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netlink: return optional metadata with the operation result.
Some operations like interface creation may need to return metadata - in this case, interface name - back to the caller if the operation is successful. This change implements attaching an `NLMSGERR_ATTR_COOKIE` nla to the operation reply message via `nlmsg_report_cookie()`. Additionally, on successful interface creation, interface index and interface name are returned in the `IFLA_NEW_IFINDEX` and `IFLA_IFNAME TLVs, encapsulated in the `NLMSGERR_ATTR_COOKIE`. Reviewed By: pauamma Differential Revision: https://reviews.freebsd.org/D38283 MFC after: 1 week
This commit is contained in:
parent
08b0c98006
commit
25c2dd2f2c
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@ -217,6 +217,10 @@ socket option is set, the kernel may add a
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string TLV with the textual error description, optionally followed by the
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.Dv NLMSGERR_ATTR_OFFS
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TLV, indicating the offset from the message start that triggered an error.
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Some operations may return additional metadata encapsulated in the
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.Dv NLMSGERR_ATTR_COOKIE
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TLV.
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The metadata format is specific to the operation.
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If the operation reply is a multipart message, then no
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.Dv NLMSG_ERROR
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reply is generated, only a
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@ -284,6 +284,13 @@ struct ifinfomsg {
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Creates a new interface.
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The only mandatory TLV is
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.Dv IFLA_IFNAME .
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The following attributes are returned inside the nested
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.Dv NLMSGERR_ATTR_COOKIE :
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.Pp
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.Bd -literal -offset indent -compact
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IFLA_NEW_IFINDEX (uint32) created interface index
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IFLA_IFNAME (string) created interface name
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.Ed
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.Ss RTM_DELLINK
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Deletes the interface specified by
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.Dv IFLA_IFNAME .
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@ -78,6 +78,25 @@ nlmsg_report_err_offset(struct nl_pstate *npt, uint32_t off)
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return (true);
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}
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void
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nlmsg_report_cookie(struct nl_pstate *npt, struct nlattr *nla)
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{
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MPASS(nla->nla_type == NLMSGERR_ATTR_COOKIE);
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MPASS(nla->nla_len >= sizeof(struct nlattr));
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npt->cookie = nla;
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}
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void
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nlmsg_report_cookie_u32(struct nl_pstate *npt, uint32_t val)
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{
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struct nlattr *nla = npt_alloc(npt, sizeof(*nla) + sizeof(uint32_t));
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nla->nla_type = NLMSGERR_ATTR_COOKIE;
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nla->nla_len = sizeof(*nla) + sizeof(uint32_t);
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memcpy(nla + 1, &val, sizeof(uint32_t));
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nlmsg_report_cookie(npt, nla);
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}
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static const struct nlattr_parser *
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search_states(const struct nlattr_parser *ps, int pslen, int key)
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{
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@ -71,6 +71,7 @@ struct nl_pstate {
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uint32_t err_off; /* error offset from hdr start */
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int error; /* last operation error */
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char *err_msg; /* Description of last error */
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struct nlattr *cookie; /* NLA to return to the userspace */
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bool strict; /* Strict parsing required */
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};
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@ -198,6 +199,9 @@ bool nlmsg_report_err_msg(struct nl_pstate *npt, const char *fmt, ...);
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bool nlmsg_report_err_offset(struct nl_pstate *npt, uint32_t off);
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void nlmsg_report_cookie(struct nl_pstate *npt, struct nlattr *nla);
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void nlmsg_report_cookie_u32(struct nl_pstate *npt, uint32_t val);
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/*
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* Have it inline so compiler can optimize field accesses into
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* the list of direct function calls without iteration.
