git: 14601708d59b - stable/12 - ng_pppoe: MFC: introduce new sysctl net.graph.pppoe.lcp_pcp
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Date: Mon, 16 May 2022 03:12:50 UTC
The branch stable/12 has been updated by eugen: URL: https://cgit.FreeBSD.org/src/commit/?id=14601708d59b97ab8cd834cd1124982ea5e7dc81 commit 14601708d59b97ab8cd834cd1124982ea5e7dc81 Author: Eugene Grosbein <eugen@FreeBSD.org> AuthorDate: 2022-05-01 16:34:08 +0000 Commit: Eugene Grosbein <eugen@FreeBSD.org> CommitDate: 2022-05-16 03:11:26 +0000 ng_pppoe: MFC: introduce new sysctl net.graph.pppoe.lcp_pcp New sysctl allows to mark transmitted PPPoE LCP Control ethernet frames with needed 3-bit Priority Code Point (PCP) value. Confirming driver like if_vlan(4) uses the value to fill IEEE 802.1p class of service field. This is similar to Cisco IOS "control-packets vlan cos priority" command. It helps to avoid premature disconnection of user sessions due to control frame drops (LCP Echo etc.) if network infrastructure has a botteleck at a switch or the xdsl DSLAM. See also: https://sourceforge.net/p/mpd/discussion/44692/thread/c7abe70e3a/ Tested by: Klaus Fokuhl at SourceForge (cherry picked from commit 2e547442ab3822d3d7c46a68f152032ef5fe337c) (cherry picked from commit 28903f396af4b151e16ea606cda66a9244fb179f) --- share/man/man4/ng_pppoe.4 | 17 +++++++++++++++-- sys/netgraph/ng_pppoe.c | 23 +++++++++++++++++++++++ 2 files changed, 38 insertions(+), 2 deletions(-) diff --git a/share/man/man4/ng_pppoe.4 b/share/man/man4/ng_pppoe.4 index 7b0aee78a6cf..fa967832a4cb 100644 --- a/share/man/man4/ng_pppoe.4 +++ b/share/man/man4/ng_pppoe.4 @@ -35,7 +35,7 @@ .\" $FreeBSD$ .\" $Whistle: ng_pppoe.8,v 1.1 1999/01/25 23:46:27 archie Exp $ .\" -.Dd February 14, 2018 +.Dd May 1, 2022 .Dt NG_PPPOE 4 .Os .Sh NAME @@ -320,6 +320,18 @@ This node shuts down upon receipt of a control message, when all session have been disconnected or when the .Dv ethernet hook is disconnected. +.Sh SYSCTL VARIABLES +The node can mark transmitted LCP Ethernet packets (protocol 0xc021) +with 3-bit Priority Code Point (PCP) referring to IEEE 802.1p +class of service with following +.Xr sysctl 8 +variable. +.Bl -tag -width indent +.It Va net.graph.pppoe.lcp_pcp: 0..7 (default: 0) +Set it to non-zero value to be used by parent network interface driver +like +.Xr vlan 4 +.El .Sh EXAMPLES The following code uses .Dv libnetgraph @@ -556,7 +568,8 @@ setup(char *ethername, char *service, char *sessname, .Xr ng_ppp 4 , .Xr ng_socket 4 , .Xr ngctl 8 , -.Xr ppp 8 +.Xr ppp 8 , +.Xr vlan 4 .Rs .%A L. Mamakos .%A K. Lidl diff --git a/sys/netgraph/ng_pppoe.c b/sys/netgraph/ng_pppoe.c index b15208217281..f0f4cc741e3b 100644 --- a/sys/netgraph/ng_pppoe.c +++ b/sys/netgraph/ng_pppoe.c @@ -48,8 +48,14 @@ #include <sys/mbuf.h> #include <sys/malloc.h> #include <sys/errno.h> +#include <sys/epoch.h> +#include <sys/socket.h> +#include <sys/sysctl.h> #include <sys/syslog.h> #include <net/ethernet.h> +#include <net/if.h> +#include <net/if_vlan_var.h> +#include <net/vnet.h> #include <netgraph/ng_message.h> #include <netgraph/netgraph.h> @@ -63,8 +69,19 @@ static MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node"); #define M_NETGRAPH_PPPOE M_NETGRAPH #endif +/* Some PPP protocol numbers we're interested in */ +#define PROT_LCP 0xc021 + #define SIGNOFF "session closed" +VNET_DEFINE_STATIC(u_int32_t, ng_pppoe_lcp_pcp) = 0; +#define V_ng_pppoe_lcp_pcp VNET(ng_pppoe_lcp_pcp) + +SYSCTL_NODE(_net_graph, OID_AUTO, pppoe, CTLFLAG_RW, 0, "PPPoE"); +SYSCTL_UINT(_net_graph_pppoe, OID_AUTO, lcp_pcp, + CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ng_pppoe_lcp_pcp), 0, + "Set PCP for LCP"); + /* * This section contains the netgraph method declarations for the * pppoe node. These methods define the netgraph pppoe 'type'. @@ -1432,6 +1449,12 @@ ng_pppoe_rcvdata(hook_p hook, item_p item) mtod(m, u_char *)[1] == 0x03) m_adj(m, 2); } + + if (V_ng_pppoe_lcp_pcp && m->m_pkthdr.len >= 2 && + m->m_len >= 2 && (m = m_pullup(m, 2)) && + mtod(m, uint16_t *)[0] == htons(PROT_LCP)) + EVL_APPLY_PRI(m, (uint8_t)(V_ng_pppoe_lcp_pcp & 0x7)); + /* * Bang in a pre-made header, and set the length up * to be correct. Then send it to the ethernet driver.