_fini(&ipv6_tlv_param_table); + genl_unregister_family(&ipv6_tlv_nl_family); }