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@ -643,10 +643,6 @@ nlmsg_ack(struct nlpcb *nlp, int error, struct nlmsghdr *hdr,
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if ((npt->err_msg || npt->err_off) && nlp->nl_flags & NLF_EXT_ACK)
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nl_flags |= NLM_F_ACK_TLVS;
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/*
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* TODO: handle cookies
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*/
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NL_LOG(LOG_DEBUG3, "acknowledging message type %d seq %d",
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hdr->nlmsg_type, hdr->nlmsg_seq);
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@ -662,6 +658,8 @@ nlmsg_ack(struct nlpcb *nlp, int error, struct nlmsghdr *hdr,
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nlattr_add_string(nw, NLMSGERR_ATTR_MSG, npt->err_msg);
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if (npt->err_off != 0 && nlp->nl_flags & NLF_EXT_ACK)
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nlattr_add_u32(nw, NLMSGERR_ATTR_OFFS, npt->err_off);
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if (npt->cookie != NULL)
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nlattr_add_raw(nw, npt->cookie);
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if (nlmsg_end(nw))
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return;
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@ -163,6 +163,27 @@ _nlmsg_reserve_attr(struct nl_writer *nw, uint16_t nla_type, uint16_t sz)
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}
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#define nlmsg_reserve_attr(_ns, _at, _t) ((_t *)_nlmsg_reserve_attr(_ns, _at, NLA_ALIGN(sizeof(_t))))
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static inline bool
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nlattr_add_nla(struct nl_writer *nw, const struct nlattr *nla_src)
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{
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MPASS(nla_src->nla_len >= sizeof(struct nlattr));
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int required_len = NLA_ALIGN(nla_src->nla_len);
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if (__predict_false(nw->offset + required_len > nw->alloc_len)) {
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if (!nlmsg_refill_buffer(nw, required_len))
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return (false);
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}
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struct nlattr *nla = (struct nlattr *)(&nw->data[nw->offset]);
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if ((nla_src->nla_len % 4) != 0) {
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/* clear padding bytes */
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bzero((char *)nla + nla_src->nla_len - 4, 4);
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}
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memcpy(nla, nla_src, nla_src->nla_len);
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nw->offset += required_len;
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return (true);
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}
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static inline bool
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nlattr_add(struct nl_writer *nw, int attr_type, int attr_len, const void *data)
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{
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@ -188,6 +209,16 @@ nlattr_add(struct nl_writer *nw, int attr_type, int attr_len, const void *data)
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return (true);
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}
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static inline bool
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nlattr_add_raw(struct nl_writer *nw, const struct nlattr *nla_src)
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{
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int attr_len = nla_src->nla_len - sizeof(struct nlattr);
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MPASS(attr_len >= 0);
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return (nlattr_add(nw, nla_src->nla_type, attr_len, (const void *)(nla_src + 1)));
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}
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static inline bool
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nlattr_add_u8(struct nl_writer *nw, int attrtype, uint8_t value)
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{
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@ -109,6 +109,41 @@ modify_generic(struct ifnet *ifp, struct nl_parsed_link *lattrs,
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return (0);
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}
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/*
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* Saves the resulting ifindex and ifname to report them
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* to userland along with the operation result.
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* NLA format:
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* NLMSGERR_ATTR_COOKIE(nested)
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* IFLA_NEW_IFINDEX(u32)
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* IFLA_IFNAME(string)
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*/
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static void
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store_cookie(struct nl_pstate *npt, struct ifnet *ifp)
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{
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int ifname_len = strlen(if_name(ifp));
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uint32_t ifindex = (uint32_t)ifp->if_index;
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int nla_len = sizeof(struct nlattr) * 3 +
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sizeof(ifindex) + NL_ITEM_ALIGN(ifname_len + 1);
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struct nlattr *nla_cookie = npt_alloc(npt, nla_len);
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/* Nested TLV */
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nla_cookie->nla_len = nla_len;
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nla_cookie->nla_type = NLMSGERR_ATTR_COOKIE;
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struct nlattr *nla = nla_cookie + 1;
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nla->nla_len = sizeof(struct nlattr) + sizeof(ifindex);
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nla->nla_type = IFLA_NEW_IFINDEX;
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memcpy(NLA_DATA(nla), &ifindex, sizeof(ifindex));
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nla = NLA_NEXT(nla);
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nla->nla_len = sizeof(struct nlattr) + ifname_len + 1;
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nla->nla_type = IFLA_IFNAME;
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strlcpy(NLA_DATA(nla), if_name(ifp), ifname_len + 1);
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nlmsg_report_cookie(npt, nla_cookie);
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}
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/*
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* Generic creation interface handler.
