Date: Tue, 24 Oct 2023 12:27:49 GMT From: Kristof Provost <kp@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 72b97a4e2861 - stable/14 - netlink: cope with growing requests Message-ID: <202310241227.39OCRndd070938@gitrepo.freebsd.org>
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The branch stable/14 has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=72b97a4e28617b600cc21eb51664d1e1f6e6f923 commit 72b97a4e28617b600cc21eb51664d1e1f6e6f923 Author: Kristof Provost <kp@FreeBSD.org> AuthorDate: 2023-10-16 09:48:57 +0000 Commit: Kristof Provost <kp@FreeBSD.org> CommitDate: 2023-10-24 07:45:20 +0000 netlink: cope with growing requests If a request ends up growing beyong the initially allocated space the netlink functions (such as snl_add_msg_attr_u32()) will allocate a new buffer. This invalidates the header pointer we can have received from snl_create_msg_request(). Always use the hdr returned by snl_finalize_msg(). Reviewed by: melifaro MFC after: 1 week Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D42223 (cherry picked from commit 4f8f43b06ed07e96a250855488cc531799d5b78f) --- sbin/ifconfig/af_inet.c | 6 +++--- sbin/ifconfig/af_inet6.c | 2 +- sbin/ifconfig/ifconfig_netlink.c | 6 +++--- sbin/route/route_netlink.c | 8 ++++---- sys/netlink/netlink_snl_generic.h | 2 +- tests/sys/netlink/test_snl_generic.c | 2 +- usr.sbin/arp/arp_netlink.c | 12 ++++++------ usr.sbin/ndp/ndp_netlink.c | 12 ++++++------ 8 files changed, 25 insertions(+), 25 deletions(-) diff --git a/sbin/ifconfig/af_inet.c b/sbin/ifconfig/af_inet.c index 83b605e8c4cb..bcf2a8ab0ffd 100644 --- a/sbin/ifconfig/af_inet.c +++ b/sbin/ifconfig/af_inet.c @@ -360,7 +360,7 @@ in_delete_first_nl(if_ctx *ctx) ifahdr->ifa_family = AF_INET; ifahdr->ifa_index = ifindex; - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (EINVAL); nlmsg_seq = hdr->nlmsg_seq; @@ -391,7 +391,7 @@ in_delete_first_nl(if_ctx *ctx) ifahdr->ifa_index = ifindex; snl_add_msg_attr_ip4(&nw, IFA_LOCAL, &addr); - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (EINVAL); memset(&e, 0, sizeof(e)); snl_read_reply_code(ss, hdr->nlmsg_seq, &e); @@ -431,7 +431,7 @@ in_exec_nl(if_ctx *ctx, unsigned long action, void *data) snl_add_msg_attr_u32(&nw, IFAF_VHID, pdata->vhid); snl_end_attr_nested(&nw, off); - if (!snl_finalize_msg(&nw) || !snl_send_message(ctx->io_ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ctx->io_ss, hdr)) return (0); struct snl_errmsg_data e = {}; diff --git a/sbin/ifconfig/af_inet6.c b/sbin/ifconfig/af_inet6.c index a0138e9b3de6..b3da21758982 100644 --- a/sbin/ifconfig/af_inet6.c +++ b/sbin/ifconfig/af_inet6.c @@ -493,7 +493,7 @@ in6_exec_nl(if_ctx *ctx, unsigned long action, void *data) snl_add_msg_attr_u32(&nw, IFAF_VHID, pdata->vhid); snl_end_attr_nested(&nw, off); - if (!snl_finalize_msg(&nw) || !snl_send_message(ctx->io_ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ctx->io_ss, hdr)) return (0); struct snl_errmsg_data e = {}; diff --git a/sbin/ifconfig/ifconfig_netlink.c b/sbin/ifconfig/ifconfig_netlink.c index 76dd99307f31..7be340e18ab5 100644 --- a/sbin/ifconfig/ifconfig_netlink.c +++ b/sbin/ifconfig/ifconfig_netlink.c @@ -171,7 +171,7 @@ prepare_ifmap(struct snl_state *ss) hdr->nlmsg_flags |= NLM_F_DUMP; snl_reserve_msg_object(&nw, struct ifinfomsg); - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (NULL); uint32_t nlmsg_seq = hdr->nlmsg_seq; @@ -212,7 +212,7 @@ if_nametoindex_nl(struct snl_state *ss, const char *ifname) snl_reserve_msg_object(&nw, struct ifinfomsg); snl_add_msg_attr_string(&nw, IFLA_IFNAME, ifname); - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (0); hdr = snl_read_reply(ss, hdr->nlmsg_seq); @@ -234,7 +234,7 @@ prepare_ifaddrs(struct snl_state *ss, struct ifmap *ifmap) hdr->nlmsg_flags |= NLM_F_DUMP; snl_reserve_msg_object(&nw, struct ifaddrmsg); - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return; uint32_t nlmsg_seq = hdr->nlmsg_seq; diff --git a/sbin/route/route_netlink.c b/sbin/route/route_netlink.c index 0dbd90151e10..28766b062e18 100644 --- a/sbin/route/route_netlink.c +++ b/sbin/route/route_netlink.c @@ -266,7 +266,7 @@ rtmsg_nl_int(struct nl_helper *h, int cmd, int rtm_flags, int fib, int rtm_addrs if (rt_metrics->rmx_weight > 0) snl_add_msg_attr_u32(&nw, NL_RTA_WEIGHT, rt_metrics->rmx_weight); - if (snl_finalize_msg(&nw) && snl_send_message(ss, hdr)) { + if ((hdr = snl_finalize_msg(&nw)) && snl_send_message(ss, hdr)) { struct snl_errmsg_data e = {}; hdr = snl_read_reply(ss, hdr->nlmsg_seq); @@ -314,7 +314,7 @@ get_ifdata(struct nl_helper *h, uint32_t ifindex, struct snl_parsed_link_simple struct ifinfomsg *ifmsg = snl_reserve_msg_object(&nw, struct ifinfomsg); if (ifmsg != NULL) ifmsg->ifi_index = ifindex; - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return; hdr = snl_read_reply(ss, hdr->nlmsg_seq); @@ -817,7 +817,7 @@ flushroute_one(struct nl_helper *h, struct snl_parsed_route *r) snl_add_msg_attr_u32(&nw, RTA_TABLE, r->rta_table); snl_add_msg_attr_ip(&nw, RTA_DST, r->rta_dst); - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (ENOMEM); if (!snl_read_reply_code(ss, hdr->nlmsg_seq, &e)) { @@ -864,7 +864,7 @@ flushroutes_fib_nl(int fib, int af) rtm->rtm_family = af; snl_add_msg_attr_u32(&nw, RTA_TABLE, fib); - if (!snl_finalize_msg(&nw) || !snl_send_message(&ss, hdr)) { + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(&ss, hdr)) { snl_free(&ss); return (EINVAL); } diff --git a/sys/netlink/netlink_snl_generic.h b/sys/netlink/netlink_snl_generic.h index 1324cf3da17a..0a2913c9155e 100644 --- a/sys/netlink/netlink_snl_generic.h +++ b/sys/netlink/netlink_snl_generic.h @@ -106,7 +106,7 @@ snl_get_genl_family_info(struct snl_state *ss, const char *family_name, snl_init_writer(ss, &nw); hdr = snl_create_genl_msg_request(&nw, GENL_ID_CTRL, CTRL_CMD_GETFAMILY); snl_add_msg_attr_string(&nw, CTRL_ATTR_FAMILY_NAME, family_name); - if (snl_finalize_msg(&nw) == NULL || !snl_send_message(ss, hdr)) + if ((hdr = snl_finalize_msg(&nw)) == NULL || !snl_send_message(ss, hdr)) return (false); hdr = snl_read_reply(ss, hdr->nlmsg_seq); diff --git a/tests/sys/netlink/test_snl_generic.c b/tests/sys/netlink/test_snl_generic.c index f3c11daf19e1..d84d3f88f487 100644 --- a/tests/sys/netlink/test_snl_generic.c +++ b/tests/sys/netlink/test_snl_generic.c @@ -86,7 +86,7 @@ ATF_TC_BODY(test_snl_get_genl_family_groups, tc) snl_init_writer(&ss, &nw); hdr = snl_create_genl_msg_request(&nw, GENL_ID_CTRL, CTRL_CMD_GETFAMILY); snl_add_msg_attr_string(&nw, CTRL_ATTR_FAMILY_NAME, "nlctrl"); - snl_finalize_msg(&nw); + hdr = snl_finalize_msg(&nw); snl_send_message(&ss, hdr); hdr = snl_read_reply(&ss, hdr->nlmsg_seq); diff --git a/usr.sbin/arp/arp_netlink.c b/usr.sbin/arp/arp_netlink.c index 40b5367f330d..d78f380af04b 100644 --- a/usr.sbin/arp/arp_netlink.c +++ b/usr.sbin/arp/arp_netlink.c @@ -63,7 +63,7 @@ get_link_info(struct snl_state *ss, uint32_t ifindex, struct ifinfomsg *ifmsg = snl_reserve_msg_object(&nw, struct ifinfomsg); if (ifmsg != NULL) ifmsg->ifi_index = ifindex; - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (false); hdr = snl_read_reply(ss, hdr->nlmsg_seq); @@ -116,7 +116,7 @@ guess_ifindex(struct snl_state *ss, uint32_t fibnum, struct in_addr addr) snl_add_msg_attr_ip(&nw, RTA_DST, (struct sockaddr *)&dst); snl_add_msg_attr_u32(&nw, RTA_TABLE, fibnum); - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (0); hdr = snl_read_reply(ss, hdr->nlmsg_seq); @@ -148,7 +148,7 @@ guess_ifindex(struct snl_state *ss, uint32_t fibnum, struct in_addr addr) snl_add_msg_attr_u32(&nw, NHAF_TABLE, fibnum); snl_end_attr_nested(&nw, off); - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (0); hdr = snl_read_reply(ss, hdr->nlmsg_seq); @@ -285,7 +285,7 @@ print_entries_nl(uint32_t ifindex, struct in_addr addr) ndmsg->ndm_ifindex = ifindex; } - if (!snl_finalize_msg(&nw) || !snl_send_message(&ss_req, hdr)) { + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(&ss_req, hdr)) { snl_free(&ss_req); return (0); } @@ -355,7 +355,7 @@ delete_nl(uint32_t ifindex, char *host) } snl_add_msg_attr_ip(&nw, NDA_DST, (struct sockaddr *)dst); - if (!snl_finalize_msg(&nw) || !snl_send_message(&ss, hdr)) { + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(&ss, hdr)) { snl_free(&ss); return (1); } @@ -422,7 +422,7 @@ set_nl(uint32_t ifindex, struct sockaddr_in *dst, struct sockaddr_dl *sdl, char snl_end_attr_nested(&nw, off); } - if (!snl_finalize_msg(&nw) || !snl_send_message(&ss, hdr)) { + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(&ss, hdr)) { snl_free(&ss); return (1); } diff --git a/usr.sbin/ndp/ndp_netlink.c b/usr.sbin/ndp/ndp_netlink.c index 954d16995b5a..79bdec2356d0 100644 --- a/usr.sbin/ndp/ndp_netlink.c +++ b/usr.sbin/ndp/ndp_netlink.c @@ -76,7 +76,7 @@ get_link_info(struct snl_state *ss, uint32_t ifindex, struct ifinfomsg *ifmsg = snl_reserve_msg_object(&nw, struct ifinfomsg); if (ifmsg != NULL) ifmsg->ifi_index = ifindex; - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (false); hdr = snl_read_reply(ss, hdr->nlmsg_seq); @@ -152,7 +152,7 @@ guess_ifindex(struct snl_state *ss, uint32_t fibnum, const struct sockaddr_in6 * snl_add_msg_attr_ip(&nw, RTA_DST, (struct sockaddr *)dst); snl_add_msg_attr_u32(&nw, RTA_TABLE, fibnum); - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (0); hdr = snl_read_reply(ss, hdr->nlmsg_seq); @@ -184,7 +184,7 @@ guess_ifindex(struct snl_state *ss, uint32_t fibnum, const struct sockaddr_in6 * snl_add_msg_attr_u32(&nw, NHAF_TABLE, fibnum); snl_end_attr_nested(&nw, off); - if (!snl_finalize_msg(&nw) || !snl_send_message(ss, hdr)) + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr)) return (0); hdr = snl_read_reply(ss, hdr->nlmsg_seq); @@ -327,7 +327,7 @@ print_entries_nl(uint32_t ifindex, struct sockaddr_in6 *addr, bool cflag) ndmsg->ndm_ifindex = ifindex; } - if (!snl_finalize_msg(&nw) || !snl_send_message(&ss_req, hdr)) { + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(&ss_req, hdr)) { snl_free(&ss_req); return (0); } @@ -421,7 +421,7 @@ delete_nl(uint32_t ifindex, char *host) } snl_add_msg_attr_ip(&nw, NDA_DST, (struct sockaddr *)&dst); - if (!snl_finalize_msg(&nw) || !snl_send_message(&ss, hdr)) { + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(&ss, hdr)) { snl_free(&ss); return (1); } @@ -493,7 +493,7 @@ set_nl(uint32_t ifindex, struct sockaddr_in6 *dst, struct sockaddr_dl *sdl, char snl_add_msg_attr_ip(&nw, NDA_DST, (struct sockaddr *)dst); snl_add_msg_attr(&nw, NDA_LLADDR, sdl->sdl_alen, LLADDR(sdl)); - if (!snl_finalize_msg(&nw) || !snl_send_message(&ss, hdr)) { + if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(&ss, hdr)) { snl_free(&ss); return (1); }
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