5920cd3a41
The tx data offset of packet mmap tx ring used to be : (TPACKET2_HDRLEN - sizeof(struct sockaddr_ll)) The problem is that, with SOCK_RAW socket, the payload (14 bytes after the beginning of the user data) is misaligned. This patch allows to let the user gives an offset for it's tx data if he desires. Set sock option PACKET_TX_HAS_OFF to 1, then specify in each frame of your tx ring tp_net for SOCK_DGRAM, or tp_mac for SOCK_RAW. Signed-off-by: Paul Chavent <paul.chavent@onera.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
#ifndef __PACKET_INTERNAL_H__
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#define __PACKET_INTERNAL_H__
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struct packet_mclist {
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struct packet_mclist *next;
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int ifindex;
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int count;
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unsigned short type;
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unsigned short alen;
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unsigned char addr[MAX_ADDR_LEN];
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};
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/* kbdq - kernel block descriptor queue */
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struct tpacket_kbdq_core {
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struct pgv *pkbdq;
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unsigned int feature_req_word;
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unsigned int hdrlen;
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unsigned char reset_pending_on_curr_blk;
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unsigned char delete_blk_timer;
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unsigned short kactive_blk_num;
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unsigned short blk_sizeof_priv;
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/* last_kactive_blk_num:
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* trick to see if user-space has caught up
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* in order to avoid refreshing timer when every single pkt arrives.
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*/
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unsigned short last_kactive_blk_num;
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char *pkblk_start;
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char *pkblk_end;
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int kblk_size;
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unsigned int knum_blocks;
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uint64_t knxt_seq_num;
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char *prev;
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char *nxt_offset;
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struct sk_buff *skb;
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atomic_t blk_fill_in_prog;
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/* Default is set to 8ms */
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#define DEFAULT_PRB_RETIRE_TOV (8)
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unsigned short retire_blk_tov;
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unsigned short version;
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unsigned long tov_in_jiffies;
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/* timer to retire an outstanding block */
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struct timer_list retire_blk_timer;
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};
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struct pgv {
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char *buffer;
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};
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struct packet_ring_buffer {
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struct pgv *pg_vec;
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unsigned int head;
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unsigned int frames_per_block;
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unsigned int frame_size;
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unsigned int frame_max;
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unsigned int pg_vec_order;
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unsigned int pg_vec_pages;
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unsigned int pg_vec_len;
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struct tpacket_kbdq_core prb_bdqc;
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atomic_t pending;
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};
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extern struct mutex fanout_mutex;
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#define PACKET_FANOUT_MAX 256
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struct packet_fanout {
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#ifdef CONFIG_NET_NS
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struct net *net;
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#endif
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unsigned int num_members;
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u16 id;
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u8 type;
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u8 defrag;
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atomic_t rr_cur;
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struct list_head list;
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struct sock *arr[PACKET_FANOUT_MAX];
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spinlock_t lock;
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atomic_t sk_ref;
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struct packet_type prot_hook ____cacheline_aligned_in_smp;
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};
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struct packet_sock {
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/* struct sock has to be the first member of packet_sock */
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struct sock sk;
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struct packet_fanout *fanout;
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struct tpacket_stats stats;
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union tpacket_stats_u stats_u;
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struct packet_ring_buffer rx_ring;
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struct packet_ring_buffer tx_ring;
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int copy_thresh;
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spinlock_t bind_lock;
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struct mutex pg_vec_lock;
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unsigned int running:1, /* prot_hook is attached*/
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auxdata:1,
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origdev:1,
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has_vnet_hdr:1;
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int ifindex; /* bound device */
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__be16 num;
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struct packet_mclist *mclist;
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atomic_t mapped;
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enum tpacket_versions tp_version;
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unsigned int tp_hdrlen;
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unsigned int tp_reserve;
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unsigned int tp_loss:1;
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unsigned int tp_tx_has_off:1;
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unsigned int tp_tstamp;
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struct packet_type prot_hook ____cacheline_aligned_in_smp;
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};
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static struct packet_sock *pkt_sk(struct sock *sk)
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{
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return (struct packet_sock *)sk;
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}
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#endif
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