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* Responsible for creating interfaces w/o parameters and setting
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@ -135,6 +170,8 @@ create_generic(struct nl_parsed_link *lattrs, const struct nlattr_bmask *bm,
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if (!success)
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return (EINVAL);
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error = modify_generic(ifp, lattrs, bm, nlp, npt);
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if (error == 0)
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store_cookie(npt, ifp);
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if_rele(ifp);
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}
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@ -950,58 +950,68 @@ def prepare_attrs_map(attrs: List[AttrDescr]) -> Dict[str, Dict]:
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return ret
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rtnl_route_attrs = [
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AttrDescr(RtattrType.RTA_DST, NlAttrIp),
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AttrDescr(RtattrType.RTA_SRC, NlAttrIp),
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AttrDescr(RtattrType.RTA_IIF, NlAttrIfindex),
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AttrDescr(RtattrType.RTA_OIF, NlAttrIfindex),
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AttrDescr(RtattrType.RTA_GATEWAY, NlAttrTable),
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AttrDescr(RtattrType.RTA_VIA, NlAttrVia),
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AttrDescr(RtattrType.RTA_NH_ID, NlAttrNhId),
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AttrDescr(
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RtattrType.RTA_METRICS,
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NlAttrNested,
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[
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AttrDescr(NlRtaxType.RTAX_MTU, NlAttrU32),
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],
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),
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]
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rtnl_route_attrs = prepare_attrs_map(
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[
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AttrDescr(RtattrType.RTA_DST, NlAttrIp),
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AttrDescr(RtattrType.RTA_SRC, NlAttrIp),
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AttrDescr(RtattrType.RTA_IIF, NlAttrIfindex),
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AttrDescr(RtattrType.RTA_OIF, NlAttrIfindex),
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AttrDescr(RtattrType.RTA_GATEWAY, NlAttrTable),
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AttrDescr(RtattrType.RTA_VIA, NlAttrVia),
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AttrDescr(RtattrType.RTA_NH_ID, NlAttrNhId),
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AttrDescr(
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RtattrType.RTA_METRICS,
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NlAttrNested,
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[
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AttrDescr(NlRtaxType.RTAX_MTU, NlAttrU32),
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],
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),
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]
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)
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nldone_attrs = []
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nldone_attrs = prepare_attrs_map([])
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nlerr_attrs = [
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AttrDescr(NlErrattrType.NLMSGERR_ATTR_MSG, NlAttrStr),
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AttrDescr(NlErrattrType.NLMSGERR_ATTR_OFFS, NlAttrU32),
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]
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nlerr_attrs = prepare_attrs_map(
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[
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AttrDescr(NlErrattrType.NLMSGERR_ATTR_MSG, NlAttrStr),
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AttrDescr(NlErrattrType.NLMSGERR_ATTR_OFFS, NlAttrU32),
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AttrDescr(NlErrattrType.NLMSGERR_ATTR_COOKIE, NlAttr),
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]
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)
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rtnl_ifla_attrs = [
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AttrDescr(IflattrType.IFLA_ADDRESS, NlAttrMac),
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AttrDescr(IflattrType.IFLA_BROADCAST, NlAttrMac),
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AttrDescr(IflattrType.IFLA_IFNAME, NlAttrStr),
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AttrDescr(IflattrType.IFLA_MTU, NlAttrU32),
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AttrDescr(IflattrType.IFLA_PROMISCUITY, NlAttrU32),
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AttrDescr(IflattrType.IFLA_OPERSTATE, NlAttrU8),
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AttrDescr(IflattrType.IFLA_CARRIER, NlAttrU8),
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AttrDescr(IflattrType.IFLA_IFALIAS, NlAttrStr),
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AttrDescr(IflattrType.IFLA_STATS64, NlAttrIfStats),
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AttrDescr(
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IflattrType.IFLA_LINKINFO,
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NlAttrNested,
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[
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AttrDescr(IflinkInfo.IFLA_INFO_KIND, NlAttrStr),
