From 25c71c75ac87508528db053b818944f3650dd7a6 Mon Sep 17 00:00:00 2001 From: stephen hemminger Date: Tue, 13 Nov 2012 07:53:05 +0000 Subject: [PATCH] bridge: bridge port parameters over netlink Expose bridge port parameter over netlink. By switching to a nested message, this can be used for other bridge parameters. This changes IFLA_PROTINFO attribute from one byte to a full nested set of attributes. This is safe for application interface because the old message used IFLA_PROTINFO and new one uses IFLA_PROTINFO | NLA_F_NESTED. The code adapts to old format requests, and therefore stays compatible with user mode RSTP daemon. Since the type field for nested and unnested attributes are different, and the old code in libnetlink doesn't do the mask, it is also safe to use with old versions of bridge monitor command. Note: although mode is only a boolean, treating it as a full byte since in the future someone will probably want to add more values (like macvlan has). Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- include/uapi/linux/if_link.h | 15 ++++ net/bridge/br_netlink.c | 165 ++++++++++++++++++++++++++++------- 2 files changed, 147 insertions(+), 33 deletions(-) diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index 5c80cb11518b..96f7cf49367b 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -205,6 +205,21 @@ enum { #define IFLA_INET6_MAX (__IFLA_INET6_MAX - 1) +enum { + BRIDGE_MODE_UNSPEC, + BRIDGE_MODE_HAIRPIN, +}; + +enum { + IFLA_BRPORT_UNSPEC, + IFLA_BRPORT_STATE, /* Spanning tree state */ + IFLA_BRPORT_PRIORITY, /* " priority */ + IFLA_BRPORT_COST, /* " cost */ + IFLA_BRPORT_MODE, /* mode (hairpin) */ + __IFLA_BRPORT_MAX +}; +#define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1) + struct ifla_cacheinfo { __u32 max_reasm_len; __u32 tstamp; /* ipv6InterfaceTable updated timestamp */ diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index 14b065cbd214..0188a2f706c4 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -20,16 +20,39 @@ #include "br_private.h" #include "br_private_stp.h" +static inline size_t br_port_info_size(void) +{ + return nla_total_size(1) /* IFLA_BRPORT_STATE */ + + nla_total_size(2) /* IFLA_BRPORT_PRIORITY */ + + nla_total_size(4) /* IFLA_BRPORT_COST */ + + nla_total_size(1) /* IFLA_BRPORT_MODE */ + + 0; +} + static inline size_t br_nlmsg_size(void) { return NLMSG_ALIGN(sizeof(struct ifinfomsg)) - + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ - + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ - + nla_total_size(4) /* IFLA_MASTER */ - + nla_total_size(4) /* IFLA_MTU */ - + nla_total_size(4) /* IFLA_LINK */ - + nla_total_size(1) /* IFLA_OPERSTATE */ - + nla_total_size(1); /* IFLA_PROTINFO */ + + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ + + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ + + nla_total_size(4) /* IFLA_MASTER */ + + nla_total_size(4) /* IFLA_MTU */ + + nla_total_size(4) /* IFLA_LINK */ + + nla_total_size(1) /* IFLA_OPERSTATE */ + + nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */ +} + +static int br_port_fill_attrs(struct sk_buff *skb, + const struct net_bridge_port *p) +{ + u8 mode = !!(p->flags & BR_HAIRPIN_MODE); + + if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) || + nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) || + nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) || + nla_put_u8(skb, IFLA_BRPORT_MODE, mode)) + return -EMSGSIZE; + + return 0; } /* @@ -67,10 +90,18 @@ static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *por (dev->addr_len && nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || (dev->ifindex != dev->iflink && - nla_put_u32(skb, IFLA_LINK, dev->iflink)) || - (event == RTM_NEWLINK && - nla_put_u8(skb, IFLA_PROTINFO, port->state))) + nla_put_u32(skb, IFLA_LINK, dev->iflink))) goto nla_put_failure; + + if (event == RTM_NEWLINK) { + struct nlattr *nest + = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); + + if (nest == NULL || br_port_fill_attrs(skb, port) < 0) + goto nla_put_failure; + nla_nest_end(skb, nest); + } + return nlmsg_end(skb, nlh); nla_put_failure: @@ -126,47 +157,115 @@ out: return err; } -/* - * Change state of port (ie from forwarding to blocking etc) - * Used by spanning tree in user space. - */ +static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = { + [IFLA_BRPORT_STATE] = { .type = NLA_U8 }, + [IFLA_BRPORT_COST] = { .type = NLA_U32 }, + [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 }, + [IFLA_BRPORT_MODE] = { .type = NLA_U8 }, +}; + +/* Change the state of the port and notify spanning tree */ +static int br_set_port_state(struct net_bridge_port *p, u8 state) +{ + if (state > BR_STATE_BLOCKING) + return -EINVAL; + + /* if kernel STP is running, don't allow changes */ + if (p->br->stp_enabled == BR_KERNEL_STP) + return -EBUSY; + + if (!netif_running(p->dev) || + (!netif_carrier_ok(p->dev) && state != BR_STATE_DISABLED)) + return -ENETDOWN; + + p->state = state; + br_log_state(p); + br_port_state_selection(p->br); + return 0; +} + +/* Set/clear or port flags based on attribute */ +static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[], + int attrtype, unsigned long mask) +{ + if (tb[attrtype]) { + u8 flag = nla_get_u8(tb[attrtype]); + if (flag) + p->flags |= mask; + else + p->flags &= ~mask; + } +} + +/* Process bridge protocol info on port */ +static int br_setport(struct net_bridge_port *p, struct nlattr *tb[]) +{ + int err; + + br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE); + + if (tb[IFLA_BRPORT_COST]) { + err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST])); + if (err) + return err; + } + + if (tb[IFLA_BRPORT_PRIORITY]) { + err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY])); + if (err) + return err; + } + + if (tb[IFLA_BRPORT_STATE]) { + err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE])); + if (err) + return err; + } + return 0; +} + +/* Change state and parameters on port. */ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh) { struct ifinfomsg *ifm; struct nlattr *protinfo; struct net_bridge_port *p; - u8 new_state; + struct nlattr *tb[IFLA_BRPORT_MAX]; + int err; ifm = nlmsg_data(nlh); protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); - if (!protinfo || nla_len(protinfo) < sizeof(u8)) - return -EINVAL; - - new_state = nla_get_u8(protinfo); - if (new_state > BR_STATE_BLOCKING) - return -EINVAL; + if (!protinfo) + return 0; p = br_port_get_rtnl(dev); if (!p) return -EINVAL; - /* if kernel STP is running, don't allow changes */ - if (p->br->stp_enabled == BR_KERNEL_STP) - return -EBUSY; + if (protinfo->nla_type & NLA_F_NESTED) { + err = nla_parse_nested(tb, IFLA_BRPORT_MAX, + protinfo, ifla_brport_policy); + if (err) + return err; - if (!netif_running(dev) || - (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) - return -ENETDOWN; + spin_lock_bh(&p->br->lock); + err = br_setport(p, tb); + spin_unlock_bh(&p->br->lock); + } else { + /* Binary compatability with old RSTP */ + if (nla_len(protinfo) < sizeof(u8)) + return -EINVAL; - p->state = new_state; - br_log_state(p); + spin_lock_bh(&p->br->lock); + err = br_set_port_state(p, nla_get_u8(protinfo)); + spin_unlock_bh(&p->br->lock); + } - spin_lock_bh(&p->br->lock); - br_port_state_selection(p->br); - spin_unlock_bh(&p->br->lock); + if (err == 0) + br_ifinfo_notify(RTM_NEWLINK, p); - return 0; + return err; } static int br_validate(struct nlattr *tb[], struct nlattr *data[]) -- 2.20.1