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AttrDescr(IflinkInfo.IFLA_INFO_DATA, NlAttr),
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],
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),
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]
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rtnl_ifla_attrs = prepare_attrs_map(
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[
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AttrDescr(IflattrType.IFLA_ADDRESS, NlAttrMac),
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AttrDescr(IflattrType.IFLA_BROADCAST, NlAttrMac),
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AttrDescr(IflattrType.IFLA_IFNAME, NlAttrStr),
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AttrDescr(IflattrType.IFLA_MTU, NlAttrU32),
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AttrDescr(IflattrType.IFLA_PROMISCUITY, NlAttrU32),
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AttrDescr(IflattrType.IFLA_OPERSTATE, NlAttrU8),
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AttrDescr(IflattrType.IFLA_CARRIER, NlAttrU8),
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AttrDescr(IflattrType.IFLA_IFALIAS, NlAttrStr),
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AttrDescr(IflattrType.IFLA_STATS64, NlAttrIfStats),
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AttrDescr(IflattrType.IFLA_NEW_IFINDEX, NlAttrU32),
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AttrDescr(
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IflattrType.IFLA_LINKINFO,
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NlAttrNested,
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[
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AttrDescr(IflinkInfo.IFLA_INFO_KIND, NlAttrStr),
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AttrDescr(IflinkInfo.IFLA_INFO_DATA, NlAttr),
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],
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),
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]
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)
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rtnl_ifa_attrs = [
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AttrDescr(IfattrType.IFA_ADDRESS, NlAttrIp),
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AttrDescr(IfattrType.IFA_LOCAL, NlAttrIp),
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AttrDescr(IfattrType.IFA_LABEL, NlAttrStr),
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AttrDescr(IfattrType.IFA_BROADCAST, NlAttrIp),
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AttrDescr(IfattrType.IFA_ANYCAST, NlAttrIp),
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AttrDescr(IfattrType.IFA_FLAGS, NlAttrU32),
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]
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rtnl_ifa_attrs = prepare_attrs_map(
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[
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AttrDescr(IfattrType.IFA_ADDRESS, NlAttrIp),
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AttrDescr(IfattrType.IFA_LOCAL, NlAttrIp),
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AttrDescr(IfattrType.IFA_LABEL, NlAttrStr),
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AttrDescr(IfattrType.IFA_BROADCAST, NlAttrIp),
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AttrDescr(IfattrType.IFA_ANYCAST, NlAttrIp),
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AttrDescr(IfattrType.IFA_FLAGS, NlAttrU32),
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]
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)
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class BaseNetlinkMessage(object):
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@ -1140,7 +1150,7 @@ def from_bytes(cls, helper, data):
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raise
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return self
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def _parse_attrs(self, data: bytes, attr_map):
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def parse_attrs(self, data: bytes, attr_map):
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ret = []
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off = 0
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while len(data) - off >= 4:
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@ -1157,7 +1167,7 @@ def _parse_attrs(self, data: bytes, attr_map):
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val = v["ad"].cls.from_bytes(data[off : off + nla_len], v["ad"].val)
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if "child" in v:
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# nested
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attrs, _ = self._parse_attrs(data[off : off + nla_len], v["child"])
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attrs, _ = self.parse_attrs(data[off : off + nla_len], v["child"])
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val = NlAttrNested(raw_nla_type, attrs)
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else:
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# unknown attribute
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@ -1167,7 +1177,7 @@ def _parse_attrs(self, data: bytes, attr_map):
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return ret, off
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def parse_nla_list(self, data: bytes) -> List[NlAttr]:
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return self._parse_attrs(data, self.nl_attrs_map)
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return self.parse_attrs(data, self.nl_attrs_map)
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def print_message(self):
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self.print_nl_header(self.nl_hdr)
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@ -1178,7 +1188,7 @@ def print_message(self):
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class NetlinkDoneMessage(StdNetlinkMessage):
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messages = [NlMsgType.NLMSG_DONE.value]
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nl_attrs_map = prepare_attrs_map(nldone_attrs)
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nl_attrs_map = nldone_attrs
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@property
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def error_code(self):
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@ -1197,7 +1207,7 @@ def print_base_header(self, hdr, prepend=""):
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class NetlinkErrorMessage(StdNetlinkMessage):
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messages = [NlMsgType.NLMSG_ERROR.value]
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nl_attrs_map = prepare_attrs_map(nlerr_attrs)
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nl_attrs_map = nlerr_attrs
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@property
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def error_code(self):
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@ -1217,6 +1227,10 @@ def error_offset(self):
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return nla.u32
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return None
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@property
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def cookie(self):
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return self.get_nla(NlErrattrType.NLMSGERR_ATTR_COOKIE)
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def parse_base_header(self, data):
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if len(data) < sizeof(Nlmsgerr):
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raise ValueError("length less than nlmsgerr header")
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@ -1257,7 +1271,7 @@ class NetlinkRtMessage(BaseNetlinkRtMessage):
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NlRtMsgType.RTM_DELROUTE.value,
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NlRtMsgType.RTM_GETROUTE.value,
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]
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nl_attrs_map = prepare_attrs_map(rtnl_route_attrs)
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nl_attrs_map = rtnl_route_attrs
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def __init__(self, helper, nlm_type):
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super().__init__(helper, nlm_type)
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@ -1297,7 +1311,7 @@ class NetlinkIflaMessage(BaseNetlinkRtMessage):
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NlRtMsgType.RTM_DELLINK.value,
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NlRtMsgType.RTM_GETLINK.value,
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]
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nl_attrs_map = prepare_attrs_map(rtnl_ifla_attrs)
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nl_attrs_map = rtnl_ifla_attrs
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def __init__(self, helper, nlm_type):
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super().__init__(helper, nlm_type)
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@ -1329,7 +1343,7 @@ class NetlinkIfaMessage(BaseNetlinkRtMessage):
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NlRtMsgType.RTM_DELADDR.value,
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NlRtMsgType.RTM_GETADDR.value,
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]
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nl_attrs_map = prepare_attrs_map(rtnl_ifa_attrs)
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nl_attrs_map = rtnl_ifa_attrs
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def __init__(self, helper, nlm_type):
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super().__init__(helper, nlm_type)
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@ -17,6 +17,7 @@
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from atf_python.sys.net.netlink import NlmNewFlags
|
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from atf_python.sys.net.netlink import NlMsgType
|
||||
from atf_python.sys.net.netlink import NlRtMsgType
|
||||
from atf_python.sys.net.netlink import rtnl_ifla_attrs
|
||||
from atf_python.sys.net.vnet import SingleVnetTestTemplate
|
||||
|
||||
|
||||
|
@ -91,6 +92,40 @@ def test_create_iface_plain(self):
|
|||
|
||||
self.get_interface_byname("lo10")
|
||||
|
||||
@pytest.mark.require_user("root")
|
||||
def test_create_iface_plain_retvals(self):
|
||||
"""Tests loopback creation w/o any parameters"""
|
||||
flags = NlmNewFlags.NLM_F_EXCL.value | NlmNewFlags.NLM_F_CREATE.value
|
||||
msg = NetlinkIflaMessage(self.helper, NlRtMsgType.RTM_NEWLINK.value)
|
||||
msg.nl_hdr.nlmsg_flags = (
|
||||
flags | NlmBaseFlags.NLM_F_ACK.value | NlmBaseFlags.NLM_F_REQUEST.value
|
||||
)
|
||||
msg.add_nla(NlAttrStr(IflattrType.IFLA_IFNAME, "lo10"))
|
||||
msg.add_nla(
|
||||
NlAttrNested(
|
||||
IflattrType.IFLA_LINKINFO,
|
||||
[
|
||||
NlAttrStrn(IflinkInfo.IFLA_INFO_KIND, "lo"),
|
||||
],
|
||||
)
|
||||
)
|
||||
|
||||
rx_msg = self.get_reply(msg)
|
||||
assert rx_msg.is_type(NlMsgType.NLMSG_ERROR)
|
||||
assert rx_msg.error_code == 0
|
||||
assert rx_msg.cookie is not None
|
||||
nla_list, _ = rx_msg.parse_attrs(bytes(rx_msg.cookie)[4:], rtnl_ifla_attrs)
|
||||
nla_map = {n.nla_type: n for n in nla_list}
|
||||
assert IflattrType.IFLA_IFNAME.value in nla_map
|
||||
assert nla_map[IflattrType.IFLA_IFNAME.value].text == "lo10"
|
||||
assert IflattrType.IFLA_NEW_IFINDEX.value in nla_map
|
||||
assert nla_map[IflattrType.IFLA_NEW_IFINDEX.value].u32 > 0
|
||||
|
||||
lo_msg = self.get_interface_byname("lo10")
|
||||
assert (
|
||||
lo_msg.base_hdr.ifi_index == nla_map[IflattrType.IFLA_NEW_IFINDEX.value].u32
|
||||
)
|
||||
|
||||
@pytest.mark.require_user("root")
|
||||
def test_create_iface_attrs(self):
|
||||
"""Tests interface creation with additional properties"""
|
||||
|
|
Loading…
Reference in a new issue